U.S. patent application number 12/420559 was filed with the patent office on 2009-10-15 for mobile station device, base station device, mobile station device operating frequency band mapping method, location management device, mobile station device location registration method, paging method, and program for executing the same and recording medium.
This patent application is currently assigned to SHARP KABUSHIKI KAISHA. Invention is credited to Keiichi Hibi, Wahoh Oh, Shohei Yamada.
Application Number | 20090258647 12/420559 |
Document ID | / |
Family ID | 37906242 |
Filed Date | 2009-10-15 |
United States Patent
Application |
20090258647 |
Kind Code |
A1 |
Yamada; Shohei ; et
al. |
October 15, 2009 |
MOBILE STATION DEVICE, BASE STATION DEVICE, MOBILE STATION DEVICE
OPERATING FREQUENCY BAND MAPPING METHOD, LOCATION MANAGEMENT
DEVICE, MOBILE STATION DEVICE LOCATION REGISTRATION METHOD, PAGING
METHOD, AND PROGRAM FOR EXECUTING THE SAME AND RECORDING MEDIUM
Abstract
In a method for mapping an operating frequency band of a mobile
station device in a mobile communication system, an operating
frequency band position at the time of idle mode of respective
mobile station devices is arranged so as to be distributed
throughout a unique frequency bandwidth of a base station
device.
Inventors: |
Yamada; Shohei; (Chiba-shi,
JP) ; Oh; Wahoh; (Chiba-shi, JP) ; Hibi;
Keiichi; (Matsudo-shi, JP) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Assignee: |
SHARP KABUSHIKI KAISHA
|
Family ID: |
37906242 |
Appl. No.: |
12/420559 |
Filed: |
April 8, 2009 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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12083049 |
Apr 3, 2008 |
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PCT/JP2006/319695 |
Oct 2, 2006 |
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12420559 |
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Current U.S.
Class: |
455/435.1 ;
455/456.1; 455/458 |
Current CPC
Class: |
H04B 1/7103 20130101;
H04W 72/0453 20130101; H04B 2201/709709 20130101; H04L 5/0092
20130101; H04W 72/0406 20130101; H04W 60/00 20130101; H04W 68/025
20130101; H04B 7/2634 20130101; H04L 5/0044 20130101; H04L 5/0007
20130101; H04W 72/048 20130101; H04B 1/7143 20130101 |
Class at
Publication: |
455/435.1 ;
455/456.1; 455/458 |
International
Class: |
H04W 60/00 20090101
H04W060/00; H04W 64/00 20090101 H04W064/00; H04W 68/00 20090101
H04W068/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 4, 2005 |
JP |
2005-290707 |
Nov 2, 2005 |
JP |
2005-319363 |
Claims
1. A mobile station used in a mobile communication system, the
mobile station including at least identification information of the
mobile station and information indicating an available frequency
bandwidth of the mobile station in a location registration request
transmitted at the time of location registration of the mobile
station.
2. A location management device used in a mobile communication
system, the location management device receiving a location
registration request from a mobile station to manage a position of
the mobile station, the location management device managing at
least identification information of the mobile station and
available frequency bandwidth information of the mobile
station.
3. A mobile station used in a mobile communication system, the
mobile station including at least identification information of the
mobile station and information indicating an operating frequency
position of the mobile station in a location registration request
transmitted at the time of location registration of the mobile
station.
4. A location management device used in a mobile communication
system, the location management device receiving a location
registration request from a mobile station to manage a position of
the mobile station, the location management device managing at
least identification information of the mobile station and the
operating frequency position information of the mobile station.
5. A location management device used in a mobile communication
system, the location management device transmitting a paging
request to a base station if an incoming call to a mobile station
exists, the location management device including at least
identification information of the mobile station and information
indicating an available frequency bandwidth of the mobile station
in the paging request.
6. A base station used in a mobile communication system, when
receiving a paging request to a mobile station, the base station
transmitting the paging request at an operating frequency position
calculated at least from identification information of the mobile
station and an available frequency bandwidth of the mobile station
included in the paging request.
7. A mobile station used in a mobile communication system, the
mobile station receiving a paging request at an operating frequency
position calculated at least from identification information of the
mobile station and an available frequency bandwidth of the mobile
station.
8. A location management device used in a mobile communication
system, the location management device transmitting a paging
request to a base station if an incoming call to a mobile station
exists, the location management device including at least
identification information of the mobile station and information
indicating an operating frequency band position of the mobile
station in the paging request.
9. A base station used in a mobile communication system, when
receiving a paging request to a mobile station, the base station
transmitting the paging request at an operating frequency band
position of the mobile station included in the paging request.
10. A location registration method of a mobile station in a mobile
communication system, wherein a location registration request
transmitted by the mobile station at the time of location
registration of the mobile station includes at least identification
information of the mobile station and information indicating an
available frequency bandwidth of the mobile station.
11. A location registration method of a mobile station in a mobile
communication system, wherein a location management device
receiving a location registration request from the mobile station
to manage a location of the mobile station manages at least
identification information of the mobile station and available
frequency bandwidth information of the mobile station.
12. A location registration method of a mobile station in a mobile
communication system, wherein a location registration request
transmitted by the mobile station at the time of location
registration of the mobile station includes at least identification
information of the mobile station and information indicating an
operating frequency position of the mobile station.
13. A location registration method of a mobile station in a mobile
communication system, wherein a location management device
receiving a location registration request from a mobile station to
manage a location of the mobile station manages at least
identification information of the mobile station and the operating
frequency position information of the mobile station.
14. A paging method in a mobile communication system, wherein a
location management device transmitting a paging request to a base
station in the case of an incoming call to a mobile station
includes at least identification information of the mobile station
and information indicating an available frequency bandwidth of the
mobile station in the paging request.
15. A paging method in a mobile communication system, wherein when
receiving a paging request to a mobile station, a base station
transmits the paging request at an operating frequency position
calculated at least from identification information of the mobile
station and an available frequency bandwidth of the mobile station
included in the paging request.
16. A paging method of a mobile station in a mobile communication
system, wherein the mobile station receives a paging request at an
operating frequency position calculated at least from
identification information of the mobile station and an available
frequency bandwidth of the mobile station.
17. A paging method in a mobile communication system, wherein a
location management device transmitting a paging request to a base
station in the case of an incoming call to a mobile station
includes at least identification information of the mobile station
and information indicating an operating frequency band position of
the mobile station in the paging request.
18. A paging method in a mobile communication system, wherein when
receiving a paging request to a mobile station, a base station
transmits the paging request at an operating frequency band
position of the mobile station included in the paging request.
Description
[0001] This application is a Divisional of co-pending application
Ser. No. 12/083,049, filed on Apr. 3, 2008, the entire contents of
which are hereby incorporated by reference and for which priority
is claimed under 35 U.S.C. .sctn. 120.
TECHNICAL FIELD
[0002] The present invention relates to a mobile station device, a
base station device, a mobile station device operating frequency
band mapping method, and a program for executing the method and a
recording medium, and more particularly, to a technology of
specifying operating frequency band positions adapted to mobile
station devices in a mobile communication system with mobile
station devices at different frequency bandwidth Bn (e.g., Bn=1.25
MHz, 2.5 MHz, 5 MHz, 10 MHz, 20 MHz) mobile station classes and a
base station device, and mobile station devices location
registration and paging technologies adapted to a location
information management device that manages location information of
the mobile station devices.
BACKGROUND OF THE INVENTION
[0003] In 3GPP (3rd Generation Partnership Project), W-CDMA
(Wideband Code Division Multiple Access) mode is standardized as a
third-generation cellular mobile communication mode and the service
is sequentially started (see, e.g., non-patent document 1). One
CDMA mode is a spread spectrum mode of FDD with 5-MHz radio
frequency bandwidth, and radio physical channels are differentiated
by spread codes and code-multiplexed for transmission in the same
radio frequency bandwidth.
[0004] The W-CDMA mode includes a radio link from the mobile
station to the base station (hereinafter, uplink) and a radio link
from the base station to the mobile station (hereinafter,
downlink). The uplink and the downlink include logical channels
(Logical Channel) at SAP (Service Access point) between a layer 3
and a layer 2, transport channels (Transport Channel) for providing
service from a layer 1 to the layer 2, and physical channels
(Physical Channel) defined as a transmission channel between radio
nodes (base station and mobile station) of the layer 1 for
implementing transmission through the transport channel with the
use of an actual radio transmission path (see, e.g., non-patent
document 2).
[0005] The physical channels of the downlink of the W-CDMA are a
common pilot channel CPICH (Common Pilot Channel), a
synchronization channel SCH (Synchronisation Channel), a paging
indicator channel PICH (Paging Indicator Channel), a primary common
control physical channel P-CCPCH (Primary Common Control Physical
Channel), a secondary common control physical channel S-CCPCH
(Secondary Common Control Physical Channel), a downlink dedicated
physical data channel DPDCH (Dedicated Physical Data Channel), a
downlink dedicated physical control channel DPCCH (Dedicated
Physical Control Channel), an acquisition indicator channel AICH
(Acquisition Indicat Channel), etc.
[0006] The physical channels of the uplink of the W-CDMA are a
physical random access channel PRACH (Physical Random Access
Channel), an uplink dedicated physical data channel DPDCH, and an
uplink dedicated physical control channel DPCCH.
[0007] In the downlink of the W-CDMA, the primary common control
physical channel P-CCPCH includes a broadcast channel BCH
(Broadcast Channel) of the transport channel, and the secondary
common control physical channel S-CCPCH includes a forward access
channel FACH (Forward Access Channel) and a paging channel PCH
(Paging Channel). The downlink dedicated physical data channel
DPDCH includes a downlink dedicated channel DCH (Dedicated Channel)
of the transport channel.
[0008] In the uplink of the W-CDMA, the physical random access
channel PRACH includes a random access channel RACH (Random Access
Channel) of the transport channel, and the uplink dedicated
physical data channel DPDCH includes an uplink dedicated channel
DCH (Dedicated Channel).
[0009] A high-speed downlink packet wireless access HSDPA (High
Speed Downlink Packet Access) (non-patent document 3) mode is
standardized that applies the downlink of the W-CDMA mode to
high-speed packet communication.
[0010] The downlink physical channels of the HSDPA mode are a
high-speed physical downlink shared channel HS-PDSCH (High Speed
Physical Downlink Shared Channel) and an HS-DSCH-related shared
control channel HS-SCCH (HS-DSCH-related Shared Control
Channel).
[0011] The uplink physical channels of the HSDPA mode includes an
HS-DSCH-related uplink dedicated physical control channel HS-DPCCH
(Dedicated Physical Control Channel for HS-DSCH).
[0012] In the downlink of the HSDPA, the high-speed physical
downlink shared channel HS-PDSCH includes a high-speed downlink
shared channel HS-DSCH (High Speed Downlink Shared Channel) of the
transport channel.
[0013] The outline of the major physical channels and transport
channels of the W-CDMA will then briefly be described.
[0014] The common pilot channel CPICH is a downlink common channel
existing in each cell and is mainly used for propagation path
status estimation (Channel Estimation) of downlink channels, cell
selection for mobile stations (Cell Search), and timing reference
of other downlink physical channels in the same cell, etc.
[0015] The synchronization channel SCH is a downlink common channel
existing in each cell and is used in the initial stage of the
mobile-station cell search.
[0016] The paging indicator channel PICH is a downlink common
channel forming a pair with a paging channel PCH (Paging Channel)
of the transport channel corresponding to the secondary common
control physical channel S-CCPCH having a paging signal mapped
thereon and transmits the presence or absence of voice-call (CS:
Circuit Switch) or packet-call (PS: Packet switch) incoming-call
information for incoming call groups that are groups of mobile
stations. When a mobile station belonging to an incoming call group
#n is notified of the presence of an incoming call for the incoming
call group #n through the paging indicator channel PICH, the mobile
station receives the paging channel PCH in the corresponding radio
frame mapped on the secondary common control physical channel
S-CCPCH to determine the presence or absence of the incoming
call.
[0017] The paging indicator channel PICH is a channel set with the
aim of reducing a discontinuous reception IR (Intermittent
Reception) rate for improving battery saving in the mobile
stations. The paging indicator channel PICH transmits a short
paging indicator PI (Paging Indicator) for notifying the mobile
stations of the presence or absence of an incoming call to the
mobile stations belonging to the incoming call group #n and the
mobile stations normally receive only the paging indicator PI in a
standby state (idle mode). Only when the mobile station is notified
of the presence of an incoming call through the paging indicator
PI, the mobile station receives the paging channel PCH
corresponding to the paging indicator PI.
[0018] Since the paging indicator PI is allocated to a plurality of
the incoming call groups #n and a reception frequency per incoming
call group #n can extremely be lowered, the mobile station in the
standby state (idle mode) may receive only the short paging
indicator PI, which can extremely reduce the frequency of receiving
the paging signal of the long paging channel PCH (having a large
amount of information).
[0019] The primary common control physical channel P-CCPCH is a
downlink common channel existing in each cell and has a broadcast
channel BCH (Broadcast Channel) of the transport channel mapped
thereon to transmit broadcast information such as system
information and cell information.
[0020] The secondary common control physical channel S-CCPCH is a
downlink common channel and a plurality of these channels can exist
in each cell. The forward access channel FACH (Forward Access
Channel) and the paging channel PCH (Paging Channel) are mapped
thereon, which are the transport channels. The forward access
channel FACH is a downlink common channel and is used for
transmitting control information and user data. The forward access
channel FACH is shared and used by a plurality of mobile stations
and is used for low-rate data transmission from a higher-level
layer.
[0021] The paging channel PCH is a downlink common channel forming
a pair with the paging indicator channel PICH as above and is used
for transmitting the paging signal. The paging signal includes
messages such as a mobile station ID (UE identity), a core network
ID (CN identity), and a Paging case (Paging cause).
[0022] With regard to the downlink/uplink dedicated physical data
channels DPDCH and the downlink/uplink dedicated physical control
channels DPCCH, the downlink dedicated physical data channel DPDCH
and the downlink dedicated physical control channel DPCCH are
time-multiplexed in a time slot in the case of the downlink, and
the uplink dedicated physical data channel DPDCH and the uplink
dedicated physical control channel DPCCH are mapped to I-phase and
Q-phase, respectively, in the case of the uplink. One or more
downlink/uplink dedicated physical data channels DPDCH are
allocated to a mobile station (spread code multiplexing) and used
for the data transmission from a higher-level layer. Only one
downlink/uplink dedicated physical control channel DPCCH is
allocated to a mobile station and used for the physical layer
control.
[0023] The acquisition indicator channel AICH is a downlink common
channel forming a pair with the physical random access channel
PRACH. The acquisition indicator channel AICH is used for the
random access control of the physical random access channel
PRACH.
[0024] The physical random access channel PRACH is an uplink common
channel and has mapped thereon the random access channel RACH that
is the transport channel. Random access is applied to use this
channel for sending control information at the time of
transmission. This channel is also used for data transmission
(mainly at lower rate) from a higher-level layer.
[0025] The outline of the major physical channels and transport
channels of the HSDPA mode will then briefly be described.
[0026] The high-speed physical downlink shared channel HS-PDSCH of
the HSDPA mode is a downlink shared channel shared by a plurality
of mobile stations and includes a high-speed downlink shared
channel HS-DSCH (High Speed Downlink Shared Channel) of the
transport channel for each mobile station. The HS-PDSH is used for
transmitting packet data addressed to the mobile stations from a
higher-level layer.
[0027] The HS-DSCH-related shared control channel HS-SCCH of the
HSDPA mode is a downlink shared channel shared by a plurality of
mobile stations and transmits to the mobile stations the
information necessary for demodulating the high-speed downlink
shared channel HS-DSCH (modulation mode, spread code) and the
information necessary for error correction decoding process and a
hybrid automatic repeat request HARQ (Hybrid Automatic Repeat
reQuest).
[0028] The HS-DSCH-related uplink dedicated physical control
channel HS-DPCCH is an uplink dedicated control channel and is used
for transmitting downlink quality information CQI (Channel Quality
Indication) representing a downlink radio propagation path status
and ACK/NACK (Acknowledgement/Negative Acknowledgements) that is
reception acknowledgement information corresponding to the hybrid
automatic repeat request HARQ.
[0029] On the other hand, the evolution of the third generation
radio access (Evolved Universal Terrestrial Radio Access,
hereinafter, EUTRA) and the evolution of the third generation radio
access network (Evolved Universal Terrestrial Radio Access Network,
hereinafter, EUTRAN) are explored. The OFDM (Orthogonal Frequency
Division Multiplexing) mode is proposed for the downlink of the
EUTRA. The EUTRA technology applied to the OFDM mode is a
technology such as adaptive modulation/demodulation error
correction mode (AMCS: Adaptive Modulation and Coding Scheme,
hereinafter, AMCS mode) based on adaptive radio link control (link
adaptation) such as channel coding.
[0030] The AMCS mode is a mode of switching radio transmission
parameters (hereinafter, AMC mode) such as an error correction
mode, an encoding rate of error correction, a data modulation
multi-valued number, a code spreading rate (SF: Spreading Factor)
of time/frequency axes, and a multi-code multiplexing number
depending on the propagation path statuses of the mobile stations
to efficiently perform high-speed packet data transmission. For
example, with regard to data modulation, the maximum throughput of
a communication system can be increased by switching to the
multi-valued modulation with higher efficiency such as from the
QPSK (Quadrature Phase Shift Keying) to the 8-PSK modulation and
the 16-QAM (Quadrature Amplitude Modulation) modulation as the
propagation path status is improved.
[0031] With regard to disposition of the downlink physical channels
and the transport channels in the OFDM mode, a method of
multiplexing the physical control channel and the physical data
channel in the same frequency band through the spread code
multiplexing is proposed for the Spread-OFDM mode (see, e.g.,
patent document 1). In a method proposed for the Non Spread-OFDM
mode (e.g., wireless LAN standard 802.16), the resources of the
frequency axis (sub-carrier) and the time axis (OFDM symbol) of the
OFDM are used to multiplex the channels in time/frequency through
the time division multiplexing TDM (Time Division Multiplexing),
the frequency division multiplexing FDM (Frequency Division
Multiplexing), or a combination of TDM/FDM.
[0032] The technical requirements of the EUTRA/EUTRAN are proposed
(see, e.g., non-patent document 4), which request spectrum
flexibility for integration and coexistence with existing 2G and 3G
services and request support for spectrum allocations to different
size spectrum (frequency bandwidth, e.g., 1.25 MHz, 2.5 MHz, 5 MHz,
10 MHz, 20 MHz).
[0033] The technical information of the EUTRA is proposed (see
non-patent document 5), which shows a method of frequency band
position specification (center-frequency shifting) to be used for a
mobile station capable of transmission/reception in different
frequency bandwidths. Description will be made with reference to
FIG. 37. When a base station supports a unique maximum frequency
bandwidth, for example, a frequency bandwidth of 20 MHz and a
mobile station supports a unique maximum frequency bandwidth, for
example, a bandwidth of 5 MHz, the mobile station first uses the
downlink synchronization channel DSNCH and the downlink pilot
channel DPCH to perform cell search. Hereinafter, a group of mobile
stations capable of transmission/reception in different frequency
bandwidths, for example, Bn frequency bandwidths (Bn=1.25, 2.5, 5,
10, 15, and 20 MHz) is defined as a Bn mobile station class; a
mobile station capable of transmission/reception in the Bn
frequency bandwidth is defined as a mobile station of the Bn mobile
station class; and a transmission/reception frequency bandwidth Bn
of the mobile station defined by the Bn mobile station class is
defined as a unique frequency bandwidth Bn of the mobile
station.
[0034] Specifically, the mobile station detects a downlink
synchronization channel DSNCH at 5 MHz, which is the center of the
20-MHz bandwidth, and then receives a downlink common control
channel DCCCH. The downlink common control channel DCCCH includes
transmission bandwidth information and frequency shift information
for specifying frequency band positions to be used by respective
mobile stations in different mobile station classes. The mobile
station moves to the operating frequency band position in
accordance with the control information to start data transfer. The
downlink channels DSNCH and DCCCH will be described later.
[0035] As above, in the 3GPP (3rd Generation Partnership Project),
the W-CDMA (Wideband Code Division Multiple Access) mode is
standardized as the third generation cellular mobile communication
mode and the service is sequentially started (see, e.g., non-patent
document 1).
[0036] In the conventional mobile communication systems such as GSM
(Global System for Mobile Communications) or W-CDMA, subscriber
identifiers IMSI (International Mobile Subscriber Identity) are
used for mobility management. The core network of the W-CDMA mode
is configured based on the core network of the GSM. The movement
managing method of the W-CDMA mode will be described with reference
to FIG. 38.
[0037] An RNC (Radio Network Controller) (50) is a radio
controlling device and a controlling device managing radio
resources and controlling Nodes B (10). The RNC (50) controls
handover, for example.
[0038] The Node B (10) is a logical node performing radio
transmission/reception and is specifically a radio base station
device. The Node B (10) is connected to a mobile station device 20
through a radio interface.
[0039] An SGSN (Serving GPRS Support Node) (30) is a control node
for the packet switched service of the core network and includes a
VLR (Visitor Location Register) (31) that manages subscriber
information of visited subscribers.
[0040] Attach is mainly performed at the time of power-on of a
mobile station 20. In a procedure for managing whether a terminal
can receive an incoming call, an incoming call can be received in
the attached state and an incoming call cannot be received in the
detached state.
[0041] Location registration is performed if the mobile station
moves a location registration area 40, and the subscriber
information is downloaded from an HLR (Home Location Register) not
shown in the procedure to the visited VLR (31).
[0042] The attach and the location registration process can
concurrently be executed. When detecting a change in the location
registration area 40 from broadcast information, the mobile station
20 makes a location registration request including a subscriber
identifier IMSI to the VLR (31) of the SGSN (30) through the Node B
(10) and the RNC (50). The VLR (31) downloads and allocates the
subscriber information from the HLR as a temporary subscriber
identifier to a TMSI (Temporary Mobile Subscriber Identity) and
transmits a response message of the location registration to the
mobile station 20.
[0043] Since the TMSI is used for identifying users over the air,
security can be improved by hiding the IMSI as compared to the case
of using the IMSI, and since the TMSI is used which has about half
amount of information relative to the IMSI, an information amount
can be reduced over the air.
[0044] A process procedure of paging will then be described with
reference to FIG. 39. In mobile communication, if an incoming call
exists for the mobile station 20, the mobile station 20 must be
notified of the presence of the incoming call. The location
information of the mobile station 20 is managed through the
location registration area 40 in the network, and all the mobile
stations are notified of the presence of the incoming call in a
broadcasting manner in the location registration area 40 where the
location of the mobile station 20 is registered. This procedure is
referred to as paging.
[0045] The paging is performed by sending a paging request signal
from the VLR (31) to all the RNC (50) containing the location
registration area 40 registered in the visited VLR (31). Using the
TMSI for the subscriber identifier in this case is advantageous as
above from a viewpoint of security and signal amount as compared to
the case of using the IMSI.
[0046] Since the mobile station 20 always monitors a channel for
call-out in the case of the idle mode (standby state), the mobile
station 20 can recognize the paging to the own station. The mobile
station 20 returns a response to the network if the location
registration area and the TMSI (IMSI) included in the paging
request are identical to the location registration area and the
TMSI (IMSI) stored in itself.
[0047] The outline of the major physical channels and transport
channels of the W-CDMA will then briefly be described.
[0048] The paging indicator channel PICH is a downlink common
channel forming a pair with the paging channel PCH (Paging Channel)
of the transport channel corresponding to the secondary common
control physical channel S-CCPCH having a paging signal mapped
thereon. The PICH transmits the presence or absence of voice-call
(CS: Circuit Switch) or packet-call (PS: Packet Switch)
incoming-call information for incoming call groups that are groups
of mobile stations.
[0049] When a mobile station belonging to an incoming call group #n
is notified of the presence of an incoming call for the incoming
call group #n through the paging indicator channel PICH, the mobile
station receives the paging channel PCH in the corresponding radio
frame mapped on the secondary common control physical channel
S-CCPCH to determine the presence or absence of the incoming call
to itself.
[0050] The paging indicator channel PICH is a channel set with the
aim of reducing a discontinuous reception IR (Intermittent
Reception) rate for improving battery saving in the mobile
stations. The paging indicator channel PICH transmits a short
paging indicator PI (Paging Indicator) for notifying the mobile
stations of the presence or absence of an incoming call to the
mobile stations belonging to the incoming call group #n and the
mobile stations normally receive only the paging indicator PI in
the standby state (idle mode). Only when the mobile station is
notified of the presence of an incoming call through the paging
indicator PI, the mobile station receives the paging channel PCH
corresponding to the paging indicator PI.
[0051] The paging indicator PI is allocated to a plurality of the
incoming call groups #n and a reception frequency per incoming call
group #n can extremely be lowered. Therefore, the mobile station in
the standby state (idle mode) may receive only the short paging
indicator PI, which can extremely reduce the frequency of receiving
the paging signal of the long paging channel PCH (having a large
amount of information).
[0052] Patent Document 1: Japanese Laid-Open Patent Publication No.
2001-237803
[0053] Patent Document 2: Japanese Patent Application Laid-Open
Publication No. 2004-297756
[0054] Non-patent Document 1: 3GPP TS 25.211, V6.4.0 (2005-03),
Physical channels and mapping of transport channels onto physical
channels. http://www.3gpp.org/ftp/Specs/html-info/25-series.htm
[0055] Non-patent Document 2: Keiji Tachikawa, "W-CDMA Mobile
Communications System", ISBN4-621-04894-5, P103, P115, etc.
[0056] Non-patent Document 3: 3GPP TR (Technical Report) 25.858,
and 3GPP documents related to HSDPA specifications,
http://www.3gpp.org/ftp/Specs/html-info/25-series.htm
[0057] Non-patent Document 4: 3GPP TR (Technical Report) 25.913,
V2.1.0 (2005-05), Requirements for evolved Universal Terrestrial
Radio Access (UTRA) and Universal Terrestrial Radio Access Network
(UTRAN). http://www.3gpp.org/ftp/Specs/html-info/25913.htm
[0058] Non-patent Document 5: 3GPP R1-050592 NTT DoCoMo "Physical
Channel Concept for Scalable Bandwidth in Evolved UTRA
Downlink".
DISCLOSURE OF THE INVENTION
Problems to be Solved by the Invention
[0059] However, no specific idea has been proposed for contents of
transfer bandwidth information and frequency shift information for
specifying a frequency band position to be used by a mobile station
in a different mobile station class in above patent documents.
[0060] In general, it is contemplated that the control information
is exchanged between the base station and the mobile stations
through the downlink/uplink control channels and that the control
information is transmitted to a certain mobile station to specify
operating frequency band positions at the time of the idle mode and
the active mode. If the control information is exchanged before
shifting the operating frequency band position, communication is
very congested at the center frequency band of the unique frequency
bandwidth of the base station, for example, at a 5-MHz frequency
band that is the center of a 20-MHz frequency bandwidth. Since the
control information is exchanged between the base station and the
mobile stations, radio resources are used, leading to reduction in
the frequency utilization efficiency of the overall system.
Complicated base station control is also needed such as management
and storage of the operating frequency band position and avoidance
of communication congestion in some frequency bands for a certain
mobile station.
[0061] The present invention was conceived to solve the above
problems and it is therefore an object of the present invention to
provide a mobile station device, a base station device, a mobile
station device operating frequency band mapping method, and a
program for executing the method and a recording medium, which can
efficiently use radio resources through the operating frequency
bands adapted to mobile stations in different mobile station
classes (shifting of the center frequency) to improve the frequency
utilization efficiency of the overall communication system and
which can efficiently execute the base station control of the
operating frequency band for a certain mobile station.
[0062] In above patent documents, no specific idea has been
proposed for how to specify the center frequency position to shift
within the unique frequency bandwidth of the base station for
mobile stations with different frequency bandwidth abilities (e.g.,
1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 20 MHz) and how to perform the
paging for the mobile stations in the standby state at the shifted
frequency positions.
[0063] In general, it is contemplated that the control information
is exchanged between the base station and the mobile stations
through the downlink/uplink control channels and that the control
information is transmitted to a certain mobile station to specify a
position of the center frequency to which the mobile station should
be shifted. In this case, the mobile station in the idle mode must
register a shifted frequency position to the base station each time
the base station is changed and an amount of signals for control is
significantly increased.
[0064] In an existing mechanism of location registration, only the
subscriber identification information IMSI is registered in the
VLR, and no information is maintained about which is the waiting
frequency band position of the mobile station called through the
paging. Therefore, the paging indicator channel PICH and the paging
channel PCH must be prepared as in the W-CDMA mode to define the
reception at a certain frequency band position.
[0065] In this case, since the mobile station must periodically
shift the center frequency to acquire the paging indicator channel
PICH and the paging channel PCH, the process becomes complicated.
Since the base station cannot identify the shifted frequency
position of the mobile station, delivery of the scheduling
information to the mobile station becomes complicated and a longer
time is required for transition from the paging to the
communicating state.
[0066] The present invention was conceived to solve the above
problems and it is therefore an object of the present invention to
provide a mobile station device, a base station device, a location
management device, a mobile station device location registration
method, a paging method, and a program for executing the methods
and a recording medium adapted to a mobile communication system
containing mobile stations with different frequency bandwidth
abilities (e.g., 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 20 MHz).
Means for Solving the Problems
[0067] In order to solve the above problems, a first technical
means is a communication method used in a mobile communication
system composing a shared control signaling channel and a shared
data channel in one slot, wherein a packet specified by the shared
control signaling channel is arranged in the shared data channel,
wherein a base station transmits a signal indicating that paging
information to a mobile station is included in the shared data
channel, using the shared control signaling channel arranged at the
head of a slot specified from identification information of the
mobile station, and the mobile station in an idle mode receives
discontinuously the signal indicating that the paging information
to the mobile station is included in the shared data channel.
[0068] A second technical means is the communication method as
defined in the first technical means, wherein the slot number is
specified by the remainder on division of (the identification
information of the mobile station divided by the number of paging
group) by the number of paging slots.
[0069] A third technical means is a mobile station used in a mobile
communication system composing a shared control signaling channel
and a shared data channel in one slot, wherein a packet specified
by the shared control signaling channel is arranged in the shared
data channel, wherein the mobile station receives a signal from a
base station, indicating that paging information to the mobile
station is included in the shared data channel, using the shared
control signaling channel arranged at the head of a slot specified
from identification information of the mobile station, and the
mobile station in an idle mode receives discontinuously the signal
indicating that the paging information to the mobile station is
included in the shared data channel.
[0070] A fourth technical means is the mobile station as defined in
the third technical means, wherein the slot number is specified by
the remainder on division of (the identification information of the
mobile station divided by the number of paging group) by the number
of paging slots.
[0071] A fifth technical means is a base station used in a mobile
communication system composing a shared control signaling channel
and a shared data channel in one slot, wherein a packet specified
by the shared control signaling channel is arranged in the shared
data channel, wherein the base station transmits a signal
indicating that paging information to a mobile station is included
in the shared data channel, using the shared control signaling
channel arranged at the head of a slot specified from
identification information of the mobile station.
[0072] A sixth technical means is the base station as defined in
the fifth technical means, wherein the slot number is specified by
the remainder on division of (the identification information of the
mobile station divided by the number of paging group) by the number
of paging slots.
[0073] A seventh technical means is a mobile station used in a
mobile communication system, an operating frequency band position
of the mobile station being a certain frequency position calculated
at least from identification information of the mobile station.
[0074] An eighth technical means is a mobile station used in a
mobile communication system, operating frequency band positions at
the time of an idle mode of respective mobile stations being
arranged to be distributed throughout a unique frequency bandwidth
of a base station.
[0075] A ninth technical means is a mobile station used in a mobile
communication system, an operating frequency band position at the
time of an idle mode is a certain frequency position calculated at
least from identification information of the mobile station.
[0076] A tenth technical means is the mobile station as defined in
the ninth technical means, wherein the operating frequency band
position of the mobile station is identified from the operating
frequency band position at the time of the idle mode.
[0077] An eleventh technical means is the mobile station as defined
in the ninth technical means, wherein an indicator of an incoming
call to a group including the mobile station or paging information
to the mobile station is received at the operating frequency band
position at the time of the idle mode.
[0078] A twelfth technical means is the mobile station as defined
in the seventh technical means, wherein cell search information and
broadcast information transmitted from the base station are
received at the operating frequency band position.
[0079] A thirteenth technical means is the mobile station as
defined in the ninth technical means, wherein cell search
information and broadcast information transmitted from the base
station are received at the operating frequency band position at
the time of the idle mode.
[0080] A fourteenth technical means is the mobile station as
defined in the ninth technical means, wherein during a reception
period of cell search information and broadcast information
transmitted from the base station, the reception is performed at a
frequency band position other than the operating frequency band
position at the time of the idle mode.
[0081] A fifteenth technical means is the mobile station as defined
in the eighth technical means, wherein the operating frequency band
position at the time of the idle mode is also divided in the time
direction depending on the identification information.
[0082] A sixteenth technical means is the mobile station as defined
in the seventh or the ninth technical means, wherein the
identification information is used at the time of an initial
location registration process of the mobile station, and wherein
after the location registration to a higher-level network node,
temporary identification information acquired from the higher-level
network node is used.
[0083] A seventeenth technical means is the mobile station as
defined in the eleventh technical means, wherein the indicator is
located as a downlink common control channel.
[0084] An eighteenth technical means is the mobile station as
defined in the eleventh technical means, wherein the indicator is
located as a downlink shared control signaling channel.
[0085] A nineteenth technical means is the mobile station as
defined in the ninth technical means, wherein discontinuous
reception is performed at the operating frequency band position at
the time of the idle mode.
[0086] A twentieth technical means is a base station used in a
mobile communication system, an operating frequency band position
of a mobile station being a certain frequency position calculated
at least from identification information of the mobile station.
[0087] A twenty-first technical means is a base station used in a
mobile communication system, operating frequency band positions at
the time of an idle mode of respective mobile stations being
arranged to be distributed throughout a unique frequency bandwidth
of the base station.
[0088] A twenty-second technical means is a base station used in a
mobile communication system, an operating frequency band position
at the time of an idle mode is a certain frequency position
calculated at least from identification information of the mobile
station.
[0089] A twenty-third technical means is the base station as
defined in the twenty-second technical means, wherein the operating
frequency band position of the mobile station is identified from
the operating frequency band position at the time of the idle
mode.
[0090] A twenty-fourth technical means is the base station as
defined in the twenty-second technical means, wherein an indicator
of an incoming call to a group including the mobile station or
paging information to the mobile station is transmitted at the
operating frequency band position at the time of the idle mode.
[0091] A twenty-fifth technical means is the base station as
defined in the twentieth technical means, wherein cell search
information and broadcast information are transmitted at the
operating frequency band position.
[0092] A twenty-sixth technical means is the base station as
defined in the twenty-second technical means, wherein the base
station transmits cell search information and broadcast information
at the operating frequency band position at the time of the idle
mode.
[0093] A twenty-seventh technical means is the base station as
defined in the twenty-second technical means, wherein the base
station transmits cell search information and broadcast information
during a transmission period of the cell search information and the
broadcast information, at a frequency band position other than the
operating frequency band position at the time of the idle mode.
[0094] A twenty-eighth technical means is the base station as
defined in the twenty-first technical means, wherein the operating
frequency band position at the time of the idle mode is also
divided in the time direction depending on the identification
information.
[0095] A twenty-ninth technical means is the base station as
defined in the twentieth or the twenty-second technical means,
wherein the identification information is used at the time of an
initial location registration process of the mobile station, and
wherein after the location registration to a higher-level network
node, temporary identification information acquired from the
higher-level network node is used.
[0096] A thirtieth technical means is the base station as defined
in the twenty-fourth technical means, wherein the indicator is
located as a downlink common control channel.
[0097] A thirty-first technical means is the base station as
defined in the twenty-fourth technical means, wherein the indicator
is located as a downlink shared control signaling channel.
[0098] A thirty-second technical means is a mobile-station
operating frequency band mapping method for mapping an operating
frequency band of a mobile station in a mobile communication
system, wherein the operating frequency band position of the mobile
station is calculated at least from identification information for
identifying the mobile station.
[0099] A thirty-third technical means is a mobile-station operating
frequency band mapping method for mapping an operating frequency
band of a mobile station in a mobile communication system, wherein
operating frequency band positions at the time of an idle mode of
respective mobile stations are arranged to be distributed
throughout a unique frequency bandwidth of a base station.
[0100] A thirty-fourth technical means is a mobile-station
operating frequency band mapping method in a mobile communication
system, wherein at the time of an idle mode that is a standby state
of the mobile station, the operating frequency band position is
calculated at least from identification information for identifying
the mobile station.
[0101] A thirty-fifth technical means is the mobile-station
operating frequency band mapping method as defined in the
thirty-fourth technical means, wherein the operating frequency band
position of the mobile station is identified from the operating
frequency band position at the time of the idle mode.
[0102] A thirty-sixth technical means is the mobile-station
operating frequency band mapping method as defined in the
thirty-fourth technical means, wherein an indicator of an incoming
call to a group including the mobile station or paging information
to the mobile station is received at the operating frequency band
position at the time of the idle mode.
[0103] A thirty-seventh technical means is the mobile-station
operating frequency band mapping method as defined in the
thirty-second technical means, wherein cell search information and
broadcast information transmitted from the base station are
received at the operating frequency band position.
[0104] A thirty-eighth technical means is the mobile-station
operating frequency band mapping method as defined in the
thirty-fourth technical means, wherein cell search information and
broadcast information transmitted from a base station are received
at the operating frequency band position at the time of the idle
mode.
[0105] A thirty-ninth technical means is the mobile-station
operating frequency band mapping method as defined in the
thirty-fourth technical means, wherein during a reception period of
cell search information and broadcast information transmitted from
a base station, the reception is performed at a frequency band
position other than the operating frequency band position at the
time of the idle mode.
[0106] A fortieth technical means is the mobile-station operating
frequency band mapping method as defined in the thirty-third
technical means, wherein the operating frequency band position at
the time of the idle mode is also divided in the time direction
depending on identification information.
[0107] A forty-first technical means is the mobile-station
operating frequency band mapping method as defined in the
thirty-second technical means, wherein the identification
information is used at the time of an initial location registration
process of the mobile station, and wherein after the location
registration to a higher-level network node, temporary
identification information acquired from the higher-level network
node is used.
[0108] A forty-second technical means is the mobile-station
operating frequency band mapping method as defined in the
thirty-fourth technical means, wherein the identification
information is used at the time of an initial location registration
process of the mobile station, and wherein after the location
registration to a higher-level network node, temporary
identification information acquired from the higher-level network
node is used.
[0109] A forty-third technical means is the mobile-station
operating frequency band mapping method as defined in the
thirty-sixth technical means, wherein the indicator is located as a
downlink common control channel.
[0110] A forty-fourth technical means is the mobile-station
operating frequency band mapping method as defined in the
thirty-sixth technical means, wherein the indicator is located as a
downlink shared control signaling channel.
[0111] A forty-fifth technical means is the mobile-station
operating frequency band mapping method as defined in the
thirty-fourth technical means, wherein discontinuous reception is
performed at the operating frequency band position at the time of
the idle mode.
[0112] A forty-sixth technical means is the mobile-station
operating frequency band mapping method as defined in the
thirty-fourth technical means, wherein at the time of the idle
mode, broadcast information transmitted from a base station is
located at respective operating frequency band positions of the
idle mode so as to be received at the operating frequency band
position of the idle mode.
[0113] A forty-seventh technical means is a mobile station used in
a mobile communication system, the mobile station including at
least identification information of the mobile station and
information indicating an available frequency bandwidth of the
mobile station in a location registration request transmitted at
the time of location registration of the mobile station.
[0114] A forty-eighth technical means is a location management
device used in a mobile communication system, the location
management device receiving a location registration request from a
mobile station to manage a position of the mobile station, the
location management device managing at least identification
information of the mobile station and available frequency bandwidth
information of the mobile station.
[0115] A forty-ninth technical means is a mobile station used in a
mobile communication system, the mobile station including at least
identification information of the mobile station and information
indicating an operating frequency position of the mobile station in
a location registration request transmitted at the time of location
registration of the mobile station.
[0116] A fiftieth technical means is a location management device
used in a mobile communication system, the location management
device receiving a location registration request from a mobile
station to manage a position of the mobile station, the location
management device managing at least identification information of
the mobile station and the operating frequency position information
of the mobile station.
[0117] A fifty-first technical means is a location management
device used in a mobile communication system, the location
management device transmitting a paging request to a base station
if an incoming call to a mobile station exists, the location
management device including at least identification information of
the mobile station and information indicating an available
frequency bandwidth of the mobile station in the paging
request.
[0118] A fifty-second technical means is a base station used in a
mobile communication system, when receiving a paging request to a
mobile station, the base station transmitting the paging request at
an operating frequency position calculated at least from
identification information of the mobile station and an available
frequency bandwidth of the mobile station included in the paging
request.
[0119] A fifty-third technical means is a mobile station used in a
mobile communication system, the mobile station receiving a paging
request at an operating frequency position calculated at least from
identification information of the mobile station and an available
frequency bandwidth of the mobile station.
[0120] A fifty-fourth technical means is a location management
device used in a mobile communication system, the location
management device transmitting a paging request to a base station
if an incoming call to a mobile station exists, the location
management device including at least identification information of
the mobile station and information indicating an operating
frequency band position of the mobile station in the paging
request.
[0121] A fifty-fifth technical means is a base station used in a
mobile communication system, when receiving a paging request to a
mobile station, the base station transmitting the paging request at
an operating frequency band position of the mobile station included
in the paging request.
[0122] A fifty-sixth technical means is a location registration
method of a mobile station in a mobile communication system,
wherein a location registration request transmitted by the mobile
station at the time of location registration of the mobile station
includes at least identification information of the mobile station
and information indicating an available frequency bandwidth of the
mobile station.
[0123] A fifty-seventh technical means is a location registration
method of a mobile station in a mobile communication system,
wherein a location management device receiving a location
registration request from the mobile station to manage a location
of the mobile station manages at least identification information
of the mobile station and available frequency bandwidth information
of the mobile station.
[0124] A fifty-eighth technical means is a location registration
method of a mobile station in a mobile communication system,
wherein a location registration request transmitted by the mobile
station at the time of location registration of the mobile station
includes at least identification information of the mobile station
and information indicating an operating frequency position of the
mobile station.
[0125] A fifty-ninth technical means is a location registration
method of a mobile station in a mobile communication system,
wherein a location management device receiving a location
registration request from a mobile station to manage a location of
the mobile station manages at least identification information of
the mobile station and the operating frequency position information
of the mobile station.
[0126] A sixtieth technical means is a paging method in a mobile
communication system, wherein a location management device
transmitting a paging request to a base station in the case of an
incoming call to a mobile station includes at least identification
information of the mobile station and information indicating an
available frequency bandwidth of the mobile station in the paging
request.
[0127] A sixty-first technical means is a paging method in a mobile
communication system, wherein when receiving a paging request to a
mobile station, a base station transmits the paging request at an
operating frequency position calculated at least from
identification information of the mobile station and an available
frequency bandwidth of the mobile station included in the paging
request.
[0128] A sixty-second technical means is a paging method of a
mobile station in a mobile communication system, wherein the mobile
station receives a paging request at an operating frequency
position calculated at least from identification information of the
mobile station and an available frequency bandwidth of the mobile
station.
[0129] A sixty-third technical means is a paging method in a mobile
communication system, wherein a location management device
transmitting a paging request to a base station in the case of an
incoming call to a mobile station includes at least identification
information of the mobile station and information indicating an
operating frequency band position of the mobile station in the
paging request.
[0130] A sixty-fourth technical means is a paging method in a
mobile communication system, wherein when receiving a paging
request to a mobile station, a base station transmits the paging
request at an operating frequency band position of the mobile
station included in the paging request.
[0131] A sixty-fifth technical means is a program for causing a
computer to perform the mobile-station operating frequency band
mapping method as defined in any one of the thirty-second to the
forty-sixth technical means.
[0132] A sixty-sixth technical means is a program for causing a
computer to perform the location registration method of a mobile
station as defined in any one of the fifty-sixth to the fifty-ninth
technical means or the paging method as defined in any one of the
sixtieth to the sixty-fourth technical means.
[0133] A sixty-seventh technical means is a recording medium having
recorded thereon the program as defined in the sixty-fifth
technical means in a computer-readable manner.
[0134] A sixty-eighth technical means is a recording medium having
recorded thereon the program as defined in the sixty-sixth
technical means in a computer-readable manner.
EFFECT OF THE INVENTION
[0135] According to the present invention, a mobile station device,
a base station device, a mobile station device operating frequency
band mapping method, and a program for executing the method and a
recording medium are provided which can efficiently use radio
resources through the specification of the operating frequency band
positions adapted to mobile stations in different mobile station
classes to improve the frequency utilization efficiency of the
overall communication system and which can efficiently execute the
base station control of the operating frequency band position
specification for a certain mobile station.
[0136] Particularly, an effective means is provided, which is
related to the grouping of mobile stations for specifying the
operating frequency band positions of the mobile stations adapted
to different frequency bandwidths (e.g., 1.25 MHz, 2.5 MHz, 5 MHz,
10 MHz, 20 MHz) and especially to a grouping process for packet
indicator PI (Packet Indicator) information indicating the presence
or absence of a packet call corresponding to AIPN (ALL Internet
Protocol Network) requiring the EUTRA/EUTRAN.
[0137] According to the present invention, a mobile station device,
a base station device, a location management device, a mobile
station device location registration method, a paging method, and a
program for executing the methods and a recording medium are
provided which are adapted to a mobile communication system
containing mobile stations with different frequency bandwidth
abilities (e.g., 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 20 MHz).
BRIEF DESCRIPTION OF THE DRAWINGS
[0138] FIG. 1 is a view for explaining an exemplary channel
structure of the EUTRA.
[0139] FIG. 2 is a view of correlations between uplink/downlink
channels of the EUTRA and the W-CDMA/HSDPA mode assumed based on
the proposition of 3GPP.
[0140] FIG. 3 is a view of state transition of a mobile station
assumed based on the proposition of 3GPP.
[0141] FIG. 4 is a view of an exemplary structure of a downlink
radio frame assumed based on the proposition of 3GPP for the
EUTRA.
[0142] FIG. 5 is a conceptual view of discontinuous reception
operation when the mobile station is in the idle mode.
[0143] FIG. 6 is a view of another exemplary structure of the
downlink radio frame assumed based on the proposition of 3GPP for
the EUTRA.
[0144] FIG. 7 is a view of an exemplary structure of a base station
related to the present invention.
[0145] FIG. 8 is a view of an exemplary structure of a mobile
station related to the present invention.
[0146] FIG. 9 is a view for explaining a first embodiment of the
present invention.
[0147] FIG. 10 is a view for explaining location of a packet
indicator for each TTI.
[0148] FIG. 11 is a view of how the numbers are applied to
candidates for the operating frequency bands of mobile stations in
different mobile station classes when the unique frequency
bandwidths of the base station are 15 MHz, 10 MHz, 5 MHz, and 2.5
MHz.
[0149] FIG. 12 is a view for explaining a calculating method of an
operating frequency band position, an IM group, and a PI group.
[0150] FIG. 13 is another view for explaining the calculating
method of the operating frequency band position, the IM group, and
the PI group.
[0151] FIG. 14 is yet another view for explaining the calculating
method of the operating frequency band position, the IM group, and
the PI group.
[0152] FIG. 15 is a view of an example of structuring the operating
frequency bands in an overlapped manner.
[0153] FIG. 16 is a flowchart for explaining a process when the
mobile station is powered on and transits to the idle mode.
[0154] FIG. 17 is a view for explaining a process when the mobile
station is powered on and transits to the idle mode.
[0155] FIG. 18 is a view for explaining an exemplary structure of a
downlink radio frame.
[0156] FIG. 19 is a view for explaining another exemplary structure
of the downlink radio frame.
[0157] FIG. 20 is a view for explaining yet another exemplary
structure of the downlink radio frame.
[0158] FIG. 21 is a view for explaining yet another exemplary
structure of the downlink radio frame.
[0159] FIG. 22 is a flowchart for explaining a process at the time
of the idle mode.
[0160] FIG. 23 is a view for explaining a process at the time of
the idle mode.
[0161] FIG. 24 is a flowchart for explaining a control process for
an incoming packet.
[0162] FIG. 25 is a view for explaining a control process for an
incoming packet.
[0163] FIG. 26 is a flowchart for explaining a control process at
the time of packet transmission.
[0164] FIG. 27 is a view for explaining a control process at the
time of packet transmission.
[0165] FIG. 28 is a view of yet another exemplary structure of the
downlink radio frame of the present invention.
[0166] FIG. 29 is a view of yet another exemplary structure of the
downlink radio frame of the present invention.
[0167] FIG. 30 is a view of yet another exemplary structure of the
downlink radio frame of the present invention.
[0168] FIG. 31 is a view of respective exemplary structures of a
base station, a mobile station, and a location management
device.
[0169] FIG. 32 is a view for explaining one embodiment of the
present invention.
[0170] FIG. 33 is another view for explaining one embodiment of the
present invention.
[0171] FIG. 34 is a view of explaining a numbering method of
identifying the operating frequency band position of the mobile
station used at the time of location registration and the time of
paging.
[0172] FIG. 35 is a view for explaining an example of a procedure
of location registration according to the present invention.
[0173] FIG. 36 is a view for explaining a procedure of paging
according to the present invention.
[0174] FIG. 37 is a view for explaining an example of a
conventional method of specifying the operating frequency band
position.
[0175] FIG. 38 is a view for explaining a movement management
method of the W-CDMA mode.
[0176] FIG. 39 is a view for explaining an example of a process
procedure of paging.
EXPLANATION OF REFERENCE NUMERALS
[0177] 10 . . . Node B; 20 . . . mobile station; 30 . . . SGSN; 31
. . . VLR, 40 . . . location registration area, 50 . . . RNC; 100 .
. . base station; 101 . . . antenna portion; 102 . . . radio
portion; 103 . . . demodulating portion; 104 . . . link channel
estimating portion; 105 . . . control data extracting portion; 106
. . . channel decoding portion; 107 . . . channel coding portion;
108 . . . control data inserting portion; 109 . . . OFDM modulating
portion; 110 . . . scheduling portion; 111 . . . antenna portion;
112 . . . radio portion; 113 . . . control portion; 114 . . .
communication IF; 200 . . . mobile station; 201 . . . antenna
portion; 202 . . . radio portion; 203 . . . OFDM demodulating
portion; 204 . . . link channel estimating portion; 205 . . .
control data extracting portion; 206 . . . channel decoding
portion; 207 . . . channel coding portion; 208 . . . control data
inserting portion; 209 . . . modulating portion; 210 . . . control
portion; 211 . . . antenna portion; 212 . . . radio portion; 213 .
. . control portion; 300 . . . location management device; 301 . .
. location management database; 302 . . . control portion; 303 . .
. communication IF; and 400 . . . location registration area.
PREFERRED EMBODIMENTS OF THE INVENTION
[0178] FIG. 1 is a view for explaining an exemplary channel
structure of the EUTRA and shows an uplink/downlink exemplary
channel structure assumed based on the proposition of 3GPP for the
EUTRA. A downlink physical channel of the EUTRA is made up of a
downlink pilot channel DPCH (Downlink Pilot Channel), a downlink
synchronization channel DSNCH (Downlink Synchronization Channel), a
downlink common control channel DCCCH (Downlink Common Control
Channel), and a downlink scheduling channel DSCH (Downlink
Scheduling Channel). The downlink scheduling channel DSCH includes
a downlink shared control signaling channel DSCSCH (Downlink Shared
Control Signaling Channel) and a downlink shared data channel DSDCH
(Downlink Shared Data Channel).
[0179] An uplink physical channel of the EUTRA is made up of an
uplink contention-based channel UCBCH (Uplink Contention-based
Channel) and an uplink scheduling channel USCH (Uplink Scheduling
Channel).
[0180] The outline of the downlink channels and the uplink channels
of the EUTRA will then briefly be described. FIG. 2 is a view of
correlations between the uplink/downlink channels of the EUTRA and
the W-CDMA/HSDPA mode assumed based on the proposition of 3GPP.
[0181] In the downlink of the EUTRA, the downlink pilot channel
DPCH includes a downlink common pilot channel DCPCH (Downlink
Common Pilot Channel) and a downlink dedicated pilot channel DDPCH
(Downlink Dedicated Pilot Channel).
[0182] The downlink common pilot channel DCPCH corresponds to the
pilot channel CPICH of the W-CDMA mode and is used for estimation
of a downlink propagation path status in the AMCS mode, cell
search, and propagation path loss measurement in the uplink
transmission power control. The downlink dedicated pilot channel
DDPCH is transmitted to individual mobile stations from an antenna
having a propagation path (directivity) different from a cell
shared antenna, such as an adaptive array antenna or can be used
for the purpose of reinforcing the downlink common pilot channel
DCPCH for a mobile station with lower reception quality.
[0183] The downlink synchronization channel DSNCH corresponds to
the synchronization channel SCH of the W-CDMA mode and is used for
cell search of mobile stations, a radio frame of the OFDM signal, a
time slot, a transmission timing interval TTI (Transmission Timing
Interval), and OFDM symbol timing synchronization.
[0184] The downlink common control channel DCCCH includes common
control information, such as broadcast information (corresponding
to the broadcast channel BCH) corresponding to the primary common
control physical channel P-CCPCH and the paging indicator channel
PICH of the W-CDMA mode and packet indicator PI information
indicating the presence or absence of a packet call (corresponding
to the paging indicator channel PICH).
[0185] The downlink scheduling channel DSCH is made up of a
downlink shared control signaling channel DSCSCH (Downlink Shared
Control Signaling Channel) and a downlink shared data channel DSDCH
(Downlink Shared Data Channel).
[0186] The downlink shared control signaling channel DSCSCH
corresponds to the HS-DSCH-related shared control channel HS-SCCH
included in the high-speed physical downlink shared channel
HS-PDSCH of the HSDPA mode, the downlink dedicated control channel
DPCCH, and the acquisition indicator channel AICH, is shared by a
plurality of mobile stations, and is used for transmitting to the
mobile stations the information necessary for demodulation of the
high-speed downlink shared channel HS-DSCH (such as a modulation
mode and a spread code), the information necessary for the error
correction decoding process and the HARQ process, the scheduling
information of radio resources (frequency and time), etc. A portion
of packet paging information and downlink access information
corresponding to the paging channel PCH included in the secondary
common control physical channel of the W-CDMA mode is also
transmitted as the downlink shared control signaling channel
DSCSCH.
[0187] The downlink shared data channel DSDCH corresponds to the
high-speed downlink shared channel HS-DSCH included in the
high-speed physical downlink shared channel HS-PDSCH of the HSDPA
mode and the downlink dedicated data channel DPDCH and is used for
transmitting packet data addressed to a mobile station from a
higher-level layer. A portion of packet paging information and
downlink access information corresponding to the paging channel PCH
included in the secondary common control physical channel of the
W-CDMA mode is also transmitted as data of the downlink shared data
channel DSDCH.
[0188] In the uplink, the uplink contention-based channel UCBCH
includes a fast access channel FACH (Fast Access Channel), a
reservation channel RCH (Reservation Channel), and an uplink
synchronization channel USNCH (Uplink Synchronization Channel). The
uplink contention-based channel UCBCH corresponds to the random
access channel RACH (Random Access Channel) of the W-CDMA mode.
[0189] The uplink scheduling channel USCH is made up of an uplink
shared data channel USDCH (Uplink Shared Data Channel) and an
uplink shared control signaling channel USCSCH (Uplink Shared
Control Signaling Channel). The uplink shared data channel USDCH
corresponds to the uplink dedicated control channel DPDCH of the
W-CDMA mode, is shared by the mobile stations, and is used for the
packet data transmission of the mobile stations. The uplink shared
control signaling channel USCSCH corresponds to the HS-DSCH-related
uplink dedicated physical control channel HS-DPCCH and the
dedicated control channel DPDCH of the HSDPA mode, is shared by the
mobile stations, and is used for transferring downlink channel
propagation path quality information CQI (Channel Quality
Indicator), feedback information such as HARQ, uplink pilot and
uplink channel control information, etc., of the mobile
stations.
[0190] The EUTRA will be described with regard to a flow of
transmission/reception of a packet call of the mobile station
assumed based on the proposition of 3GPP.
[0191] First, FIG. 3 shows state transitions of the mobile station
assumed based on the proposition of 3GPP. After power-on (10), the
mobile station performs the selection/reselection of public mobile
communication PLMN (Public Land Mobile Network) and the cell
selection (11). The mobile station also receives location
registration update and broadcast information (12) and transits to
an idle mode, which is the standby state (13). In the idle mode,
the cell selection/reselection is performed.
[0192] If an incoming packet (17) exists from the base station to
the mobile station, the mobile station receives the packet paging
indicator PI information indicating the presence or absence of the
packet call and the packet paging information corresponding to the
packet call, transits through a packet communication process
procedure to an active mode (15) during which the packet
communication is in progress, and transmits/receives the packet
data. If no packet data are transmitted/received for a period
longer than a timer (e.g., time interval of Tinact) provided on the
mobile station or the base station, the mobile station returns to
the idle mode (or also referred to as inactive mode) (13). The cell
selection/reselection is also performed in the active mode
(15).
[0193] If an outgoing packet (14) from a user exists, the mobile
station transits to the packet communication in progress (15)
through reception of the downlink access information (corresponding
to the downlink access channel FACH), transmission of the uplink
access information (corresponding to the random access channel
RACH), and the packet communication process procedure.
[0194] FIG. 4 is a view of an exemplary structure of a downlink
radio frame assumed based on the proposition of 3GPP for the EUTRA.
The downlink radio frame is two-dimensionally made up of Chunks,
which are clusters of a plurality of sub-carriers on the frequency
axis and the transmission timing interval TTI on the time axis. The
Chunk is made up of a cluster of several sub-carriers. For example,
on the frequency axis, if the entire spectrum (downlink frequency
bandwidth) B5 of the downlink is 20 MHz; the frequency bandwidth
Bch of the chunk is 1.25 MHz; and the sub-carrier frequency
bandwidth Bsc is 12.5 kHz, the frame includes 16 Chunks and 100
sub-carriers for each Chunk, i.e., a total of 1600 sub-carriers for
the downlink. On the time axis, if one radio frame is 10 ms and TTI
is 0.5 ms, 20 TTIs are included.
[0195] That is, in the above example, one radio frame includes 16
Chunks and 20 TTIs, and one TTI includes a plurality of OFDM symbol
lengths (Ts). Therefore, in this example, a minimum radio resource
available for the mobile station is made up of one Chunk (100
sub-carriers) and one TTI (0.5 ms). The radio resource of one Chunk
may further finely be divided. The TTI may be 0.67 ms, 0.625 ms,
etc.
[0196] As shown in FIG. 4, the downlink common pilot channel DCPCH
is mapped at the beginning of each TTI and the downlink dedicated
pilot channel DDPCH is mapped at a suitable position of one TTI
(e.g., mapped at the center portion of TTI) depending on the usage
status of the antenna of the base station or the propagation path
status of the mobile station.
[0197] The downlink common control channel DCCCH and the downlink
synchronization channel DSNCH are mapped in the TTI at the
beginning of the radio frame. Since these channels are mapped in
the TTI at the beginning of the radio frame, when the mobile
station is in the idle mode, the mobile station can receive common
control information such as cell search, timing synchronization and
broadcast information and packet paging information by receiving
only the TTI at the beginning of the radio frame or several OFDM
symbol lengths (Ts) of the TTI at the beginning of the radio
frame.
[0198] In the case of the idle mode, the mobile station performs
the discontinuous reception operation.
[0199] FIG. 5 is a conceptual view of the discontinuous reception
operation when the mobile station is in the idle mode. FIG. 5(A)
shows the same figure as the structure of the downlink radio frame
assumed based on the proposition of 3GPP of FIG. 4, and FIG. 5(B)
shows an image of the discontinuous reception operation in
accordance with FIG. 5(A).
[0200] As shown in FIG. 5, when the mobile station is in the idle
mode, the discontinuous operations include a discontinuous
operation 1 and a discontinuous operation 2, for example.
[0201] The discontinuous operation 1 is a discontinuous reception
method of turning on a receiving portion for the TTI1 period at the
beginning of the frame and turning off the receiving portion for
other periods. The discontinuous operation 2 is a discontinuous
reception method of turning on the receiving portion for the
periods of the downlink common pilot channel DCPCH, the downlink
common control channel DCCCH, the downlink shared control signaling
channel DSCSCH, and the downlink synchronization channel DSNCH of
the TTI1 at the beginning of the frame (several OFDM symbols Ts)
and turning off the receiving portion for other periods. Although
FIG. 5 shows an example of turning on the receiving portion for the
TTI1 period of each beginning of the frame, the receiving portion
may be turned on for every plurality of frame intervals.
[0202] The downlink shared control signaling channel DSCSCH is
mapped at the beginning portion of each TTI as is the case with the
downlink common pilot CPICH. Even while the mobile station performs
the packet communication, if no packet data addressed to the own
station exist in the TTI, the discontinuous reception can be
performed to receive only the downlink shared control signaling
channel DSCSCH.
[0203] Although FIG. 4 shows that the downlink pilot channel DPCH
(the downlink common pilot channel DCPCH and the downlink dedicated
pilot channel DDPCH), the downlink common control channel DCCCH,
the downlink shared control signaling channel DSCSCH, and the
downlink synchronization channel DSNCH are serially mapped between
the sub-carriers on the frequency axis, the channels may
discontinuously be mapped by thinning out between the
sub-carriers.
[0204] FIG. 6 is a view of another exemplary structure of the
downlink radio frame assumed based on the proposition of 3GPP for
the EUTRA. For example, as shown in FIG. 6, the downlink common
pilot channel DCPCH, the downlink common control channel DCCCH, and
the downlink shared control signaling channel DSCSCH may be
arranged in staggered sub-carriers instead of the structure of FIG.
4.
[0205] Although each of the above downlink channels is shown as an
example of using TDM for the entire downlink frequency band, CDM
(Code Division Multiplexing), FDM, or a combination of TDM and FDM
may be used.
[0206] Although each of the downlink channels indicates one OFDM
symbol length (Ts), a plurality of OFDM symbol lengths (Ts) may be
used depending on an information amount.
[0207] The downlink shared data channel DSDCH transmits packet data
addressed to the mobile stations based on the AMCS mode. By way of
example, as shown in FIG. 1, the channel is allocated to mobile
stations MS1, MS2, and MS3 depending on the propagation path
statuses of the mobile stations.
[0208] FIGS. 7 and 8 are views of respective exemplary structures
of a base station and a mobile station related to the present
invention. In FIG. 7, a base station 100 is made up of an antenna
portion 101, a radio portion 102, a demodulating portion 103, an
uplink channel estimating portion 104, a control data extracting
portion 105, a channel decoding portion 106, a channel coding
portion 107, a control data inserting portion 108, an OFDM
modulating portion 109, and a scheduling portion 110.
[0209] In FIG. 8, a mobile station 200 is made up of an antenna
portion 201, a radio portion 202, an OFDM demodulating portion 203,
a downlink channel estimating portion 204, a control data
extracting portion 205, a channel decoding portion 206, a channel
coding portion 207, a control data inserting portion 208, a
modulating portion 209, and a control portion 210.
[0210] A principle of operation of the base station 100 and the
mobile station 200 assumed based on the proposition of 3GPP will
briefly be described with reference to FIGS. 7 and 8.
[0211] In the base station 100, if the base station 100 receives
packet data (including the subscriber identification information,
for example, IMSI (International Mobile Subscriber Identity), IMEI
(International Mobile Equipment Identity), TMSI (Temporary Mobile
Subscriber Identity), TMEI (Temporary Mobile Equipment Identity),
and IP address) addressed to the mobile station 200 from a
higher-level network node (e.g., SGSN (Serving GPRS Support Node)
or RNC (Radio Network Control) of the W-CDMA mode, not shown), the
packet data are stored in a base-station transmission data buffer
(not shown). The downlink transmission data from the transmission
data buffer are input to the channel coding portion 107; the
channel coding portion 107 inputs the output signals from the
scheduling portion 110, i.e., downlink AMC information such as a
downlink AMC mode and downlink mobile station allocation
information (downlink scheduling information), uses the AMC mode
defined by the downlink AMC information (e.g., turbo code, encoding
rate 2/3) to execute the encoding process for the downlink
transmission data; and the output thereof is input to the control
data inserting portion 108.
[0212] The downlink control data include control data for the
downlink pilot channel DPCH, the downlink common control channel
DCCCH, and the downlink synchronization channel DSNCH. The downlink
control data are input to the control data inserting portion 108
and the control data mapping is performed for the downlink common
control channel DCCCH shown in FIG. 1. The packet indicator PI
information is mapped on the downlink common control channel DCCCH
in a specified or calculated frequency bandwidth (or mapped on the
downlink shared control signaling channel DSCSCH in some
cases).
[0213] On the other hand, the downlink AMC information (such as AMC
mode and downlink scheduling information) determined by the
scheduling portion 110 is input to the control data inserting
portion 108 and the control data mapping is performed for the
downlink shared control signaling channel DSCSCH.
[0214] The output of the control data inserting portion 108 is sent
to the OFDM modulating portion 109 along with the downlink common
control channel DCCCH, the downlink shared control signaling
channel DSCSCH, and the downlink shared data channel DSDCH mapped
thereon. The OFDM modulating portion 109 performs the data
modulation, the serial/parallel conversion of the input signal, and
the multiplication of the spread code and the scrambling code and
executes the OFDM signal process such as IFFT (Inverse Discrete
Fourier Transform), CP (Cyclic Prefix) insertion, and filtering to
generate the OFDM signal. The OFDM modulating portion 109 inputs
the downlink AMC information from the scheduling portion 110 to
control the data modulation (e.g., 16QAM) of the sub-carriers. The
radio frame shown in FIG. 4 is generated and converted to the RF
(Radio Frequency) frequency band by a transmission circuit of the
radio portion, and the downlink signal is transmitted from the
antenna portion.
[0215] On the other hand, the uplink signal sent from the mobile
station 200 is received by the antenna portion 101, converted from
the RF frequency to IF or directly to the base band by a reception
circuit of the radio portion, and input to the demodulating portion
103. The uplink signal may be an OFDM signal, an MC-CDMA
(Multi-Carrier-CDMA) signal, or a single carrier SC signal and a
VSCRF-CDMA (Variable Spreading and Chip Repetition Factors-CDMA)
signal for reducing PAPR (see, e.g., patent document 2 (Japanese
Laid-Open Patent Publication No. 2004-197756, "Mobile Station, Base
Station, and Wireless Transmission Program and Method")).
[0216] The uplink channel estimating portion 104 uses the uplink
pilot channel UPCH to estimate the propagation path quality of the
individual uplink channels of the mobile stations and calculates
the uplink propagation path quality information CQI. The calculated
uplink CQI information is input to the scheduling portion 110. The
uplink AMC information such as uplink AMC mode and uplink
scheduling information is input to the control data inserting
portion 108, mapped on the downlink shared control signaling
channel DSCSCH, and transmitted to the corresponding mobile station
200.
[0217] The corresponding mobile station 200 transmits packet data
with the determined uplink AMC mode and uplink scheduling
information in accordance with the uplink AMC information that is
output from the scheduling portion 110. The uplink signal of the
packet data is input to the demodulating portion 103 and the
channel decoding portion 106. On the other hand, the uplink AMC
information output from the scheduling portion 110 is input to the
demodulating portion and the channel decoding portion 106, and the
demodulation (e.g., QPSK) and decoding process (e.g., convolution
coding, encoding rate 2/3) is executed for the uplink signal in
accordance with this information.
[0218] The control data extracting portion 105 extracts control
information of the uplink contention-based channel UCBCH and the
uplink shared control signaling channel USCSCH. The control data
extracting portion 105 extracts the downlink channel propagation
path quality information CQI of the mobile station 200 sent through
the uplink shared control signaling channel USCSCH and inputs the
information to the scheduling portion 110 to generate the downlink
AMC information.
[0219] The scheduling portion 110 receives input of the uplink CQI
information from the uplink channel estimating portion 104, input
of the downlink CQI information feedback by the mobile station 200
from the control data extracting portion 105, and input of the
downlink/uplink transmission data buffer information, the
uplink/downlink QoS (Quality of Service) information, various
pieces of service class information, the mobile station class
information, and the subscriber identification information of the
mobile stations from a base station control portion (not
shown).
[0220] The scheduling portion 110 integrates these pieces of input
information, generates the uplink/downlink AMC information in
accordance with the selected scheduling algorithm at the specified
or calculated center frequency, and outputs the information to the
portions shown in FIG. 7 to implement the transmission scheduling
of the packet data.
[0221] The mobile station 200 receives the downlink OFDM signal
with the antenna portion 201, converts the downlink reception
signal from the RF frequency to IF or directly to the base band
with a local RF frequency oscillation circuit (synthesizer), a down
converter, a filter, an amplifier, etc., of the radio portion 202,
and inputs the signal to the OFDM demodulating portion 203. The
downlink channel estimating portion 204 uses the downlink pilot
channel DPCH (uses the downlink common pilot channel DCPCH, the
downlink dedicated pilot channel DDPCH, or a combination of both)
to estimate the propagation path quality of the individual downlink
channels of the mobile stations and calculates the downlink
propagation path quality information CQI. The calculated downlink
CQI information is input to the control data inserting portion 208,
mapped on the uplink shared control signaling channel USCSCH, and
transmitted to the base station 100.
[0222] The OFDM demodulating portion 203 performs CP (Cyclic
Prefix) removal of input signal, FFT (Discrete Fourier Transform),
and the multiplication of the spread code and the scrambling code,
executes the OFDM signal demodulation process such as the
parallel/serial conversion, data demodulation, and filtering to
generate the demodulation data, which are input to the control data
extracting portion 205.
[0223] The control data extracting portion 205 extracts the
downlink channel control information (such as packet indicator PI
information, packet paging information, downlink access
information, and broadcast information) other than the downlink
shared data channel DSDCH (the information is mapped on the
downlink shared control signaling channel DSCSCH in some cases).
The downlink AMC information is extracted such as the downlink AMC
mode and the downlink scheduling information mapped on the downlink
shared control signaling channel DSCSCH and is output to the OFDM
demodulating portion 203 and the channel decoding portion 206. The
uplink AMC information is extracted such as the uplink AMC mode and
the uplink scheduling information mapped on the downlink shared
control signaling channel DSCSCH and is output to the modulating
portion 209 and the channel coding portion 207.
[0224] The OFDM demodulating portion 203 uses the AMC mode (e.g.,
16QAM) defined by the downlink AMC information to demodulate the
sub-carriers. The channel decoding portion uses the AMC mode (e.g.,
turbo code, encoding rate 2/3) defined by the downlink AMC
information to decode the packet data addressed to the own station,
which are mapped on the downlink shared data channel DSDCH.
[0225] The channel coding portion 207 inputs the uplink
transmission data that are individual packet data of the mobile
station 200, uses the downlink AMC information (e.g., convolution
coding, encoding rate 2/3) output from the control data extracting
portion 205 to encode the data, which are output to the control
data inserting portion 208.
[0226] The control data inserting portion 208 maps the downlink CQI
information from the downlink channel estimating portion 204 onto
the uplink shared control signaling channel USCSCH included in the
uplink scheduling channel USCH and maps the uplink contention-based
channel UCBCH and the uplink scheduling channel USCH onto the
uplink transmission signal.
[0227] The modulating portion 209 uses the downlink AMC information
(e.g., QPSK) output from the control data extracting portion 205 to
perform data modulation and outputs the signal to a transmission
circuit of the radio portion 202. The uplink signal may be
modulated with the use of the OFDM signal, the MC-CDMA signal, or
the single carrier SC signal and the VSCRF-CDMA signal for reducing
PAPR.
[0228] The control portion 210 has the mobile station class
information, the unique frequency bandwidth information, and the
subscriber identification information. The control portion 210
sends a control signal causing a shift to the specified or
calculated center frequency to the radio portion 202 and performs
the shift to the center frequency with the local RF frequency
oscillation circuit (synthesizer) of the radio portion 202.
[0229] A base band signal is converted to the RF frequency band by
the local RF frequency oscillation circuit (synthesizer), an
upconverter, a filter, and an amplifier of the radio portion 202
and the uplink signal is transmitted from the antenna portion 201.
The radio portion 202 includes IF and RF filters corresponding to
the above different frequency bandwidths (e.g., 1.25 MHz, 2.5 MHz,
5 MHz, 10 MHz, 20 MHz).
[0230] FIG. 9 is a view for explaining a first embodiment of the
present invention. The first embodiment proposes a method of
specifying an operating frequency band position of a mobile station
for containing within the unique frequency bandwidth of the base
station device the mobile stations in the different mobile station
classes assumed based on the proposition of 3GPP for the EUTRA. The
operating frequency band of the mobile station is a frequency band
used by at least the mobile station in the active mode for
transmitting/receiving packets.
[0231] In FIG. 9, when the unique frequency bandwidth of the base
station is 20 MHz, numbers are applied to the downlink frequency
bands used by the respective mobile stations in the different
mobile station classes. A structure will hereinafter be described
for the numbers allocated to the operating frequency bands of the
mobile stations. In the structure shown in FIG. 9, it is assumed
that the operating frequency bands of the mobile stations do not
overlap.
[0232] The operating frequency band position of the mobile station
in the 20-MHz or 15-MHz mobile station class is inevitably
determined since only one option exists as shown in FIG. 9. The
operating frequency band position of the mobile station in the
10-MHz mobile station class has two candidates (Nos. 0 and 1
(binary number representation)), and the operating frequency band
position of the mobile station in the 5-MHz mobile station class
has four candidates (Nos. 00, 01, 10, and 11). The operating
frequency band position of the mobile station in the 2.5-MHz mobile
station class has eight candidates (Nos. 000 to 111), and the
operating frequency band position of the mobile station in the
1.25-MHz mobile station class has 16 candidates (Nos. 0000 to
1111).
[0233] The mobile stations in the respective mobile station classes
are shifted to suitable frequency positions selected from the above
candidates of the operating frequency band. The frequency band
positions of the mobile stations should fairly be selected without
a bias in consideration of the frequency utilization
efficiency.
[0234] Since individual information is not exchanged between the
base station and the mobile station at the time of the idle mode,
the base station cannot comprehend the operating frequency band
position of the idle-mode mobile station contained in the own
station. Therefore, when notifying the mobile station of an
incoming packet at the start of the downlink communication, the
base station does not know what frequency band should be used for
transmitting the paging information. Although this can be solved if
all the mobile stations in the idle mode receive the paging
information in the same predetermined frequency band, since the
mobile stations in all the mobile station classes transmit/receive
the paging information and the specification information of the
operating frequency band position in a certain frequency band,
traffics are increased in the certain frequency band, resulting in
reduction in the frequency utilization efficiency.
[0235] Even if the operating frequency bands are arranged such that
certain frequency bands are used by respective mobile station
classes, traffics in a certain frequency band are not improved when
all the mobile stations within the base station are in the 1.25-MHz
mobile station class, for example. Therefore, the operating
frequency band positions should be selected in such a method of
reducing a communication traffic amount of the paging information
and the shift position specification information at the start of
the downlink communication.
[0236] Similarly, the mobile station does not know what frequency
band should be used for transmitting the contention-based access at
the start of the uplink communication. Although this can be solved
if all the mobile stations in the idle mode perform the
contention-based access in the same predetermined frequency band,
since all the mobile stations perform the contention-based access
in a certain frequency band, a collision frequency is increased in
the certain frequency band. Therefore, the operating frequency band
positions should be selected in such a method of reducing the
collision frequency of the contention-based access at the start of
the uplink communication.
[0237] If the mobile stations always receive the downlink signals
in the frequency bandwidths determined in the mobile station
classes in the idle mode, this is inefficient in power consumption
for the mobile station in the mobile station class having a greater
frequency band. Since the reception signal should be received by
the mobile station in the 1.25-MHz mobile station class at the time
of the idle mode, the mobile stations in the mobile station classes
equal to or greater than 1.25 MHz should also receive only the
1.25-MHz bandwidth signals to narrow down the reception bandwidth
and reduce the power consumption.
[0238] Therefore, a plurality of mobile stations is grouped that
have the same frequency band position of receiving the downlink
signals at the time of the idle mode and is referred to as an IM
group (idle mode group). It is assumed here that each IM group
receives a frequency bandwidth of 1.25 MHz. The frequency band
received by the IM group is defined as an operating frequency band
at the time of the idle mode. The frequency band position of the IM
group is included in the operating frequency band. The IM group
includes different mobile station classes. Since the bandwidth
received by the IM group is 1.25 MHz, the numbers for the operating
frequency band candidates of the 1.25-MHz mobile station class can
also be used as the number indicating the IM groups.
[0239] A plurality of mobile stations belonging to the same IM
group is grouped into an incoming packet group and is referred to
as a PI group (packet indicator group). If a mobile station
belonging to a PI group #n is notified of the presence of an
incoming call to the PI group #n through the packet indicator PI,
the mobile station receives the downlink shared control signaling
channel DSCSCH and the downlink shared data channel DSDCH to check
whether an incoming packet addressed to the own station exists.
[0240] For example, a number 010100010 shown in FIG. 9 indicates
that a mobile station in the 5-MHz mobile station class belongs to
an operating frequency band position of 01, an IM group of 0101,
and a PI group of 00010.
[0241] Due to the grouping in the reception frequency area of the
downlink signals at the time of the idle mode, the mobile stations
in the idle mode receive signals in a narrower frequency bandwidth
and the power consumption can be reduced.
[0242] By combining and more finely dividing the grouping in the
frequency domain and the grouping in the time domain (FDM/TDM), the
reception frequency/time positions of the mobile stations in the
idle mode can be distributed. As a result, the mobile stations in
the idle mode receive signals in narrow ranges in both frequency
and time and the power consumption can considerably be reduced.
This can be implemented by further dividing the IM group and
arranging the packet indicator PI for each TTI, for example.
Specifically, a bit indicating a TTI position in a frame may be
added to the IM group number as shown in FIG. 10.
[0243] FIG. 11 is a view of how the numbers are applied to
candidates for the operating frequency bands of mobile stations in
different mobile station classes when the unique frequency
bandwidths of the base station are 15 MHz, 10 MHz, 5 MHz, and 2.5
MHz; FIG. 11(A) shows the case that the unique frequency bandwidth
of the base station is 15 MHz; FIG. 11(B) shows the case that the
unique frequency bandwidth of the base station is 10 MHz; FIG.
11(C) shows the case that the unique frequency bandwidth of the
base station is 5 MHz; and FIG. 11(D) shows the case that the
unique frequency bandwidth of the base station is 2.5 MHz. By
applying the numbers corresponding to the unique frequency
bandwidths of the base station as above, the unique frequency
bandwidths of the base station can flexibly be accommodated.
[0244] To perform the above specification without communication
between the base station and the mobile station, the subscriber
identification information identifying the mobile station is
utilized which is retained by both the base station and the mobile
station at the time of an incoming packet. The subscriber
identification information is IMSI, TMSI, IMEI, TMEI used in the
W-CDMA mode or information for identifying a subscriber or terminal
such as an IP address allocated to a mobile station. By way of
example, description will be made here based on IMSI.
[0245] The operating frequency band position, the IM group, and the
PI group are calculated from the subscriber identification
information IMSI (IMSI=1, 2, 3, . . . , n), the unique frequency
bandwidth MBnb (Node B Maximum Band, MBnb=1.25, 2.5, 5, 10, 20 MHz)
of the base station, and the unique frequency bandwidths Bn of the
mobile stations.
[0246] FIG. 12 is a view for explaining a calculating method of the
operating frequency band position, the IM group, and the PI
group.
[0247] It is assumed here that the subscriber identification
information is IMSI=101010010100010 (binary number representation),
that the unique frequency bandwidth of the mobile station is Bn=5
MHz, that the unique frequency bandwidth of the base station is
MBnb=20 MHz, and that the bandwidth received by the IM group is
Bim=1.25 MHz. Calculations are then made for an operating frequency
band position number Ps identifying the operating frequency band
position, an IM group number Pim identifying the IM group, and a PI
group number Ppi identifying the PI group. The number of PI groups
Npi included in the bandwidth Bim received by the IM group is 32.
The total number of the PI groups included in the 20-MHz bandwidth
is 512.
[0248] The highest two bits of 010100010 calculated through the
calculation of the subscriber identification information IMSI mod
512 indicate that the operating frequency band position number Ps
is 01 of the 5-MHz band; the highest four bits indicate that the IM
group number Pim is 0101; and the lowest five bits indicate that
the PI group number Ppi is 00010.
[0249] The calculating equations generalizing the above processes
are as follows.
number of IM groups (Nim)=MBnb (MHz)/Bim (MHz) (Eq. 1)
number of IM groups in operating frequency band position
(Nim.sub.--s)=Bn (MHz)/Bim (MHz) (Eq. 2)
PI group number (Ppi)=IMSI mod Npi (Eq. 3)
IM group number (Pim)=IMSI/Npi mod Nim (Eq. 4)
number of candidates for operating frequency band position
(Ns)=MBnb/Bn (Eq. 5)
operating frequency band position number
(Ps)=IMSI/(Npi.times.Nim.sub.--s)mod Ns (Eq. 6)
[0250] However, if the IM groups at the time of the idle mode are
arranged in the FDM/TDM arrangement, when the number of TTI in the
frame is Ntti=20, the equations are as follows.
time-direction IM group number (Pim.sub.--t)=IMSI/Npi/Nim mod
Ntti,
FDM/TDM IM group number (Pim.sub.--ft)=Pim.times.Pim.sub.--t.
[0251] FIG. 13 is another view for explaining the calculating
method of the operating frequency band position, the IM group, and
the PI group and shows the calculating method when the subscriber
identification information is IMSI=101010010100010 (binary number
representation); the unique frequency bandwidth of the mobile
station is Bn=5 MHz; the unique frequency bandwidth of the base
station is MBnb=15 MHz; and the number of PI groups is Npi=32. In
this case, when using the above equations, the operating frequency
band position number, the IM group number, and the PI group number
are as follows.
number of IM groups (Nim)=15/1.25=12 (Eq. 7)
number of IM groups in operating frequency band position
(Nim.sub.--s)=5/1.25=4 (Eq. 8)
PI group number (Ppi)=21666 mod 32=00010 (Eq. 9)
IM group number (Pim)=21666/32 mod 12=0101 (Eq. 10)
number of candidates for operating frequency band position
(Ns)=15/5=3 (Eq. 11)
operating frequency band position number (Ps)=21666/(32.times.4)
mod 3=01 (Eq. 12)
[0252] FIG. 14 is yet another view for explaining the calculating
method of the operating frequency band position, the IM group, and
the PI group and shows the calculating method when the subscriber
identification information is IMSI=101010010100100 (binary number
representation); the unique frequency bandwidth of the mobile
station is Bn=15 MHz; the unique frequency bandwidth of the base
station is MBnb=20 MHz; and the number of PI groups is Npi=32. In
this case, when using the above equations, the operating frequency
band position number, the IM group number, and the PI group number
are as follows.
number of IM groups (Nim)=20/1.25=16 (Eq. 13)
number of IM groups in operating frequency band position
(Nim.sub.--s)=15/1.25=12 (Eq. 14)
PI group number (Ppi)=21540 mod 32=00100 (Eq. 15)
IM group number (Pim)=21540/32 mod 16=0001 (Eq. 16)
number of candidates for operating frequency band position
(Ns)=20/15=1 (Eq. 17)
operating frequency band position number (Ps)=21540/(32.times.4)
mod 1=0 (Eq. 18)
[0253] If the base-station unique frequency bandwidth MBnb is 20
MHz and the mobile-station unique frequency bandwidth Bn is 15 MHz,
the frequency band corresponding to the remaining 5 MHz cannot be
used by the mobile station. For example, if the operating frequency
band position of the mobile station in the 15-MHz mobile station
class is fixed to the center of the base-station unique frequency
bandwidth of 20 MHz as shown in FIG. 9, the IM group position may
correspond to right and left 2.5-MHz bands unusable for the mobile
stations in the case of the above calculating method. A means of
avoiding this situation may be a method of performing calculations
with the base-station unique frequency bandwidth MBnb set to 15 MHz
and using a number sequence for the base-station unique frequency
bandwidth of 15 MHz shown in FIG. 11(A) to specify the IM group
position.
[0254] In another method, the operating frequency band position of
the mobile station in the 15-MHz mobile station class is made
variable such that the position can be shifted from the center
frequency of 15 MHz to the right or left by 2.5 MHz. As shown in
FIG. 14, five candidates a to e for the mobile-station operating
frequency band position are available and the operating frequency
band position is selected in accordance with the IM group number.
As a result, the base station having the unique frequency bandwidth
of 20 MHz can efficiently arrange the mobile stations in the 15-MHz
mobile station class.
[0255] The above method is applicable to the mobile stations in the
classes other than the 15-MHz mobile station class. The operating
frequency bands can flexibly be configured by correlating and
prescribing the IM group numbers and the operating frequency bands
without fixing the structures of the 15-MHz, 10-MHz, 5-MHz, and
2.5-MHz operating frequency bands. For example, in the case of the
mobile stations in the 5-MHz mobile station class, the operating
frequency bands may be structured in an overlapping manner as shown
in FIG. 15.
[0256] The calculated operating frequency band position number (Ps)
can be used for calculating an uplink/downlink RF center frequency
and channel number UARFCN (UTRA Absolute Radio Frequency Channel
Number, (non-patent document 6); 3GPP TS 25.101, V6.8.0 (2005-06),
User Equipment (UE) radio transmission and reception (FDD),
http://www.3gpp.org/ftp/Specs/html-info/25-series.htm) of the radio
portion 102 of the base station device and the radio portion 202 of
the mobile station.
[0257] First, the minimum frequency DL_NBfmin of the downlink
bandwidth of the mobile station is calculated with the unique
frequency bandwidth MBnb of the base station and the downlink
center frequency NBfc of the base station.
DL.sub.--NBfmin=NBfc-MBnb/2 (Eq. 19)
[0258] The center frequency DL_Fs of the downlink operating
frequency band of the mobile station and the IM group center
frequency DL_Fim are then calculated.
DL.sub.--Fs=NBfmin+Bn(2Ps+1)/2 (MHz) (Eq. 20)
DL.sub.--Fim=NBfmin+Bim(2Pim+1)/2 (MHz) (Eq. 21)
[0259] For example, in the case of the base-station unique
frequency bandwidth MBnb=20 MHz and the base-station downlink
center frequency NBfc=2144.9 MHz, the minimum frequency DL_NBfmin
of the downlink operating frequency band of the mobile station is
as follows.
DL.sub.--NBfmin=NBfc-MBnb/2=2144.9-20/2=2134.9 MHz (Eq. 26)
[0260] In the case of FIG. 12, the center frequency DL_Fs of the
downlink operating frequency band of the mobile station and the IM
group center frequency DL_Fim are as follows (Bn=5 MHz, MBnb=20
MHz, Bim=1.25 MHz, Npi=32, Ps=1, Pim=5, Ppi=2, Nim=16, Nim_s=4,
Ns=4),
DL.sub.--Fs=NBfmin+Bn(2Ps+1)/2=2134.9+5.times.(2+1)/2=2142.4 (MHz)
(Eq. 22)
DL.sub.--Fim=NBfmin+1.25(2Pim+1)/2=2134.9+1.25.times.(2.times.5+1)/2=214-
2.05 (MHz) (Eq. 23).
[Table 1]
TABLE-US-00001 [0261] TABLE 1 UTRA FDD frequency bands UL
Frequencies DL Frequencies Operating UE transmit, UE receive, Band
Node B receive Node B transmit 1 1920-1980 MHz 2110-2170 MHz 2
1850-1910 MHz 1930-1990 MHz 3 1710-1785 MHz 1805-1880 MHz 4
1710-1755 MHz 2110-2155 MHz 5 824-849 MHz 869-894 MHz 6 830-840 MHz
875-885 MHz
[0262] With the operating band shown in Table. 1, the center
frequency of the uplink operating frequency band of the mobile
station and the IM group center frequency can be calculated.
UL.sub.--Fs=DL.sub.--Fs-190=1952.4 (MHz) (Eq. 24)
UL.sub.--Fim=DL.sub.--Fim-190=1952.05 (MHz) (Eq. 25)
[0263] FIGS. 16 and 17 are views for explaining a process when the
mobile station is powered on and transits to the idle mode; FIG. 16
is a flowchart for explaining the process in this case; and FIGS.
17(A) and 17(B) show the bands used by the mobile station and main
channels used in the procedures for the uplink and the downlink,
respectively. In FIG. 17, reference numerals (reference numerals of
steps of the mobile station) are added for correlation with the
flow of FIG. 16.
[0264] In FIG. 17, B1, B2, B3, B4, and B5 denote frequency
bandwidths of 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, and 20 MHz,
respectively. By way of example, a control flow of the mobile
station in the B3 mobile station class will be described.
[0265] After power-on, the mobile station performs the selection
(band search) of the public mobile communication network PLMN
(Public Land Mobile Network) (step S11). The base station transmits
information through the downlink common pilot channel DPCH, the
downlink synchronization channel DSNCH, and the downlink common
control channel DCCCH (step S21).
[0266] The mobile station uses the own IMSI, the base-station
unique frequency bandwidth MBnb, and the base-station downlink
center frequency NBfc acquired through the band search to calculate
the operating frequency band position number Ps, the IM group
number Pim, the PI group number Ppi, the center frequency DL_Fs of
the mobile-station downlink operating frequency band, the downlink
IM group center frequency DL_Fim, the center frequency UP_Fs of the
mobile-station uplink operating frequency band, and the uplink IM
group center frequency UP_Fim (step S12).
[0267] In accordance with the center frequencies DL_Fs1, UL_Fs1 of
the operating frequency band calculated from the above known
parameters, the mobile station sets the local RF frequency
oscillation circuit (synthesizer) of the radio portion 202 and
performs the frequency shift to the operating frequency band
position. The mobile station then performs initial cell selection
(cell search) (step S13), receives the broadcast information (step
S14), and starts an initial location registration process.
[0268] The downlink common pilot channel DPCH and the downlink
synchronization channel DSNCH used at the time of the initial cell
selection are received in the operating frequency band with the
center frequency of DL_Fs1 calculated above. Similarly, the
downlink common control channel DCCCH used at the time of receiving
the broadcast information is also received in the operating
frequency band with the center frequency of DL_Fs1 calculated
above. The load of control in the mobile station is alleviated by
using the same band as the band for receiving the downlink common
pilot channel DPCH, the downlink synchronization channel DSNCH, and
the downlink common control channel DCCCH and the operating
frequency band at the time of the idle mode.
[0269] As shown in FIGS. 18 and 19, in the downlink radio frame
structure with the downlink common control channel DCCCH mapped on
the center frequency NBfc of the base-station unique frequency
bandwidth MBnb, the initial cell selection step and the broadcast
information reception step are executed at the center frequency
NBfc of the base-station unique frequency bandwidth MBnb (see step
13 and step 14 of FIG. 17). After the broadcast information is
received, the operating frequency band position number Ps, the IM
group number Pim, and the PI group number Ppi may be calculated in
some structures.
[0270] To receive the downlink common control channel DCCCH in the
operating frequency band with the center frequency of DL_Fs1
calculated above, as shown in FIGS. 20 and 21, the downlink common
control channel DCCCH must be mapped onto the downlink radio frame
structure shown in FIGS. 18 and 19 for every 1.25-MHz bandwidth or
every Chunk. We propose as a countermeasure method to arrange the
downlink common control channel DCCCH throughout the downlink
unique frequency bandwidth MBnb for every 1.25-MHz bandwidth or
every chunk, to copy what is common to all the mobile stations, and
to add and arrange pieces of information specific to respective
bands or Chunks as needed.
[0271] The initial location registration process will then be
described. The mobile station uses the uplink contention-based
channel UCBCH to transmit a request signal for the uplink packet
access at the start of the initial location registration process
(step S15). This uplink packet access request signal includes the
subscriber identification information IMSI. When receiving the
uplink packet access request signal, the base station transmits an
uplink packet access permission signal including the default
scheduling setup information and RNTI (Radio Network Temporary ID),
which is a number for identifying the mobile station in the base
station. As a result, a radio bearer is established.
[0272] The uplink contention-based channel UCBCH and the downlink
scheduling channel DSCH used in this case are transmitted/received
at the operating frequency band positions calculated above.
Therefore, the collision frequency is reduced at the time of the
uplink request, and the procedures are reduced in the initial
scheduling of the downlink.
[0273] Once the radio bearer is established, a location
registration message is transmitted to a higher-level node of the
network. When receiving the location registration message, the
higher-level node transmits temporary subscriber identification
information, for example, TMSI (Temporary Mobile Subscriber
Identity), TMEI (Temporary Mobile Equipment Identity), a temporary
IP address, etc., along with approval of the location registration.
A key exchange protocol and an authentication process are executed
at the same time (step S16, step S23). The uplink scheduling
channel USCH and the downlink scheduling channel DSCH used in this
case are transmitted/received in the operating frequency bands with
the center frequencies of UL_Fs1, DL_Fs1 calculated above.
[0274] The mobile station and the base station recalculate the
operating frequency band position number Ps, the IM group number
Pim, and the PI group number Ppi with the above calculating
equations from the temporary subscriber identification information
(steps S17 and S24). In accordance with the center frequencies
DL_Fs2, UL_Fs2 of the calculated operating frequency band, the
mobile station performs the frequency shift to the operating
frequency band position. When the location registration is
completed, the radio bearer is released and the mobile station
shifts to the idle mode.
[0275] FIGS. 22 and 23 are views for explaining a process at the
time of the idle mode; FIG. 22 is a flowchart for explaining the
process flow in this case; and FIGS. 23(A) and 23(B) show the bands
used by the mobile station and main channels used in the procedures
for the uplink and the downlink, respectively. In FIG. 23,
reference numerals (reference numerals of steps of the mobile
station) are added for correlation with the flow of FIG. 22.
[0276] The mobile station shifted to the idle mode receives the
downlink common pilot channel DPCH, the downlink synchronization
channel DSNCH, and the downlink common control channel DCCCH
transmitted from the base station to periodically perform the cell
selection and update the broadcast information (steps S31, S32, and
S41).
[0277] In this case, the downlink common pilot channel DPCH, the
downlink synchronization channel DSNCH, and the downlink common
control channel DCCCH are received at the center frequency NBfc of
the base-station unique frequency bandwidth MBnb for the downlink
radio frame structure shown in FIGS. 18 and 19. The operating
frequency band with the calculated center frequency of DL_Fs2 may
also be used as the operating frequency band position at the time
of the idle mode for the downlink radio frame structure shown in
FIGS. 20 and 21 in some structures.
[0278] The mobile station checks whether the registration area
indicated by the broadcast information is changed (step S33). If
the registration area is not changed, it is checked whether a
location registration timer has expired (step S34). If the location
registration timer has not expired, a reception procedure for the
packet indicator PI is started. If the registration area is changed
or the location registration timer has expired, a location
registration process is executed (steps S35 and S42).
[0279] The location registration process includes steps of the
uplink packet access request through the uplink contention-based
channel UCBCH, the establishment of the radio bearer, the
transmission and reception of the location registration information
thorough the uplink scheduling channel USCH and the downlink
scheduling channel DSCH, and the release of the radio bearer as is
the case with the initial location registration process described
in FIGS. 16 and 17 (the operation frequency band is different).
[0280] After the location registration process is completed, the
location registration timer is set (step S36), and the reception
procedure for the packet indicator PI is started. Although only the
timer for location registration has been described here, the timer
for cell search or the timer for PI may be prepared.
[0281] FIGS. 24 and 25 are views for explaining a control process
for an incoming packet; FIG. 24 is a flowchart for explaining the
process flow in this case; and FIGS. 25(A) and 25(B) show the bands
used by the mobile station and main channels used in the procedures
for the uplink and the downlink, respectively. In FIG. 25,
reference numerals (reference numerals of steps of the mobile
station) are added for correlation with the flow of FIG. 24.
[0282] When transmitting a packet to the mobile station shifted to
the idle mode, the base station calculates the IM group Pim and the
PI group Ppi from the IMSI of the packet destination and sets the
packet indicator PI (step S61). The mobile station shifted to the
idle mode receives the packet indicator PI at the position
indicated by the IM group Pim and the PI group Ppi obtained from
the above calculating equations through the discontinuous reception
(step S51).
[0283] If the packet indicator PI indicates an incoming packet
(step S52), the downlink scheduling channel DSCH is received to
acquire detail information related to paging (corresponding to the
paging information of the W-CDMA mode) included in the paging
channel PCH (logical channel) (steps S53 and S62). If the packet
indicator PI indicates no incoming packet at step S52, the packet
indicator PI is received that is included in the next radio frame
or in the radio frame after a plurality of radio frame intervals
(discontinuous reception).
[0284] The position of the paging channel PCH to be received by the
mobile station is preliminarily determined in association with the
position of the packet indicator PI. If the mobile station acquires
information identifying itself (such as IMSI, IMEI, IP address, and
RNTI) from the detail information related to paging, the mobile
station executes the radio bearer establishing procedure (steps
S54, S55, and S63). The mobile station receives packet indicator PI
included in the next radio frame or in the radio frame after a
plurality of radio frame intervals (discontinuous reception) if the
incoming packet is not addressed to itself.
[0285] After the radio bearer is established, the mobile station
starts receiving the packet through the downlink scheduling channel
DSCH (step S56). The base station transmits the packet through the
downlink scheduling channel DSCH until the buffer of user data
becomes empty (step S64). When the buffer of the base station
becomes empty, the radio bearer is released (steps S65 and S66).
The packet transmission procedure is then started. Although only
the packet reception has been described here, the packet
transmission may concurrently be performed.
[0286] FIGS. 26 and 27 are views for explaining a control process
at the time of packet transmission; FIG. 26 is a flowchart for
explaining the process flow in this case; and FIGS. 27(A) and 27(B)
show the bands used by the mobile station and main channels used in
the procedures for the uplink and the downlink, respectively. In
FIG. 27, reference numerals (reference numerals of steps of the
mobile station) are added for correlation with the flow of FIG.
26.
[0287] If a packet to be transmitted exists (step S71), the mobile
station uses the uplink contention-based channel UCBCH to transmit
a request signal for the uplink packet access (step S72). When
receiving the request signal for the uplink packet access (step
S81), the base station transmits an uplink packet access permission
signal including the default scheduling setup information and RNTI
(Radio Network Temporary ID), which is a number for identifying the
mobile station in the base station. As a result, a radio bearer is
established (steps S73 and S82).
[0288] When the radio bearer is established, the mobile station
transmits the packet through the uplink scheduling channel USCH
(steps S74 and S83). When the data buffer of the mobile station
becomes empty (step S75), the radio bearer is released (steps S76
and S84). The mobile station goes back to the control procedure at
the time of the idle mode.
[0289] Although the mobile station in the idle mode
transmits/receives the channels in the own unique frequency
bandwidth in the above description, the transmission/reception may
be designed to be performed in the bandwidth Bim (=B1) used by the
IM group to reduce the power consumption at the time of the idle
mode. During communication, the mobile station uses a bandwidth
ranging from Bim to the unique frequency bandwidth Bn depending on
a data amount.
[0290] With the method described above, the operating frequency
bands of the channels used by the mobile station can be specified
with the communication between the base station and the mobile
station reduced to the minimum.
[0291] FIGS. 28, 29, and 30 are views of respective exemplary
structures of the downlink radio frame of the present invention,
showing the optimum arrangements of the broadcast information, the
downlink synchronization channel DSNCH, the packet indicator PI,
and the downlink shared control signaling channel DSCSCH based on
FIG. 4. In each of FIGS. 28 to 30, (A) shows a structure of the
downlink radio frame, and (B) shows an image of the discontinuous
reception operation in conformity to (A).
[0292] In FIG. 28, the downlink common control channel DCCCH is
located in the TTI at the beginning of the radio frame for every IM
group bandwidth Bim and can be received in the bandwidth specified
by the IM group at the time of the idle mode. The packet indicator
PI is located in each TTI by further dividing the IM group. In this
case, the packet indicator PI is mapped as a portion of the
downlink shared control signaling channel DSCSCH.
[0293] With the above structure, at the time of the idle mode, the
mobile station can perform the cell search, the timing
synchronization, and the reception of the broadcast information and
the packet indicator PI in the band specified by the IM group and
the process of the frequency shift can be omitted. Since the packet
indicator PI is mapped on the downlink shared control signaling
channel DSCSCH, the packet reception process in the case of the
active mode can be made common to the incoming packet process in
the idle mode in the mobile station.
[0294] The discontinuous reception operation in this structure is a
discontinuous reception method of turning on the receiving portion
for the periods of the downlink common pilot channel DCPCH, the
downlink common control channel DCCCH, the downlink synchronization
channel DSNCH of the TTI at the beginning of the frame, and the
downlink shared signaling channel DSCSCH having the paging
indicator PI mapped thereon, and turning off the receiving portion
for other periods.
[0295] In FIG. 29, the downlink common control channel DCCCH is
located in the TTI at the beginning of the radio frame for every IM
group bandwidth Bim as is the case with FIG. 28 and can be received
in the bandwidth specified by the IM group at the time of the idle
mode. However, the packet indicator is mapped as a portion of the
downlink common control channel DCCCH. With this structure, at the
time of the idle mode, the mobile station can perform the cell
search, the timing synchronization, and the reception of the
broadcast information and the packet indicator PI in the band
specified by the IM group of the TTI at the beginning and the
process of the frequency shift can be omitted.
[0296] The discontinuous reception operation in this structure is a
discontinuous reception method of turning on the receiving portion
for the periods of the downlink common pilot channel DCPCH, the
downlink common control channel DCCCH, and the downlink
synchronization channel DSNCH of the TTI at the beginning of the
frame and turning off the receiving portion for other periods.
[0297] In FIG. 30, the downlink common control channel DCCCH is
located in a certain B1 bandwidth in the TTI at the beginning of
the radio frame. The mobile station shifts to the certain B1
bandwidth at the time of the cell search, the timing
synchronization, and the reception of the broadcast information.
The packet indicator PI is mapped as a portion of the downlink
common control channel DCCCH.
[0298] The discontinuous reception operation in this structure is a
discontinuous reception method of turning on the receiving portion
for the periods of the downlink common pilot channel DCPCH, the
downlink common control channel DCCCH, and the downlink
synchronization channel DSNCH of the TTI at the beginning of the
frame and turning off the receiving portion for other periods.
[0299] Although not shown, the downlink common control channel
DCCCH may be located in a certain B1 bandwidth in the TTI at the
beginning of the radio frame and the packet indicator PI may be
mapped onto the downlink shared control signaling channel.
[0300] As shown in FIG. 5, the downlink common pilot channel DCPCH,
the downlink common control channel DCCCH, and the downlink shared
control signaling channel DSCSCH may alternately be arranged in
sub-carriers.
[0301] Although the candidates for the operating frequency band of
the mobile station in the idle mode are arranged to be distributed
over the entire unique frequency bandwidth of the base station in
the above description, the candidates may be arranged to be
distributed over a certain limited range of the frequency bandwidth
within the unique frequency bandwidth of the base station. For the
calculating equations in such a case, the unique frequency band of
the base station of the equations 1 to 6 may be replaced with the
limited range of the frequency bandwidth.
[0302] Although it is desirable that the operating frequency band
position of the mobile station at the time of the idle mode is
included in the operating frequency band of the mobile station, the
subscriber identification information may be utilized to separately
calculate the operating frequency band of the mobile station at the
time of the idle mode and the operating frequency band of the
mobile station. For example, the downlink common control channel
DCCCH and the packet indicator PI may be located in a certain range
of the frequency bandwidth and the remaining bandwidth may be used
as the frequency band for transmitting/receiving packets. For the
calculating equations in such a case, the unique frequency band of
the base station of the equations 1 to 6 may be replaced with the
limited range of the frequency bandwidth.
[0303] FIG. 31 is a view of respective exemplary structures of the
base station, the mobile station, and a location management device
related to another embodiment of the present invention. In FIG. 31,
the base station 100 is made up of an antenna portion 111, a radio
portion 112, a control portion 113, and a communication IF 114; the
mobile station 200 is made up of an antenna portion 211, a radio
portion 212, and a control portion 213, and a location management
device 300 is made up of a location management database 301, a
control portion 302, and a communication IF 303. The base station
100 corresponds to a base station device of the present invention
and the mobile station 200 corresponds to a mobile station device
of the present invention.
[0304] A principle of operation of the base station 100, the mobile
station 200, and the location management device 300 assumed based
on the proposition of 3GPP will briefly be described with reference
to FIG. 31.
[0305] In the base station 100, if the base station 100 receives
packet data (including the subscriber identification information,
for example, IMSI) addressed to the mobile station 200 through the
communication IF 114 from a higher-level network node, the packet
data are stored in a base-station transmission data buffer (not
shown). For the downlink transmission data from the transmission
data buffer, the control portion 113 performs the channel mapping
and the scheduling. The downlink transmission data are subjected to
the encoding process and the OFDM signal process by the radio
portion 112 and converted into the RF (Radio Frequency) frequency
band by a transmission circuit of the radio portion 112, and the
downlink signal is transmitted from the antenna portion 111.
[0306] On the other hand, the uplink signal sent from the mobile
station 200 is received by the antenna portion 111 of the base
station 100 and converted from the RF frequency to IF or directly
to the base band by a reception circuit of the radio portion 112
for demodulation. The uplink signal may be an OFDM signal, an
MC-CDMA (Multi-Carrier-CDMA) signal, or a single carrier SC signal
and a VSCRF-CDMA (Variable Spreading and Chip Repetition
Factors-CDMA) signal for reducing PAPR (see, e.g., Japanese
Laid-Open Patent Publication No. 2004-197756, "Mobile Station, Base
Station, and Wireless Transmission Program and Method"). When
receiving the packet to the higher-level network node from the
mobile station 200, the control portion 113 of the base station 100
transfers the packet through the communication IF 114 to the
higher-level network node.
[0307] The scheduling in the control portion 113 of the base
station 100 is performed based on the uplink CQI information, the
downlink CQI information feedback from the mobile station 200, the
downlink/uplink transmission data buffer information of the mobile
stations, the uplink/downlink QoS (Quality of Service) information,
various pieces of service class information, the mobile station
class information, the subscriber identification information, etc.
These pieces of the input information are put together and the
uplink/downlink AMC information is generated in accordance with a
selected scheduling algorithm to implement the
transmission/reception scheduling of the packet data.
[0308] When receiving a paging request to the mobile station 200
through the communication IF 114 from the location management
device 300, the control portion 113 of the base station 100
instructs the radio portion 112 to map the packet indicator
(corresponding to the paging indicator channel PICH of the W-CDMA
mode) and the paging information (corresponding to the paging
channel PCH of the W-CDMA mode) to the mobile station 200. The
mapping position instruction information is generated based on the
paging request (including IMSI and the available frequency
bandwidth of the mobile station). When an attach/location
registration request to the location management device 300 is
received from the mobile station 200, the request is transferred
through the communication IF 114 to the location management device
300.
[0309] The mobile station 200 then receives the downlink OFDM
signal with the antenna portion 211, converts the downlink
reception signal from the RF frequency to IF or directly to the
base band with a local RF frequency oscillation circuit
(synthesizer), a down converter, a filter, an amplifier, etc., of
the radio portion 212, and performs the OFDM demodulation and the
channel decoding to decode the packet data. In the radio portion
212 of the mobile station 200, the uplink transmission data, i.e.,
individual packet data of the mobile station 200 are encoded with
the use of the information extracted by the control portion 213 and
is subjected to the data modulation and transmitted along with the
downlink CQI information with the use of the downlink AMC
information.
[0310] The control portion 213 of the mobile station 200 extracts
the downlink channel control information (such as the packet
indicator PI information, the packet paging information, the
downlink access information, and the broadcast information). The
control portion 213 extracts and outputs the downlink AMC mode and
the downlink AMC information such as the downlink scheduling
information, and the uplink AMC mode and the uplink AMC information
such as the uplink scheduling information to the radio portion 212.
The control portion 213 performs the scheduling based on the
downlink channel control information and the downlink scheduling
information sent out from the base station 100, and the uplink
scheduling information.
[0311] The control portion 213 of the mobile station sends to the
radio portion 212 a control signal causing a shift to the specified
or calculated center frequency retained by the mobile station class
information, the unique frequency bandwidth information, and the
subscriber identification information. The local RF frequency
oscillation circuit (synthesizer) of the radio portion 212 performs
the shift to the center frequency
[0312] The control portion 213 detects the need for the attach and
the location registration process from the broadcast information
and controls the location registration procedure as needed. The
control portion 213 also acquires the packet indicator PI
information to control the incoming packet process.
[0313] In the mobile station 200, the base band signal is converted
to the RF frequency band by the local RF frequency oscillation
circuit (synthesizer), an upconverter, a filter, and an amplifier
of the radio portion 212 and the uplink signal is transmitted from
the antenna portion 211. The radio portion 212 includes IF and RF
filters corresponding to the above different frequency bandwidths
(e.g., 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 20 MHz).
[0314] The location management device 300 corresponds to the VLR
and HLR of the W-CDMA mode and receives and registers a location
registration request from the mobile station 200 into the location
management database 301. If an incoming call to the mobile station
200 exists, the registration information of the mobile station 200
is acquired from the location management database and a paging
request is transmitted through the communication IF 303 to the base
station in the location registration area. The location
registration and paging procedures are controlled by the control
portion 302.
[0315] FIGS. 32 and 33 are views for explaining one embodiment of
the present invention. This embodiment proposes a paging and
location registration method in a system containing mobile stations
with different frequency bandwidths (e.g., 1.25 MHz, 2.5 MHz, 5
MHz, 10 MHz, 20 MHz) assumed based on the proposition of 3GPP for
the EUTRA.
[0316] In FIG. 32, if an incoming packet to the mobile station 200
exists for the location management device 300, the location
management device 300 acquires the registration information of the
mobile station 200 from the location management database 301 and
transmits a paging request to the base station 100 in a location
registration area 400.
[0317] If the unique frequency bandwidth of the base station is 20
MHz, the respective mobile stations 200 with different frequency
bandwidths (in this case, the mobile stations with frequency
bandwidth abilities of 1.25 MHz and 20 MHz) receive a paging signal
in the downlink frequency bands used respectively.
[0318] The paging signal refers to the packet indicator PI or the
paging information. The paging is performed by acquiring the
location registration area 400 of the mobile station 200 having an
incoming packet from the location management database 301 and by
sending out a paging request from the location management device
300 to the base station 100 of the location registration area 400.
Since the base station 100 does not know what frequency band
position is used by the mobile station 200 at this time,
information identifying the operating frequency band position of
the mobile station 200 having the incoming packet must be included
in the information of the paging request.
[0319] FIG. 33 is a view for explaining the location registration
process example of the mobile station.
[0320] The mobile station 200 performs the attach/location
registration process at the time of power-on, at the time of
location registration area update, and when a location registration
period has been expired. The mobile station 200 sends out a
location registration request through the base station 100 to the
location management device 300. This location registration request
includes the subscriber identification information (IMSI or IP
address) and information indicating the available frequency
bandwidth of the mobile station 200 or the operating frequency band
position of the mobile station 200. If the available frequency
bandwidth of the mobile station 200 is registered, the base station
100 needs an algorithm for identifying the operating frequency band
position of the mobile station 200 based on the subscriber
identification information and the available frequency bandwidth of
the mobile station at the time of paging.
[0321] FIG. 34 is a view for explaining a numbering method of
identifying the operating frequency band position of the mobile
station used at the time of location registration and the time of
paging.
[0322] FIG. 34(A) shows candidates of frequency band positions used
by the mobile stations with different available frequency
bandwidths when it is assumed that the unique frequency bandwidth
of the base station is 20 MHz. The operating band of the mobile
station having the 20-MHz bandwidth or 15-MHz bandwidth ability is
inevitably determined since only one option exists as shown in FIG.
34(A). The operating band of the mobile station having the 10-MHz
bandwidth ability has two candidates (Nos. 0 and 1); the operating
band of the mobile station having the 5-MHz bandwidth ability has
four candidates (Nos. 0 to 3); the operating band of the mobile
station having the 2.5-MHz bandwidth ability has eight candidates
(Nos. 0 to 7); and the operating band of the mobile station having
the 1.25-MHz bandwidth ability has 16 candidates (Nos. 0 to
15).
[0323] FIG. 34(B) shows classification of the mobile stations
having respective available bandwidths. In this case, ID Nos. 0 to
5 are assigned in the order from 1.25 MHz to 20 MHz.
[0324] The operating frequency band position of the mobile station
is identified by including the candidate numbers of FIG. 34(A) and
IDs of FIG. 34(B) in the location registration request and the
paging request.
[0325] An algorithm is then proposed that identifies the operating
frequency band position from the subscriber identification
information IMSI and the above mobile station classes. The
operating frequency band position is calculated from the subscriber
identification information IMSI, the available frequency bandwidth
Bn of the mobile station, the unique frequency bandwidth MBnb of
the base station, the operating frequency band position number Ps
identifying the operating frequency band position, and the number
of incoming groups Npi of the packet indicator as follows.
number of candidates for shifted frequency position (Ns)=MBnb/Bn
(Eq. 27)
shifted frequency position number (Ps)=IMSI/Npi mod Ns (Eq. 28)
[0326] If the subscriber identification information IMSI and the ID
indicating the available frequency bandwidth of the mobile station
are included in the location registration request and the paging
request, the operating frequency band position of the mobile
station can be identified with the above calculating equations in
the base station and the mobile station.
[0327] FIG. 35 is a view for explaining a procedure of location
registration according to the present invention.
[0328] The mobile station 200 performs the attach/location
registration process at the time of power-on, at the time of
location registration area update, and when a location registration
period has been expired.
[0329] First, a radio bearer is set between the base station 100
and the mobile station 200 in accordance with a connection control
procedure (S101). After the connection control procedure is
completed, the mobile station 200 sends out a location registration
request through the base station 100 to the location management
device 300 (S102, S103). This location registration request
includes the subscriber identification information and the
available frequency bandwidth of the mobile station 200.
[0330] When receiving the location registration request, the
location management device 300 registers the subscriber
identification information (IMSI) and the available frequency
bandwidth and the location registration area of the mobile station
200 into the location management database (S104). The location
management device 300 returns a location registration response to
the mobile station 200 (S105, S106). Temporary subscriber
identification information TMSI may be allocated through this
location registration response. The authentication, the exchange of
the private key, etc., are concurrently performed in this location
registration procedure.
[0331] FIG. 36 is a view for explaining a procedure of paging
according to the present invention.
[0332] When receiving an incoming packet to the mobile station 200
(S111), the location management device 300 acquires the subscriber
identification information of the destination mobile station 200 of
the packet and the available frequency bandwidth and the location
registration area of the mobile station 200 from the location
management database and sends out a paging request including the
subscriber identification information (IMSI) and the available
frequency bandwidth of the mobile station to the base station of
the location registration area (S112).
[0333] When receiving the paging request, the base station 100
calculates and retains the operating frequency band position of the
mobile station 200 from the subscriber identification information
and the available frequency bandwidth of the mobile station 200
(S113) and transmits the packet of the paging request at the
operating frequency band position (S114).
[0334] When receiving the paging request at the own operating
frequency band position, the mobile station 200 sends out a
response to the location management device 300 (S115, S116).
[0335] Although the available frequency bandwidth of the mobile
station 200 is registered in the location management device 300 in
the description of FIGS. 35 and 36, the operating frequency band
position of the mobile station 200 may be registered.
[0336] A program operating in the base station device, the mobile
station device, and the location management device related to the
present invention is a program controlling a CPU, etc., (program
driving a computer to implement functions) such that the location
registration method and the paging method of the mobile station
related to the present invention are executed. The information
handled by these devices is temporarily accumulated in a RAM at the
time of process, subsequently stored in various ROMs and HDD, and
read and modified/rewritten by the CPU as needed.
[0337] A recording medium having the program stored thereon may be
any one of a semiconductor medium (e.g., ROM, nonvolatile memory
card), an optical recording medium (e.g., DVD, MO, MD, CD, BD), a
magnetic recording medium (e.g., magnetic tape, flexible disc),
etc.
[0338] Although the functions of the above embodiment are
implemented by executing the loaded program, the functions of the
present invention may also be implemented by executing processes
based on instructions of the program in conjunction with an
operating system or other application programs.
[0339] When distributing to the market, the program can be stored
and distributed in a portable recording medium or can be
transferred to a server computer connected through a network such
as the internet. In this case, a storage device of the server
computer is also included in the recording medium of the present
invention.
* * * * *
References