U.S. patent application number 16/802767 was filed with the patent office on 2020-06-25 for terminal apparatus, base station apparatus, and integrated circuit.
The applicant listed for this patent is Sharp Kabushiki Kaisha. Invention is credited to Tatsushi AIBA, Shoichi SUZUKI.
Application Number | 20200205170 16/802767 |
Document ID | / |
Family ID | 49161220 |
Filed Date | 2020-06-25 |
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United States Patent
Application |
20200205170 |
Kind Code |
A1 |
AIBA; Tatsushi ; et
al. |
June 25, 2020 |
TERMINAL APPARATUS, BASE STATION APPARATUS, AND INTEGRATED
CIRCUIT
Abstract
A terminal apparatus, a base station apparatus, a communication
method, an integrated circuit, and a radio communication system are
provided that enable a base station apparatus and a terminal
apparatus to determine parameters relating to an uplink reference
signal and efficiently communicate with each other. A terminal
apparatus that transmits a demodulation reference signal, the
terminal apparatus comprising: means for receiving a cell-specific
parameter used for enabling or disabling a sequence group hopping,
means for a user-equipment-specific parameter used for disabling
the sequence group hopping, and means for generating a sequence of
the demodulation reference signal on the basis of the enabled or
disabled sequence group hopping, wherein, in a case that a
transmission on the physical uplink shared channel corresponding to
a downlink control information format to which CRC parity bits
scrambled by a temporary C-RNTI are attached, the sequence group
hopping is enabled or disabled on the basis of the cell-specific
parameter.
Inventors: |
AIBA; Tatsushi; (Osaka,
JP) ; SUZUKI; Shoichi; (Osaka, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Sharp Kabushiki Kaisha |
Osaka |
|
JP |
|
|
Family ID: |
49161220 |
Appl. No.: |
16/802767 |
Filed: |
February 27, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15857689 |
Dec 29, 2017 |
10638495 |
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16802767 |
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15394877 |
Dec 30, 2016 |
9894673 |
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15857689 |
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14384536 |
Sep 11, 2014 |
9553633 |
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PCT/JP2013/057008 |
Mar 13, 2013 |
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15394877 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 72/042 20130101;
H04L 1/1887 20130101; H04W 72/0413 20130101; H04J 13/0074 20130101;
H04W 72/121 20130101; H04B 1/713 20130101; H04L 5/00 20130101; H04L
27/2613 20130101; H04L 5/0012 20130101; H04B 1/7103 20130101; H04L
5/0051 20130101 |
International
Class: |
H04W 72/12 20060101
H04W072/12; H04W 72/04 20060101 H04W072/04; H04L 5/00 20060101
H04L005/00; H04B 1/713 20060101 H04B001/713; H04B 1/7103 20060101
H04B001/7103; H04L 27/26 20060101 H04L027/26; H04L 1/18 20060101
H04L001/18; H04J 13/00 20060101 H04J013/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 14, 2012 |
JP |
2012-056893 |
Claims
1. (canceled)
2. A user equipment comprising: receiving circuitry configured to
receive, from a base station apparatus, a first parameter used to
enable or disable a group hopping, the receiving circuitry
configured to receive, from the base station apparatus, a second
parameter used to disable the sequence group hopping; and
transmitting circuitry configured to transmit, to the base station
apparatus, a demodulation reference signal associated with a
transmission of a physical uplink shared channel (PUSCH), a
reference signal sequence of the demodulation reference signal
being generated based on whether the group hopping is enabled or
disabled, wherein for a transmission of a PUSCH scheduled by using
a random access response grant, the group hopping is enabled or
disabled based on the first parameter, and for a transmission of a
PUSCH scheduled by using downlink control information (DCI) format
with cyclic redundancy check (CRC) scrambled by a cell-radio
network temporary identifier, the group hopping is disabled based
on the second parameter.
3. The user equipment according to claim 2, wherein for a
transmission of a PUSCH scheduled by using DCI with CRC scrambled
by a temporary C-RNTI, the group hopping is enabled or disabled
based on the first parameter.
4. A base station apparatus comprising: transmitting circuitry
configured to transmit, to a user equipment, a first parameter used
to enable or disable a group hopping, the transmitting circuitry
configured to transmit, to the user equipment, a second parameter
used to disable the sequence group hopping; and receiving circuitry
configured to receive, from the user equipment, a demodulation
reference signal associated with a reception of a physical uplink
shared channel (PUSCH), a reference signal sequence of the
demodulation reference signal being generated based on whether the
group hopping is enabled or disabled, wherein for a reception of a
PUSCH scheduled by using a random access response grant, the group
hopping is enabled or disabled based on the first parameter, and
for a reception of a PUSCH scheduled by using downlink control
information (DCI) format with cyclic redundancy check (CRC)
scrambled by a cell-radio network temporary identifier, the group
hopping is disabled based on the second parameter.
5. The base station apparatus according to claim 4, wherein for a
reception of a PUSCH scheduled by using DCI with CRC scrambled by a
temporary C-RNTI, the group hopping is enabled or disabled based on
the first parameter.
6. A communication method for a user equipment, comprising:
receiving, from a base station apparatus, a first parameter used to
enable or disable a group hopping; receiving, from the base station
apparatus, a second parameter used to disable the sequence group
hopping; and transmitting, to the base station apparatus, a
demodulation reference signal associated with a transmission of a
physical uplink shared channel (PUSCH), a reference signal sequence
of the demodulation reference signal being generated based on
whether the group hopping is enabled or disabled, wherein for a
transmission of a PUSCH scheduled by using a random access response
grant, the group hopping is enabled or disabled based on the first
parameter, and for a transmission of a PUSCH scheduled by using
downlink control information (DCI) format with cyclic redundancy
check (CRC) scrambled by a cell-radio network temporary identifier,
the group hopping is disabled based on the second parameter.
7. The communication method according to claim 6, wherein for a
transmission of a PUSCH scheduled by using DCI with CRC scrambled
by a temporary C-RNTI, the group hopping is enabled or disabled
based on the first parameter.
8. A communication method for a base station apparatus, comprising:
transmitting, to a user equipment, a first parameter used to enable
or disable a group hopping; transmitting, to the user equipment, a
second parameter used to disable the sequence group hopping; and
receiving, from the user equipment, a demodulation reference signal
associated with a reception of a physical uplink shared channel
(PUSCH), a reference signal sequence of the demodulation reference
signal being generated based on whether the group hopping is
enabled or disabled, wherein for a reception of a PUSCH scheduled
by using a random access response grant, the group hopping is
enabled or disabled based on the first parameter, and for a
reception of a PUSCH scheduled by using downlink control
information (DCI) format with cyclic redundancy check (CRC)
scrambled by a cell-radio network temporary identifier, the group
hopping is disabled based on the second parameter.
9. The communication method according to claim 8, wherein for a
reception of a PUSCH scheduled by using DCI with CRC scrambled by a
temporary C-RNTI, the group hopping is enabled or disabled based on
the first parameter.
Description
TECHNICAL FIELD
[0001] The present invention relates to a terminal apparatus, a
base station apparatus, a communication method, an integrated
circuit, and a radio communication system.
BACKGROUND ART
[0002] In a radio communication system such as LTE (Long-Term
Evolution) or LTE-A (LTE-Advanced) developed by the 3GPP (Third
Generation Partnership Project) or WiMAX (Worldwide
Interoperability for Microwave Access) developed by the IEEE
(Institute of Electrical and Electronics Engineers), a base station
and a terminal each include one or a plurality of transmission and
reception antennas and can realize high-speed data communication
using, for example, a MIMO (multiple input multiple output)
technique.
[0003] Here, in radio communication systems, it is being examined
to support MU-MIMO (multiple user MIMO), in which a plurality of
terminals perform spatial multiplexing using the same frequency and
time resources. In addition, it is being examined to support a CoMP
(cooperative multipoint) communication scheme, in which a plurality
of base stations cooperatively perform interference coordination.
For example, a radio communication system is being examined that
adopts a heterogeneous network deployment (HetNet) realized by a
macro base station having wide coverage and an RRH (remote radio
head) having coverage narrower than that of the macro base
station.
[0004] In such a radio communication system, if uplink reference
signals transmitted by a plurality of terminals have the same
characteristics, interference occurs. Here, for example, a method
has been proposed for orthogonalizing demodulation reference
signals (DMRSs) transmitted by the plurality of terminals to one
another in order to reduce or suppress interference between the
demodulation reference signals (NPL 1).
CITATION LIST
Non Patent Literature
[0005] NPL 1: DMRS enhancements for UL CoMP; 3GPP TSG RAN WG1
meeting #68 R1-120277, Feb. 6th-10th, 2012.
SUMMARY OF INVENTION
Technical Problem
[0006] With respect to radio communication systems, however, there
has been no description regarding a specific procedure used by a
base station and a terminal for determining parameters relating to
an uplink reference signal. That is, there has been no description
regarding how a base station and a terminal determine the
parameters relating to the uplink reference signal and communicate
with each other.
[0007] The present invention has been established in view of the
above problem, and an object thereof is to provide a base station
apparatus, a terminal apparatus, a communication method, an
integrated circuit, and a communication system that enable a base
station and a terminal to determine parameters relating to an
uplink reference signal and efficiently communicate with each
other.
Solution to Problem
[0008] (1) In order to achieve the above object, the present
invention takes the following measures. That is, a terminal
apparatus that transmits a demodulation reference signal associated
with a physical uplink shared channel to a base station apparatus,
the terminal apparatus comprising: means for receiving, from the
base station apparatus, a cell-specific parameter used for enabling
or disabling a sequence group hopping, means for receiving, from
the base station apparatus, a user-equipment-specific parameter
used for disabling the sequence group hopping, and means for
generating a sequence of the demodulation reference signal on the
basis of the enabled or disabled sequence group hopping, wherein,
in a case that a transmission on the physical uplink shared channel
corresponding to a downlink control information format to which CRC
parity bits scrambled by a temporary C-RNTI are attached is
performed in a random access procedure, the sequence group hopping
is enabled or disabled on the basis of the cell-specific parameter
regardless of the user-equipment-specific parameter.
[0009] (2) In addition, a terminal apparatus that transmits a
demodulation reference signal associated with a physical uplink
shared channel to a base station apparatus, the terminal apparatus
comprising: means for receiving, from the base station apparatus, a
cell-specific parameter used for enabling or disabling a sequence
group hopping, means for receiving, from the base station
apparatus, a user-equipment-specific parameter used for disabling
the sequence group hopping, and means for generating a sequence of
the demodulation reference signal on the basis of the enabled or
disabled sequence group hopping, wherein, in a case that a
transmission of a Message 3 on the physical uplink shared channel
corresponding to a random access response grant is performed in a
random access procedure, the sequence group hopping is enabled or
disabled on the basis of the cell-specific parameter regardless of
the user-equipment-specific parameter.
[0010] (3) In addition, a terminal apparatus that transmits a
demodulation reference signal associated with a physical uplink
shared channel to a base station apparatus, the terminal apparatus
comprising; means for receiving, from the base station apparatus, a
cell-specific parameter used for enabling or disabling a sequence
group hopping, means for receiving, from the base station
apparatus, a user-equipment-specific parameter used for disabling
the sequence group hopping, and means for generating a sequence of
the demodulation reference signal on the basis of the enabled or
disabled sequence group hopping, wherein the sequence group hopping
is disabled on the basis of the user-equipment-specific parameter
regardless of the cell-specific parameter, unless a transmission of
a Message 3 is on the physical uplink shared channels corresponding
to a downlink control information format to which CRC parity bits
scrambled by a temporary C-RNTI are attached or on the physical
uplink shared channel corresponding to a random access response
grant is performed in a random access procedure.
[0011] (4) In addition, a base station apparatus that receives a
demodulation reference signal associated with a physical uplink
shared channel from a terminal apparatus, a sequence of the
demodulation reference signal being generated on the basis of
enabled or disabled sequence group hopping, the base station
apparatus comprising: means for transmitting, to the terminal
apparatus, a cell-specific parameter used for enabling or disabling
the sequence group hopping, and means for transmitting, to the
terminal apparatus, a user-equipment-specific parameter used for
disabling the sequence group hopping, wherein, in a case that a
downlink control information format to which CRC parity bits
scrambled by a temporary C-RNTI are attached is used for scheduling
for a transmission on the physical uplink shared channel in a
random access procedure, the sequence group hopping is enabled or
disabled on the basis of the cell-specific parameter regardless of
the user-equipment-specific parameter.
[0012] (5) In addition, a base station apparatus that receives a
demodulation reference signal associated with a physical uplink
shared channel from a terminal apparatus, a sequence of the
demodulation reference signal being generated on the basis of
enabled or disabled sequence group hopping, the base station
apparatus comprising: means for transmitting, to the terminal
apparatus, a cell-specific parameter used for enabling or disabling
the sequence group hopping, and means for transmitting, to the
terminal apparatus, a user-equipment-specific parameter used for
disabling the sequence group hopping, wherein, in a case that a
random access response grant is used for scheduling for a
transmission of a Message 3 on the physical uplink shared channel
in a random access procedure, the sequence group hopping is enabled
or disabled on the basis of the cell-specific parameter regardless
of the user-equipment-specific parameter.
[0013] (6) In addition, a base station apparatus that receives a
demodulation reference signal associated with a physical uplink
shared channel from a terminal apparatus, a sequence of the
demodulation reference signal being generated on the basis of
enabled or disabled sequence group hopping, the base station
apparatus comprising: means for transmitting, to the terminal
apparatus, a cell-specific parameter used for enabling or disabling
the sequence group hopping, and means for transmitting, to the
terminal apparatus, a user-equipment-specific parameter used for
disabling the sequence group hopping, wherein the sequence group
hopping is disabled on the basis of the user-equipment-specific
parameter regardless of the cell-specific parameter, unless a
downlink information format to which CRC parity bits scrambled by a
temporary C-RNTI are attached or a random access response grant is
used for scheduling for a transmission of a Message 3 on the
physical uplink shared channels in a random access procedure.
[0014] (7) In addition, an integrated circuit mounted on a terminal
apparatus that transmits a demodulation reference signal associated
with a physical uplink shared channel to a base station apparatus,
the integrated circuit causing the terminal apparatus causing the
terminal apparatus to realize: a function of receiving, from the
base station apparatus, a cell-specific parameter used for enabling
or disabling a sequence group hopping, a function of receiving,
from the base station apparatus, a user-equipment-specific
parameter used for disabling the sequence group hopping, a function
of generating a sequence of the demodulation reference signals on
the basis of the enabled or disabled sequence group hopping, and a
function of enabling or disabling, in a case that a transmission on
the physical uplink shared channel corresponding to a downlink
control information format to which CRC parity bits scrambled by a
temporary C-RNTI are attached is performed in a random access
procedure, the sequence group hopping on the basis of the
cell-specific parameter regardless of the user-equipment-specific
parameter.
[0015] (8) In addition, an integrated circuit mounted on a terminal
apparatus that transmits a demodulation reference signal associated
with a physical uplink shared channel to a base station apparatus,
the integrated circuit causing the terminal apparatus causing the
terminal apparatus to realize a function of receiving, from the
base station apparatus, a cell-specific parameter used for enabling
or disabling a sequence group hopping, a function of receiving,
from the base station apparatus, a user-equipment-specific
parameter used for disabling the sequence group hopping, a function
of generating a sequence of the demodulation reference signal on
the basis of the enabled or disabled sequence group hopping, and a
function of enabling or disabling, in a case that a transmission of
a Message 3 on the physical uplink shared channel corresponding to
a random access response grant is performed in a random access
procedure, the sequence group hopping on the basis of the
cell-specific parameter regardless of the user-equipment-specific
parameter.
[0016] (9) In addition, an integrated circuit mounted on a terminal
apparatus that transmits a demodulation reference signal associated
with a physical uplink shared channel to a base station apparatus,
the integrated circuit causing the terminal apparatus to realize a
function of receiving, from the base station apparatus, a
cell-specific parameter used for enabling or disabling a sequence
group hopping, a function of receiving, from the base station
apparatus, a user-equipment-specific parameter used for disabling
the sequence group hopping, a function of generating a sequence of
the demodulation reference signal on the basis of the enabled or
disabled sequence group hopping, and a function of disabling the
sequence group hopping on the basis of the user-equipment-specific
parameter regardless of the cell-specific parameter, unless a
transmission of a Message 3 on the physical uplink shared channel
corresponding to a downlink control information format to which CRC
parity bits scrambled by a temporary C-RNTI are attached or on the
physical uplink shared channel corresponding to a random access
response grant in a random access procedure.
[0017] (10) An integrated circuit mounted on a base station
apparatus that receives a demodulation reference signal associated
with a physical uplink shared channel from a terminal apparatus, a
sequence of the demodulation reference signal being generated on
the basis of enabled or disabled a sequence group hopping, the
integrated circuit causing the base station apparatus to realize a
function of transmitting, to the terminal apparatus, a
cell-specific parameter used for enabling or disabling the sequence
group hopping, a function of transmitting, to the terminal
apparatus, a user-equipment-specific parameter used for disabling
the sequence group hopping, and a function of enabling or
disabling, in a case that a downlink control information format to
which CRC parity bits scrambled by a temporary C-RNTI are attached
is used for scheduling for a transmission on the physical uplink
shared channel in a random access procedure, the sequence group
hopping on the basis of the cell-specific parameter regardless of
the user-equipment-specific parameter.
[0018] (11) An integrated circuit mounted on a base station
apparatus that receives a demodulation reference signal associated
with a physical uplink shared channel from a terminal apparatus, a
sequence of the demodulation reference signal being generated on
the basis of enabled or disabled sequence group hopping, the
integrated circuit causing the base station apparatus to realize a
function of transmitting, to the terminal apparatus, a
cell-specific parameter used for enabling or disabling the sequence
group hopping, a function of transmitting, to the terminal
apparatus, a user-equipment-specific parameter used for disabling
the sequence group hopping, a function of enabling or disabling, in
a case that a random access response grant is used for scheduling
for a transmission of a Message 3 on the physical uplink shared
channel, the sequence group hopping on the basis of the
cell-specific parameter regardless of the user-equipment-specific
parameter.
[0019] (12) In addition, an integrated circuit mounted on a base
station apparatus that receives a demodulation reference signal
associated with a physical uplink shared channel from a terminal
apparatus, a sequence of the demodulation reference signal being
generated on the basis of enabled or disabled sequence group
hopping, the integrated circuit causing the base station apparatus
to realize a function of transmitting, to the terminal apparatus, a
cell-specific parameter used for enabling or disabling the sequence
group hopping, a function of transmitting, to the terminal
apparatus, a user-equipment-specific parameter used for disabling
the sequence group hopping, and a function of disabling the
sequence group hopping on the basis of the user-equipment-specific
parameter regardless of the cell-specific parameter, unless a
downlink information format to which CRC parity bits scrambled by a
temporary C-RNTI are attached or a random access response grant is
used for scheduling for a transmission of a Message 3 on the
physical uplink shared channels in a random access procedure.
Advantageous Effects of Invention
[0020] According to the present invention, a base station and a
terminal can determine parameters relating to an uplink reference
signal and efficiently communicate with each other.
BRIEF DESCRIPTION OF DRAWINGS
[0021] FIG. 1 is a schematic block diagram illustrating the
configuration of a base station according to an embodiment of the
present invention.
[0022] FIG. 2 is a schematic block diagram illustrating the
configuration of a terminal according to the embodiment of the
present invention.
[0023] FIG. 3 is a schematic diagram illustrating an example of
communication according to the embodiment of the present
invention.
[0024] FIG. 4 is a diagram illustrating an example of downlink
signals.
[0025] FIG. 5 is a flowchart illustrating the embodiment of the
present invention.
DESCRIPTION OF EMBODIMENTS
[0026] An embodiment of the present invention will be described
hereinafter. A radio communication system according to the
embodiment of the present invention includes a primary base station
(also referred to as a macro base station, a first base station, a
first communication apparatus, a serving base station, an anchor
base station, or a primary cell) and a secondary base station (also
referred to as an RRH, a pico base station, a femto base station, a
Home eNodeB, a second base station apparatus, a second
communication apparatus, cooperative base stations, a cooperative
base station set, a cooperative base station, or a secondary cell)
as base station apparatuses (hereinafter also referred to as base
stations, transmission apparatuses, cells, serving cells,
transmission stations, transmission points, transmission antennas,
transmission antenna ports, or eNodeBs). In addition, a mobile
station apparatus (hereinafter also referred to as a terminal, a
terminal apparatus, a mobile terminal, a reception apparatus, a
reception point, a reception terminal, a third communication
apparatus, reception antennas, reception antenna ports, or user
equipment (UE)) is also included.
[0027] Here, the secondary base station may be a plurality of
secondary base stations. For example, the primary base station and
the secondary base station adopt heterogeneous network deployment,
in which part or all of the coverage of the secondary base station
is included in the coverage of the primary base station, in order
to communicate with the terminal.
[0028] FIG. 1 is a schematic block diagram illustrating the
configuration of the base station according to the embodiment of
the present invention. Here, the base station illustrated in FIG. 1
may be a primary base station or a secondary base station. The base
station is configured by including a data control unit 101, a
transmission data modulation unit 102, a radio unit 103, a
scheduling unit 104, a channel estimation unit 105, a reception
data demodulation unit 106, a data extraction unit 107, a higher
layer 108, and an antenna 109. In addition, the radio unit 103, the
scheduling unit 104, the channel estimation unit 105, the reception
data demodulation unit 106, the data extraction unit 107, the
higher layer 108, and the antenna 109 configure a reception
section. In addition, the data control unit 101, the transmission
data modulation unit 102, the radio unit 103, the scheduling unit
104, the higher layer 108, and the antenna 109 configure a
transmission section. Here, each component configuring the base
station will also be referred to as a unit.
[0029] The data control unit 101 receives transport channels from
the scheduling unit 104. The data control unit 101 maps the
transport channels and signals generated in a physical layer in
physical channels on the basis of scheduling information input from
the scheduling unit 104. Each piece of data mapped is output to the
transmission data modulation unit 102.
[0030] The transmission data modulation unit 102 modulates and
encodes transmission data. The transmission data modulation unit
102 generates the transmission data by performing signal
processing, such as modulation, encoding, serial-to-parallel
conversion of input signals, an IFFT (inverse Fast Fourier
transform) process, and CP (cyclic prefix) insertion, on the data
input from the data control unit 101 on the basis of the scheduling
information from the scheduling unit 104 or the like. The
transmission data modulation unit 102 then outputs the generated
transmission data to the radio unit 103.
[0031] The radio unit 103 up-converts the transmission data input
from the transmission data modulation unit 102 into radio
frequencies to generate radio signals and transmits the radio
signals to the terminal through the antenna 109. In addition, the
radio unit 103 receives radio signals from the terminal through the
antenna 109. The radio unit 103 then down-converts the radio
signals into baseband signals and outputs reception data to the
channel estimation unit 105 and the reception data demodulation
unit 106.
[0032] The scheduling unit 104, for example, maps logical channels
and transport channels and performs downlink and uplink scheduling.
The scheduling unit 104 includes interfaces between the scheduling
unit 104 and the antenna 109, the radio unit 103, the channel
estimation unit 105, the reception data demodulation unit 106, the
data control unit 101, the transmission data modulation unit 102,
and the data extraction unit 107, in order to integrally control
processing units in the physical layers.
[0033] In addition, in the downlink scheduling, the scheduling unit
104 performs transmission control in the transport channels and the
physical channels and generates scheduling information on the basis
of uplink control information received from the terminal,
scheduling information input from the higher layer 108, and the
like. The scheduling information used for the downlink scheduling
is output to the data control unit 101.
[0034] In addition, in the uplink scheduling, the scheduling unit
104 generates scheduling information on the basis of an uplink
channel state output from the channel estimation unit 105, the
scheduling information input from the higher layer 108, and the
like. The scheduling information used for the uplink scheduling is
output to the data control unit 101.
[0035] In addition, the scheduling unit 104 maps downlink logical
channels input from the higher layer 108 in the transport channels
and outputs the transport channels to the data control unit 101. In
addition, the scheduling unit 104 maps uplink transport channels
and control data input from the data extraction unit 107 in uplink
logical channels after processing the uplink transport channels and
the control data as necessary, and then outputs the uplink logical
channels to the higher layer 108.
[0036] The channel estimation unit 105 estimates the uplink channel
state on the basis of uplink reference signals (for example, the
demodulation reference signal) in order to demodulate uplink data,
and then outputs the uplink channel state to the reception data
demodulation unit 106. In addition, the channel estimation unit 105
estimates the uplink channel state on the basis of uplink reference
signals (for example, a sounding reference signal) in order to
perform the uplink scheduling, and then outputs the uplink channel
state to the scheduling unit 104.
[0037] The reception data demodulation unit 106 demodulates
reception data. The reception data demodulation unit 106 performs a
demodulation process on the modulated data input from the radio
unit 103 by performing signal processing, such as a DFT transform,
subcarrier mapping, and an IFFT transform, on the basis of a result
of the estimation of the uplink channel state input from the
channel estimation unit 105. The reception data demodulation unit
106 then outputs the modulated data to the data extraction unit
107.
[0038] The data extraction unit 107 checks whether the reception
data input from the reception data demodulation unit 106 is correct
and outputs a result (for example, ACK or NACK) of the check to the
scheduling unit 104. In addition, the data extraction unit 107
divides the data input from the reception data demodulation unit
106 into transport channels and control data in the physical layer
and outputs the transport channels and the control data in the
physical layer to the scheduling unit 104.
[0039] The higher layer 108 performs processing in a radio resource
control (RRC) layer and processing in a MAC (media access control)
layer. The higher layer 108 includes interfaces between the higher
layer 108 and the scheduling unit 104, the antenna 109, the radio
unit 103, the channel estimation unit 105, the reception data
demodulation unit 106, the data control unit 101, the transmission
data modulation unit 102, and the data extraction unit 107, in
order to integrally control processing units in a lower layer.
[0040] FIG. 2 is a schematic block diagram illustrating the
configuration of the terminal according to the embodiment of the
present invention. The terminal is configured by including a data
control unit 201, a transmission data modulation unit 202, a radio
unit 203, a scheduling unit 204, a channel estimation unit 205, a
reception data demodulation unit 206, a data extraction unit 207, a
higher layer 208, and an antenna 209. In addition, the data control
unit 201, the transmission data modulation unit 202, the radio unit
203, the scheduling unit 204, the higher layer 208, and the antenna
209 configure a transmission section. In addition, the radio unit
203, the scheduling unit 204, the channel estimation unit 205, the
reception data demodulation unit 206, the data extraction unit 207,
the higher layer 208, and the antenna 209 configure a reception
section. Here, each component configuring the terminal will also be
referred to as a unit.
[0041] The data control unit 201 receives transport channels from
the scheduling unit 204. In addition, the data control unit 201
maps the transport channels and signals generated in the physical
layer in physical channels on the basis of scheduling information
input from the scheduling unit 204. Each piece of data mapped is
output to the transmission data modulation unit 202.
[0042] The transmission data modulation unit 202 modulates and
encodes transmission data. The transmission data modulation unit
202 generates the transmission data by performing signal
processing, such as modulation, encoding, serial-to-parallel
conversion of input signals, an IFFT process, and CP insertion, on
the data input from the data control unit 201 and outputs the
generated transmission data to the radio unit 203.
[0043] The radio unit 203 up-converts the transmission data input
from the transmission data modulation unit 202 into radio
frequencies to generate radio signals and transmits the radio
signals to the terminal through the antenna 209. In addition, the
radio unit 203 receives radio signals from the base station through
the antenna 209. The radio unit 203 then down-converts the radio
signals into baseband signals and outputs reception data to the
channel estimation unit 205 and the reception data demodulation
unit 206.
[0044] The scheduling unit 204, for example, maps logical channels
and transport channels and performs downlink and uplink scheduling.
The scheduling unit 204 includes interfaces between the scheduling
unit 204 and the antenna 209, the data control unit 201, the
transmission data modulation unit 202, the channel estimation unit
205, the reception data demodulation unit 206, the data extraction
unit 207, and the radio unit 203, in order to integrally control
processing units in the physical layer.
[0045] In addition, in the downlink scheduling, the scheduling unit
204 performs reception control in the transport channels and the
physical channels and generates scheduling information on the basis
of downlink control information received from the base station,
scheduling information input from the higher layer 208, and the
like. The scheduling information used for the downlink scheduling
is output to the data control unit 201.
[0046] In addition, in the uplink scheduling, the scheduling unit
204 performs a scheduling process for mapping the uplink logical
channels input from the higher layer 208 in the transport channels
and generates scheduling information used for the uplink scheduling
on the basis of downlink control information received from the base
station, the scheduling information input from the higher layer
208, and the like. The scheduling information is output to the data
control unit 201.
[0047] In addition, the scheduling unit 204 maps uplink logical
channels input from the higher layer 208 in the transport channels
and outputs the transport channels to the data control unit 201. In
addition, the scheduling unit 204 outputs, to the data control unit
201, channel state information input from the channel estimation
unit 205 and a result of a check of CRC (cyclic redundancy check)
parity bits (also referred to simply as a CRC) input from the data
extraction unit 207.
[0048] In addition, the scheduling unit 204 determines parameters
relating to the uplink reference signal and generates the uplink
reference signal using the determined parameters. That is, the
scheduling unit 204 generates the uplink reference signal on the
basis of enabled or disabled sequence group hopping. In addition,
the scheduling unit 204 generates the uplink reference signal on
the basis of enabled or disabled sequence hopping.
[0049] The channel estimation unit 205 estimates a downlink channel
state on the basis of downlink reference signals (for example, the
demodulation reference signal) in order to demodulate downlink
data, and then outputs the downlink channel state to the reception
data demodulation unit 206. In addition, the reception data
demodulation unit 206 demodulates the reception data input from the
radio unit 203 and outputs the demodulated reception data to the
data extraction unit 207.
[0050] The data extraction unit 207 checks whether the reception
data input from the reception data demodulation unit 206 is correct
and outputs a result (for example, ACK or NACK) of the check to the
scheduling unit 204. In addition, the data extraction unit 207
divides the reception data input from the reception data
demodulation unit 206 into transport channels and control data in
the physical layer and outputs the transport channels and the
control data in the physical layer to the scheduling unit 204.
[0051] The higher layer 208 performs processing in the radio
resource control layer and processing in the MAC layer. The higher
layer 208 includes interfaces between the higher layer 208 and the
scheduling unit 204, the antenna 209, the data control unit 201,
the transmission data modulation unit 202, the channel estimation
unit 205, the reception data demodulation unit 206, the data
extraction unit 207, and the radio unit 203, in order to integrally
control processing units in the lower layer.
[0052] FIG. 3 is a schematic diagram illustrating an example of
communication according to the embodiment of the present invention.
In FIG. 3, a terminal 303 communicates with a primary base station
301 and/or a second base station 302. In addition, a terminal 304
communicates with the primary base station 301 and/or the secondary
base station 302.
[0053] In FIG. 3, when transmitting an uplink signal to the base
station, the terminal multiplexes the demodulation reference signal
(DMRS), which is a signal known between the base station and the
terminal, with the uplink signal and transmits the uplink signal.
Here, the uplink signal includes uplink data (an uplink shared
channel (UL-SCH) or an uplink transport block). In addition, the
uplink signal includes uplink control information (UCI). Here, the
UL-SCH is a transport channel.
[0054] For example, the uplink data is mapped to a physical uplink
shared channel (PUSCH). In addition, the uplink control information
is mapped to the PUSCH or a physical uplink control channel
(PUCCH). That is, in the radio communication system, a demodulation
reference signal associated with transmission of the PUSCH
(transmission on the PUSCH) are supported. The demodulation
reference signal associated with the transmission of the PUSCH will
also be referred to as a first reference signal.
[0055] In addition, a random access preamble is mapped to a
physical random access channel (PRACH). When transmitting the
random access preamble to the base station apparatus, the terminal
transmits the random access preamble without multiplexing the
demodulation reference signal.
[0056] That is, the first reference signal is used for demodulating
the PUSCH. For example, the first reference signal is transmitted
in a resource block (also referred to as a physical resource block,
a physical resource, or a resource) to which a corresponding PUSCH
is mapped.
[0057] That is, the terminal 303 multiplexes the first reference
signal with the uplink signal to be transmitted to the primary base
station 301 and transmits the uplink signal to be through an uplink
305. In addition, the terminal 303 multiplexes the first reference
signal with the uplink signal transmitted to the secondary base
station 302 and transmits the uplink signal through an uplink 306.
In addition, the terminal 304 multiplexes the first reference
signal with the uplink signal to be transmitted to the primary base
station 301 and transmits the uplink signal through an uplink 307.
In addition, the terminal 304 multiplexes the first reference
signal with the uplink signal to be transmitted to the secondary
base station 302 and transmits the uplink signal through an uplink
308.
[0058] Here, if the first reference signal transmitted from the
terminal 303 and the first reference signal transmitted from the
terminal 304 have the same characteristics, interference
undesirably occurs. For example, if interference has occurred
between the first reference signals transmitted from a plurality of
terminals, an accuracy of estimating the states of channels, which
are used for demodulating the uplink signals, significantly
decreases.
[0059] Therefore, it is desirable to orthogonalize the first
reference signal transmitted from the terminal 303 and the first
reference signal transmitted from the terminal 304 to each other.
In addition, it is desirable to randomize the interference between
the first reference signal transmitted from the terminal 303 and
the first reference signal transmitted from the terminal 304.
[0060] In addition, in FIG. 3, an aggregation of a plurality of
serving cells (also referred to simply as cells) is supported in
the downlink and the uplink (referred to as a carrier aggregation
or a cell aggregation). For example, in each of the serving cells,
a transmission bandwidth of up to one hundred and ten resource
blocks may be used. Here, in the carrier aggregation, one of the
serving cells is defined as a primary cell (Pcell). In addition, in
the carrier aggregation, the serving cells other than the primary
cell are defined as secondary cells (Scells).
[0061] In addition, in the downlink, a carrier corresponding to the
serving cell is defined as a downlink component carrier (DLCC). In
addition, in the downlink, a carrier corresponding to the primary
cell is defined as a downlink primary component carrier (DLPCC). In
addition, in the downlink, a carrier corresponding to the secondary
cell is defined as a downlink secondary component carrier
(DLSCC).
[0062] Furthermore, in the uplink, a carrier corresponding to the
serving cell is defined as an uplink component carrier (ULCC). In
addition, in the uplink, a carrier corresponding to the primary
cell is defined as an uplink primary component carrier (ULPCC). In
addition, in the uplink, a carrier corresponding to the secondary
cell is defined as an uplink secondary component carrier
(ULSCC).
[0063] That is, in the carrier aggregation, a plurality of
component carriers are aggregated in order to support wide
transmission bandwidths. Here, for example, the primary base
station 301 may be regarded as a primary cell, and the secondary
base station 302 may be regarded as a secondary cell (the base
station configures to the terminal) (also referred to as HetNet
deployment with a carrier aggregation).
[0064] FIG. 4 is a diagram illustrating an example of downlink
signals. In FIG. 4, a resource region for a physical downlink
shared channel (PDSCH) to which downlink data (a downlink shared
channel (DL-SCH) or a downlink transport block) is mapped are
illustrated. Here, the DL-SCH is a transport channel.
[0065] In addition, a resource region for a physical downlink
control channel (PDCCH) to which downlink control information (DCI)
is mapped is illustrated. In addition, a resource region for an
E-PDCCH (an enhanced PDCCH) to which downlink control information
is mapped is illustrated.
[0066] For example, the PDCCH is mapped to first to third OFDM
symbols in a downlink resource region. In addition, the E-PDCCH is
mapped to fourth to twelfth OFDM symbols in the downlink resource
region. In addition, the E-PDCCH is mapped to a first slot and a
second slot in a subframe. In addition, the PDSCH and the E-PDCCH
are subjected to FDM (frequency-division multiplexing). In the
following description, the E-PDCCH is included in the PDCCH.
[0067] Here, the PDCCH is used for notifying (specifying) the
downlink control information to the terminal. In addition, a
plurality of formats are defined for the downlink control
information transmitted on the PDCCH. Here, the formats of the
downlink control information will also be referred to as DCI
formats.
[0068] For example, as DCI formats for the downlink, a DCI Format 1
and a DCI Format 1A, which are used for scheduling of the PDSCH
(transmission of a PDSCH codeword and a downlink transport block)
in a cell, are defined. In addition, as another DCI format for the
downlink, a DCI Format 2, which is used for scheduling of the PDSCH
(transmission of up to two PDSCH codewords and up to two downlink
transport blocks) in a cell, is defined.
[0069] For example, the DCI format for the downlink includes
downlink control information such as information regarding a
resource assignment of the PDSCH and information regarding an MCS
(modulation and coding scheme). A DCI format used for scheduling of
the PDSCH will also be referred to as a downlink assignment
hereinafter.
[0070] In addition, for example, as a DCI format for the uplink, a
DCI Format 0, which is used for scheduling of the PUSCH
(transmission of a PUSCH codeword and an uplink transport block) in
a cell, is defined. In addition, as another DCI format for the
uplink, a DCI Format 4, which is used for scheduling of the PUSCH
(transmission of up to two PUSCH codewords and up to two uplink
transport blocks) in a cell, is defined. That is, the DCI Format 4
is used for scheduling of transmission (transmission mode) on the
PUSCH using a plurality of antenna ports.
[0071] For example, the DCI format for the uplink includes downlink
control information such as information regarding a resource
assignment of the PUSCH and information regarding the MCS
(modulation and coding scheme). A DCI format used for scheduling of
the PUSCH will also be referred to as an uplink grant
hereinafter.
[0072] In addition, the PDSCH is used for transmitting downlink
data. Furthermore, the PDSCH is used for notifying (specifying) a
random access response grant to the terminal. Here, the random
access response grant is used for scheduling of the PUSCH. Here,
the random access response grant is indicated by a higher layer
(for example, the MAC layer) to a physical layer.
[0073] For example, the base station transmits a random access
response that is transmitted as Message 2 in a random access
procedure while including the random access response grant in the
random access response. In addition, the base station transmits the
random access response grant corresponding to Message 1 transmitted
from the terminal in the random access procedure. In addition, the
base station transmits the random access response grant for
transmitting a Message 3 in the random access procedure. That is,
the random access response grant may be used for scheduling of the
PUSCH for transmitting the Message 3 in the random access
procedure.
[0074] In FIG. 4, the terminal monitors a set of PDCCH candidates.
Here, the PDCCH candidates refer to candidates in which the PDCCHs
may possibly be allocated and transmitted by the base station. In
addition, the PDCCH candidates are made up of one or a plurality of
control channel elements (CCEs). In addition, the monitoring means
that the terminal attempts to decode on each of PDCCHs in the set
of PDCCH candidates according to all the monitored DCI formats.
Here, the set of PDCCH candidates monitored by the terminal will
also be referred to as a search space. That is, the search space
refers to a set of resources that can be used by the base station
for transmitting the PDCCH.
[0075] Furthermore, in the resource region for the PDCCH, a common
search space (CSS) and a UE-specific search space (USS; a
terminal-specific (terminal-unique) search space) are configured
(defined or set).
[0076] That is, in FIG. 4, the CSS and/or the USS are configured in
the resource region for the PDCCH. In addition, the CSS and/or the
USS are configured in the resource region for the E-PDCCH. The
terminal monitors the PDCCH in the CSS and/or the USS in the
resource region for the PDCCH and detects the PDCCH intended
therefor. In addition, the terminal monitors the E-PDCCH in the CSS
and/or the USS in the resource region for the E-PDCCH and detects
the E-PDCCH intended therefor.
[0077] Here, the CSS is used for transmitting downlink control
information intended for a plurality of terminals. That is, the CSS
is defined by a resource common to the plurality of terminals. For
example, the CSS is configured by CCEs having numbers predetermined
between the base station and the terminal. For example, the CSS is
configured by CCEs having indices of 0 to 15, respectively. Here,
the CSS may be used for transmitting downlink control information
intended for a certain terminal. That is, the base station
transmits, in the CSS, a DCI format intended for a plurality of
terminals and/or a DCI format intended for a certain terminal.
[0078] In addition, the USS is used for transmitting downlink
control information intended for a certain terminal. That is, the
USS is defined by resources dedicated to the certain terminal. That
is, the USS is independently defined for each terminal. For
example, the USS is configured by CCEs having numbers determined on
the basis of a radio network temporary identifier (RNTI) assigned
by the base station, a slot number in a radio frame, an aggregation
level, or the like. Here, RNTIs include a C-RNTI (cell RNTI) and a
temporary C-RNTI. That is, the base station transmits, in the USS,
a DCI Format intended for a certain terminal.
[0079] Here, an RNTI assigned by the base station to the terminal
is used for transmitting (transmission on the PDCCH) the downlink
control information. More specifically, a CRC (cyclic redundancy
check parity bits (also referred to simply as a CRC)) generated on
the basis of the downlink control information (may be a DCI format,
instead) are attached to the downlink control information and,
after the attachment, the CRC parity bits are scrambled by the
RNTI.
[0080] The terminal attempts to decode the downlink control
information with accompanying the CRC parity bits scrambled by the
RNTI and detects a PDCCH with which the CRC has been successful as
a PDCCH intended therefor (also referred to as blind decoding).
Here, the RNTI includes the C-RNTI and the temporary C-RNTI. That
is, the terminal decodes the PDCCH with the CRC scrambled by the
C-RNTI. In addition, the terminal decodes the PDCCH with the CRC
scrambled by the temporary C-RNTI.
[0081] Here, the C-RNTI is a unique identification used for
identifying an RRC (radio resource control) connection and
scheduling. For example, the C-RNTI is used for dynamically
scheduled unicast transmission.
[0082] In addition, the temporary C-RNTI is an identification used
for the random access procedure. Here, the base station transmits
the temporary C-RNTI while including the temporary C-RNTI in the
random access response. For example, the temporary C-RNTI is used,
in the random access procedure, for identifying a terminal that is
performing the random access procedure. In addition, the temporary
C-RNTI is used for a retransmission of the Message 3 in the random
access procedure. That is, in order for the terminal to retransmit
the Message 3, the base station transmits the downlink control
information on the PDCCH with the CRC scrambled by the temporary
C-RNTI. That is, the terminal changes its interpretation of the
downlink control information on the basis of which RNTI has been
used to scramble the CRC.
[0083] Here, for example, the terminal performs the random access
procedure in order to synchronize with the base station in a time
domain. In addition, the terminal performs the random access
procedure in order to realize initial connection establishment. In
addition, the terminal performs the random access procedure for a
handover. In addition, the terminal performs the random access
procedure in order to realize connection re-establishment. In
addition, the terminal performs the random access procedure in
order to request resources of the UL-SCH.
[0084] An example of the random access procedure will be described
hereinafter.
[0085] The terminal obtains SIB2 (System Information Block Type 2)
transmitted from the base station using the PDSCH. SIB2 is a
configuration (information) common to all terminals (may be a
plurality of terminals) in a cell. The common configuration
includes a configuration of the PRACH.
[0086] The terminal randomly selects a random access preamble
number. The terminal transmits the random access preamble (Message
1) having the selected number to the base station using the PRACH.
The base station receives the random access preamble using the
PRACH. The base station estimates an uplink transmission timing
using the random access preamble. The base station transmits the
random access response (Message 2) using the PDSCH. The random
access response includes a plurality of pieces of information for
the random access preamble detected by the base station. The
plurality of pieces of information include the random access
preamble number, the temporary C-RNTI, a TA command (timing advance
command), and the random access response grant. The TA command is
used for instructing the terminal to adjust the uplink transmission
timing. If the random access response includes the transmitted
random access preamble number, the terminal determines that the
random access response is intended therefor.
[0087] The terminal adjusts the uplink transmission timing on the
basis of the TA command included in the random access response. The
terminal transmits the uplink data (the Message 3) using the PUSCH
scheduled by the random access response grant. The uplink data
includes an identifier (information indicating an initial UE
identity or information indicating the C-RNTI) for identifying the
terminal. If the C-RNTI has been set, the terminal transmits the
uplink data while including the information indicating the C-RNTI
in the uplink data. If the C-RNTI has not been set, the terminal
transmits the uplink data while including the initial UE identity
in the uplink data. If S-TMSI (system architecture evolution
temporary mobile subscriber identity) has been provided, the
terminal sets the S-TMSI as the initial UE identity. In addition,
if S-TMSI has not been provided, the terminal randomly selects a
value from a range of values of 0 to 240-1 and sets the selected
value as the initial UE identity. The S-TMSI is an identifier used
for identifying the terminal in a tracking area.
[0088] If the base station has failed to decode the Message 3, the
base station can transmit, using PDCCH with the CRC scrambled by
the temporary C-RNTI, downlink control information for instructing
the terminal to retransmit the Message 3. Upon receiving, using the
PDCCH with the CRC scrambled by the temporary-CRNTI, the downlink
control information for instructing the terminal to retransmit the
Message 3, the terminal retransmits Message 3. On the other hand,
if the base station has failed to decode the Message 3, the base
station can transmit a NACK using a PHICH (a physical hybrid-ARQ
indicator channel). Upon receiving the NACK using the PHICH, the
terminal retransmits the Message 3.
[0089] The base station can detect which terminal has transmitted
the random access preamble and the Message 3 by successfully
decoding the Message 3 and obtaining Message 3. That is, before
successfully decoding the Message 3, the base station cannot detect
which terminal has transmitted the random access preamble and the
Message 3.
[0090] If the base station has received the initial UE identity,
the base station transmits a contention resolution identity
(Message 4) having the same value as the received initial UE
identity to the terminal using the PDCCH. If the value of the
received contention resolution identity and the value of the
transmitted initial UE identity match, the terminal (1) determines
that contention resolution of the random access preamble has been
successful, (2) sets the value of the temporary C-RNTI to the
C-RNTI, (3) discards the temporary C-RNTI, and (4) determines that
the random access procedure has been successfully completed.
[0091] If the base station has received the information indicating
the C-RNTI, the base station transmits downlink control information
(Message 4) to the terminal using PDCCH with the CRC scrambled by
the received C-RNTI. If the PDCCH with the CRC scrambled by the
C-RNTI have been decoded, the terminal (1) determines that
contention resolution of the random access preamble has been
successful, (2) discards the temporary C-RNTI, and (3) determines
that the random access procedure has been successfully
completed.
[0092] If the resources of the PDSCH are scheduled by the downlink
control information transmitted on the PDCCH, the terminal receives
downlink data on the scheduled PDSCH. On the other hand, if the
resources of the PUSCH are scheduled by the downlink control
information transmitted on the PDCCH, the terminal transmits uplink
data and/or uplink control information on the scheduled PUSCHs.
Here, the first reference signals are multiplexed with the uplink
data and/or the uplink control information transmitted on the
PUSCH.
[0093] In addition, the base station and the terminal transmit and
receive signals in the higher layer. For example, the base station
and the terminal transmit and receive a radio resource control
signal (also referred to as RRC signaling, RRC message, or RRC
information) in the RRC layer (Layer 3). Here, in the RRC layer, a
dedicated signal transmitted from the base station to a certain
terminal will also be referred to as a dedicated signal. That is,
the base station transmits a configuration (information) specific
(unique) to the certain terminal using the dedicated signal.
[0094] In addition, the base station and the terminal transmit and
receive a MAC control element in the MAC (media access control)
layer (Layer 2). Here, the RRC signaling and/or the MAC control
element will also be referred to as higher layer signaling.
[0095] An example of a method for generating a reference signal
sequence r.sup.(a).sub.u,v will be described hereinafter. Here, the
reference signal sequence is used for generating a sequence of the
first reference signal. For example, the reference signal sequence
is defined by a cyclic shift of a base sequence r.sup.-(a).sub.u,v
according to Expression 1.
r.sub.u,v.sup.(a)=e.sup.janr.sub.u,v(n),
0.ltoreq.n.ltoreq.M.sub.SC.sup.RS [Math. 1]
[0096] That is, the cyclic shift a is applied to the base sequence
to generate the reference signal sequence. In addition, multiple
reference signal sequences are defined from a single reference
sequence through different values of the cyclic shift z. Here,
M.sub.SC.sup.RS denotes the length of the reference signal
sequence, and, for example, M.sub.SC.sup.RS=mN.sub.SC.sup.RB. In
addition, N.sub.SC.sup.RB denotes the size of a resource block in a
frequency domain and, for example, indicated by the number of
subcarriers.
[0097] In addition, base sequences are divided into groups. That
is, the base sequences are indicated by a group number (also
referred to as a sequence group number) u and a base sequence
number v in the corresponding group. For example, the base
sequences are divided into thirty groups, and each group includes
two base sequences. In addition, a sequence group hopping is
applied to the thirty groups. In addition, a sequence hopping is
applied to the two base sequences.
[0098] Here, the sequence group number u and the base sequence
number v may change in time. In addition, the definition of the
base sequence depends on the sequence length M.sub.SC.sup.RS, and,
for example, the base sequence is given by Expression 2 if
M.sub.SC.sup.RS.gtoreq.3N.sub.SC.sup.RS.
r.sub.u,v(n)=x.sub.q(n mod N.sub.ZC.sup.RS),
0.ltoreq.n.ltoreq.M.sub.SC.sup.MS [Math. 2]
[0099] Here, a q-th route Zadoff-Chu sequence x.sub.q(m) is defined
by Expression 3.
x q ( m ) = e - j .pi. q m ( m + 1 ) N ZC RS , 0 .ltoreq. m
.ltoreq. N ZC RS - 1 [ Math . 3 ] ##EQU00001##
[0100] Here, q is given by Expression 4.
q=.left brkt-bot.q+1/2.right brkt-bot.+v(-1).sup..left
brkt-bot.2q.right brkt-bot.
q=N.sub.ZC.sup.RS(u+1)/31 [Math. 4]
[0101] Here, a length N.sub.ZC.sup.RS of the Zadoff-Chu sequence is
given by the largest prime number that satisfies
N.sub.ZC.sup.RS<M.sub.SC.sup.RS.
[0102] In addition, the sequence group number u in slot n.sub.s is
defined by a group hopping pattern f.sub.gh (n.sub.s) and a
sequence shift pattern f.sub.ss according to Expression 5.
u=(f.sub.gh(n.sub.s)+f.sub.ss)mod 30 [Math. 5]
[0103] Here, the base station can instruct the terminal to enable
or disable the sequence group hopping (also referred to simply as a
group hopping). If instructed by the base station to enable the
sequence group hopping, the terminal performs hopping on the groups
of the reference signal sequences in each slot. That is, the
terminal determines whether to perform hopping on the groups of the
reference signal sequences in each slot in accordance with enabling
or disabling of the sequence group hopping.
[0104] Here, for example, the group hopping pattern f.sub.gh
(n.sub.s) is given by Expression 6.
f gh ( n s ) = { 0 if group hopping is disabled ( i = 0 7 c ( 8 n s
+ i ) 2 i ) mod 30 if group hopping is enabled [ Math . 6 ]
##EQU00002##
[0105] Here, a pseudo-random sequence c(i) is defined by Expression
7. For example, the pseudo-random sequence is defined by a Gold
sequence having a length of 31 and given by Expression 7.
c(n)=(x.sub.1(n+N.sub.C)+x.sub.2(n+N.sub.C))mod 2
x.sub.1(n+31)=(x.sub.1(n+3)+x.sub.1(n))mod 2
x.sub.2(n+31)=(x.sub.2(n+3)+x.sub.2(n+2)+x.sub.2(n+1)+x.sub.2(n))mod
2 [Math. 7]
[0106] Here, for example, N.sub.c=1600. In addition, a first m
sequence x.sub.1 is initialized by x.sub.1(0)=1 and x.sub.1(n)=0,
where n=1, 2, . . . , and 30. In addition, a second m sequence
x.sub.2 is initialized by Expression 8.
c.sub.init=.SIGMA..sub.i=0.sup.30x.sub.2(i)2.sup.i [Math. 8]
[0107] Here, c.sub.init is defined by Expression 9. That is, the
pseudo-random sequence of the group hopping pattern
f.sub.gh(n.sub.s) is initialized by Expression 9.
c init = N ID cell 30 [ Math . 9 ] ##EQU00003##
[0108] Here, a physical layer cell identity N.sub.ID.sup.cell will
be described later. In addition, a sequence shift pattern
f.sub.ss.sup.PUSCH for the PUSCH is given by Expression 10.
f.sub.ss.sup.PUSCH=N.sub.ID.sup.cell mod 30
f.sub.ss.sup.PUSCH=(f.sub.ss.sup.PUSCH+.DELTA..sub.ss)mod 30 [Math.
10]
[0109] Here, a parameter .DELTA..sub.ss ss will be described
later.
[0110] In addition, the base sequence number v in the base sequence
group in the slot n.sub.s is defined by Expression 11. Here, the
sequence hopping may be applied only to a reference signal sequence
having a reference signal length equal to or larger than
6N.sub.SC.sup.RB. That is, the base sequence number v of the
reference signal sequence having the reference signal length of
smaller than 6N.sub.SC.sup.RB is given by v=0.
v = { c ( n s ) if group hopping is disabled and sequence hopping
is enabled 0 otherwise [ Math . 11 ] ##EQU00004##
[0111] Here, the base station can instruct the terminal to enable
or disable the sequence hopping. If instructed by the base station
to enable the sequence hopping, the terminal performs hopping on
the reference signal sequences in each group in each slot. That is,
the terminal determines whether to perform hopping on the reference
signal sequences in each slot in accordance with enabling or
disabling of the sequence hopping.
[0112] Here, the pseudo-random sequence c(i) is defined by
Expression 7 and Expression 8. In addition, c.sub.init is defined
by Expression 12. That is, the pseudo-random sequence of the
reference sequence number v is initialized by Expression 12.
c init = N ID cell 30 2 5 + f ss PUSCH [ Math . 12 ]
##EQU00005##
[0113] An example of a method for generating a sequence of the
first reference signals will be described hereinafter. That is, a
method for generating the demodulation reference signal for the
PUSCH will be described. For example, a demodulation reference
signal sequence .gamma..sup.(.lamda.).sub.PUSCH( ) for the PUSCH
associated with layer .lamda..di-elect cons.{0, 1, . . . , v-1} is
defined by Expression 13.
r.sub.PUSCH.sup.(.lamda.)(mM.sub.SC.sup.RS+n)=w.sup.(.lamda.)(m)r.sub.u,-
v.sup.(a.sup..lamda..sup.)(n) [Math. 13]
[0114] Here, .upsilon. denotes the number of transmission layers.
In addition, for example, .upsilon. is indicated by m=0 or 1. In
addition, .upsilon. is indicated by n=0, . . . , and
M.sub.SC.sup.RS-1. In addition, M.sub.SC.sup.RS=M.sub.SC.sup.PUSCH.
Here, M.sub.SC.sup.PUSCH denotes a bandwidth scheduled by the base
station for uplink transmission (transmission on the PUSCH) and,
for example, is indicated by the number of subcarriers.
Furthermore, w.sup.(.lamda.) (m) denotes an orthogonal
sequence.
[0115] In addition, a cyclic shift a.sub..lamda. in a slot n.sub.s
is given by a.sub.80 =2.pi.n.sub.cs,.lamda.. Here, n.sub.cs,.lamda.
is expressed by Expression 14. That is, the cyclic shift applied to
the first reference signal associated with the PUSCH is defined by
Expression 14.
n.sub.cs,.lamda.=(n.sub.DMRS.sup.(1)+n.sub.DMRS,.lamda..sup.(2)+n.sub.PN-
(n.sub.s))mod 12 [Math. 14]
[0116] Here, n.sup.(1).sub.DMRS is transmitted from the base
station apparatus using the higher layer signal. In addition,
n.sup.(2).sub.DMRS,.lamda. is indicated by the base station
apparatus using the DCI format. In addition, a quantity
n.sub.PN(ns) is given by Expression 15.
n.sub.PN(n.sub.s)=.SIGMA..sub.i=0.sup.7c(8N.sub.symb.sup.ULn.sub.s+i)2.s-
up.i [Math. 15]
[0117] Here, the pseudo-random sequence c (i) is defined by
Expression 7 and Expression 8. In addition, cinit is defined by
Expression 16. That is, the cyclic shift applied to the first
reference signal associated with the PUSCH is initialized by
Expression 16.
c init = N ID cell 30 2 5 + f ss PUSCH [ Math . 16 ]
##EQU00006##
[0118] Here, in the above expression, N.sub.ID.sup.cell denotes the
physical layer cell identity (also referred to as a physical layer
cell identifier). That is, N.sub.ID.sup.cell denotes identity
specific (unique) to the cell (base station). That is,
N.sub.ID.sup.cell denotes a physical layer identity of the cell.
For example, N.sub.ID.sup.cell may be N.sub.iD.sup.cell
corresponding to the primary cell.
[0119] For example, the terminal can detect N.sub.ID.sup.cell using
synchronization signals. In addition, the terminal can obtain
N.sub.ID.sup.cell from information included in the higher layer
signal (for example, a handover command) transmitted from the base
station.
[0120] In addition, in the above expression, for example, the
parameter .DELTA..sub.ss is indicated by .DELTA..sub.ss.di-elect
cons.{0, 1, . . . , 29}. Here, the parameter .DELTA..sub.ss is a
parameter specific to the cell (base station). For example, the
terminal can receive the parameter .DELTA..sub.ss using SIB2
(System Information Block Type 2). Here, SIB2 is a configuration
(information) common to all terminals (may be a plurality of
terminals) in a cell. That is, the parameter .DELTA..sub.ss is
specified for the terminal using the information common to all the
terminals in the cell.
[0121] FIG. 5 is a flowchart illustrating the embodiment. As
described above, the base station can instruct the terminal to
enable or disable the sequence group hopping of the reference
signal sequence.
[0122] Here, as information for instructing the terminal to enable
or disable the sequence group hopping, a first parameter (also
referred to as group-hopping-enabled) may be used. That is, the
first parameter is used for determining whether the sequence group
hopping is enabled. In addition, as information for instructing the
terminal to disable the sequence group hopping, a second parameter
(also referred to as disable-sequence-hopping) may be used. That
is, the second parameter is used for determining whether the
sequence group hopping is disabled. Here, the second parameter
cannot instruct the terminal to enable the sequence group
hopping.
[0123] Here, the first parameter is configured in a cell-specific
manner. For example, the first parameter is transmitted using SIB2
(System Information Block Type 2). Here, SIB2 is a configuration
(information) common to all the terminals (may be a plurality of
terminals) in the cell. That is, the first parameter is a
cell-specific parameter. Here, the first parameter will also be
described as a cell-specific parameter.
[0124] On the other hand, the second parameter is configured in a
terminal-specific (UE-specific) manner. For example, the second
parameter is configured using the dedicated signal. Alternatively,
the second parameter may be indicated using downlink control
information included in a DCI format. That is, the second parameter
is a terminal-specific parameter (a UE-specific parameter). The
second parameter will also be described as a UE-specific parameter
hereinafter.
[0125] Here, for example, the base station can instruct the
terminal to disable the sequence group hopping by transmitting the
dedicated signal while including the second parameter in the
dedicated signal. That is, the base station can instruct the
terminal to disable the sequence group hopping by transmitting the
second parameter to the terminal. If the dedicated signal includes
the second parameter, the terminal disables the sequence group
hopping.
[0126] In addition, even though the sequence group hopping is
enabled using the first parameter, the base station can disable the
sequence group hopping using the second parameter. That is, for
example, the second parameter is used for disabling the sequence
group hopping for a certain terminal even though the sequence group
hopping is enabled in the cell-specific manner.
[0127] A method for determining whether to enable or disable the
sequence group hopping by the terminal will be described with
reference to FIG. 5. In FIG. 5, the terminal identifies the first
parameter transmitted from the base station (step 501). Here, in a
case that the disabling of the sequence group hopping is configured
(disable), the terminal disables the sequence group hopping and
generates the first reference signal. In addition, the terminal
transmits the generated first reference signal.
[0128] In addition, in a case that it is determined as a result of
the identification of the first parameter transmitted from the base
station that the enabling of the sequence group hopping is
configured (enable), the terminal identifies the second parameter.
That is, for example, the terminal identifies whether the second
parameter is configured (step 502). Here, in a case that the second
parameter is not configured (for example, if the second parameter
is not received using the dedicated signal) (NO), the terminal
enables the sequence group hopping and generates the first
reference signal. In addition, the terminal transmits the generated
first reference signal.
[0129] Furthermore, in a case that the second parameter is
configured (for example, in a case that the second parameter is
received using the dedicated signal) (YES), the terminal identifies
the DCI format (step 503). That is, the terminal identifies the DCI
format used for scheduling of the corresponding PUSCH
transmission.
[0130] Here, in a case that the DCI format is not identified
(detected or received), the terminal enables the sequence group
hopping and generates the first reference signal. In addition, the
terminal transmits the generated first reference signal.
[0131] Here, in a case that the DCI Format 4 is identified
(detected or received) (DCI FORMAT 4), the terminal disables the
sequence group hopping and generates the first reference signal. In
addition, the terminal transmits the generated first reference
signal. Here, for example, the DCI Format 4 is transmitted only in
the USS. That is, in a case that the DCI format transmitted only in
the USS is identified, the terminal disables the sequence group
hopping and generates the first reference signal.
[0132] On the other hand, in a case that the DCI Format 0 is
identified (detected or received) (DCI FORMAT 0), the terminal
identifies the RNTI by which the CRC is scrambled (step 504). Here,
for example, the DCI Format 0 is transmitted in the CSS and/or the
USS. That is, in a case that the DCI format that is possible to be
transmitted in the CSS is identified, the terminal identifies the
RNTI. The DCI Format 0 will also be described as a predetermined
downlink information format hereinafter. In addition, the DCI
Format 4 will also be described as a downlink information format
other than the predetermined downlink information format.
[0133] Here, the DCI format received by the terminal refers to a
DCI format including most recent uplink-related DCI for a transport
block associated with the corresponding PUSCH transmission.
[0134] In addition, in the case that the DCI format is not
received, the terminal does not receive any DCI format for the
transport block associated with the corresponding PUSCH
transmission. For example, in a case that an initial transmission
of the transport block scheduled by the random access response
grant is performed, there is no DCI format for the transport block
transmitted using the PUSCH. In addition, in a case that the DCI
format indicating a retransmission of the transport block is not
received and the transport block is retransmitted in accordance
with NACK received using the PHICH (the physical hybrid-ARQ
indicator channel), there is no DCI format for the transport block
transmitted using the PUSCH.
[0135] Here, the PHICH is a channel used for transmitting
information indicating ACK/NACK (also referred to as ACK/NACK in
HARQ) in response to uplink data. The base station transmits, using
the PHICH, the information indicating ACK/NACK in response to the
uplink data transmitted from the terminal.
[0136] In addition, in a case that the CRC is scrambled by the
C-RNTI (C-RNTI), the terminal disables the sequence group hopping
and generates the first reference signal. In addition, the terminal
transmits the generated first reference signal. Here, in a case
that the CRC is scrambled by the temporary C-RNTI (TEMPORARY
C-RNTI), the terminal enables the sequence group hopping and
generates the first reference signal. In addition, the terminal
transmits the generated first reference signal.
[0137] Here, the RNTI by which the CRC is scrambled refers to RNTI
used for transmitting the most recent uplink-related DCI for the
transport block associated with the corresponding PUSCH
transmission.
[0138] That is, the terminal can enable or disable the sequence
group hopping on the basis of the cell-specific parameter, the
terminal-specific parameter, the DCI format, and/or the RNTI.
[0139] That is, the terminal determines whether to follow the
cell-specific parameter or the terminal-specific parameter on the
basis of the DCI format and/or the RNTI by which the CRC is
scrambled.
[0140] That is, even though the sequence group hopping is disabled
in the terminal-specific manner, the first parameter may be used
for enabling or disabling the sequence group hopping in a case that
the PUSCH for the transport block is scheduled by the random access
response grant and the uplink grant for the transport block is not
received.
[0141] In addition, even though the sequence group hopping is
disabled in the terminal-specific manner, the first parameter may
be used for enabling or disabling the sequence group hopping in a
case that the temporary C-RNTI is used for transmitting the most
recent uplink-related DCI for the transport block associated with
the corresponding PUSCH transmission.
[0142] That is, even though the sequence group hopping is disabled
in the terminal-specific manner, the first parameter may be used
for enabling or disabling the sequence group hopping in a case that
a transmission of the Message 3 is performed.
[0143] In addition, even though the sequence group hopping is
enabled in the cell-specific manner, the second parameter may be
used for disabling the sequence group hopping for a certain
terminal in a case that the C-RNTI is used for transmitting the
most recent uplink-related DCI for the transport block associated
with the corresponding PUSCH transmission. That is, the second
parameter may be used for disabling the sequence group hopping for
a certain terminal in a case that a transmission of the uplink data
other than the Message 3 is performed.
[0144] In addition, the base station can instruct the terminal to
enable or disable the sequence hopping of the reference signal
sequences.
[0145] Here, as the information for instructing the terminal to
enable or disable the sequence hopping, a third parameter (also
referred to as sequence-hopping-enabled) may be used. That is, the
third parameter is used for determining whether to enable the
sequence hopping.
[0146] In addition, as the information for instructing the terminal
to disable the sequence hopping, the above-described second
parameter (disable-sequence-hopping) may be used. That is, the
second parameter is used for determining whether to disable the
sequence hopping. That is, the second parameter is used for
determining whether to disable the sequence group hopping and the
sequence hopping. Here, the second parameter cannot instruct the
terminal to enable the sequence hopping. In addition, the sequence
hopping can be enabled using the second parameter only if the
sequence group hopping is disabled.
[0147] Here, the third parameter is configured in the cell-specific
manner. For example, the third parameter is transmitted using SIB2
(System Information Block Type 2). That is, the third parameter is
the cell-specific parameter.
[0148] Here, even though the sequence hopping is enabled using the
third parameter, the base station can disable the sequence hopping
using the second parameter. That is, the second parameter may be
used for disabling the sequence hopping for a certain terminal even
though the sequence hopping is enabled in the cell-specific
manner.
[0149] A method for determining whether to enable or disable the
sequence hopping using the terminal will be described with
reference to FIG. 5. In FIG. 5, the terminal identifies the third
parameter transmitted from the base station (step 501). Here, in a
case that the disabling of the sequence group hopping is configured
(disable), the terminal disables the sequence group hopping and
generates the first reference signal. In addition, the terminal
transmits the generated first reference signal.
[0150] In addition, in a case that it is determined as a result of
the identification of the first parameter transmitted from the base
station that the enabling of the sequence group hopping is
configured (enable), the terminal identifies the second parameter.
That is, for example, the terminal identifies whether the second
parameter is configured (step 502). Here, in a case that the second
parameter is not configured (for example, in a case that the second
parameter is not received using the dedicated signal) (NO), the
terminal enables the sequence hopping and generates the first
reference signal. In addition, the terminal transmits the generated
first reference signal.
[0151] Furthermore, in a case that the second parameter is
configured (for example, in a case that the second parameter is
received using dedicated signal) (YES), the terminal identifies the
DCI format (step 503). That is, the terminal identifies the DCI
format used for scheduling of the corresponding PUSCH
transmission.
[0152] Here, in a case that the DCI format is not identified
(detected or received), the terminal enables the sequence hopping
and generates the first reference signal. In addition, the terminal
transmits the generated first reference signal.
[0153] Here, in a case that the DCI Format 4 is identified
(detected or received) (DCI FORMAT 4), the terminal disables the
sequence hopping and generates the first reference signal. In
addition, the terminal transmits the generated first reference
signal. Here, for example, the DCI Format 4 is transmitted only in
the USS. That is, in a case that the DCI format transmitted only in
the USS is identified, the terminal disables the sequence hopping
and generates the first reference signal.
[0154] On the other hand, in a case that the DCI Format 0 is
identified (detected or received) (DCI FORMAT 0), the terminal
identifies the RNTI by which the CRC is scrambled (step 504). Here,
for example, the DCI Format 0 is transmitted in the CSS and/or the
USS. That is, in a case that the DCI format that is possible to be
transmitted in the CSS is identified, the terminal identifies the
RNTI. Here, the DCI Format 0 will also be described as a
predetermined downlink information format. In addition, the DCI
Format 4 will also be described as a downlink information format
other than the predetermined downlink information format.
[0155] Here, the DCI format received by the terminal refers to a
DCI format including the most recent uplink-related DCI for the
transport block associated with the corresponding PUSCH
transmission.
[0156] In addition, in the case that the DCI format, the terminal
does not receive any DCI format for the transport block associated
with the corresponding PUSCH transmission. For example, in a case
that an initial transmission of the transport block scheduled by
the random access response grant is performed, there is no DCI
format for the transport block transmitted using the PUSCH. In
addition, in a case that the DCI format indicating a retransmission
of the transport block is not received and the transport block is
retransmitted in accordance with NACK received using PHICH, there
is no DCI format for the transport block transmitted using the
PUSCH.
[0157] In addition, in a case that the CRC is scrambled by the
C-RNTI (C-RNTI), the terminal disables the sequence hopping and
generates the first reference signal. In addition, the terminal
transmits the generated first reference signal. Here, in a case
that the CRC is scrambled by the temporary C-RNTI (TEMPORARY
C-RNTI), the terminal enables the sequence hopping and generates
the first reference signal. In addition, the terminal transmits the
generated first reference signal.
[0158] Here, the RNTI by which the CRC is scrambled refers to RNTI
used for transmitting the most recent uplink-related DCI for the
transport block associated with the corresponding PUSCH
transmission.
[0159] That is, the terminal can enable or disable the sequence
group hopping on the basis of the cell-specific parameter, the
terminal-specific parameter, the DCI format, and/or the RNTI.
[0160] That is, the terminal determines whether to follow the
cell-specific parameter or the terminal-specific parameter on the
basis of the DCI format and/or the RNTI by which the CRC is
scrambled.
[0161] That is, even though the sequence hopping is disabled in the
terminal-specific manner, the third parameter may be used for
enabling or disabling the sequence hopping in a case that the PUSCH
for the transport block is scheduled by the random access response
grant and the uplink grant for the transport block is not
received.
[0162] In addition, even though the sequence hopping is disabled in
the terminal-specific manner, the third parameter may be used for
enabling or disabling the sequence hopping in a case that the
temporary C-RNTI is used for transmitting the most recent
uplink-related DCI for the transport block associated with the
corresponding PUSCH transmission.
[0163] That is, even though the sequence hopping is disabled in the
terminal-specific manner, the third parameter may be used for
enabling or disabling the sequence hopping in a case that a
transmission of the Message 3 is performed.
[0164] In addition, even though the sequence hopping is enabled in
the cell-specific manner, the second parameter may be used for
disabling the sequence hopping for a certain terminal in a case
that the C-RNTI is used for transmitting the most recent
uplink-related DCI for the transport block associated with the
corresponding PUSCH transmission. That is, the second parameter may
be used for disabling the sequence hopping for a certain terminal
in a case that a transmission of the uplink data other than the
Message 3 is performed.
[0165] Using the above-described method, the terminal determines
whether to enable or disable the sequence group hopping and the
sequence hopping on the basis of the cell-specific first parameter
and the cell-specific third parameter in the case that the Message
3 is to be transmitted. That is, even though the sequence group
hopping and the sequence hopping are disabled by the
terminal-specific second parameter, in case of transmitting the
Message 3, the terminal determines whether to enable or disable the
sequence group hopping and the second hopping on the basis of the
cell-specific first parameter and the cell-specific third
parameter.
[0166] In addition, in case of transmitting the uplink data other
than the Message 3, the terminal determines whether the sequence
group hopping and the sequence hopping are disabled on the basis of
the terminal-specific second parameter. As a result, even though
the base station does not identify which terminal has transmitted
the Message 3, the base station can determine whether the terminal
has disabled the sequence group hopping or the sequence hopping on
the basis of the cell-specific first parameter and the
cell-specific second parameter. Therefore, the base station can
correctly receive Message 3.
[0167] The above-described method enables, for example,
transmission and reception of the uplink reference signal while
switching the sequences more elastically. In addition, the
above-described method enables transmission and reception of the
uplink reference signal while switching the sequences more
dynamically.
[0168] When the base station switches the sequence group hopping
and/or the sequence hopping in the above-described manner, it is
possible to elastically control transmission of the uplink
reference signals transmitted by a plurality of terminals.
[0169] Programs operating on a primary base station, a secondary
base station, and a terminal according to the present invention are
programs (programs that causes computers to function) that control
CPUs or the like in such a way as to realize the functions of the
above embodiment of the present invention. Information handled by
these apparatuses is temporarily accumulated in RAMs during
processing, and then stored in various ROMs or HDDs and read,
corrected, and written by the CPUs as necessary. As recording media
that store the programs, any of semiconductor media (for example,
ROMs, nonvolatile memory cards, and the like), optical recording
media (for example, DVDs, MOs, MDs, CDs, BDs, and the like),
magnetic recording media (for example, magnetic tapes, flexible
disks, and the like), and the like may be used. In addition, the
functions of the above-described embodiment may be realized not
only by executing the loaded programs but also by performing
processing in combination with operating systems, other application
programs, or the like on the basis of instructions from the
programs.
[0170] In addition, when the programs are to be distributed to the
market, the programs may be stored in portable recording media and
distributed or 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 present invention.
Alternatively, part or all of the primary base station, the
secondary base station, and the terminal in the above-described
embodiment may be realized as LSI, which is typically integrated
circuits. Here, each function block of the primary base station,
the secondary base station, and the terminal may be individually
realized as a chip, or part or all of the function blocks may be
integrated and realized as a chip. In addition, a method for
realizing the function blocks as integrated circuits is not limited
to the LSI, but may be realized by dedicated circuits or
general-purpose processors. In addition, if a technology for
realizing the function blocks as integrated circuits that replaces
the LSI has been developed as a result of the evolution of
semiconductor technologies, integrated circuits realized by the
technology may be used.
[0171] As described above, the embodiment may adopt the following
modes. That is, a mobile station apparatus that communicates with a
base station apparatus receives, from the base station apparatus, a
cell-specific parameter and a user-equipment-specific parameter for
indicating enabling or disabling of a sequence group hopping, and
transmits, to the base station apparatus, a reference signal
generated by enabling the sequence group hopping in a case that
enabling is indicated by the cell-specific parameter, disabling is
indicated by the user-equipment-specific parameter, and there is no
downlink control information format for a transport block to be
transmitted.
[0172] In addition, a mobile station apparatus that communicates
with a base station apparatus receives, from the base station
apparatus, a cell-specific parameter and a user-equipment-specific
parameter for indicating enabling or disabling of a sequence group
hopping, and transmits, to the base station apparatus, a reference
signal generated by enabling the sequence hopping in a case that
enabling is indicated by the cell-specific parameter, disabling is
indicated by the user-equipment-specific parameter, and a
predetermined downlink control information format with a CRC
scrambled by a temporary C-RNTI is received.
[0173] In addition, a base station apparatus that communicates with
a mobile station apparatus transmits, to the mobile station
apparatus, a cell-specific parameter and a user-equipment-specific
parameter for indicating enabling or disabling of a sequence group
hopping, and receives, from the mobile station apparatus, a
reference signal generated by enabling the sequence hopping in a
case that enabling is indicated by the cell-specific parameter,
disabling is indicated by the user-equipment-specific parameter,
and there is no downlink control information format for a transport
block to be transmitted by the mobile station apparatus.
[0174] In addition, a base station apparatus that communicates with
a mobile station apparatus transmits, to the mobile station
apparatus, a cell-specific parameter and a user-equipment-specific
parameter for indicating enabling or disabling of a sequence group
hopping, and receives, from the mobile station apparatus, a
reference signal generated by enabling the sequence hopping in a
case that enabling is indicated by the cell-specific parameter,
disabling is indicated by the user-equipment-specific parameter,
and a predetermined downlink control information format with a CRC
scrambled by a temporary C-RNTI is transmitted.
[0175] In addition, in a communication method used by a mobile
station apparatus that communicates with a base station apparatus,
the mobile station apparatus receives, from the base station
apparatus, a cell-specific parameter and a user-equipment-specific
parameter for indicating enabling or disabling of a sequence group
hopping, and transmits, to the base station apparatus, a reference
signal generated by enabling the sequence group hopping in a case
that enabling is indicated by the cell-specific parameter,
disabling is indicated by the user-equipment-specific parameter,
and there is no downlink control information format for a transport
block to be transmitted.
[0176] In addition, in a communication method used by a mobile
station apparatus that communicates with a base station apparatus,
the mobile station apparatus receives, from the base station
apparatus, a cell-specific parameter and a user-equipment-specific
parameter for indicating enabling or disabling of a sequence group
hopping, and transmits, to the base station apparatus, a reference
signal by enabling the sequence group hopping in a case that
enabling is indicated by the cell-specific parameter, disabling is
indicated by the user-equipment-specific parameter, and a
predetermined downlink control information format with a CRC
scrambled by a temporary C-RNTI is received.
[0177] In addition, in a communication method used by a base
station apparatus that communicates with a mobile station
apparatus, the base station apparatus transmits, to the mobile
station apparatus, a cell-specific parameter and a
user-equipment-specific parameter for indicating enabling or
disabling of a sequence group hopping, and receives, from the
mobile station apparatus, a reference signal generated by enabling
the sequence group hopping in a case that enabling is indicated by
the cell-specific parameter, disabling is indicated by the
user-equipment-specific parameter, and there is no downlink control
information format for a transport block to be transmitted by the
mobile station apparatus.
[0178] In addition, in a communication method used by a base
station apparatus that communicates with a mobile station
apparatus, the base station apparatus transmits, to the mobile
station apparatus, a cell-specific parameter and a
user-equipment-specific parameter for indicating enabling or
disabling of a sequence group hopping, and receives, from the
mobile station apparatus, a reference signal generated by enabling
the sequence group hopping in a case that enabling is indicated by
the cell-specific parameter, disabling is indicated by the
user-equipment-specific parameter, and a predetermined downlink
control information format with a CRC scrambled by a temporary
C-RNTI is transmitted.
[0179] In addition, an integrated circuit mounted on a mobile
station apparatus that communicates with a base station apparatus
causes the mobile station apparatus to realize a function of
receiving, from the base station apparatus, a cell-specific
parameter and a user-equipment-specific parameter for indicating
enabling or disabling of a sequence group hopping , and a function
of transmitting, to the base station apparatus, a reference signal
generated by enabling the sequence group hopping in a case that
enabling is indicated by the cell-specific parameter, disabling is
indicated by the user-equipment-specific parameter, and there is no
downlink control information format for a transport block to be
transmitted.
[0180] In addition, an integrated circuit mounted on a mobile
station apparatus that communicates with a base station apparatus
causes the mobile station apparatus to realize a function of
receiving, from the base station apparatus, a cell-specific
parameter and a user-equipment-specific parameter for indicating
enabling or disabling of a sequence group hopping, and a function
of transmitting, to the base station apparatus, a reference signal
generated by enabling the sequence group hopping in a case that
enabling is indicated by the cell-specific parameter, disabling is
indicated by the user-equipment-specific parameter, and a
predetermined downlink control information format with a CRC
scrambled by a temporary C-RNTI is received.
[0181] In addition, an integrated circuit mounted on a base station
apparatus that communicates with a mobile station apparatus causes
the base station apparatus to realize a function of transmitting,
to the base station apparatus, a cell-specific parameter and a
user-equipment-specific parameter for indicating enabling or
disabling of a sequence group hopping, and a function of receiving,
from the mobile station apparatus, a reference signal generated by
enabling the sequence group hopping in a case that enabling is
indicated by the cell-specific parameter, disabling is indicated by
the user-equipment-specific parameter, and there is no downlink
control information format for a transport block to be transmitted
by the mobile station apparatus.
[0182] In addition, an integrated circuit mounted on a base station
apparatus that communicates with a mobile station apparatus causes
the base station apparatus to realize a function of transmitting,
to the mobile station apparatus, a cell-specific parameter and a
user-equipment-specific parameter for indicating enabling or
disabling of a sequence group hopping, and a function of receiving,
from the mobile station apparatus, a reference signal generated by
enabling the sequence group hopping in a case that enabling is
indicated by the cell-specific parameter, disabling is indicated by
the user-equipment-specific parameter, and a predetermined downlink
control information format with a CRC scrambled by a temporary
C-RNTI is transmitted.
[0183] In addition, in a radio communication system in which a base
station apparatus and a mobile station apparatus communicate with
each other, the base station apparatus transmits, to the mobile
station apparatus, a cell-specific parameter and a
user-equipment-specific parameter for indicating enabling or
disabling of a sequence group hopping, the mobile station apparatus
transmits, to the base station apparatus, a reference signal
generated by enabling the sequence group hopping in a case that
enabling is indicated by the cell-specific parameter, disabling is
indicated by the user-equipment-specific parameter, and a
predetermined downlink control information format with a CRC
scrambled by a temporary C-RNTI is received.
[0184] Although the embodiment of the present invention has been
described in detail with reference to the drawings, specific
configurations are not limited to this embodiment, and design
changes and the like that do not deviate from the scope of the
present invention are also included. In addition, the present
invention may be modified in various ways within the range defined
in the claims, and embodiments obtained by appropriately combining
technical means disclosed in different embodiments are also
included in the technical scope of the present invention. In
addition, configurations obtained by replacing elements that have
been described in the embodiment and that produce the same
advantageous effects are also included.
INDUSTRIAL APPLICABILITY
[0185] The present invention may be desirably applied to a mobile
station apparatus, a base station apparatus, a communication
method, a radio communication system, and an integrated
circuit.
REFERENCE SIGNS LIST
[0186] 100 base station
[0187] 101 data control unit
[0188] 102 transmission data modulation unit
[0189] 103 radio unit
[0190] 104 scheduling unit
[0191] 105 channel estimation unit
[0192] 106 reception data demodulation unit
[0193] 107 data extraction unit
[0194] 108 higher layer
[0195] 109 antenna
[0196] 200 terminal
[0197] 201 data control unit
[0198] 202 transmission data modulation unit
[0199] 203 radio unit
[0200] 204 scheduling unit
[0201] 205 channel estimation unit
[0202] 206 reception data demodulation unit
[0203] 207 data extraction unit
[0204] 208 higher layer
[0205] 209 antenna
[0206] 301 primary base station
[0207] 302 secondary base station
[0208] 303, 304 terminal
[0209] 305, 306, 307, 308 uplink
* * * * *