U.S. patent application number 16/804798 was filed with the patent office on 2020-06-25 for terminal apparatus and base station apparatus.
This patent application is currently assigned to SHARP KABUSHIKI KAISHA. The applicant listed for this patent is SHARP KABUSHIKI KAISHA. Invention is credited to Tatsushi AIBA, Kimihiko IMAMURA, Wataru OUCHI, Shoichi SUZUKI, Hiroki TAKAHASHI, Kazunari YOKOMAKURA.
Application Number | 20200204415 16/804798 |
Document ID | / |
Family ID | 52461238 |
Filed Date | 2020-06-25 |
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United States Patent
Application |
20200204415 |
Kind Code |
A1 |
SUZUKI; Shoichi ; et
al. |
June 25, 2020 |
TERMINAL APPARATUS AND BASE STATION APPARATUS
Abstract
First information indicating a length of a cyclic prefix for an
inter-terminal apparatus signal transmitted to the other terminal
apparatus and second information indicating a length of a cyclic
prefix for an uplink signal in the EUTRAN, from a base station
apparatus of the EUTRAN are received from a base station apparatus
of the EUTRAN.
Inventors: |
SUZUKI; Shoichi; (Sakai
City, JP) ; AIBA; Tatsushi; (Sakai City, JP) ;
YOKOMAKURA; Kazunari; (Sakai City, JP) ; TAKAHASHI;
Hiroki; (Sakai City, JP) ; OUCHI; Wataru;
(Sakai City, JP) ; IMAMURA; Kimihiko; (Sakai City,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SHARP KABUSHIKI KAISHA |
Sakai City |
|
JP |
|
|
Assignee: |
SHARP KABUSHIKI KAISHA
Sakai City
JP
|
Family ID: |
52461238 |
Appl. No.: |
16/804798 |
Filed: |
February 28, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15914839 |
Mar 7, 2018 |
10587441 |
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16804798 |
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15593071 |
May 11, 2017 |
10063400 |
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15914839 |
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14419466 |
Feb 3, 2015 |
9680679 |
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PCT/JP2014/069921 |
Jul 29, 2014 |
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15593071 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 76/50 20180201;
H04L 27/2607 20130101; H04W 72/042 20130101; H04L 5/14 20130101;
H04W 92/18 20130101; H04W 88/08 20130101; H04W 8/005 20130101; H04W
72/0413 20130101; H04W 76/14 20180201; H04W 16/14 20130101 |
International
Class: |
H04L 27/26 20060101
H04L027/26; H04W 76/14 20060101 H04W076/14; H04W 16/14 20060101
H04W016/14; H04W 8/00 20060101 H04W008/00; H04W 72/04 20060101
H04W072/04; H04W 76/50 20060101 H04W076/50; H04L 5/14 20060101
H04L005/14 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 6, 2013 |
JP |
2013-163099 |
Claims
1. A terminal apparatus configured to communicate with a network
apparatus, the terminal apparatus comprising: reception circuitry
configured and/or programmed to receive first information in a
downlink, the first information indicating a first set of resources
for a first communication which is a mode of communication whereby
the terminal device and another terminal device can communicate
with each other directly; and transmission circuitry configured
and/or programmed to transmit second information in an uplink, the
second information including information indicating a buffer status
report for the first communication.
2. A network apparatus configured to communicate with a terminal
apparatus, the network apparatus comprising: transmission circuitry
configured and/or programmed to transmit first information in a
downlink, the first information indicating a first set of resources
for a first communication which is a mode of communication whereby
the terminal device and another terminal device can communicate
with each other directly; and reception circuitry configured and/or
programmed to receive second information in an uplink, the second
information including information indicating a buffer status report
for the first communication.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a Continuation of co-pending U.S.
application Ser. No. 15/914,839 filed Mar. 7, 2018, which is a
Continuation of U.S. application Ser. No. 15/593,071 filed on May
11, 2017 (now U.S. Pat. No. 10,063,400 issued on Aug. 28, 2018),
which is a Continuation of U.S. application Ser. No. 14/419,466
filed on Feb. 3, 2015 (now U.S. Pat. No. 9,680,679 issued on Jun.
13, 2017), which is a National Phase of PCT/JP2014/069921 filed on
Jul. 29, 2014, which claims priority under 35 U.S.C. .sctn. 119(a)
to Japanese Patent Application No. 2013-163099 filed in Japan on
Aug. 6, 2013, all of which are hereby expressly incorporated by
reference to the present application.
TECHNICAL FIELD
[0002] The present invention relates to a terminal apparatus and a
base station apparatus.
[0003] This application is based upon and claims the benefit of
priority from the Japanese Patent Application No. 2013-163099,
filed on Aug. 6, 2013, the entire content of which is incorporated
herein by reference.
BACKGROUND ART
[0004] Evolved Universal Terrestrial Radio Access (EUTRA) and
Evolved Universal Terrestrial Radio Access Network (EUTRAN) for
cellular mobile communication have been studied in the 3rd
Generation Partnership Project (3GPP). The EUTRA and the EUTRAN are
called Long term Evolution (LTE). In the LTE, a base station
apparatus is called evolved NodeB (eNodeB), and a terminal
apparatus is called User Equipment (UE). The LTE is a cellular
communication system in which an area covered by the base station
apparatus is arranged cellularly at multiple locations. A single
base station apparatus may manage multiple cells.
[0005] In the 3GPP, Proximity Services (ProSe) are studied. The
ProSe includes ProSe discovery and ProSe communication. The ProSe
discovery is a process which uses the EUTRA so as to specify that
one terminal apparatus is in proximity to the other terminal
apparatus. The ProSe communication is communication between two
terminal apparatuses in proximity to each other, which uses a
EUTRAN communication path established between two terminal
apparatuses. For example, the communication path may be directly
established between the terminal apparatuses.
[0006] The ProSe discovery and the ProSe communication are
respectively called D2D discovery and D2D communication. The D2D
discovery and the D2D communication are collectively called
D2D.
[0007] NPL 1 describes that a subset of resource blocks is reserved
for the D2D, that a network configures a set of D2D resources, and
that a terminal apparatus is permitted to transmit a D2D signal in
the configured resource.
CITATION LIST
Non Patent Literature
[0008] NPL 1: "D2D for LTE Proximity Services: Overview",
R1-132028, 3 GPP TSG-RAN WG1 Meeting #73, May 20 to 24, 2013
SUMMARY OF INVENTION
Technical Problem
[0009] However, in a case where the D2D is performed within LTE
coverage, interference occurs between cellular communication in the
related art and the D2D. A case has not been sufficiently studied
where the terminal apparatus performs the D2D and the cellular
communication simultaneously. An aspect of the present invention is
made in view of the above-described problem, and aims to provide a
terminal apparatus which can efficiently perform the D2D and a base
station apparatus which controls the terminal apparatus.
Solution to Problem
[0010] (1) According to a first aspect of the present invention, a
terminal apparatus that communicates with an Evolved Universal
Terrestrial Radio Network (EUTRAN) includes a reception unit which
receives first information indicating a length of a cyclic prefix
for an inter-terminal apparatus signal transmitted to the other
terminal apparatus and second information indicating a length of a
cyclic prefix for an uplink signal in the EUTRAN, from a base
station apparatus of the EUTRAN.
[0011] (2) In the first aspect of the present invention, the
inter-terminal apparatus signal may include a signal related to
discovery between terminal apparatuses and a signal related to
communication between the terminal apparatuses, and the first
information may individually indicate the length of the cyclic
prefix for the signal related to the discovery between the terminal
apparatuses and the length of the cyclic prefix for the signal
related to the communication between the terminal apparatuses.
[0012] (3) In the first aspect of the present invention, the
reception unit may receive, from the base station apparatus of the
EUTRAN, the first information for each of multiple sets of
resources for the inter-terminal apparatus signal.
[0013] (4) In the first aspect of the present invention, the
terminal apparatus may further include a transmission unit which
notifies the other terminal apparatus of the length of the cyclic
prefix for the inter-terminal apparatus signal.
[0014] (5) In the first aspect of the present invention, the
resources for the inter-terminal apparatus signal may be resources
of an uplink component carrier of a cell in a frequency division
duplex system in the EUTRAN, or resources of uplink subframes in a
time division duplex system in the EUTRAN.
[0015] (6) In the first aspect of the present invention, the
reception unit may detect the length of the cyclic prefix of a
downlink signal, based on the downlink signal in the EUTRAN.
[0016] (7) According to a second aspect of the present invention, a
base station apparatus on an Evolved Universal Terrestrial Radio
Network (EUTRAN) which communicates with a terminal apparatus
includes a transmission unit which transmits first information
indicating a length of a cyclic prefix for an inter-terminal
apparatus signal transmitted to the other terminal apparatus and
second information indicating a length of a cyclic prefix for an
uplink signal in the EUTRAN, to the terminal apparatus.
[0017] (8) In the second aspect of the present invention, the
inter-terminal apparatus signal may include a signal related to
discovery between terminal apparatuses and a signal related to
communication between the terminal apparatuses, and the first
information may individually indicate the length of the cyclic
prefix for the signal related to the discovery between the terminal
apparatuses and the length of the cyclic prefix for the signal
related to the communication between the terminal apparatuses.
[0018] (9) In the second aspect of the present invention, the
transmission unit may transmit the first information on each of
multiple sets of resources for the inter-terminal apparatus signal
to the terminal apparatus.
[0019] (10) In the second aspect of the present invention, the
terminal apparatus may notify the other terminal apparatus of the
length of the cyclic prefix for the inter-terminal apparatus
signal.
[0020] (11) In the second aspect of the present invention, the
resources for the inter-terminal apparatus signal may be resources
of an uplink component carrier of a cell in a frequency division
duplex system in the EUTRAN, or resources of uplink subframes in a
time division duplex system in the EUTRAN.
Advantageous Effects of Invention
[0021] According to an aspect of the invention, a terminal
apparatus can efficiently perform D2D, and a base station apparatus
can control the terminal apparatus.
BRIEF DESCRIPTION OF DRAWINGS
[0022] FIG. 1 is a conceptual diagram of a radio communication
system according to the present embodiment.
[0023] FIG. 2 is a diagram illustrating a schematic configuration
of a radio frame according to the present embodiment.
[0024] FIG. 3 is a diagram illustrating a configuration of a slot
according to the present embodiment.
[0025] FIG. 4 is a diagram illustrating D2D resources according to
the present embodiment.
[0026] FIG. 5 is a diagram illustrating transmission timing of a
terminal apparatus 1 according to the present embodiment.
[0027] FIG. 6 is a diagram illustrating information related to D2D
transmitted in a cellular link according to the present
embodiment.
[0028] FIG. 7 is a schematic block diagram illustrating a
configuration of the terminal apparatus 1 according to the present
embodiment.
[0029] FIG. 8 is a schematic block diagram illustrating a
configuration of a base station apparatus 3 according to the
present embodiment.
DESCRIPTION OF EMBODIMENTS
[0030] Hereinafter, an embodiment according to the present
invention will be described.
[0031] In the present embodiment, a terminal apparatus is
configured with one or multiple cells. A technology which allows
the terminal apparatus to communicate via the multiple cells is
called cell aggregation or carrier aggregation. The present
invention may be applied to each of the multiple cells configured
for the terminal apparatus. In addition, the present invention may
be applied to a part of the multiple configured cells. The cell
configured for the terminal apparatus is called a serving cell.
[0032] Multiple configured serving cells include one primary cell
and one or multiple secondary cells. The primary cell is a serving
cell in which an initial connection establishment procedure is
performed, a serving cell in which a connection re-establishment
procedure is initiated, or a cell which is indicated as the primary
cell in a handover procedure. The secondary cell may be configured
when or after Radio Resource Control (RRC) connection is
established.
[0033] In the case of the cell aggregation, a Time Division Duplex
(TDD) system or a Frequency Division Duplex (FDD) system may be
applied to all of the multiple cells. A cell to which the TDD
system is applied and a cell to which the FDD system is applied may
be aggregated.
[0034] FIG. 1 is a conceptual diagram of a radio communication
system according to the present embodiment. In FIG. 1, the radio
communication system includes terminal apparatuses 1A to 1C, a
repeater 2, and a base station apparatus 3. The terminal
apparatuses 1A to 1C are collectively referred to as a terminal
apparatus 1. The repeater 2 has a function of amplifying a signal
received from the terminal apparatus 1 and transmitting the
amplified signal. A serving cell 4 is an area covered by the base
station apparatus 3 (LTE).
[0035] An uplink 5 is a link from the terminal apparatus 1 to the
base station apparatus 3. In the uplink 5, a signal may be
transmitted from the terminal apparatus 1 to the base station
apparatus 3 without involving the repeater. A downlink 7 is a link
from the base station apparatus 3 to the terminal apparatus 1. In
addition, the uplink 5 and the downlink 7 are called a cellular
link or cellular communication path. In addition, communication
between the terminal apparatus 1 and the base station apparatus 3
is called cellular communication.
[0036] A D2D link 9 is a link between the terminal apparatuses 1.
The D2D link 9 is called a D2D communication path, a ProSe link, or
a ProSe communication path. In the D2D link 9, D2D discovery and
D2D communication are performed. The D2D discovery is a
process/procedure which specifies that the terminal apparatus 1 is
in proximity to the other terminal apparatus 1 by using the EUTRA.
The D2D communication is communication between two terminal
apparatuses 1 in proximity to each other, which uses a EUTRAN
communication path established between the two terminal apparatuses
1. For example, the communication path may be directly established
between the terminal apparatuses 1.
[0037] The D2D link 9 may include a ProSe-assisted Wireless Local
Area Network (WLAN) direct communication path. For example, the two
terminal apparatuses 1 in proximity to each other may be discovered
based on the D2D discovery, and the EUTRAN provides the two
terminal apparatuses 1 with configuration information of the WLAN.
The two terminal apparatuses 1 may establish the ProSe-assisted
Wireless Local Area Network (WLAN) direct communication path based
on the configuration information of the WLAN. For example, the two
terminal apparatuses 1 in proximity to each other may be discovered
based on the D2D discovery using the EUTRAN, and the EUTRAN
communication path or the ProSe-assisted Wireless Local Area
Network (WLAN) direct communication path is established between the
two discovered terminal apparatuses 1.
[0038] A physical channel and a physical signal according to the
present embodiment will be described.
[0039] A downlink physical channel and a downlink physical signal
are collectively called a downlink signal. An uplink physical
channel and an uplink physical signal are collectively called an
uplink signal. The physical channel is used for transmitting
information output from a higher layer. The physical signal is not
used for transmitting the information output from the higher layer,
but is used by a physical layer.
[0040] In FIG. 1, the following uplink physical channels are used
for uplink radio communication. [0041] Physical Uplink Control
Channel (PUCCH) [0042] Physical Uplink Shared Channel (PUSCH)
[0043] Physical Random Access Channel (PRACH)
[0044] The PUCCH is a physical channel used for transmitting Uplink
Control Information (UCI). The Uplink Control Information includes
Channel State Information (CSI) of the downlink, a Scheduling
Request (SR) indicating a request for a PUSCH resource, and
acknowledgement (ACK)/negative-acknowledgement (NACK) for downlink
data (Transport block, Downlink-Shared Channel: DL-SCH). The
ACK/NACK is called HARQ-ACK or HARQ feedback.
[0045] The PUSCH is a physical channel used for transmitting uplink
data (Uplink-Shared Channel: UL-SCH) and/or the HARQ-ACK and/or
channel state information.
[0046] The PRACH is a physical channel used for transmitting a
random access preamble. The PRACH is used in an initial connection
establishment procedure, a handover procedure, or a connection
re-establishment procedure.
[0047] In FIG. 1, the following uplink physical signal is used in
uplink radio communication. [0048] Uplink Reference Signal
(ULRS)
[0049] In the present embodiment, the following two types of the
uplink reference signal are used. [0050] Demodulation Reference
Signal (DMRS) [0051] Sounding Reference Signal (SRS)
[0052] The DMRS relates to transmission of the PUSCH or the PUCCH.
The DMRS is subjected to time multiplexing with the PUSCH or the
PUCCH. The base station apparatus 3 uses the DMRS in order to
perform channel compensation of the PUSCH or the PUCCH.
Transmitting the PUSCH and the DMRS together is simply called
transmitting the PUSCH. Transmitting the PUCCH and the DMRS
together is simply called transmitting the PUCCH. The SRS does not
relate to the transmission of the PUSCH or the PUCCH. The base
station apparatus 3 uses the SRS in order to measure an uplink
channel state.
[0053] In FIG. 1, the following downlink physical channels are used
in the downlink radio communication. [0054] Physical Broadcast
Channel (PBCH) [0055] Physical Control Format Indicator Channel
(PCFICH) [0056] Physical Hybrid automatic repeat request Indicator
Channel (PHICH) [0057] Physical Downlink Control Channel (PDCCH)
[0058] Enhanced Physical Downlink Control Channel (EPDCCH) [0059]
Physical Downlink Shared Channel (PDSCH) [0060] Physical Multicast
Channel (PMCH)
[0061] The PBCH is used for broadcasting a Master Information Block
(MIB, Broadcast Channel: BCH) commonly used in the terminal
apparatus 1. The MIB is transmitted at an interval of 40 ms, and
the MIB is repeatedly transmitted at a cycle of 10 ms. For example,
the MIB includes information indicating an SFN (system frame
number). The SFN is a radio frame number. The MIB is system
information.
[0062] The PCFICH is used for transmitting information indicating a
region (OFDM symbol) to be used in transmitting the PDCCH.
[0063] The PHICH is used for transmitting a HARQ indicator (HARQ
feedback) indicating Acknowledgement (ACK) or Negative
Acknowledgement (NACK) for the uplink data (Uplink Shared Channel:
UL-SCH) received by the base station apparatus 3.
[0064] The PDCCH and the EPDCCH are used for transmitting Downlink
Control Information (DCI). The Downlink Control Information is
called a DCI format. The Downlink Control Information includes a
downlink grant and an uplink grant. The downlink grant is called
downlink assignment or downlink allocation.
[0065] The uplink grant is used for scheduling of a single PUSCH
within a single cell. The uplink grant is used for scheduling of a
single PUSCH within a certain subframe. The downlink grant is used
for scheduling of a single PDSCH within a single cell. The downlink
grant is used for scheduling of the PDSCH within the same subframe
as the subframe from which the downlink is transmitted.
[0066] A Cyclic Redundancy Check (CRC) parity bit is added to the
DCI format. The CRC parity bit is scrambled by a Cell-Radio Network
Temporary Identifier (C-RNTI) or a Semi Persistent Scheduling
Cell-Radio Network Temporary Identifier (SPS C-RNTI). The C-RNTI
and the SPS C-RNTI are identifiers for identifying the terminal
apparatus 1 within a cell. The C-RNTI is used for controlling a
resource of the PDSCH or a resource of the PUSCH in a single
subframe. The SPS C-RNTI is used for allocating the resource of the
PDSCH or the PUSCH cyclically.
[0067] The PDSCH is used for transmitting downlink data (Downlink
Shared Channel: DL-SCH).
[0068] The PMCH is used for transmitting multicast data (Multicast
Channel: MCH).
[0069] In FIG. 1, the following downlink physical signals are used
in the downlink radio communication. [0070] Synchronization Signal
(SS) [0071] Downlink Reference Signal (DL RS)
[0072] The synchronization signal is used by the terminal apparatus
1 for synchronizing a downlink frequency domain and a time domain.
In the FDD system, the synchronization signal is arranged in a
subframe 0 and a subframe 5 within a radio frame.
[0073] The downlink reference signal is used by the terminal
apparatus 1 for performing channel compensation of a downlink
physical channel. The downlink reference signal is used by the
terminal apparatus 1 for calculating downlink channel state
information. The downlink reference signal is used by the terminal
apparatus 1 for measuring geographic locations of the terminal
apparatus 1.
[0074] In the present embodiment, the following five types of the
downlink reference signal are used. [0075] Cell-specific Reference
Signal (CRS) [0076] URS (UE-specific Reference Signal) related to
PDSCH [0077] DMRS (Demodulation Reference Signal) related to EPDCCH
[0078] Non-Zero Power Channel State Information-Reference Signal
(NZP CSI-RS) [0079] Zero Power Channel State Information-Reference
Signal (ZP CSI-RS) [0080] Multimedia Broadcast and Multicast
Service over a Single Frequency Network Reference signal (MBSFN
RS)
[0081] The CRS is transmitted to all bands of a subframe. The CRS
is used for demodulating PBCH/PDCCH/PHICH/PCFICH/PDSCH. The CRS may
be used by the terminal apparatus 1 for calculating the downlink
channel state information. The PBCH/PDCCH/PHICH/PCFICH are each
transmitted by an antenna port used in transmitting the CRS.
[0082] The URS related to the PDSCH is transmitted through a
subframe and a band which are used in transmitting the PDSCH to
which the URS is related. The URS is used for demodulating the
PDSCH to which the URS is related. The PDSCH is transmitted by the
antenna port used in transmitting the CRS or an antenna port used
in transmitting the URS.
[0083] The DMRS related to the EPDCCH is transmitted through a
subframe and a band which are used in transmitting the EPDCCH to
which the DMRS is related. The DMRS is used for demodulating the
EPDCCH to which the DMRS is related. The EPDCCH is transmitted by
an antenna port used in transmitting the DMRS.
[0084] The NZP CSI-RS is transmitted through a configured subframe.
The base station apparatus 3 configures a resource to which the NZP
CSI-RS is transmitted. The NZP CSI-RS is used by the terminal
apparatus 1 for calculating the downlink channel state information.
The terminal apparatus 1 performs signal measurement (channel
measurement) using the NZP CSI-RS.
[0085] The base station apparatus 3 configures a resource of the ZP
CSI-RS. The base station apparatus 3 transmits the ZP CSI-RS with a
zero power. That is, the base station apparatus 3 does not transmit
the ZP CSI-RS. The base station apparatus 3 does not transmit the
PDSCH and the EPDCCH in the resource configured to include the ZP
CSI-RS. For example, the terminal apparatus 1 can measure
interference in a resource to which the NZP CSI-RS corresponds in a
certain cell.
[0086] The MBSFN RS is transmitted through all bands of a subframe
used in transmitting the PMCH. The MBSFN RS is used for
demodulating the PMCH. The PMCH is transmitted by an antenna port
used in transmitting the MBSFN RS.
[0087] In FIG. 1, in radio communication of D2D link 9 between the
terminal apparatuses 1, a downlink signal, an uplink signal, or a
signal newly defined for the D2D (physical channel and physical
signal) may be used. A signal (physical channel and physical
signal) transmitted and received in the D2D link 9 is called a
signal used for the D2D, a signal for the D2D, and a D2D
signal.
[0088] The BCH, MCH, UL-SCH, and DL-SCH are transport channels. A
channel used in a Medium Access Control (MAC) layer is called the
transport channel. A unit of data in the transport channel used in
the MAC layer is called a transport block (TB) or a MAC Protocol
Data Unit (PDU). A Hybrid Automatic Repeat Request (HARD) is
controlled for each transport block in the MAC layer. The transport
block is a unit of data delivered to a physical layer by the MAC
layer. In the physical layer, the transport block is mapped into a
code word, and encoding processing is performed for each code
word.
[0089] The structure of a radio frame according to the present
embodiment will be described.
[0090] In the LTE, two radio frame structures are supported. The
two radio frame structures are a frame structure type 1 and a frame
structure type 2. The frame structure type 1 can be applied to the
FDD. The frame structure type 2 can be applied to the TDD.
[0091] FIG. 2 is a diagram illustrating a schematic configuration
of the radio frame according to the present embodiment. In FIG. 2,
the horizontal axis is a time axis. In addition, the radio frames
of the type 1 and the type 2 respectively have lengths of 10 ms,
and are defined by 10 subframes. The subframes respectively have
lengths of 1 ms each, and are defined by two contiguous slots. The
slots respectively have lengths of 0.5 ms each. The-i.sup.th
subframe within the radio frame consists of the (2.times.i).sup.th
slot and the (2.times.i+1).sup.th slot.
[0092] The following three types of subframes are defined for the
frame structure type 2. [0093] Downlink Subframe [0094] Uplink
Subframe [0095] Special Subframe
[0096] The downlink subframe is a subframe reserved for the
downlink transmission. The uplink subframe is a subframe reserved
for the uplink transmission. The special subframe consists of three
fields. The three fields are a Downlink Pilot Time Slot (DwPTS), a
Guard Period (GP), and an Uplink Pilot Time Slot (UpPTS). The total
length of the DwPTS, the GP, and the UpPTS is 1 ms. The DwPTS is a
field reserved for the downlink transmission. The UpPTS is a field
reserved for the uplink transmission. The GP is a field in which
the downlink transmission and the uplink transmission are not
performed. The special subframe may consists only of the DwPTS and
the GP, or may consists only of the GP and the UpPTS.
[0097] The radio frame of the frame structure type 2 consists of at
least the downlink subframe, the uplink subframe, and the special
subframe.
[0098] The configuration of the slot according to the present
embodiment will be described.
[0099] FIG. 3 is a diagram illustrating the configuration of the
slot according to the present embodiment. In FIG. 3, a normal
Cyclic Prefix (CP) is applied to the OFDM symbol or the SC-FDMA
symbol. A physical signal or a physical channel transmitted in each
slot is expressed by a resource grid. In FIG. 3, the horizontal
axis is a time axis, and a vertical axis is a frequency axis. In
the downlink, the resource grid is defined by multiple subcarriers
and multiple OFDM symbols. In the uplink, the resource grid is
defined by multiple subcarriers and multiple SC-FDMA symbols. For
example, in the D2D link, the resource grid may be defined by the
multiple subcarriers and the multiple SC-FDMA symbols. The number
of subcarriers configuring one slot depends on the bandwidth of a
cell. The number of the OFDM symbols or the SC-FDMA symbols which
configure one slot is seven. Each element within the resource grid
is called a resource element. The resource element is identified
using the number of the subcarriers and the number of the OFDM
symbols or the SC-FDMA symbols.
[0100] The resource block is used for expressing mapping of a
certain physical channel (PDSCH or PUSCH) into the resource
element. In the resource block, a virtual resource block and a
physical resource block are defined. The certain physical channel
is first mapped into the virtual resource block. Thereafter, the
virtual resource block is mapped into the physical resource block.
One physical resource block is defined by seven contiguous OFDM
symbols in a time domain or the SC-FDMA symbols and twelve
contiguous subcarriers in a frequency domain. Consequently, one
physical resource block is configured to include the resource
elements (the number is 7.times.12). In addition, one physical
resource block corresponds to one slot in the time domain, and
corresponds to 180 kHz in the frequency domain. The physical
resource block is numbered from zero in the frequency domain.
[0101] An extended CP may be applied to the OFDM symbols or the
SC-FDMA symbols. In the case of the extended CP, the number of the
OFDM symbols or the SC-FDMA symbols configuring one slot is
seven.
[0102] Arrangement of the physical channel and the physical signal
according to the present embodiment will be described.
[0103] FIG. 4 is a diagram illustrating D2D resources according to
the present embodiment. In FIG. 4, the horizontal axis is a time
axis, and the vertical axis is a frequency axis. In FIG. 4, D
represents the downlink subframe, S represents the special
subframe, and U represents the uplink subframe. One FDD cell
corresponds to one downlink carrier, or one downlink carrier and
one uplink carrier. One TDD cell corresponds to one TDD carrier.
One D2D cell corresponds to one D2D carrier.
[0104] In the FDD cell, the downlink signal used for cellular
communication is arranged in the subframe of the downlink carrier,
the uplink signal used for the cellular communication is arranged
in the subframe of the uplink carrier, and the D2D signal used for
the D2D is arranged in the subframe of the uplink carrier. The
carrier corresponding to the cell in the downlink is called a
downlink component carrier. In addition, the carrier corresponding
to the cell in the uplink is called an uplink component
carrier.
[0105] In the TDD cell, the downlink signal used for the cellular
communication is arranged in the downlink subframe and the DwPTS,
the uplink signal used for the cellular communication is arranged
in the uplink subframe and the UpPTS, and the D2D signal used for
the D2D is arranged in the uplink subframe and the UpPTS.
[0106] The D2D cell is a dedicated cell for the D2D, and the D2D
signal used for the D2D is arranged in the D2D cell. That is, The
D2D carrier to which the D2D cell corresponds is a dedicated
carrier for the D2D. The D2D carrier is called a D2D dedicated
spectrum or Public Safety (PS) spectrum. The D2D resource in the
D2D cell is called the D2D resource of the D2D dedicated spectrum
or a PS resource. In the 3GPP, it has been studied when the D2D
dedicated spectrum is used for the PS. The PS resource may also be
used for another purpose except for as the PS. The D2D cell used
for the PS may not be a serving cell.
[0107] Without establishing a cellular link, the terminal apparatus
1 may establish the D2D link for the PS in the D2D dedicated
spectrum. In a case where the terminal apparatus 1 establishes the
D2D link for the PS in the D2D dedicated spectrum without
establishing the cellular link, the terminal apparatus 1 may
establish the cellular link in advance, may perform a configuration
related to the D2D for the PS, and may get authorization on the D2D
for the PS.
[0108] The base station apparatus 3 controls the D2D resources
reserved for the D2D. The base station apparatus 3 reserves a part
of the resources of the uplink carrier of the FDD cell as the D2D
resources. The base station apparatus 3 reserves a part of the
resources of the uplink subframe and the UpPTS of the TDD cell as
the D2D resources. The base station apparatus 3 reserves all or a
part of the resources of the D2D cell as the D2D resources.
[0109] The base station apparatus 3 transmits a higher layer signal
including information indicating the D2D resources reserved in each
cell to the terminal apparatus 1. The terminal apparatus 1 sets a
parameter D2D-ResourceConfig indicating the D2D resources reserved
in each cell, based on the higher layer signal received from the
base station apparatus 3. That is, the base station apparatus 3
sets the parameter D2D-ResourceConfig indicating the D2D resources
reserved in each cell to the terminal apparatus 1 via the higher
layer signal.
[0110] A part of the frequency band of the uplink carrier
corresponding to the FDD cell may be reserved as the D2D dedicated
spectrum. In addition, a part of the frequency band of the uplink
subframe corresponding to the TDD cell may be reserved as the D2D
dedicated spectrum.
[0111] The base station apparatus 3 may notify the terminal
apparatus 1 of whether or not each set of the D2D resources is the
PS resource. The terminal apparatus 1 does not simultaneously
perform transmission processing of the D2D and reception processing
of the D2D in one carrier.
[0112] It is preferable that the D2D discovery/communication in the
D2D resources used for another purpose except for the PS be
controlled or monitored by the base station apparatus 3.
[0113] A configuration method of CP length according to the present
embodiment will be described.
[0114] Preferably, the CP length is controlled so that delay time
of a delay wave falls within the CP length. The base station
apparatus 3 controls the CP length of the uplink and the downlink.
The base station apparatus 3 may individually control the CP length
of the uplink and the downlink for each serving cell.
[0115] Based on the PBCH for the serving cell, the terminal
apparatus 1 detects the CP length of the downlink signal for the
serving cell, excludes the PMCH and the MBSFN RS. The extended CP
is always applied to the PMCH and the MBSFN RS.
[0116] The base station apparatus 3 transmits the higher layer
signal including information indicating the CP length of the uplink
signal in the serving cell to the terminal apparatus 1. The
terminal apparatus 1 sets a parameter UL-CyclicPrefixLength
indicating the CP length of the uplink in the serving cell, based
on the higher layer signal received from the base station apparatus
3. That is, the base station apparatus 3 sets the parameter
UL-CyclicPrefixLength indicating the CP length of the uplink in the
serving cell to the terminal apparatus 1 via the higher layer
signal. For example, as illustrated in FIG. 1, in a case where the
repeater 2 is used in the uplink, the extended CP may be applied in
the uplink in view of a processing delay in the repeater 2.
[0117] A D2D communication path from a certain terminal apparatus 1
to another terminal apparatus 1 is the same as a D2D communication
path from another terminal apparatus 1 to the certain terminal
apparatus 1. Therefore, in the D2D, it is preferable that the CP
length used for transmission from a certain terminal apparatus 1 to
another terminal apparatus 1 be the same as the CP length used for
transmission from another terminal apparatus 1 to the certain
terminal apparatus 1.
[0118] Since the D2D is communication between the terminal
apparatuses 1 in proximity to each other, it is expected that the
delay time of the delay wave will be short. Therefore, the CP
length in the D2D link may be the normal CP. That is, the CP length
in the D2D link may be defined by specifications in advance and may
be fixed.
[0119] However, a synchronization method in the D2D has not been
sufficiently studied, thereby causing a possibility that the
synchronization between the terminal apparatuses 1 may be
inaccurate. Therefore, the CP length in the D2D link may be that of
the extended CP.
[0120] In addition, based on the synchronization method for the
D2D, a radio condition between the terminal apparatuses 1, a
geographical distance between the terminal apparatuses 1, and/or
the uplink signal transmission timing for cellular communication in
each terminal apparatus 1, the terminal apparatus 1 or the base
station apparatus 3 may control the CP length in the D2D link. That
is, the CP length for the D2D, the CP length for the downlink, and
the CP length for the uplink may be controlled individually. That
is, the CP length for each of the D2D signal and the Uplink signal
which are transmitted through the same carrier may be configured
individually.
[0121] For example, the base station apparatus 3 may transmit, to
the terminal apparatus 1, the higher layer signal including the
information indicating the CP length for the D2D. The terminal
apparatus 1 may set a parameter D2D-CyclicPrefixLength indicating
the CP length for the D2D, based on the higher layer signal
received from the base station apparatus 3. That is, the base
station apparatus 3 may set the parameter D2D-CyclicPrefixLength
indicating the CP length for the D2D to the terminal apparatus 1
via the higher layer signal.
[0122] Based on the D2D signal and/or information received from the
other terminal apparatus 1, the terminal apparatus 1 may determine
the CP length for the D2D. The terminal apparatus 1 may transmit
the information indicating the CP length for the D2D to the other
terminal apparatus 1. The other terminal apparatus 1 may determine
the CP length for the D2D, based on the information indicating the
CP length for the D2D and received from the terminal apparatus
1.
[0123] The CP length of the D2D signal for the D2D discovery may be
different from the CP length for the D2D communication. The base
station apparatus 3 may transmit the higher layer signal including
information indicating the CP length for the D2D discovery to the
terminal apparatus 1. The base station apparatus 3 may transmit the
higher layer signal including information indicating the CP length
for the D2D communication to the terminal apparatus 1.
[0124] The CP length for the D2D discovery and/or the D2D
communication may be zero.
[0125] Transmission timing for the uplink according to the present
embodiment will be described.
[0126] A Timing Advance Group (TAG) is a group of serving cells
configured by an RRC layer. The same timing reference cell and the
same Timing Advance (TA) value are used for the serving cells
included in the same TAG and with the configured uplink.
[0127] A Primary Timing Advance Group (PTAG) is the TAG including a
primary cell. A timing reference cell for the PTAG is the primary
cell.
[0128] A secondary Timing Advance Group (STAG) is the TAG which
does not include the primary cell. The STAG includes at least one
serving cell with the configured uplink. The timing reference cell
for the STAG is any one secondary cell included in the STAG.
[0129] The D2D cell may not belong to any TAG.
[0130] The base station apparatus 3 transmits a Timing Advance (TA)
command for PTAG and a TA command for the STAG to the terminal
apparatus 1. The TA command is transmitted together with a TAG
identity (ID) specifying the TAG to which the TA command
corresponds. The TAG ID for the PTAG is zero. The TAG ID for the
STAG is configured by the base station apparatus 3 and is any
number from one to three.
[0131] In a case where the TA command for the PTAG is received, the
terminal apparatus 1 adjusts uplink transmission timing for the
PUSCH/PUCCH/SRS of the primary cell, based on the received TA
command. In a case where the secondary cell belongs to the PTAG,
the uplink transmission timing for the PUSCH/PUCCH/SRS of the
secondary cell is the same as the uplink transmission timing for
the primary cell.
[0132] In a case where the TA command for the STAG is received, the
terminal apparatus 1 adjusts the uplink transmission timing for the
PUSCH/PUCCH/SRS of all the secondary cells within the STAG, based
on the received TA command. The uplink transmission timing for the
PUSCH/PUCCH/SRS is the same for all of the secondary cells within
the STAG.
[0133] The terminal apparatus 1 measures reference timing based on
the downlink signal (for example, synchronization signal) of the
timing reference cell. The terminal apparatus 1 determines a value
of the TA for the Uplink transmission, based on the TA command. The
terminal apparatus 1 determines the uplink transmission timing,
based on the measured reference timing and the value of the TA.
[0134] Transmission timing for the D2D according to the present
embodiment will be described.
[0135] FIG. 5 is a diagram illustrating the transmission timing of
the terminal apparatus 1 according to the present embodiment. In
FIG. 5, the horizontal axis is a time axis. In FIG. 5, downlink
transmission timing is transmission timing of the downlink signal
transmitted by the base station apparatus 3, downlink reception
timing is reception timing of the downlink signal received by the
terminal apparatus 1, and uplink transmission timing is
transmission timing of the uplink signal transmitted by the
terminal apparatus 1. The uplink reception timing is reception
timing of the uplink signal received by the base station apparatus
3. The D2D transmission timing is transmission timing of the D2D
signal transmitted by the terminal apparatus 1. It is preferable
that the base station apparatus 3 control the value of the TA for
the uplink transmission so that the downlink transmission timing
and the uplink transmission timing coincide with each other.
[0136] In a case where the resource for the uplink transmission and
the D2D resource are subjected to time multiplexing and the uplink
transmission timing and the D2D transmission timing are different
from each other, the D2D signal in a certain subframe interferes
with the uplink signal in the adjacent subframe, on the base
station apparatus 3 side. Consequently, it is preferable that the
D2D transmission timing be the same as the uplink transmission
timing on the terminal apparatus 1 side. In this manner, the D2D
signal transmitted through a subframe #4 in FIG. 5 interferes with
only the subframe #4 on the base station apparatus 3 side, and thus
does not interfere with the adjacent subframes #3 and #5.
[0137] The D2D transmission timing of the terminal apparatus 1 in
the D2D dedicated spectrum may be different from the uplink
transmission timing. For example, the D2D transmission timing in
the D2D dedicated spectrum may be determined, based on a Global
Navigation Satellite System (GNSS) and/or the D2D signal received
from another terminal apparatus 1.
[0138] In a case where the transmission of the uplink signal and
the transmission of the D2D signal occur in the same subframe
(timing, symbol) of the same cell, the uplink transmission timing
and the D2D transmission timing are the same as each other, and the
CP length of the uplink signal and the CP length of the D2D signal
are the same as each other, the terminal apparatus 1 may
simultaneously transmit the uplink signal and the D2D signal on the
same subframe (timing) of the same cell.
[0139] In a case where the transmission of the uplink signal and
the transmission of the D2D signal occur in the same subframe
(timing, symbol) of the same cell, and the uplink transmission
timing and the D2D transmission timing are different from each
other, the terminal apparatus 1 may drop either the transmission of
the uplink signal or the transmission of the D2D signal.
[0140] In a case where the transmission of the uplink signal and
the transmission of the D2D signal occur in the same subframe
(timing, symbol) of the same cell, and the CP length of the uplink
signal and the CP length of the D2D signal are different from each
other, the terminal apparatus 1 may drop either the transmission of
the uplink signal or the transmission of the D2D signal.
[0141] In a case where the transmission of the uplink signal and
the transmission of the D2D signal occur in the same subframe
(timing, symbol) of the same cell, the terminal apparatus 1 may
drop either the transmission of the uplink signal or the
transmission of the D2D signal.
[0142] In a case where the transmission of the uplink signal and
the transmission of the D2D signal occur in the same subframe
(timing, symbol) of the same cell, the terminal apparatus 1 may
simultaneously transmit the uplink signal and the D2D signal
through the same subframe (timing) of the same cell.
[0143] In a case where the transmission of the uplink signal and
the transmission of the D2D signal occur in the same subframe
(timing, symbol) of the different cell, the terminal apparatus 1
may simultaneously transmit the uplink signal and the D2D signal
through the same subframe (timing) of the different cell.
[0144] In a case where the transmission of the uplink signal and
the transmission of the D2D signal occur in the same subframe
(timing, symbol) of the different cell, the terminal apparatus 1
may drop either the transmission of the uplink signal or the
transmission of the D2D signal.
[0145] A TA timer according to the present embodiment will be
described.
[0146] The terminal apparatus 1 manages the TA timer for each TAG.
When receiving the TA command, the terminal apparatus 1 starts or
restarts the TA timer related to the TAG to which the TA command is
applied.
[0147] In a case where the TA timer related to the PTAG expires,
for the uplink, the terminal apparatus 1 performs the following
processing (from A1 to A3). [0148] Processing (A1): For all of the
serving cells, a HARQ buffer related to transmission processing of
the uplink is flushed. [0149] Processing (A2): For all of the
serving cells, the PUCCH/SRS related to the uplink is released.
[0150] Processing (A3): it is considered that all of the running TA
timers expire.
[0151] In a case where the TA timer related to the STAG expires,
the terminal apparatus 1 performs the following processing (B1 and
B2) for the uplink. [0152] Processing (B1): For all the serving
cells belonging to the STAG, all the HARQ buffers related to the
transmission processing of the uplink are flushed. [0153]
Processing (B2): For all of the serving cells belonging to the
STAG, the PUCCH/SRS related to the uplink is released.
[0154] In a case where the TA timer related to the TAG to which the
serving cell belongs is not running, the terminal apparatus 1 does
not perform the uplink transmission through the serving cell except
for random access preamble transmission. In a case where the TA
timer related to the PTAG is not running, the terminal apparatus 1
does not perform the uplink transmission through all the serving
cells except for the random access preamble transmission through
the primary cell.
[0155] Furthermore, in a case where the TA timer related to the
PTAG expires, the terminal apparatus 1 performs part of or all of
the following processing (C1 to C8) for all of the cells configured
with D2D resource, except for the cells in the D2D dedicated
spectrum. In addition, in a case where the TA timer related to the
STAG expires, the terminal apparatus 1 performs part or all of the
following processing (C1 to C8) for all of the cells belonging the
STAG, except for the cells in the D2D dedicated spectrum. [0156]
Processing (C1): The procedure for the D2D discovery is stopped.
[0157] Processing (C2): The D2D communication is stopped. [0158]
Processing (C3): ProSe-assisted WLAN direct communication is
stopped/disconnected. [0159] Processing (C4): The D2D resource is
released. [0160] Processing (C5): All of the HARQ buffers related
to transmission processing of the D2D are flushed. [0161]
Processing (C6): All soft buffers related to reception processing
of the D2D are flushed. [0162] Processing (C7): The D2D is
deactivated. [0163] Processing (C8): All configurations for the D2D
are discarded.
[0164] In the processing (C3), WLAN communication except for the
ProSe-assisted WLAN direct communication may not be
stopped/disconnected.
[0165] In the processing (C8), the MAC layer may instruct the RRC
layer so as to discard all of the configurations for the D2D in the
RRC layer.
[0166] In a case where the TA timer related to the TAG to which the
serving cell belongs is not running, the terminal apparatus 1 does
not perform the D2D transmission through the serving cell except
for the D2D transmission through the D2D dedicated spectrum. In a
case where the TA timer related to the PTAG is not running, the
terminal apparatus 1 does not perform the D2D transmission through
all of the serving cells except for the D2D transmission through
the D2D dedicated spectrum.
[0167] In a case where the D2D is performed between the terminal
apparatuses 1 which have different values of the TA in the uplink
transmission, due to the fact that the D2D transmission timing and
the uplink transmission timing have to be the same, the D2D
transmission timing in one terminal apparatus 1 and the D2D
transmission timing in another terminal apparatus 1 become
different from each other.
[0168] Therefore, the terminal apparatus 1 may transmit information
indicating a timing reference cell in the terminal apparatus 1 and
information indicating the D2D transmission timing (value of the TA
which is obtained from the reference timing measured, based on the
downlink signal of the timing reference cell) in the terminal
apparatus 1, to the other terminal apparatus 1.
[0169] In addition, the D2D transmission timing may be controlled
between the terminal apparatuses 1. The terminal apparatus 1 may
determine the value of the TA for the D2D, based on the D2D signal
received from the other terminal apparatus 1 and transmit the TA
command indicating the value of the TA to the other terminal
apparatus 1.
[0170] In this case, the TA timer for the D2D may be defined. In a
case where the terminal apparatus 1 receives the TA command for the
D2D, the terminal apparatus 1 may start or restart the TA timer. In
a case where the TA timer for the D2D expires, the terminal
apparatus 1 may perform part or all of the processing (C1 to C8)
for the D2D resource to which the TA timer corresponds.
[0171] Activation and deactivation of the D2D according to the
present embodiment will be described.
[0172] A function of the D2D is activated or deactivated by the
terminal apparatus 1. It is preferable that the activation and
deactivation of the D2D be controlled by the MAC layer. For
example, in the terminal apparatus 1, the D2D may be activated or
deactivated by a user or by an input from an application.
[0173] For example, the terminal apparatus 1 may activate or
deactivate the D2D based on the D2D command (information) received
from the base station apparatus 3. The D2D command is used for
activating and deactivating the D2D. The D2D command may include an
MAC Control Element (CE) or an RRC message. In addition, the D2D
command may include an activation/deactivation MAC CE. The
activation/deactivation MAC CE is used by the base station
apparatus 3 for activating and deactivating the secondary cell.
[0174] For example, in a case where a D2D deactivation timer
expires, the D2D may be deactivated by the terminal apparatus 1. In
a case where the D2D is activated based on the input from the user
or the application, the terminal apparatus 1 may start or restart a
D2D deactivation timer. In a case where the D2D is activated based
on the received D2D command, the terminal apparatus 1 may start or
restart the D2D deactivation timer.
[0175] The base station apparatus 3 may set the duration of the D2D
deactivation timer in the terminal apparatus 1 via the higher layer
signal. The duration of the D2D deactivation timer may vary for
each cell. In addition, the duration of the D2D deactivation timer
may vary for each set of the D2D resource. In addition, the
duration of the D2D deactivation timer may vary for each D2D
communication path.
[0176] The D2D deactivation timer may not be defined for the D2D
dedicated spectrum. In addition, the duration of the D2D
deactivation timer for the D2D dedicated spectrum may be fixed (for
example, infinitely). That is, the base station apparatus 3 may
transmit the higher layer signal including information indicating
the duration of the D2D deactivation timer for the cell or the set
of the D2D resource except for the D2D dedicated spectrum, to the
terminal apparatus 1.
[0177] In a case where the function of the D2D is activated, the
terminal apparatus 1 may transmit information indicating that the
function of the D2D is activated to the base station apparatus 3.
The information indicating that the function of the D2D is
activated may be included in the MAC CE or the RRC message.
[0178] In a case where the function of the D2D is activated based
on the D2D command, the terminal apparatus 1 may not report the
information indicating that the function of the D2D is activated,
to the base station apparatus 3. The terminal apparatus 1 may
transmit/report the ACK (HARQ-ACK) for a transport block including
the D2D command to the base station apparatus 3 through the PUSCH
or the PUCCH.
[0179] In a case where the function of the D2D is deactivated, the
terminal apparatus 1 may transmit information indicating that the
function of the D2D is deactivated, to the base station apparatus
3. The information indicating that the function of the D2D is
deactivated may be included in the MAC CE or the RRC message.
[0180] In a case where the function of the D2D is deactivated based
on the D2D command, the terminal apparatus 1 may not report the
information indicating that the function of the D2D is deactivated,
to the base station apparatus 3. The terminal apparatus 1 may
transmit/report the ACK (HARQ-ACK) for the transport block
including the D2D command, to the base station apparatus 3 through
the PUSCH or the PUCCH. In a case where the function of the D2D is
deactivated, the terminal apparatus 1 may perform part or all of
the processing (C1 to C6).
[0181] In a case where the function of the D2D is deactivated, the
terminal apparatus 1 may transmit the information indicating that
the function of the D2D is deactivated, to the other terminal
apparatus 1 which performs the D2D communication. A function of the
D2D discovery and a function of the D2D communication may be
individually activated or deactivated.
[0182] In a case where the function of the D2D is activated, the
terminal apparatus 1 [0183] (D1): may perform and start the D2D
discovery, in the D2D link; [0184] (D2): may perform and start the
D2D communication, in the D2D link; [0185] (D3): may perform and
start the ProSe-assisted WLAN direct communication, in the D2D
link; [0186] (D4): may perform reception processing and monitoring
of the downlink signal related to the D2D link, in the downlink;
[0187] (D5): may perform transmission processing on the uplink
signal related to the D2D link, in the uplink.
[0188] In a case where the function of the D2D is deactivated, the
terminal apparatus 1 [0189] (E1): does not perform and start the
D2D discovery, in the D2D link; [0190] (E2): does not perform and
start the D2D communication, in the D2D link; [0191] (E3): does not
perform and start the ProSe-assisted WLAN direct communication, in
the D2D link; [0192] (E4): does not perform the reception
processing and monitoring of the downlink signal related to the D2D
link, in the downlink; [0193] (E5): does not perform the
transmission processing on the uplink signal related to the D2D
link, in the uplink.
[0194] For example, the downlink signal related to the D2D link
includes information/DCI used for controlling transmission power
for transmission of the D2D signal, information/DCI instructing the
start of a procedure of D2D discovery, information/DCI indicating a
format of the D2D signal related to the D2D discovery,
information/DCI used for generating a sequence of the D2D signal
related to the D2D discovery, information/DCI indicating the D2D
resource for the D2D discovery or the D2D communication,
information related to the configuration of ProSe-assisted WLAN
direct communication, and information indicating the configuration
of the D2D link.
[0195] For example, the uplink signal related to the D2D link
includes information related to the D2D link. The information
related to the D2D link will be described in detail later.
[0196] This enables the EUTRAN and the user to activate and
deactivate the function of the D2D at any desired timing. The
function of the D2D may be activated and deactivated for each cell,
for each application, or for each D2D communication path. In
addition, one D2D deactivation timer may be defined for each cell,
for each application, or for each D2D communication path.
[0197] The information/DCI instructing the start of a procedure of
D2D discovery, the information/DCI used for generating a sequence
of the D2D signal related to the D2D discovery, the information/DCI
indicating the D2D resource for the D2D discovery may be
transmitted together via a single PDCCH or a single EPDCCH.
[0198] The terminal apparatus 1 receiving the three distinct
information/DCI items may perform the following processing (F1 to
F4). [0199] Processing (F1): The procedure of the D2D discovery is
started based on the information/DCI instructing to start the
procedure of the D2D discovery. [0200] Processing (F2): A sequence
of the D2D signal related to the D2D discovery is generated based
on the information/DCI used for generating a sequence of the D2D
signal related to D2D discovery. [0201] Processing (F3): The D2D
resource used for transmitting the D2D signal related to the D2D
discovery is selected based on the information/DCI indicating the
D2D resource for the D2D discovery. [0202] Processing (F4): the D2D
signal of a generated sequence is transmitted in the selected D2D
resource.
[0203] FIG. 6 is a diagram illustrating the information related to
the D2D which is transmitted in the cellular link according to the
present embodiment. In FIG. 6, a cellular communication path is
established between the base station apparatus 3 and the terminal
apparatus 1A. In FIG. 6, a D2D communication path is established
between the terminal apparatus 1A and the terminal apparatus
1B.
[0204] The base station apparatus 3 and the terminal apparatus 1A
perform transmission and reception processing of the information
related to the D2D so that the base station apparatus 3 controls
and/or monitors the D2D communication path and/or the
ProSe-assisted WLAN direct communication path.
[0205] The terminal apparatus 1A transmits the information related
to the D2D capability to the base station apparatus 3 (S600). Based
on the received information related to the D2D capability, the base
station apparatus 3 transmits information indicating a
configuration of the D2D link to the terminal apparatus 1A (S602).
Based on the received information indicating the configuration of
the D2D link, the terminal apparatus 1A establishes D2D connection
(S604). The terminal apparatus 1A transmits information related to
the established D2D link (connection) to the base station apparatus
3 (S606).
[0206] In S604, the terminal apparatus 1A may transmit/transfer the
information related to the configuration of the D2D link to the
terminal apparatus 1B.
[0207] In FIG. 6, the terminal apparatus 1B may establish a
cellular communication path connected to the other base station
apparatus 3. The terminal apparatus 1B may transmit the information
related to the D2D link to the other base station apparatus 3.
Multiple base station apparatuses 3 may transmit-receive/transfer
the information related to the D2D link via backhaul established
between the base station apparatuses 3.
[0208] In FIG. 6, the terminal apparatus 1B may establish a
cellular communication path connected to the base station apparatus
3. The terminal apparatus 1B may transmit the information related
to the D2D link to the base station apparatus 3.
[0209] In FIG. 6, only a part of the terminal apparatuses 1 (for
example, one terminal apparatus 1) within a group of the terminal
apparatuses 1 performing the D2D may transmit the information
related to the D2D link to the EUTRAN (base station apparatus 3).
The part of the terminal apparatuses 1 may be determined from
between the terminal apparatuses 1 performing the D2D. In addition,
the part of the terminal apparatuses 1 may be designated by the
base station apparatus 3. In addition, the base station apparatus 3
may configure whether to report the information related to the D2D
link via the higher layer signal for each of the terminal
apparatuses 1.
[0210] This can avoid a case where the same information related to
the D2D link is repeatedly transmitted to the EUTRAN using the
uplink resource. Accordingly, it is possible to improve a usage
efficiency of the uplink resource.
[0211] The information related to the D2D capability may include
part or all of distinct information items (G1 to G17). The distinct
information items (G1 to G17) may be respectively transmitted at
different timings. [0212] Information (G1): Information indicating
whether or not the terminal apparatus 1 supports a capability of
the ProSe-assisted WLAN direct communication [0213] Information
(G2): Information indicating a standard of the WLAN supported by
the terminal apparatus 1 (for example, Institute of Electrical and
Electronics Engineers (IEEE) 802.11a/b/g/n/ac, IEEE802.11 series)
[0214] Information (G3): Information indicates the standard of the
WLAN supported by the terminal apparatus 1 and which can be used
for the ProSe-assisted WLAN direct communication [0215] Information
(G4): Information indicating whether or not the terminal apparatus
1 supports a capability of the D2D discovery in the EUTRAN [0216]
Information (G5): Information indicating whether or not the
terminal apparatus 1 supports a capability of the D2D communication
in the EUTRAN [0217] Information (G6): Information indicating
whether or not the terminal apparatus 1 supports a capability of
simultaneously performing the D2D discovery/communication in the
EUTRAN and the ProSe-assisted WLAN direct communication [0218]
Information (G7): Information indicating whether or not the
terminal apparatus 1 supports a capability of simultaneously
performing the cellular communication and the ProSe-assisted WLAN
direct communication [0219] Information (G8): Information
indicating whether or not the terminal apparatus 1 supports a
capability of simultaneously performing the cellular communication
and the D2D discovery/communication in a single cell [0220]
Information (G9): Information indicating whether or not the
terminal apparatus 1 supports a capability of simultaneously
performing the transmission on the cellular communication and the
transmission on the D2D discovery/communication in a single cell
[0221] Information (G10): Information indicating whether or not the
terminal apparatus 1 supports a capability of simultaneously
performing the reception on the cellular communication and the
transmission on the D2D discovery/communication in a single FDD
cell [0222] Information (G11): Information indicating whether or
not the terminal apparatus 1 supports a capability of
simultaneously performing the reception on the cellular
communication and the reception on the D2D discovery/communication
in a single FDD cell [0223] Information (G12): Information
indicating whether or not the terminal apparatus 1 supports a
capability of simultaneously performing the cellular communication
in a certain cell and the D2D discovery/communication in another
cell [0224] Information (G13): Information indicating whether or
not the terminal apparatus 1 supports a capability of
simultaneously performing the transmission on the cellular
communication in a certain cell and the transmission on the D2D
discovery/communication in another cell [0225] Information (G14):
Information indicating whether or not the terminal apparatus 1
supports a capability of simultaneously performing the reception on
the cellular communication in a certain cell and the reception on
the D2D discovery/communication in another cell [0226] Information
(G15): Information indicating whether or not the terminal apparatus
1 supports a capability of simultaneously performing the
transmission on the cellular communication in a certain cell and
the reception on the D2D discovery/communication in another cell
[0227] Information (G16): Information indicating whether or not the
terminal apparatus 1 supports a capability of simultaneously
performing the reception on the cellular communication in a certain
cell and the transmission on the D2D discovery/communication in
another cell [0228] Information (G17): Information requesting to
schedule/allocate/configure of the D2D resources used by the
terminal apparatus 1 for the D2D communication and/or the D2D
discovery
[0229] The base station apparatus 3 may transmit information
indicating the configuration of the D2D link for each set of the
D2D resources, to the terminal apparatus 1. Multiple sets of the
D2D resources may be arranged for one terminal apparatus 1. One set
of the D2D resources may be included in one cell. Multiple sets of
the D2D resources may be arranged in one cell. One set of the D2D
resources may be arranged for each D2D communication path. Multiple
D2D communication paths may be established in one terminal
apparatus 1.
[0230] The information indicating the configuration of the D2D link
may include part or all of distinct information items (H1 to H15).
The distinct information items (H1 to H15) may be respectively
transmitted at different timings. [0231] Information (H1):
Information indicating a cell including the D2D resource [0232]
Information (H2): Information indicating a subframe including the
D2D resource [0233] Information (H3): Information indicating a
frequency bandwidth and/or a frequency position of the D2D resource
within a subframe [0234] Information (H4): Information indicating a
virtual resource block or a physical resource block which
configures the D2D resource within a subframe [0235] Information
(H5): Information indicating a cell including the PS resource
[0236] Information (H6): Information indicating a subframe
including the PS resource [0237] Information (H7): Information
indicating a frequency bandwidth and/or a frequency position of the
PS resource within a subframe [0238] Information (H8): Information
indicating a virtual resource block or a physical resource block
which configures the PS resource within a subframe [0239]
Information (H9): Information indicating validity/instruction of
resource hopping of the D2D signal (for example, the PUSCH) [0240]
Information (H10): Information indicating a resource hopping mode
of the D2D signal [0241] Information (H11): Information indicating
validity/instruction of hopping of the D2D resource [0242]
Information (H12): Information indicating a hopping mode of the D2D
resource [0243] Information (H13): Information indicating a
configuration of the D2D signal related to the D2D discovery [0244]
Information (H14): Information indicating a configuration of the
D2D signal related to the D2D communication [0245] Information
(H15): Information indicating a configuration of the ProSe-assisted
WLAN direct communication
[0246] The information (H2) may indicate a cycle and an offset with
respect to numbers of subframes for the reserved D2D resource. The
information (H2) may be expressed by a bitmap. Each bit of the
bitmap may correspond to one subframe.
[0247] The hopping mode of the D2D signal includes an
inter-subframe mode, and an intra and inter-subframe mode. In the
inter-subframe mode, the resources of the D2D signal are hopping in
each subframe. In the intra and inter-subframe mode, the resources
of the D2D signal are hopping in each slot.
[0248] The information related to the D2D link may include part or
all of distinct information items (I1 to I42). The distinct
information items (I1 to I42) may be respectively transmitted at
different timings. [0249] Information (I1): Information indicating
a subset of the D2D resources used for the D2D discovery and/or the
D2D communication [0250] Information (I2): Information indicating a
subset of the D2D resources in which the transmission processing of
the D2D signal is performed [0251] Information (I3): Information
indicating a subset of the D2D resources in which the reception
processing/monitoring of the D2D signal is performed [0252]
Information (I4): Information indicating a band(s) used for the D2D
discovery and/or the D2D communication [0253] Information (I5):
Information indicating a band(s) in which the transmission
processing of the D2D signal is performed [0254] Information (I6):
Information indicating a band(s) in which the reception
processing/monitoring of the D2D signal is performed [0255]
Information (I7): Information indicating a cell(s) used for the D2D
discovery and/or the D2D communication [0256] Information (I8):
Information indicating a cell(s) in which the transmission
processing of the D2D signal is performed [0257] Information (I9):
Information indicating a cell(s) in which the reception
processing/monitoring of the D2D signal is performed [0258]
Information (I10): Information indicating a subframe(s) used for
the D2D discovery and/or the D2D communication [0259] Information
(I11): Information indicating a subframe(s) in which the
transmission processing of the D2D signal is performed [0260]
Information (I12): Information indicating a subframe(s) in which
the reception processing/monitoring of the D2D signal is performed
[0261] Information (I13): Information indicating the CP length of
the D2D signal [0262] Information (I14): Information indicating
whether or not the D2D is performed in the D2D dedicated spectrum
[0263] Information (I15): Information indicating that the D2D is
started in the D2D dedicated spectrum [0264] Information (I16):
Information indicating that the D2D is completed in the D2D
dedicated spectrum [0265] Information (I17): Information indicating
whether or not the D2D for the PS is performed [0266] Information
(I18): Information indicating that the D2D for the PS is started
[0267] Information (I19): Information indicating that the D2D for
the PS is terminated [0268] Information (I20): Information
indicating whether or not the WLAN communication is performed
[0269] Information (I21): Information indicating that the WLAN
communication is started [0270] Information (I22): Information
indicating that the WLAN communication is terminated [0271]
Information (I23): Information indicating the standard of the WLAN
used in the WLAN communication [0272] Information (I24):
Information indicating whether or not the ProSe-assisted WLAN
direct communication is performed [0273] Information (I25):
Information indicating that the ProSe-assisted WLAN direct
communication is started [0274] Information (I26): Information
indicating that the ProSe-assisted WLAN direct communication is
terminated [0275] Information (I27): Information indicating the
standard of the WLAN used in the ProSe-assisted WLAN direct
communication [0276] Information (I28): Information indicating a
channel state (measured interference) in the D2D communication path
and/or the ProSe-assisted WLAN direct communication path [0277]
Information (I29): Information indicating Quality of Service (QoS)
in the D2D communication path and/or the ProSe-assisted WLAN direct
communication path [0278] Information (I30): Information indicating
a traffic amount transmitted and received in the D2D communication
path and/or the ProSe-assisted WLAN direct communication path
[0279] Information (I31): Information indicating a traffic amount
transmitted in the D2D communication path and/or the ProSe-assisted
WLAN direct communication path [0280] Information (I32):
Information indicating a traffic amount received in the D2D
communication path and/or the ProSe-assisted WLAN direct
communication path [0281] Information (I33): Information indicating
an amount of traffic (data and packet) in a transmission waiting
state in the D2D communication path and/or the ProSe-assisted WLAN
direct communication path (Buffer Status Report: BSR) [0282]
Information (I34): Information indicating a communication range in
the D2D communication path and/or the ProSe-assisted WLAN direct
communication path [0283] Information (I35): Information indicating
priority of a packet in the D2D communication path and/or the
ProSe-assisted WLAN direct communication path [0284] Information
(I36): Information indicating an average bit rate in the D2D
communication path and/or the ProSe-assisted WLAN direct
communication path [0285] Information (I37): Information indicating
average packet delay in the D2D communication path and/or the
ProSe-assisted WLAN direct communication path [0286] Information
(I38): Information indicating an average packet loss rate (Block
Error Rate: BLER) in the D2D communication path and/or the
ProSe-assisted WLAN direct communication path [0287] Information
(I39): Information indicating whether or not the QoS in the D2D
communication path and/or the ProSe-assisted WLAN direct
communication path satisfies the QoS to which a QoS Class
Identifier (QCI) for the D2D communication path and/or the
ProSe-assisted WLAN direct communication channel corresponds [0288]
Information (I40): Information indicating an identifier (identity)
of the terminal apparatus 1 performing the D2D communication and/or
the ProSe-assisted WLAN direct communication [0289] Information
(I41): Information indicating a Public Land Mobile Network
(PLMN)/operator to which the terminal apparatus 1 performing the
D2D communication and/or the ProSe-assisted WLAN direct
communication is connected [0290] Information (I42): Information
indicating a geographic location of the terminal apparatus 1
[0291] The terminal apparatus 1 may transmit the information
related to the D2D link for each set of the D2D resources, for each
D2D communication path, for each ProSe-assisted WLAN direct
communication path, and/or for each application, to the base
station apparatus 3.
[0292] The report on the information related to the D2D link may be
triggered in a case where any state of the distinct information
items (I1 to I42) is changed. In addition, the report on the
information related to the D2D link may be triggered in a case
where any value of the distinct information items (I1 to I42) is
changed to reach a threshold value or greater. In addition, the
report on the information related to the D2D link may be triggered
in a case where any value of the distinct information items (I1 to
I42) when the information related to the D2D link is finally
reported is different from a current value by the threshold value
or greater. In this case, among the distinct information items (I1
to I42), only the distinct information item corresponding to the
trigger may be reported. The report on the information related to
the D2D link may be triggered based on the instruction from the
base station apparatus 3.
[0293] For example, in a case where the traffic amount transmitted
in the D2D transmission path goes beyond the threshold value, the
report on the information related to the D2D link may be triggered.
For example, the report on the information related to the D2D link
may be triggered in a case where the QoS in the D2D communication
path and/or the ProSe-assisted WLAN direct communication path does
not satisfy the QoS to which the QoS Class Identifier (QCI) for the
D2D communication path and/or the ProSe-assisted WLAN direct
communication path corresponds.
[0294] The terminal apparatus 1 may report the information related
to the D2D link by using the PUSCH in a case where at least one
report on the information related to the D2D link is triggered, the
PUSCH for initial transmission in the uplink is allocated, and the
information related to the D2D link can be accommodated in the
PUSCH as a result of a logical channel prioritization
procedure.
[0295] The QCI is defined by priority of the packet, a packet delay
budget, a packet error loss rate, presence or absence of a
guaranteed bit rate. The QCI is a scalar used for comparing
specific packet transmission operations. The base station apparatus
3 may transmit information indicating the QCI corresponding to the
D2D communication path to the terminal apparatus 1.
[0296] The geographic location of the terminal apparatus 1 may be
measured based on a PRS and/or the Global Navigation Satellite
System (GNSS).
[0297] For example, the terminal apparatus 1 may determine the
subset of the D2D resources used for transmission and reception of
the D2D signal from among the D2D resources indicated by the
information indicating the configuration of the D2D link, and may
transmit the distinct information (I1) indicating the determined
subset of the D2D resources to the base station apparatus 3.
[0298] Hereinafter, a configuration of the apparatuses according to
the present invention will be described.
[0299] FIG. 7 is a schematic block diagram illustrating the
configuration of the terminal apparatus 1 according to the present
embodiment. As illustrated, the terminal apparatus 1 is configured
to include a higher layer processing unit 101, a control unit 103,
a reception unit 105, a transmission unit 107, and a
transmit-receive antenna unit 109. In addition, the higher layer
processing unit 101 is configured to include a radio resource
control unit 1011, a scheduling information interpretation unit
1013, and a D2D control unit 1015. In addition, the reception unit
105 is configured to include a decoding unit 1051, a demodulation
unit 1053, a demultiplexing unit 1055, a radio reception unit 1057,
and a channel measurement unit 1059. In addition, the transmission
unit 107 is configured to include an encoding unit 1071, a
modulation unit 1073, a multiplexing unit 1075, a radio
transmission unit 1077, and an uplink reference signal generation
unit 1079.
[0300] The higher layer processing unit 101 outputs uplink data
(transport block) generated by an operation of a user to the
transmission unit 107. In addition, the higher layer processing
unit 101 performs processing for a Medium Access Control (MAC)
layer, a Packet Data Convergence Protocol (PDCP) layer, a radio
Link Control (RLC) layer, and a Radio Resource Control (RRC)
layer.
[0301] The radio resource control unit 1011 included in the higher
layer processing unit 101 manages various configuration information
items/parameters of the terminal apparatus 1. The radio resource
control unit 1011 sets the various configuration information
items/parameters, based on the higher layer signal received from
the base station apparatus 3. That is, the radio resource control
unit 1011 sets the various configuration information
items/parameters, based on the information indicating the various
configuration information items/parameters received from the base
station apparatus 3. In addition, the radio resource control unit
1011 generates information which is to be arranged in each uplink
channel, and outputs the information to the transmission unit
107.
[0302] The scheduling information interpretation unit 1013 included
in the higher layer processing unit 101 interprets a DCI format
(scheduling information) received via the reception unit 105. Based
on an interpretation result of the DCI format, the scheduling
information interpretation unit 1013 generates control information
in order to control the reception unit 105 and the transmission
unit 107, and outputs the control information to the control unit
103.
[0303] The D2D control unit 1015 included in the higher layer
processing unit 101 controls the D2D discovery, the D2D
communication, and/or the ProSe-assisted WLAN direct communication,
based on the various configuration information items/parameters
managed by the radio resource control unit 1011. The D2D control
unit 1015 may generate the information related to the D2D, which is
to be transmitted to the other terminal apparatus 1 or the EUTRAN
(base station apparatus 3).
[0304] Based on control information from the higher layer
processing unit 101, the control unit 103 generates a control
signal for controlling the reception unit 105 and the transmission
unit 107. The control unit 103 outputs the generated control signal
to the reception unit 105 and the transmission unit 107, and
controls the reception unit 105 and the transmission unit 107.
[0305] In accordance with the control signal input from the control
unit 103, the reception unit 105 separates, demodulates, and
decodes the signal received from the base station apparatus 3 via
the transmit-receive antenna unit 109, and outputs decoded
information to the higher layer processing unit 101.
[0306] The radio reception unit 1057 down converts a downlink
signal received via the transmit-receive antenna unit 109 into a
baseband signal by means of quadrature demodulation, removes
unnecessary frequency components, and controls an amplification
level so that a signal level is properly maintained. Based on
in-phase components and quadrature components of the received
signal, the radio reception unit 1057 performs the quadrature
demodulation, and converts a quadrature-modulated analog signal
into a digital signal. The radio reception unit 1057 removes a
portion corresponding to a Cyclic Prefix (CP) from the converted
digital signal, and performs Fast Fourier Transform (FFT) on the
CP-removed signal, thereby extracting a signal in a frequency
domain.
[0307] The demultiplexing unit 1055 separates the extracted signal
respectively into the PHICH, the PDCCH, the EPDCCH, the PDSCH, and
the downlink reference signal. In addition, the demultiplexing unit
1055 performs compensation on a channel of the PHICH, the PDCCH,
the EPDCCH, and the PDSCH based on an estimation value of the
channel which is input from the channel measurement unit 1059. In
addition, the demultiplexing unit 1055 outputs the separated
downlink reference signal to the channel measurement unit 1059.
[0308] The demodulation unit 1053 synthesizes a code corresponding
to the PHICH by multiplexing, and performs demodulation using a
Binary Phase Shift Keying (BPSK) modulation scheme on the
synthesized signal, thereby outputting the signal to the decoding
unit 1051. The decoding unit 1051 decodes the PHICH addressed to
the terminal apparatus 1, and outputs a decoded HARQ indicator to
the higher layer processing unit 101. The demodulation unit 1053
performs the demodulation using a QPSK modulation scheme on the
PDCCH and/or EPDCCH, and outputs the signal to the decoding unit
1051. The decoding unit 1051 attempts to decode the PDCCH and/or
EPDCCH. In a case where the decoding is successful, the decoding
unit 1051 outputs decoded downlink control information and RNTI to
which the downlink control information corresponds, to the higher
layer processing unit 101.
[0309] The demodulation unit 1053 performs the demodulation using a
modulation scheme notified through downlink grant such as
Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude
Modulation (QAM), and 64 QAM, for the PDSCH, and outputs the signal
to the decoding unit 1051. The decoding unit 1051 performs decoding
based on information related to a coding rate notified through the
downlink control information, and outputs decoded downlink data
(transport block) to the higher layer processing unit 101.
[0310] The channel measurement unit 1059 measures a path loss or a
channel state of the downlink, based on the downlink reference
signal input from the demultiplexing unit 1055, and outputs the
measured path loss or the measured channel state to the higher
layer processing unit 101. In addition, the channel measurement
unit 1059 calculates an estimation value of the downlink channel,
based on the downlink reference signal, and outputs the estimation
value to the demultiplexing unit 1055. The channel measurement unit
1059 performs channel measurement and/or interference measurement
in order to calculate a CQI.
[0311] In accordance with the control signal input from the control
unit 103, the transmission unit 107 generates the uplink reference
signal, encodes and modulates uplink data (transport block) input
from the higher layer processing unit 101, multiplexes the PUCCH,
the PUSCH, and the generated uplink reference signal, and transmits
the signal to the base station apparatus 3 via the transmit-receive
antenna unit 109.
[0312] The encoding unit 1071 performs encoding such as convolution
encoding and block encoding on the uplink control information input
from the higher layer processing unit 101. In addition, the
encoding unit 1071 performs turbo encoding based on information
used in scheduling of the PUSCH.
[0313] The modulation unit 1073 modulates an encoded bit input from
the encoding unit 1071 using a modulation scheme notified through
the downlink control information such as the BPSK, the QPSK, the 16
QAM, and the 64 QAM, or using a modulation scheme which is
predetermined for each channel. The modulation unit 1073 determines
the number of sequences of data to be spatially multiplexed, based
on the information used in scheduling of the PUSCH, and uses
Multiple Input Multiple Output (MIMO) Spatial Multiplexing (SM). In
this manner, the modulation unit 1073 performs mapping of multiple
uplink data items transmitted through the same PUSCH into multiple
sequences, and performs precoding on these sequences.
[0314] The uplink reference signal generation unit 1079 generates a
sequence obtained by a predetermined rule (equation), based on a
physical layer cell identity (called a PCI or a Cell ID) used for
identifying the base station apparatus 3, a bandwidth for arranging
the uplink reference signal, a cyclic shift notified through the
uplink grant, and a value of parameters for generating a DMRS
sequence. In accordance with the control signal input from the
control unit 103, the multiplexing unit 1075 performs Discrete
Fourier Transform (DFT) after rearranging modulation symbols of the
PUSCH in parallel. In addition, the multiplexing unit 1075
multiplexes signals of the PUCCH and the PUSCH and the generated
uplink reference signal for each transmit antenna port. That is,
the multiplexing unit 1075 arranges the signals of the PUCCH and
the PUSCH and the generated uplink reference signal in a resource
element for each transmit antenna port.
[0315] The radio transmission unit 1077 performs Inverse Fast
Fourier Transform (IFFT) on the multiplexed signal, generates an
SC-FDMA symbol, adds a CP to the generated SC-FDMA symbol,
generates a digital signal of a base band, converts the digital
signal of the baseband into an analog signal, removes an excessive
frequency component using a low pass filter, up converts the signal
into a carrier frequency, amplifies power, and transmits the signal
by outputting the signal to the transmit-receive antenna unit
109.
[0316] FIG. 8 is a schematic block diagram illustrating a
configuration of the base station apparatus 3 according to the
present embodiment. As illustrated, the base station apparatus 3 is
configured to include a higher layer processing unit 301, a control
unit 303, a reception unit 305, a transmission unit 307, and a
transmit-receive antenna unit 309. In addition, the higher layer
processing unit 301 is configured to include a radio resource
control unit 3011, a scheduling unit 3013, and a D2D control unit
3015. In addition, the reception unit 305 is configured to include
a decoding unit 3051, a demodulation unit 3053, a demultiplexing
unit 3055, a radio reception unit 3057, and a channel measurement
unit 3059. In addition, the transmission unit 307 is configured to
include an encoding unit 3071, a modulation unit 3073, a
multiplexing unit 3075, a radio transmission unit 3077, and a
downlink reference signal generation unit 3079.
[0317] The higher layer processing unit 301 performs processing for
the Medium Access Control (MAC) layer, the Packet Data Convergence
Protocol (PDCP) layer, the radio Link Control (RLC) layer, and the
Radio Resource Control (RRC) layer. In addition, the higher layer
processing unit 301 generates control information for controlling
the reception unit 305 and the transmission unit 307, and outputs
the control information to the control unit 303.
[0318] The radio resource control unit 3011 included in the higher
layer processing unit 301 generates downlink data which is arranged
in the PDSCH of the downlink (transport block), system information,
an RRC message, and an MAC Control Element (CE), or acquires them
from a higher node, and outputs them to the transmission unit 307.
In addition, the radio resource control unit 3011 manages various
configuration information items/parameters of each terminal
apparatus 1. The radio resource control unit 1011 may set the
various configuration information items/parameters for each
terminal apparatus 1 via the higher layer signal. That is, the
radio resource control unit 1011 transmits/broadcasts information
indicating the various configuration information
items/parameters.
[0319] The scheduling unit 3013 included in the higher layer
processing unit 301 determines a frequency and a subframe to which
a physical channel (PDSCH and PUSCH) are to be allocated, an
encoding rate, a modulation scheme, and transmission power of the
physical channel (PDSCH and PUSCH), based on the received channel
state information, an estimation value of the channel which is
input from the channel measurement unit 3059, and quality of the
channel. The scheduling unit 3013 generates control information
(for example, DCI format) in order to control the reception unit
305 and the transmission unit 307, based on a scheduling result,
and outputs the control information to the control unit 303. The
scheduling unit 3013 further determines timings for performing
transmission processing and reception processing.
[0320] The D2D control unit 3015 included in the higher layer
processing unit 301 controls the D2D discovery, the D2D
communication, and/or the ProSe-assisted WLAN direct communication
in the terminal apparatus 1 which performs communication using the
cellular link, based on the various configuration information
items/parameters managed by the radio resource control unit 3011.
The D2D control unit 3015 may generate the information related to
the D2D, which is to be transmitted to the other base station
apparatus 3 or the terminal apparatus 1.
[0321] Based on control information from the higher layer
processing unit 301, the control unit 303 generates a control
signal for controlling the reception unit 305 and the transmission
unit 307. The control unit 303 outputs the generated control signal
to the reception unit 305 and the transmission unit 307, and
controls the reception unit 305 and the transmission unit 307.
[0322] In accordance with the control signal input from the control
unit 303, the reception unit 305 separates, demodulates, and
decodes the signal received from the terminal apparatus 1 via the
transmit-receive antenna unit 309, and outputs decoded information
to the higher layer processing unit 301. The radio reception unit
3057 down converts an uplink signal received via the
transmit-receive antenna unit 309 into a baseband signal by means
of quadrature demodulation, removes unnecessary frequency
components, and controls an amplification level so that a signal
level is properly maintained. Based on in-phase components and
quadrature components of the received signal, the radio reception
unit 3057 performs the quadrature demodulation, and converts a
quadrature-modulated analog signal into a digital signal.
[0323] The radio reception unit 3057 removes a portion
corresponding to a Cyclic Prefix (CP) from the converted digital
signal. The radio reception unit 3057 performs Fast Fourier
Transform (FFT) on the CP-removed signal, and extracts a signal in
a frequency domain, thereby outputting the signal to the
demultiplexing unit 3055.
[0324] The demultiplexing unit 1055 separates the signal input from
the radio reception unit 3057 into the PUCCH, the PUSCH, and the
uplink reference signal. This separation is determined in advance
by the base station apparatus 3 using the radio resource control
unit 3011, and is performed, based on allocation information of a
radio resource included in the uplink grant which is notified to
each terminal apparatus 1. In addition, the demultiplexing unit
3055 performs compensation on a channel of the PUCCH, and the
PUSCH, based on an estimation value of the channel which is input
from the channel measurement unit 3059. In addition, the
demultiplexing unit 3055 outputs the separated uplink reference
signal to the channel measurement unit 3059.
[0325] The demodulation unit 3053 performs Inverse Discrete Fourier
Transform (IDFT) on the PUSCH, acquires a modulated symbol, and
performs demodulation of the received signal by using a modulation
scheme which is predetermined or which is notified to the terminal
apparatus 1 in advance by the base station apparatus 3 through the
uplink grant, such as the Binary Phase Shift Keying (BPSK), QPSK,
16 QAM, and 64 QAM schemes, for each modulation symbol of the PUCCH
and the PUSCH. Based on the number of sequences which are notified
to each terminal apparatus 1 in advance through the uplink grant
and which are to be spatially multiplexed, and information
instructing precoding to be performed on the sequence, the
demodulation unit 3053 separates multiple modulation symbols of the
uplink data which is transmitted through the same PUSCH using the
MINO SM.
[0326] The decoding unit 3051 performs decoding on an encoded bit
of the demodulated PUCCH and PUSCH by using an encoding rate in a
predetermined encoding scheme which is predetermined or which is
notified to the terminal apparatus 1 in advance by the base station
apparatus 3 through the uplink grant, and outputs the decoded
uplink data and uplink control information to the higher layer
processing unit 101. In a case where the PUSCH is re-transmitted,
the decoding unit 3051 performs decoding using the encoded bit held
by the HARQ buffer which is to be input from the higher layer
processing unit 301 and the demodulated encoded bit. The channel
measurement unit 309 measures an estimation value of the channel
and quality of the channel, based on the uplink reference signal
input from the demultiplexing unit 3055, and outputs both of theses
to the demultiplexing unit 3055 and the higher layer processing
unit 301.
[0327] In accordance with the control signal input from the control
unit 303, the transmission unit 307 generates the downlink
reference signal, encodes and modulates the HARQ indicator, the
downlink control information, and the downlink data which are input
from the higher layer processing unit 301, multiplexes the PHICH,
the PDCCH, the EPDCCH, the PDSCH, and the downlink reference
signal, and transmits the signal to the terminal apparatus 1 via
the transmit-receive antenna unit 309.
[0328] The encoding unit 3071 performs encoding on the HARQ
indicator, the downlink control information, and the downlink data
which are input from the higher layer processing unit 301 by using
a predetermined encoding scheme such as the block encoding, the
convolution encoding, and the turbo encoding, or performs the
encoding by using an encoding scheme determined by the radio
resource control unit 3011. The modulation unit 3073 modulates an
encoded bit input from the encoding unit 3071 by using a modulation
scheme which is predetermined such as the BPSK, the QPSK, the 16
QAM, and the 64 QAM, or by using a modulation scheme which is
determined by the radio resource control unit 3011.
[0329] The downlink reference signal generation unit 3079 generates
a sequence as the downlink reference signal, which is known to the
terminal apparatus 1 and which is obtained by a predetermined rule,
based on a physical layer cell identity (PCI) used for identifying
the base station apparatus 3. The multiplexing unit 3075
multiplexes the modulated symbol of each modulated channel and the
generated downlink reference signal. That is, the multiplexing unit
3075 arranges the modulated symbol of each modulated channel and
the generated downlink reference signal in a resource element.
[0330] The radio transmission unit 3077 performs Inverse Fast
Fourier Transform (IFFT) on the multiplexed modulated symbol,
generates an OFDM symbol, adds a CP to the generated OFDM symbol,
generates a digital signal of a base band, converts the digital
signal of the base band into an analog signal, removes an excessive
frequency component using a low pass filter, up converts the signal
into a carrier frequency, amplifies power, and transmits the signal
by outputting the signal to the transmit-receive antenna unit
309.
[0331] The terminal apparatus 1 according to the present embodiment
is the terminal apparatus 1 which communicates with the other
terminal apparatus 1 and the base station apparatus 3 (EUTRAN), and
includes the reception unit 105 which receives information
indicating the length of the cyclic prefix for the D2D signal to be
transmitted to the other terminal apparatus 1 and information
indicating the length of the cyclic prefix for the uplink signal to
be transmitted to the base station apparatus 3, from the base
station apparatus 3.
[0332] The terminal apparatus 1 according to the present embodiment
includes the transmission unit 107 which determines whether to
transmit both the uplink signal to be transmitted to the base
station apparatus 3 and the D2D signal to be transmitted to the
other terminal apparatus 1 or any one of the uplink signal to be
transmitted to the base station apparatus 3 and the D2D signal to
be transmitted to the other terminal apparatus 1, based on at least
whether or not the transmission timing of the uplink signal to be
transmitted to the base station apparatus 3 and the transmission
timing of the D2D signal to be transmitted to the other terminal
apparatus 1 are the same as each other and/or whether or not the
length of the cyclic prefix for the uplink signal to be transmitted
to the base station apparatus 3 and the length of the cyclic prefix
for the D2D signal to be transmitted to the other terminal
apparatus 1 are the same as each other, if the uplink signal to be
transmitted to the base station apparatus 3 and the D2D signal to
be transmitted to the other terminal apparatus 1 occur
simultaneously in the same cell.
[0333] The above-described transmission unit 107 may transmit both
the uplink signal to be transmitted to the base station apparatus 3
and the D2D signal to be transmitted to the other terminal
apparatus 1, if the uplink signal to be transmitted to the base
station apparatus 3 and the D2D signal to be transmitted to the
other terminal apparatus 1 occurs simultaneously in different
cells.
[0334] The above-described transmission unit 107 may transmit any
one of the uplink signal to be transmitted to the base station
apparatus 3 and the D2D signal to be transmitted to the other
terminal apparatus 1, if the uplink signal to be transmitted to the
base station apparatus 3 and the D2D signal to be transmitted to
the other terminal apparatus 1 occurs simultaneously in different
cells.
[0335] The terminal apparatus 1 according to the present embodiment
includes the D2D control unit 1015 which flushes all the HARQ
buffers related to the transmission processing to the other
terminal apparatus 1, in a case where the TA timer related to the
PTAG expires.
[0336] The above-described D2D control unit 1015 flushes all of the
soft buffers related to the reception processing from the other
terminal apparatus 1, in a case where the TA timer related to the
PTAG expires.
[0337] The above-described D2D control unit 1015 stops/disconnects
the communication (D2D communication and ProSe-assisted WLAN direct
communication) with the other terminal apparatus 1, in a case where
the TA timer related to the PTAG expires.
[0338] The above-described transmission unit 107 does not transmit
the D2D signal to the other terminal apparatus 1, in a case where
the TA timer related to the PTAG is not running.
[0339] The above-described D2D control unit 1015 flushes all of the
HARQ buffers related to the transmission processing to the other
terminal apparatus 1 for all the serving cells belonging to the
STAG, in a case where the TA timer related to the STAG expires.
[0340] The above-described D2D control unit 1015 flushes all of the
soft buffers related to the reception processing from the other
terminal apparatus 1 for all the serving cells belonging to the
STAG, in a case where the TA timer related to the STAG expires.
[0341] The above-described D2D control unit 1015 stops/disconnects
the communication (D2D communication and ProSe-assisted WLAN direct
communication) with the other terminal apparatus 1 in all the
serving cells belonging to the STAG, in a case where the TA timer
related to the STAG expires.
[0342] The above-described transmission unit 107 does not transmit
the D2D signal to the other terminal apparatus 1 in the D2D
resource related to the STAG, in a case where the TA timer related
to the STAG is not running.
[0343] The above-described D2D control unit 1015 activates and
deactivates the function of the communication between the terminal
apparatuses 1 in the MAC layer.
[0344] The above-described D2D control unit 1015 activates and
deactivates the function of the communication between the terminal
apparatuses 1, based on the input by the user or by the
application.
[0345] The above-described D2D control unit 1015 activates and
deactivates the function of the communication between the terminal
apparatuses 1, based on the D2D command (information) received from
the base station apparatus 3.
[0346] The above-described transmission unit 107 transmits ACK for
the transport block including the D2D command (information) through
the PUSCH or the PUCCH to the base station apparatus 3.
[0347] The above-described transmission unit 107 transmits the
information indicating that the function of the communication
between the terminal apparatuses 1 is activated, to the base
station apparatus 3.
[0348] The above-described transmission unit 107 transmits the
information indicating that the function of the communication
between the terminal apparatuses 1 is deactivated, to the base
station apparatus 3.
[0349] The above-described D2D control unit 1015 starts or restarts
the timer when the function of the communication between the
terminal apparatuses 1 is activated or re-activated, and
deactivates the function of the communication between the terminal
apparatuses 1 in a case where the timer expires.
[0350] The above-described D2D control unit 1015 flushes all of the
HARQ buffers related to the transmission processing to the other
terminal apparatus 1 in a case where the function of the
communication between the terminal apparatuses 1 is
deactivated.
[0351] The above-described D2D control unit 1015 flushes all of the
soft buffers related to the reception processing from the other
terminal apparatus 1 in a case where the function of the
communication between the terminal apparatuses 1 is
deactivated.
[0352] The terminal apparatus 1 according to the present embodiment
can perform and then start communication between the terminal
apparatuses 1, in a case where the function of the communication
between the terminal apparatuses 1 is activated. In addition, the
terminal apparatus 1 according to the present embodiment does not
perform and then does not start communication between the terminal
apparatuses 1, in a case where the function of the communication
between the terminal apparatuses 1 is deactivated.
[0353] The above-described reception unit 105 does not perform
reception processing and monitoring of the D2D signal from the
other terminal apparatus 1, in a case where the function of the
communication between the terminal apparatuses 1 is deactivated.
The above-described reception unit 105 may perform reception
processing and monitoring of the D2D signal from the other terminal
apparatus 1, in a case where the function of the communication
between the terminal apparatuses 1 is activated.
[0354] The above-described transmission unit 107 does not perform
transmission processing of the D2D signal to the other terminal
apparatus 1, in a case where the function of the communication
between the terminal apparatuses 1 is deactivated. The
above-described transmission unit 107 may perform transmission
processing of the D2D signal to the other terminal apparatus 1, in
a case where the function of the communication between the terminal
apparatuses 1 is activated.
[0355] The above-described transmission unit 107 transmits the
information related to the function of the communication with the
other terminal apparatus 1 to the base station apparatus 3. The
information related to the function of the communication with the
other terminal apparatus 1 includes part or all of the distinct
information items (G1 to G17).
[0356] The information related to the function of the communication
with the other terminal apparatus 1 includes the information
indicating standards of the wireless LAN supported by the terminal
apparatus 1.
[0357] The information related to the function of the communication
with the other terminal apparatus 1 includes the information
indicating whether or not the terminal apparatus 1 supports
capability to simultaneously perform the communication with the
base station apparatus 3 and the wireless LAN direct
communication.
[0358] The information related to the function of the communication
with the other terminal apparatus 1 includes the information
indicating whether or not the terminal apparatus 1 supports
capability to simultaneously perform the communication with the
base station apparatus 3 in a certain cell and the communication
with the other terminal apparatus 1 in the certain cell.
[0359] The information related to the function of the communication
with the other terminal apparatus 1 includes the information
indicating whether or not the terminal apparatus 1 supports
capability to simultaneously perform the communication with the
base station apparatus 3 in a certain cell and the communication
with the other terminal apparatus 1 in another certain cell.
[0360] The above-described transmission unit transmits the
information related to the communication path with the other
terminal apparatus 1, to the base station apparatus 3. The
information related to the communication path with the other
terminal apparatus 1 partially or entirely includes the distinct
information items (I1 to I42).
[0361] The information related to the communication path with the
other terminal apparatus 1 includes the information indicating a
resource used for communicating with the other terminal apparatus
1.
[0362] The information related to the communication path with the
other terminal apparatus 1 includes the information indicating a
band used for communicating with the other terminal apparatus
1.
[0363] The information related to the communication path with the
other terminal apparatus 1 includes the information indicating a
cell used for communicating with the other terminal apparatus
1.
[0364] The information related to the communication path with the
other terminal apparatus 1 includes the information indicating a
subframe used for communicating with the other terminal apparatus
1.
[0365] The information related to the communication path with the
other terminal apparatus 1 includes the information indicating a CP
length of a signal to be transmitted to the other terminal
apparatus 1.
[0366] The information related to the communication path with the
other terminal apparatus 1 includes the information indicating
whether or not the wireless LAN communication with the other
terminal apparatus 1 is performed.
[0367] The information related to the communication path with the
other terminal apparatus 1 includes the information indicating an
amount of traffic which is transmitted to the other terminal
apparatus 1.
[0368] The information related to the communication path with the
other terminal apparatus 1 includes the information indicating an
amount of traffic which is received from the other terminal
apparatus 1.
[0369] The information related to the communication path with the
other terminal apparatus 1 includes the information related to the
QoS in the communication path with the other terminal apparatus
1.
[0370] The base station apparatus 3 according to the present
embodiment is the base station apparatus 3 that communicates with
the terminal apparatus 1 which communicates with the other terminal
apparatus 1, and includes the transmission unit 307 that transmits
the information indicating the length of the cyclic prefix for the
signal transmitted to the other terminal apparatus 1 by the
terminal apparatus 1, the information indicating the length of the
cyclic prefix for the signal transmitted to the base station
apparatus 3 by the terminal apparatus 1, the information related to
the function of the communication with the other terminal apparatus
1, the information related to the communication path with the other
terminal apparatus 1, the information instructing to activate the
function of the communication between the terminal apparatuses 1,
and the information instructing to deactivate the function of the
communication between the terminal apparatuses 1, to the terminal
apparatus 1.
[0371] The base station apparatus 3 according to the present
embodiment includes the reception unit 305 which receives the
information indicating that the function of the communication
between the terminal apparatuses 1 is activated and the information
indicating that the function of the communication between the
terminal apparatuses 1 is deactivated.
[0372] The above-described reception unit 305 receives the ACK for
the transport block including the information instructing to
activate the function of the communication between the terminal
apparatuses 1 and the ACK including the information instructing to
deactivate the function of the communication between the terminal
apparatuses 1, from the terminal apparatus 1, through the PUSCH or
the PUCCH.
[0373] In this manner, the D2D can be efficiently performed between
the terminal apparatuses 1. In addition, the base station apparatus
3 can efficiently control the D2D between the terminal apparatuses
1 by using the cellular link.
[0374] A program for operating the base station apparatus 3 and the
terminal apparatus 1 according to the present invention may be a
program (program which causes a computer to execute a process) for
controlling a Central Processing Unit (CPU) so as to realize
functions of the above-described embodiment according to the
present invention. Then, information items handled by these
apparatuses are temporarily accumulated in a Random Access Memory
(RAM) during the processing, and then are stored in various types
of Read Only Memory (ROM) such as a Flash ROM or a Hard Disk Drive
(HDD) so as to be read out, corrected, and written by the CPU when
necessary.
[0375] The terminal apparatus 1 and the base station apparatus 3
may be partially realized by a computer. In this case, a program
for realizing a control function thereof may be recorded in a
computer-readable recording medium. The program recorded in the
recording medium may be read out and executed so as to realize the
control function.
[0376] A "computer system" herein is a computer system incorporated
in the terminal apparatus 1 or the base station apparatus 3, and
includes an OS or hardware such as peripheral devices. In addition,
the "computer-readable recording medium" means a storage device
such as a flexible disk, a magneto-optical disk, a portable medium
such as the ROM and a CD-ROM, and the hard disk incorporated in the
computer system.
[0377] Furthermore, the "computer-readable recording medium"
represents those which hold a program dynamically in a short time,
such as a communication line in a case where the program is
transmitted via a network such as the Internet or a communication
circuit such as a telephone circuit, and may include those which
hold the program for a fixed period of time, such as a volatile
memory inside the computer system serving as a server or a client
in the above-described case. In addition, the above-described
program may be those which partially realize the above-described
function, and further may be those which can realize the
above-described function in combination with another program
already recorded in the computer system.
[0378] In addition, the base station apparatus 3 according to the
above-described embodiment can also be realized as an assembly body
(apparatus group) configured to have multiple apparatuses. Each
apparatus configuring the apparatus group may partially or entirely
include each function or each functional block of the base station
apparatus 3 according to the above-described embodiment. As the
apparatus group, it may be sufficient enough as long as the base
station apparatus 3 is provided with each general function or each
general functional block. In addition, the terminal apparatus 1
according to the above-described embodiment can also communicate
with the base station apparatus serving as the assembly body.
[0379] In addition, the base station apparatus 3 according to the
above-described embodiment may be the Evolved Universal Terrestrial
Radio Access Network (EUTRAN). In addition, the base station
apparatus 3 according to the above-described embodiment may
partially or entirely have the function of the higher node for
eNodeB.
[0380] In addition, the terminal apparatus 1 and the base station
apparatus 3 according to the above-described embodiment may be
partially or entirely realized as an LSI typically serving as an
integrated circuit, or as a chip set. Each functional block of the
terminal apparatus 1 and the base station apparatus 3 may be
individually incorporated in a chip, or may be partially or
entirely integrated into a chip. In addition, a method of circuit
integration is not limited to the LSI, and may be realized by a
dedicated circuit or a general-purpose processor. In addition, in a
case where an advanced semiconductor technology introduces a new
integrated circuit technology for replacing the LSI, the technology
enables the integrated circuit to be used.
[0381] In addition, in the above-described embodiment, the terminal
apparatus has been described as an example of the communication
apparatus. However, the present invention is not limited thereto.
The present invention can also be applied to the terminal apparatus
or the communication apparatus of a stationary type or a non-mobile
type electronic device which is installed indoors and outdoors, for
example, such as AV equipment, kitchen equipment, cleaning-washing
machines, air-conditioning equipment, office equipment, vending
machines, and other household equipment.
[0382] Hitherto, the embodiment of the invention has been described
in detail with reference to the drawings. A specific configuration
is not limited to the embodiment, and includes design modification
within a scope not departing from the gist of the invention. In
addition, the present invention can be modified in various ways
within the scope disclosed in Claims. An embodiment obtained by
appropriately combining technical means disclosed in each different
embodiment is also included in the technical scope of the present
invention. In addition, a configuration of replacing elements
providing the same advantageous effect with each other, which are
the elements disclosed in the above-described respective
embodiments, is also included therein.
APPENDIX 1
[0383] There is provided a terminal apparatus that communicates
with an Evolved Universal Terrestrial Radio Network (EUTRAN). The
terminal apparatus includes a reception unit which receives first
information indicating a length of a cyclic prefix for an
inter-terminal apparatus signal transmitted to the other terminal
apparatus and second information indicating a length of a cyclic
prefix for an uplink signal in the EUTRAN, from a base station
apparatus of the EUTRAN.
APPENDIX 2
[0384] In the terminal apparatus disclosed in Appendix 1, the
inter-terminal apparatus signal includes a signal related to
discovery between terminal apparatuses and a signal related to
communication between the terminal apparatuses, and the first
information individually indicates the length of the cyclic prefix
for the signal related to the discovery between the terminal
apparatuses and the length of the cyclic prefix for the signal
related to the communication between the terminal apparatuses.
APPENDIX 3
[0385] In the terminal apparatus disclosed in Appendix 1, the
reception unit receives the first information related to each of
multiple sets of resources for the inter-terminal apparatus signal
from the base station apparatus of the EUTRAN.
APPENDIX 4
[0386] The terminal apparatus disclosed in Appendix 1 further
includes a transmission unit which notifies the other terminal
apparatus of the length of the cyclic prefix for the inter-terminal
apparatus signal.
APPENDIX 5
[0387] In the terminal apparatus disclosed in Appendix 1, the
resources for the inter-terminal apparatus signal are resources of
an uplink component carrier of a cell in a frequency division
duplex system in the EUTRAN, or resources of uplink subframes in a
time division duplex system in the EUTRAN.
APPENDIX 6
[0388] In the terminal apparatus disclosed in Appendix 1, the
reception unit detects the length of the cyclic prefix of a
downlink signal, based on the downlink signal in the EUTRAN.
APPENDIX 7
[0389] There is provided a base station apparatus in an Evolved
Universal Terrestrial Radio Network (EUTRAN) which communicates
with a terminal apparatus. The base station apparatus includes a
transmission unit which transmits first information indicating a
length of a cyclic prefix for an inter-terminal apparatus signal
transmitted to the other terminal apparatus and second information
indicating a length of a cyclic prefix for an uplink signal in the
EUTRAN, to the terminal apparatus.
APPENDIX 8
[0390] In the base station apparatus disclosed in Appendix 7, the
inter-terminal apparatus signal includes a signal related to
discovery between the terminal apparatuses and a signal related to
communication between the terminal apparatuses, and the first
information individually indicates the length of the cyclic prefix
for the signal related to the discovery between the terminal
apparatuses and the length of the cyclic prefix for the signal
related to the communication between the terminal apparatuses.
APPENDIX 9
[0391] In the base station apparatus disclosed in Appendix 7, the
transmission unit transmits the first information related to each
of multiple sets of resources for the inter-terminal apparatus
signal to the terminal apparatus.
APPENDIX 10
[0392] In the base station apparatus disclosed in Appendix 7, the
terminal apparatus notifies the other terminal apparatus of the
length of the cyclic prefix for the inter-terminal apparatus
signal.
APPENDIX 11
[0393] In the base station apparatus disclosed in Appendix 7, the
resources for the inter-terminal apparatus signal are resources of
an uplink component carrier of a cell in a frequency division
duplex system in the EUTRAN, or resources of an uplink subframe in
a time division duplex system in the EUTRAN.
INDUSTRIAL APPLICABILITY
[0394] An aspect of the present invention can be applied to a
terminal apparatus which needs to efficiently perform D2D.
REFERENCE SIGNS LIST
[0395] 1 (1A, 1B, 1C) terminal apparatus [0396] 3 base station
apparatus [0397] 101 higher layer processing unit [0398] 103
control unit [0399] 105 reception unit [0400] 107 transmission unit
[0401] 109 transmit-receive antenna unit [0402] 301 higher layer
processing unit [0403] 303 control unit [0404] 305 reception unit
[0405] 307 transmission unit [0406] 309 transmit-receive antenna
unit [0407] 1011 radio resource control unit [0408] 1013 scheduling
information interpretation unit [0409] 1015 D2D control unit [0410]
3011 radio resource control unit [0411] 3013 scheduling unit [0412]
3015 D2D control unit
* * * * *