U.S. patent application number 16/245974 was filed with the patent office on 2019-05-16 for terminal device, base station device, integrated circuit, and communication method.
The applicant listed for this patent is SHARP KABUSHIKI KAISHA. Invention is credited to TATSUSHI AIBA, SHOICHI SUZUKI, HIROKI TAKAHASHI, KAZUNARI YOKOMAKURA.
Application Number | 20190150128 16/245974 |
Document ID | / |
Family ID | 57144126 |
Filed Date | 2019-05-16 |
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United States Patent
Application |
20190150128 |
Kind Code |
A1 |
SUZUKI; SHOICHI ; et
al. |
May 16, 2019 |
TERMINAL DEVICE, BASE STATION DEVICE, INTEGRATED CIRCUIT, AND
COMMUNICATION METHOD
Abstract
A terminal device receives a control channel including a DCI
format and transmits a PUSCH, in which the DCI format includes an
uplink index and information for indicating a HARQ process number;
when both a first bit and a second bit of the uplink index are set
to 1, the HARQ process number in the PUSCH corresponding to the
first bit is X and the HARQ process number in the PUSCH
corresponding to the second bit is mod (X+1, Z); the mod (X+1, Z)
is a function outputting a remainder when dividing (X+1) by Z; the
X is determined based on the information for indicating the HARQ
process number; and the Z is a value identical to a maximum number
of HARQ processes in a serving cell determined by an
uplink/downlink configuration.
Inventors: |
SUZUKI; SHOICHI; (Sakai
City, JP) ; AIBA; TATSUSHI; (Sakai City, JP) ;
YOKOMAKURA; KAZUNARI; (Sakai City, JP) ; TAKAHASHI;
HIROKI; (Sakai City, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SHARP KABUSHIKI KAISHA |
Osaka |
|
JP |
|
|
Family ID: |
57144126 |
Appl. No.: |
16/245974 |
Filed: |
January 11, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15568783 |
Oct 23, 2017 |
10219266 |
|
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PCT/JP2016/061247 |
Apr 6, 2016 |
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16245974 |
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Current U.S.
Class: |
370/329 |
Current CPC
Class: |
H04L 29/08 20130101;
H04W 72/04 20130101; H04W 72/042 20130101; H04L 1/1896 20130101;
H04W 72/14 20130101; H04L 1/1864 20130101; H04L 1/1861 20130101;
H04L 1/1822 20130101; H04L 1/18 20130101; H04L 1/1887 20130101;
H04L 1/1812 20130101 |
International
Class: |
H04W 72/04 20060101
H04W072/04; H04L 1/18 20060101 H04L001/18; H04L 29/08 20060101
H04L029/08 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 24, 2015 |
JP |
2015-089377 |
Claims
1. A terminal device comprising: reception circuitry configured to
and/or programmed to receive a control channel including a downlink
control information (DCI) format; and transmission circuitry
configured to and/or programmed to transmit a first physical uplink
shared channel (PUSCH) in a first subframe and a second PUSCH in a
second subframe, wherein the DCI format includes information for
indicating a hybrid automatic repeat request (HARQ) process number,
the HARQ process number of the second PUSCH is mod (X+1, Z), the X
is determined based on the information for indicating the HARQ
process number.
2. The terminal device according to claim 1, wherein the Z is a
value identical to a number of HARQ processes in a serving
cell.
3. A base station device comprising: transmission circuitry
configured to and/or programmed to transmit a control channel
including a downlink control information (DCI) format; and
reception circuitry configured to and/or programmed to receive a
first physical uplink shared channel (PUSCH) in a first subframe
and a second PUSCH in a second subframe, wherein the DCI format
includes information for indicating a hybrid automatic repeat
request (HARQ) process number, the HARQ process number of the
second PUSCH is mod (X+1, Z), the X is determined based on the
information for indicating the HARQ process number.
4. The base station device according to claim 3, wherein the Z is a
value identical to a number of HARQ processes in a serving
cell.
5. A communication method for a terminal device, the communication
method comprising: receiving a control channel including a downlink
control information (DCI) format; and transmitting a first physical
uplink shared channel (PUSCH) in a first subframe and a second
PUSCH in a second subframe, wherein the DCI format includes
information for indicating a hybrid automatic repeat request (HARQ)
process number, the HARQ process number of the second PUSCH is mod
(X+1, Z), the X is determined based on the information for
indicating the HARQ process number.
6. A communication method for a base station device, the
communication method comprising: transmitting a control channel
including a downlink control information (DCI) format; and
receiving a first physical uplink shared channel (PUSCH) in a first
subframe and a second PUSCH in a second subframe, wherein the DCI
format includes information for indicating a hybrid automatic
repeat request (HARQ) process number, the HARQ process number of
the second PUSCH is mod (X+1, Z), the X is determined based on the
information for indicating the HARQ process number.
Description
TECHNICAL FIELD
[0001] The present invention relates to a terminal device, a base
station device, an integrated circuit, and a communication
method.
[0002] This application claims priority based on JP 2015-089377
filed on Apr. 24, 2015, the contents of which are incorporated
herein by reference.
BACKGROUND ART
[0003] A In the 3rd Generation Partnership Project (3GPP), a radio
access method and a radio network for the cellular mobile
communication (hereinafter referred to as "Long Term Evolution
(LTE)", "Evolved Universal Terrestrial Radio Access (EUTRA)", or
"Evolved Universal Terrestrial Radio Access Network (EUTRAN)") have
been studied. In LTE, a base station device is also referred to as
an evolved NodeB (eNodeB), and a terminal device is also referred
to as user equipment (UE). LTE is a cellular communication system
in which multiple areas each covered by the base station device are
deployed to form a cellular structure. A single base station device
may manage multiple cells.
[0004] LTE supports a time division duplex (TDD). LTE that employs
the TDD scheme is also referred to as TD-LTE or LTE TDD. In TDD,
uplink signals and downlink signals are time division multiplexed.
Furthermore, LTE supports a frequency division duplex (FDD).
[0005] LTE provides a Hybrid Automatic Repeat reQuest (HARQ)
functionality at Medium Access Control (MAC) layers. The HARQ
functionality in the downlink has an asynchronous adaptive HARQ
characteristic, and the HARQ functionality in the uplink has a
synchronous HARQ characteristic (NPL 1). Introduction of the
asynchronous HARQ in the uplink has been studied in the 3GPP (NPL
2).
CITATION LIST
Non-Patent Document
[0006] [NON-PATENT DOCUMENT 1] "3GPP TS 36.300 v12.4.0 Evolved
Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal
Terrestrial Radio Access Network (E-UTRAN); Overall description;
Stage 2", 7 Nov. 2015. [0007] [NON-PATENT DOCUMENT 2] "UL HARQ
considerations for LTE LAA", R2-151551, NVIDIA, 3GPP TSG RAN WG2
Meeting #89bis, 20-24 Apr. 2015.
DISCLOSURE OF THE INVENTION
Problems to be Solved by the Invention
[0008] However, a concrete method for introducing an asynchronous
HARQ in the uplink has not been fully studied. For instance, a
method for switching between a synchronous HARQ and the
asynchronous HARQ in the uplink has not been fully studied.
Further, for instance, a method for identifying a HARQ process
related to an uplink grant has not been fully studied. Moreover,
for instance, a method for processing a HARQ buffer has not been
fully studied.
[0009] The present invention provides a terminal device capable of
efficiently communicating with a base station device, an integrated
circuit mounted on the terminal device, a communication method used
by the terminal device, the base station device communicating with
the terminal device, an integrated circuit mounted on the base
station device, and a communication method used by the base station
device.
Means for Solving the Problems
[0010] (1) The aspects of the present invention are contrived to
provide the following means. A first aspect of the present
invention is a terminal device which includes a reception unit
configured to receive a control channel including a downlink
control information (DCI) format and a transmission unit configured
to transmit a physical uplink shared channel (PUSCH). The DCI
format includes an uplink index and information for indicating a
hybrid automatic repeat request (HARQ) process number; when both a
first bit and a second bit of the uplink index are set to 1, the
HARQ process number in the PUSCH corresponding to the first bit is
X and the HARQ process number in the PUSCH corresponding to the
second bit is mod (X+1, Z); the mod (X+1, Z) is a function
outputting a remainder when dividing (X+1) by Z; the X is
determined based on the information for indicating the HARQ process
number; and the Z is a value identical to a maximum number of HARQ
processes in a serving cell determined by an uplink/downlink
configuration.
[0011] (2) A second aspect of the present invention is a base
station device which includes a transmission unit configured to
transmit a control channel including a downlink control information
(DCI) format and a reception unit configured to receive a physical
uplink shared channel (PUSCH). The DCI format includes an uplink
index and information for indicating a hybrid automatic repeat
request (HARQ) process number; when both a first bit and a second
bit of the uplink index are set to 1, the HARQ process number in
the PUSCH corresponding to the first bit is X and the HARQ process
number in the PUSCH corresponding to the second bit is mod (X+1,
Z); the mod (X+1, Z) is a function outputting a remainder when
dividing (X+1) by Z; the X is determined based on the information
for indicating the HARQ process number; and the Z is a value
identical to a maximum number of HARQ processes in a serving cell
determined by an uplink/downlink configuration.
[0012] (3) A third aspect of the present invention is a
communication method for a terminal device which includes receiving
a control channel including a downlink control information (DCI)
format and transmitting a physical uplink shared channel (PUSCH).
The DCI format includes an uplink index and information for
indicating a hybrid automatic repeat request (HARQ) process number;
when both a first bit and a second bit of the uplink index are set
to 1, the HARQ process number in the PUSCH corresponding to the
first bit is X and the HARQ process number in the PUSCH
corresponding to the second bit is mod (X+1, Z); the mod (X+1, Z)
is a function outputting a remainder when dividing (X+1) by Z; the
X is determined based on the information for indicating the HARQ
process number; and the Z is a value identical to a maximum number
of HARQ processes in a serving cell determined by an
uplink/downlink configuration.
[0013] (4) A fourth aspect of the present invention is a
communication method for a base station device which includes
transmitting a control channel including a downlink control
information (DCI) format and receiving a physical uplink shared
channel (PUSCH). The DCI format includes an uplink index and
information for indicating a hybrid automatic repeat request (HARQ)
process number; when both a first bit and a second bit of the
uplink index are set to 1, the HARQ process number in the PUSCH
corresponding to the first bit is X and the HARQ process number in
the PUSCH corresponding to the second bit is mod (X+1, Z); the mod
(X+1, Z) is a function outputting a remainder when dividing (X+1)
by Z; the X is determined based on the information for indicating
the HARQ process number; and the Z is a value identical to a
maximum number of HARQ processes in a serving cell determined by an
uplink/downlink configuration.
[0014] (5) A fifth aspect of the present invention is an integrated
circuit, mounted on a terminal device, which includes a reception
circuit configured to receive a control channel including a
downlink control information (DCI) format and a transmission
circuit configured to transmit a physical uplink shared channel
(PUSCH). The DCI format includes an uplink index and information
for indicating a hybrid automatic repeat request (HARQ) process
number; when both a first bit and a second bit of the uplink index
are set to 1, the HARQ process number in the PUSCH corresponding to
the first bit is X and the HARQ process number in the PUSCH
corresponding to the second bit is mod (X+1, Z); the mod (X+1, Z)
is a function outputting a remainder when dividing (X+1) by Z; the
X is determined based on the information for indicating the HARQ
process number; and the Z is a value identical to a maximum number
of HARQ processes in a serving cell determined by an
uplink/downlink configuration.
[0015] (6) A sixth aspect of the present invention is an integrated
circuit, mounted on a base station device, which includes a
transmission circuit configured to transmit a control channel
including a downlink control information (DCI) format and a
reception circuit configured to receive a physical uplink shared
channel (PUSCH). The DCI format includes an uplink index and
information for indicating a hybrid automatic repeat request (HARQ)
process number; when both a first bit and a second bit of the
uplink index are set to 1, the HARQ process number in the PUSCH
corresponding to the first bit is X and the HARQ process number in
the PUSCH corresponding to the second bit is mod (X+1, Z); the mod
(X+1, Z) is a function outputting a remainder when dividing (X+1)
by Z; the X is determined based on the information for indicating
the HARQ process number; and the Z is a value identical to a
maximum number of HARQ processes in a serving cell determined by an
uplink/downlink configuration.
Effects of the Invention
[0016] According to the present invention, the terminal device can
efficiently communicate with the base station device.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1 is a conceptual diagram of a radio communication
system according to the present embodiment.
[0018] FIG. 2 is a diagram illustrating an example of a MAC layer
structure in an uplink in which a carrier aggregation scheme is
configured according to the present embodiment.
[0019] FIG. 3 is a diagram illustrating an example of a downlink
control information (DCI) format 0 according to the present
embodiment.
[0020] FIG. 4 is a diagram illustrating a schematic configuration
of a radio frame according to the present embodiment.
[0021] FIG. 5 is a table showing an example of a UL-DL
configuration according to the present embodiment.
[0022] FIG. 6 is a diagram illustrating an example of a synchronous
HARQ according to the present embodiment.
[0023] FIG. 7 is a diagram illustrating an example of an
asynchronous HARQ according to the present embodiment.
[0024] FIG. 8 is a table showing an example of the maximum number
of HARQ processes which a HARQ entity corresponding to a TDD
serving cell manages simultaneously according to the present
embodiment.
[0025] FIG. 9 is a table showing another example of the maximum
number of the HARQ processes which a HARQ entity corresponding to a
TDD serving cell manages simultaneously according to the present
embodiment.
[0026] FIG. 10 is a diagram illustrating a first example of a
measure for switching between the synchronous HARQ and the
asynchronous HARQ according to the present embodiment.
[0027] FIG. 11 is a diagram illustrating a second example of the
measure for switching between the synchronous HARQ and the
asynchronous HARQ according to the present embodiment.
[0028] FIG. 12 is a diagram illustrating a third example of the
measure for switching between the synchronous HARQ and the
asynchronous HARQ according to the present embodiment.
[0029] FIG. 13 is a diagram illustrating a fourth example of the
measure for switching between the synchronous HARQ and the
asynchronous HARQ according to the present embodiment.
[0030] FIG. 14 is a diagram illustrating an example of a random
access response according to the present embodiment.
[0031] FIG. 15 is a diagram illustrating an example of an extended
MAC RAR according to the present embodiment.
[0032] FIG. 16 is a schematic block diagram illustrating a
configuration of a terminal device 1 according to the present
embodiment.
[0033] FIG. 17 is a schematic block diagram illustrating a
configuration of a base station device 3 according to the present
embodiment.
MODE FOR CARRYING OUT THE INVENTION
[0034] Embodiments of the present invention will be described
below.
[0035] 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 devices 1A to 1C and a base
station device 3. The terminal devices 1A to 1C are each referred
to as a terminal device 1 below.
[0036] Carrier aggregation will be described below.
[0037] In the present embodiment, multiple serving cells are
configured for the terminal device 1. A technology in which the
terminal device 1 communicates via the multiple serving cells is
referred to as cell aggregation or carrier aggregation. The present
invention may be applied to each of the multiple serving cells
configured for the terminal device 1. Furthermore, the present
invention may be applied to some of the configured multiple serving
cells. Furthermore, the present invention may be applied to each of
groups of the configured multiple serving cells. Furthermore, the
present invention may be applied to some of the groups of the
configured multiple serving cells. In carrier aggregation, multiple
serving cells being configured are also referred to as aggregated
serving cells.
[0038] Time division duplex (TDD) and/or frequency division duplex
(FDD) is applied to a radio communication system according to the
present embodiment. For cell aggregation, the FDD may be applied to
all of the multiple serving cells. For the cell aggregation, the
TDD may be applied to all of the multiple serving cells.
Alternatively, serving cells to which the TDD is applied and
serving cells to which the FDD is applied may be aggregated.
[0039] The multiple serving cells being configured include one
primary cell and one or multiple secondary cells. The primary cell
is a cell in which an initial connection establishment procedure is
executed, a cell in which a connection re-establishment procedure
is started, or a cell indicated as a primary cell in a handover
procedure. Secondary cells may be configured/added at a point in
time of or after the establishment of a radio resource control
(RRC) connection.
[0040] A carrier corresponding to a serving cell in the downlink is
referred to as a downlink component carrier. A carrier
corresponding to a serving cell in the uplink is referred to as an
uplink component carrier. The downlink component carrier and the
uplink component carrier are collectively referred to as a
component carrier. In the FDD, the uplink component carrier and the
downlink component carrier correspond to different carrier
frequencies. In the TDD, the uplink component carrier and the
downlink component carrier correspond to the same carrier
frequency.
[0041] The terminal device 1 can perform simultaneous transmission
and/or reception on multiple physical channels in multiple serving
cells (component carriers). A single physical channel is
transmitted in a single serving cell (component carrier) of the
multiple serving cells (component carriers).
[0042] FIG. 2 illustrates an example of a medium access control
(MAC) layer structure in the uplink with carrier aggregation being
configured according to the present embodiment. In the uplink with
carrier aggregation being configured, one independent HARQ entity
exists for each serving cell (uplink component carrier). The HARQ
entity manages multiple HARQ processes simultaneously. The HARQ
process relates to a HARQ buffer. Accordingly, the HARQ entity
relates to the multiple HARQ buffers. The HARQ process stores MAC
layer data in the HARQ buffer. The HARQ process instructs a
physical layer to transmit the MAC layer data.
[0043] In the uplink with carrier aggregation being configured, at
least one transport block is generated in each serving cell per
transmission time interval (TTI). Each transport block and HARQ
retransmission of the transport block are mapped in a serving cell.
In LTE, TTI is a subframe. The transport block is the MAC layer
data transmitted on an uplink shared channel (UL-SCH).
[0044] In the uplink according to the present embodiment,
"transport block", "MAC protocol data unit (PDU)", "MAC layer
data", "UL-SCH", "UL-SCH data", and "uplink data" denote the same
constituent element.
[0045] Physical channels and physical signals according to the
present embodiment will be described below.
[0046] The uplink radio communication from the terminal device 1 to
the base station device 3 uses the following uplink physical
channels. The uplink physical channels are used to transmit
information output from a higher layer. [0047] Physical uplink
control channel (PUCCH) [0048] Physical uplink shared channel
(PUSCH) [0049] Physical random access channel (PRACH)
[0050] The PUCCH is used to transmit uplink control information
(UCI). The uplink control information includes downlink channel
state information (CSI), a scheduling request (SR) used to request
a PUSCH (uplink-shared channel (UL-SCH)) resource for initial
transmission, and hybrid automatic repeat request ACKnowledgement
(HARQ-ACK) corresponding to the downlink data (transport block, a
MAC protocol data unit (MAC PDU), a downlink-shared channel
(DL-SCH), and a physical downlink shared channel (PDSCH)). The
HARQ-ACK indicates an acknowledgement (ACK) or a
negative-acknowledgement (NACK). The HARQ-ACK is also referred to
as an ACK/NACK, HARQ feedback, a HARQ response, or HARQ control
information.
[0051] The scheduling request includes a positive scheduling
request or a negative scheduling request. The positive scheduling
request requests a UL-SCH resource for initial transmission. The
negative scheduling request does not request a UL-SCH resource for
the initial transmission.
[0052] The PUSCH is used to transmit uplink data (uplink-shared
channel (UL-SCH)). Furthermore, the PUSCH may be used to transmit
the HARQ-ACK and/or channel state information along with the uplink
data. Further, the PUSCH may transmit only the channel state
information. Moreover, the PUSCH may transmit only the HARQ-ACK and
the channel state information.
[0053] Here, the base station device 3 and the terminal device 1
exchange (transmit and receive) signals with each other in higher
layers. The base station device 3 and terminal device 1, for
instance, may transmit and receive radio resource control (RRC)
signaling in an RRC layer. Further, the base station device 3 and
terminal device 1 may transmit and receive a MAC CE in the medium
access control (MAC) layer. Here, the RRC signaling and/or the MAC
CE is also referred to as higher layer signaling. The RRC signaling
and/or the MAC CE are included in the transport block.
[0054] In the present embodiment, the "RRC signaling", "RRC layer
information", an "RRC layer signal", an "RRC layer parameter", an
"RRC message", and an "RRC information element" denote the same
constituent element.
[0055] The PUSCH is used to transmit the RRC signaling and the MAC
CE. Here, the RRC signaling transmitted from the base station
device 3 may be signaling common to multiple terminal devices 1 in
a cell. Further, the RRC signaling transmitted from the base
station device 3 may be dedicated to a certain terminal device 1
(also referred to as dedicated signaling). In other words,
user-device-specific information (unique to user device) is
transmitted through the signaling dedicated to the certain terminal
device 1.
[0056] The PRACH is used to transmit a random access preamble. The
PRACH is used to indicate an initial connection establishment
procedure, a handover procedure, a connection re-establishment
procedure, uplink transmission synchronization (timing adjustment),
and a PUSCH (UL-SCH) resource request.
[0057] The following uplink physical signals are used in the uplink
radio communication. The uplink physical signal is not used to
transmit information output from the higher layer, but is used by a
physical layer. [0058] Uplink reference signal (UL RS)
[0059] The following downlink physical channels are used for the
downlink radio communication from the base station device 3 to the
terminal device 1. The downlink physical channels are used to
transmit the information output from the higher layer. [0060]
Physical broadcast channel (PBCH) [0061] Physical control format
indicator channel (PCFICH) [0062] Physical hybrid automatic repeat
request indicator channel (PHICH) [0063] Physical downlink control
channel (PDCCH) [0064] Enhanced physical downlink control channel
(EPDCCH) [0065] Physical downlink shared channel (PDSCH) [0066]
Physical multicast channel (PMCH)
[0067] The PBCH is used to broadcast a master information block
(MIB), or a broadcast channel (BCH), that is shared by the terminal
devices 1.
[0068] The PCFICH is used to transmit information indicating a
region (OFDM symbols) to be used for transmission of the PDCCH.
[0069] The PHICH is used to transmit a HARQ indicator (HARQ
feedback or acknowledgement information) indicating acknowledgement
(ACK) or negative acknowledgement (NACK) with respect to the uplink
data (uplink shared channel (UL-SCH)) received by the base station
device 3.
[0070] The PDCCH and the EPDCCH are used to transmit downlink
control information (DCI). For the sake of convenience, in the
present embodiment, "PDCCH" includes "EPDCCH". The downlink control
information is also referred to as a DCI format. The downlink
control information transmitted on a single PDCCH includes a
downlink grant and HARQ information, or an uplink grant and HARQ
information. The downlink grant is also referred to as downlink
assignment or downlink allocation. The downlink assignment and the
uplink grant are not transmitted together in a single PDCCH.
[0071] FIG. 3 is a diagram illustrating an example of a DCI format
0 according to the present embodiment. The DCI format 0 includes
the uplink grant and the HARQ information. The DCI format 0
corresponding to the serving cell in which an uplink-downlink
configuration (UL-DL configuration) 0 is configured may include a
UL index field. The UL index indicates a subframe to which the
PUSCH transmission scheduled by the DCI format 0 is adjusted. The
UL index includes a first bit and a second bit. The terminal device
1 adjusts the PUSCH transmission to a first subframe when "1" is
set to the first bit of the UL index. The terminal device 1 adjusts
the PUSCH transmission to a second subframe when "1" is set to the
second bit of the UL index. The terminal device 1 adjusts the PUSCH
transmission to each of the first and second subframes when "1" is
set to both the first and second bits of the UL index.
[0072] The downlink assignment is used to schedule a single PDSCH
in a single cell. The downlink assignment is used to schedule the
PDSCH in the same subframe to which the downlink grant has been
transmitted.
[0073] The uplink grant is used for scheduling of a single PUSCH
within a single cell. The uplink grant is used to schedule a single
PUSCH in the subframe which follows the subframe to which the
uplink grant has been transmitted.
[0074] The HARQ information includes a new data indicator (NDI) and
information indicating the transport block size. The HARQ
information transmitted on the PDCCH with the downlink assignment
also includes information indicating a HARQ process number in the
downlink (downlink HARQ process Identifier/Identity, downlink HARQ
process number). The HARQ information transmitted on the PDCCH with
the uplink grant related to asynchronous HARQ may also include
information indicating a HARQ process number in the uplink (uplink
HARQ process Identifier/Identity, uplink HARQ process number). The
HARQ information transmitted on the PDCCH with the uplink grant
related to synchronous HARQ may not include information indicating
a HARQ process number in the uplink (uplink HARQ process
Identifier/Identity, uplink HARQ process number).
[0075] The NDI indicates initial transmission or retransmission.
The HARQ entity instructs a certain HARQ process to trigger initial
transmission when the NDI provided to the certain HARQ process by
the HARQ information is toggled in comparison with the NDI value
for the previous transmission of the certain HARQ process. The HARQ
entity instructs a certain HARQ process to trigger retransmission
when the NDI provided to the certain HARQ process by the HARQ
information is not toggled in comparison with the NDI value for the
previous transmission of the certain HARQ process. The HARQ process
may determine whether or not the NDI is toggled.
[0076] The HARQ entity identifies a HARQ process related to the
uplink grant and the HARQ information, and delivers the uplink
grant and the HARQ information to the identified HARQ process. The
HARQ process stores the uplink grant and the HARQ information
delivered from the HARQ entity.
[0077] A cyclic redundancy check (CRC) parity bit added to the
downlink control information transmitted on one PDCCH is scrambled
with a cell-radio network temporary identifier (C-RNTI), a semi
persistent scheduling (SPS)C-RNTI, or a temporary C-RNTI. The
C-RNTI and SPS C-RNTI are identifiers for identifying a terminal
device in a cell. The temporary C-RNTI is an identifier for
identifying the terminal device 1 having transmitted a random
access preamble during a contention based random access
procedure.
[0078] The C-RNTI and temporary C-RNTI are used to control the
PDSCH transmission or the PUSCH transmission in a single subframe.
The SPS C-RNTI is used to periodically allocate a resource for the
PDSCH or the PUSCH.
[0079] The PDSCH is used to transmit downlink data (downlink shared
channel (DL-SCH)).
[0080] The PMCH is used to transmit multicast data (multicast
channel (MCH)).
[0081] The following downlink physical signals are used in the
downlink radio communication. The downlink physical signals are not
used to transmit the information output from the higher layer, but
are used by the physical layer. [0082] Synchronization signal (SS)
[0083] Downlink reference signal (DL RS)
[0084] The synchronization signal is used in order for the terminal
device 1 to be synchronized in terms of frequency and time domains
for downlink. In the TDD scheme, the synchronization signal is
mapped to subframes 0, 1, 5, and 6 within a radio frame. In the FDD
scheme, the synchronization signal is mapped to subframes 0 and 5
within a radio frame.
[0085] The downlink reference signal is used for the terminal
device 1 to perform channel compensation on the downlink physical
channel. The downlink reference signal is used in order for the
terminal device 1 to calculate the downlink channel state
information.
[0086] According to the present embodiment, the following five
types of downlink reference signals are used. [0087] Cell-specific
reference signal (CRS) [0088] UE-specific reference signal (URS)
associated with the PDSCH [0089] Demodulation reference signal
(DMRS) associated with the EPDCCH [0090] Non-zero power channel
state information-reference signal (NZP CSI-RS) [0091] Zero power
channel state information-reference signal (ZP CSI-RS) [0092]
Multimedia broadcast and multicast service over single frequency
network reference signal (MBSFN RS) [0093] Positioning reference
signal (PRS)
[0094] The downlink physical channels and the downlink physical
signals are collectively referred to as a downlink signal. The
uplink physical channels and the uplink physical signals are
collectively referred to as an uplink signal. The downlink physical
channels and the uplink physical channels are collectively referred
to as a physical channel. The downlink physical signals and the
uplink physical signals are collectively referred to as a physical
signal.
[0095] The BCH, the MCH, the UL-SCH, and the DL-SCH are transport
channels. Channels used in medium access control (MAC) layers are
referred to as transport channels. A unit of the transport channel
used in the MAC layers is also referred to as a transport block
(TB) or a MAC protocol data unit (PDU). Control of a hybrid
automatic repeat request (HARQ) is performed on each transport
block in the MAC layer. The transport block is a unit of data that
the MAC layer delivers to the physical layer. In the physical
layer, the transport block is mapped to a codeword and subject to
coding processing on a codeword-by-codeword basis.
[0096] The structure of the radio frame in the present embodiment
will be described below.
[0097] LTE supports two types of radio frame structure. The two
types of radio frame structure 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.
[0098] FIG. 4 is a diagram illustrating a schematic configuration
of the radio frame according to the present embodiment. In FIG. 4,
the horizontal axis is a time axis. Each of the type 1 and type 2
radio frames is 10 ms in length and is defined by 10 subframes.
Each of the subframes is 1 ms in length and is defined by two
consecutive slots. Each of the slots is 0.5 ms in length. The i-th
subframe within a radio frame is constituted of the (2.times.i)-th
slot and the (2.times.i+1)-th slot.
[0099] The following three types of subframes are defined in the
frame structure type 2. [0100] Downlink subframe [0101] Uplink
subframe [0102] Special subframe
[0103] The downlink subframe is a subframe reserved for downlink
transmission. The uplink subframe is a subframe reserved for uplink
transmission. The special subframe is constituted 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 sum of
lengths 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
neither the downlink transmission nor the uplink transmission is
performed. Moreover, the special subframe may be constituted only
of the DwPTS and the GP, or may be constituted only of the GP and
the UpPTS.
[0104] A radio frame of the frame structure type 2 is constituted
of at least the downlink subframe, the uplink subframe, and the
special subframe. The constitution of the radio frame of the frame
structure type 2 is indicated by the uplink-downlink configuration
(UL-DL configuration). The terminal device 1 receives information
indicating the UL-DL configuration from the base station device 3.
FIG. 5 is a table showing an example of the UL-DL configuration
according to the present embodiment. In FIG. 5, D denotes a
downlink subframe, U denotes an uplink subframe, and S denotes a
special subframe.
[0105] A synchronous HARQ in the uplink will be described
below.
[0106] In the synchronous HARQ, the HARQ process to which the
uplink grant corresponds is associated with the subframe having
received the uplink grant and/or the subframe from which the PUSCH
(UL-SCH) corresponding to the uplink grant is transmitted. The
terminal device 1, in the synchronous HARQ, determines the HARQ
process to which the uplink grant corresponds by the subframe
having received the uplink grant and/or the subframe from which the
PUSCH (UL-SCH) corresponding to the uplink grant is
transmitted.
[0107] FIG. 6 is a diagram illustrating an example of a synchronous
HARQ according to the present embodiment. In FIG. 6, one subframe
corresponds to one HARQ process. In FIG. 6, the numeral in a box
indicates the corresponding HARQ process number. In the synchronous
HARQ, the HARQ entity determines the HARQ process by the subframe
from which the MAC layer data is transmitted or by the subframe
having detected the DCI format 0 corresponding to the MAC layer
data.
[0108] In FIG. 6, a subframe from which the MAC layer data
corresponding to the uplink grant is transmitted is determined by
the subframe having received the uplink grant. For example, the MAC
layer data corresponding to the uplink grant is transmitted on the
PUSCH in the subframe located four subframes behind the subframe
having received the stated uplink grant.
[0109] In the synchronous HARQ, a HARQ indicator is transmitted on
the PHICH in response to the uplink transmission. The relation
between the subframe where the uplink transmission has been
executed and the subframe where the corresponding PHICH is
transmitted is predetermined. For example, a HARQ indicator
corresponding to the MAC layer data is transmitted on the PHICH at
the subframe located four subframes behind the subframe in which
the stated MAC layer data has been transmitted on the PUSCH.
Further, for example, the MAC layer data is retransmitted on the
PUSCH at the subframe located four subframes behind the subframe
having received NACK on the PHICH.
[0110] An asynchronous HARQ in the uplink will be described
below.
[0111] FIG. 7 is a diagram illustrating an example of the
asynchronous HARQ according to the present embodiment. In FIG. 7,
one subframe corresponds to one HARQ process. In FIG. 7, the
numeral in a box indicates the corresponding HARQ process number.
In the asynchronous HARQ, a HARQ entity determines the HARQ process
by the HARQ information (information indicating a HARQ process
number) included in the DCI format 0. In the asynchronous HARQ, a
HARQ indicator is not transmitted on the PHICH in response to the
uplink transmission. Thus, in the asynchronous HARQ, retransmission
of the MAC layer data is always scheduled via the PDCCH.
[0112] In FIG. 7, the subframe where the MAC layer data
corresponding to the uplink grant is transmitted is determined by
the subframe having received the uplink grant. For example, the MAC
layer data corresponding to the uplink grant is transmitted on the
PUSCH in the subframe located four subframes behind the subframe
having received the stated uplink grant.
[0113] When the DCI format 0 includes a UL index, the DCI format
may include two pieces of information indicating a HARQ process.
When the DCI format 0 includes the UL index, and both a first bit
and a second bit in the UL index are set to "1", one of two HARQ
processes indicated by the two pieces of information which indicate
the HARQ process numbers may correspond to a first subframe to
which the PUSCH transmission is adjusted, and the other of the two
HARQ processes indicated by the two pieces of information which
indicate the HARQ process numbers may correspond to a second
subframe.
[0114] When the DCI format 0 includes the UL index, the DCI format
may include one piece of information indicating a HARQ process.
When the DCI format 0 includes the UL index, and both the first bit
and the second bit in the UL index are set to "1", one HARQ process
indicated by one piece of information which indicates the HARQ
process number may correspond to both the first subframe and the
second subframe to each of which the PUSCH transmission is
adjusted.
[0115] When the DCI format 0 includes the UL index in which the
first bit is set to "1" and the second bit is set to "0", one HARQ
process X indicated by the HARQ information (information indicating
the HARQ process number) may correspond to the PUSCH transmission
adjusted to the first subframe. When the DCI format 0 includes the
UL index in which the first bit is set to "0" and the second bit is
set to "1", the one HARQ process X indicated by the HARQ
information (information indicating a HARQ process number) may
correspond to the PUSCH transmission adjusted to the second
subframe. When the DCI format 0 includes the UL index in which both
the first bit and the second bit are set to "1", the one HARQ
process X indicated by the HARQ information (information indicating
a HARQ process number) may correspond to the PUSCH transmission
(PUSCH transmission corresponding to the first bit) adjusted to the
first subframe, and a HARQ process Y determined by the HARQ process
X may correspond to the PUSCH transmission (PUSCH transmission
corresponding to the second bit) adjusted to the second subframe.
Here, X and Y may have a relation of Y=(X+1) mod Z. Here, Z denotes
the maximum number of the HARQ processes which are simultaneously
managed by the HARQ entity. In other words, the HARQ process number
for the PUSCH corresponding to the second bit in the UL index is
determined at least based on whether or not both the first bit and
the second bit in the UL index are set to 1, and on the information
for indicating the HARQ process number.
[0116] The maximum number Z of the HARQ processes which are
simultaneously managed by one HARQ process will be described
below.
[0117] One HARQ entity corresponding to a FDD serving cell
simultaneously manages eight HARQ processes. The information
indicating a HARQ process number included in the DCI format 0
corresponding to a FDD serving cell to which an asynchronous HARQ
is applied may be 3 bits.
[0118] FIG. 8 is a diagram illustrating an example of the maximum
number of the HARQ processes which are simultaneously managed by a
HARQ entity corresponding to a TDD serving cell according to the
present embodiment. The maximum number of the HARQ processes which
are managed by one HARQ entity corresponding to the TDD serving
cell may be determined by a UL-DL configuration configured for the
TDD serving cell. Information indicating the HARQ process number
included in the DCI format 0 corresponding to the TDD serving cell
to which the asynchronous HARQ is applied may be determined by the
UL-DL configuration configured for the TDD serving cell. In FIG. 8,
when the UL-DL configuration 5 is configured for the TDD serving
cell to which the asynchronous HARQ is applied, the information
indicating the HARQ process number included in the DCI format 0
corresponding to the TDD serving cell is 0 bit.
[0119] FIG. 9 is a diagram illustrating another example of the
maximum number of the HARQ processes which are simultaneously
managed by the HARQ entity corresponding to the TDD serving cell
according to the present embodiment. The maximum number of the HARQ
processes which are managed by one HARQ entity corresponding to the
TDD serving cell may be based on whether the synchronous HARQ or
the asynchronous HARQ is applied to the TDD serving cell. In FIG.
9, when the synchronous HARQ is applied to the TDD serving cell,
the maximum number of the HARQ processes which are managed by one
HARQ entity corresponding to the TDD serving cell is determined by
the UL-DL configuration configured for the TDD serving cell. In
FIG. 9, when asynchronous HARQ is applied to the TDD serving cell,
the maximum number of the HARQ processes which are managed by one
HARQ entity corresponding to the TDD serving cell is eight
regardless of the UL-DL configuration.
[0120] The number of bits of the information indicating the HARQ
process number included in the DCI format 0 corresponding to the
TDD serving cell may be based on whether the synchronous HARQ or
the asynchronous HARQ is applied to the TDD serving cell. In FIG.
9, when asynchronous HARQ is applied to the TDD serving cell, the
number of bits of the information indicating the HARQ process
number included in the DCI format 0 corresponding to the TDD
serving cell is three regardless of the UL-DL configuration.
[0121] The configuration related to HARQ in the RRC layer will be
described below with reference to FIG. 10 to FIG. 13.
[0122] The terminal device 1 may control whether the synchronous
HARQ or asynchronous HARQ is applied to each serving cell including
an uplink component carrier or to each HARQ entity. In other words,
the synchronous HARQ-applied HARQ process and the asynchronous
HARQ-applied HARQ process may not correspond to the same serving
cell. Thus, the synchronous HARQ-applied HARQ process and the
asynchronous HARQ-applied HARQ process may not correspond to the
same HARQ entity.
[0123] The base station device 3 may transmit the RRC layer
information indicating the asynchronous HARQ to the terminal device
1 with respect to a certain serving cell. The terminal device 1, in
the case the RRC layer information indicating the asynchronous HARQ
being configured in the RRC layer, may apply the asynchronous HARQ
to the corresponding serving cell (transmission in the
corresponding serving cell). The terminal device 1, in the case the
RRC layer information indicating the asynchronous HARQ being not
configured in the RRC layer, may apply the synchronous HARQ to the
corresponding serving cell. The RRC layer information indicating
the asynchronous HARQ may be the information indicating
asynchronous HARQ enabling.
[0124] The base station device 3 may transmit, to the terminal
device 1, the RRC layer information indicating the synchronous HARQ
or asynchronous HARQ with respect to a certain serving cell. The
terminal device 1, in the case the RRC layer information indicating
the asynchronous HARQ being configured in the RRC layer, may apply
the asynchronous HARQ to the corresponding serving cell. The
terminal device 1, in the case the RRC layer information indicating
the synchronous HARQ being not configured in the RRC layer, may
apply the synchronous HARQ to the corresponding serving cell.
[0125] FIG. 10 is a diagram illustrating a first example of a
measure for switching between the synchronous HARQ and the
asynchronous HARQ according to the present embodiment. In FIG. 10,
whether synchronous HARQ or asynchronous HARQ is applied in the
serving cell uplink is determined by the type of the serving cell
(the primary cell, the secondary cell). In FIG. 10, regardless of
the RRC layer information, the synchronous HARQ is always applied
to a primary cell uplink (uplink transmission in the primary cell).
In FIG. 10, the synchronous HARQ or the asynchronous HARQ is
applied to a secondary cell uplink (uplink transmission in the
secondary cell) based on the RRC layer information corresponding to
the secondary cell. With the above configuration, the primary cell
can control that the synchronous HARQ is always applied to the
primary cell in the uplink; and the RRC layer can control whether
the synchronous HARQ or asynchronous HARQ is applied to the
secondary cell.
[0126] FIG. 11 is a diagram illustrating a second example of a
measure for switching between the synchronous HARQ and the
asynchronous HARQ according to the present embodiment. In FIG. 11,
whether the synchronous HARQ or the asynchronous HARQ is applied in
the uplink is determined by a radio network temporary identifier
(RNTI) to which the uplink grant corresponds. In FIG. 11,
regardless of the RRC layer information, the synchronous HARQ is
always applied to the MAC layer data (uplink data transmission)
corresponding to the uplink grant received on the PDCCH including
the CRC parity bit scrambled by the temporary C-RNTI or the SPS
C-RNTI. In FIG. 11, based on the RRC layer information, the
synchronous HARQ or the asynchronous HARQ is applied to the MAC
layer data corresponding to the uplink grant received on the PDCCH
including the CRC parity bit scrambled by the C-RNTI.
[0127] FIG. 12 is a diagram illustrating a third example of a
measure for switching between the synchronous HARQ and the
asynchronous HARQ according to the present embodiment. In FIG. 12,
in the uplink, whether the synchronous HARQ or the asynchronous
HARQ is applied is determined by the type of a search space where
the uplink grant has been received. In FIG. 12, regardless of the
RRC layer information, the synchronous HARQ is always applied to
the MAC layer data corresponding to the uplink grant received in a
common search space. In FIG. 12, based on the RRC layer
information, the synchronous HARQ or the asynchronous HARQ is
applied to the MAC layer data corresponding to the uplink grant
received in a UE-specific search space.
[0128] The UE-specific search space is at least determined by the
C-RNTI value set by the terminal device 1. That is, the respective
UE-specific search spaces are individually determined for each
terminal device 1. In other words, the common search space is a
search space common to the multiple terminal devices 1. The
terminal devices 1 supporting asynchronous HARQ and the terminal
devices 1 not supporting asynchronous HARQ share the common search
space. In addition, the common search space broadcasts the common
PDCCH to the terminal devices 1 supporting the asynchronous HARQ
and the terminal devices 1 not supporting the asynchronous HARQ.
Consequently, the DCI format 0 transmitted in the common search
space is preferably the same payload size as before. Thus, the DCI
format 0 transmitted in the common search space does not include
information for indicating a HARQ process number. Only the DCI
format 0 transmitted in the UE-specific search space includes the
information for indicating a HARQ process number. The synchronous
HARQ is always applied to the MAC layer data corresponding to the
uplink grant received in the common search space, whereby addition
of the information for indicating a HARQ process number to the DCI
format 0 transmitted in the common search space becomes
unnecessary, and the payload size of the DCI format 0 transmitted
in the common search space is the same as before.
[0129] FIG. 13 is a diagram illustrating a fourth example of a
measure for switching between the synchronous HARQ and the
asynchronous HARQ according to the present embodiment. In FIG. 13,
whether the synchronous HARQ or asynchronous HARQ is applied in the
uplink is determined by the type of the random access procedure. In
FIG. 13, regardless of the RRC layer information, the synchronous
HARQ is always applied to the MAC layer data corresponding to the
uplink grant included in a random access response associated with a
contention based random access procedure. In FIG. 13, based on the
RRC layer information, the synchronous HARQ or the asynchronous
HARQ is applied to the MAC layer data corresponding to the uplink
grant included in the random access response associated with a
non-contention based random access procedure.
[0130] In FIG. 11 to FIG. 13, the asynchronous HARQ may be applied
to the primary cell. In the above case, the synchronous HARQ may be
applied to transmission of a random access message 3 in the primary
cell. Further, the synchronous HARQ may be applied to the MAC layer
data corresponding to the uplink grant received in the common
search space in the primary cell.
[0131] Although the first to fourth examples of the measure for
switching between the synchronous HARQ and the asynchronous HARQ
have been described with reference to FIG. 10 to FIG. 13, the
specific configuration is not limited to the first to fourth
examples, and includes, for example, an amendment to a design that
falls within the scope that does not depart from the gist of the
present invention. Furthermore, embodiments obtained by suitably
combining technical means disclosed according to the first to
fourth examples of the present embodiment are also included in the
technical scope of the present invention.
[0132] The random access procedures will be described below.
[0133] The random access procedure may be executed on the primary
cell and secondary cell according to the present embodiment.
However, only one random access procedure is executed in any point
of the time domain. That is, multiple random access procedures are
not executed simultaneously.
[0134] In the primary cell, both the contention based random access
procedure and the non-contention based random access procedure may
be executed according to the present embodiment. In the secondary
cell, the non-contention based random access procedure may be
executed according to the present embodiment. In the secondary
cell, the contention based random access procedure is not executed
according to the present embodiment.
[0135] The random access preamble may be transmitted on the PRACH
in the primary cell. The terminal device 1 receives information
(RRC message) related to the random access procedure in the primary
cell from the base station device 3. The information related to the
random access procedure in the primary cell includes information
indicating a setting of PRACH resources in the primary cell.
[0136] The random access preamble may be transmitted on the PRACH
in the secondary cell. The terminal device 1 receives the
information (RRC message) related to the random access procedure in
the secondary cell from the base station device 3. The information
related to the random access procedure in the secondary cell
includes information indicating a setting of the PRACH resources in
the secondary cell.
[0137] In the contention based random access procedure, the
terminal device 1 itself selects a random access preamble index. In
the non-contention based random access procedure, the random access
preamble index is selected based on the information received from
the base station device 3 by the terminal device 1. When all the
bit values in the information received from the base station device
3 are 0, the terminal device 1 executes the contention based random
access procedure, and the terminal device 1 itself selects the
random access preamble index.
[0138] The random access response to the primary cell or the
secondary cell is transmitted on the PDSCH in the primary cell. The
random access response includes an uplink grant field mapped on the
uplink grant and a temporary C-RNTI field mapped on the information
for indicating the temporary C-RNTI. The uplink grant included in
the random access response is also referred to as a random access
response grant.
[0139] In a case that the received random access response includes
a random access preamble identifier corresponding to the
transmitted random access preamble and the terminal device 1
selects a random access preamble based on the information received
from the base station device 3, the terminal device 1 considers
that the non-contention based random access procedure has
successfully been completed, and transmits the PUSCH based on the
uplink grant included in the random access response.
[0140] In a case that the received random access response includes
a random access preamble identifier corresponding to the
transmitted random access preamble and the terminal device 1 itself
selects the random access preamble, the terminal device 1 sets the
temporary C-RNTI to the temporary C-RNTI field value included in
the received random access response, and transmits the random
access message 3 on the PUSCH based on the uplink grant included in
the random access response.
[0141] The PUSCH corresponding to the uplink grant included in the
random access response is transmitted at the serving cell in which
the corresponding preamble has been transmitted on the PRACH.
[0142] When the temporary C-RNTI is not set, the PUSCH
corresponding to the uplink grant included in the random access
response and the PUSCH retransmission in the same transport block
are scrambled based on the C-RNTI.
[0143] When the temporary C-RNTI is set, the PUSCH corresponding to
the uplink grant included in the random access response and the
PUSCH retransmission in the same transport block are scrambled
based on the temporary C-RNTI.
[0144] When the temporary C-RNTI is set, the PUSCH retransmission
of the transport block transmitted on the PUSCH corresponding to
the uplink grant included in the random access response is
scheduled by the DCI format 0 to which the CRC parity bit scrambled
by the temporary C-RNTI is added. The DCI format 0 is transmitted
on the PDCCH in the common search space.
[0145] FIG. 14 is a diagram illustrating an example of the random
access response according to the present embodiment.
[0146] In the downlink, one MAC PDU can include multiple random
access responses. In FIG. 14, the random access response (MAC RAR)
indicates the random access response. The MAC PDU in FIG. 14
includes one MAC header, n random access responses, and a padding.
In FIG. 14, one MAC header includes n E/T/RAPID subheaders
(E/T/RAPID fields).
[0147] The E/T/RAPID subheader includes an extension field (E
field), a type field (T field), and a random access preamble
identifier field (RAPID field). The E field is a flag indicating
whether or not more fields exist in the MAC header. The E field is
set to "1" to indicate that at least another E/T/RAPID field
follows. The E field is set to "0" to indicate that the MAC RAR or
the padding starts from the next byte.
[0148] The T field is a flag to indicate that the MAC subheader
includes any of RAPID fields and backoff indicator fields. The T
field is set to "1" to indicate presence of the RAPID field in the
MAC subheader.
[0149] The RAPID field identifies the transmitted random access
preamble. The terminal device 1, when the random access preamble
having been transmitted by the terminal device 1 corresponds to the
RAPID field, considers the random access response reception to be
successful, and processes the corresponding MAC RAR.
[0150] The MAC RAR includes an R field, a timing advance command
field, an uplink grant field, and a temporary C-RNTI field. The R
field is a reserved bit set to 0. The timing advance command field
indicates an index value TA used to control the amount of timing
adjustment for the PUSCH/SRS transmission.
[0151] The uplink grant field indicates PUSCH resources used in the
uplink. The uplink grant is mapped to the uplink grant field. The
temporary C-RNTI field indicates the temporary C-RNTI used by the
terminal device 1 during the contention based random access
procedure.
[0152] Since the random access response (MAC RAR) does not include
information indicating the HARQ process number, there is a problem
that the HARQ process number corresponding to the uplink grant
included in the random access response associated with the
non-contention based random access procedure cannot be
identified.
[0153] Then, the information indicating the HARQ process number, to
which the uplink grant included in the random access response
corresponds, may be mapped to the temporary C-RNTI field included
in the same random access response associated with the
non-contention based random access procedure in the serving cell to
which asynchronous HARQ is applied. In other words, the temporary
C-RNTI field, included in the random access response associated
with the non-contention based random access procedure in the
serving cell to which the asynchronous HARQ is applied, may be
reused to identify the HARQ process number to which the uplink
grant included in the same random access response corresponds.
[0154] The random access response associated with the
non-contention based random access procedure in the serving cell to
which the asynchronous HARQ is applied may include a HARQ
information field instead of the temporary C-RNTI field. Further,
the MAC RAR may include an F field, which is a flag indicating
either the temporary C-RNTI field or the HARQ information field
being included. The MAC RAR including the F field is referred to as
an extended MAC RAR according to the present embodiment.
[0155] The HARQ information field included in the MAC RAR is at
least mapped to the information indicating the HARQ process number.
In other words, the HARQ information field included in the MAC RAR
is at least used to indicate the HARQ process number. Further, the
HARQ information field included in the MAC RAR may be used to
indicate a modulation scheme and a coding scheme. Further, the HARQ
information field included in the MAC RAR may be used to indicate a
redundancy version.
[0156] FIG. 15 is a diagram illustrating an example of the extended
MAC RAR according to the present embodiment. (a) in FIG. 15 is a
diagram illustrating an example of the extended MAC RAR when the F
field is set to "0". When the extended MAC RAR includes the
temporary C-RNTI field, the F field included in the extended MAC
RAR is set to "0". (b) in FIG. 15 is a diagram illustrating an
example of the extended MAC RAR when the F field is set to "1".
When the extended MAC RAR includes the HARQ information field, the
F field included in the extended MAC RAR is set to "1".
[0157] With reference to the F field, the terminal device 1 can
identify the fields included in the extended MAC RAR. When the F
field is set to "0", the known terminal devices can recognize the
extended MAC RAR as the known MAC RAR. Consequently, when the known
MAC RAR and the extended MAC RAR are multiplexed in one MAC PDU,
the known terminal device is not affected.
[0158] Further, the HARQ process number to which the uplink grant
included in the random access response associated with the
non-contention based random access procedure in the serving cell to
which the asynchronous HARQ is applied corresponds, may be a
specific value. For example, the specific value may be indicated by
the information in the RRC layer. For example, the specific value
may be based on whether the serving cell supports FDD or TDD. For
example, the specific value may be based on the UL-DL
configuration. For example, the specific value may be predetermined
in the specification or the like.
[0159] Further, the terminal device 1 may consider the uplink
grant, included in the random access response associated with the
non-contention based random access procedure in the serving cell to
which asynchronous HARQ is applied, as invalid. In other words, the
terminal device 1 may disregard/abandon the uplink grant included
in the random access response associated with the non-contention
based random access procedure in the serving cell to which the
asynchronous HARQ is applied.
[0160] The reconfiguration/modification of the HARQ functionality
will be described below.
[0161] As described above, whether the synchronous HARQ or
asynchronous HARQ is applied to the secondary cell is controlled by
the RRC layer. The terminal device 1 can perform
reconfiguration/modification on the HARQ functionality in a certain
secondary cell. For example, the terminal device 1, after
configuring the asynchronous HARQ to a certain secondary cell based
on the RRC layer information, can reconfigure the synchronous HARQ
to the certain secondary cell based on another RRC layer
information. For example, the terminal device 1, after configuring
the synchronous HARQ to a certain secondary cell based on the RRC
layer information, can reconfigure the asynchronous HARQ to the
certain secondary cell based on another RRC layer information. For
instance, the terminal device 1, after configuring the asynchronous
HARQ to a certain secondary cell based on the RRC layer information
indicating the asynchronous HARQ enabling, can release the
information of the RRC layer and reconfigure the synchronous HARQ
to the certain secondary cell. With the above configuration, the
HARQ functionality can be flexibly controlled. Here, the
information in the RRC layer indicates the synchronous HARQ or the
asynchronous HARQ. Further, the information in the RRC layer may be
information indicating the asynchronous HARQ enabling.
[0162] The terminal device 1 transmits an RRC completion message to
the base station device 3 after reconfiguring/modifying the HARQ
functionality. The base station device 3 can recognize whether the
synchronous HARQ or the asynchronous HARQ is configured as the HARQ
functionality in the terminal device 1 based on the received RRC
completion message.
[0163] However, the maximum number of the HARQ processes
simultaneously managed by the HARQ entity corresponding to the
secondary cell may differ based on whether the synchronous HARQ or
the asynchronous HARQ is applied to the secondary cell. With the
above configuration, when information of the RRC layer related to
the HARQ functionality corresponding to a certain secondary cell is
modified (reconfigured or released), the base station device 3 may
not be able to recognize the ongoing HARQ process by the terminal
device 1.
[0164] Therefore, the terminal device 1, when information of the
RRC layer corresponding to a certain serving cell is modified
(reconfigured or released), may flash multiple HARQ buffers
corresponding to the serving cell, of the multiple HARQ buffers
which the terminal device 1 includes, except for the buffer related
to the random access message 3. Further, the terminal device 1,
when information of the RRC layer corresponding to a certain
serving cell is modified (reconfigured or released), may set the
value of the NDI with respect to the HARQ process corresponding to
the stated serving cell to 0, except for the NDI related to the
random access message 3. Further, the terminal device 1 and the
base station device 3, when the information of the RRC layer
corresponding to a certain serving cell is modified (reconfigured
or released), may consider the next transmission related to the
HARQ process corresponding to the stated serving cell as initial
transmission, except for the transmission related to the random
access message 3. Moreover, the terminal device 1 and the base
station device 3, when the information of the RRC layer
corresponding to a certain serving cell is modified (reconfigured
or released), may initialize the HARQ entity corresponding to the
stated serving cell.
[0165] Then, the terminal device 1, when the information of the RRC
layer corresponding to a certain secondary cell is modified
(reconfigured or released), may flash multiple HARQ buffers
corresponding to the stated secondary cell, of the multiple HARQ
buffers which the terminal device 1 includes. Further, the terminal
device 1, when the information of the RRC layer corresponding to a
certain secondary cell is modified (reconfigured or released), may
set the value of the NDI with respect to the HARQ process
corresponding to the stated secondary cell to 0. Further, the
terminal device 1 and the base station device 3, when the
information of the RRC layer corresponding to a certain secondary
cell is modified (reconfigured or released), may consider the next
transmission related to the HARQ process corresponding to the
stated secondary cell as initial transmission. Moreover, the
terminal device 1 and the base station device 3, when the
information of the RRC layer corresponding to a secondary serving
cell is modified (reconfigured or released), may initialize the
HARQ entity corresponding to the stated secondary cell.
[0166] With the above configuration, when the base station device 3
transmits the information of the RRC layer which indicates
reconfiguration/modification of the HARQ functionality to the
terminal device 1, the base station device 3 can properly control
the HARQ process after reconfiguring/modifying the HARQ
functionality.
[0167] Configurations of devices according to the present
embodiment will be described below.
[0168] FIG. 16 is a schematic block diagram illustrating a
configuration of the terminal device 1 according to the present
embodiment. As illustrated, the terminal device 1 is configured to
include a radio transmission/reception unit 10 and a higher layer
processing unit 14. The radio transmission/reception unit 10 is
configured to include an antenna unit 11, a radio frequency (RF)
unit 12, and a baseband unit 13. The higher layer processing unit
14 is configured to include a MAC layer processing unit 15 and a
radio resource control layer processing unit 16. The radio
transmission/reception unit 10 is also referred to as a
transmission unit, a reception unit, or a physical layer processing
unit.
[0169] The higher layer processing unit 14 outputs uplink data
(transport block) generated by a user operation or the like, to the
radio transmission/reception unit 10. The higher layer processing
unit 14 performs processing of 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.
[0170] The MAC layer processing unit 15 in the higher layer
processing unit 14 processes the MAC layer. The MAC layer
processing unit 15 controls a HARQ based on various configuration
information/parameters managed by the radio resource control layer
processing unit 16. The MAC layer processing unit 15 manages
multiple HARQ entities, multiple HARQ processes, and multiple HARQ
buffers.
[0171] The radio resource control layer processing unit 16 in the
higher layer processing unit 14 processes the radio resource
control layer. The radio resource control layer processing unit 16
manages the various configuration information/parameters thereof.
The radio resource control layer processing unit 16 sets the
various configuration information/parameters based on the RRC layer
signal received from the base station device 3. In other words, the
radio resource control layer processing unit 16 sets the various
configuration information/parameters based on the information
indicating the various configuration information/parameters
received from the base station device 3.
[0172] The radio transmission/reception unit 10 performs processing
of the physical layer, such as modulation, demodulation, coding,
and decoding. The radio transmission/reception unit 10
demultiplexes, demodulates, and decodes a signal received from the
base station device 3, and outputs the information resulting from
the decoding to the higher layer processing unit 14. The radio
transmission/reception unit 10 modulates and codes data to generate
a transmit signal, and transmits the transmit signal to the base
station device 3.
[0173] The RF unit 12 converts (down-converts) a signal received
through the antenna unit 11 into a baseband signal by orthogonal
demodulation and removes unnecessary frequency components. The RF
unit 12 outputs the processed analog signal to the baseband
unit.
[0174] The baseband unit 13 converts the analog signal input from
the RF unit 12 into a digital signal. The baseband unit 13 removes
a portion corresponding to a cyclic prefix (CP) from the digital
signal resulting from the conversion, performs fast Fourier
transform (FFT) on the signal from which the CP has been removed,
and extracts a signal in the frequency domain.
[0175] The baseband unit 13 performs inverse fast Fourier transform
(IFFT) on data to generate an SC-FDMA symbol, attaches a CP to the
generated SC-FDMA symbol, generates a digital signal in a baseband,
and converts the digital signal in the baseband into an analog
signal. The baseband unit 13 outputs the analog signal resulting
from the conversion, to the RF unit 12.
[0176] The RF unit 12 removes unnecessary frequency components from
the analog signal input from the baseband unit 13 using a low-pass
filter, up-converts the analog signal into a signal of a carrier
frequency, and transmits the final result via the antenna unit 11.
The RF unit 12 amplifies the power. Further, the RF unit 12 may
include functionality for controlling the transmission power. The
RF unit 12 is also referred to as a transmission power control
unit.
[0177] FIG. 17 is a schematic block diagram illustrating a
configuration of the base station device 3 according to the present
embodiment. As illustrated, the base station device 3 is configured
to include a radio transmission/reception unit 30 and a higher
layer processing unit 34. The radio transmission/reception unit 30
is configured to include an antenna unit 31, an RF unit 32, and a
baseband unit 33. The higher layer processing unit 34 is configured
to include a MAC layer processing unit 35 and a radio resource
control layer processing unit 36. The radio transmission/reception
unit 30 is also referred to as a transmission unit, a reception
unit, or a physical layer processing unit.
[0178] The higher layer processing unit 34 performs processing of
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.
[0179] The MAC layer processing unit 35 in the higher layer
processing unit 34 processes the MAC layer. The MAC layer
processing unit 15 controls a HARQ based on various configuration
information/parameters managed by the radio resource control layer
processing unit 16. The MAC layer processing unit 15 generates
ACK/NACK and HARQ information corresponding to the uplink data
(UL-SCH). The ACK/NACK and HARQ information corresponding to the
uplink data (UL-SCH) are transmitted on the PHICH or PDCCH to the
terminal device 1.
[0180] The radio resource control layer processing unit 36 in the
higher layer processing unit 34 processes the radio resource
control layer. The radio resource control layer processing unit 36
generates or acquires from a higher node, such as downlink data
(transport block) arranged on a physical downlink shared channel,
system information, an RRC message, a MAC control element (CE), and
outputs the generated or acquired data to the radio
transmission/reception unit 30. Furthermore, the radio resource
control layer processing unit 36 manages various configuration
information/parameters for each of the terminal devices 1. The
radio resource control layer processing unit 36 may set the various
configuration information/parameters for each of the terminal
devices 1 via a higher layer signal. In other words, the radio
resource control layer processing unit 36 transmits/broadcasts
information indicating the various configuration
information/parameters.
[0181] The capability of the radio transmission/reception unit 30
is similar to that of the radio transmission/reception unit 10, and
hence description thereof is omitted.
[0182] Hereinafter, various aspects of the terminal device and the
base station device will be described according to the present
embodiment.
[0183] (1) The terminal device according to the present embodiment
is a terminal device configured to communicate, in multiple serving
cells including one primary cell and one secondary cell, with the
base station device. The terminal device includes: a reception unit
to receive information from an RRC layer indicating asynchronous
HARQ; a MAC layer processing unit to manage a first HARQ process
corresponding to the primary cell and a second HARQ process
corresponding to the secondary cell; and a transmission unit to
transmit MAC layer data in response to the indication from the
first HARQ process and the second HARQ process. The MAC layer
processing unit, regardless of whether or not the RRC layer
information indicating the asynchronous HARQ is configured,
instructs the first uplink HARQ process to always execute
synchronous HARQ; and, based on whether or not the RRC layer
information indicating the asynchronous HARQ is configured,
instructs the second uplink HARQ process to execute the synchronous
HARQ or the asynchronous HARQ.
[0184] (2) The base station device according to the present
embodiment is a base station device configured to communicate, in
multiple serving cells including one primary cell and one secondary
cell, with the terminal device. The base station device includes a
transmission unit to transmit the RRC layer information indicating
asynchronous HARQ, a MAC layer processing unit to manage a first
HARQ process corresponding to the primary cell and a second HARQ
process corresponding to the secondary cell, and a reception unit
to receive the MAC layer data in response to the indication from
the first HARQ process and the second HARQ process. The MAC layer
processing unit, regardless of whether or not the RRC layer
information indicating the asynchronous HARQ is configured in the
terminal device, instructs the first uplink HARQ process to always
execute synchronous HARQ; and, based on whether or not the RRC
layer information indicating the asynchronous HARQ is configured in
the terminal device, instructs the second uplink HARQ process to
execute the synchronous HARQ or the asynchronous HARQ.
[0185] (3) In the present embodiment, the primary cell is the cell
in which the terminal device executes the initial connection
establishment procedure, the cell in which the terminal device
starts the connection re-establishment procedure, or the cell which
is indicated as the primary cell in the handover procedure.
[0186] (4) The terminal device according to the present embodiment
includes a reception unit to receive the RRC layer information
indicating the asynchronous HARQ and the uplink grant, and a
transmission unit to transmit the MAC layer data in response to the
uplink grant in the secondary cell. Regardless of whether or not
the RRC layer information indicating the asynchronous HARQ is
configured, the synchronous HARQ is always applied to the MAC layer
data corresponding to the uplink grant received on the physical
downlink control channel including a CRC parity bit scrambled by
the temporary C-RNTI. Whether the synchronous HARQ or the
asynchronous HARQ is applied to the MAC layer data corresponding to
the uplink grant received on the physical downlink control channel
including a CRC parity bit scrambled by the C-RNTI is determined
based on whether or not the RRC layer information indicating the
asynchronous HARQ is configured.
[0187] (5) The base station device according to the present
embodiment includes a transmission unit to transmit the RRC layer
information indicating asynchronous HARQ and the uplink grant, and
a reception unit to receive the MAC layer data in response to the
uplink grant in the secondary cell. Regardless of whether or not
the RRC layer information indicating the asynchronous HARQ is
configured in the terminal device, the synchronous HARQ is always
applied to the MAC layer data corresponding to the uplink grant
transmitted on the physical downlink control channel including a
CRC parity bit scrambled by the temporary C-RNTI. Whether the
synchronous HARQ or the asynchronous HARQ is applied to the MAC
layer data corresponding to the uplink grant transmitted on the
physical downlink control channel including a CRC parity bit
scrambled by the C-RNTI in the terminal device is determined based
on whether or not the RRC layer information indicating the
asynchronous HARQ is configured in the terminal device.
[0188] (6) In the terminal device according to the present
embodiment, regardless of whether or not the RRC layer information
indicating the asynchronous HARQ is configured, the synchronous
HARQ is always applied to the MAC layer data corresponding to the
uplink grant included in the random access response related to the
contention based random access procedure.
[0189] (7) In the present embodiment, whether the synchronous HARQ
or the asynchronous HARQ is applied to the MAC layer data
corresponding to the uplink grant included in the random access
response related to the non-contention based random access
procedure is determined based on whether or not the RRC layer
information indicating the asynchronous HARQ is configured in the
terminal device.
[0190] (8) In the terminal device according to the present
embodiment, regardless of whether or not the RRC layer information
indicating the asynchronous HARQ is configured in the terminal
device, the synchronous HARQ is always applied to the MAC layer
data corresponding to the uplink grant having been received on a
physical downlink control channel including a CRC parity bit
scrambled by the SPS C-RNTI.
[0191] (9) The terminal device according to the present embodiment
includes a reception unit to receive the RRC layer information
indicating the asynchronous HARQ, and a transmission unit to
transmit the MAC layer data in response to the uplink grant
received on the physical downlink control channel including a CRC
parity bit scrambled by the C-RNTI. Regardless of whether or not
the RRC layer information indicating the asynchronous HARQ is
configured, the synchronous HARQ is always applied to the MAC layer
data transmission corresponding to the uplink grant having been
received on the physical downlink control channel in a first search
space. Whether the synchronous HARQ or the asynchronous HARQ is
applied to the MAC layer data transmission corresponding to the
uplink grant having been received on the physical downlink control
channel in a second search space is determined based on whether or
not the RRC layer information indicating the asynchronous HARQ is
configured.
[0192] (10) The base station device according to the present
embodiment includes a transmission unit to transmit the RRC layer
information indicating asynchronous HARQ, and a reception unit to
receive the MAC layer data in response to the uplink grant
transmitted on the physical downlink control channel including a
CRC parity bit scrambled by the C-RNTI. Regardless of whether or
not the RRC layer information indicating the asynchronous HARQ is
configured in the terminal device, the synchronous HARQ is always
applied to the MAC layer data transmission corresponding to the
uplink grant transmitted on the physical downlink control channel
in a first search space. Whether the synchronous HARQ or the
asynchronous HARQ is applied to the MAC layer data reception
corresponding to the uplink grant transmitted on the physical
downlink control channel in a second search space, is determined
based on whether or not the RRC layer information indicating the
asynchronous HARQ is configured in the terminal device.
[0193] (11) In the present embodiment, the first search space is a
common search space (CSS), and the second search space is a
UE-specific search space (USS) given by the C-RNTI.
[0194] (12) The terminal device according to the present embodiment
includes a reception unit to receive the RRC layer information
indicating the asynchronous HARQ for a secondary cell, and a first
random access response which is a random access response including
a field for indicating the uplink grant and temporary C-RNTI and is
related to the non-contention based random access procedure in the
secondary cell; a transmission unit to transmit the MAC layer data;
and a MAC layer processing unit configured to manage multiple HARQ
processes and deliver the uplink grant to the HARQ process which
instructs the transmission unit to transmit the MAC layer data in
response to the uplink grant. When the RRC layer information
indicating the asynchronous HARQ is configured, the HARQ process to
which the uplink grant included in the first random access response
is delivered is determined by the value of the field for indicating
the temporary C-RNTI included in the first random access
response.
[0195] (13) In the terminal device according to the present
embodiment, when the RRC layer information indicating the
asynchronous HARQ is not configured, the HARQ process to which the
uplink grant included in the first random access response is
delivered is determined by the subframe having received the first
random access response.
[0196] (14) In the terminal device according to the present
embodiment, the reception unit receives a second random access
response related to the contention based random access procedure in
the secondary cell; regardless of whether or not the RRC layer
information indicating the asynchronous HARQ is configured, the
HARQ process to which the uplink grant included in the second
random access response is delivered is determined by the subframe
having received the second random access response.
[0197] (15) The base station device according to the present
embodiment includes: a transmission unit to transmit the RRC layer
information indicating the asynchronous HARQ for a secondary cell,
and a first random access response which is a random access
response including a field for indicating the uplink grant and
temporary C-RNTI and is related to the non-contention based random
access procedure in the secondary cell; a reception unit to receive
the MAC layer data; and a MAC layer processing unit to manage
multiple HARQ processes. When the RRC layer information indicating
the asynchronous HARQ is configured in the terminal device, the
value of the field for indicating the temporary C-RNTI included in
the first random access response indicates the HARQ process
corresponding to the uplink grant included in the first random
access response.
[0198] (16) In the base station device according to the present
embodiment, when the RRC layer information indicating the
asynchronous HARQ is not configured in the terminal device, the
HARQ process corresponding to the uplink grant included in the
first random access response is associated with the subframe having
transmitted the first random access response.
[0199] (17) In the base station device according to the present
embodiment, the transmission unit transmits a second random access
response related to the contention based random access procedure in
the secondary cell; regardless of whether or not the RRC layer
information indicating the asynchronous HARQ is configured, the
HARQ process corresponding to the uplink grant included in the
second random access response is associated with the subframe
having transmitted the second random access response.
[0200] (18) The terminal device according to the present embodiment
includes a reception unit to receive the RRC layer information
indicating the asynchronous HARQ, a transmission unit to transmit
the MAC layer data, and a MAC layer processing unit to deliver the
uplink grant to the HARQ process instructing the transmission unit
to transmit the MAC layer data in response to the uplink grant.
Regardless of whether or not the RRC layer information indicating
the asynchronous HARQ is configured, the HARQ process to which the
uplink grant having been received on the physical downlink control
channel including a CRC parity bit scrambled by the temporary
C-RNTI is delivered is determined by the subframe having received
the uplink grant on the physical downlink control channel including
a CRC parity bit scrambled by the temporary C-RNTI. The HARQ
process to which the uplink grant received on the physical downlink
control channel including a CRC parity bit scrambled by the C-RNTI
is delivered, is determined by either the HARQ information having
been received on the physical downlink control channel including a
CRC parity bit scrambled by the C-RNTI or the subframe having
received the uplink grant on the physical downlink control channel
including a CRC parity bit scrambled by the C-RNTI based on whether
or not the RRC layer information indicating the asynchronous HARQ
is configured.
[0201] (19) In the terminal device according to the present
embodiment, regardless of whether or not the RRC layer information
indicating the asynchronous HARQ is configured, the HARQ process to
which the uplink grant included in the random access response
related to the contention based random access procedure is
delivered, is determined by a subframe number of the subframe
having received the random access response.
[0202] (20) In the terminal device according to the present
embodiment, the HARQ process to which the uplink grant included in
the random access response related to the non-contention based
random access procedure is delivered is determined, based on
whether or not the RRC layer information indicating the
asynchronous HARQ is configured, by either the information included
in the random access response or the subframe having received the
uplink grant on the physical downlink control channel including a
CRC parity bit scrambled by the C-RNTI.
[0203] (21) In the terminal device according to the present
embodiment, regardless of whether or not the RRC layer information
indicating the asynchronous HARQ is configured, the HARQ process to
which the uplink grant having been received on the physical
downlink control channel including a CRC parity bit scrambled by
the SPS C-RNTI is delivered is determined by the subframe having
received the uplink grant on the physical downlink control channel
including a CRC parity bit scrambled by the SPS C-RNTI.
[0204] (22) The base station device according to the present
embodiment includes a transmission unit to transmit the RRC layer
information indicating the asynchronous HARQ and the uplink grant,
a reception unit to receive the MAC layer data, and a MAC layer
processing unit to deliver the uplink grant to the HARQ process
instructing the transmission unit to transmit the MAC layer data in
response to the uplink grant. Regardless of whether or not the RRC
layer information indicating the asynchronous HARQ is configured in
the terminal device, the HARQ process corresponding to the uplink
grant transmitted on the physical downlink control channel
including a CRC parity bit scrambled by the temporary C-RNTI is
associated with the subframe transmitting the uplink grant on the
physical downlink control channel including a CRC parity bit
scrambled by the temporary C-RNTI; and whether the HARQ process to
which the uplink grant transmitted on the physical downlink control
channel including a CRC parity bit scrambled by the C-RNTI is
delivered is indicated by the HARQ information transmitted on the
physical downlink control channel including a CRC parity bit
scrambled by the C-RNTI or is associated with the subframe having
transmitted the uplink grant on the physical downlink control
channel including a CRC parity bit scrambled by the C-RNTI, is
determined based on whether or not the RRC layer information
indicating the asynchronous HARQ is configured in the terminal
device.
[0205] (23) In the base station device according to the present
embodiment, regardless of whether or not the RRC layer information
indicating the asynchronous HARQ is configured in the terminal
device, the HARQ process corresponding to the uplink grant included
in the random access response related to the contention based
random access procedure, is associated with the subframe having
transmitted the random access response.
[0206] (24) In the base station device according to the present
embodiment, whether the HARQ process corresponding to the uplink
grant included in the random access response related to the
non-contention based random access procedure is indicated by the
information included in the random access response or is associated
with the subframe having transmitted the uplink grant on the
physical downlink control channel including a CRC parity bit
scrambled by the C-RNTI, is determined based on whether or not the
RRC layer information indicating the asynchronous HARQ is
configured.
[0207] (25) In the base station device according to the present
embodiment, regardless of whether or not the RRC layer information
indicating the asynchronous HARQ is configured in the terminal
device, the HARQ process corresponding to the uplink grant having
been transmitted on the physical downlink control channel including
a CRC parity bit scrambled by the SPS C-RNTI is associated with the
subframe having transmitted the uplink grant on the physical
downlink control channel including a CRC parity bit scrambled by
the SPS C-RNTI.
[0208] (26) The terminal device according to the present embodiment
includes a reception unit to receive the uplink grant on the
physical downlink control channel including a CRC parity bit
scrambled by the C-RNTI, a transmission unit to transmit the MAC
layer data, and a MAC layer processing unit delivering the uplink
grant to the HARQ process which instructs the transmission unit to
transmit the MAC layer data in response to the uplink grant.
Regardless of whether or not the RRC layer information indicating
the asynchronous HARQ is configured, the HARQ process to which the
uplink grant received on the physical downlink control channel in a
first search space is delivered is determined by the subframe
having received the uplink grant on the physical downlink control
channel in the first search space; and the HARQ process to which
the uplink grant received on the physical downlink control channel
in a second search space is delivered is determined, based on
whether or not the RRC layer information indicating the
asynchronous HARQ is configured, by either the HARQ information
received on the physical downlink control channel in the second
search space or the subframe having received the uplink grant on
the physical downlink control channel in the second search
space.
[0209] (27) The base station device according to the present
embodiment includes a transmission unit to transmit the uplink
grant on the physical downlink control channel including a CRC
parity bit scramble by the C-RNTI, a reception unit to receive the
MAC layer data, and a MAC layer processing unit to manage multiple
HARQ processes. Regardless of whether or not the RRC layer
information indicating the asynchronous HARQ is configured in the
terminal device, the HARQ process corresponding to the uplink grant
transmitted on the physical downlink control channel in a first
search space is associated with the subframe having transmitted the
uplink grant on the physical downlink control channel in the first
search space; and whether the HARQ process corresponding to the
uplink grant transmitted on the physical downlink control channel
in a second search space is indicated by the HARQ information
transmitted on the physical downlink control channel in the second
search space or is associated with the subframe having transmitted
the uplink grant on the physical downlink control channel in the
second search space, is determined based on whether or not the RRC
layer information indicating the asynchronous HARQ is configured in
the terminal device.
[0210] (28) The terminal device according to the present embodiment
includes a reception unit to receive an RRC layer parameter
indicating the synchronous HARQ or asynchronous HARQ to a secondary
cell, a MAC layer processing unit to apply the synchronous HARQ or
asynchronous HARQ to MAC layer data transmission in the secondary
cell based on the RRC layer parameter, and multiple HARQ buffers to
store the MAC layer data. The HARQ control unit, when the RRC layer
parameter is modified/reconfigured/released, flashes a HARQ buffer
corresponding to the secondary cell, of the multiple HARQ
buffers.
[0211] (29) The terminal device according to the present embodiment
includes a reception unit to receive an RRC layer parameter
indicating the synchronous HARQ or the asynchronous HARQ to a
secondary cell, a MAC layer processing unit to apply the
synchronous HARQ or asynchronous HARQ to MAC layer data
transmission in the secondary cell based on the RRC layer
parameter. The MAC layer processing unit manages a HARQ process
related to the MAC layer data transmitted in the secondary cell and
sets the NDI corresponding to the HARQ process to 0 when the RRC
layer parameter is modified/reconfigured.
[0212] (30) The terminal device according to the present embodiment
includes a reception unit to receive the RRC layer parameter
indicating the synchronous HARQ or the asynchronous HARQ to a
secondary cell, and a MAC layer processing unit to apply the
synchronous HARQ or asynchronous HARQ to MAC layer data
transmission in the secondary cell based on the RRC layer
parameter. The MAC layer processing unit manages the HARQ processes
related to the MAC layer data transmitted in the secondary cell,
and considers, when the RRC layer parameter is
modified/reconfigured, the next transmission related to the HARQ
process as initial transmission.
[0213] (31) The terminal device according to the present embodiment
includes a reception unit to receive the RRC layer parameter
indicating the synchronous HARQ or the asynchronous HARQ to a
secondary cell, and a MAC layer processing unit to apply the
synchronous HARQ or asynchronous HARQ to MAC layer data
transmission in the secondary cell based on the RRC layer
parameter. The MAC layer processing unit includes a HARQ entity
which manages multiple HARQ processes related to the MAC layer data
in the secondary cell, and, when the RRC layer parameter is
modified/reconfigured, initializes the HARQ entity.
[0214] With the above configurations, the terminal device 1 can
communicate with the base station device 3 efficiency.
[0215] A program running on each of the base station device 3 and
the terminal device 1 according to the present invention may be a
program that controls a central processing unit (CPU) and the like
(a program for causing a computer to operate) in such a manner as
to realize the functions according to the above-described
embodiment of the present invention. The information handled in
these devices is temporarily stored in a random access memory (RAM)
while being processed. Thereafter, the information is stored in
various types of read only memory (ROM) such as a flash ROM and a
hard disk drive (HDD) and when necessary, is read out by the CPU to
be modified or rewritten.
[0216] Moreover, the terminal device 1 and the base station device
3 according to the above-described embodiment may be partially
realized by a computer. This configuration may be realized by
recording a program for realizing such control functions on a
computer-readable recording medium and causing a computer system to
read the program recorded on the recording medium for
execution.
[0217] The "computer system" refers to a computer system built into
the terminal device 1 or the base station device 3, and the
computer system includes an OS and hardware components such as a
peripheral device. Furthermore, the "computer-readable recording
medium" refers to a portable medium such as a flexible disk, a
magneto-optical disk, a ROM, and a CD-ROM, and a storage device
such as a hard disk built into the computer system.
[0218] Moreover, the "computer-readable recording medium" may
include a medium that dynamically retains the program for a short
period of time, such as a communication line that is used to
transmit the program over a network such as the Internet or over a
communication circuit such as a telephone circuit, and a medium
that retains, in that case, the program for a fixed period of time,
such as a volatile memory within the computer system which
functions as a server or a client. Furthermore, the program may be
configured to realize some of the functions described above, and
also may be configured to be capable of realizing the functions
described above in combination with a program already recorded in
the computer system.
[0219] Furthermore, the base station device 3 according to the
above-described embodiment can be realized as an aggregation (a
device group) constituted of multiple devices. Devices constituting
the device group may be each equipped with some or all portions of
each function or each functional block of the base station device 3
according to the above-described embodiment. It is only required
that the device group itself include general functions or general
functional blocks of the base station device 3. Furthermore, the
terminal device 1 according to the above-described embodiment can
communicate with the base station device as the aggregation.
[0220] Furthermore, the base station device 3 according to the
above-described embodiment may be an evolved universal terrestrial
radio access network (EUTRAN). Furthermore, the base station device
3 according to the above-described embodiment may have some or all
portions of the function of a node higher than an eNodeB.
[0221] Furthermore, some or all portions of each of the terminal
device 1 and the base station device 3 according to the
above-described embodiment may be realized as an LSI that is a
typical integrated circuit or may be realized as a chip set. The
functional blocks of each of the terminal device 1 and the base
station device 3 may be individually realized as a chip, or some or
all of the functional blocks may be integrated into a chip.
Furthermore, the circuit integration technique is not limited to
the LSI, and the integrated circuit may be realized with a
dedicated circuit or a general-purpose processor. Furthermore, if
with advances in semiconductor technology, a circuit integration
technology with which an LSI is replaced appears, it is also
possible to use an integrated circuit based on the technology.
[0222] Furthermore, according to the above-described embodiment,
the terminal device is described as one example of a communication
device, but the present invention is not limited thereto, and can
be applied to a terminal device or a communication device of a
fixed-type or a stationary-type electronic apparatus installed
indoors or outdoors, for example, such as an audio-video (AV)
apparatus, a kitchen apparatus, a cleaning or washing machine, an
air-conditioning apparatus, office equipment, a vending machine,
and other household apparatuses.
[0223] The embodiment of the present invention has been described
in detail above referring to the drawings, but the specific
configuration is not limited to the above embodiment, and includes,
for example, an amendment to a design that falls within the scope
that does not depart from the gist of the present invention.
Furthermore, various modifications are possible within the scope of
the present invention defined by claims, and embodiments that are
made by suitably combining technical means disclosed according to
the different embodiments are also included in the technical scope
of the present invention. Furthermore, a configuration in which a
constituent element that achieves the same effect is substituted
for the one that is described according to the embodiment is also
included in the technical scope of the present invention.
DESCRIPTION OF REFERENCE NUMERALS
[0224] 1 (1A,1B,1C) Terminal device [0225] 3 Base station device
[0226] 10 Radio transmission/reception unit [0227] 11 Antenna unit
[0228] 12 RF unit [0229] 13 Baseband unit [0230] 14 Higher layer
processing unit [0231] 15 MAC layer processing unit [0232] 16 Radio
resource control layer processing unit [0233] 30 Radio
transmission/reception unit [0234] 31 Antenna unit [0235] 32 RF
unit [0236] 33 Baseband unit [0237] 34 Higher layer processing unit
[0238] 35 MAC layer processing unit [0239] 36 Radio resource
control layer processing unit
* * * * *