JP5416231B2 - Base station apparatus, radio communication method and circuit apparatus - Google Patents

Description

The present invention relates to a base station device, a wireless communication method, and a circuit device .

Conventionally, cellular mobile radio access and wireless network evolution (hereinafter referred to as “Long Term Evolution (LTE)” or “Evolved Universal Terrestrial Radio A
ccess (EUTRA) ". ) Is the third generation partnership project (3rd Generat
ion Partnership Project: 3GPP). In LTE, an Orthogonal Frequency Division Multiplexing (OFDM) system, which is multicarrier transmission, is used as a wireless communication (downlink) communication system from a base station apparatus to a mobile station apparatus. Further, as a communication method of radio communication (uplink) from a mobile station apparatus to a base station apparatus, SC-FDMA (Single-Carrier Frequency Division Mu) which is single carrier transmission.
ltiple Access) method is used.

In LTE, a base station apparatus is a PU that is a data transmission channel transmitted by a mobile station apparatus.
Radio resource allocation, coding rate, modulation scheme, etc. of SCH (Physical Uplink Shared Channel) and PDSCH (Physical Downlink Shared Channel) which is a channel for data transmission transmitted by the base station apparatus are determined. Further, the base station apparatus transmits downlink control information (Downlink Control Information: DCI) indicating the radio resource allocation and the like to the PDCCH.
It transmits to a mobile station apparatus using (Physical Downlink Control Channel). LTE
Then, the mobile station apparatus receives a reception response (Acknowledgement / Non-N) indicating the success or failure of PDSCH reception.
Acknowledgment: ACK / NACK) and channel quality information indicating the quality of the downlink channel (also referred to as channel quality information or channel state information)
Uplink Control Information (UCI) such as PUCCH (Physica
l Transmit to the base station apparatus using Uplink Control Channel). However, when the mobile station apparatus transmits uplink control information, if the radio resource of PUSCH is allocated from the base station apparatus, the mobile station apparatus transmits uplink control information using PUSCH instead of PUCCH.

In 3GPP, a radio access scheme and a radio network (hereinafter referred to as “Long Term Evolut”) that realize higher-speed data communication using a frequency band wider than LTE.
ion-Advanced (LTE-A) "or" Advanced Evolved Universal Terrestrial Radio A
ccess (A-EUTRA) ". ) Is being considered. In LTE-A, it has backward compatibility with LTE, that is, the base station apparatus of LTE-A
-It is required to perform radio communication simultaneously with both A and LTE mobile station devices, and to enable LTE-A mobile station devices to perform radio communication with both LTE-A and LTE base station devices. Therefore, it is considered that LTE-A uses the same channel structure as LTE.

In Non-Patent Document 1, in LTE-A, latency (latency) and overhead (o
contention based up transmission to improve verhead)
It is proposed to introduce link transmission). In contention-based uplink transmission, the base station apparatus transmits downlink control information that can be received by a plurality of mobile station apparatuses, including PUSCH radio resource allocation and the like. The mobile station apparatus detects the downlink control information and transmits PUSCH according to the downlink control information. In contention-based uplink transmission, a plurality of mobile station apparatuses may detect the same downlink control information. As a result, multiple mobile station devices can use PUSCH with the same radio resource.
And PUSCHs from a plurality of mobile station apparatuses compete (collision).

Note that contention-based uplink transmission using PUSCH is different from random access using a physical random access channel (PRACH). Both contention-based uplink transmission and random access are identical in that there is a possibility of contention (collision). The radio resource used for random access preamble transmission is PRACH indicated by system information broadcast by the base station apparatus, whereas the radio resource used for contention-based uplink transmission is PDCCH. It is different in that it is a PUSCH scheduled at.

In addition, PUSCH is used for transmission of message 3 in the random access process. After the preamble transmission via the PRACH, the mobile station apparatus uses the PUSC scheduled with the random access response (message 2) while leaving the possibility of collision.
Uplink data is transmitted using H radio resources. However, in contention-based uplink transmission, the base station apparatus schedules radio resources of PUSCH that may collide with PDCCH without performing preamble transmission via PRACH, and the mobile station apparatus transmits the scheduled PUSCH. Transmit uplink data using radio resources. That is, contention-based uplink transmission does not involve random access processing.

In LTE, access using a scheduling request (SR) is fundamental. A mobile station apparatus requests | requires the radio | wireless resource of PUSCH for transmitting uplink data using PUCCH or PRACH. On the other hand, since contention-based uplink transmission can directly transmit uplink data without the mobile station apparatus processing a scheduling request, latency is improved compared to an access method using a scheduling request. PUSCH is PRA
Unlike the CH, since it does not have a guard time, only a mobile station apparatus with effective uplink timing adjustment (Time Alignment) can access the base station apparatus by contention-based uplink transmission. . The period in which uplink timing adjustment is effective is a certain period (including infinity) after receiving uplink timing information (Timing Advance Command).

"Contention based uplink transmissions", 3GPP TSG RAN WG2 Meeting # 66bis, R2-093812, June 29- July 03, 2009.

However, since the base station apparatus cannot recognize which mobile station apparatus performs contention-based uplink transmission, the contention-based uplink transmission signal is a dedicated signal assigned to the mobile station apparatus by the base station apparatus. There is a problem in that it collides with other uplink signals transmitted by the other radio resource.

The present invention has been made in view of the above points, and an object of the present invention is to provide a mobile station apparatus and radio communication capable of efficiently transmitting a contention-based uplink transmission signal and another uplink signal. It is to provide a method and an integrated circuit.

(1) In order to achieve the above object, the present invention takes the following measures. That is, the base station apparatus of the present invention is a base station apparatus that communicates with a mobile station apparatus, a transmitter that transmits downlink data and information indicating radio resources for contention-based signal transmission, A receiving unit that receives ACK or NACK for downlink data and the contention-based signal, and the ACK or NACK and the contention-based signal collide in a single uplink time frame. In this case, the mobile station apparatus is configured to set whether to transmit the ACK or NACK and the contention-based signal at the same time or to transmit one of them.

(2) Preferably, the base station apparatus of the present invention is characterized in that the contention-based signal is received from the mobile station apparatus using a physical uplink shared channel .

(3) Preferably, the base station apparatus of the present invention receives the ACK or NACK from the mobile station apparatus using a physical uplink control channel .

(4) The radio communication method of the present invention is a radio communication method applied to a base station apparatus that communicates with a mobile station apparatus, and indicates downlink data and radio resources for contention-based signal transmission. Transmitting information, receiving an ACK or NACK for the downlink data and the contention-based signal, and in a single uplink time frame, the ACK or NACK and the contention-based signal. A step of setting whether the mobile station apparatus transmits the ACK or NACK and the contention-based signal at the same time or one of them when a signal collides with , Yes.

(5) The circuit device of the present invention is a circuit device in a base station device that communicates with a mobile station device, and transmits downlink data and information indicating radio resources for contention-based signal transmission. And a receiving circuit for receiving the ACK or NACK for the downlink data and the contention-based signal, and the ACK or NACK and the contention base in a single uplink time frame. The mobile station apparatus sets whether to transmit the ACK or NACK and the contention-based signal at the same time or one of them in accordance with the setting. When the ACK or NACK collides with the contention-based signal in an uplink time frame, Receiving circuit is characterized in that receiving the ACK or NACK, and the contention based signal both or simultaneously received, or either one.

(6) Preferably, the circuit device of the present invention is an integrated circuit in which the receiving circuit and the transmitting circuit are integrated .

According to the present invention, contention-based uplink transmission can be performed efficiently.

1 is a conceptual diagram of a wireless communication system according to a first embodiment of the present invention. It is the schematic which shows an example of a structure of the downlink radio frame of this invention. It is the schematic which shows an example of a structure of the uplink radio frame of this invention. It is a sequence chart figure which shows an example of the contention base uplink transmission of this invention. It is a schematic block diagram which shows the structure of the base station apparatus 3 of this invention. It is a schematic block diagram which shows the structure of the mobile station apparatus 1 of this invention. It is a figure which shows an example of the radio | wireless resource allocation of ACK / NACK and contention based uplink transmission of this invention. It is a flowchart figure which shows an example of operation | movement of the mobile station apparatus 1 which concerns on the 1st Embodiment of this invention. It is a flowchart figure which shows an example of operation | movement of the mobile station apparatus 1 which concerns on the 1st modification of the 1st Embodiment of this invention. It is a flowchart figure which shows an example of operation | movement of the mobile station apparatus 1 which concerns on the 2nd modification of the 1st Embodiment of this invention. It is a figure which shows an example of the radio | wireless resource allocation of the channel quality information and contention based uplink transmission of this invention. It is a flowchart figure which shows an example of operation | movement of the mobile station apparatus 1 which concerns on the 2nd Embodiment of this invention. It is a flowchart figure which shows an example of operation | movement of the mobile station apparatus 1 which concerns on the 1st modification of the 2nd Embodiment of this invention. It is a flowchart figure which shows an example of operation | movement of the mobile station apparatus 1 which concerns on the 2nd modification of the 2nd Embodiment of this invention. It is a figure which shows an example of the radio | wireless resource allocation of SRS and contention based uplink transmission of this invention. It is a flowchart figure which shows an example of operation | movement of the mobile station apparatus 1 which concerns on the 3rd Embodiment of this invention. It is a figure which shows an example of the radio | wireless resource allocation of ACK / NACK, SRS, and contention base uplink transmission of this invention. It is a figure which shows an example of the radio | wireless resource allocation of the channel quality information of this invention, SRS, and a contention base uplink transmission. It is a figure which shows an example of the radio | wireless resource allocation of ACK / NACK of this invention, channel quality information, and a contention base uplink transmission. It is a figure which shows an example of the radio | wireless resource allocation of ACK / NACK of this invention, channel quality information, SRS, and a contention base uplink transmission.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

<About wireless communication systems>
FIG. 1 is a conceptual diagram of a radio communication system according to the first embodiment of the present invention. In FIG. 1, the radio communication system includes mobile station apparatuses 1 </ b> A to 1 </ b> C and a base station apparatus 3. FIG.
In the wireless communication (downlink) from the base station apparatus 3 to the mobile station apparatuses 1A to 1C, a synchronization channel (SCH), a downlink pilot channel (or “Downlink Reference Signal: DL RS) ”), physical broadcast channel (PBCH), physical downlink control channel (Physical
Downlink Control Channel: PDCCH), Physical Downlink Shared Channel (Physical Downlin
k Shared Channel (PDSCH), Physical Multicast Channel
l: PMCH), physical control format indicator channel (Physical Control Format I
ndicator Channel (PCFICH), physical HARQ indicator channel (Physical Hybrid)
ARQ Indicator Channel (PHICH) is assigned.

FIG. 1 shows an uplink pilot channel (or “Uplink Reference Signal (Uplink Reference Signal)” in radio communication (uplink) from the mobile station apparatuses 1A to 1C to the base station apparatus 3.
Signal: UL RS) ”. ), Physical uplink control channel (Physical Uplink Con
trol Channel: PUCCH), Physical Uplink Shared Channel
l: PUSCH), Physical Random Access Channel: PRACH
) Is assigned. Hereinafter, the mobile station apparatuses 1A to 1C are referred to as the mobile station apparatus 1.

<About downlink radio frames>
FIG. 2 is a schematic diagram illustrating an example of a configuration of a downlink radio frame according to the present invention. In FIG. 2, the horizontal axis is the time domain, and the vertical axis is the frequency domain. As shown in FIG. 2, a downlink radio frame includes a plurality of downlink physical resource blocks (Physical Resource Blocks: P).
RB) pairs (for example, regions surrounded by broken lines in FIG. 2). The downlink physical resource block pair is a unit such as radio resource allocation, and has a predetermined frequency band (PRB bandwidth: 180 kHz) and time band (2 slots = 1 subframe ( Time frame): 1 ms).

One downlink physical resource block pair is composed of two downlink physical resource blocks (PRB bandwidth × slot) that are continuous in the time domain. One downlink physical resource block (unit surrounded by a thick line in FIG. 2) is composed of 12 subcarriers (15 kHz) in the frequency domain, and 7 OFDMs in the time domain.
It is composed of symbols (71 μs). In the time domain, 7 OFDM (Orthogona
l Slot (0.5ms) composed of Frequency Division Multiplexing symbols,
There is a subframe (1 ms) composed of two slots and a radio frame (10 ms) composed of 10 subframes. In the frequency domain, a plurality of downlink physical resource blocks are arranged according to the downlink bandwidth. 1 subcarrier and 1
A unit composed of one OFDM symbol is referred to as a downlink resource element.

Hereinafter, a channel allocated in a downlink radio frame will be described. In each downlink subframe, for example, a PDCCH, a PDSCH, and a downlink reference signal are allocated. First, PDCCH will be described. PDCCH is arranged from the OFDM symbol at the head of the subframe (the area hatched by the left oblique line in FIG. 2). Note that the number of OFDM symbols in which the PDCCH is arranged is 1 to 3, and is different for each subframe. The PDCCH has a downlink assignment (Downlink assignment,
Also referred to as Downlink grant. ), Downlink control information (Down), which is information used for communication control, configured in an information format such as an uplink grant.
link Control Information: DCI) signal is arranged.

The downlink assignment includes information indicating a modulation scheme for PDSCH, information indicating a coding scheme, information indicating radio resource allocation, HARQ (Hybrid Automatic Repeat).
t Request), a TPC command, and the like. The uplink grant includes information indicating a modulation scheme for PUSCH, information indicating a coding scheme, information indicating radio resource allocation, information regarding HARQ, a TPC command, and the like. Note that HARQ is, for example, the success or failure of the decoding of data information by the mobile station device 1 (base station device 3) (Ac
knowledgement / Negative Acknowledgement: ACK / NACK) to base station device 3 (mobile station device 1)
Mobile station apparatus 1 (base station apparatus 3) cannot decode data information due to an error (NACK
) Base station apparatus 3 (mobile station apparatus 1) retransmits the signal, and mobile station apparatus 1 (base station apparatus 3)
Is a technique for performing a decoding process on a composite signal of a signal received again and a signal already received.

Next, PDSCH will be described. The PDSCH is arranged in an OFDM symbol (region not hatched in FIG. 2) other than the OFDM symbol in which the PDCCH of the subframe is arranged. PDSCH contains data information (transport block: Transport
Block) signal is arranged. The radio resources of the PDSCH are allocated using downlink assignment and are arranged in the same downlink subframe as the PDCCH including this downlink assignment. The downlink reference signal is not shown in FIG. 2 for simplicity of explanation, but the downlink reference signal is distributed and arranged in the frequency domain and the time domain.

<About PDCCH>
Hereinafter, the PDCCH will be described in more detail. The PDCCH is arranged in one or more control channel elements (Control Channel Element: CCE). The control channel element is P
It is composed of a plurality of downlink resource elements distributed in a frequency domain and a time domain within a region where DCCH is arranged (region hatched with a left oblique line in FIG. 2). In addition, a common search area (Common Search Space) and a mobile station apparatus specific search area (User Equipment specific-Search Space) are configured from a plurality of control channel elements.

The common search area is an area common to a plurality of mobile station apparatuses 1 and is an area where a PDCCH for a plurality of mobile station apparatuses 1 and / or a PDCCH for a specific mobile station apparatus 1 is arranged. The common search area is composed of predetermined control channel elements. The mobile station apparatus specific search area is an area where a PDCCH for a specific mobile station apparatus 1 is arranged, and is an area configured for each mobile station apparatus 1. The common search area and the mobile station apparatus specific search area are:
Different common search areas and mobile station apparatus specific search areas are formed for each number of control channel elements in which PDCCHs are arranged. Note that part or all of the common search area and the mobile station apparatus specific search area may overlap, or part or all of different common search areas may overlap, and different mobile stations for the same mobile station apparatus 1 Some or all of the device-specific search areas may overlap, or some or all of the mobile station device-specific search areas for different mobile station devices 1 may overlap.

A plurality of formats are prepared for downlink control information such as downlink assignment and uplink grant. The format of the downlink control information is called a DCI format (DCI format). For example, the DCI format of the uplink grant is DCI format 0 used when the mobile station apparatus 1 transmits PUSCH through one transmission antenna port, and the mobile station apparatus 1 transmits PUSCH to MIMO (Multiple Input Multiple Output) S.
A DCI format 0A and the like used when transmitting with M (Spatial Multiplexing) are prepared. In addition, the DCI format of the downlink grant is determined by the base station apparatus 3 using the PDSCH.
DCI format 1 and DCI format 1A used when transmitting a single transmission antenna port or a plurality of transmission antenna ports using the transmission diversity method, and DCI format 2 used when the base station apparatus transmits PDSCH by MIMO SM. Prepared. There are DCI formats with the same number of bits and different numbers of bits.

The base station apparatus 3 performs the cyclic redundancy check (Cyclic Redundanc) generated based on the downlink control information.
y Check: CRC) code scrambled with RNTI (Radio Network Temporary Identity)
The scrambled sequence is added to the downlink control information. The mobile station apparatus 1 changes the interpretation of the downlink control information depending on which RNTI the cyclic redundancy check code is scrambled. For example, the mobile station apparatus 1 has the C-RN assigned to the mobile station apparatus 1 from the base station apparatus 3.
When the cyclic redundancy check code is scrambled by TI (Cell-Radio Network Temporary Identity), it is determined that the downlink control information indicates a radio resource addressed to the own device.
In addition, the mobile station device 1 has its own device assigned from the base station device 3 or the base station device 3
CB-RNTI (Contention Based-Radio Network Temporary Identity)
When the cyclic redundancy check code is scrambled in (), it is determined that the downlink control information indicates a radio resource for contention based uplink transmission. Hereinafter, the addition of a cyclic redundancy check code scrambled with RNTI to downlink control information is simply expressed as RNTI included in downlink control information or RNTI included in PDCCH.

The base station apparatus 3 encodes the downlink control information according to the number of bits of the control channel element, and arranges it in the common search area or the mobile station apparatus specific search area. The base station apparatus 3 performs the same encoding for the DCI format having the same number of bits, and performs the different encoding for the DCI format having a different number of bits. That is, since the encoding method applied to the DCI format by the base station apparatus 3 differs depending on the number of bits in the DCI format, the decoding method of the DCI format in the mobile station apparatus 1 differs depending on the number of bits in the DCI format. Therefore, the mobile station apparatus 1 determines the DI from the difference in the number of bits in the DCI format or the decoding method.
The type of CI format can be determined. When the number of bits of the DCI format is the same, information for determining the type of the DCI format is included in the DCI format, or a cyclic redundancy check code scrambled with RNTI corresponding to the type of the DCI format is added. Is used to enable the mobile station apparatus 1 to determine the type of the DCI format.

The mobile station apparatus 1 decodes all candidates in which the PDCCH is arranged in the common search area and the mobile station apparatus specific search area, further descrambles a sequence obtained by scrambling the cyclic redundancy check code with the RNTI, When it is detected that there is no error in the descrambled cyclic redundancy check code, it is determined that acquisition of the PDCCH is successful. This process is called blind decoding.

When the downlink control information indicates a radio resource for contention-based uplink transmission, the base station device 3 includes CB-RNTI in DCI format 0 and / or DCI format 0A. Alternatively, the base station apparatus 3 includes CB-RNTI in DCI format 0 or DCI format 0A having the same number of bits as DCI format 0A. The mobile station apparatus 1 determines from the RNTI included in the downlink control information whether the downlink control information indicates a radio resource addressed to a specific mobile station apparatus 1 or a radio resource for contention-based uplink transmission. By doing so, the mobile station apparatus 1 performs different blind decoding between downlink control information indicating radio resources addressed to a specific mobile station apparatus 1 and downlink control information indicating radio resources for contention-based uplink transmission. Don't get better.
Thereby, the load of blind decoding of the mobile station apparatus 1 can be reduced.

The base station device 3 arranges the PDCCH including the C-RNTI in the common search region or the mobile station device specific search region of the mobile station device 1 to which the C-RNTI is assigned. PDCCH including C-RNTI is blind-decoded in the eigensearch area. The base station apparatus 3 includes a PD including a P-RNTI (Paging-Radio Network Temporary Identity) used for scheduling update information of paging information and system information.
SI-RNTI (System I used for scheduling of CCH and system information)
PDCCH including nformation-Radio Network Temporary Identity) and RA-RNTI (Random Access-Radio Network) used for scheduling of random access responses
ork Temporary Identity) in the common search area, the mobile station apparatus 1 includes the PDCCH including P-RNTI and the PDCCH including SI-RNTI in the common search area,
And PDCCH including RA-RNTI is blind-decoded.

The base station apparatus 3 arranges the PDCCH including the CB-RNTI in the common search area, and the mobile station apparatus 1 blind-decodes the PDCCH including the CB-RNTI in the common search area. As described above, by arranging the PDCCH including the CB-RNTI in the common search region, the plurality of mobile station apparatuses 1 performing radio communication with the base station apparatus 3 can perform the PDCC including the CB-RNTI.
The opportunity to detect H can be made equal.

The base station device 3 arranges the PDCCH including the CB-RNTI in the common search region or the mobile station device specific search region, and the mobile station device 1 uses the CB in the common search region and the mobile station device specific search region.
-PDCCH including RNTI may be blind-decoded. When the base station apparatus 3 arranges the PDCCH including the CB-RNTI in the mobile station apparatus specific search area, the base station apparatus 3 is arranged in a portion where the mobile station apparatus specific search areas of the plurality of mobile station apparatuses 3 overlap. Even when the PDCCH including the CB-RNTI is arranged in the mobile station device specific search region,
A plurality of mobile station apparatuses 1 can detect PDCCH including CB-RNTI. As described above, by arranging the PDCCH including the CB-RNTI in the common search area or the mobile station apparatus specific search area, the degree of freedom of arrangement of the PDCCH including the CB-RNTI is increased.

The mobile station apparatus 1 to which uplink radio resources are appropriately allocated from the base station apparatus 3 does not perform contention-based uplink transmission, but uses the radio resources allocated to the mobile station apparatus 1 to the base station apparatus 3. The PUSCH may be transmitted to. Therefore, when the upper layer of the mobile station apparatus 1 of the present invention has data information to be transmitted in the uplink, but the uplink radio resource is not allocated, the PDCCH blind data including CB-RNTI in the physical layer (reception unit) is provided. Instructing to perform coding, the physical layer of the mobile station apparatus 1 performs blind decoding of the PDCCH including the CB-RNTI only when instructed by the higher layer. Thereby, since the mobile station apparatus 1 performs blind decoding of the PDCCH including the CB-RNTI only when necessary, it is possible to efficiently perform the blind decoding on the PDCCH including the CB-RNTI. Further, in order to reduce the collision probability of contention-based uplink transmission, subframes for performing blind decoding on PDCCH including CB-RNTI for each mobile station apparatus 1 are converted into even-numbered or odd-numbered subframes, for example. You may restrict.

<Uplink radio frame>
FIG. 3 is a schematic diagram illustrating an example of a configuration of an uplink radio frame according to the present invention. In FIG. 3, the horizontal axis is the time domain, and the vertical axis is the frequency domain. As illustrated in FIG. 3, the uplink radio frame includes a plurality of uplink physical resource block pairs (for example, an area surrounded by a broken line in FIG. 3). This uplink physical resource block pair is a unit for radio resource allocation or the like, and has a predetermined frequency band (PRB bandwidth: 1).
80 kHz) and time zone (2 slots = 1 subframe: 1 ms).

One uplink physical resource block pair is composed of two uplink physical resource blocks (PRB bandwidth × slot) that are continuous in the time domain. One uplink physical resource block (unit surrounded by a thick line in FIG. 3) is composed of 12 subcarriers (15 kHz) in the frequency domain, and 7 SCs in the time domain.
-Single-Carrier Frequency Division Multiple Access (FDMA) symbol (71μ
s). In the time domain, a slot composed of 7 SC-FDMA symbols (0.5 ms), a subframe composed of 2 slots (1 ms), 1
There is a radio frame (10 ms) composed of 0 subframes. In the frequency domain, a plurality of uplink physical resource blocks are arranged according to the uplink bandwidth. A unit composed of one subcarrier and one SC-FDMA symbol is referred to as an uplink resource element.

Hereinafter, a channel allocated in an uplink radio frame will be described. In each uplink subframe, for example, a PUCCH, a PUSCH, and an uplink reference signal are allocated. First, PUCCH will be described. The PUCCH is allocated to uplink physical resource blocks (regions hatched with left diagonal lines in FIG. 3) at both ends of the uplink bandwidth. The PUCCH includes channel quality information (channel quality information or channel state informa) indicating downlink channel quality and the like.
also called scheduling request (SR) indicating an uplink radio resource allocation request, and ACK / NACK that is a reception response to the PDSCH.
Uplink Control Information (Uplink Control Informa), which is information used for communication control
signal: UCI).

Channel quality information includes CQI (Channel Quality Indicator), PMI (Precoding Matri
x Indicator) and RI (Rank Indicator). The CQI is information indicating channel quality for changing radio transmission parameters such as an error correction scheme of the PDSCH channel, an error correction coding rate, and a data modulation multi-level number. RI is MIM in the downlink
Number of units (streams) of transmission signal sequences of PDSCH, which is information requested by the mobile station apparatus 1 when performing spatial multiplexing transmission in the OSM scheme, and preprocesses transmission signal sequences in advance (Rank)
). The PMI is information required by the mobile station apparatus 1 when performing spatial multiplexing transmission using the MIMO SM scheme, and is information indicating precoding for pre-processing the PDSCH transmission signal sequence.

The PUCCH radio resource is composed of a pair of one physical resource block in the first slot and one physical resource block in the second slot in the subframe, and two physical resource blocks in the first slot. The physical resource blocks in the eye slot have a symmetrical positional relationship in the frequency domain. In addition, a plurality of PUCCH radio resources are code-multiplexed on the pair of physical resource blocks.

Each radio resource in which a PUCCH for transmitting a scheduling request is arranged is a periodic radio resource set for each mobile station apparatus 1 by the base station apparatus 3. Each radio resource in which a PUCCH for transmitting channel quality information is arranged is a periodic radio resource set for each mobile station apparatus 1 by the base station apparatus 3. ACK / NAC
The radio resource for arranging the PUCCH for transmitting K is an uplink subframe (for example, PDS) after a predetermined time from the downlink subframe that received the PDSCH.
The base station apparatus determines which of the PUCCH radio resources in the subframe is allocated in the uplink subframe corresponding to the downlink subframe four times after the downlink subframe that has received the CH. 3 may be set in advance, or may be arranged in a PUCCH radio resource corresponding to a downlink radio resource in which a downlink assignment indicating PDSCH radio resource allocation is arranged.

Next, PUSCH will be described. The PUSCH is assigned to an uplink physical resource block pair (an area not hatched in FIG. 3) other than the uplink physical resource block in which the PUCCH is arranged. In the PUSCH, uplink control information and / or data information (transport block) signals that are information other than uplink control information are arranged. A radio resource of PUSCH is allocated using an uplink grant, and the mobile station apparatus 1 includes a PDC including the uplink grant.
Uplink subframe after a predetermined time from the downlink subframe that has received the CH (for example, the uplink subframe corresponding to the downlink subframe that is four times after the downlink subframe that has received the PDCCH) ).

Next, the uplink reference signal will be described. The uplink reference signal is transmitted together with PUSCH and PUCCH, and is used for demodulation of PUSCH and PUCCH.
Demodulation Reference signal (DMRS), PUSCH, and PUCCH are transmitted independently, and the base station apparatus 3 estimates uplink channels and is used to determine PUSCH radio resource allocation, coding rate, and modulation scheme. Sounding Refer signal
ence Signal: SRS). DMRS is arranged in a predetermined SC-FDMA symbol of a physical resource block that transmits PUSCH and PUCCH. In addition, SC-FDMA symbols in which DMRS is arranged are different between PUSCH and PUCCH. For simplification of explanation, illustration of DMRS is omitted in FIG.

The base station apparatus 3 includes a sounding subframe that is a subframe for reserving radio resources for the mobile station apparatus 1 to transmit SRS, and an S in the sounding subframe.
The bandwidth (number of physical resource blocks) of the radio resource reserved for transmitting the RS is set and notified. Moreover, the base station apparatus 3 sets the sounding subframe and radio | wireless resource which actually transmit SRS for every mobile station apparatus 1, and the mobile station apparatus 1 is SR according to the said setting.
Send S. As shown in FIG. 3, the SRS is always arranged in the last SC-FDMA symbol of the subframe (the 14th SC-FDMA symbol of the subframe).

<About contention-based uplink transmission>
FIG. 4 is a sequence chart showing an example of contention-based uplink transmission according to the present invention. The base station apparatus 3 determines a common CB-RNTI code among the mobile station apparatuses 1 and notifies the mobile station apparatus 1 that performs contention-based uplink transmission of the CB-RNTI (step S100). Note that step S100 can be omitted by determining the CB-RNTI code between the base station apparatus 3 and the mobile station apparatus 1 in advance.

The base station apparatus 3 decides allocation of radio resources for contention-based uplink transmission, and uses a PDCCH including information indicating the radio resource allocation and CB-RNTI as a mobile station for a common search region or any mobile station apparatus 1 It arrange | positions to an apparatus specific search area | region, and transmits to the mobile station apparatus 1 (step S101). When the mobile station apparatus 1 succeeds in detecting one or more PDCCHs including the CB-RNTI, the mobile station apparatus 1 selects one radio resource from the radio resources indicated by the PDCCH including the detected CB-RNTI, and performs contention base Uplink transmission is performed (step S102). In step S102, the mobile station apparatus 1 transmits the PUSCH including the C-RNTI assigned from the base station apparatus 3, and the base station apparatus 3 transmits any mobile station apparatus 1 from the C-RNTI included in the PUSCH. It can be determined whether or not contention-based uplink transmission has been performed.

<Configuration of base station apparatus 3>
FIG. 5 is a schematic block diagram showing the configuration of the base station apparatus 3 of the present invention. As shown,
The base station apparatus 3 includes an upper layer processing unit 101, a control unit 103, a reception unit 105, a transmission unit 107, a channel measurement unit 109, and a transmission / reception antenna 111. The upper layer processing unit 101 includes a radio resource control unit 1011, a scheduling unit 1013, and a downlink control information generation unit 1015. In addition, the receiving unit 105 includes a decoding unit 10.
51, a demodulator 1053, a demultiplexer 1055, and a radio receiver 1057.
The transmission unit 107 includes an encoding unit 1071, a modulation unit 1073, a multiplexing unit 1075, a radio transmission unit 1077, and a downlink reference signal generation unit 1079.

The upper layer processing unit 101 is a packet data integration protocol (Packet Data Convergence Pr
otocol (PDCP) layer, radio link control (Radio Link Control: RLC) layer, and radio resource control (Radio Resource Control: RRC) layer. Further, the upper layer processing unit 101 generates control information for the scheduling unit 1013 and the like to control the receiving unit 105 and the transmitting unit 107 based on the scheduling result and outputs the control information to the control unit 103. The radio resource control unit 1011 included in the upper layer processing unit 101 generates information acquired on the downlink PDSCH or acquires it from the upper node, and outputs the information to the transmission unit 107. Further, the radio resource control unit 1011 manages various setting information of each mobile station apparatus 1. For example, the radio resource control unit 1011 performs RNTI management such as assigning a C-RNTI to the mobile station device 1 and assigning a code to the CB-RNTI.

The scheduling unit 1013 included in the higher layer processing unit 101 receives the PUC from the mobile station device 1.
Uplink control information notified by CH (ACK / NACK, channel quality information, scheduling request), uplink channel quality input from the channel measurement unit, buffer status notified from mobile station apparatus 1 and radio Based on various setting information of each mobile station apparatus 1 set by the resource control unit 1011, scheduling such as radio resource allocation, coding scheme setting, modulation scheme setting, and the like is performed. The scheduling unit 1013 includes a radio resource in which a specific mobile station device 1 arranges a PUSCH from among uplink radio resources, and a PUSC used by an unspecified mobile station device 1 for contention-based uplink transmission.
A radio resource for allocating H is allocated. The scheduling unit 1013 assigns the channel measurement unit 1 when allocating radio resources for arranging the PUSCH to a specific mobile station device 1.
Based on the uplink channel measurement result input from 09, radio resources with good channel quality are preferentially allocated. Next, the scheduling unit 1013 selects the specific mobile station device 1
A radio resource for contention-based uplink transmission is allocated from radio resources that are not allocated to.

In addition, the scheduling unit 1013 may select a PDSC from downlink radio resources.
A radio resource for allocating H is determined. The scheduling unit 1013 generates a downlink control information generation unit 101 so as to generate downlink control information indicating the radio resource allocation.
5 outputs control information. Also, the scheduling unit 1013 allocates one or a plurality of control channel elements for arranging the downlink control information generated by the downlink control information generation unit 1015 from the common search region or the mobile station apparatus specific search region. The scheduling unit 1013 assigns one or a plurality of control channel elements in which downlink control information including C-RNTI is allocated to the mobile station device specific search region and the common search region of the mobile station device 1 to which the C-RNTI is allocated. Select from. The scheduling unit 1013 selects one or a plurality of control channel elements in which downlink control information including CB-RNTI is arranged as a common search region or a mobile station device specific search region of the common search region and the plurality of mobile station devices 1. Select from overlapping areas. In addition, when the base station apparatus 3 arrange | positions the control channel element which arrange | positions the downlink control information containing CB-RNTI in a mobile station apparatus specific search area | region, the mobile station apparatus specific of several mobile station apparatuses 1 is carried out. Search areas do not have to overlap.

Further, the scheduling unit 1013 allocates radio resources for transmitting SRS and PUCCH radio resources for transmitting channel quality information for each mobile station apparatus 1. The base station device 3 transmits a radio resource control signal indicating the radio resource allocation to the PDS.
It transmits to the mobile station apparatus 1 using CH.

A downlink control information generation unit 1015 included in the higher layer processing unit 101 generates downlink control information indicating uplink or downlink radio resource allocation based on the control information input from the scheduling unit 1013. Also, the downlink control information generation unit 1015 generates a cyclic redundancy check code from the generated downlink control information, scrambles the generated cyclic redundancy check code with RNTI, and adds it to the downlink control information. The downlink control information generation unit 1015 scrambles the cyclic redundancy check code with the C-RNTI assigned to the mobile station apparatus 1 when the downlink control information indicates assignment of radio resources to the specific mobile station apparatus 1. If the downlink control information indicates radio resource allocation for contention-based uplink transmission, the cyclic redundancy check code is set to CB-
Scramble with RNTI. Moreover, the downlink control information generation part 1015 is C-RNT.
The downlink control information including I and the downlink control information including CB-RNTI are generated as a DCI format having the same number of bits or the same DCI format.

The control unit 103 generates a control signal for controlling the reception unit 105 and the transmission unit 107 based on the control information from the higher layer processing unit 101. The control unit 103 outputs the generated control signal to the reception unit 105 and the transmission unit 107 to control the reception unit 105 and the transmission unit 107.

The receiving unit 105 receives the transmission / reception antenna 11 according to the control signal input from the control unit 103.
1, the received signal received from the mobile station apparatus 1 is separated, demodulated, and decoded, and the decoded information is output to the upper layer processing unit 101. The radio reception unit 1057 converts an uplink signal received via the transmission / reception antenna 111 into an intermediate frequency (down covert),
Remove unwanted frequency components, control the amplification level so that the signal level is properly maintained,
Based on the in-phase component and the quadrature component of the received signal, quadrature demodulation is performed, and the quadrature demodulated analog signal is converted into a digital signal. The wireless reception unit 1057 removes a portion corresponding to a guard interval (GI) from the converted digital signal. Wireless receiver 1
057 is a fast Fourier transform (Fast Fourier Transform) for the signal from which the guard interval is removed.
Transform: FFT) is performed, and a frequency domain signal is extracted and output to the demultiplexing unit 1055.

The demultiplexing unit 1055 converts the signal input from the wireless receiving unit 1057 into PUCCH and PUS.
Separated into signals such as CH and uplink reference signal. Note that this separation is performed based on radio resource allocation information that is determined in advance by the scheduling unit 1013 by the base station device 3 and notified to each mobile station device 1. In addition, demultiplexing section 1055 compensates for the propagation paths of PUCCH and PUSCH based on the propagation path estimation value input from channel measurement section 109. Also,
The demultiplexing unit 1055 outputs the separated uplink reference signal to the channel measurement unit 109.

The demodulating unit 1053 converts the PUSCH into an inverse discrete Fourier transform (Inverse Discrete Fourier Tra).
nsform: IDFT) to obtain modulation symbols, and for each of the PUCCH and PUSCH modulation symbols, binary phase shift keying (BPSK), quadrature phase shift keying (Quadrature Phase Shift Keying: QPSK) ), 16-value quadrature amplitude modulation (16 Quadrature Ampl
itude Modulation: 16QAM), 64-Quadrature Amplitude Modulation
: 64QAM) or the like, or the base station apparatus 3 demodulates the received signal using a modulation scheme notified in advance to each mobile station apparatus 1 by downlink control information.

The decoding unit 1051 encodes the demodulated PUCCH and PUSCH encoded bits in a predetermined encoding scheme, or a code that the base station apparatus 3 notifies the mobile station apparatus 1 in advance with an uplink grant. The decoding is performed at the conversion rate, and the decoded data information and the uplink control information are output to the upper layer processing unit 101. Channel measurement section 109 measures an estimated channel value, uplink channel quality, and the like from the uplink reference signal input from demultiplexing section 1055, and outputs the result to demultiplexing section 1055 and higher layer processing section 101.

The transmission unit 107 generates a downlink reference signal according to the control signal input from the control unit 103, encodes and modulates data information and downlink control information input from the higher layer processing unit 101, PDCCH, The PDSCH and the downlink reference signal are multiplexed, and the signal is transmitted to the mobile station device 1 via the transmission / reception antenna 111.

The encoding unit 1071 determines the downlink control information and data information input from the higher layer processing unit 101 in advance, such as turbo encoding, convolutional encoding, and block encoding, or is determined by the scheduling unit 1013. Encoding is performed. The modulation unit 1073 includes the encoding unit 1
The coded bits input from 071 are modulated by a predetermined modulation scheme such as QPSK, 16QAM, 64QAM, or the like determined by the scheduling unit 1013. The downlink reference signal generation unit 1079 uses, as a downlink reference signal, a sequence known by the mobile station device 1 that is obtained by a predetermined rule based on a cell identifier (Cell ID) for identifying the base station device 3 or the like. Generate. The multiplexing unit 1075 multiplexes each modulated channel and the generated downlink reference signal.

The radio transmission unit 1077 performs inverse fast Fourier transform (inverse fast Fourier transform) on the multiplexed modulation symbols.
ourier Transform (IFFT) to perform OFDM modulation and OFDM modulated OFD
Add guard interval to M symbol, generate baseband digital signal, convert baseband digital signal to analog signal, generate in-phase and quadrature components of intermediate frequency from analog signal, extra for intermediate frequency band The intermediate frequency signal is removed, the intermediate frequency signal is converted to a high frequency signal (up convert), the excess frequency component is removed, the power is amplified, and output to the transmission / reception antenna 111 for transmission.

<Configuration of mobile station apparatus 1>
FIG. 6 is a schematic block diagram showing the configuration of the mobile station apparatus 1 according to this embodiment. As illustrated, the mobile station apparatus 1 includes an upper layer processing unit 201, a control unit 203, a receiving unit 205, and a transmitting unit 2.
07, a channel measurement unit 209, and a transmission / reception antenna 211. The upper layer processing unit 201 includes a radio resource control unit 2011 and a scheduling unit 2013.
It is comprised including. The control unit includes a transmission signal control unit 2031. The reception unit 205 includes a decoding unit 2051, a demodulation unit 2053, a demultiplexing unit 2055, and a wireless reception unit 2057. The transmission unit 207 includes an encoding unit 2071 and a modulation unit 2.
073, a multiplexing unit 2075, a wireless transmission unit 2077, and an uplink reference signal generation unit 2079.

The upper layer processing unit 201 converts uplink data information generated by user operations, etc.
The data is output to the transmission unit 207. The upper layer processing unit 201 performs processing of the packet data integration protocol layer, the radio link control layer, and the radio resource control layer. Further, the upper layer processing unit 201 generates control information for controlling the receiving unit 205 and the transmitting unit 207 based on the downlink control information and outputs the control information to the control unit 203. The radio resource control unit 2011 included in the upper layer processing unit 201 manages various setting information of the own device. For example, the radio resource control unit 2011 manages RNTI such as C-RNTI and CB-RNTI. Also, the radio resource control unit 2011 generates information to be arranged in each uplink channel, and transmits the transmission unit 2
Output to 07.

The scheduling unit 2013 included in the higher layer processing unit 201 receives the PDC from the base station device 3.
Radio resource for transmitting SRS set by downlink control information notified by CH and radio resource control signal notified by PDSCH, P for transmitting channel quality information
Based on various setting information of the own device managed by the radio resource control unit 2011 such as a radio resource of UCCH, control information is generated to control the reception unit 205 and the transmission unit 207,
Output to the control unit 203. The scheduling unit 2013 is configured to detect D to be detected by the mobile station device 1.
Control information for controlling the receiving unit 205 so as to blind-decode the downlink control information in the CI format in the common search region and / or the mobile station apparatus specific search region is generated and output to the control unit 203. Scheduling unit 2013 uses C-RN
PDCCH including TI is blind-decoded in common search area and mobile station apparatus specific search area, and PDCCH including CB-RNTI is decoded in common search area or common search area and mobile station apparatus specific search area. Control information for controlling the receiving unit 205 is generated and output to the control unit 203.

Note that the scheduling unit 2013 does not always perform blind decoding of the PDCCH including the CB-RNTI, but allocates PUSCH radio resources dedicated to the own apparatus from the base station apparatus 3 even though there is data information to be allocated to the PUSCH. Only when it is not possible, the receiving unit 205 may generate control information for controlling the receiving unit 205 to blindly code the PDCCH including the CB-RNTI, and output the control information to the control unit 203. The scheduling unit 2013 controls the receiving unit 205 to demultiplex, demodulate, and decode the PDSCH based on the downlink assignment input from the receiving unit 205, and to the uplink grant input from the receiving unit 205. Based on this, control information for controlling transmission section 207 so as to perform coding, modulation, and multiplexing of PUSCH is generated and output to control section 203.

In addition, when the uplink grant includes the C-RNTI assigned to the own apparatus, the scheduling unit 2013 selects the entire radio resource indicated by the uplink grant, and the uplink grant includes the CB-RNTI. Control information for controlling the transmitting unit 207 to randomly select one radio resource from among the plurality of radio resources indicated by the uplink grant and multiplex the PUSCH to the selected radio resource. And output to the control unit 203. In addition, when the scheduling unit 2013 succeeds in the blind decoding of a plurality of uplink grants including the CB-RNTI, the scheduling unit 2013 randomly selects one radio resource among all the plurality of radio resources indicated by each of the plurality of uplink grants. Then, control information for controlling the transmission unit 207 to multiplex the PUSCH to the selected radio resource is generated and output to the control unit 203.

The control unit 203 generates a control signal for controlling the reception unit 205 and the transmission unit 207 based on the control information from the higher layer processing unit 201. The control unit 203 outputs the generated control signal to the reception unit 205 and the transmission unit 207 to control the reception unit 205 and the transmission unit 207. The transmission signal control unit 2031 included in the control unit 203 is configured to transmit PUSCH and PUCCH (channel quality information and / or ACK / NAC) instructed to be transmitted from the scheduling unit.
K) When SRS collides in the same uplink subframe, it is determined which signal to transmit.

The transmission signal control unit 2031 transmits both the data information and the ACK / NACK on the PUCSCH when the PUSCH allocated by the uplink grant including the C-RNTI and the ACK / NACK collide in the same uplink subframe. . Transmission signal control unit 2
031 transmits both the data information and the channel quality information on the PUCSCH when the PUSCH allocated by the uplink grant including the C-RNTI and the channel quality information collide with each other in the same uplink subframe. When the PUSCH assigned by the uplink grant including the C-RNTI and the SRS collide with each other in the same uplink subframe, the transmission signal control unit 2031 collides with the first to thirteenth SC- in the uplink subframe. The PUSCH is transmitted using the FDMA symbol, and the SRS is transmitted using the 14th SC-FDMA symbol. In addition, PU allocated by uplink grant including CB-RNTI
The case where SCH and PUCCH and / or SRS collide will be described later.

The receiving unit 205 receives the transmission / reception antenna 21 according to the control signal input from the control unit 203.
1, the received signal received from the base station apparatus 3 is separated, demodulated, and decoded, and the decoded information is output to the upper layer processing unit 201. The radio reception unit 2057 converts a downlink signal received via the transmission / reception antenna 211 into an intermediate frequency (down-conversion), removes unnecessary frequency components, and an amplification level so that the signal level is appropriately maintained. , And quadrature demodulation based on the in-phase and quadrature components of the received signal, and converting the quadrature demodulated analog signal into a digital signal. The radio reception unit 2057 removes a portion corresponding to the guard interval from the converted digital signal, performs fast Fourier transform on the signal from which the guard interval is removed, and extracts a frequency domain signal.

The demultiplexing unit 2055 separates the extracted signal into a PDCCH, a PDSCH, and a downlink reference signal. This separation is performed based on radio resource allocation information notified by the downlink control information. Further, demultiplexing section 2055 compensates for the propagation paths of PDCCH and PDSCH from the estimated propagation path values input from channel measurement section 209. Also, the demultiplexing unit 2055 outputs the separated downlink reference signal to the channel measurement unit 209.

Demodulation section 2053 demodulates the QPSK modulation scheme for PDCCH and outputs the result to decoding section 2051. The decoding unit 2051 attempts blind decoding of the PDCCH, and when the blind decoding is successful, the decoding unit 2051 outputs the decoded downlink control information and the RNTI included in the downlink control information to the higher layer processing unit 201. Demodulation section 2053 demodulates the PDSCH according to the modulation scheme notified by downlink control information such as QPSK, 16QAM, and 64QAM, and outputs the result to decoding section 2051. The decryption unit 2051
Decoding is performed on the coding rate notified by the downlink control information, and the decoded data information is output to the upper layer processing section 201.

The channel measurement unit 209 measures downlink path loss and channel quality information from the downlink reference signal input from the demultiplexing unit 2055, and uses the measured path loss as the upper layer processing unit 2.
The measured channel quality is output to the transmission unit 207. Further, the channel measurement unit 209 calculates an estimated value of the downlink propagation path from the downlink reference signal, and the demultiplexing unit 2
Output to 055.

The transmission unit 207 generates an uplink reference signal (SRS and / or DMRS) according to the control signal input from the control unit 203, encodes and modulates the data information input from the higher layer processing unit 201, and performs PUCCH , PUSCH, and the generated uplink reference signal are multiplexed and transmitted to the base station apparatus 3 via the transmission / reception antenna 211. Encoding unit 2071
Performs coding such as convolutional coding and block coding on the uplink control information input from the higher layer processing unit 201, and turbo code based on the coding rate notified by the downlink control information. To do. The modulation unit 2073 modulates the coded bits input from the coding unit 2071 using a modulation method notified by downlink control information such as BPSK, QPSK, 16QAM, 64QAM, or a modulation method predetermined for each channel. .

The uplink reference signal generation unit 2079 is a cell identifier for identifying the base station apparatus 3, S
The base station device 3 generates a known sequence that is determined by a predetermined rule based on the bandwidth in which the RS or DMRS is arranged. The multiplexing unit 2075 rearranges the PUSCH modulation symbols in parallel according to the control signal input from the control unit 203, and then performs discrete Fourier transform (Discrete transform).
te Fourier Transform (DFT), and PUCCH and PUSCH signals and the generated DMRS and SRS are multiplexed.

The wireless transmission unit 2077 performs inverse fast Fourier transform on the multiplexed signal, performs SC-FDMA modulation, adds a guard interval to the SC-FDMA-modulated SC-FDMA symbol, and generates a baseband digital signal And converting the baseband digital signal to an analog signal, generating in-phase and quadrature components of an intermediate frequency from the analog signal,
An excess frequency component with respect to the intermediate frequency band is removed, an intermediate frequency signal is converted to a high frequency signal (up-conversion), an extra frequency component is removed, power is amplified, and output to the transmission / reception antenna 211 for transmission. .

<Operation of mobile station device>
FIG. 7 is a diagram illustrating an example of allocation of radio resources for ACK / NACK and contention-based uplink transmission according to the present invention. If the ACK / NACK and contention-based uplink transmission collide in the same uplink subframe as shown in FIG. 7, the mobile station apparatus 1 performs contention-based uplink transmission without transmitting ACK / NACK. . FIG. 8 is a flowchart illustrating an example of the operation of the mobile station device 1 according to the first embodiment of this invention. The mobile station apparatus 1 assigns PUSCH radio resources for contention-based uplink transmission and CB-RN transmitted by the base station apparatus 3 in a certain downlink subframe.
A PDCCH including a TI is received, and a contention-based uplink transmission signal to be transmitted in an uplink subframe after a predetermined time from the downlink subframe that has received the PDCCH is generated (step S100).

The mobile station apparatus 1 receives the PDSCH transmitted from the base station apparatus 3 to itself in a certain downlink subframe, decodes it, and uplinks a predetermined time after the downlink subframe that has received the PDSCH. ACK / for the PDSCH transmitted in the subframe of
NACK is generated (step S101). When the mobile station apparatus 1 recognizes that the contention-based uplink transmission signal and ACK / NACK collide in the same uplink subframe (step S102), the mobile station apparatus 1 transmits the contention-based uplink without transmitting the ACK / NACK. A link transmission signal is transmitted (step S103). As a result, the mobile station apparatus 1 can perform contention-based uplink transmission without delay, and can improve uplink latency.

In addition, even if ACK / NACK and contention-based uplink transmission collide in the same uplink subframe, mobile station apparatus 1 does not transmit ACK / NACK.
Downlink communication can be continued normally. Specifically, the mobile station apparatus 3 receives ACK / N
When the ACK is not transmitted, the base station device 3 determines that the mobile station device 1 has not received the PDSCH and retransmits the PDSCH. When the mobile station apparatus 1 does not transmit ACK, it is only necessary to transmit ACK to the retransmitted PDSCH. When the mobile station apparatus 1 does not transmit a NACK, the mobile station apparatus 1 may perform decoding using the retransmitted PDSCH.

In addition, the mobile station device 1 sets the transmission power of contention-based uplink transmission to the transmission power that can be physically transmitted by the mobile station device 1 or the base station device 3 sets the mobile station device 1 for the mobile station device 1. If the maximum transmission power is exceeded, ACK / NACK may be transmitted without performing contention-based uplink transmission. Thereby, ACK / NACK can be transmitted reliably.

(First modification of the first embodiment)
Hereinafter, a first modification of the first embodiment of the present invention will be described.

In the first modification of the first embodiment of the present invention, the mobile station apparatus 1, when ACK / NACK and contention-based uplink transmission collide in the same uplink subframe as shown in FIG. ACK / NAC without contention-based uplink transmission
Send K. FIG. 9 is a flowchart showing an example of the operation of the mobile station apparatus 1 according to the first modification of the first embodiment of the present invention. The mobile station apparatus 1 receives the PDCCH including the PUSCH radio resource allocation for contention-based uplink transmission and CB-RNTI transmitted by the base station apparatus 3 in a certain downlink subframe, and the downlink received the PDCCH. A contention-based uplink transmission signal to be transmitted in an uplink subframe after a predetermined time from the link subframe is generated (step S200).

The mobile station apparatus 1 receives the PDSCH transmitted from the base station apparatus 3 to itself in a certain downlink subframe, decodes it, and uplinks a predetermined time after the downlink subframe that has received the PDSCH. ACK / for the PDSCH transmitted in the subframe of
A NACK is generated (step S201). When the mobile station apparatus 1 recognizes that the contention-based uplink transmission signal and ACK / NACK collide in the same uplink subframe (step S202), the mobile station apparatus 1 does not perform the contention-based uplink transmission. NACK is transmitted (step S203). Thereby, the mobile station apparatus 1 is ACK
/ NACK can be reliably transmitted, and the base station apparatus 3 does not perform unnecessary retransmission of PDSCH. When the mobile station apparatus 1 does not perform contention-based uplink transmission, an uplink grant including CB-RNTI may be detected in subsequent subframes, and contention-based uplink transmission may be performed. Alternatively, the mobile station apparatus 1 may have the base station apparatus 3 allocate PUSCH radio resources dedicated to the mobile station apparatus 1 by transmitting a scheduling request using periodically allocated radio resources for scheduling requests. .

Note that when the mobile station apparatus 1 detects the uplink grant including the CB-RNTI and the downlink assignment including the C-RNTI at the same time, the mobile station apparatus 1 may discard the uplink grant including the CB-RNTI. As a result, the ACK / NACK for the PDSCH whose radio resource is indicated by the downlink assignment including the C-RNTI and the radio resource for the uplink based on the contention-based uplink transmission indicated by the uplink grant including the CB-RNTI are the same. Colliding with the frame can be avoided.

In addition, when ACK / NACK and contention-based uplink transmission collide in the same uplink subframe, the mobile station apparatus 1 corresponds to the PDSCH corresponding to ACK / NACK.
Whether to transmit ACK / NACK or not to perform contention-based uplink transmission may be selected according to the type of data information transmitted in (1). For example, the data information transmitted on the PDSCH corresponding to ACK / NACK is a radio resource control signal or MAC (Medium A
ccess Control) In the case of important information such as CE (Control Element), ACK / NACK is transmitted without performing contention-based uplink transmission, and data information transmitted by PDSCH corresponding to ACK / NACK is transmitted. In other cases, contention-based uplink transmission may be performed without transmitting ACK / NACK.

(Second modification of the first embodiment)
Hereinafter, a second modification of the first embodiment of the present invention will be described.

In the second modification of the first embodiment of the present invention, the mobile station apparatus 1, when ACK / NACK and contention-based uplink transmission collide in the same uplink subframe as shown in FIG. The contention-based uplink transmission and ACK / NACK are transmitted simultaneously on each radio resource. FIG. 10 is a flowchart showing an example of the operation of the mobile station apparatus 1 according to the second modification of the first embodiment of the present invention. The mobile station device 1 receives the PDCCH including the radio resource allocation of the PUSCH for contention-based uplink transmission and the CB-RNTI transmitted by the base station device 3 in a certain downlink subframe,
A contention-based uplink transmission signal to be transmitted in an uplink subframe after a predetermined time from the downlink subframe that has received the PDCCH is generated (step S).
300).

The mobile station apparatus 1 receives the PDSCH transmitted from the base station apparatus 3 to itself in a certain downlink subframe, decodes it, and uplinks a predetermined time after the downlink subframe that has received the PDSCH. ACK / for the PDSCH transmitted in the subframe of
NACK is generated (step S301). When the mobile station apparatus 1 recognizes that the contention-based uplink transmission signal and the ACK / NACK collide in the same uplink subframe (step S302), the mobile station apparatus 1 performs the contention-based uplink transmission and the ACK / N.
Both ACKs are transmitted (step S303). As a result, the mobile station apparatus 1 can perform contention-based uplink transmission without delay, and ACK / NACK.
Can be reliably transmitted to prevent the base station apparatus 3 from resending the PDSCH. However, to transmit contention-based uplink transmission and ACK / NACK at the same time,
Compared with the first embodiment and the first modification of the first embodiment, higher transmission power is required.

The mobile station apparatus 1 transmits a power headroom report indicating the remaining transmission power of the mobile station apparatus 1 to the base station apparatus 3, and the base station apparatus 3 determines that the mobile station apparatus 1 is based on the power headroom report. It may be set whether contention-based uplink transmission and ACK / NACK may be transmitted simultaneously, or only one of them may be transmitted. As a result, the optimum contention-based uplink transmission and ACK are performed according to the remaining transmission power of the mobile station apparatus 1.
The base station apparatus 3 can select the / NACK transmission method.

Also, the mobile station apparatus 1 performs contention-based uplink transmission and ACK / NACK in advance.
Even if the base station apparatus 3 is set to transmit contention base, uplink transmission, and ACK / NACK at the same time, the contention base uplink transmission and ACK / NACK are set. If the total transmission power exceeds the transmission power that the mobile station apparatus 1 can physically transmit or the maximum transmission power set by the base station apparatus 3 for the mobile station apparatus 1, the contention base ACK / NACK may be transmitted without performing uplink transmission. Thereby, ACK / NACK can be transmitted reliably.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described.

FIG. 11 is a diagram illustrating an example of allocation of channel quality information and radio resources for contention-based uplink transmission according to the present invention. In the second embodiment of the present invention, the mobile station apparatus 1 transmits channel quality information when channel quality information and contention-based uplink transmission collide in the same uplink subframe as shown in FIG. Contention-based uplink transmission. FIG. 12 is a flowchart illustrating an example of the operation of the mobile station device 1 according to the second embodiment of this invention. The mobile station apparatus 1 uses the PUSCH for contention-based uplink transmission transmitted by the base station apparatus 3 in a certain downlink subframe.
A PDCCH including a radio resource allocation and CB-RNTI is received, and a contention-based uplink transmission signal to be transmitted in an uplink subframe after a predetermined time from the downlink subframe that has received the PDCCH is generated ( Step S400).

The mobile station apparatus 1 calculates and generates channel quality information to be transmitted using the radio resource allocated to the base station apparatus 3 based on the received downlink reference signal (step S401). When the mobile station apparatus 1 recognizes that the contention-based uplink transmission signal and the channel quality information collide in the same uplink subframe (step S302), the mobile station apparatus 1 transmits the contention-based uplink without transmitting the channel quality information. A link transmission signal is transmitted (step S303). As a result, the mobile station apparatus 1 can perform contention-based uplink transmission without delay, and can improve uplink latency.

(First Modification of Second Embodiment)
Hereinafter, a first modification of the second embodiment of the present invention will be described.

In the first modification of the second embodiment of the present invention, when the channel quality information and contention-based uplink transmission collide in the same uplink subframe as shown in FIG. Transmit channel quality information without performing tension-based uplink transmission. FIG. 13 is a flowchart showing an example of the operation of the mobile station apparatus 1 according to the first modification of the second embodiment of the present invention. The mobile station apparatus 1 receives the PDCCH including the PUSCH radio resource allocation for contention-based uplink transmission and CB-RNTI transmitted by the base station apparatus 3 in a certain downlink subframe, and the downlink received the PDCCH. A contention-based uplink transmission signal to be transmitted in an uplink subframe after a predetermined time from the link subframe is generated (step S500).

The mobile station apparatus 1 calculates and generates channel quality information to be transmitted using the radio resource allocated to the base station apparatus 3 based on the received downlink reference signal (step S501). When the mobile station apparatus 1 recognizes that the contention-based uplink transmission signal and the channel quality information collide in the same uplink subframe (step S502), the mobile station apparatus 1 performs the channel quality information without performing the contention-based uplink transmission. Is transmitted (step S503).
). Thereby, since the mobile station apparatus 1 can transmit channel quality information to the base station apparatus 3 reliably, the base station apparatus 3 can perform efficient PDSCH scheduling in consideration of the channel quality information.

(Second modification of the second embodiment)
Hereinafter, a second modification of the second embodiment of the present invention will be described.

In the second modification of the second embodiment of the present invention, when channel quality information and contention-based uplink transmission collide in the same uplink subframe as shown in FIG. Transmit both tension-based uplink transmission and channel quality information. FIG. 14 is a flowchart showing an example of the operation of the mobile station apparatus 1 according to the second modification of the second embodiment of the present invention. The mobile station apparatus 1 receives the PDCCH including the PUSCH radio resource allocation for contention-based uplink transmission and CB-RNTI transmitted by the base station apparatus 3 in a certain downlink subframe, and the downlink received the PDCCH. A contention-based uplink transmission signal to be transmitted in an uplink subframe after a predetermined time from the link subframe is generated (step S600).

The mobile station apparatus 1 calculates and generates channel quality information to be transmitted using the radio resource allocated to the base station apparatus 3 based on the received downlink reference signal (step S601). When the mobile station apparatus 1 recognizes that the contention-based uplink transmission signal and the channel quality information collide with each other in the same uplink subframe (step S602), the channel quality information is transmitted without performing the contention-based uplink transmission. Is transmitted (step S603).
). Thereby, since the mobile station apparatus 1 can transmit channel quality information to the base station apparatus 3 reliably, the base station apparatus 3 can perform efficient PDSCH scheduling in consideration of the channel quality information. Also, the mobile station apparatus 1 can perform contention-based uplink transmission without delay, and can improve the uplink latency.

Note that the base station apparatus 3 can instruct the mobile station apparatus 1 to transmit channel quality information without data using the uplink grant. At this time, the mobile station apparatus 1 uses the PUSCH.
Only channel quality information is transmitted using. Even in the case where the PUSCH having only the channel quality information collides with the contention-based uplink transmission in the same uplink subframe, the second embodiment of the present invention, the first modification of the second embodiment, The second modification of the second embodiment can be applied.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described.

In the third embodiment of the present invention, in the sounding subframe set by the base station apparatus 3, the frequency band of the radio resource reserved for transmitting the SRS and the PUSCH
When at least a part of the frequency band of the mobile station apparatus 1 overlaps, and the mobile station apparatus 1 has PUSCH and SR
When S is transmitted in the same subframe, PUSCH is not arranged in the 14th SC-FDMA symbol. Thereby, the mobile station apparatus 1 can transmit PUSCH with the 1st to 13th SC-FDMA symbol and transmit SRS with the 14th SC-FDMA symbol in the same subframe. Furthermore, in the third embodiment of the present invention, when the SRS collides with the PUSCH for contention-based uplink transmission in the same uplink subframe as shown in FIG. 15, the mobile station apparatus 1 does not transmit the SRS. Contention-based uplink transmission.

Further, in the sounding subframe, the frequency band of the radio resource reserved for transmitting the SRS and the frequency band of the PUSCH for contention-based uplink transmission do not overlap at all, and the subframe is for transmitting the SRS. However, the mobile station device 1 is 1
The PUSCH for contention-based uplink transmission is arranged in the 14th to 14th SC-FDMA symbols. In other words, the mobile station apparatus 1 completely overlaps the frequency band of the radio resource reserved for transmitting the SRS and the frequency band of the PUSCH for contention-based uplink transmission regardless of whether or not it is a subframe for transmitting the SRS. If not, the first to fourteenth SC-FDMA symbols are assigned P for contention-based uplink transmission.
When the USCH is arranged and the frequency band of the radio resource reserved for transmitting the SRS and the frequency band of the PUSCH for contention-based uplink transmission partially overlap,
A PUSCH for contention-based uplink transmission is arranged in the 1st to 14th SC-FDMA symbols.

Thereby, even if the base station apparatus 3 does not know whether the mobile station apparatus 1 that performs contention-based uplink transmission transmits SRS or not, the SC- in which the PUSCH for contention-based uplink transmission is arranged. FDMA symbols can be known. FIG. 16 is a flowchart showing an example of the operation of the mobile station apparatus 1 according to the third embodiment of the present invention.
The mobile station apparatus 1 receives the PDCCH including the PUSCH radio resource allocation for contention-based uplink transmission and CB-RNTI transmitted by the base station apparatus 3 in a certain downlink subframe, and the downlink received the PDCCH. A contention-based uplink transmission signal to be transmitted in an uplink subframe after a predetermined time from the link subframe is generated (step S700).

The mobile station device 1 generates an SRS to be transmitted using the radio resource assigned to the base station device 3 (step S701). When the mobile station apparatus 1 recognizes that the contention-based uplink transmission signal and the SRS have collided in the same uplink subframe (step S)
702), a contention-based uplink transmission signal is transmitted without transmitting the SRS (
Step S703).

The first embodiment of the present invention (or the first modification of the first embodiment, the second modification of the first embodiment) and the second embodiment (or the second embodiment). At least two of the first modification and the second modification of the second embodiment) and the third embodiment can be applied to the wireless communication system at the same time. For example, as shown in FIG. 17, when contention-based uplink transmission collides with ACK / NACK and SRS in the same uplink subframe, mobile station apparatus 1 does not transmit ACK / NACK and SRS, but contention-based Uplink transmission may be performed or AC without SRS and contention-based uplink transmission
K / NACK may be sent, or A without contention-based uplink transmission
CK / NACK and SRS may be transmitted, or contention-based uplink transmission and A
CK / NACK and SRS may be transmitted. When transmitting ACK / NACK and SRS at the same time, ACK / NACK is not transmitted in the 14th SC-FDMA symbol.
Send only.

Also, as shown in FIG. 18, when contention-based uplink transmission, channel quality information, and SRS collide in the same uplink subframe, the mobile station apparatus 1 does not transmit the channel quality information and SRS, but the contention base Uplink transmission may be performed, channel quality information may be transmitted without performing SRS and contention-based uplink transmission, or contention-based uplink transmission and channel quality information may be transmitted.

Further, as shown in FIG. 19, when contention-based uplink transmission, ACK / NACK, and channel quality information collide in the same uplink subframe, the mobile station apparatus 1
May perform contention-based uplink transmission without transmitting ACK / NACK and channel quality information, or ACK / NA without performing contention-based uplink transmission.
CK and channel quality information may be transmitted, contention based uplink transmission and C
QI and ACK / NACK may be transmitted. When ACK / NACK and channel quality information are transmitted simultaneously, ACK / NACK and channel quality information may be transmitted using different PUCCH radio resources, or PUCCH radio resources allocated to the channel quality information. ACK / NACK and channel quality information may be transmitted together.

Also, as shown in FIG. 20, when contention-based uplink transmission, ACK / NACK, channel quality information, and SRS collide in the same uplink subframe, mobile station apparatus 1 receives ACK / NACK, channel quality information, and SRS. Contention-based uplink transmission may be performed without transmitting the contention-based uplink transmission and SRS.
ACK / NACK and channel quality information may be transmitted without transmitting ACK, or contention-based uplink transmission, ACK / NACK and channel quality information may be transmitted. A
When transmitting CK / NACK and channel quality information at the same time, ACK / NACK and channel quality information may be transmitted with different PUCCH radio resources, or ACK with PUCCH radio resources allocated for channel quality information. / NACK and channel quality information may be transmitted together.

In the first to third embodiments described above, the contention-based uplink transmission is transmitted on the PUSCH, but the contention-based uplink transmission is transmitted on the PUCCH.
The present invention can also be applied to the case of being transmitted by the Internet.

A program that operates in the base station apparatus 3 and the mobile station apparatus 1 related to the present invention is a program (computer function) that controls a CPU (Central Processing Unit) or the like so as to realize the functions of the above-described embodiments related to the present invention. Program). And
Information handled by these devices is temporarily stored in RAM (Random Access Memory) during processing.
), And then various ROMs such as Flash ROM (Read Only Memory) and H
The data is stored in a DD (Hard Disk Drive), read by the CPU as necessary, and corrected and written.

In addition, you may make it implement | achieve the mobile station apparatus 1 in the embodiment mentioned above, and a part of base station apparatus 3 with a computer. In that case, the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed. Here, the “computer system” is a computer system built in the mobile station apparatus 1 or the base station apparatus 3 and includes an OS and hardware such as peripheral devices.

The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. “Computer-readable recording medium”
A computer that serves as a server or client in such a case that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. A volatile memory inside the system may be included that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

Moreover, you may implement | achieve part or all of the mobile station apparatus 1 in the embodiment mentioned above and the base station apparatus 3 as LSI which is typically an integrated circuit. Each functional block of the mobile station device 1 and the base station device 3 may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

1 (1A, 1B, 1C) Mobile station apparatus 3 Base station apparatus 101 Upper layer processing section 103 Control section 105 Reception section 107 Transmission section 109 Channel measurement section 201 Upper layer processing section 203 Control section 205 Reception section 207 Transmission section 209 Channel measurement Unit 1013 scheduling unit 1015 downlink control information generation unit 2013 scheduling unit 2031 transmission signal control unit

Claims (6)

A base station device that communicates with a mobile station device,
A transmitter that transmits downlink data and information indicating radio resources for contention-based signal transmission;
A receiving unit for receiving ACK or NACK for the downlink data and the contention-based signal ;
Whether the mobile station apparatus transmits the ACK or NACK and the contention-based signal simultaneously when the ACK or NACK and the contention-based signal collide in a single uplink time frame A base station apparatus that sets whether to transmit one of them . The base station apparatus according to claim 1, wherein the contention-based signal is received from the mobile station apparatus using a physical uplink shared channel . The base station apparatus according to claim 1 or 2, wherein the ACK or NACK is received from the mobile station apparatus using a physical uplink control channel . A wireless communication method applied to a base station device that communicates with a mobile station device ,
Transmitting downlink data and information indicating radio resources for contention-based signal transmission;
Receiving an ACK or NACK for the downlink data and the contention-based signal;
Whether the mobile station apparatus transmits the ACK or NACK and the contention-based signal simultaneously when the ACK or NACK and the contention-based signal collide in a single uplink time frame , characterized by chromatic and setting whether to transmit either one, the radio communication method. A circuit device definitive base station apparatus for communicating with mobile station apparatus,
A transmission circuit for transmitting downlink data and information indicating radio resources for contention-based signal transmission;
A receiving circuit for receiving the ACK or NACK for the downlink data and the contention-based signal,
Whether the mobile station apparatus transmits the ACK or NACK and the contention-based signal simultaneously when the ACK or NACK and the contention-based signal collide in a single uplink time frame , Set which one to send,
According to the setting, when the ACK or NACK and the contention-based signal collide in a single uplink time frame, the receiving circuit detects the ACK or NACK and the contention-based signal. A circuit device characterized by receiving both at the same time or receiving either one . 6. The circuit device according to claim 5, wherein the circuit device is an integrated circuit in which the receiving circuit and the transmitting circuit are integrated .