WO2010103964A1 - 無線基地局 - Google Patents
無線基地局 Download PDFInfo
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- WO2010103964A1 WO2010103964A1 PCT/JP2010/053399 JP2010053399W WO2010103964A1 WO 2010103964 A1 WO2010103964 A1 WO 2010103964A1 JP 2010053399 W JP2010053399 W JP 2010053399W WO 2010103964 A1 WO2010103964 A1 WO 2010103964A1
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- signal channel
- resource
- phich
- acknowledgment signal
- base station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0016—Time-frequency-code
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
Definitions
- the present invention relates to a radio base station.
- a radio base station eNB transmits to a mobile station UE via a PHICH (Physical Hybrid-ARQ Indicator Channel, a delivery confirmation signal channel).
- the mobile station UE is configured to transmit an acknowledgment signal (ACK / NACK) for an uplink data signal transmitted via a PUSCH (Physical Uplink Shared Channel, uplink data signal channel).
- the present invention has been made in view of the above-described problems, and an object thereof is to provide a radio base station capable of appropriately allocating resources to PHICH.
- a first feature of the present invention is a radio base station, and an uplink data signal channel resource allocation configured to allocate an uplink data signal channel resource to an uplink data signal channel that transmits an uplink data signal of a mobile station And a first frequency direction resource and a first code direction resource are allocated to an acknowledgment signal channel that transmits an acknowledgment signal for the uplink data signal based on identification information of the uplink data signal channel resource.
- An acknowledgment signal channel resource allocation unit, and a notification unit configured to notify the mobile station of the uplink data signal channel resource, the acknowledgment signal channel resource allocation unit includes:
- the usage status of the code direction resource in the first frequency direction resource is a predetermined condition. When satisfying, the frequency direction resource and the code direction resource allocated to the acknowledgment signal channel are changed from the first frequency direction resource and the first code direction resource to the second frequency direction resource and the second code direction resource. It is summarized as follows.
- FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
- FIG. 2 is a functional block diagram of the radio base station according to the first embodiment of the present invention.
- FIG. 3 is a diagram for explaining a PHICH resource allocation method by the radio base station according to the first embodiment of the present invention.
- FIG. 4 is a diagram for explaining the concept of the PHICH group used in the radio base station according to the first embodiment of the present invention.
- FIG. 5 is a diagram for explaining the concept of the PHICH sequence used in the radio base station according to the first embodiment of the present invention.
- FIG. 6 is a diagram for explaining a PHICH resource allocation method by the radio base station according to the first embodiment of the present invention.
- FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
- FIG. 2 is a functional block diagram of the radio base station according to the first embodiment of the present invention.
- FIG. 3 is a diagram for explaining
- FIG. 7 is a diagram for explaining a PHICH resource allocation method by the radio base station according to the first embodiment of the present invention.
- FIG. 8 is a diagram for explaining a PHICH resource allocation method by the radio base station according to the first embodiment of the present invention.
- FIG. 9 is a diagram for explaining a PHICH resource allocation method by the radio base station according to the first embodiment of the present invention.
- FIG. 10 is a flowchart showing an operation of the radio base station according to the first embodiment of the present invention.
- FIG. 11 is a diagram for explaining a PHICH resource allocation method by a radio base station according to Modification 1 of the present invention.
- the mobile communication system according to the present embodiment is an LTE mobile communication system.
- the mobile station UE transmits a radio base station via the PUSCH.
- An uplink data signal is transmitted to the eNB, and the radio base station eNB is configured to transmit an acknowledgment signal (ACK / NACK) for the uplink data signal via the PHICH.
- ACK / NACK acknowledgment signal
- the radio base station eNB is configured to transmit a downlink control signal to the mobile station UE via a PDCCH (Physical Downlink Control Channel).
- PDCCH Physical Downlink Control Channel
- the radio base station eNB includes a PUSCH resource allocation unit 11A, a PHICH resource allocation unit 11B, a PDCCH transmission unit 12, a PUSCH reception unit 13, and a PHICH transmission unit 14.
- the PUSCH resource allocation unit 11A is configured to allocate a PUSCH resource (uplink data signal channel resource) to the PUSCH.
- the PUSCH resource allocation unit 11A is configured to allocate a subframe as a time direction resource and a resource block (RB: Resource Block) as a frequency direction resource to the PUSCH.
- RB Resource Block
- the resource block is composed of 7 ODFM symbols and 12 subcarriers.
- the PHICH resource allocation unit 11B is configured to allocate resources including frequency direction resources and code direction resources to the PHICH.
- the frequency direction resources that can be allocated to PHICH are PHICH groups (acknowledgment signal channel groups) configured by a plurality of resource element groups (for example, three resource element groups).
- a resource element group (REG: Resource Element Group) is composed of four consecutive resource elements (RE: Resource Element).
- the resource element is composed of one OFDM symbol and one subcarrier.
- N PHICH group of PHICH groups is determined by (Equation 1).
- N RB DL is the number of resource blocks in the system bandwidth
- N g is a parameter (for example, 1/6, 1/2, 1, 2) for determining the number of PHICH groups. is there.
- the system bandwidth is "5MHz” when Normal Cyclic Prefix is used, since N RB DL is "25”, when the N g a "1", PHICH number of groups is " 4 ".
- the system bandwidth is "20MHz”, if the Normal Cyclic Prefix is used, since N RB DL is "100”, when the N g and "1/6" is the PHICH group The number is “3”.
- the number of PHICH groups N PHICH group is “3”. In the following, for simplicity of explanation, it is assumed that the number of PHICH groups is “3” as an example.
- the PHICH group is configured to be mapped at almost equal intervals over the entire system bandwidth in order to obtain frequency diversity gain. Yes.
- the code direction resource that can be allocated to PHICH is an orthogonal sequence (for example, Walsh Hadamard sequence) in the PHICH group.
- Such orthogonal sequences can be multiplexed on the I phase and the Q phase within the PHICH group (I / Q multiplexing is possible).
- N SF PHICH PHICH sequences can be multiplexed on each of the I phase and the Q phase in the PHICH group.
- N SF PHICH is as follows.
- a resource (PHICH resource) allocated to PHICH is specified by a PHICH group number that identifies a PHICH group and a PHICH sequence number that identifies a PHICH sequence.
- the PHICH resource allocation unit 11B allocates the first frequency direction resource and the first code direction resource to the PHICH based on the resource block number (identification information of the uplink data signal channel resource) that identifies the resource block in the PUSCH resource. It is configured as follows.
- the PHICH resource allocation unit 11B determines a resource to be allocated to PHICH based on the smallest resource block number (RB index) among resource block numbers that identify resource blocks allocated to the PUSCH as frequency direction resources. .
- the PHICH resource allocating unit 11B has the smallest resource block among resource block numbers # 0 to # 2 for identifying a resource block allocated as a frequency direction resource to the PUSCH of the mobile station UE # 1. Based on the number # 0, a resource to be allocated to the PHICH of the mobile station UE # 1 is determined.
- the PHICH resource allocating unit 11B is based on the smallest resource block number # 3 among resource block numbers # 3 to # 6 that identify resource blocks allocated as frequency direction resources to the PUSCH of the mobile station UE # 2. A resource to be allocated to the PHICH of the mobile station UE # 2 is determined.
- the PHICH resource allocating unit 11B is based on the smallest resource block number # 7 among resource block numbers # 7 to # 11 for identifying resource blocks allocated as frequency direction resources to the PUSCH of the mobile station UE # 3. A resource to be allocated to the PHICH of the mobile station UE # 3 is determined.
- the PHICH resource allocating unit 11B is based on the smallest resource block number # 12 among the resource block numbers # 12 to # 15 that identify resource blocks allocated as frequency direction resources to the PUSCH of the mobile station UE # 4. A resource to be allocated to the PHICH of the mobile station UE # 4 is determined.
- the PHICH resource allocating unit 11B is based on the smallest resource block number # 16 among the resource block numbers # 16 to # 18 for identifying resource blocks allocated as frequency direction resources to the PUSCH of the mobile station UE # 5. A resource to be allocated to the PHICH of the mobile station UE # 5 is determined.
- the PHICH resource allocating unit 11B sends the PHICH of the mobile station UE # 1 to the PHICH group # 0 and PHICH corresponding to the resource block number # 0 as the first frequency direction resource and the first code direction resource. It is configured to assign sequence # 0.
- the PHICH resource allocation unit 11B allocates the PHICH group # 0 and the PHICH sequence # 1 corresponding to the resource block number # 3 as the first frequency direction resource and the first code direction resource to the PHICH of the mobile station UE # 2. It is configured as follows.
- the PHICH resource allocation unit 11B allocates the PHICH group # 1 and the PHICH sequence # 2 corresponding to the resource block number # 7 as the first frequency direction resource and the first code direction resource to the PHICH of the mobile station UE # 3. It is configured as follows.
- the PHICH resource allocation unit 11B allocates the PHICH group # 0 and the PHICH sequence # 4 corresponding to the resource block number # 12 as the first frequency direction resource and the first code direction resource to the PHICH of the mobile station UE # 4. It is configured as follows.
- the PHICH resource allocation unit 11B allocates the PHICH group # 1 and the PHICH sequence # 5 corresponding to the resource block number # 16 as the first frequency direction resource and the first code direction resource to the PHICH of the mobile station UE # 5. It is configured as follows.
- the resources (PHICH group and PHICH sequence) allocated to the PHICH are configured to be determined based on the smallest resource block number among the resource block numbers for identifying the resource blocks allocated to the PUSCH. .
- the resources (PHICH group and PHICH sequence) allocated to PHICH are cyclic shift indexes (Cyclic Shift Index) of “Demodulation Reference Signal” for demodulating the PUSCH signal (uplink data signal) that can be notified via PDCCH. Can be changed.
- the cyclic shift index is “0”.
- the PHICH group number and the PHICH sequence number increase by “n”.
- PHICH group # 0 and PHICH sequence # 0 are assigned to PHICH.
- the PHICH is changed to PHICH.
- Group # 1 and PHICH sequence # 1 are assigned.
- the PHICH group # 2 is assigned to the PHICH.
- PHICH sequence # 5 are assigned.
- the PHICH is changed to PHICH.
- Group # 1 and PHICH sequence # 7 are assigned.
- Such a change in resources allocated to PHICH by cyclic shift is assumed to be used to avoid a situation where one PHICH resource is allocated to a plurality of PHICHs (PHICH resource collision). .
- the resource block number that is the smallest among the resource block numbers that identify the resource blocks assigned to the PUSCH of the mobile station UE # 1 is “0”, and the resource block assigned to the PUSCH of the mobile station UE # 2
- the PHICH group # 0 and the PHICH sequence # are included in both the PHICH of the mobile station UE # 1 and the PHICH of the mobile station UE # 2. Since 0 is assigned, the PHICH resource collision can be avoided by changing the PHICH resource by cyclic shift.
- the PHICH resource allocating unit 11B assigns the PHICH to be allocated to the PHICH by the above-described cyclic shift when the usage status of the PHICH sequence (code direction resource) in the PHICH group (first frequency direction resource) satisfies a predetermined condition.
- the group and PHICH sequence are configured to change from the first frequency direction resource and the first code direction resource to the second frequency direction resource and the second code direction resource.
- the PHICH resource allocating unit 11B performs the above-described processing when the usage status of the PHICH sequence (code direction resource) in the PHICH group # 0 (first frequency direction resource) satisfies a predetermined condition.
- the PHICH sequence in the PHICH group assigned to PHICH by cyclic shift is changed from PHICH sequence # 0 (first code direction resource) in PHICH group # 0 (first frequency direction resource) to PHICH group # 1 (second frequency).
- (Direction resource) may be changed to PHICH sequence # 1 (second code direction resource).
- the PHICH resource allocating unit 11B performs the above-described process when the usage state of the PHICH sequence (code direction resource) in the PHICH group # 2 (first frequency direction resource) satisfies a predetermined condition.
- the PHICH group and the PHICH sequence to be assigned to PHICH by cyclic shift of PHICH group # 2 (first frequency direction resource) and PHICH sequence # 5 (first code direction resource) are changed to PHICH group # 1 (second frequency direction). Resource) and PHICH sequence # 7 (second code direction resource).
- the PHICH resource allocation unit 11B determines the PHICH sequence in the PHICH group to be allocated to the PHICH, Change from the first PHICH sequence (PHICH sequence # 0) in the first PHICH group (for example, PHICH group # 0) to the second PHICH sequence (PHICH sequence # 1) in the second PHICH group (for example, PHICH group # 1). It may be configured.
- the PHICH resource allocation unit 11B determines the PHICH sequence in the PHICH group to be assigned to the PHICH as the first PHICH sequence. Change from a first PHICH sequence (PHICH sequence # 0) in one PHICH group (eg, PHICH group # 0) to a second PHICH sequence (PHICH sequence # 1) in a second PHICH group (eg, PHICH group # 1). It may be configured.
- PHICH resources Allocation unit 11B may be configured to preferentially change the first PHICH sequence in the first PHICH group (for example, PHICH sequence # 0 in PHICH group # 0) that has already been allocated to another PHICH. .
- PHICH resources Allocation unit 11B may be configured to preferentially change the first PHICH sequence in the first PHICH group with the largest number of PHICH sequences used (for example, PHICH sequence # 0 in PHICH group # 0).
- PHICH resources The allocation unit 11B is configured to preferentially change the first PHICH sequence in the first PHICH group in which the PHICH sequence is multiplexed into the I phase and the Q phase (for example, the PHICH sequence # 0 in the PHICH group # 0). It may be.
- PHICH resources may be configured to preferentially change the first PHICH sequence in the first PHICH group having the largest total transmission power (for example, the PHICH sequence # 0 in PHICH group # 0).
- the PHICH resource allocating unit 11B may be configured such that the PHICH group (for example, PHICH group # 1) having the smallest total transmission power is set as the above-described change destination PHICH group (second PHICH group). Good.
- the PHICH resource allocating unit 11B determines that the PHICH group in which I / Q multiplexing of the PHICH sequence occurs when the first PHICH sequence in the first PHICH group is changed is the PHICH group (second PHICH group) that is the change destination described above. It may be configured not to.
- the PHICH resource allocation unit 11B changes the first PHICH sequence in the first PHICH group
- the PHICH group in which a collision with a PHICH sequence that has already been allocated to another PHICH occurs is changed to the above-described PHICH to be changed. It may be configured not to be a group (second PHICH group).
- the PDCCH transmission unit 12 is configured to transmit a downlink control signal to the mobile station UE via the PDCCH.
- the PDCCH transmission unit 12 is configured to transmit an uplink scheduling signal “UL scheduling grant” to the mobile station UE via the PDCCH.
- the PDCCH transmission unit 12 uses the uplink scheduling signal “UL scheduling grant” to the mobile station UE, and the PUSCH resource (for example, subframe and resource block, modulation scheme, encoding) allocated by the PUSCH resource allocation unit 11A. Rate, etc.).
- the PUSCH resource for example, subframe and resource block, modulation scheme, encoding
- the PDCCH transmission unit 12 is configured to notify the mobile station UE of the PHICH group (second frequency direction resource) and the PHICH sequence (second code direction resource) changed by the PHICH resource allocation unit 11B. It may be.
- the PDCCH transmission unit 12 notifies the mobile station UE of the cyclic shift index by the uplink scheduling signal “UL scheduling grant”. It may be configured to.
- the PUSCH receiving unit 13 is configured to receive an uplink data signal transmitted by the mobile station UE via the PUSCH.
- the PHICH transmission unit 14 is configured to transmit an acknowledgment signal (ACK / NACK) for the uplink data signal received by the PUSCH reception unit 13 to the mobile station UE.
- ACK / NACK acknowledgment signal
- the PDCCH transmission unit 12 transmits an uplink scheduling signal “UL scheduling grant” to the mobile station UE via the PDCCH.
- the PHICH transmission unit 14 transmits to the mobile station UE via PHICH. NACK is transmitted.
- the PUSCH receiving unit 13 receives the uplink data signal transmitted by the mobile station UE according to the uplink scheduling signal “UL scheduling grant” via the PUSCH.
- the PHICH transmission unit 14 transmits an acknowledgment signal (ACK / NACK) for the uplink data signal received by the PUSCH reception unit 13 to the mobile station UE via the PHICH.
- ACK / NACK acknowledgment signal
- the PHICH resource allocating unit 11B considers the resource block allocated to the PUSCH for transmitting the uplink data signal transmitted by the mobile station UE in the subframe # n + 4, and transmits the acknowledgment signal in the subframe # n + 8. Determine resources to be allocated to PHICH for transmission.
- PDCCH transmission unit 12 notifies mobile station UE about the cyclic shift index used for determining PHICH resources.
- step S101 the radio base station eNB determines a default cyclic shift index (cyclic shift amount).
- the cyclic shift index n DMRS is “0”, and in the case of retransmission of the uplink data signal
- the cyclic shift index n DMRS is the same as the cyclic shift index n DMRS notified by the latest uplink scheduling signal “UL scheduling grant” of the same HARQ process.
- the radio base station eNB determines the PHICH determined based on the smallest resource block number among the resource block numbers for identifying resource blocks allocated to the PUSCH and the cyclic shift index n DMRS determined in step S101.
- Resources PHICH group and PHICH sequence are allocated to each PHICH.
- step S103 the radio base station eNB checks the number of used PHICH sequences (the number of multiplexing) in each PHICH group, and calculates the average value N tmp of the PHICH sequences used in each PHICH group by (Equation 2). To do.
- N PHICH group is the number of PHICH groups
- N multiplexed is the number of PHICHs to which resources are allocated in the corresponding subframe.
- step S104 the radio base station eNB sets “0” to the flag.
- step S105 the radio base station eNB determines whether or not the condition 1 or the condition 2 is satisfied in the resource allocation control determination condition.
- condition 1 is “a PHICH group in which the number of PHICH sequences used in PHICH is N tmp or more and the number of PHICH sequences in PHICH used is (N tmp ⁇ 2) or less. That there is.
- condition 2 is “At the time of step S101, there is a PHICH group in which a PHICH resource collision has occurred, that is, there is a PHICH group in which the same PHICH sequence is assigned to a plurality of PHICHs. Is.
- step S105 If “YES” in step S105, the operation proceeds to step S106, and if “NO” in step S105, the operation proceeds to step S107.
- step S106 the radio base station eNB sets “1” to the flag.
- step S107 the radio base station eNB determines whether “1” is set in Flag.
- step S107 If “YES” in step S107, the operation proceeds to step S108, and if “NO” in step S107, the operation ends.
- step S108 the radio base station eNB determines the PHICH group to be changed based on the priority order of each PHICH group.
- the priority of the PHICH group in which the collision of the PHICH resource occurs is “1”
- the priority is “2”
- the priority of the PHICH group in which the PHICH sequence is used most frequently and I / Q multiplexing of the PHICH sequence is not performed is “3”.
- the radio base station eNB may set the PHICH group with the largest total transmission power as the PHICH group to be changed.
- the radio base station eNB selects a PHICH group having the smallest PHICH group number.
- the PHICH group to be changed may be used.
- step S109 the radio base station eNB determines a change-target PHICH group.
- the radio base station eNB may set the PHICH group with the smallest number of PHICH sequences used as the change destination PHICH group.
- the radio base station eNB when the radio base station eNB changes the PHICH sequence in the PHICH group to be changed, the radio base station eNB selects a PHICH group in which a collision with a PHICH sequence already assigned to another PHICH (PHICH resource collision) occurs.
- the above-mentioned PHICH group to be changed may not be used.
- the radio base station eNB when changing the PHICH sequence in the PHICH group to be changed, the radio base station eNB does not need to set the PHICH group in which I / Q multiplexing of the PHICH sequence occurs as the above-described change-target PHICH group.
- the radio base station eNB may set the PHICH group with the smallest total transmission power as the change destination PHICH group.
- the radio base station eNB has a PHICH with the smallest PHICH group number.
- the group may be a change destination PHICH group.
- step S110 the radio base station eNB changes one PHICH resource from the change target PHICH group to the change destination PHICH group.
- step S111 the radio base station eNB determines whether or not either of condition 1 or condition 2 is satisfied in the resource allocation control end determination condition.
- condition 1 is “a PHICH group in which the number of PHICH sequences used in PHICH is N tmp or more and the number of PHICH sequences in PHICH used is (N tmp ⁇ 2) or less. And there is a PHICH group that can be the PHICH group to be changed ”.
- Condition 2 indicates that “a PHICH group in which a PHICH resource conflict has occurred, that is, a PHICH group in which the same PHICH sequence is assigned to a plurality of PHICHs, and the PHICH to be changed There is a PHICH group that can be a group.
- step S111 If “YES” in step S111, the operation returns to step S107, and if “NO” in step S111, the operation proceeds to step S112.
- step S112 the radio base station eNB sets “0” to Flag.
- the radio base station eNB in the radio base station eNB, the smallest resource block number and the default cyclic shift among the resource block numbers for identifying resource blocks allocated to the PUSCH.
- the PHICH resource determined based on the index by cyclic shift By changing the PHICH resource determined based on the index by cyclic shift, the above-described collision of PHICH resources can be avoided.
- the PHICH sequence when a large number of PHICH sequences are used in each PHICH group in the radio base station eNB, resource blocks allocated to the PUSCH By changing the PHICH resource determined based on the smallest resource block number among the resource block numbers and the default cyclic shift index by cyclic shift, the PHICH sequence is multiplexed using orthogonal codes. The amount of interference between codes can be reduced within a PHICH group.
- the mobile communication system when a large number of PHICH sequences are used in each PHICH group in the radio base station eNB, resource blocks allocated to the PUSCH By changing the PHICH resource determined based on the smallest resource block number of the resource block numbers and the default cyclic shift index by cyclic shift, the transmission power in the resource element is changed within a specified range. Can fit inside.
- the resource block assigned to the PUSCH is identified.
- the I-phase is changed to the Q-phase, or the Q-phase is changed.
- the influence of interference due to the disruption of the orthogonality from the I phase to the I phase can be reduced.
- Modification 1 In the mobile communication system according to the first modification, as shown in FIG. 11, the “hopping technique” for changing PUSCH resources (that is, resource blocks) used for retransmission of uplink data signals at each retransmission timing is applied. May be.
- a resource block used for retransmission of an uplink data signal is changed according to a predetermined change pattern, or used for retransmission of an uplink data signal when transmitting an uplink scheduling signal “UL scheduling grant”.
- a method for notifying a change pattern of a resource block is known.
- the PHICH resource allocation unit 11B changes based on the resource block number for identifying the resource block in the PUSCH resource used for retransmission of the uplink data signal, that is, for each retransmission timing.
- the second frequency direction resource and The second code direction resource is configured to be allocated.
- the PHICH resource allocation unit 11B does not consider only the resource block allocated to the PUSCH transmitted in the subframe # n + 8 when determining the PHICH transmission resource in the subframe #n. In consideration of the smallest resource block number among the resource block numbers for identifying the resource blocks assigned to the PUSCH transmitted in subframes # n + 16, # n + 24,. decide.
- the probability that a PHICH resource collision will occur increases when the number of retransmissions of the uplink data signal by the mobile station UE increases, but the processing load on the mobile station UE decreases.
- the processing load in the radio base station eNB and the probability of occurrence of a PHICH resource collision are in a trade-off relationship.
- the first feature of the present embodiment is a radio base station eNB, which allocates a PUSCH resource (uplink data signal channel resource) to a PUSCH (uplink data signal channel) that transmits an uplink data signal of the mobile station UE.
- a PUSCH resource uplink data signal channel resource
- PUSCH uplink data signal channel
- PHICH delivery confirmation
- a PHICH resource allocating unit 11B configured to allocate the first frequency direction resource and the first code direction resource to the signal channel
- a PUSCH resource for example, a subframe and a resource block
- the PHICH resource allocation unit 11B includes a frequency direction resource and a code allocated to the PHICH when the usage status of the code direction resource in the first frequency direction resource satisfies a predetermined condition.
- the gist is that the direction resource is configured to be changed from the first frequency direction resource and the first code direction resource to the second frequency direction resource and the second code direction resource.
- the PDCCH transmission unit 12 may be configured to notify the mobile station UE of the second frequency direction resource and the second code direction resource.
- the frequency direction resource that can be allocated to PHICH is a PHICH group (acknowledgment signal channel group) configured by a plurality of resource element groups, and the code direction resource that can be allocated to PHICH.
- PHICH group acknowledgeledgment signal channel group
- the code direction resource that can be allocated to PHICH Is an orthogonal sequence (for example, Walsh Hadamard sequence) in the PHICH group, and the PHICH resource allocating unit 11B makes the PHICH send the first in the first PHICH group based on the resource block number identifying the resource block in the PUSCH resource.
- the PHICH resource allocating unit 11B is configured to allocate an orthogonal sequence, and the PHICH resource allocating unit 11B is configured to perform PHICH when the usage status of the orthogonal sequence in the first PHICH group satisfies a predetermined condition.
- the orthogonal sequences PHICH group to be assigned to, the first orthogonal sequence in the first 1PHICH group, may be configured to change the second orthogonal sequence in the 2PHICH group.
- the PHICH resource allocation unit 11B when the number of orthogonal sequences used in the first PHICH group is equal to or greater than a predetermined number, the PHICH resource allocation unit 11B changes the PHICH group and orthogonal sequence allocated to the PHICH. It may be configured.
- the PHICH resource allocation unit 11B changes the PHICH group and orthogonal sequence allocated to the PHICH. It may be configured to.
- the PHICH resource allocating unit 11B when there are a plurality of first orthogonal sequences in the first PHICH group to be changed, the PHICH resource allocating unit 11B includes the first PHICH group in the first PHICH group that has already been allocated to another PHICH.
- One orthogonal sequence may be preferentially changed.
- the PHICH resource allocation unit 11B uses the first PHICH group in the first PHICH group with the largest number of orthogonal sequences used. You may be comprised so that an orthogonal sequence may be changed preferentially.
- orthogonal sequences can be multiplexed in the I-phase and Q-phase within the PHICH group, and when there are a plurality of first orthogonal sequences in the first PHICH group to be changed, PHICH resource allocation
- the unit 11B may be configured to preferentially change the first orthogonal sequence in the first PHICH group in which the orthogonal sequences are multiplexed in the I phase and the Q phase.
- the PHICH resource allocation unit when there are a plurality of first orthogonal sequences in the first PHICH group to be changed, the PHICH resource allocation unit performs the first orthogonal in the first PHICH group having the largest total transmission power.
- the sequence may be preferentially changed.
- the PHICH resource allocation unit 11B may be configured such that the PHICH group with the smallest total transmission power is the second PHICH group.
- the PHICH resource allocating unit 11B selects a PHICH group in which multiplexing of the orthogonal sequence into the I phase and the Q phase occurs when the first orthogonal sequence in the first PHICH group is changed.
- the second PHICH group may not be configured.
- the PHICH resource allocation unit 11B causes a collision with an orthogonal sequence that has already been allocated to another PHICH when the first orthogonal sequence in the first PHICH group is changed.
- the group may be configured not to be the second PHICH group.
- the PHICH resource allocating unit 11B receives an acknowledgment signal for the retransmitted uplink data signal based on the resource block number for identifying the resource block in the PUSCH resource used for retransmission of the uplink data signal. May be configured to allocate the first frequency direction resource and the first code direction resource to the PHICH that transmits.
- radio base station eNB and the mobile station UE described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both. .
- Software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, and Hard Disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.
- Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the radio base station eNB or the mobile station UE. Further, the storage medium and the processor may be provided as a discrete component in the radio base station eNB or the mobile station UE.
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Abstract
Description
図1乃至図9を参照して、本発明の第1の実施形態に係る移動通信システムの構成について説明する。
以下、図10を参照して、本実施形態に係る移動通信システムの動作について、具体的には、本実施形態に係る無線基地局eNBの動作について説明する。
本発明の第1の実施形態に係る移動通信システムによれば、無線基地局eNBにおいて、PUSCHに割り当てられたリソースブロックを識別するリソースブロック番号のうちの最も小さいリソースブロック番号及びデフォルトのサイクリックシフトインデックスに基づいて決定されたPHICHリソースを、サイクリックシフトによって変更することによって、上述のPHICHリソースの衝突を回避することができる。
本変更例1に係る移動通信システムでは、図11に示すように、上りデータ信号の再送に用いられるPUSCHリソース(すなわち、リソースブロック)は、再送タイミングごとに変更する「ホッピング技術」が適用されていてもよい。
Claims (13)
- 移動局の上りデータ信号を送信する上りデータ信号チャネルに、上りデータ信号チャネルリソースを割り当てるように構成されている上りデータ信号チャネルリソース割当部と、
前記上りデータ信号チャネルリソースの識別情報に基づいて、前記上りデータ信号に対する送達確認信号を送信する送達確認信号チャネルに、第1周波数方向リソース及び第1コード方向リソースを割り当てるように構成されている送達確認信号チャネルリソース割当部と、
前記移動局に対して、前記上りデータ信号チャネルリソースを通知するように構成されている通知部とを具備し、
前記送達確認信号チャネルリソース割当部は、前記第1周波数方向リソースにおけるコード方向リソースの使用状況が、所定条件を満たす場合に、前記送達確認信号チャネルに割り当てる周波数方向リソース及びコード方向リソースを、前記第1周波数方向リソース及び前記第1コード方向リソースから、第2周波数方向リソース及び第2コード方向リソースに変更するように構成されていることを特徴とする無線基地局。 - 前記通知部は、前記移動局に対して、前記第2周波数方向リソース及び前記第2コード方向リソースを通知するように構成されていることを特徴とする請求項1に記載の無線基地局。
- 前記送達確認信号チャネルに割り当て可能な周波数方向リソースは、複数のリソースエレメントグループによって構成されている送達確認信号チャネルグループであり、
前記送達確認信号チャネルに割り当て可能なコード方向リソースは、前記送達確認信号チャネルグループ内の直交シーケンスであり、
前記送達確認信号チャネルリソース割当部は、前記上りデータ信号チャネルリソースの識別情報に基づいて、前記送達確認信号チャネルに、第1送達確認信号チャネルグループ内の第1直交シーケンスを割り当てるように構成されており、
前記送達確認信号チャネルリソース割当部は、前記第1送達確認信号チャネルグループ内の直交シーケンスの使用状況が、所定条件を満たす場合に、前記送達確認信号チャネルに割り当てる送達確認信号チャネルグループ内の直交シーケンスを、前記第1送達確認信号チャネルグループ内の第1直交シーケンスから、第2送達確認信号チャネルグループ内の第2直交シーケンスに変更するように構成されていることを特徴とする請求項1又は2に記載の無線基地局。 - 前記第1送達確認信号チャネルグループ内の直交シーケンスの使用数が、所定数以上となった場合に、前記送達確認信号チャネルリソース割当部は、前記送達確認信号チャネルに割り当てる送達確認信号チャネルグループ及び直交シーケンスを変更するように構成されていることを特徴とする請求項3に記載の無線基地局。
- 前記第1送達確認信号チャネルグループ内の前記第1直交シーケンスが、既に他の送達確認信号チャネルに割り当てられている場合に、前記送達確認信号チャネルリソース割当部は、前記送達確認信号チャネルに割り当てる送達確認信号チャネルグループ及び直交シーケンスを変更するように構成されていることを特徴とする請求項3に記載の無線基地局。
- 変更対象の第1送達確認信号チャネルグループ内の第1直交シーケンスが複数存在する場合、前記送達確認信号チャネルリソース割当部は、既に他の送達確認信号チャネルに割り当てられている第1送達確認信号チャネルグループ内の第1直交シーケンスを優先的に変更するように構成されていることを特徴とする請求項3に記載の無線基地局。
- 変更対象の第1送達確認信号チャネルグループ内の第1直交シーケンスが複数存在する場合、前記送達確認信号チャネルリソース割当部は、直交シーケンスの使用数が最も多い第1送達確認信号チャネルグループ内の第1直交シーケンスを優先的に変更するように構成されていることを特徴とする請求項3に記載の無線基地局。
- 前記直交シーケンスは、前記送達確認信号チャネルグループ内でI相及びQ相に多重可能であり、
変更対象の第1送達確認信号チャネルグループ内の第1直交シーケンスが複数存在する場合、前記送達確認信号チャネルリソース割当部は、直交シーケンスがI相及びQ相に多重されている第1送達確認信号チャネルグループ内の第1直交シーケンスを優先的に変更するように構成されていることを特徴とする請求項3に記載の無線基地局。 - 変更対象の第1送達確認信号チャネルグループ内の第1直交シーケンスが複数存在する場合、前記送達確認信号チャネルリソース割当部は、送信電力の合計値が最も大きい第1送達確認信号チャネルグループ内の第1直交シーケンスを優先的に変更するように構成されていることを特徴とする請求項3に記載の無線基地局。
- 前記送達確認信号チャネルリソース割当部は、送信電力の合計値が最も小さい送達確認信号チャネルグループを、前記第2送達確認信号チャネルグループとするように構成されていることを特徴とする請求項3に記載の無線基地局。
- 前記送達確認信号チャネルリソース割当部は、前記第1送達確認信号チャネルグループ内の前記第1直交シーケンスを変更した場合に、直交シーケンスのI相及びQ相への多重が発生する送達確認信号チャネルグループを、前記第2送達確認信号チャネルグループとしないように構成されていることを特徴とする請求項3に記載の無線基地局。
- 前記送達確認信号チャネルリソース割当部は、前記第1送達確認信号チャネルグループ内の前記第1直交シーケンスを変更した場合に、既に他の送達確認信号チャネルに割り当てられている直交シーケンスへの衝突が発生する送達確認信号チャネルグループを、前記第2送達確認信号チャネルグループとしないように構成されていることを特徴とする請求項3に記載の無線基地局。
- 送達確認信号チャネルリソース割当部は、前記上りデータ信号の再送に用いられる前記上りデータ信号チャネルリソースの識別情報に基づいて、再送された該上りデータ信号に対する送達確認信号を送信する送達確認信号チャネルに、前記第1周波数方向リソース及び前記第1コード方向リソースを割り当てるように構成されていることを特徴とする請求項1乃至12のいずれか一項に記載の無線基地局。
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