WO2009116489A1 - 無線通信システム、基地局、リソースブロック割当方法及びプログラム - Google Patents
無線通信システム、基地局、リソースブロック割当方法及びプログラム Download PDFInfo
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- WO2009116489A1 WO2009116489A1 PCT/JP2009/055031 JP2009055031W WO2009116489A1 WO 2009116489 A1 WO2009116489 A1 WO 2009116489A1 JP 2009055031 W JP2009055031 W JP 2009055031W WO 2009116489 A1 WO2009116489 A1 WO 2009116489A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
Definitions
- the present invention relates to a wireless communication technique, and more particularly to a resource block allocation technique in wireless communication.
- a base station In a wireless communication system, a base station (Base Station: BS) communicates with a plurality of mobile stations (User Equipment: UE) using various multiple access methods. Multiple access methods include code division multiple access (Code Multiplexing Access: CDMA) that is divided and accessed by code, frequency division multiplex access (Frequency Division Multiplexing Access: FDMA) that is divided and accessed by frequency, and access that is divided by time. It is classified according to time division multiplex access (Time Division Multiplexing Access: TDMA) and resources to be divided.
- CDMA code division multiple access
- FDMA Frequency Division Multiplexing Access
- TDMA Time Division Multiplexing Access
- the FDMA system is attracting a great deal of attention because it is effective for high-speed data transmission over wireless channels.
- orthogonal frequency division multiplexing Orthogonal Frequency Division Multiplexing
- LTE Long Term Evolution
- SC-FDMA single-carrier
- Non-patent Document 2 In such a system that communicates using the FDMA system, orthogonal frequencies are used to transmit data to different users, thereby suppressing interference between users.
- mobile stations are in various communication states depending on various environments. Flexible allocation of radio communication resources is important for obtaining a multi-user diversity effect. Therefore, flexible allocation of radio communication resources by the base station is effective for obtaining high throughput in the FDMA scheme (Non-patent Document 2).
- a subcarrier group that is continuous on the frequency axis in one slot forms one resource block (RB). If the bandwidth of the resource block is smaller than the coherent bandwidth of the channel, the frequency response of the channel of one resource block can be considered constant.
- Non-patent Document 3 a large multi-diversity effect can be obtained by allocating a resource block having a good channel state to the mobile station. As a result, high throughput can be realized. The method is described below.
- each mobile station transmits a reference signal, and the base station measures channel quality (Channel quality indicator: CQI) using the transmitted reference signal and inputs it to the scheduler unit.
- CQI channel quality indicator
- Non-Patent Document 2 describes that the multi-diversity effect is increased by performing channel-dependent channel-dependent scheduling. However, there is no description of how to allocate to the mobile station UE when the frequency block is limited to a plurality.
- 3GPP TR 25.814 (V7.1.0), “Physical layer aspects for evolved Universal Terrestrial Radio Access (UTRA),” http://www.3gpp.org/ftp/Specs/archive/25_series/25.814/. W. Rhee and J. M. Cioffi, “Increase in capacity of multi user OFDM system using dynamic subchannel allocation,” Proc. IEEE VTC'00, Tokyo, Japan, May 2000, pp. 1085 (1089. NEC Group, R1-071507, “DL unicast resource allocation signaling,” 3GPP TSG-RAN WG1 Meeting # 48bis, St. Julian's, Malta, 26-30 March 2007.
- a problem to be solved by the present invention is to provide a resource block allocation method considering a trade-off between overhead due to multiuser diversity effect and scheduling information.
- the present invention for solving the above problem is a wireless communication system, in which ranking means for ranking mobile stations for each resource block based on a channel state, and at least one resource block on the frequency axis are continuous. And allocating means for allocating the resource blocks to the mobile stations based on the ranking of the mobile stations so that the number of the resource block groups for one mobile station is equal to or less than the set number.
- the present invention for solving the above-mentioned problems is a base station, wherein ranking means for ranking mobile stations for each resource block based on channel conditions and at least one resource block on the frequency axis are continuous. And allocating means for allocating the resource blocks to the mobile stations based on the ranking of the mobile stations so that the number of the resource block groups for one mobile station is equal to or less than the set number.
- the present invention for solving the above-described problem is a resource block allocation method, wherein the number of resource block groups each including one or more resource blocks continuously on the frequency axis is equal to or less than a set number.
- the resource block is allocated to the mobile station based on the information that ranks the mobile station for each resource block according to the channel state.
- the present invention for solving the above-described problem is a program for a base station, wherein the program is provided for one mobile station in a resource block group in which at least one resource block is continuously arranged on the frequency axis.
- a process of allocating resource blocks to mobile stations is executed based on information that ranks mobile stations for each resource block according to a channel state so that the number is equal to or less than a set number.
- the base station BS does not allocate frequency blocks excessively to the mobile station UE. That is, since an appropriate number of frequency blocks is allocated to the mobile station UE by the base station, an increase in overhead due to scheduling information can be prevented.
- FIG. 1 is a diagram for explaining a mobile station system.
- FIG. 2 is a diagram illustrating an example of a mobile station and a base station in the present invention.
- FIG. 3 is a diagram for explaining resource block allocation.
- FIG. 4 is a flow when the maximum number of frequency blocks to be allocated to the mobile station is not set.
- FIG. 5 is a flow for explaining the operation of the first embodiment.
- FIG. 6 is a flow for explaining the operation of the second embodiment.
- FIG. 7 is a diagram for explaining the update processing according to the first embodiment.
- FIG. 8 is a diagram for explaining the update processing according to the second embodiment.
- FIG. 9 is a table showing an example of ranking.
- BS base station
- UE Mobile station
- the present invention is a scheduling technique in wireless communication using a frequency division multiplexing access (FDMA) scheme.
- FDMA frequency division multiplexing access
- FIG. 1 is a diagram showing a wireless communication system 100 according to the present invention.
- the base station (Base Station: BS) 101 accommodates a plurality of mobile stations (UE-A 102, UE-B 103, and UE-C 104 ).
- the base station and the mobile station communicate using an SC-FDMA (single carrier-frequency division) multiplexing (OFDM) method or an OFDM (orthogonal frequency division multiplexing) method.
- SC-FDMA single carrier-frequency division
- OFDM orthogonal frequency division multiplexing
- Base station BS 101 uses UE-A 102, UE-B UB 103, and UB-C 104 uplink (from UE to BS) and downlink (from BS to UE) resource blocks for data communication with the mobile station. Assign.
- This base station applies channel-dependent frequency scheduling in the Long Term Evolution (LTE) of the 3rd Generation Partnership Project (3GPP), and on the frequency axis within one transmission time interval (TTI).
- TTI transmission time interval
- One or a plurality of frequency blocks composed of continuous resource blocks (resource blocks: composed of a plurality of subcarriers) are allocated per mobile station. At this time, the base station presets the number of frequency blocks to be allocated to the same user within the same TTI, and allocates resource blocks so as not to exceed the number of frequency blocks.
- FIG. 3 shows an example in which a total of 80 subcarriers in the system band are divided into 10 resource blocks by 8 consecutive subcarriers and 3 mobile stations are scheduled within 1 TTI.
- UE A (101) is assigned three frequency blocks
- UE B (103) is assigned two frequency blocks
- UE C (104) is assigned one frequency block.
- FIG. 2 is a block diagram showing an example of the configuration of the base station BS and the mobile station UE.
- the frequency demapping unit 212 outputs, for example, a reference signal from the mobile station received by the receiving unit 211 for each user. Similarly, when the data signal is transmitted, the reception unit 211 receives the data signal, and the frequency demapping unit 212 separates the uplink (UPLINK) data 213 of each user according to the result of the BS scheduler 218.
- UPLINK uplink
- the CQI (Channel Quality Indicator) measuring unit 214 measures CQI (Channel Quality Indicator) of all resource blocks in the uplink (frequency band corresponding to each resource block) from the separated reference signal.
- the BS scheduler 218 performs scheduling for allocating resource blocks to mobile stations. For example, on the basis of the uplink CQI indicating the channel state of each mobile station, the mobile stations are ranked in the order of the mobile station having the good channel state for each resource block. Next, the resource block having the best channel state is selected, and the selected resource block is assigned to the mobile station having the best channel state in the resource block. Then, it is determined whether or not the number of frequency blocks currently allocated to the mobile station to which the resource block is allocated exceeds the maximum number of frequency blocks. If the number of frequency blocks exceeds the maximum number of frequency blocks, the BS scheduler 218 performs update processing described later, and if not exceeded, ends the UE setting step as described later. The maximum number of frequency blocks may be set in advance in the scheduler at the time of factory shipment, or may be set or updated as appropriate at the time of installation or after installation.
- the downlink control signal is generated in the downlink control signal generation unit 215 based on the allocation result in the scheduler 218, the mapping process is performed in the frequency mapping unit 216, and is transmitted via the transmission unit 217.
- the mobile station sets the resource block used for transmission according to the downlink control signal received from the base station.
- the mobile station generates a reference signal 221 in accordance with the notification from the base station in order to notify the uplink CQI.
- the generated reference signal is mapped to the frequency band determined for each user by the frequency mapping unit 223, and transmitted to the base station via the transmission unit 224.
- the frequency mapping unit 223 when transmitting the uplink (UPLINK) data signal 222 to the base station, the frequency mapping unit 223 performs resource block mapping according to the downlink control signal received from the base station, and transmits the resource block mapping to the base station via the transmission unit 224.
- the downlink control signal and the downlink data signal transmitted from the base station are received by the reception unit 225, and the downlink control signal is extracted by the frequency demapping unit 226.
- uplink data transmission has been described, but the same applies to downlink.
- scheduling is performed based on the downlink CQI notified by the uplink control signal.
- the scheduling method of the BS scheduler when the maximum number of frequency blocks to be allocated to the mobile station is not set will be described below with reference to FIG.
- the BS scheduler allocates resource blocks to the mobile station having the best CQI.
- the BS scheduler 218 orders (ranks) mobile stations according to the channel state of all mobile stations for each resource block (step 401).
- the mobile station UE having a good (preferably best) channel state is searched from each resource block by the BS scheduler (step 402).
- a mobile station with the best channel state is selected for each resource block (step 403).
- the BS scheduler allocates resource blocks to the mobile station selected in step 403 (step 405).
- step 406 After the resource block assignment, check whether all resource blocks have been assigned to the mobile station. If all resource blocks have been allocated, the process ends. If not allocated, the process returns to step 403 to allocate a resource block that has not been allocated to the mobile station (step 406).
- the BS scheduler allocates frequency blocks to the mobile station UE according to the channel state of the mobile station in each reported resource block.
- the BS scheduler ranks each resource block in the order of good channel state based on the channel state of the mobile station (step 401).
- the BS scheduler selects a resource block having a good (preferably best) channel state (step 404).
- the best CQI resource block is selected from the CQIs of all resource blocks notified from all mobile stations. Note that an average value of the CQI notified by the mobile station may be calculated for each resource block, and a resource block having a high average value may be selected.
- the scheduler allocates the selected resource block to a mobile station having a good channel condition (preferably best) in the resource block (step 501).
- step 502 It is determined whether or not the number of frequency blocks allocated to the mobile station exceeds the maximum number of frequency blocks (step 502). If the number of frequency blocks exceeds the maximum number of frequency blocks (Yes), the scheduler performs an update process (step 503). If not exceeded (No), the UE setting step is terminated and a process of allocating resource blocks is performed (step) 405). It is confirmed whether all resource blocks have been allocated (step 406). If not allocated, the process returns to step 404, and if allocated, the process ends.
- the update process step 503 will be described.
- a mobile station having a good (preferably best) channel state in an adjacent resource block adjacent to a resource block to be allocated is set as a candidate for allocation.
- the mobile station Since a resource block cannot be assigned to the mobile station, the mobile station is removed from the ranking.
- a mobile station (lower mobile station) having the next best channel state after that mobile station is set as an allocation candidate.
- the resource block is assigned to the mobile station assigned to the adjacent resource block. If adjacent resource blocks on both sides are already assigned, the mobile station assigned to the adjacent resource block having the best channel state is set as a candidate to be assigned. (4) The scheduler checks whether there is an adjacent resource block having a CQI lower than the CQI of the resource block to be allocated. In some cases (if both neighbors are lower, the one with the lower CQI), replace the mobile station that is currently set to have the best channel state in its adjacent resource block with the mobile station that it is trying to allocate When resource blocks are allocated, it is confirmed whether the resource block group can be generated without the number of frequency blocks of the mobile station exceeding the maximum number of frequency blocks.
- the resource block to be assigned is assigned as a candidate for assigning a mobile station having the next best channel state after that mobile station.
- the notified resource block information is extracted by the mapping unit 226 by frequency, and the frequency mapping unit 223 transmits uplink data according to the extracted resource block information.
- resource blocks are allocated to mobile stations in order from the best resource block.
- the BS scheduler of the present invention allocates resource blocks so that the number of frequency blocks allocated to each mobile station does not exceed the maximum number of frequency blocks. Can be prevented.
- the scheduler ranks the mobile stations for each resource block based on the channel state in the order of good channel state (step 401).
- a mobile station having a good channel condition (preferably the best) is selected (step 601). Then, among the resource blocks ranked in step 401, all resource blocks in which this mobile station is in a good (preferably best) channel state are candidates for assignment to this mobile station (step 602).
- the candidate resource block constitutes a plurality of frequency blocks, and it is determined whether or not the number of candidate frequency blocks exceeds the maximum number of frequency blocks (step 603).
- the scheduler performs update processing 604, and when it does not exceed (NO), the UE setting step is ended and processing for allocating resource blocks is performed (step 605). It is confirmed whether all mobile stations UE have been assigned (step 606). If not assigned, the process returns to step 601, and if assigned, the process ends.
- the frequency blocks that are candidates to be currently assigned to the mobile station are ranked in the order in which the average channel state of the frequency blocks is favorable.
- the candidate frequency blocks up to the maximum number of frequency blocks, frequency blocks having a good average channel state are selected and assigned to the mobile station.
- the resource block belonging to the frequency block that has not been assigned is subjected to any of the following processes. (1) A mobile station having a good (preferably best) channel state is set as a candidate to be assigned in a resource block adjacent to a resource block that has not been selected. (2) In a resource block that has not been selected, a mobile station having the next best channel state after that mobile station is set as an allocation candidate.
- a resource block group is generated by exchanging a mobile station that is currently set to have a good (preferably best) channel state in the resource block with a mobile station to be allocated. Check if you can. If it can be generated, it is exchanged. If it cannot be generated, it is confirmed whether a resource block group can be generated when the resource block to be allocated is exchanged with a mobile station having the next best channel state after that mobile station. On the other hand, when there is no adjacent resource block having a CQI lower than the CQI of the resource block that has not been selected, as a candidate for assigning a mobile station having the next best channel state after that mobile station in the resource block that has not been selected Set.
- the base station performs ranking based on the uplink CQI.
- the base station may perform ranking based on the downlink CQI. good.
- the mobile station measures the downlink CQI using the downlink reference signal, and transmits an uplink control signal describing the measured downlink CQI to the base station.
- resource blocks are allocated in order from the mobile station with the best CQI.
- the resource blocks are ordered based on predetermined conditions such as ordering according to the mobile station class defined by the number of antennas of the mobile station. You may allocate from a mobile station.
- the BS scheduler of the present invention allocates resource blocks so that the number of frequency blocks allocated to each mobile station does not exceed the maximum number of frequency blocks, it is possible to prevent an increase in overhead due to scheduling information. . Further, when applied to SC-FDMA, an increase in PAPR accompanying an increase in the number of frequency blocks can be prevented.
- the base station performs ranking based on the uplink CQI.
- the base station may perform ranking based on the downlink CQI. good.
- the mobile station measures the downlink CQI using the downlink reference signal, and transmits an uplink control signal describing the measured downlink CQI to the base station.
- resource blocks are allocated in order from the mobile station with the best CQI.
- the resource blocks are ordered based on predetermined conditions such as ordering according to the mobile station class defined by the number of antennas of the mobile station. You may allocate from a mobile station.
- FIG. 9 is a table in which the CQI of each mobile station is ranked for each resource block.
- (A) of FIG. 7 is an example in the case of (1) described in the update process of the first embodiment.
- each resource block sets the mobile station UE having the highest CQI as a candidate.
- mobile station UE A is a candidate to which resource blocks RB 2, 4 and 7 are assigned
- mobile station UE B is a candidate to which resource blocks RB 3, 6 and 8 are assigned
- mobile station UE C Is a candidate to which resource blocks RB 1 and 5 are allocated. Note that the numbers following the UE numbers in each resource block in the figure indicate the ranks of the CQIs.
- RB 4 having the highest CQI is allocated to mobile station UE A.
- the second CQI, RB 5 is assigned to the mobile station UE ⁇ ⁇ C
- the third CQI, RB3, and the fourth CQI, RB6, are sequentially assigned to the mobile station UE B.
- Stations UE A and C are temporarily assigned one frequency resource block, and mobile station UE B is temporarily assigned two frequency blocks.
- UE B is tentatively assigned to RB 8 which is the fifth CQI
- mobile station UE B will be assigned three frequency blocks (RB 3, 6 and 8). Then, the maximum frequency block number “2” is exceeded. Accordingly, the mobile station UE A scheduled to be assigned to the adjacent resource block RB7 of RB 8 is set to be temporarily assigned to RB8.
- RB7 as the sixth CQI is assigned to the mobile station UE ⁇ A
- RB1 as the seventh CQI is assigned to the mobile station UE C.
- RB 2 which is the eighth CQI
- mobile station UE A is assigned three frequency blocks (RB 2, 4, and 7). Then, the maximum frequency block number “2” is exceeded. Accordingly, the mobile station assigned to the RB with the good CQI in the adjacent resource block of RB 2 is set to be assigned to RB2. In this case, the mobile station UE B assigned to RB3 is assigned.
- (B) of FIG. 7 is an example in the case of (2) described in the update process of the first embodiment.
- each resource block sets the mobile station UE having the highest CQI as a candidate.
- mobile station UE A is a candidate to which resource blocks RB 2, 4 and 7 are assigned
- mobile station UE B is a candidate to which resource blocks RB 3, 6 and 8 are assigned
- mobile station UE C Is a candidate to which resource blocks RB 1 and 5 are allocated.
- the second CQI, RB 5 is assigned to the mobile station UE ⁇ ⁇ C
- the third CQI, RB3, and the fourth CQI, RB6, are sequentially assigned to the mobile station UE B.
- Stations UE A and C are temporarily assigned one frequency resource block, and mobile station UE B is temporarily assigned two frequency blocks.
- RB 8 which is the fifth CQI
- mobile station UE B will be assigned three frequency blocks (RB 3, 6 and 8). Then, the maximum frequency block number “2” is exceeded. Therefore, in RB 8, a setting is made to temporarily assign UE C having the best CQI after UE A to RB 8.
- RB7 as the sixth CQI is assigned to the mobile station UE ⁇ A
- RB1 as the seventh CQI is assigned to the mobile station UE C.
- RB 2 which is the eighth CQI
- mobile station UE A is assigned three frequency blocks (RB 2, 4, and 7). Then, the maximum frequency block number “2” is exceeded. Therefore, in RB 2, a setting is made to temporarily assign UE C having the best CQI after UE A to RB 2. In this case, the mobile station UE C is set to be assigned temporarily.
- RB2 which is the ninth CQI, is allocated to the mobile station UE C.
- RB8 which is the 10th CQI
- the mobile station UE ⁇ ⁇ ⁇ C is assigned three frequency blocks (RB 1, 5, and 8). Then, the maximum frequency block number “2” is exceeded. Therefore, in RB 8, UE A having the second best CQI after UE C is assigned to RB8.
- (C) of FIG. 7 is an example in the case of (3) described in the update process of the first embodiment.
- each resource block sets the mobile station UE having the highest CQI as a candidate.
- mobile station UE ⁇ A is a candidate to which resource blocks RB 2, 4 and 7 are assigned
- mobile station UE B is a candidate to which resource blocks RB 3, 6 and 8 are assigned
- mobile station UE C Is a candidate to which resource blocks RB 1 and 5 are allocated. Note that the numbers following the UE numbers in each resource block in the figure indicate the ranks of the CQIs.
- the second CQI, RB 5 is assigned to the mobile station UE ⁇ ⁇ C
- the third CQI, RB3, and the fourth CQI, RB6, are sequentially assigned to the mobile station UE B.
- Stations UE A and C are temporarily assigned one frequency resource block, and mobile station UE B is temporarily assigned two frequency blocks.
- UE B is tentatively assigned to RB 8 which is the fifth CQI
- mobile station UE B will be assigned three frequency blocks (RB 3, 6 and 8). Then, the maximum frequency block number “2” is exceeded. Therefore, it is confirmed whether the adjacent resource block RB7 of RB 8 has already been allocated. In this case, since it has not been assigned yet, the mobile station UE C having the next best CQI after UE B in RB8 is set to be temporarily assigned to RB8.
- RB7 as the sixth CQI is assigned to the mobile station UE ⁇ A
- RB1 as the seventh CQI is assigned to the mobile station UE C.
- RB 2 which is the eighth CQI
- mobile station UE A is assigned three frequency blocks (RB 2, 4, and 7). Then, the maximum frequency block number “2” is exceeded. Therefore, it is confirmed whether the adjacent resource block of RB 2 is already allocated. In this case, since both neighbors are allocated, the mobile station UE B allocated to RB3 having good CQI is allocated.
- mobile station UE C is assigned three frequency blocks (RB 1, 5, and 8). Then, the maximum frequency block number “2” is exceeded. Therefore, it is confirmed whether the adjacent resource block of RB 8 is already allocated. In this case, the mobile station UE A assigned to RB7 is assigned.
- (D) of FIG. 7 is an Example in the case of (4) described in the update process of the first embodiment.
- each resource block sets the mobile station UE having the highest CQI as a candidate.
- the mobile station UE A is a candidate to which resource blocks RB 2, 4 and 7 are assigned
- the mobile station UE B is a candidate to which resource blocks RB 3, 6 and 8 are assigned
- the mobile station UE C Is a candidate to which resource blocks RB 1 and 5 are allocated. Note that the numbers following the UE numbers in each resource block in the figure indicate the ranks of the CQIs.
- RB 4 having the highest CQI is allocated to mobile station UE A.
- the second CQI, RB 5 is assigned to the mobile station UE ⁇ ⁇ C
- the third CQI, RB3, and the fourth CQI, RB6, are sequentially assigned to the mobile station UE B.
- Stations UE A and C are temporarily assigned one frequency resource block, and mobile station UE B is temporarily assigned two frequency blocks.
- RB 8 which is the fifth CQI
- mobile station UE B will be assigned three frequency blocks (RB 3, 6 and 8). Then, the maximum frequency block number “2” is exceeded. Therefore, it is confirmed whether there is an adjacent resource block having a low CQI.
- RB is lower than RB8. Therefore, it is confirmed whether a frequency resource block can be generated by exchanging with the mobile station UE A that is scheduled to be assigned to the adjacent resource block RB7 of RB 8 next time. In this case, since it can be generated, UE A is assigned to RB8 and UE B is assigned to RB7.
- RB 2 which is the eighth CQI
- mobile station UE A is assigned three frequency blocks (RB 2, 4, and 7). Then, the maximum frequency block number “2” is exceeded. Therefore, it is confirmed whether there is an adjacent resource block having a low CQI. Here, there is no adjacent resource block whose CQI is lower than RB 2. Therefore, in RB2, the mobile station UE C having the best CQI is allocated after UE A.
- This embodiment also uses FIG. 9 as a table in which the CQI of each mobile station is ranked for each resource block.
- (A) of FIG. 8 is an example in the case of (1) described in the update process of the second embodiment.
- resource block allocation is set to the mobile station with the highest CQI in each resource block.
- mobile station UE A is a candidate to which resource blocks RB 2, 4 and 7 are assigned
- mobile station UE B is a candidate to which resource blocks RB 3, 6 and 8 are assigned
- mobile station UE C is a candidate to which resource blocks RB 1 and 5 are assigned.
- the mobile station UE A having the highest CQI is assigned.
- the mobile station UE A is assigned three frequency blocks (RB 2, 4, and 7). Then, the maximum frequency block number “2” is exceeded. Therefore, a resource block adjacent to RB2 having the lowest CQI is confirmed. In this case, RB1 and RB3 are confirmed, and the mobile station UE B assigned to RB3 with the higher CQI is set to be assigned temporarily.
- a resource block is allocated to the mobile station UE C having the second CQI.
- the mobile station UE C is a candidate to which resource blocks RB 1 and 5 are assigned. Since the maximum frequency block number “2” is not exceeded, it is assigned as it is.
- a resource block is allocated to the mobile station UE B having the third CQI.
- the mobile station UE B is a candidate to which resource blocks RB 2, 3, 6 and 8 are allocated.
- the maximum frequency block number “2” is exceeded. Therefore, a resource block adjacent to RB8 having the lowest CQI is confirmed. In this case, RB7 is confirmed and mobile station UE ⁇ A assigned to RB7 is assigned.
- (B) of FIG. 8 is an example in the case of (2) described in the update process of the second embodiment.
- resource block allocation is set to the mobile station with the highest CQI in each resource block.
- mobile station UE A is a candidate to which resource blocks RB 2, 4 and 7 are assigned
- mobile station UE B is a candidate to which resource blocks RB 3, 6 and 8 are assigned
- mobile station UE C is a candidate to which resource blocks RB 1 and 5 are assigned.
- the mobile station UE A having the highest CQI is assigned.
- the mobile station UE A is assigned three frequency blocks (RB 2, 4, and 7). Then, the maximum frequency block number “2” is exceeded. Therefore, a resource block adjacent to RB2 having the lowest CQI is confirmed. In this case, RB1 and RB3 are confirmed, and the mobile station UE B assigned to RB3 with the higher CQI is set to be assigned temporarily.
- a resource block is allocated to the mobile station UE C having the second CQI.
- the mobile station UE C is a candidate to which resource blocks RB 1 and 5 are assigned. Since the maximum frequency block number “2” is not exceeded, it is assigned as it is.
- a resource block is allocated to the mobile station UE B having the third CQI.
- the mobile station UE B is a candidate to which resource blocks RB 2, 3, 6 and 8 are allocated.
- the maximum frequency block number “2” is exceeded. Therefore, in RB8 having the lowest CQI, a UE C having the next best CQI after UE B is temporarily allocated. However, since the maximum number of frequency blocks “2” is exceeded, UE A having the best CQI is assigned next to UE C.
- (C) of FIG. 8 is an Example in the case of (3) described in the update process of the second embodiment.
- resource block allocation is set to the mobile station with the highest CQI in each resource block.
- mobile station UE A is a candidate to which resource blocks RB 2, 4 and 7 are assigned
- mobile station UE B is a candidate to which resource blocks RB 3, 6 and 8 are assigned
- mobile station UE C is a candidate to which resource blocks RB 1 and 5 are assigned.
- the mobile station UE A having the highest CQI is assigned.
- the mobile station UE A is assigned three frequency blocks (RB 2, 4, and 7).
- the maximum frequency block number “2” is exceeded. Therefore, it is confirmed whether a resource block adjacent to RB2 having the lowest CQI is already allocated. In this case, neither RB1 nor RB3 has been assigned yet. Therefore, it is set so that UE C having the best CQI after UE A is assigned in RB2.
- a resource block is allocated to the mobile station UE C having the second CQI.
- the mobile station UE C is a candidate to be assigned resource blocks RB 1, 2, and 5. Since the maximum frequency block number “2” is not exceeded, it is assigned as it is.
- a resource block is allocated to the mobile station UE B having the third CQI.
- the mobile station UE B is a candidate to which resource blocks RB 3, 6 and 8 are allocated.
- the maximum frequency block number “2” is exceeded. Therefore, it is confirmed whether or not a resource block adjacent to RB8 having the lowest CQI is already allocated. In this case, since the mobile station UE A is assigned to RB7, this UE A is assigned.
- (D) of FIG. 8 is an Example in the case of (4) described in the update process of the second embodiment.
- resource block allocation is set to the mobile station with the highest CQI in each resource block.
- mobile station UE A is a candidate to which resource blocks RB 2, 4 and 7 are assigned
- mobile station UE B is a candidate to which resource blocks RB 3, 6 and 8 are assigned
- mobile station UE C is a candidate to which resource blocks RB 1 and 5 are assigned.
- the mobile station UE A having the highest CQI is assigned.
- the mobile station UE A is assigned three frequency blocks (RB 2, 4, and 7).
- the maximum frequency block number “2” is exceeded. Therefore, it is confirmed whether or not the resource block adjacent to RB2 having the lowest CQI has a lower CQI than the own RB. In this case, since both sides are not low, the mobile station UE C having the best CQI after the mobile station UE A in RB2 is set to be temporarily allocated.
- a resource block is allocated to the mobile station UE C having the second CQI.
- the mobile station UE C is a candidate to which resource blocks RB 1 and 5 are allocated. Since the maximum frequency block number “2” is not exceeded, it is assigned as it is.
- a resource block is allocated to the mobile station UE B having the third CQI.
- the mobile station UE B is a candidate to which resource blocks RB 2, 3, 6, and 8 are allocated. Then, the maximum frequency block number “2” is exceeded. Therefore, it is confirmed whether or not the resource block adjacent to RB2 having the lowest CQI has a lower CQI than the own RB.
- RB7 since RB7 is low, it is confirmed whether a frequency resource block can be generated by exchanging with mobile station UE A that is scheduled to be allocated to adjacent resource block RB7 of RB8. In this case, since it can be generated, UE A is assigned to RB8 and UE B is assigned to RB7.
- base station and mobile station of the present invention can be configured by hardware as is apparent from the above description, but can also be realized by a computer program.
- the present invention is applicable to general mobile radio systems that perform resource block allocation.
Abstract
Description
3GPP TR 25.814 (V7.1.0), "Physical layer aspects for evolved Universal Terrestrial Radio Access (UTRA)," http://www.3gpp.org/ftp/Specs/archive/25_series/25.814/. W. Rhee and J. M. Cioffi, "Increase in capacity of multi user OFDM system using dynamic subchannel allocation," Proc. IEEE VTC’00, Tokyo, Japan, May 2000, pp.1085(1089. NEC Group, R1-071507, "DL unicast resource allocation signaling," 3GPP TSG-RAN WG1 Meeting #48bis, St. Julian’s, Malta, 26-30 March 2007.
を有することを特徴とする。
101基地局(BS)
102、103、104 移動局(UE)
ここで、更新処理(ステップ503)について説明する。
(1)割り当てようとしているリソースブロックに隣接する隣接リソースブロックにおいて良好な(好適には最良な)チャネル状態を有する移動局を、割り当てる候補として設定する。
(2)その移動局に対してリソースブロックを割り当てることができないため、その移動局を順位付けた中から外す処理を行う。割り当てようとしているリソースブロックにおいて、その移動局の次にチャネル状態が良好である移動局(下位移動局)を、割り当てる候補として設定する。
(3)両隣のリソースブロックが既に移動局に割り当てられているかを確認する。まだ両方とも割り当てられていない場合は、そのリソースブロックにおいてその割り当てようとしている移動局の次にチャネル状態が良好である移動局を、割り当てる候補として設定する。一方、どちらか一方の隣接リソースブロックが割り当てられている場合は、隣接するリソースブロックに割り当てられている移動局にそのリソースブロックを割り当てる。既に両隣の隣接リソースブロックが割り当てられている場合は、最良なチャネル状態を有する隣接リソースブロックに割り当てられている移動局を割り当てる候補として設定する。
(4)スケジューラは、割り当てようとしているリソースブロックのCQIより低いCQIを有する隣接リソースブロックがあるかを確認する。ある場合は(両隣共低い場合は、よりCQIが低い方)、その隣接リソースブロックで現在最良なチャネル状態を有すると設定されている移動局と、その割り当てようとしている移動局とを交換してリソースブロックを割り当てると、その移動局の周波数ブロック数が最大周波数ブロック数を上回らずに、リソースブロック群を生成できるかを確認する。生成できる場合は交換し、生成できない場合は、割り当てようとしているリソースブロックにおいて、その移動局の次にチャネル状態が良好である移動局と交換した場合にリソースブロック群が生成できるかを確認する。一方、割り当てようとしているリソースブロックのCQIより低いCQIを有する隣接のリソースブロックがない場合は、割り当てようとしているリソースブロックにおいて、その移動局の次にチャネル状態が良好である移動局を割り当てる候補と設定する。
上記実施の形態とは異なるスケジューリング方法について図6を用いて説明する。本実施の形態では、最良のCQIを持つ移動局UEから選択し、選択された移動局UEからリソースブロックを割り当てていく場合について説明する。
(1)選択されなかったリソースブロックに隣接するリソースブロックにおいて良好な(好的には最良である)チャネル状態を有する移動局を割り当てる候補として設定する。
(2)選択されなかったリソースブロックにおいて、その移動局の次にチャネル状態が良好である移動局を、割り当てる候補として設定する。
(3)選択されなかったリソースブロックに隣接するリソースブロックが既に移動局に割り当てられているかを確認する。まだ両隣のリソースブロックが割り当てられていない場合は、そのリソースブロックにおいて現在良好な(好的には最良である)チャネル状態である移動局の次にチャネル状態が良好である移動局を割り当てる候補として設定する。一方、どちらか一方の隣接リソースブロックが割り当てられている場合は、その隣接リソースブロックに割り当てられている移動局をそのリソースブロックの割り当てる候補として設定する、既に隣接リソースブロックが全部割り当てられている場合は、隣接リソースブロックにおいて良好な(好的には最良である)チャネル状態を有する移動局を割り当てる候補として設定する。
(4)スケジューラは、選択されなかったリソースブロックのCQIより低いCQIを有する隣接リソースブロックがあるかを確認する。ある場合は、そのリソースブロックで現在良好な(好的には最良である)なチャネル状態を有すると設定されている移動局と、割り当てようとしている移動局とを交換すると、リソースブロック群を生成できるかを確認する。できる場合は交換し、生成できない場合は、割り当てようとしているリソースブロックにおいて、その移動局の次にチャネル状態が良好である移動局と交換した場合にリソースブロック群を生成できるかを確認する。一方、選択されなかったリソースブロックのCQIより低いCQIを有する隣接のリソースブロックがない場合は、選択されなかったリソースブロックにおいて、その移動局の次にチャネル状態が良好である移動局を割り当てる候補として設定する。
本実施例では、8リソースブロックを3つの移動局UE(UE A、UE BおよびUE C)に割り当て、最大周波数ブロック数を2として設定した場合を用いて説明する。
本実施例では、8リソースブロックを3つの移動局UE(UE A、UE BおよびUE C)に割り当て、最大周波数ブロック数を2として設定した場合を用いて説明する。
次に3番目のCQIを持つ移動局UE Bにリソースブロックを割り当てる。移動局UE BはリソースブロックRB 2、3、6および8が割り当てられる候補となる。そうすると、最大周波数ブロック数“2”を超えてしまう。そこで、この中でCQIが最も低いRB2に隣接するリソースブロックが自RBよりCQIが低いかを確認する。この場合、RB7が低いので、RB 8の隣接リソースブロックRB7に割り当てる予定である移動局UE Aと交換して割り当てると周波数リソースブロックが生成できるかを確認する。この場合、生成できるのでRB8にUE Aを割り当て、RB7にUE Bを割り当てる。
Claims (25)
- 無線通信システムであって、
チャネル状態に基づいて、リソースブロック毎に移動局を順位付けするランキング手段と、
周波数軸上で少なくとも1以上のリソースブロックが連続して成るリソースブロック群の1移動局に対する数が設定数以下になるように、リソースブロックを前記移動局の順位付けに基づいて移動局に割り当てる割当手段と
を有することを特徴とする無線通信システム。 - 前記割当手段は、移動局に割り当てるリソースブロックを、前記移動局の順位付けに従ってリソースブロック毎に決定することを特徴とする請求項1に記載の無線通信システム。
- 前記割当手段は、チャネル状態が良好であるリソースブロックから順に、そのリソースブロックを割り当てる移動局を決定することを特徴とする請求項2に記載の無線通信システム。
- 前記割当手段は、移動局に割り当てるリソースブロックを、前記移動局の順位付けに従って移動局毎に決定することを特徴とする請求項1に記載の無線通信システム。
- 前記割当手段は、チャネル状態が良好である移動局から順に、そのリソースブロックを割り当てることを特徴とする請求項4に記載の無線通信システム。
- 前記割当手段は、リソースブロックを移動局に割り当てる際、既にその移動局に割り当てられているリソースブロック群の数が前記設定数を超えてしまう場合、そのリソースブロックと隣接するリソースブロックとから成るリソースブロック群を生成することを特徴とする請求項2から請求項5のいずれかに記載の無線通信システム。
- 前記割当手段は、リソースブロックを移動局に割り当てる際、既にその移動局に割り当てられているリソースブロック群の数が前記設定数を超えてしまう場合、隣接するリソースブロックが割り当てられる移動局又は割り当てられた移動局にそのリソースブロックを割り当てることによって、リソースブロック群を生成することを特徴とする請求項2から請求項6のいずれかに記載の無線通信システム。
- 前記割当手段は、リソースブロックを移動局に割り当てる際、既にその移動局に割り当てられているリソースブロック群の数が前記設定数を超える場合、前記移動局の下位の順位の移動局にリソースブロックを割り当て、リソースブロック群を生成することを特徴とする請求項2から請求項7のいずれかに記載の無線通信システム。
- 基地局であって、
チャネル状態に基づいて、リソースブロック毎に移動局を順位付けするランキング手段と、
周波数軸上で少なくとも1以上のリソースブロックが連続して成るリソースブロック群の1移動局に対する数が設定数以下になるように、リソースブロックを前記移動局の順位付けに基づいて移動局に割り当てる割当手段と
を有することを特徴とする基地局。 - 前記割当手段は、移動局に割り当てるリソースブロックを、前記移動局の順位付けに従ってリソースブロック毎に決定することを特徴とする請求項9に記載の基地局。
- 前記割当手段は、チャネル状態が良好であるリソースブロックから順に、そのリソースブロックを割り当てる移動局を決定することを特徴とする請求項10に記載の基地局。
- 前記割当手段は、移動局に割り当てるリソースブロックを、前記移動局の順位付けに従って移動局毎に決定することを特徴とする請求項9に記載の基地局。
- 前記割当手段は、チャネル状態が良好である移動局から順に、そのリソースブロックを割り当てることを特徴とする請求項12に記載の基地局。
- 前記割当手段は、リソースブロックを移動局に割り当てる際、既にその移動局に割り当てられているリソースブロック群の数が前記設定数を超えてしまう場合、そのリソースブロックと隣接するリソースブロックとから成るリソースブロック群を生成することを特徴とする請求項10から請求項13のいずれかに記載の基地局。
- 前記割当手段は、リソースブロックを移動局に割り当てる際、既にその移動局に割り当てられているリソースブロック群の数が前記設定数を超えてしまう場合、隣接するリソースブロックが割り当てられる移動局又は既に割り当てられた移動局にそのリソースブロックを割り当てることによって、リソースブロック群を生成することを特徴とする請求項10から請求項14のいずれかに記載の基地局。
- 前記割当手段は、リソースブロックを移動局に割り当てる際、既にその移動局に割り当てられているリソースブロック群の数が前記設定数を超える場合、前記移動局の下位の順位の移動局にリソースブロックを割り当て、リソースブロック群を生成することを特徴とする請求項10から請求項15のいずれかに記載の基地局。
- リソースブロック割当方法であって、
周波数軸上で少なくとも1以上のリソースブロックが連続して成るリソースブロック群の1移動局に対する数が設定数以下になるように、チャネル状態に従ってリソースブロック毎に移動局を順位付けた情報に基づいて、リソースブロックを移動局に割り当てることを特徴とするリソースブロック割当方法。 - 移動局に割り当てるリソースブロックを、前記移動局を順位付けた情報に従ってリソースブロック毎に決定することを特徴とする請求項17に記載のリソースブロック割当方法。
- チャネル状態が良好であるリソースブロックから順に、そのリソースブロックを割り当てる移動局を決定することを特徴とする請求項18に記載のリソースブロック割当方法。
- 移動局に割り当てるリソースブロックを、前記移動局を順位付けた情報に従って移動局毎に決定することを特徴とする請求項17に記載のリソースブロック割当方法。
- チャネル状態が良好である移動局から順に、そのリソースブロックを割り当てることを特徴とする請求項20に記載のリソースブロック割当方法。
- リソースブロックを移動局に割り当てる際、既にその移動局に割り当てられているリソースブロック群の数が前記設定数を超えてしまう場合、そのリソースブロックと隣接するリソースブロックとから成るリソースブロック群を生成することを特徴とする請求項18から請求項21のいずれかに記載のリソースブロック割当方法。
- リソースブロックを移動局に割り当てる際、既にその移動局に割り当てられているリソースブロック群の数が前記設定数を超えてしまう場合、隣接するリソースブロックが割り当てられる移動局又は割り当てられた移動局にそのリソースブロックを割り当てることによって、リソースブロック群を生成することを特徴とする請求項18から請求項22のいずれかに記載のリソースブロック割当方法。
- リソースブロックを移動局に割り当てる際、既にその移動局に割り当てられているリソースブロック群の数が前記設定数を超える場合、前記移動局の下位の順位の移動局にリソースブロックを割り当て、リソースブロック群を生成することを特徴とする請求項18から請求項23のいずれかに記載のリソースブロック割当方法。
- 基地局のプログラムであって、前記プログラムは前記基地局に、
周波数軸上で少なくとも1以上のリソースブロックが連続して成るリソースブロック群の1移動局に対する数が設定数以下になるように、チャネル状態に従ってリソースブロック毎に移動局を順位付けた情報に基づいて、リソースブロックを移動局に割り当てる処理を実行させる
ことを特徴とするプログラム。
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2009
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- 2009-03-16 CN CN200980107190.4A patent/CN101960901A/zh active Pending
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GB2476488A (en) * | 2009-12-23 | 2011-06-29 | Nec Corp | Allocating physical resource blocks to a user device for transmitting uplink data |
US8929313B2 (en) | 2009-12-23 | 2015-01-06 | Nec Corporation | Resource allocation |
WO2011077658A1 (ja) * | 2009-12-24 | 2011-06-30 | 日本電気株式会社 | 割り当て可能な無線リソース選択方法、割り当て可能な無線リソース選択装置、および通信装置 |
US9072097B2 (en) | 2009-12-24 | 2015-06-30 | Nec Corporation | Method for selecting allocable wireless resources, device for selecting allocable wireless resources, and communication device |
US20110216721A1 (en) * | 2010-03-03 | 2011-09-08 | Samsung Electronics Co. Ltd. | Apparatus and method for allocating resource in multi-carrier system |
US8780827B2 (en) * | 2010-03-03 | 2014-07-15 | Samsung Electronics Co., Ltd. | Apparatus and method for allocating resource in multi-carrier system |
Also Published As
Publication number | Publication date |
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JPWO2009116489A1 (ja) | 2011-07-21 |
JP5633929B2 (ja) | 2014-12-03 |
CN101960901A (zh) | 2011-01-26 |
US20100329199A1 (en) | 2010-12-30 |
US8774022B2 (en) | 2014-07-08 |
JP2014003714A (ja) | 2014-01-09 |
JP5645038B2 (ja) | 2014-12-24 |
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