WO2011033748A1 - Radio resource scheduling method and scheduler - Google Patents

Abstract

Provided are a scheduling method and scheduler wherein the interference between cells can be avoided or reduced. There are included average rate calculating units (110) each for calculating a time-average value of the amount of communication with a respective one of a plurality of mobile stations in the local cell; a resource allocation range limiting unit (111) for limiting the allocation range of radio resource to be used for communications with the mobile stations in the local cell in accordance with the time-average values; and a resource allocation deciding unit (112) for setting the radio resource to be used for communications with the mobile stations such that the interference with an adjacent cell is reduced within the limited allocation range.

Description

Radio resource scheduling method and scheduler

The present invention relates to a multi-cell radio communication system, and more particularly, to a radio resource scheduling method and scheduler, and a radio communication apparatus using the same.

If the same radio resources are used between cells in a multi-cell environment, they interfere with each other, resulting in degradation of communication quality and throughput. Accordingly, various measures have been proposed for scheduling not to use the same radio resource between cells or adjusting transmission power so as not to interfere.

For example, in the wireless communication system disclosed in Patent Document 1, a time channel having a large interference power is used by a mobile station in the center of the cell and a small power is allocated, and a time channel having a small interference power is used by a mobile station in the cell periphery. However, a scheduling method of allocating large electric power is employed. Also, time and frequency channel allocation information is obtained from the neighboring cell, and in the channel allocation to the mobile station of the own station cell, the interference power level from the neighboring cell is assigned as much as possible in the neighboring cell with the time channel as low as possible. A scheduling method of selecting a frequency channel that does not overlap with the frequency channel is employed (see paragraphs 0080-0094 and FIGS. 9 to 12 of Patent Document 1).

International Publication No. WO2006-043588

However, in the scheduling method described above, if there is data to be transmitted, as much data as possible is transmitted at each transmission timing for each mobile station. For this reason, even if a device for reducing the interference between cells is used, the time variation of the data amount causes the time variation of the interference, and efficient communication cannot be performed.

For example, in the above-described Patent Document 1, an attempt is made to assign a frequency channel that does not overlap with the frequency channel assigned in the adjacent cell as much as possible. However, there may be a case where the frequency channel of the adjacent cell overlaps due to time variation of the data amount.

Therefore, an object of the present invention is to provide a scheduling method and a scheduler that can avoid or reduce interference between cells.

A scheduling method according to the present invention is a scheduling method in a radio communication apparatus that determines radio resources to be used for communication with each of a plurality of mobile stations in a multi-cell environment, and the amount of communication with each mobile station in the own cell. The allocation range of radio resources used for communication with the mobile station in the own cell is limited according to the time average value, and the interference with each mobile station is reduced within the limited allocation range so that interference with adjacent cells is reduced. A radio resource used for communication is set.

The scheduler according to the present invention is a scheduler in a radio communication apparatus that determines radio resources used for communication with each of a plurality of mobile stations in a multi-cell environment, and is a time average of the amount of communication with each mobile station in its own cell Average value calculating means for calculating a value, and resource allocation determining means for setting radio resources to be used for communication with each mobile station so that interference with adjacent cells is reduced within the limited allocation range. It is characterized by having.

According to the present invention, by limiting the allocation range of radio resources according to the time average of the communication volume with each mobile station, it is possible to suppress the situation where the usage of radio resources increases instantaneously due to an increase in the communication rate of the mobile station It is possible to avoid or reduce interference between cells caused by time variation of the data amount, particularly unexpected interference to neighboring cells.

1 is a network configuration diagram showing a schematic configuration of a wireless communication system according to an embodiment of the present invention. It is a block diagram which shows the structure of the radio | wireless communication apparatus in the radio | wireless communications system shown in FIG. It is a block diagram which shows the functional structure of the scheduler in the radio | wireless communication apparatus by 1st Example of this invention. It is a schematic diagram which shows an example of the radio | wireless resource structure for demonstrating the scheduling method by 1st Example of this invention. It is a schematic diagram which shows the example of an expansion of the radio | wireless resource allocation range when an average rate rises. It is a schematic diagram which shows the example of a change of the radio | wireless resource allocation range when an average rate fluctuates. (A) is a schematic diagram illustrating an example of a multi-cell radio communication system, and (B) is a diagram illustrating an example of a radio resource configuration. 4 is a flowchart illustrating a scheduling method according to the first embodiment of the present invention. (A), (B), (C) is a schematic diagram which shows an example of the radio | wireless resource allocation range in each adjacent cell. It is a block diagram which shows the structure of the scheduler in the radio | wireless communication apparatus by 2nd Example of this invention. It is a schematic diagram which shows an example of the radio | wireless resource structure for demonstrating the scheduling method by 2nd Example of this invention. (A), (B), (C) is a schematic diagram which shows an example of the allocation priority of the radio | wireless resource in each adjacent cell.

1. System Configuration In the following, in order not to complicate the description, as an example, consider a multi-cell environment system as shown in FIG.

In FIG. 1, it is assumed that a plurality of wireless communication devices including the wireless communication devices 11-13 are connected by a network 14 so as to be communicable. The wireless communication devices 11-13 control the cells C1-C3, respectively, and these cells are adjacent to each other. As will be described later, each radio communication device periodically exchanges radio resource allocation range information with a radio communication device in an adjacent cell, and executes radio resource scheduling. Note that a plurality of wireless communication devices connected by the network 14 may be included in one base station, or each wireless communication device may be one base station.

2, the wireless communication apparatus according to the present embodiment includes a wireless unit 101, a transmission / reception processing unit 102, a propagation quality acquisition unit 103, a scheduler 104, and a communication unit 105. The wireless unit 101 performs wireless communication with the mobile station MS, and the transmission / reception processing unit 102 performs various processes of transmission data and reception data. Specifically, the amount of data communication with each mobile station is notified to the scheduler 104, and in accordance with an instruction from the scheduler 104, transmission data addressed to each mobile station is assigned to a radio resource to create a transmission signal. The transmission signal is transmitted from the transmission / reception antenna by the wireless unit 101.

The propagation quality acquisition unit 103 outputs the propagation quality with each mobile station to the scheduler 104. Uplink propagation quality is obtained by receiving a pilot signal of a known signal sequence transmitted by each mobile station and measuring the received signal strength, signal-to-noise ratio, or error rate. The downlink propagation quality is measured in the same way by each mobile station receiving a pilot signal from the radio communication device, and transmitted to the radio communication device using an uplink signal.

The scheduler 104 inputs the propagation quality between each mobile station from the propagation quality acquisition unit 103, the transmission waiting data amount for each mobile station from the transmission / reception processing unit 102, and the resource allocation range information of neighboring cells through the communication unit 105. Then, a radio resource used for communication with each mobile station is determined and notified to the transmission / reception processing unit 102. The resource allocation range information is exchanged with wireless communication apparatuses in adjacent cells via the communication unit 105 and the network 14. Hereinafter, the functional configuration of the scheduler 104 will be described in detail.

2. Scheduler 2.1) First Example As shown in FIG. 3, the scheduler 104 functionally includes an average rate calculation unit 110, a radio resource allocation range limiting unit 111, a radio resource allocation determination unit 112, and an allocation resource control unit 113. Including. Average rate calculation section 110 receives the amount of data waiting for transmission for each mobile station from transmission / reception processing section 102 and outputs each average rate Ravr to radio resource allocation range restriction section 111. The average rate Ravr is obtained, for example, by averaging the amount of communication data with each mobile station at predetermined time intervals.

The radio resource allocation range restriction unit 111 refers to the average rate Ravr of each mobile station input from the average rate calculation unit 110 and the propagation quality information for each mobile station to realize the average rate of each mobile station. Calculate the total required radio resources. Furthermore, based on the allocation range information of the radio resource in the current neighboring cell and the radio resource allocation information in the current own cell, the necessary total radio resources are satisfied, and the interference does not interfere with the neighboring cell or the interference is reduced. Then, the radio resource allocation range in the own cell is determined and output to the radio resource allocation determining unit 112. The radio resource allocation range information of the own cell is also notified to neighboring cells through the communication unit 105.

The radio resource allocation determination unit 112 performs scheduling using a scheduling evaluation value corresponding to the communication data amount and propagation quality information for each mobile station, determines radio resource allocation for each mobile station, and sends the allocation to the allocation resource control unit 113. Output. However, the radio resource allocation for each mobile station is determined under the restriction that the radio resource allocation range is determined by the radio resource allocation range limiter 111. Since the basic function of the radio resource allocation determination unit 112 is the same as that of the existing radio resource allocation except that it is limited to the radio resource allocation range, details are omitted.

The allocation resource control unit 113 performs resource allocation control of the transmission / reception processing unit 102 according to the radio resource allocation information and the radio resource allocation range information.

The scheduler 104 described above can also realize an equivalent function by executing a program stored in a recording medium (not shown) on a program control processor such as a CPU.

2.2) Determination of Allocation Range Next, the operation of the radio resource allocation range restriction unit 111 in the scheduler 104 will be described in detail with reference to FIGS. First, in order not to complicate the explanation, a case will be exemplified in which cells C1-C3 are adjacent to each other, and there is one mobile station MS1-MS3 in each cell, and radio resources are allocated to each mobile station. Here, it is assumed that the radio resource is composed of M blocks and can be allocated in units of blocks, and interference may occur between resource blocks having the same number in each cell.

As shown in FIG. 4, in the cells C1-C3, different radio resource allocation start positions are set in advance. Here, it is assumed that allocation range start position Pas1 in cell C1 is block number # 1, allocation range start position Pas2 in cell C2 is block number # 4, and allocation range start position Pas3 in cell C3 is block number # 7.

If one resource block is necessary for realizing the average rate of the mobile station MS1, the radio resource allocation range limiting unit 111 of the radio communication device 11 in the cell C1 sets the block number # 1 for the mobile station MS1. Are determined as the radio resource allocation range 210. Similarly, the radio resource allocation range restriction unit 111 of the radio communication device 12 in the cell C2 blocks three mobile stations MS2 if the three resource blocks are necessary to realize the average rate of the mobile station MS2. The resource of number # 4-6 is determined as the radio resource allocation range 220. If two resource blocks are required for realizing the average rate of the mobile station MS3, the radio resource allocation range restriction unit 111 of the radio communication device 12 in the cell C3 will block the mobile station MS3 with block number # 7. The resource of −8 is determined as the radio resource allocation range 230. In addition, if there are a plurality of mobile stations in each cell, the total number of resource blocks necessary for them becomes the radio resource allocation range in the cell.

The radio resource allocation ranges 210, 220, and 230 allocated in the cells C1, C2, and C3 are notified to the neighboring cells, and each cell allocates the radio resources of its own cell so as to avoid the range allocated in the neighboring cells as much as possible. Determine the range. In FIG. 4, the resource range 211 of the cell C1, the resource range 221 of the cell C2, and the resource range 231 of the cell C3 marked by “x” are the resource ranges assigned by the neighboring cells.

In this way, in FIG. 4, the total required radio resource blocks of the mobile stations connected in each cell are 1, 3, and 2, respectively, which is less than the total required radio resource block number M for all cells. Can be set so that they do not overlap each other, and interference between cells can be avoided.

As shown in FIG. 5, when the amount of communication between the wireless communication device of each cell and the mobile station increases not instantaneously but continuously, the average rate calculated by the average rate calculating unit 110 also increases. As a result, the resource allocation range restriction unit 111 needs to add a resource range to be allocated to the mobile station of the cell. At this time, if there is a resource block that is not used in the adjacent cell, add it to the additional range. Assign as. Therefore, the allocation range is not always a continuous block number. In FIG. 5, the cell C1 can set the allocation range 210 composed of three consecutive blocks, but the added block numbers are not consecutive in the cells C2 and C3 as in the allocation ranges 220 and 230.

Even when the cell load increases and the allocation range is expanded, as shown in FIG. 5, if the total number of required radio resource blocks of mobile stations connected in each cell is M or less, The radio resource ranges 210, 220, and 230 to be used can be set so as not to overlap each other. Therefore, the resource allocation determination unit 112 of the radio communication apparatus in each cell allocates resources to each mobile station in the cell within this allocation range. For example, even if the communication amount suddenly increases, Interference can be avoided.

As shown in FIG. 6, when the total number of required radio resource blocks of mobile stations connected in each cell exceeds M, the same between adjacent cells by selecting the mobile station to be communicated and adjusting the transmission power Interference when using radio resource blocks is reduced (see, for example, Patent Document 1).

For example, after determining the allocation range 212 (block number # 1- # 3) to the mobile station MS1 of the cell C1, further allocate the allocation range 220 (block number # 4- # 6) to the mobile station MS2 of the cell C2 Consider the case of expanding two blocks. If mobile station MS2 is located in the center of cell C2 and can be assigned a relatively small transmission power, interference can be reduced by assigning, for example, block number # 3 as an additional range.

Also, according to the load variation of each cell, it is possible to shift the allocation range so that the allocation ranges do not overlap each other. For example, when the load decreases in another cell and the resource of the block number # 9 becomes available, the range 230 assigned to the mobile station MS3 of the cell C3 is shifted to the block number # 9 side. This makes it possible to extend the allocation range of the mobile station MS2 in the cell C2 to the block number # 7. With such allocation range control, it is possible to secure a wider allocation range 222 for the mobile station MS2 of the cell C2 whose average rate has increased.

By determining the radio resource allocation range in this way, the radio resources used for communication are limited according to the time average value of the communication amount with each mobile station, and the radio resources to be used have less interference with adjacent cells. Set as follows.

2.3) Application Example In FIG. 4 to FIG. 6 described above, a radio resource including M blocks is used for explanation. However, as a radio resource, if the multiple access method is OFDMA (Orthogonal Frequency Division Multiple Access), For example, there are subcarriers in the frequency direction (or a bundle of a plurality of subcarriers), OFDMA symbols and frames in the time direction. If the multiple access method is a direct spreading method, a spreading code is applicable. A plurality of elements may be combined as a radio resource.

Hereinafter, a case where the first embodiment of the present invention is applied to a multi-cell environment as shown in FIGS. 7A and 7B will be described. As shown in FIG. 7A, here, BS1, BS2, and BS3 are radio stations or cells covered by base stations, and C1, C2, and C3 are respectively covered by base stations BS1, BS2, and BS3. Assume that MS1, MS2, and MS3 are mobile stations and communicate with base stations BS1, BS2, and BS3, respectively. Here, as shown in FIG. 7B, it is assumed that the resource structure in the OFDMA system is provided, and a subcarrier in the frequency direction or a bundle of a plurality of subcarriers is a frequency block # 1- # N, and a time block in the time direction. Frames # 1, # 2,... Are a combination of OFDMA symbols or a plurality of OFDMA symbols. When radio resources in the time direction are used, the propagation quality is measured in consideration of radio resource allocation timing in downlink communication.

An example of combining these two radio resource elements will be described as an example of updating the radio resource allocation range. In the example shown in FIG. 4, different radio resource allocation start positions are set in advance for each cell. Here, in the configuration shown in FIG. It is assumed that the head block of a different frame for a cell is set as a radio resource allocation start position.

In FIG. 8, first, the same number of frames as the number of adjacent cells are set as a set (step 301). Subsequently, the radio resource allocation range restriction unit 111 acquires radio resource allocation range information from the neighboring cell (step 302), and calculates the average rate of each mobile station in the own cell from the average rate calculation unit 110. The propagation quality is input from the propagation quality acquisition unit 103 (step 303).

First, the radio resource allocation range restriction unit 111 determines whether or not the allocation range of the own cell should be increased from the calculated average rate (step 304). When the allocation range is to be increased (step 304: YES), it is determined whether there is a resource available in the frame in the set with reference to the radio resource allocation range information from the neighboring cell (step 305). If there is an available resource (step 305: YES), radio resources are allocated in the frequency direction from the allocation range start position of the own cell according to the average rate and propagation quality of each mobile station (step 306).

If the load becomes high and there are no resources available for radio resources in the frequency direction in the frame of the own cell, the allocation range is increased for radio resources that are not allocated in neighboring cells in other frames in the set. . At that time, a radio resource having a good propagation quality is selected from the unallocated radio resources of the adjacent cell for the mobile station having a higher average rate.

When the allocation range is determined in this way, the radio resource allocation range information of the own cell is notified to the neighboring cell (step 307), and the process returns to step 302.

When there is no unassigned radio resource in the adjacent cell in the frame in the set (step 305: NO), the resource overlapping with the adjacent cell is selected (step 308), and the mobile station whose average rate is increased The selected radio resource is set as an additional allocation range (step 309). The radio resource allocation determining unit 112 allocates a mobile station having a small interference to the adjacent cell to the radio resource whose allocation overlaps with the adjacent cell. When the allocation range is determined in this way, the radio resource allocation range information of the own cell is notified to the neighboring cell (step 307), and the process returns to step 302.

When the allocation range is not increased (step 304: NO), the radio resource allocation range limiter 111 determines whether or not to decrease the allocation range (step 310), and the average rate decreases and the radio resource allocation range is reduced. Sometimes (step 310: YES), for example, radio resources with a low allocation frequency are reduced (step 311). In this way, the allocation range is updated with a frame period equal to the number of adjacent cells (step 307).

Fig. 9 shows the case where each cell updates the allocation range in a 3-frame cycle. As shown in FIG. 9A, the cell C1 determines the allocation range 401 from the frame # 1. As shown in FIGS. 9B and 9C, allocation ranges 402 and 403 are determined from frame # 2 in cell C2 and from frame # 3 in cell C3, respectively. As described above, when the load on each cell is low, different frames are allocated to the three cells, so interference between cells can be avoided. In FIG. 9B, the load of the cell C2 becomes high, and the frame # 2 alone cannot accommodate the load, so the frequency block # 1 of the frame # 3 is also set as the allocation range. In frame # 3, the allocation ranges of cell C2 and cell C3 do not overlap, so interference can be avoided. However, as described above, the allocation range does not have to be continuous as illustrated in FIG. 9 and may be discontinuous.

2.4) Effect As described above, according to the present embodiment, the allocation range of radio resources is determined based on the average data amount rather than the instantaneous data amount of the mobile station, and then the actual radio resource allocation is performed. Therefore, it is possible to avoid or reduce interference between cells due to fluctuations in the data amount.

Furthermore, since radio resource allocation range information is only periodically exchanged between adjacent cells, it is not necessary to frequently exchange radio resource usage between cells. Therefore, there is no radio resource allocation delay due to frequent information exchange, the amount of inter-cell message transmission can be kept low, and transmission power can be reduced by performing efficient communication.

3. Second Embodiment 3.1) Configuration In the first embodiment described above, the radio resource allocation range limiter 111 outputs radio resource allocation range information that limits resource allocation to each mobile station. Radio resource allocation priority information for limiting resource block allocation by priority can also be output.

As shown in FIG. 10, the scheduler 104 according to the second embodiment of the present invention is different from the first embodiment in the radio resource allocation range limiting unit 121, and other configurations and functions are basically shown in FIG. Since it is the same as the scheduler, the same reference numerals are assigned and description thereof is omitted.

The radio resource allocation range limiting unit 121 refers to the average rate Ravr of each mobile station input from the average rate calculation unit 110 and the propagation quality information for each mobile station to realize the average rate of each mobile station. Calculate the total required radio resources. Further, based on the allocation priority information of the radio resource in the current neighboring cell and the radio resource allocation information in the current own cell, the necessary total radio resources are satisfied and the interference with the adjacent cell is reduced or interference is reduced. Then, the radio resource allocation priority in the own cell is determined and output to the radio resource allocation determining unit 112.

The scheduler 104 described above can also realize an equivalent function by executing a program stored in a recording medium (not shown) on a program control processor such as a CPU.

3.2) Priority The radio resource allocation priority indicates a priority order regarding the use of radio resources, and is set so that the degree of interference with neighboring cells is low. The higher the priority is the use in the own cell. For example, the priority of radio resources is shown in descending order as follows.

First priority (highest priority a): Radio resource used to transmit the average rate of the own cell.

Second priority (priority b): A radio resource that is prioritized for use in its own cell when the average rate is exceeded.

Third priority (priority c): A radio resource that may be used in its own cell but is prioritized in the neighboring cell.

Fourth priority (priority d): Radio resources that can be used when resources with the above priorities cannot be used.

As shown in FIG. 11, the highest priority a is assigned to the radio resource 501 used for transmitting the average rate of the own cell, and the priority b is given priority to use in the own cell when the average rate is exceeded. The priority c can be used in the own cell but the radio resource 503 can be used in the adjacent cell, but the priority d cannot be used in the priority a-c. Resource 504 is assigned to each resource.

3.3) Operation The radio resource allocation determination unit 112 determines radio resource allocation for each mobile station according to the communication data amount and propagation quality information for each mobile station. According to this embodiment, each mobile station Scheduling is performed by multiplying the evaluation value of scheduling at the time of allocation to the radio resource allocation priority as a weighting factor. Such weighted scheduling reduces the frequency with which the same radio resource is used between cells, thereby avoiding interference between cells.

If the value obtained by multiplying the scheduling evaluation value by the weighting factor is smaller than the reference value, the use of the radio resource may be prohibited. The reference value is set according to the amount of radio resources required to transmit the average rate, and the reference value is increased as the required radio resources are smaller. The less the required radio resources, the more radio resources that are prohibited from use, and the interference between cells can be clearly avoided.

FIG. 12 shows an example of setting the priority (weighting factor) in an example in which each cell shown in FIG. 9 is assigned and updated in a three-frame cycle. In FIG. 12, radio resources being used in the own cell, radio resources that are not used in the own cell and neighboring cells and have priority to use in the own cell, unused in the own cell and neighboring cells, and used in the own cell The priorities (weighting factors) are set to a, b, c, and d corresponding to the four cases of radio resources without priority and radio resources that are not used in the own cell but are used in neighboring cells. Specifically, the priority level is designated by numerical values such as a = 1.0, b = 0.5, c = 0.2, and d = 0.1.

3.4) Effect As described above, according to the present embodiment, the radio resource having the highest priority is determined according to the average data amount, not the instantaneous data amount of the mobile station, and then according to the priority. Since actual radio resource allocation is performed, the frequency with which the same radio resource is used between cells can be reduced, and interference between cells can be avoided more effectively. As in the first embodiment, there are few messages exchanged between cells, and interference between cells can be avoided or reduced. Therefore, efficient communication can be performed and transmission power can be reduced while keeping the amount of messages exchanged between cells low.

4). Other Embodiments In the above description, the scheduler 104 has been described as being present in the base station of each cell. However, the scheduler 104 may exist independently outside the base station, and a single scheduler may be used for radios of a plurality of base stations. Resource allocation can also be centrally controlled. Further, instead of scheduling the radio resources of the cell, the radio resource allocation of the sectors in the base station may be comprehensively controlled for the sectors obtained by dividing the service area of one base station. Furthermore, the present invention can be applied to both downlink and uplink.

The present invention can be applied to a base station or a radio resource scheduler of a mobile communication system.

11-13 Radio Communication Device 14 Network 101 Radio Unit 102 Transmission / Reception Processing Unit 103 Propagation Quality Acquisition Unit 104 Scheduler 105 Communication Unit 110 Average Rate Calculation Unit 111 Resource Allocation Range Limiting Unit 112 Resource Allocation Determination Unit 113 Allocation Resource Control Unit 121 Resource Allocation Range Restriction part

Claims (20)

A scheduling method in a radio communication apparatus for determining radio resources used for communication with each of a plurality of mobile stations in a multi-cell environment,
Limit the allocation range of radio resources used for communication with mobile stations in its own cell according to the time average value of the traffic with each mobile station in its own cell,
Within the limited allocation range, radio resources used for communication with each mobile station are set so that interference with adjacent cells is reduced.
A scheduling method characterized by the above. The radio resource allocation range is changed while referring to the radio resource allocation range used by neighboring cells according to a change in the time average value of the traffic with each mobile station in the own cell. The scheduling method according to claim 1. When increasing the allocation range of the radio resource, if there is an unused radio resource between the own cell and an adjacent cell, add at least a part of the unused radio resource to the allocation range, 3. The scheduling method according to claim 1, wherein if there is no radio resource, a radio resource used for communication with a mobile station having a small interference with an adjacent cell is added to the allocation range. The scheduling method according to any one of claims 1 to 3, wherein when the allocation range of the radio resource is reduced, a radio resource with a low allocation frequency is deleted from the allocation range. The scheduling method according to any one of claims 1 to 4, wherein the radio resource includes a resource in a frequency direction and / or a resource in a time direction. The scheduling method according to any one of claims 1 to 5, wherein an allocation range of the radio resource is controlled by a priority set according to a degree of interference with an adjacent cell. A scheduler in a radio communication device that determines radio resources used for communication with each of a plurality of mobile stations in a multi-cell environment,
An average value calculating means for calculating a time average value of traffic with each mobile station in the own cell;
Resource allocation range limiting means for limiting an allocation range of radio resources used for communication with a mobile station in the own cell according to the time average value;
Resource allocation determining means for setting radio resources used for communication with each mobile station so that interference to adjacent cells is reduced within the limited allocation range;
The scheduler characterized by having. The resource allocation range limiting means refers to the radio resource allocation range while referring to the radio resource allocation range used by neighboring cells in accordance with the change in the time average value of the traffic with each mobile station in the own cell. The scheduler according to claim 7, wherein the scheduler is changed. When the resource allocation range limiting means increases the radio resource allocation range, if there is an unused radio resource between its own cell and an adjacent cell, at least a part of the unused radio resource is 9. The radio resource used for communication with a mobile station having a small interference with an adjacent cell is added to the allocated range if there is no unused radio resource, and the allocated range is added to the allocated range. The described scheduler. 10. The resource allocation range limiting unit according to claim 7, wherein when the allocation range of the radio resource is decreased, a radio resource having a low allocation frequency is deleted from the allocation range. The described scheduler. The scheduler according to any one of claims 7 to 10, wherein the radio resource includes a resource in a frequency direction and / or a resource in a time direction. The said resource allocation range restriction | limiting means controls the allocation range of the said radio | wireless resource by the priority set according to the degree of the interference with an adjacent cell, The one of Claims 7-11 characterized by the above-mentioned. Scheduler. A wireless communication apparatus comprising the scheduler according to any one of claims 7-12. A radio base station having at least one radio communication device according to claim 13. A multi-cell mobile communication system having the radio base station according to claim 14. A program that causes a program control processor to function as a scheduler in a wireless communication device that determines wireless resources used for communication with each of a plurality of mobile stations in a multi-cell environment,
An average value calculating means for calculating a time average value of traffic with each mobile station in the own cell;
Resource allocation range limiting means for limiting an allocation range of radio resources used for communication with a mobile station in the own cell according to the time average value;
Resource allocation determining means for setting radio resources used for communication with each mobile station so that interference to adjacent cells is reduced within the limited allocation range;
A program that causes the program control processor to function as a scheduler. The resource allocation range limiting means refers to the radio resource allocation range while referring to the radio resource allocation range used by neighboring cells according to a change in the time average value of the traffic with each mobile station in the own cell. The program according to claim 16, wherein the program control processor is made to function so as to change the value. When the resource allocation range limiting means increases the allocation range of the radio resource, if there is an unused radio resource between the own cell and an adjacent cell, at least a part of the unused radio resource is The program control processor is caused to function so as to add a radio resource used for communication with a mobile station having a small interference to an adjacent cell if there is no unused radio resource to the allocation range. The program according to claim 16 or 17, characterized in that The program control processor functions so as to delete a radio resource having a low allocation frequency from the allocation range when the resource allocation range limiting unit decreases the allocation range of the radio resource. Item 19. The program according to any one of Items 16-18. 2. The program control processor according to claim 1, wherein the resource allocation range limiting unit causes the program control processor to function so as to control the radio resource allocation range according to a priority set in accordance with a degree of interference with an adjacent cell. The program according to any one of 16-19.

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