JP2000069548A - Communication band assignment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To average the throughput of a communication equipment by assigning communication bands to second communication equipments having transmission data whose remaining time is longer than a prescribed remaining time from the one having a longer remaining time, and then assigning communication bands to second communication equipments having transmission data whose transmission data amounts are smaller from the one having a smaller transmission data amount. SOLUTION: A radio base station 1 and plural radio terminals 2, 3, and 4 are provided with buffers 11 and 21 for transmission data. A time required for writing transmission data in the buffers 11 and 21 is compared with the present time at the time of scheduling, and the remaining time of the transmission data in the radio base station 1 or the radio terminals 2, 3, and 4 is measured. At first, the radio terminals having transmission data whose remaining time is longer are sorted from the one having a longer remaining time, and when the remaining time of the transmission data is longer than a threshold value, resource assignment processing is operated. Then, the radio terminals having transmission data whose data amounts are smaller are sorted from the one having a smaller data amount, and the resource assignment processing is operated in the sorting order.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication band allocating method performed when one communication device communicates with a plurality of communication devices. In particular, it is effective in a wireless communication system having a wireless base station and a plurality of wireless terminals.

[0002]

2. Description of the Related Art In recent years, multimedia services have attracted attention in access type communication systems. In particular,
2. Description of the Related Art In a wireless communication system, the frequency utilization efficiency is improved by providing a transmission path capable of changing a transmission rate according to service contents. For example, in the time division multiple access method, the number of channels assigned to one user can be changed according to the transmission speed.

Conventionally, in an access type wireless communication system,
In order to avoid communication collision between wireless terminals and perform efficient communication, a method has been adopted in which one wireless base station intensively controls the communication band and communication time of all wireless terminals. Therefore, the centralized control method in the wireless base station performs scheduling for sharing a limited wireless resource among a plurality of wireless terminals. This method has a great influence on the improvement of the throughput and the effective use of the frequency.

[0004]

As a radio resource allocation method in a radio base station, there has been proposed a method of determining a communication band or a communication time in proportion to a transmission data amount or a transmission packet length. In this case, the throughput of the wireless terminal having a small amount of transmission data relatively decreases.

[0005] On the other hand, a method has been considered in which communication is performed preferentially from a wireless terminal having a small amount of transmission data. But,
Similarly to the above-described method, the throughput of the non-priority wireless terminal relatively decreases.

[0006] Further, in consideration of the dwell time on the transmission device side from the generation of the transmission data until the communication band is actually allocated and transmitted, the radio terminal having or having to transmit the transmission data having a long dwell time Priority is given to a method of allocating radio resources. In consideration of such a residence time, it becomes possible to provide a service while maintaining an allowable residence time requested by the user.
However, the start of communication is delayed for traffic having a relatively long allowable residence time. In addition, there is a disadvantage that the average throughput of the entire system is reduced because all wireless terminals allow delay.

[0007] Therefore, the present invention provides a system in which the delay of a communication device with a low priority in communication band allocation does not increase in consideration of the residence time and the amount of transmission data in a transmission-side device for transmission data. It is an object of the present invention to provide a communication band allocating method in which the throughputs of the communication devices in the network are averaged.

[0008]

According to one embodiment of the communication band allocating method of the present invention, the residence time of transmission data in the first communication device and / or the second communication device is set to be shorter than a predetermined residence time. Assigning a communication band to one or more of the second communication devices having long transmission data in order from the second communication device having the transmission data having long residence time;
Allocating a communication band to one or more second communication devices not allocated by the step in order from the second communication device having the transmission data having a small transmission data amount. It is.

In one embodiment of the communication band allocating method according to the present invention, the product or sum of the transmission data residence time and the transmission data amount in the first communication device and / or the second communication device is large. And a step of allocating a communication band in order from the second communication device.

[0010] One embodiment of the communication band allocating method according to the present invention is a communication band allocating method in which the ratio between the residence time of transmission data and the transmission data amount in the first communication device and / or the second communication device is small.
Allocating a communication band in order from the communication device.

In another embodiment of the communication band allocating method according to the present invention, the transmission data transmitted from the second communication device to the first communication device is transmitted by the second communication device. The time at which data is generated is recorded in the header of the transmission data, and at the time of controlling the transmission data, at least the time at which control is performed on the transmission data that occurred at the earliest time is compared with the generation time. It is preferable that the method further includes a step of determining a residence time of the transmission data, and a step of notifying the first communication device of the required amount of transmission data and the residence time. This method is described in FIG.

In another embodiment of the communication band allocating method according to the present invention, the second communication device transmits a request amount to the second communication device with respect to transmission data transmitted from the second communication device to the first communication device. In is notified, the dwell time t of the required amount I [t] to I [0] is incremented by 1 (I [t + 1] to I [1]), and information ΣI [t] is subtracted from the required amount In. Value I
[0] and the allocated amount I allocated to the second communication device.
a, and sequentially subtracting the allocated amount Ia from the required amount I [t + 1] to I [0] to determine the required amount for the residence time t; And a step of notifying the residence time. This method is described in FIG.

[0013] In another embodiment of the communication band allocating method according to the present invention, the step of notifying the first communication device of the request amount and the dwell time includes at least a dwell time corresponding to transmission data having a maximum dwell time; It is preferable to notify the request amount corresponding to the transmission data having the minimum residence time.

In another embodiment of the communication band allocating method according to the present invention, the transmission data transmitted from the second communication device to the first communication device is transmitted by the first communication device from the second communication device. In is notified, and the request amounts I [t] to I [0]
Is incremented by 1 (I [t + 1] to I [1]),
The value obtained by subtracting the information ΣI [t] from the required amount In is represented by I
[0] and the allocated amount I allocated to the second communication device.
It is preferable to calculate a and then subtract the allocation amount Ia from the required amount I [t + 1] to I [0] in order to obtain the required amount for the residence time t. This method is described in FIG.

In another embodiment of the communication band allocating method according to the present invention, the transmission data transmitted from the first communication device to the second communication device is transmitted by the first communication device. Recording the data generation time in the header of the transmission data, and when controlling the transmission data, at least comparing the time and the generation time to control the transmission data that occurred at the earliest time, Determining a residence time of the transmission data. This method is described in FIG.

According to another embodiment of the communication band allocating method of the present invention, the transmission data transmitted from the first communication device to the second communication device is transmitted to the first communication device by the first communication device. Transmission data of the amount In is generated, and the residence time t of the transmission data amounts I [t] to I [0] is incremented by one (I [t
+1] to I [1]), information {I
The value obtained by subtracting [t] is held in I [0], an allocation amount Ia to be allocated to the second communication device is obtained, and the requested amount I [t +
It is preferable to subtract the allocated amount Ia in order from 1] to I [0] to obtain the transmission data amount for the stay time t.
This method is described in FIG.

According to another embodiment of the communication band allocating method of the present invention, it is preferable that the first communication device is a radio base station and the second communication device is a radio terminal.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a configuration diagram of a wireless communication system. The system includes a radio base station 1 and a plurality of radio terminals 2, 3, and 4. The radio base station and the radio terminal have buffers 11 and 21 for transmission data.

The communication band allocating method of the present invention measures a dwell time from when transmission data is generated to when a radio resource is allocated and transmission is possible, and when the dwell time exceeds a certain threshold, the radio band is allocated. The resource allocation process is performed with the terminal having the highest priority. Therefore, the longer the residence time, the higher the priority of the wireless terminal. Next, in a case where all wireless terminals having transmission data having a residence time exceeding the threshold are allocated or do not exist, a resource allocation process is performed with priority given to a wireless terminal having a small transmission data amount. This is a method of assigning the residence time with priority over the transmission data amount. However, the priority is considered only when the residence time exceeds a threshold value.

Therefore, the priorities of the wireless terminals are determined in the following order. (1) A wireless terminal with a long residence time exceeding the threshold (2) A wireless terminal with a short residence time exceeding the threshold (3) A wireless terminal with a residence time below the threshold and small transmission data volume (4) Wireless terminals with a dwell time below the threshold and large amounts of transmitted data

In these procedures, allocation is performed until there is no more available radio resource. When the assignment is not performed due to a shortage of radio resources, transmission is delayed until the next scheduling.

The transmission data amount refers to a relative amount of transmission data stored in a buffer. Further, an absolute quantity representing the size of data in units such as the number of bits or the number of bytes may be used. For example, if the buffer size is 100, 1
It is assumed that the transmission data amount is expressed in steps of an integer up to 00. In this case, if the accumulated transmission data amount is 10% of the entire buffer, the transmission data amount becomes 10, and
If it is 0.1%, the transmission data amount is 1. When the buffer has up to 100 memories, the amount of transmission data stored is the buffer memory itself.

Similarly, the residence time can be expressed in a relative amount. For example, a counter having a relatively long cycle is counted up at regular intervals, and a time from when transmission data is generated or a time when a transmission request is transmitted from a wireless terminal to a time when scheduling is started is represented as follows. be able to.

Dwell time = count value at the start of scheduling−count value when transmission data is generated If the dwell time is 0 or less, dwell time = maximum value of counter−count value when transmission data is generated +
At the start of scheduling

If the threshold value, which is the predetermined residence time, is set to a large value, the effect of delay consideration is small, and the priority tends to be determined almost according to the amount of transmission data.
On the other hand, when a small value is set, priority is determined with emphasis on the residence time over the transmission data amount. Therefore, it is necessary to determine the threshold value of the residence time so that the service efficiency can be improved.

FIG. 2 is a flowchart of the communication band allocating method according to the present invention. The method generally comprises a first step 212
And a subsequent second step 213.

In the first step 212, first, the terminals are sorted in the order of wireless terminals having transmission data having a long residence time in the device (201). Next, if the staying time of the transmission data of the wireless terminal is longer than a threshold value (predetermined staying time) (203), resource allocation processing is performed (2).
04). On the other hand, if not, the process proceeds to the next second stage processing. When the resource allocation processing (204) is performed, the remaining resources are determined (205). The above steps 203 to 205 are repeated for the number of wireless terminals that have not been assigned yet (202 and 206).

By going through the first stage described above, in the second stage, wireless terminals having transmission data having a long residence time in the apparatus have already been eliminated. In the second step 213, first, the radio terminals having the transmission data with the smaller data amount are sorted in the order of the radio terminals (207). Next, resource allocation processing (209) is performed on the wireless terminals in the sort order until the resources are exhausted (210), and this is repeated for the number of wireless terminals that have not been allocated (208 and 211).

FIG. 3 is a flowchart in another embodiment of the communication band allocating method of the present invention. This method is a more simplified version of the communication band allocation method of FIG.

In FIG. 3, first, the radio terminals are sorted in descending order of transmission data amount × residence time (31). this is,
The order may be in the order of the transmission data amount + the wireless terminal having the longer residence time. Regardless of the product or the sum of the transmission data and the residence time, the priority does not change regardless of the execution. It is also preferable that the data is sorted in the order of the wireless terminal having the smaller transmission data amount / residence time (32). Next, until resources are exhausted (35), resource allocation processing (34) is performed on the wireless terminals in the sort order, and this is repeated by the number of wireless terminals that have not been allocated (33 and 36).

FIG. 4 shows a method for measuring the dwell time of transmission data at a radio base station or a radio terminal according to the present invention. When storing the transmission data in the buffer, the write time to the buffer is recorded in the header portion of the data, and the residence time can be obtained by comparing the write time and the current time at the time of scheduling. In addition, the scheduler of the wireless base station can know the staying time by notifying at least the maximum staying time to the wireless base station. When the residence time is determined in the wireless base station, the residence time is measured for each wireless terminal.

As described above, the transmission from the radio base station to the radio terminal can be scheduled based on the time for writing the transmission data stored in the radio base station to the buffer and the size of the buffer.

On the other hand, in the transmission from the radio terminal side to the radio base station side, the radio base station side cannot know the information regarding the data amount and the delay regarding the transmission data by a direct method such as measurement. In this case, when the wireless terminal requests a communication band according to the generated transmission data amount at the time of requesting the allocation of the wireless resource, the wireless base station can convert the transmission data amount of the wireless terminal from the required communication band. it can.

In the transmission from the radio terminal to the radio base station, the radio terminal requests a communication band in accordance with the amount of transmission data at the time of the radio resource allocation request, and the radio base station receives the allocation request. By recording the time and comparing the write time and the current time at the time of scheduling, the scheduler of the base station can know the staying time.

FIG. 5 is a view for explaining the measurement of the residence time in the transmission direction of the transmission data between the radio terminal and the radio base station.

FIG. 5 illustrates a portion for measuring the dwell time for the transmission data from the radio terminal to the radio base station.

FIG. 5 shows that, at the radio terminal, the time at which the transmission data is generated at the radio terminal is recorded in the header of the transmission data, and at the time of controlling the transmission data, at least The control time is compared with the occurrence time to determine the residence time of the transmission data,
It is described that a request amount and a stay time, which are transmission data amounts, are notified to a wireless base station. The wireless base station that has received the request amount and the residence time notifies the wireless terminal of a use channel instruction (communication band allocation).

FIG. 5 illustrates that the wireless terminal obtains the required amount for the dwell time by the method of FIG. 6 and notifies the wireless base station of the required amount of data to be transmitted and the dwell time. The wireless base station that has received the request amount and the residence time notifies the wireless terminal of a use channel instruction (communication band allocation).

As a method of notifying the required amount and the dwell time to the radio base station as described in FIG. 5 and, it is not necessary to notify all the requested amount and the dwell time. A notification may be made of the residence time corresponding to the data and the requested amount corresponding to the transmission data having the minimum residence time. As a result, the amount of information to be notified can be small. Such a required amount and a residence time can be realized by embedding them as information elements of an air message.

FIG. 5 illustrates that the required amount of residence time is determined in the radio base station by the method of FIG. Then, the wireless base station notifies the wireless terminal of a use channel instruction (communication band allocation).

FIG. 5 illustrates a portion for measuring the dwell time for transmission data from the radio base station to the radio terminal.

FIG. 5 shows a case where the radio base station records the transmission data generation time in the radio base station in the header of the transmission data and controls the transmission data at least when the transmission data is generated. It is described that the residence time of transmission data is obtained by comparing the time for performing control on data with the occurrence time. Then, the wireless base station notifies the wireless terminal of a use channel instruction (communication band allocation).

FIG. 5 illustrates that the required amount for the residence time is determined in the radio base station by the method of FIG. Then, the wireless base station notifies the wireless terminal of a use channel instruction (communication band allocation).

FIG. 6 is a sequence diagram of a method for measuring the relationship between the amount of transmission data and the dwell time in the radio base station when data is transmitted from the radio terminal to the radio base station. Here, t represents the residence time, and is incremented by one at regular intervals (broken line). I represents the amount of transmission data. Therefore, I [t] represents the transmission data amount during the stay time t.

For example, in the case of a wireless communication system in which a plurality of connections can be established for one wireless terminal and different services can be provided for each connection, a plurality of connections for providing the same kind of service are established for each established connection. The residence time is measured in one unit.

First, transmission data having a data amount of 10 is generated in the wireless terminal (I = 10). Then, the wireless terminal notifies the wireless base station of the request amount 10. The wireless base station transmits the data amount I [0] when the residence time of the wireless terminal is t = 0.
Is 10. Next, it is assumed that the wireless base station notifies the wireless terminal of the assigned amount of five.
Therefore, the remaining data amount is I [0] = 10−5 = 5. When a certain period elapses, t is incremented by 1 and I
[1] = 5. Here, the wireless terminal can transmit the data amount 5 to the wireless base station.

Next, a data amount 1 is newly generated in the wireless terminal. Therefore, I = 6. Then, the wireless terminal notifies the request amount 6 to the wireless base station. The radio base station
The data amount of the new residence time 0 is I [0] = 6-5 = 1, and I [1] + I [0] corresponds to the request amount from the wireless terminal. Next, it is assumed that the wireless base station notifies the wireless terminal of the assigned amount of 3. Therefore, I [1] = 5-3 = 2 for the longer residence time. When a certain period has elapsed, t is incremented by 1, and I [2] = 2 and I
[1] = 1. Here, the wireless terminal can transmit the data amount 3 to the wireless base station.

Next, a data amount 1 is newly generated in the wireless terminal. Therefore, I = 4. Then, the wireless terminal notifies the wireless base station of the request amount 4. The radio base station
The data amount of the new residence time 0 is represented by I [0] = 4-2-1 =
1 and I [2] + I [1] + I [0] correspond to the request amount from the wireless terminal. Next, it is assumed that the wireless base station notifies the wireless terminal of the assigned amount of 2. Therefore,
For the longer residence time, I [2] = 2-2 = 0. Here, the wireless terminal can transmit the data amount 2 to the wireless base station. Eventually, at this point, the data amount of the residence time 1 is 1 (I [1] = 1), and the data amount of the residence time 0 is 1 (I [0] = 1).

According to such a procedure, the staying time can be measured and used to determine the priority when radio resources are allocated.

The amount of transmission data required as a trigger for determining the priority when allocating radio resources is a required amount.
Note that when the transmission data amount becomes 0, that is, the last I in FIG.
In the case of [2] = 0, it is also preferable to save the memory by deleting the registration of I [2]. When data is transmitted from a wireless terminal to a wireless base station or from a wireless base station to a wireless terminal, the residence time can be obtained on each transmitting side in a manner similar to the method of FIG. In this case, the request amount in FIG. 6 is stored in the transmission buffer and replaced with the transmission data amount, and the staying time and the request amount for the staying time can be obtained based on the transmission data amount. Further, when the wireless terminal is on the transmitting side, the scheduler of the wireless base station can know the staying time by notifying at least the maximum value of the staying time to the wireless base station.

In the above, one embodiment in a wireless communication system has been described. However, various changes, modifications, and omissions of the scope of the technical idea and viewpoint of the present invention can be easily performed by those skilled in the art. The foregoing description is merely an example, and is not intended to be limiting. For example, even in a wired communication system stretched like a net such as the Internet, the required amount and the allocated amount can be considered as the number of link connections. Therefore, the present invention
It is limited only as defined by the appended claims and equivalents thereof.

[0053]

FIG. 7 is a graph showing a simulation result calculated using an on / off burst model. FIG. 7 shows the average value of the throughput of the wireless terminal with respect to the average transmission capacity of the wireless terminal. Compared to the method of allocating all in order from the wireless terminal having the transmission data having a large transmission data amount, the present invention which uses the method only when the dwell time exceeds the threshold value is used when the transmission data amount is small. The effect is large, and the effect is not particularly seen when the transmission data amount is large. This is because the present invention gives priority to a wireless terminal whose residence time does not exceed the threshold value for a small transmission data amount, so that a large transmission data amount does not improve the throughput. can not see. However, considering that the number of wireless terminals having a small transmission capacity is larger than the number of wireless terminals having a large transmission capacity, such a result is considered preferable in terms of service provision.

From FIG. 7, it can be seen that the method of setting the buffer × delay as the priority improves the throughput of the radio terminal. Furthermore, the method in which the buffer / delay is prioritized, compared with the case where only the transmission data amount is considered,
The improvement effect is high for a wireless terminal having a small transmission data amount. Even if a method of increasing the priority order from the smallest transmission data amount is used, it is considered that the greater the traffic amount, the higher the effect of the present invention considering the delay at the same time.

For example, in FIG. 7, the threshold value is set to two frames (the count-up for measuring the dwell time is performed for each frame) so that the achievement rate showing the effect is not largely influenced by the transmission amount. . If this threshold value is set to a large value, the achievement rate of the user with a small transmission amount increases, and the user with a large transmission amount receives a disadvantageous service.

As described above in detail, the communication band allocating method of the present invention more efficiently averages the throughput of the communication devices in the system as compared with the conventional method considering only the amount of transmission data. Can be provided.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an embodiment in which the present invention is used.

FIG. 2 is a flowchart of an embodiment of a communication band allocating method according to the present invention.

FIG. 3 is a flowchart of another embodiment of a communication band allocating method according to the present invention.

FIG. 4 is a method for measuring residence time according to the present invention.

FIG. 5 is a diagram for explaining a part for measuring a residence time of transmission data in the communication band allocating method according to the present invention.

FIG. 6 is a sequence diagram of a method for measuring a dwell time and a transmission data amount according to the present invention.

FIG. 7 is a graph showing a simulation result calculated using an on / off burst model.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinya Otsuki 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Inside Japan Telegraph and Telephone Corporation (72) Inventor Toru Terashima 1-9-1, Konan, Minato-ku, Tokyo NTT Communicationware Co., Ltd. F-term in the company (reference) 5K067 AA13 DD11 DD34 DD51 EE02 EE10 EE65 HH22 HH23 JJ12 JJ21 KK15

Claims (10)

[Claims] 1. A communication band allocation method performed when a first communication device communicates with a plurality of second communication devices, wherein a transmission data within the first communication device and / or the second communication device For one or more of the second communication devices having transmission data longer than a predetermined residence time, the communication band is sequentially changed from the second communication device having the transmission data having longer residence time. Allocating, and then allocating a communication band to the one or more second communication devices that have not been allocated in the step, in order from the second communication device having the transmission data having a small transmission data amount. And a communication band allocating method. 2. A communication band allocating method performed when a first communication device communicates with a plurality of second communication devices, wherein transmission data in the first communication device and / or the second communication device is transmitted. Allocating a communication band to the second communication device in descending order of a product or a sum of the staying time and the amount of transmission data. 3. A communication band allocating method performed when a first communication device communicates with a plurality of second communication devices, wherein a transmission data in the first communication device and / or the second communication device is provided. A communication band allocation step in which the communication band is allocated in order from the second communication device having a smaller ratio between the staying time and the transmission data amount. 4. The transmission data transmitted from the second communication device to the first communication device, wherein the second communication device sets an occurrence time of the transmission data in the second communication device,
Recording in the header of the transmission data, and when controlling the transmission data, comparing at least the time for performing control on the transmission data that occurred at least earliest with the generation time, 4. The method according to claim 1, further comprising: determining the staying time; and notifying the first communication device of a request amount and a staying time that are transmission data amounts. 5. Communication bandwidth allocation method. 5. The transmission data transmitted from the second communication device to the first communication device, the second communication device notifies the second communication device of a request amount In, and the request amount In The residence time t of I [t] to I [0] is incremented by 1 (I [t +
1] to I [1]), the value obtained by subtracting the information ΣI [t] from the required amount In is stored in I [0], and the allocated amount Ia to be allocated to the second communication device is obtained. [T + 1]
Subtracting the allocated amount Ia in order from I to [0] to obtain the required amount for the dwell time t; and notifying the first communication device of the required amount and the dwell time as the transmission data amount. The communication band allocating method according to claim 1, further comprising: 6. The step of notifying the first communication device of the request amount and the residence time includes at least a residence time corresponding to transmission data having a maximum residence time and a request corresponding to transmission data having a minimum residence time. 6. The communication band allocating method according to claim 4, wherein the amount is notified. 7. The transmission data transmitted from the second communication device to the first communication device, the first communication device is notified of a request amount In from the second communication device, and the request amount In The residence time t of I [t] to I [0] is incremented by 1 (I [t
+1] to I [1]), information {I [t] from the requested amount In.
Is held in I [0], an allocation amount Ia to be allocated to the second communication device is obtained, and the requested amount I [t +
The communication bandwidth allocation method according to any one of claims 1 to 3, wherein the allocation amount Ia is sequentially subtracted from 1] to I [0] to obtain the required amount for the stay time t. 8. Regarding transmission data transmitted from the first communication device to the second communication device, the first communication device sets an occurrence time of the transmission data in the first communication device,
Recording in the header of the transmission data, and when controlling the transmission data, comparing at least the time for performing control on the transmission data that occurred at least earliest with the generation time, Determining the residence time.
The communication band allocation method according to any one of the above. 9. The transmission data transmitted from the first communication device to the second communication device, wherein the first communication device generates transmission data of a transmission data amount In in the first communication device. Then, the dwell time t of the transmission data amount I [t] to I [0] is incremented by 1 (I [t + 1] to I [1]), and the value obtained by subtracting the information ΣI [t] from the transmission data amount In is obtained. I [0]
Allocated to the second communication device and allocated to the second communication device
4. The transmission data amount for the stay time t is obtained by sequentially subtracting the allocation amount Ia from the request amount I [t + 1] to I [0]. Communication bandwidth allocation method according to the paragraph. 10. The wireless communication system according to claim 1, wherein the first communication device is a wireless base station, and the second communication device is used in a wireless communication system that is a wireless terminal. 3. The communication band allocation method according to 1.