KR101047860B1 - Communication system, base station and method for controlling the base station - Google Patents

Abstract

PURPOSE: A communication system, base station, and communication control method thereof are provided to minimize interference between relays within a cell and to efficiently utilize the frequency-time resources. CONSTITUTION: A communication unit(310) receives location information from mobile relays within a cell area of a base station. The communication unit transmits resource scheduling information to mobile relays. A control unit(320) generates resource scheduling information about mobile relays. The control unit generates the resource scheduling information.

Description

Communication system, base station and method for controlling the base station

One embodiment of the present invention relates to a communication system, a base station and a communication control method of a base station, and more particularly, to efficiently reduce interference between a plurality of mobile relays located adjacent to each other in a cell, and to efficiently reduce frequency-time resources. The present invention relates to a communication system, a base station constituting a communication system, and a communication control method of a base station.

Mobile Mutil-hop Relay (Mobile Multi-hop Relay) technology is being researched as a technology for expanding cell capacity and cell area in a wireless mobile communication system. In particular, multi-hop technology that can provide mobile Internet services to WiBro (Mobile WiMAX) at high speed is being standardized in IEEE 802.16j.

There are fixed and mobile relays. Mobile relays can cause various problems in the implementation of multi-hop relay technology. Among these, interference between mobile relays is an important problem.

Interference refers to a phenomenon in which communication with a terminal belonging to each relay is disturbed when a plurality of relays using the same frequency are adjacent to each other.

As shown in FIG. 1, when the plurality of relays 121, 122, and 123 relaying data communication between the base station 110 and the terminal 130 are adjacent to each other by movement, the terminal 130 exists in each of the terminals 130. Interference may occur between them.

Specifically, when the plurality of relays 121, 122, and 123 use the same frequency-time resource, they may cause serious interference to each other, thereby preventing data from being properly transmitted to terminals belonging to the mobile relay.

The frequency-time resource refers to a limited resource given by the base station as a resource used by the plurality of mobile relays 121, 122, and 123 in the cell 115 to transmit data to the terminal 130.

To avoid such interference, IEEE 802.16j introduces a data transmission method by a central control and a data transmission method by a distributed control as a method of transmitting data to a terminal by a relay.

Among them, the data transmission method by the central control solves the problem of interference by using a plurality of mobile relays belonging to the cell region by dividing the frequency-time resources without overlapping each other. However, when the mobile relay having a small frequency radius is far from each other, even if the same frequency-time resources are used, even if interference does not occur, the frequency-time resources are divided and used, which causes a problem in that the efficiency of resource utilization decreases.

As a conventional technique for solving the efficiency problem of frequency-time resource utilization, a technique called RS Grouping is described in IEEE 802.16j. When the mobile relays are in close proximity to each other, an interference phenomenon occurs. In this case, the mobile relays causing interference are grouped to use frequency-time resources. The procedure of the technique is as follows.

First, the base station enables neighbor station discovery through the MR_NBR-INFO message to the mobile relay. The mobile relay also obtains the neighbor monitoring scheme parameters through the RS Config CMD message, measures the surrounding signals, and sends these measurements to the base station via RS_MESA-REP. Based on this information, the base station determines which mobile relays form a group, performs RS grouping, and allocates frequency-time resources to the grouped mobile relays.

However, in the RS grouping method, a situation may occur before the location information exchanged between the base station and the relay is reflected in the RS grouping according to the characteristics of the mobile relay having a small propagation radius and high mobility. In this case, incorrect location information is reflected in RS Grouping, and there is a fear that interference is more severe.

As shown in FIG. 2A, a plurality of mobile relays in a cell area are RS Grouping into Group A 201 and Group B 202. Each of the mobile relays uses frequency-time resources by dividing as shown in Fig. 2 (b).

However, when the first mobile relay 121 moves to group B 202 in a rapid movement and the position information of the first mobile relay 121 is not reflected in RS Grouping, the first mobile relay 121 is a group A 201. ) Will use the allocated frequency-time resources.

Therefore, as shown in FIG. 2 (c), the frequency-time resource used by the first mobile relay 121 overlaps some of the frequency-time resources used by the second mobile relay 122, thereby causing interference.

Therefore, the need for a technique for efficiently utilizing frequency-time resources while reducing interference between relays is increasing.

In order to solve the problems of the prior art as described above, in the present invention, a communication system capable of minimizing interference among a plurality of mobile relays and efficiently utilizing frequency-time resources, communication control of a base station constituting a communication system and a base station I would like to suggest a method.

According to an embodiment of the present invention to achieve the above object, in the base station, receiving the position information of each of the plurality of mobile relays in the cell area of the base station from the plurality of mobile relays, Communication unit for transmitting the resource scheduling information to the mobile relays of the; And a controller for generating resource scheduling information for each of the plurality of mobile relays, wherein the cell region of the base station is divided into a plurality of first groups based on location, and a first frequency-time resource is set in each group. And a second frequency-time resource in which each first group is divided into n second groups (where n is a natural number of 2 or more) on a location basis, and the first frequency-time resource is divided into n in each second group. Is set, the control unit is provided with a base station for identifying the first group and the second group corresponding to the location information of each of the plurality of mobile relay to generate the resource scheduling information.

In this case, the resource scheduling information includes frequency-time resource information set in the plurality of mobile relays, and when the plurality of mobile relays exist in a k-th (1 ≦ k ≦ n) second group, the k-th Resource scheduling information is generated by dividing a second frequency-time resource set in a second group by the number of mobile relays and allocating a third frequency-time resource to each of the plurality of mobile relays.

In addition, according to another embodiment of the present invention, a plurality of mobile relays; And receive location information of each of the plurality of mobile relays in a cell area from the plurality of mobile relays, transmit resource scheduling information to each of the plurality of mobile relays, and resource for each of the plurality of mobile relays. And a base station for generating scheduling information, wherein the cell region of the base station is divided into a plurality of first groups based on location, each group is configured with a first frequency-time resource, and each of the first groups is based on n A second frequency-time resource is divided into a second group (where n is a natural number of two or more), and each second group is configured with a second frequency-time resource in which the first frequency-time resource is divided into n. The resource system may generate the resource scheduling information by identifying a first group and a second group corresponding to location information of each relay. It is.

In addition, according to another embodiment of the present invention, the step of receiving the position information of each of the plurality of mobile relays in the cell area of the base station from the plurality of mobile relays; Generating resource scheduling information for each of the plurality of mobile relays; And transmitting the generated resource scheduling information to the plurality of mobile relays, wherein the cell region of the base station is divided into a plurality of first groups based on location, and a first frequency-time resource is set in each group. Each first group is divided into n second groups (where n is a natural number of 2 or more) on a location basis, and each second group includes a second frequency-time resource obtained by dividing the first frequency-time resource. In the step of generating resource scheduling information, a communication control method of a base station for generating the resource scheduling information by identifying a first group and a second group corresponding to location information of each of the plurality of mobile relays is provided.

According to the present invention, interference between a plurality of relays located adjacent to each other in a cell can be minimized and frequency-time resources can be efficiently utilized.

1 is a diagram illustrating a schematic configuration of a communication system including a plurality of relays.
2 is a diagram illustrating a problem of a frequency-time resource allocation method of a conventional mobile relay.
3 is a block diagram showing a detailed configuration of a base station according to an embodiment of the present invention.
4 is a diagram illustrating a method for allocating grouping and frequency-time resources for a cell region.
FIG. 5 is a diagram illustrating a method of allocating frequency-time resources when a plurality of mobile relays exist in any one of a plurality of second groups.
6 is a diagram illustrating a process of generating resource scheduling information in a base station according to an embodiment of the present invention.
7 illustrates a process in which mobile relays communicate with a base station to determine frequency-time resources by themselves.
FIG. 8 is a diagram for describing a process of performing power control to increase efficiency of frequency-time resources allocated to a mobile relay according to one embodiment of the present invention.
9 is a diagram illustrating an interference problem that may occur when a position of a mobile relay changes abruptly according to an embodiment of the present invention.
10 is a flowchart illustrating the overall flow of a communication control method of a base station according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the embodiments. Like reference numerals in the drawings denote like elements.

1 is a diagram illustrating a schematic configuration of a communication system including a plurality of relays.

In the cell 115 region of the base station 110, a plurality of relays 121, 122, and 123 relaying data communication with the terminal 130 exist.

The terminal 130 may perform direct communication with the base station 110, but if the channel state of the base station 110 is poor, the terminal 130 performs communication through the relays 121, 122, and 123.

That is, a multi-hop relay technique is used in which the terminal 130 is located outside the area of the cell 115 or communicates with the terminal 130 by using the mobile relays 121, 122, and 123 in a shaded area that is heavily shielded by a building. do.

Accordingly, the base station 110 may provide data at a high speed in a cell boundary region in which channel conditions are poor, and may expand the cell 115 region.

If the mobile relays 121, 122, 123 are mobile relays, when the plurality of relays 121, 122, 123 are temporarily gathered in one place, interference may occur when the frequency-time resources used by the plurality of relays 121, 122, 123 are the same.

Hereinafter, the mobile relays 121, 122, and 123 will be described in such a manner as to effectively reduce the interference between the plurality of mobile relays 121, 122, and 123 in the cell 115 on the premise that the propagation radius is small and the mobility is large.

3 is a block diagram showing a detailed configuration of a base station according to an embodiment of the present invention.

Referring to FIG. 3, the base station 110 according to an embodiment of the present invention includes a communication unit 310 and a control unit 320. Hereinafter, the function of each component will be described in detail.

The communicator 310 includes a receiver 312 and a transmitter 314. The receiver 312 and the transmitter 314 perform wireless communication with the plurality of mobile relays. That is, the receiver 312 receives a radio signal from the plurality of mobile relays 320 and the transmitter 314 transmits a radio signal to the plurality of mobile relays.

The radio signal may include location information transmitted from the plurality of mobile relays 121, 122, and 123 and resource scheduling information transmitted from the base station 110.

The resource scheduling information means information on frequency-time resources allocated to each of the plurality of mobile relays 121, 122, and 123.

The controller 320 determines the frequency-time resources set in the plurality of mobile relays 121, 122, and 123 to generate resource scheduling information.

That is, the base station 110 according to an embodiment of the present invention divides the area of the cell 115 based on location to remove interference that may occur between the plurality of mobile relays 121, 122, and 123, and based on the divided groups. Generates scheduling information.

According to an embodiment of the present invention, the cell 115 region is divided into a plurality of first groups based on location, and a first frequency-time resource is set in each group. Each of the divided first groups is set with the same first frequency-time resource.

Each of the first groups is divided into n second groups based on location, and a second frequency-time resource in which the first frequency-time resource is divided into n is set in each second group. N is a natural number of two or more.

As described above, the grouping of the cell 115 regions is intended to prevent a frequency collision even when each mobile relay moves quickly while minimizing interference of the plurality of mobile relays 121, 122, and 123.

The control unit 320 generates resource scheduling information for each mobile relay 121, 122, 123 by identifying the frequency-time resource information in the divided first group and the second group and location information received from the plurality of mobile relays 121, 122, 123. do.

Hereinafter, a method of allocating grouping and frequency-time resources for the cell 115 region will be described in detail with reference to FIGS. 4 and 5.

4 is a diagram illustrating a method for allocating grouping and frequency-time resources for a cell region.

Referring to FIG. 4A, the cell 115 is divided into a plurality of first groups based on positions. The number of groups to be divided may be variously determined.

The same first frequency-time resource is set for each first group. That is, each first group can use all frequency-time resources given by the base station, and thus can efficiently use frequency-time resources rather than dividing the frequency-time resources by the number of mobile relays in the cell 115 region.

According to an embodiment of the present invention, the first group is divided into n second groups, and each second group is allocated a second frequency-time resource in which the first frequency-time resource is divided into n.

For example, when the first group according to the present exemplary embodiment is divided into four second groups A to D, each of the second groups corresponds to each position as shown in FIG. 4 (c). 2 frequency-time resources are set.

Although FIG. 4C illustrates that the first frequency-time resource is divided into frequency bands to set the second frequency-time resource, the present invention is not limited thereto, and the same frequency may be divided based on time.

In addition, although FIG. 4 illustrates a state in which one first group 410 is divided into four second groups 430 to 436, the division into four second groups is merely an example for explaining the present invention. It is also possible to divide into more numbers.

As such, when the second frequency-time resource is set, different second frequency-time resources may be set between second groups belonging to adjacent first groups.

For example, the second group B 432 of the first group A 410 and the second group A 430 of the first group B 412 adjacent to the first group A 410 may be allocated with different frequency-time resources. Interference is removed between the mobile relay 121 and the second mobile relay 122.

FIG. 5 is a diagram illustrating a method of allocating frequency-time resources when a plurality of mobile relays exist in any one of a plurality of second groups.

Referring to FIG. 5A, a first mobile relay 121, a second mobile relay 122, and a third mobile relay 123 exist in the second group D 436. The control unit 320 transmits the second frequency-time to the first mobile relay 121, the second mobile relay 122, and the third mobile relay 123 belonging to the second group D 436 as shown in FIG. 5B. Interference is removed by setting a third frequency-time resource obtained by dividing the resource.

The allocation of frequency-time resources is determined according to the number of mobile relays belonging to each second group.

The method of allocating the frequency-time resource to the mobile relay includes a method of allocating by the control unit 320 and a method of allocating the mobile relay through communication between the mobile relays.

Hereinafter, a process (resource scheduling generation process) of allocating frequency-time resources to the mobile relay will be described in detail with reference to FIGS. 6 and 7.

6 is a diagram illustrating a process of generating resource scheduling information in a base station according to an embodiment of the present invention. Hereinafter, a process performed step by step with reference to FIG. 6, and FIG. 6 will be described based on the communication between the base station 110 of FIG. 1 and the first and second mobile relays 121 and 122. .

In step S640, the base station 110 transmits an MR_LOC_REQ message to the first mobile relay 121.

The MR_LOC_REQ message is a message for requesting location information on a mobile relay belonging to an area of the cell 115 of the base station 110.

In operation S642, the first mobile relay 121 transmits an MR_LOC_RSP message to the base station 110.

The MR_LOC_REQ message is a message including location information on the mobile relay belonging to the cell 115 region of the base station 110.

In step S644, the base station 110 transmits an MR_LOC_REQ message to the second mobile relay 122.

In operation S646, the second mobile relay 122 transmits an MR_LOC_RSP message to the base station 110.

In step S648, the base station 110 generates resource scheduling information for the first mobile relay 121 and the second mobile relay 122.

As described above, the cell region 115 is divided into a plurality of first groups and second groups, and different frequency-time resources are set in each divided second group. In step S648, the base station 110 identifies the second group to which the first mobile relay 121 and the second mobile relay 122 belong, and thus, the first mobile relay 121 and the second mobile relay 122 for the first mobile relay 121 and the second mobile relay 122. Allocates frequency-time resources.

If the first mobile relay 121 and the second mobile relay 122 belong to the same first group and the second group, the base station 110 divides each of the frequency-time resources set in the second group. Resource scheduling information for the mobile relays 121 and 122 is generated.

In step S650, the base station 110 transmits the resource scheduling information for the generated first mobile relay 121 to the first mobile relay 121.

In step S652, the base station 110 transmits the resource scheduling information for the generated second mobile relay 122 to the second mobile relay 122.

According to an embodiment of the present invention, location information transmission of the mobile relays 121 and 122 may be performed periodically. Further, according to another embodiment, when the second group to which the mobile relays 121 and 122 belong to is changed, the mobile relays 121 and 122 may transmit their own location information, and the base station 110 may move. Resource scheduling information for the mobile relays 121 and 122 and the mobile relays affected by the movement of the mobile relays 121 and 122 may be generated.

In FIG. 6, only the process of allocating frequency-time resources to the first mobile relay 121 and the second mobile relay 122 by the base station 110 is described for convenience of description, but this is the cell 115 of the base station 110. The same can be applied to all mobile relays belonging to the domain.

7 illustrates a process in which mobile relays communicate with a base station to determine frequency-time resources by themselves. FIG. 7 illustrates a process that is performed when the position information of the first mobile relay 121 is changed to change the second group to which the first mobile relay 121 belongs, and also the second movement to the changed second group. It is assumed that the relay 122 is located.

Referring to FIG. 7, in step S700, the first mobile relay 121 transmits location information of the first mobile relay 121 to the base station 110.

In step S702, the base station 110 transmits a response message to the first mobile relay 121.

The response message includes information on the first group to which the first mobile relay 121 belongs, information on the second group, and information on at least one or more mobile relays located in the second group. The information on the second frequency-time resource information set in the second group.

In step S704, the first mobile relay 121 generates resource scheduling information.

The resource scheduling information is generated by dividing the frequency-time resource set in the second group by the number of mobile relays belonging to the second group among the response messages received in step S702.

In step S706, the first mobile relay 121 transmits the resource scheduling information generated in step S704 to the second mobile relay 122.

According to another embodiment of the present invention, the mobile relay can determine the frequency-time resource by itself by communicating with another mobile relay of the second group to which it belongs.

As described above, the cell region 115 is divided into first and second groups on a location basis, and a second frequency-time resource is set for each second group. Accordingly, the mobile relay moving to a specific second group may recognize the second frequency-time resource that it should use, and then communicate with another mobile relay of the second group to which it belongs to share the second frequency-time resource. Can be used separately.

FIG. 8 is a diagram for describing a process of performing power control to increase efficiency of frequency-time resources allocated to a mobile relay according to one embodiment of the present invention.

Referring to FIG. 8A, a first mobile relay 121 and a second mobile relay 122 exist in the second group D 436. In this case, a problem may occur when the amount of data to be transmitted from the first mobile relay 121 to the terminal 130 is greater than the amount of data that can be transmitted in a given frequency-time resource. In order to make up for the shortcomings of the frequency-time resource efficiency, a power control method described below is used.

Referring to FIG. 8B, the first mobile relay 121 uses a part of frequency-time resources of the second group D 436. When the frequency-time resource used by the first mobile relay 121 is insufficient to transmit data to the terminal 130, the second group A 430 and the second group B 432 except the second group D 436. ), Some of the frequency-time resources used by the second group C 434 may be randomly selected (for example, another frequency band of another second group) to transmit data.

For example, when the first mobile relay 121 randomly selects the frequency band of the second group C 434, the first mobile relay 121 uses the selected frequency band at low power.

The reason for using a randomly selected frequency-time resource at low power is to narrow the radio wave radius.

Specifically, if the randomly selected frequency-time resource is the same as the frequency-time resource used by the third mobile relay 123 of the second group C 434, the third mobile relay 123 is the first mobile relay 121. ), Interference may occur due to the use of the same frequency-time resource.

Therefore, if the radio wave radius is narrowed by transmitting a randomly selected frequency-time resource at low power, the use of the frequency-time resource of the third mobile relay 123 can be protected.

9 is a diagram illustrating an interference problem that may occur when a position of a mobile relay changes abruptly according to an embodiment of the present invention.

As described with reference to FIG. 2, in the related art, interference occurs when the mobile relay changes rapidly and the location information is not reflected in the RS grouping.

Referring to FIG. 9A, the first group A 410 is divided into four second groups 430 to 436, and one or more mobile relays exist in each second group.

Mobile relays belonging to each of the second group are allocated frequency-time resources as shown in FIG.

When the first mobile relay 121 belonging to the second group A 430 moves to the second group B 432 in rapid movement, the first mobile relay 121 may not be allocated the changed resource scheduling information of the base station. As a result, the first mobile relay 121 may temporarily use the frequency allocated by the second group A 430 in the second group B 432.

However, unlike the prior art, in the present invention, even if the first mobile relay 121 moves to the second group B 432 and uses the previously allocated frequency-time resource, as shown in FIG. Since the frequency-time resources used by the first mobile relay 121 of the group A 430 and the second mobile relay 122 of the second group B 432 are different, interference does not occur. Therefore, the interference problem caused by the sudden change of position of the mobile relay is solved.

10 is a flowchart illustrating the overall flow of a communication control method of a base station according to an embodiment of the present invention. Hereinafter, a process performed step by step with reference to FIG. 10.

In step S1010, location information of each of the plurality of mobile relays in the cell area of the base station is received from the plurality of mobile relays.

In operation S1020, resource scheduling information for each of the plurality of relays is generated. The cell area of the base station is divided into a plurality of first groups on a location basis, and a first frequency-time resource is set in each group, and each first group is divided into n second groups on a location basis, and each second group The second frequency-time resource, in which the first frequency-time resource is divided into n, is set. In order to generate the resource scheduling information, the first group and the second group corresponding to the location information of each of the plurality of mobile relays are identified to generate resource scheduling information which is information for allocating frequency-time resources to the plurality of mobile relays. .

In step S1030, resource schedule information is transmitted to the plurality of mobile relays.

The embodiments of the communication control method of the base station according to the present invention have been described so far, and the configuration of the base station described with reference to FIGS. 2 to 9 can be applied to the present embodiment as it is. Hereinafter, a detailed description will be omitted.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions. Therefore, the spirit of the present invention should not be limited to the described embodiments, and all of the equivalents and equivalents of the claims, as well as the following claims, will fall within the scope of the present invention. .

110: base station 115: cell
121: first mobile relay 122: second mobile relay
123: third mobile relay 130: terminal
201: Group A 202: Group B
310: communication unit 312: receiving unit
314: transmission unit 320: control unit
410: first group A 412: first group B
430: second group A 432: second group B
434: Second group C 436: Second group D

Claims (13)

In the base station,
A communication unit for receiving location information of each of the plurality of mobile relays in the cell area of the base station from the plurality of mobile relays and transmitting resource scheduling information to the plurality of mobile relays; And
A control unit for generating resource scheduling information for each of the plurality of mobile relay,
The cell region of the base station is divided into a plurality of first groups on a location basis, and a first frequency-time resource is set in each group, and each first group is n second groups on a location basis, where n is two or more. A second frequency-time resource in which the first frequency-time resource is divided into n is set in each second group.
The control unit is a base station for generating the resource scheduling information by identifying the first group and the second group corresponding to the location information of each of the plurality of mobile relay. The method of claim 1,
The base station, characterized in that different frequency bands are set in the n second group. The method of claim 1,
When there are a plurality of mobile relays in the k-th (1 ≦ k ≦ n) second group, the controller divides the second frequency-time resource set in the k-th second group by the number of the plurality of mobile relays. And assigning a third frequency-time resource to each of the plurality of mobile relays. The method of claim 1,
The communication unit periodically receives the location information from the plurality of mobile relays,
The control unit periodically generates the resource scheduling information for the plurality of mobile relays based on the location information. The method of claim 1,
The communication unit receives the location information from the first mobile relay that is changed to the second group to which it belongs by moving the location,
And the controller generates resource scheduling information for one or more mobile relays belonging to a second group in which the first mobile relay is currently located. The method of claim 1,
The first mobile relay belonging to the k-th (1 ≦ k ≦ n) second group determines that the second frequency-time resource allocated to the k-th second group is not sufficient to transmit data to the mobile terminal. If at least one of the second frequency-time resources allocated to the other second group. The method of claim 6,
And the first mobile relay uses the randomly selected second frequency-time resource at a power lower than a predetermined value. The method of claim 1,
A base station, characterized in that different frequency-time resources are set in a second group adjacent to each other among the n second groups. In the mobile relay,
A communication unit for transmitting location information of the mobile relay to a base station, and receiving first group information, second group information, and at least one or more second mobile relay information located in the second group from which the mobile relay belongs; And
And a controller configured to generate resource scheduling information for the mobile relay using at least one of the first group information, the second group information, and the second mobile relay information.
The cell region of the base station is divided into a plurality of first groups on a location basis, and a first frequency-time resource is set in each group, and each first group is n second groups on a location basis, where n is two or more. And a second frequency-time resource in which the first frequency-time resource is divided into n is set in each second group.
Mobile relay, characterized in that. 10. The method of claim 9,
And the first group information and the second group information include the first frequency-time resource information and the second frequency-time resource information of a second group to which the mobile relay belongs. 10. The method of claim 9,
The resource scheduling information is a third frequency-time resource for the mobile relay,
The control unit sets the third frequency-time resource by dividing a second frequency-time resource of a second group to which the mobile relay belongs based on the number of the second mobile relays. A plurality of mobile relays; And
Receive position information of each of the plurality of mobile relays in a cell area from the plurality of mobile relays, transmit resource scheduling information to each of the plurality of mobile relays, and resource scheduling for each of the plurality of mobile relays. Include a base station generating information,
The cell region of the base station is divided into a plurality of first groups on a location basis, and a first frequency-time resource is set in each group, and each first group is n second groups on a location basis, where n is two or more. A second frequency-time resource in which the first frequency-time resource is divided into n is set in each second group.
The base station identifies the first group and the second group corresponding to the location information of each of the plurality of mobile relay to generate the resource scheduling information. In the communication control method of the base station,
Receiving location information of each of the plurality of mobile relays in the cell area of the base station from the plurality of mobile relays;
Generating resource scheduling information for each of the plurality of mobile relays; And
Transmitting the generated resource scheduling information to the plurality of mobile relays,
The cell region of the base station is divided into a plurality of first groups on a location basis, and a first frequency-time resource is set in each group, and each first group is a second group on a location basis, where n is a natural number of two or more. And a second frequency-time resource in which the first frequency-time resource is divided into each second group.
The generating of the resource scheduling information may include identifying a first group and a second group corresponding to location information of each of the plurality of mobile relays and generating the resource scheduling information.

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