JP2011071993A - Inter-cell resource scheduling method, base station, user equipment and mobile communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide: an inter-cell resource scheduling method for improving the throughput of a system; a base station; user equipment; and a mobile communication system. <P>SOLUTION: For the user equipment, the method includes a step of selecting a first cell in a resource block and a step of calculating first throughput and second throughput, which can be achieved by utilizing the resource block when the user equipment in the resource block is in a mute mode and in a normal mode in the case of the cell edge user equipment of the first cell. Whether or not the first throughput is larger than N times of the second throughput is determined, and when it is larger than N times, the user equipment instructs the base station to which the first cell belongs to use the mute mode in the resource block. When it is not indicated that it is larger than N times, the base station to which the first cell belongs is instructed not to use the mute mode in the resource block. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to CoMP (Coordinated Multi-Point) transmission / reception technology in LTE-A of 3GPP, and more particularly to an inter-cell resource scheduling method, a base station, user equipment, and a mobile communication system.

  CoMP transmission / reception technology is a key technology for controlling inter-cell interference in LTE-A systems, and effectively controls or eliminates interference between adjacent cells by realizing joint transmission / reception between multiple cells. In particular, this is a key technology for improving cell edge user performance. Specifically, according to transmission technology complexity and feedback overhead, the above technology can be divided into cooperative scheduling, cooperative beamforming, and joint processing technology. The joint processing technique can be further divided into a joint transmission technique and a cell dynamic selection technique.

  In the cell dynamic selection technique, the signal is transmitted only from the selected base station, and the user needs to feed back only the channel information of the selected base station. Therefore, the cell dynamic selection technology is a technology that realizes constant inter-cell interference coordination with low transmission technology complexity and low user uplink channel feedback overhead. The transmission technology complexity, feedback overhead, and inter-cell interference coordination It is a relatively flexible technology that balances the effects.

  In the traditional cell dynamic selection technique, the user equipment determines, for each resource block RB (Resource Block), the downlink SNR on the resource block of each base station in the active set based on the downlink measurement value. calculate. Then, for each resource block, the base station with the maximum SNR is selected as the base station that transmits the downlink signal in the resource block, and the ID of the selected base station and the downlink channel information of the base station are transmitted to the service base station. Feedback is performed, and at the next signal transmission time, the selected base station transmits downlink data to the user in the resource block. In the traditional cell dynamic selection technique, for each resource block, a user can select a base station with the best channel quality and receive service at any time. Therefore, the performance of the system, particularly the performance of cell edge users can be greatly enhanced.

  In the discussion of LTE-A, a technique that combines muting with dynamic cell selection is also proposed. A technique combining muting with cell dynamic selection performs communication processing in the following steps.

  First, the cell edge user equipment is determined based on the downlink reference signal power values of the service base station measured by the user equipment and the adjacent base station having the strongest signal. When the difference between the serving base station and the downlink reference signal power value of the adjacent base station having the strongest signal is within a predetermined threshold (for example, 3 dB), it is determined that the user equipment is a cell edge user equipment.

  The cell edge user equipment then calculates the SNR when the cell with the second highest instantaneous power (ie, one of the neighboring cells) does not signal in the current resource block (Muting) based on the measured value. The measured value is fed back to the serving base station.

  Finally, based on the channel information fed back from the user and the cell selection situation, the central base station performs the joint scheduling algorithm for the users in all the cells until the allocation of the total power in any cell is completed. Allocate resource blocks with.

  When assigning resources, the cell edge user equipment of the first cell can be assigned only when both the same resource blocks of the first cell and the second cell are available. The second cell is a cell having the strongest signal received by the cell edge user equipment among neighboring cells of the first cell.

  In addition, when the cell edge user equipment is scheduled, in the resource block to be used, the serving base station transmits a signal with N times the power, but the cell with the second highest instantaneous power has a corresponding resource block. No signal transmission is performed in.

  The method of combining muting with cell dynamic selection has further enhanced the performance of cell edge users, but has at least the following drawbacks.

  Since the neighboring cell with the strongest signal does not transmit a signal in the corresponding resource block, although the performance of the cell edge user is improved, the resource of the neighboring cell is occupied, resulting in a decrease in system throughput.

  It is an object of the present invention to provide an inter-cell resource scheduling method, a base station, a user equipment, and a mobile communication system that increase the system throughput.

  To achieve the above object, an embodiment of the present invention provides an inter-cell resource scheduling method used in a mobile communication system based on CoMP transmission / reception, in which the user equipment performs cell dynamic selection. Based on the technology, the step 11 of selecting the first cell in the resource block and if the user equipment is a cell edge user equipment of the first cell, the user equipment in the resource block is in mute mode and normal mode. And calculating the first throughput and the second throughput that can be realized using the resource block in step 12 and determining whether or not the first throughput is greater than N times the second throughput. Step 13 for obtaining a determination result, where N is in mute mode, The number of base stations that provide wireless communication services to the user equipment, and the user equipment mutes the resource block when the determination result indicates that the first throughput is N times or more than the second throughput. Instruct the base station to which the first cell belongs to use the mode, and if the determination result does not indicate that the first throughput is greater than N times the second throughput, the mute mode is set in the resource block. Step 14 of instructing the base station to which the first cell belongs so as not to use it.

  In the inter-cell resource scheduling method, the user equipment further includes a step 15 of feeding back channel information of a downlink channel with the base station to which the first cell belongs to the serving base station.

  In step 11 of the inter-cell resource scheduling method, for the resource block, the user equipment calculates a downlink SNR in the resource block of each base station in an active set, and the user equipment Step 112 of selecting a base station with the maximum SNR including the first cell as a base station that transmits a downlink signal using the resource block, and the user equipment notifies the serving base station of the selected base station And step 113.

  In the inter-cell resource scheduling method described above, the base station performs step 16 of joint resource scheduling based on feedback from the user equipment, and the base station uses the power average value A / [B + (N−1) C−. D], where A: total transmission power of base station, B: total number of resource blocks of base station, C: number of resource blocks allocated to user equipment in mute mode, D: muted resources The number of blocks, the base station transmits a downlink signal with the first power that is the power average value for user equipment that is not in mute mode, and the second power that is N times the power average value for user equipment in mute mode. And a step 18 of transmitting a downstream signal with power.

  In order to achieve the above object, an embodiment of the present invention provides a user equipment used in a mobile communication system based on CoMP transmission / reception, in which the first in a resource block based on a cell dynamic selection technique. When the cell selection module for selecting a cell and the user equipment is the cell edge user equipment of the first cell, the user equipment in the resource block can be realized using the resource block in the mute mode and the normal mode. A throughput calculation module for calculating the first throughput and the second throughput, a determination module for determining whether or not the first throughput is greater than N times the second throughput, and obtaining a determination result, where N is the mute mode The number of base stations that provide wireless communication services to the user equipment. If the determination result indicates that the first throughput is greater than or equal to N times the second throughput, the base station to which the first cell belongs is instructed to use the mute mode in the resource block, and A feedback module for instructing the base station to which the first cell belongs to not use a mute mode in the resource block, if the determination result does not indicate that the first throughput is N times or more of the second throughput; including.

  In order to achieve the above object, an embodiment of the present invention further provides a base station used in a mobile communication system based on CoMP transmission / reception, in which joint scheduling of resources based on feedback from user equipment A resource joint scheduling module for performing power average value A / [B + (N−1) C−D], and A: total transmission power of the base station, B: base station Total number of resource blocks, C: number of resource blocks allocated to user equipment in mute mode, D: number of resource blocks muted, N: number of base stations providing wireless communication services to the user equipment in mute mode, For user equipment that is not in the mute mode, a downlink signal is transmitted with the first power that is the above average power value, and the The user equipment of Tomodo includes a transmission module for transmitting the downlink signal at a second power is N times the average power value.

  In order to achieve the above object, an embodiment of the present invention further provides a mobile communication system based on CoMP transmission / reception, including user equipment and a base station, wherein the user equipment is cell dynamic. If the user equipment is a cell edge user equipment of the first cell based on a selection technique and the user equipment is a cell edge user equipment of the first cell in the resource block, the user equipment is in mute mode and normal A throughput calculation module for calculating a first throughput and a second throughput that can be realized using the resource block in the mode; and determining whether or not the first throughput is greater than N times the second throughput. A determination module, wherein N is in mute mode and communicates wirelessly to the user equipment. The first cell so as to use the mute mode in the resource block when the determination result indicates that the first throughput is greater than or equal to N times the second throughput. Instruct the base station to which the first cell belongs, and if the determination result does not indicate that the first throughput is more than N times the second throughput, the first cell belongs to avoid using the mute mode in the resource block. A feedback module that instructs a base station to perform a resource joint scheduling module that performs joint scheduling of resources based on feedback from the user equipment, and a power average value A / [B + (N−1) ) CD] an average power calculation module for calculating : Total transmission power of base station, B: Total number of resource blocks of base station, C: Number of resource blocks allocated to user equipment in mute mode, D: Number of resource blocks muted, user equipment not in mute mode, A transmission module that transmits a downlink signal with the first power that is the average power value and transmits a downlink signal with a second power that is N times the average power value for user equipment in the mute mode.

  According to the embodiment of the present invention, the following beneficial effects can be obtained.

  An inter-cell resource scheduling method according to an embodiment of the present invention is used in a mobile communication system based on CoMP transmission / reception. After selecting a cell in a resource block based on a cell dynamic selection technique, the user equipment is in a mute mode. The mute mode is used in the resource block only when the throughput that can be realized by using the resource block in N is N times the throughput that can be realized by using the resource block in the normal mode by the user equipment. Therefore, the embodiment of the present invention is used to guarantee the quality of service to the user as much as possible and to increase the system throughput.

  In the embodiment of the present invention, the number of resource blocks that need to be transmitted with N times the power is added to the total number of resource blocks of the system to reduce the number of muted resource blocks. Since the transmission power is equally divided and the transmission power is allocated by the system power after the equal division, it is possible to guarantee that both the resource block of the system and the transmission power are sufficiently used, thereby reducing the system throughput. Increased.

2 shows a flow of a method according to an embodiment of the present invention. The structure of the user equipment of the Example of this invention is shown. The structure of the base station of the Example of this invention is shown.

  The method of the embodiment of the present invention includes the following steps as shown in FIG.

  In step 11, the user equipment selects the first cell in the resource block based on the cell dynamic selection technique.

  In step 12, when the user equipment is a cell edge user equipment of the first cell, the user equipment calculates a first throughput and a second throughput in the resource block based on a measurement result.

  The first throughput and the second throughput are throughputs that the user equipment can realize by using the resource block in the mute mode and the normal mode, respectively.

  In the mute mode, when the cell with the strongest instantaneous received power allocates a resource block to the user equipment and the user equipment is a cell edge user equipment of a service cell, the cell with the second highest instantaneous received power has the resource A block is not allocated to a user, and the transmission power in the resource block of the base station to which the first cell belongs becomes twice the normal transmission power.

  In step 13, the user equipment determines whether the first throughput is greater than twice the second throughput and obtains a determination result.

  In step 14, when the determination result indicates that the first throughput is more than twice the second throughput, the user equipment is assigned to the first cell so as to use the mute mode in the resource block. Base station to which the first cell belongs so that the mute mode is not used in the resource block when the determination result does not indicate that the first throughput is more than twice the second throughput. Instruct the station.

上記の式において、Ｐ：単位送信電力、ｇ（ｓ）：上記第１セルが所属する基地局ｓからユーザ設備までのチャネル減衰、Ｎ：システムのセル総数、Ｎ₀：ノイズ、ｇ（ｎ）：上記第１セルの信号が最も強い隣接セルが所属する基地局ｎからユーザ設備までのチャネル減衰。 In a specific embodiment of the present invention, the first throughput is C (s) and the second throughput is C (s, n) as described below.
(formula)

In the above equation, P: unit transmission power, g (s): channel attenuation from the base station s to which the first cell belongs to user equipment, N: total number of cells in the system, N ₀ : noise, g (n) : Channel attenuation from the base station n to which the adjacent cell with the strongest signal of the first cell belongs to the user equipment.

  As can be seen from the above description, when the mute mode is not used, if the throughput that the edge user A of the first cell can obtain in the resource block is A1, the resource block is also allocated to other users in the second cell. Therefore, when the mute mode is not used in the first cell and the second cell, the throughput achievable with the resource block is 2A1.

  In the mute mode, if the throughput that the edge user A of the first cell can acquire in the resource block is B1, the resource block is muted in the second cell, and thus the throughput cannot be realized. Therefore, the first cell and the second cell In the mute mode, the sum of the throughputs that can be realized by the resource block is B1.

  Overall, when using the mute mode, there is a performance improvement for the cell edge user equipment, but considering the overall performance of the system, in the embodiment of the present invention, only when B1> 2A1, Transmit using mute mode. Therefore, the system throughput can be improved as compared with the case where the direct mute mode is used.

  Of course, for scheduling on the base station side, in the embodiment of the present invention, the user equipment feeds back channel information of the downlink channel with the base station to which the first cell belongs to the serving base station. Step 15 is further included.

  In a specific embodiment of the present invention, step 11 specifically includes the following steps.

  In step 111, for the resource block, the user equipment calculates the downlink SNR in the resource block of each base station in the active set based on the downlink measurement value.

  In step 112, the user equipment selects a base station having the maximum SNR as a base station that transmits a downlink signal using the resource block. The first cell belongs to a base station having the maximum SNR.

  In step 113, the user equipment notifies the serving base station of the selected base station.

  In a specific embodiment of the present invention, when the power difference between the first downlink reference signal and the second downlink reference signal received by the user equipment is smaller than a preset threshold, the user equipment User equipment. The first downlink reference signal is a downlink reference signal transmitted from a serving base station, and the second downlink reference signal is a base station having the strongest signal received by the user among neighboring base stations of the serving base station. Is a downlink reference signal transmitted from.

  The inter-cell resource scheduling method according to the embodiment of the present invention further includes the following steps.

  In step 15, the base station performs joint scheduling of resources based on feedback from user equipment.

  As a resource block and power allocation method, a proportional fair algorithm and other resource scheduling algorithms can be cited. For example, in the case of the proportional fair algorithm, priority values in all resource blocks of all users in all cells are assigned in descending order.

  Since joint scheduling of resources belongs to the category of the prior art, detailed description will not be given here.

In step 16, the base station calculates the power average value as follows.
A / [B + C-D]
In the above equation, A: total transmission power of base station, B: total number of resource blocks of base station, C: number of resource blocks allocated to user equipment in mute mode, D: number of resource blocks muted.

  In step 17, the base station transmits a downlink signal with the first power for the normal user equipment, and transmits a downlink signal with the second power for the user equipment in the mute mode. The first power is the average power value, and the second power is twice the average power value.

  When the above method is used, all the resource blocks and all the transmission powers are fully used, thereby improving the system throughput. It is exemplified as follows.

  Assuming the total transmission power of the base station, it is assumed that four resource blocks need to be transmitted with double power out of a total of ten resource blocks, and two resource blocks are muted. Then, there are eight resource blocks that can be actually used by the base station. When using the prior art, the base station can use only 6 resource blocks. The reason is that four resource blocks that need to be transmitted with twice the power use 80% transmission power, and the remaining 20% transmission power can only be allocated to two resource blocks. There are two other resource blocks that cannot be done. This always reduces the system throughput.

  On the other hand, when using the method of the embodiment of the present invention, first, the power is divided into (B + C−D) = 12 parts, and 12 parts of each of the four resource blocks that need to be transmitted with double power are used. Two portions of the power are allocated, and the remaining four portions can be equally divided into the remaining four resource blocks. Accordingly, since all resource blocks are available, the system throughput can be increased.

  Assuming the total transmission power of the base station, the base station has a total of 10 resource blocks and divides the power into 10 parts. Assuming that two resource blocks need to be transmitted with twice the power and the four resource blocks are muted, there are six resource blocks that the base station can actually use. When using the prior art, two resource blocks that need to be transmitted with double power use 40% transmission power, and four resource blocks that transmit with single transmission power transmit 40% Since power is used, the remaining 20% of transmission power is not used. This always reduces the system throughput.

  On the other hand, when using the method of the embodiment of the present invention, first, the power is divided into (B + C−D) = 8 parts, and two parts of each of the two resource blocks that need to be transmitted with twice the power are provided. Power is allocated, and the remaining four portions of power can be allocated to the remaining four resource blocks. Therefore, all transmission power is used, and the throughput of the system can be increased.

  As shown in FIG. 2, a user equipment according to an embodiment of the present invention includes a cell selection module that selects a first cell in a resource block based on a cell dynamic selection technique, and the user equipment is a cell of the first cell. In the case of an edge user equipment, in the resource block, a throughput calculation module that calculates a first throughput and a second throughput that the user equipment can realize by using the resource block in the mute mode and the normal mode, and the first A determination module that determines whether the throughput is greater than twice the second throughput and obtains a determination result; and if the determination result indicates that the first throughput is more than twice the second throughput, the resource Instruct the base station to which the first cell belongs to use the mute mode in the block. A feedback module for instructing the base station to which the first cell belongs to not to use the mute mode in the resource block if the determination result does not indicate that the first throughput is more than twice the second throughput; ,including.

  As shown in FIG. 3, the base station according to the embodiment of the present invention includes a resource joint scheduling module that performs joint scheduling of resources based on feedback from user equipment, and a power average value A / [B + C−D] (A: A power average value calculation module for calculating the total transmission power of the base station, B: the total number of resource blocks of the base station, C: the number of resource blocks allocated to the user equipment in the mute mode, and D: the number of muted resource blocks) For the user equipment not in the mute mode, the downlink signal is transmitted with the first power that is the average power value, and for the user equipment in the mute mode, the downlink signal is transmitted with the second power that is twice the average power value. A transmission module.

  A mobile communication system according to an embodiment of the present invention includes user equipment and a base station.

  When the user equipment is a cell selection module that selects a first cell in a resource block based on a cell dynamic selection technique, and the user equipment is a cell edge user equipment of the first cell, in the resource block, A throughput calculation module for calculating a first throughput and a second throughput that can be realized by using the resource block in the mute mode and the normal mode; and whether the first throughput is greater than twice the second throughput. A determination module for determining whether or not the first throughput is greater than or equal to twice the second throughput, so that the mute mode is used in the resource block. The base station to which one cell belongs is instructed, and the first cell If Putto is not indicated as being more than twice the second throughput, not to use the mute mode in the resource block, including a feedback module to instruct the base station to the first cell belongs.

  The base station includes a resource joint scheduling module that performs joint scheduling of resources based on feedback from the user equipment, a power average value A / [B + C−D] (A: total transmission power of the base station, B: base station Power average value calculating module for calculating the total number of resource blocks, C: number of resource blocks allocated to user equipment in mute mode, D: number of resource blocks muted), and user power not in mute mode. A transmission module that transmits a downlink signal with a first power that is an average value, and transmits a downlink signal with a second power that is twice the average power value for user equipment in a mute mode.

  The above embodiment has been described by taking as an example that the number of base stations that provide wireless communication services to the user equipment in the mute mode is two. When the number of base stations providing wireless communication services to the user equipment in the mute mode is N, it is necessary to determine whether the first throughput is greater than N times the second throughput. When a determination result is obtained and the determination result indicates that the first throughput is greater than or equal to N times the second throughput, the base station to which the first cell belongs so as to use the mute mode in the resource block If the determination result does not indicate that the first throughput is greater than or equal to N times the second throughput, the base station to which the first cell belongs is instructed not to use the mute mode in the resource block. .

  When the base station allocates energy, the average power value is A / [B + (N−1) C−D]. A is the total transmission power of the base station, B is the total number of resource blocks of the base station, C is the number of resource blocks allocated to the user equipment in the mute mode, and D is the number of muted resource blocks. The transmission power of the user equipment in the mute mode is N times the power average value.

  It is exemplified as follows. When cell A has three adjacent cells, cell B, cell C, and cell D, and the user equipment is in cell A, the user equipment is the edge user equipment of cell A when viewed from cell B and cell C. However, from the viewpoint of cell D, the user equipment is not the edge user equipment of cell A. In this case, N is 3, that is, in the mute mode, the cell / base stations that provide the wireless communication service to the user equipment are A, B, and C, and the number thereof is three.

  Assuming that the user equipment is assigned to the resource block A1 in the cell A, the resource blocks A1 of the cell B and the cell C are both muted, and transmission is performed with three times the transmission power in the resource block A1 of the cell A.

In order to verify the effects of the embodiments of the present invention, simulation evaluation results are shown here. The simulation parameters are as follows.
Carrier frequency 2000MHz
Cell arrangement Hexagonal lattice, 19 cells, 3 sectors / cell Antenna type (gain) 70 degree fan beam antenna (14 dBi), front / back ratio 20 dB
ISD 500m
System bandwidth 10MHz
Subframe length 1 ms Resource block bandwidth 180KHZ (12 subcarriers)
Distance correlation path loss 128.1 + 37.6 log ₁₀ (r)
Intrusion loss 20 dB
Channel model TU6rays
Scheduling algorithm Fairness algorithm Moving speed (maximum Doppler frequency) 3km / h (5.55Hz)

The simulation results of the embodiment of the present invention are as shown in the following table.

  As can be seen from the table above, when using the method of the embodiment of the present invention, a certain degree of improvement in throughput is seen compared to the conventional method regardless of whether or not a new allocation of power is performed. If a new allocation of power is performed, the throughput of the system can be further increased.

  The above is only a preferred implementation mode of the present invention. For general engineers in the field, some modifications and modifications are possible on the premise that the principle of the present invention is not deviated. However, it will be understood that these modifications and modifications are also within the protection scope of the present invention.

Claims (7)

In an inter-cell resource scheduling method used in a mobile communication system based on CoMP transmission / reception,
The user equipment selects a first cell in the resource block based on a cell dynamic selection technique, 11.
When the user equipment is a cell edge user equipment of the first cell, in the resource block, the first throughput and the second throughput that the user equipment can realize by using the resource block in the mute mode and the normal mode. Calculating step 12;
The user equipment determines whether the first throughput is greater than N times the second throughput and obtains a determination result;
However, N is the number of base stations that provide wireless communication services to the user equipment in the mute mode,
If the determination result indicates that the first throughput is greater than or equal to N times the second throughput, the user equipment transmits to the base station to which the first cell belongs to use the mute mode in the resource block. Instructing the base station to which the first cell belongs not to use the mute mode in the resource block if the determination result does not indicate that the first throughput is greater than N times the second throughput. Step 14;
An inter-cell resource scheduling method comprising:   The cell according to claim 1, wherein the user equipment further includes a step 15 of feeding back channel information of a downlink channel with the base station to which the first cell belongs to a serving base station. Inter-resource scheduling method. In step 11 above,
For the resource block, the user equipment calculates a downlink SNR in the resource block of each base station in the active set 111,
The user equipment selects a base station having a maximum SNR including the first cell as a base station that transmits a downlink signal using the resource block;
The user equipment notifying the selected base station to the serving base station 113;
The inter-cell resource scheduling method according to claim 2, further comprising: The base station performs joint scheduling of resources based on feedback from the user equipment, 16;
The base station calculates a power average value A / [B + (N−1) C−D], 17;
Where A: total transmission power of base station, B: total number of resource blocks of base station, C: number of resource blocks allocated to user equipment in mute mode, D: number of resource blocks muted,
The base station transmits a downlink signal with the first power that is the average power value for user equipment that is not in the mute mode, and a downlink signal with a second power that is N times the average power value for the user equipment that is in the mute mode. Sending step 18;
The inter-cell resource scheduling method according to any one of claims 1 to 3, further comprising: In user equipment used in a mobile communication system based on CoMP transmission / reception,
A cell selection module for selecting a first cell in a resource block based on a cell dynamic selection technique;
When the user equipment is a cell edge user equipment of the first cell, the first and second throughputs in the resource block that can be realized by using the resource block in the mute mode and the normal mode by the user equipment. A throughput calculation module to calculate,
A determination module that determines whether the first throughput is greater than N times the second throughput and obtains a determination result;
However, N is the number of base stations that provide wireless communication services to the user equipment in the mute mode,
If the determination result indicates that the first throughput is greater than or equal to N times the second throughput, the base station to which the first cell belongs is instructed to use the mute mode in the resource block, and the determination If the result does not indicate that the first throughput is greater than N times the second throughput, a feedback module that instructs the base station to which the first cell belongs to not use the mute mode in the resource block;
The user equipment characterized by including. In a base station used in a mobile communication system based on CoMP transmission / reception,
A resource joint scheduling module for joint scheduling of resources based on feedback from user equipment;
A power average value calculation module for calculating a power average value A / [B + (N-1) CD];
However, A: Total transmission power of base station, B: Total number of resource blocks of base station, C: Number of resource blocks allocated to user equipment in mute mode, D: Number of resource blocks muted, N: In mute mode , The number of base stations that provide wireless communication services to the user equipment,
Transmission that transmits a downlink signal with the first power that is the average power value for user equipment that is not in the mute mode, and transmits a downlink signal with a second power that is N times the average power value for the user equipment that is in the mute mode. Module,
A base station comprising: In a mobile communication system based on CoMP transmission / reception, including user equipment and a base station,
The above user equipment
A cell selection module for selecting a first cell in a resource block based on a cell dynamic selection technique;
When the user equipment is a cell edge user equipment of the first cell, the first and second throughputs in the resource block that can be realized by using the resource block in the mute mode and the normal mode by the user equipment. A throughput calculation module to calculate,
A determination module that determines whether the first throughput is greater than N times the second throughput and obtains a determination result;
However, N is the number of base stations that provide wireless communication services to the user equipment in the mute mode,
If the determination result indicates that the first throughput is greater than or equal to N times the second throughput, the base station to which the first cell belongs is instructed to use the mute mode in the resource block, and the determination If the result does not indicate that the first throughput is greater than N times the second throughput, a feedback module that instructs the base station to which the first cell belongs to not use the mute mode in the resource block;
Including
The base station
A resource joint scheduling module that performs joint scheduling of resources based on feedback from the user equipment;
A power average value calculation module for calculating a power average value A / [B + (N-1) CD];
Where A: total transmission power of base station, B: total number of resource blocks of base station, C: number of resource blocks allocated to user equipment in mute mode, D: number of resource blocks muted,
Transmission that transmits a downlink signal with the first power that is the average power value for user equipment that is not in the mute mode, and transmits a downlink signal with a second power that is N times the average power value for the user equipment that is in the mute mode. Module,
A mobile communication system comprising:

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