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Method for coordinating interference among cells, base station equipment and communication system

A technology of inter-cell interference and base station equipment, applied in the field of communication, can solve problems such as serious ICI problems, and achieve the effect of improving performance gain and reducing delay

Inactive Publication Date: 2014-04-09
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology has become the core technology of the broadband mobile communication 3GPP LTE standard, and it solves intra-cell interference better than CDMA (Code Division Multiple Access, Code Division Multiple Access) technology The problem, but as a price, the ICI problem brought by the OFDM system is more serious than that of the CDMA system

Method used

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  • Method for coordinating interference among cells, base station equipment and communication system
  • Method for coordinating interference among cells, base station equipment and communication system
  • Method for coordinating interference among cells, base station equipment and communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 下面以一个小区有6个邻小区为例,对本发明提供的小区间干扰协调的方法的实施作进一步的详细描述。 Such as image 3 所示,其中1小区为服务小区,2、3、4、5、6、7为1的邻小区,UE从服务小区1的边缘移动到服务小区1中心,小区拓扑图及UE运动轨迹见 image 3 .

[0046] 本实施例1的小区间干扰协调的方法包括:

[0047] 在eNodeB侧先划分频带资源;当UE是CCU时,则该UE在调度时只能使用小区中心用户所能使用的频带资源;如果是CEU,则调度时只能使用小区边缘用户所能使用的频带资源。 for image 3 所示的小区,所有的频带资源平均分为4份(f1、f2、f3、f4),所有小区的中心使用同样的频带资源,即f1频带部分。而1小区的边缘用户只能使用频带f4部分,2、4、6小区的边缘用户只能使用频带资源f3,3、5、7小区边缘的用户只能使用频带资源f2。

[0048] 判断UE是CCU用户还是CEU用户,根据UE的类型为用户分配频带资源,下面详细说明根据UE运动轨迹为UE分配频带资源的过程:

[0049] 1)eNodeB首先把处于激活态的UE初始化为CCU,将1的最新邻小区列表LastCellTriggeredList置为NULL,向UE下发ICIC目的的A3事件触发的测量控制,将reportOnLeave设为真,当reportOnLeave设为真时,UE才会对满足A3-2事件的测量上报给eNodeB;

[0050] 在出发点,由于UE处在1、3、4小区的交界处,UE会上报ICIC目的的A3事件的测量报告,eNodeB从上报的测量报告中抽取当前邻小区列表CurrCellTriggeredList={3,4}。

[0051] 判断当前邻小区列表是否是最新邻小区列表的真子集( CurrCellTriggeredList ⋐ LastCellTriggeredList ),可以看出CurrCellTriggeredList并不是LastCellTriggeredList的真子集,这时邻小区数与初始化的邻小区数相比增加了两个,因此上报的A3事件为A3-1事件,然后使LastCellTri...

Embodiment 2

[0069] 下面以一个小区只有1个邻小区为例,对本发明提供的小区间干扰协调的方法的实施作进一步的详细描述。 Such as Figure 4 所示,其中1小区为服务小区,2为1的邻小区,UE从服务小区1的中心移动到服务小区边缘,小区拓扑图及UE运动轨迹见 Figure 4 .

[0070] 本实施例2的小区间干扰协调的方法包括:

[0071] 在eNodeB侧先划分频带资源。 for Figure 4 所示的小区,所有的频带资源平均分为3份(f1、f2、f3),1、2小区的中心使用同样的频带资源,即频带f1部分。而1小区的边缘用户只能使用频带f3,2小区的边缘用户只能使用频带资源f2。

[0072] 判断UE是CCU用户还是CEU用户,根据UE的类型为用户分配频带资源,下面详细说明根据UE运动轨迹为UE分配频带资源的过程:

[0073] 1)eNodeB首先把处于激活态的UE初始化为CCU,将1的最新邻小区列表LastCellTriggeredList置为NULL,向UE下发ICIC目的的A3事件触发的测量控制,将reportOnLeave设为真;

[0074] 在出发点,由于UE处在1小区的中心,UE检测不到邻小区,没有A3事件上报,UE的状态类型不变;

[0075] 调度时该用户只能使用小区1中心用户所能使用的频带资源,即频带f1。此时,如果小区1中频带f1已经分配完,而此时小区中心的吞吐量不能满足规划吞吐量的情况下,可以分配给该用户频带f2;或者可以将分配给本小区边缘用户但还未被CEU用户使用的频带资源f4分配给用户。

[0076] 2)当UE运动到1与2的交界处,UE会上报ICIC目的的A3事件,且上报的当前邻小区列表CurrCellTriggeredList={2};

[0077] 判断当前邻小区列表是否是最新邻小区列表的真子集,可以看出CurrCellTriggeredList不是LastCellTriggeredList的真子集,邻小区数增加了一个,因此上报的A3事件为A3-1事件,然后使LastCellTriggeredList=CurrCellTriggeredList={2},把该UE归为CEU;

[0078] 为用户分配频带f3,调度时该用户只能使用频带f3; ...

Embodiment 3

[0084] The implementation of the inter-cell interference coordination method provided by the present invention will be further described in detail below by taking the case where a serving cell has no neighboring cells as an example. For details on the cell topology and UE trajectory, see Figure 5 .

[0085] The frequency band resources are first allocated on the eNodeB side. for Figure 5 In the shown cell, all the frequency band resources are equally divided into two parts (f1, f2), the center of the cell uses the part of the frequency band f1, and the edge users of the cell can only use the part of the frequency band of the area f2.

[0086] The CCU can use the unused frequency band resources at the edge of the cell; and since the cell has no neighbor cells, the UE in the cell cannot cause interference to other neighbor cells, and the UE can also use the resources allocated to the user CEU at the edge of the cell, that is, Use the entire system bandwidth resources.

[0...

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Abstract

The invention provides a method for coordinating interference among cells, base station equipment and a communication system. The communication system comprises a plurality of pieces of base station equipment; the base station equipment is used for determining a user type according to neighbor cell list information reported in real time by a user and distribute corresponding frequency band resources to the user according to the user type and the stored resource information for dividing different frequency band resources for different user types. The invention distributes the frequency band resources in the cells on the basis of correctly distinguishing the user into a cell edge user and a central user so as to reduce the interference of the cell edge user on a neighbor cell as far as possible, thereby optimizing the performance of the edges of the cells.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for coordinating interference between cells in an LTE system, base station equipment and a communication system. Background technique [0002] ICI (Inter-Cell Interference, inter-cell interference) is an inherent problem in cellular mobile communication systems, and the traditional solution is to use frequency reuse. The future broadband mobile communication system LTE (Long Term Evolution, Long Term Evolution) has high requirements on spectrum efficiency, so it is hoped that the spectrum reuse factor will be as close as possible to 1. OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology has become the core technology of the broadband mobile communication 3GPP LTE standard, and it solves intra-cell interference better than CDMA (Code Division Multiple Access, Code Division Multiple Access) technology However, as a price, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/08H04W72/12H04W72/54
Inventor 刘献玲徐云翔
Owner ZTE CORP
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