Inter-cell interference coordination method and system

A technology of inter-cell interference and coordination methods, applied in the field of communication, can solve problems such as inability to adapt to changes in network load, and achieve the effect of optimizing performance

Active Publication Date: 2015-09-16
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is proposed in view of the problem in the related art that inter-cell interference coordination based on a fixed bitmap cannot adapt to changes in network load. Therefore, the main purpose of the present invention is to provide a method and system for inter-cell interference coordination to solve the above-mentioned problems. question

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  • Inter-cell interference coordination method and system

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Embodiment 1

[0074] image 3 It is a schematic diagram of dividing frequency band resources and setting RNTP bitmap according to the preferred embodiment 1 of the present invention, such as image 3 As shown, it includes three cells that are adjacent to each other. The implementation of the technical solution will be further described in detail below with cell 1 as the main line.

[0075] It is assumed that TrdNum of the three cells is 3, and the initial RNTP Threshold is 1 dB.

[0076] (1) Divide frequency band resources.

[0077] The entire system bandwidth is divided into 4 parts, which are divided into PRB units, which can be continuous or discontinuous. The frequency band corresponding to frequency band A is the part that can be used by the centers of the three cells, and B is used by the edge of cell 1. C is used by the edge of cell 2, and D is used by the edge of cell 3;

[0078] (2) Set the RNTP bitmap.

[0079] The center of cell 1 can borrow the frequency bands C and D on the...

Embodiment 2

[0091] Figure 5 It is a schematic diagram of dividing frequency band resources and setting RNTP bitmap according to preferred embodiment 2 and preferred embodiment 3 of the present invention, such as Figure 5 As shown, it includes four cells with multi-layer neighbors, where the neighbors of cell 1 are cell 2 and cell 3 respectively, the neighbors of cell 2 are only cell 1, and the neighbors of cell 3 are cell 1 and cell 4 respectively, The only neighbor cell of cell 4 is cell 3.

[0092] It is assumed that TrdNum of all cells is 3, the initial RNTP Threshold of cells 1, 2, and 3 are all 1 dB, and the initial RNTP Threshold of cell 4 is 0 dB.

[0093] (1) Divide frequency band resources.

[0094] For attached Figure 5 In the shown cell, all frequency band resources are equally divided into 3 parts, where A is the dedicated frequency band for all center users of the cell, and for cell 1, the frequency band available to edge users is B; the available frequency band resourc...

Embodiment 3

[0106] by Figure 5 The cell shown is an example.

[0107] It is assumed that the initial RNTP Threshold of all cells 1, 2, 3, and 4 is 1dB. For details of the signaling process, see the attached Figure 7 .

[0108] (1) Divide frequency band resources.

[0109] For attached Figure 4 In the shown cell, all frequency band resources are equally divided into 3 parts, where A is the dedicated frequency band for all center users of the cell, and for cell 1, the frequency band available to edge users is B; the available frequency band resources for the edge of cells 2 and 3 are Region C; the frequency band resource available at the edge of cell 4 is region B.

[0110] (2) Set the RNTP bitmap.

[0111] The center of cell 1 can borrow the frequency band C at the edge of 2 and 3, so the part corresponding to B in the RNTP bitmap of cell 1 is set to "1", and the other frequency bands are set to "0"; similarly, the RNTP bitmaps of cells 2 and 3 correspond to The part of C is set ...

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Abstract

Disclosed are an inter-cell interference coordination method and system. The method includes: counting by a first cell the number of user devices whose QoS is substandard, or the number of user devices whose radio link has failed therein; and adjusting the RNTP threshold(s) of the first cell and / or a second cell adjacent thereto according to the number and a preset number threshold. The present invention can realize inter-cell interference coordination according to the variation in the network load, thus optimizing the performance of the cell edge.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and system for inter-cell interference coordination. Background technique [0002] Inter-Cell Interference (ICI for short) is an inherent problem in cellular mobile communication systems, and a traditional solution is to use frequency reuse. The long-term evolution (Long-Term Evolution, LTE for short) of the future broadband mobile communication system has high requirements on spectrum efficiency, so it is hoped that the spectrum reuse factor is as close as possible to 1. Orthogonal Frequency Division Multiplexing (OFDM) technology solves the problem of intra-cell interference better than Code Division Multiple Access (CDMA) technology, but as a cost, the OFDM system has The coming ICI problem is more serious than the CDMA system. If two adjacent cells use the same spectrum resource at their junction, a stronger ICI will result. [0003] The interference between down...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W16/14H04W24/02H04W52/04
CPCH04W16/10
Inventor 刘献玲
Owner ZTE CORP
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