Method for coordinating interference in relay network district

Abstract

The invention relates to a method for interference coordination among cells of a wireless communication network with a relay station, comprising interference coordination of the overlay area of a base station and interference coordination of the overlay area of the relay station. The method comprises the following steps: firstly, limited interference sources are selected; then layering is carriedout to the cells, to which the limited interference sources belong; the distribution mode of resource reservation, priority number of service quality and channel loss compensation factors are set; and finally, according to the loading situation of the area of the user terminal, whether power adjustment process is carried out after the priority number of the service quality is started is determined. The selection of the limited interference sources, the area division and the distribution mode of the time frequency resources are beneficial to the flexible scheduling when the loading of the timefrequency resources of the division area of the limited interference sources is overlarge or full, and beneficial to separation of the time frequency resources of different limited interference sources, thus ensuring the orthogonality of the time frequency resources, reducing the interference among the cells and guaranteeing the service quality under the condition of meeting the minimum service quality.

Description

technical field [0001] The present invention relates to a wireless communication network, in particular to a method for coordinating interference within a cell in a relay network. Background technique [0002] In the next-generation broadband wireless communication network, solving inter-cell interference in the wireless communication network becomes a key factor for improving inter-cell user terminal (User Terminal, UT) throughput and UT average throughput. [0003] At present, in IEEE 802.16j, IMT-Advanced, and WINNER (Wireless World Initiative New Radio), methods such as interference randomization, interference coordination, and interference cancellation are proposed to solve inter-cell interference problems. The Long Term Evolution (LTE) of the Third Generation Partnership Project proposes to divide the cell coverage area into an inner layer and an outer layer according to the strongest interference level from the UT to all adjacent cells, and adopt partial power control...

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Problems solved by technology

[0004] Using layered partial power control and path loss compensation methods, when the load in the wireless communication network is light or span load, the time-frequency resources used by each adjacent cell, that is, the Physical Resource Block (Physical Resource Block) can be guaranteed. , PRB) remain orthogonal, but when the load is relatively heavy, it is difficult to ensure that the time-frequency resources used between all adjacent cells remain orthogonal through scheduling, although it is possible to distinguish the time-frequency resources used in adjacent cells by setting sensitive areas The part with the highest collision probability in time-frequency resources is completely orthogonal, but it reduces the flexibility of scheduling and reduces the spectrum utilization rate during partial power control and path loss compensation, resulting in the throughput of user terminals at the cell edge and the average throughput of user terminals. decline in volume

[0005] For the relay network, all relay stations in the network are equivalent to independent virtual base stations. Therefore, in the relay network, the interference between the base stations in the relay network and all relay stations must be considered. At this time, if the The partial power control and path loss compensation method of the above layered structure still has the problem that when the load is relatively heavy, it is difficult to ensure that the time-frequency resources used between all adjacent cells remain orthogonal through scheduling. At the same time, It will also bring about the problem of reduced scheduling flexibility and reduced spectrum utilization during path loss compensation, which directly leads to a decrease in the throughput of user terminals at the cell edge and the average throughput of user terminals.

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