Dynamic soft frequency reusing method based on cognition

Abstract

The invention discloses a dynamic soft frequency reusing method based on cognition. According to the dynamic soft frequency reusing method based on the cognition, frequency spectrum using state information is obtained by means of mutual cooperation of cognition base stations, so that an available resource set is determined and same frequency interference from a neighboring cell is evaluated, and then dynamic resource borrowing and flexible selection of service base stations are carried out on the edge of an over-loaded cell according to the communication quality of a resource block. According to the dynamic soft frequency reusing method based on the cognition, a relatively fixed resource distributing method used on edge users according to traditional soft frequency reuse is changed, and the resource utilization rate is improved and transmission rate of the edge users is increased remarkably on the premise that inter-cell interference is effectively suppressed.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a cognition-based dynamic soft frequency multiplexing method for LTE (Long Term Evolution, long-term evolution) downlink, which can effectively suppress inter-cell interference, ensure the communication quality of edge users, and improve system resources utilization rate. Background technique [0002] With the increasing demand for data transmission rate in mobile communication services, higher and higher requirements are placed on the frequency efficiency of mobile communication systems. For cellular systems, it is hoped that the frequency reuse factor between cells will be as close to 1 as possible. However, while reducing the frequency reuse factor, it will inevitably introduce interference problems, especially co-frequency interference between adjacent cells, which will lead to a sharp decline in the service quality of cell edge users. For the second-generation mobile...

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Problems solved by technology

[0003] The disadvantage of traditional SFR is that the spectrum allocation method of cell edge users is relatively fixed, and only a part of the system spectrum can be used. When the business load is unevenly distributed, the system frequency efficiency is low

In order to alleviate this problem, some improvement schemes have been proposed: in the literature ZhangX, HeC, Jiang L, et al.Inter-cell Interference Coordination Based on Softer Frequency Reuse in OFDMA Cellular Systems [C] / / Proceedings of IEEE Intern Conf NNSP.Nanjing : IEEE press, 2008: 270-275 (Inter-cell Interference Coordination of OFDMA Cellular System Based on Soft Frequency Multiplexing), using an improved proportional fair scheduling algorithm (Proportional Fair, PF), edge users can use all resource blocks (Resource Block ,RB), the spectrum utilization is improved, but at the same time the inter-cell interference is increased

3GPP, R1-051341, Flexible Fractional Frequency Reuse Approach[S].Seoul:Samsung, 2005 (a flexible partial frequency reuse method) proposed a method to flexibly occupy the edge spectrum of adjacent cells to solve the problem of excessive load at the cell edge However, since the orthogonality of edge area resources between adjacent cells is not guaranteed in the process, co-channel interference is caused to adjacent cells, and this method selects RBs in a fixed order, which cannot adapt to dynamic channel changes

The current research work is mainly in heterogeneous network scenarios, and the research on cognitive technology to improve the performance of edge users in LTE homogeneous networks is still quite scarce

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