Dynamic soft-frequency reuse algorithm for cell interference coordination
A technology of soft frequency reuse and algorithm adjustment, applied in the direction of multi-frequency code system, etc., can solve problems such as difficult to adapt to load variability, low spectrum utilization, resource flexibility and lack of adaptability, etc.
Inactive Publication Date: 2014-07-23
SUN YAT SEN UNIV +1
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Static frequency planning leads to low spectrum utilization, and insufficient flexibility and adaptability of resource allocation, making it difficult to adapt to the variability of load in the wireless environment
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[0025] The implementation of dynamic soft frequency reuse is mainly divided into two parts: one is to dynamically adjust the number of main carriers, and the other is to dynamically configure main carriers.
[0026] The algorithm of dynamically adjusting the number of main carriers means that each sector counts the load of the sector with a period of 1000 transmission time intervals, and notifies the adjacent sectors; after obtaining the load of the adjacent sectors, the This formula calculates the number of primary carriers in a sector, where S is the sum of the number of system carriers, ρ i is the load value of sector i, S i It is the number of primary carriers in this sector.
[0027] The dynamic main carrier configuration algorithm first obtains the number S of main carriers that can be allocated by the sector in the scheduling period i , the number is obtained by dynamically adjusting the number of main carriers; then, through the CQI value fed back by the edge user, ...
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The invention aims at providing a dynamic soft-frequency reuse algorithm for cell interference coordination. The algorithm is capable of adapting to inter-cell load change and includes two parts: dynamic adjustment of a carrier (called main carrier) number of edge users and dynamic main carrier configuration. In a first part, that is, a dynamic main carrier number adjustment algorithm, each sector calculates the load value through using 1000 transmission time intervals as a period and notifies the value to an adjacent sector and each sector adjusts the main carrier number N according to a proportion of a load of the sector in a total load. In a second part, that is a dynamic main carrier configuration algorithm, according to a proportional fairness scheduling algorithm, a proportional fairness factor of each user in all of the carriers is determined and then first N subcarriers which are highest in factor are selected and distributed to the edge users to which the subcarriers belong. If a plurality of user factors are identical, the subcarriers are randomly distributed to one of the edge users to which the subcarriers belong. The algorithm improves system throughput by about 12%, edge user throughput by 4.5% and center user throughput by 13% compared with traditional soft frequency reuse.
Description
Technical field: [0001] The invention relates to a soft frequency multiplexing method for interference coordination in LTE cells. Background technique [0002] The downlink of the LTE system adopts OFDM technology. Due to the good orthogonality between OFDM subcarriers, the interference between users in the cell can be effectively suppressed. In order to support a higher transmission rate and system capacity, objectively higher requirements are put forward for the efficiency of frequency reuse among multiple cells, and full frequency reuse (that is, the frequency reuse coefficient is 1) is a powerful solution to meet the above requirements. Program. However, under the network coverage strategy using the same-frequency networking, the same-frequency interference of different cells will become very serious. Therefore, how to avoid or reduce inter-cell interference becomes an important issue for improving LTE system capacity and user service quality. [0003] In order to avo...
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IPC IPC(8): H04L27/26
Inventor 余浩农朱志成张琳张赟
Owner SUN YAT SEN UNIV