Joint user scheduling method and power distribution method based on large-scale MIMO

Abstract

The invention discloses a joint user scheduling method based on large-scale MIMO and a corresponding power distribution method. The joint user scheduling method comprises the following steps: 1, obtaining a channel matrix, a power allocation vector, a scheduling vector and a precoding matrix; 2, calculating signal to interference plus noise ratios and average data rate areas of a macro user, a small base station and a small user; 3, calculating an optimal scheduling vector on the basis of maximizing a network utility function under the conditions of non-ideal channel state information and limited wireless backhaul queues; and 4, updating a queue according to the optimal scheduling vector. According to the method, the performance of the whole network can be optimized when the system dynamically changes, and the overall throughput of the large-scale MIMO system is remarkably improved.

Description

technical field [0001] The invention relates to a massive MIMO-based joint user scheduling method and a corresponding power allocation method, belonging to the technical field of wireless communication. Background technique [0002] For the deployment of 5G ultra-dense networks, the existing wired backhaul solution based on optical fiber links needs to connect optical fibers to each small base station, and the deployment cost is very expensive, which is obviously not feasible. Therefore, low-cost and convenient wireless backhaul is a more suitable solution. In addition, in the current frequency band below 6GHz, there are very few spectrum resources available for cellular mobile networks, which may not even meet the spectrum requirements for wireless access of the 5G system. Moreover, due to the large wavelength of this frequency band, it is not suitable for use in small base stations. Deploy large-scale antenna arrays at the end. Therefore, it is not feasible to directly u...

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Problems solved by technology

[0003] In the paper "Millimeter-wave Gbps Broadband Evolution towards 5G: Fixed Access and Backhaul" published by Pi Z, Choi J, Jr R H (IEEE Communications Magazine, 2015, 54(4):6–11), the millimeter wave broadband system is proposed as The important backhaul problem in current and future cellular systems provides a solution, the key idea is to use the spectrum already available in the millimeter wave band, through optimized dynamic beamforming and massive MIMO infrastructure, to achieve fixed wireless access, thus in large High capacity within range coverage, but its disadvantage is that only the wireless backhaul network utilizes the mmWave frequency band, while the access network operates in another frequency band

These three schemes respectively consider the situation of poor channel conditions between the base station and the user, the situation of the self-interference cancellation of the base station, and the situation of adding an interference suppression process at the base station, but it does not explain how to dynamically consider the backhaul dynamics and scheduling. Optimize the performance of the entire network without considering the average throughput of users at the edge of each cell

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