A self-optimization method for interference management based on non-orthogonal multiple access

Abstract

The invention discloses a self-optimization method for interference management based on non-orthogonal multiple access, which belongs to the field of wireless networks. Specifically, firstly, in an ultra-dense scene, each small base station calculates and requests each small base station separately for a fixed sub-bandwidth. The signal-to-noise ratio between users, according to the perceived interference signal strength of adjacent base stations, deletes the adjacent interfering base stations of the base station, and independently constructs a dynamic local interference map; then, considering the user's communication needs and local interference map information comprehensively, Each small base station completes resource allocation independently. In order to reduce inter-network interference, the interference optimization problem is modeled as a game problem based on satisfaction, and a distributed algorithm is used to obtain the resource allocation result. Each small base station reasonably allocates different resources for each requesting user. The power and sub-bandwidth can optimize the system interference. The invention effectively reduces the network interference, ensures the user's communication requirements, and has good convergence.

Description

technical field [0001] The invention belongs to the field of wireless networks, in particular to an interference management self-optimization method based on non-orthogonal multiple access. Background technique [0002] Ultra-dense networking technology can effectively increase network capacity and expand network coverage by deploying low-power small base stations on a large scale in hotspot areas, and has become one of the key technologies of 5G. Ultra-dense networking improves the network throughput by reducing the path loss between the base station and the end user. It not only increases the effective received signal, but also amplifies the interference signal. At the same time, low-power small base stations with different transmission frequencies are deployed overlappingly with the macro base station. The sharp increase in cell density makes interference extremely complicated. How to effectively eliminate interference and coordinate interference has become a key issue t...

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Problems solved by technology

However, as the useful signal strength increases, the interference problem caused by adjacent small base stations becomes more complicated. At the same time, considering the deployment of a large number of small base stations, the traditional centralized optimization scheme will generate large signaling overhead, which is no longer applicable; in addition , in order to further improve the utilization of spectrum resources, non-orthogonal multiple access technology is introduced into ultra-dense networks. Due to the active introduction of interference information, signals are multiplexed and transmitted on the same spectrum resources, which puts forward higher requirements for interference management. Research, the existing interference optimization scheme is no longer applicable

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