Wireless local area network user-centered downward multi-point cooperative transmission method

Abstract

The invention discloses a wireless local area network user-centered downward multi-point cooperative transmission method. The method mainly solves the problem that in the prior art, disturbance for sites by a plurality of adjacent access points in an intensive wireless local area network cannot be effectively restrained. According to the technical scheme, the transmission method comprises the steps that the number of the other access points located in the same frequency band with an associated access point is counted by the sites, and whether or not the user himself is a cooperative transmission user is determined; a request for sending frame RTS are received by the cooperative transmission user, the poor signal quality is judged, and a management clearance sending frame MCTS is replied; after the management clearance sending frame is received by an access point of cooperation participation, and if the access point is in an idle state, a communication channel detection process is started by the access point and a main access point collectively; after that, a pre-coding matrix fed back by the sites is transmitted to an access point of cooperation participation by the main access point, and downward data is sent by the main access point and the access point of cooperation participation collectively. According to the wireless local area network user-centered downward multi-point cooperative transmission method, disturbance for users by the adjacent access points is avoided, the received power of the users and system capacity are increased, and the transmission method can be used for WLAN environment intensive deployment.

Description

technical field [0001] The invention belongs to the technical field of communication, and specifically relates to a downlink coordinated multi-point transmission method, which can be used for transmission when a wireless local area network uses a downlink coordinated multi-point CoMP function in an overlapping basic service set OBSS environment, and improves network throughput. Background technique [0002] In recent years, as human society has entered the information age, the traffic carried by wireless mobile networks has grown rapidly. According to the growth of mobile business volume in China Mobile Communications, it is predicted that by 2020, the domestic mobile business volume will increase by more than 1,000 times, and the number of smart terminals will exceed the population. The next-generation wireless local area network WLAN will play a very important role in wireless communication, and will be one of the main ways to provide large-capacity wireless communication....

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Problems solved by technology

[0005] When the network coverage is not very dense and the interference is not very serious, it can be optimized by adjusting various network parameters; however, in a densely deployed WLAN environment, due to the interference of multiple adjacent APs on the site STA, the above Anti-jamming solutions have limited effect

[0006] In response to the serious interference to STAs caused by multiple adjacent APs in a dense WLAN, related solutions have appeared in recent years. On the one hand, it is to reduce the transmit power of APs, such as dynamic power control technology, which is to receive data from the AP side. Based on the evaluation of indicators such as signal strength or signal-to-noise ratio, the transmission power is changed in time to reduce the number of edge users and the interference received by edge users. The number of users decreases, which is not conducive to the improvement of network throughput; on the other hand, adjacent APs are allowed to transmit alternately, such as the access point rotation mechanism. When one of the APs is working, its adjacent APs remain in a sleep state. Although this method can effectively avoid network conflicts, the system capacity will be greatly reduced

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