Network switching side control method for terminal group access network based on cognitive radio

Abstract

The invention discloses a network switching side control method for a terminal group access network based on cognitive radio, comprising the following steps that: each user terminal (CEP(Central Processing Element)) broadcasts own bandwidth request messages to accessible base stations (BS) through a public control channel according to own spectrum sensing result, traffic demand, own signal-to-noise ratio and access probability of a plurality of base stations; after receiving the request messages, the base stations transmit the messages to a network switching manager at a core network side; the core network quickly solves a cognitive terminal group network distribution scheme, in which load on each base station is balanced, through a chaos optimization algorithm according to the messages, and transmits the result to the base stations to which the CPEs access; and the base stations finish the network switching for the user terminal group by sending an access response message to corresponding CPEs. With the method, frequent network switching in the radio network of the prior art is reduced, and a plurality of CPEs, which need to be switched between networks simultaneously, can access to the network meeting own communication demands, more fairly.

Description

technical field [0001] The invention belongs to the technical field of wireless area network optimization, and in particular relates to a network side control method for terminal group access network (RAN, Radio Access Network) switching in a load balancing-oriented cognitive radio network, which can be used to solve the problem of multiple cognitive user terminals When the network switching request is issued at the same time, the base station congestion caused by lack of coordination and the frequent network switching of some user terminals. Background technique [0002] Most of the existing wireless networks are based on a fixed spectrum allocation scheme, that is, the relevant government departments authorize the frequency band to the licensee, allowing it to be used for a long time within a certain geographical range. According to the statistics of the Federal Communications Commission (FCC), quite a large number of authorized wireless frequency bands are not fully utili...

AI Technical Summary

Problems solved by technology

However, when these user terminals send access requests at the same time, due to the lack of coordination among them, they are likely to send access requests to the same BS at the same time, causing the BS to be overloaded, and some CPEs cannot be accessed. Response, these CPEs that have not received a response have to re-send access requests to other BSs

Similarly, these CPEs that have not received a response may also send access requests to another BS at the same time, causing the subsequent BS to be overloaded, so that there will be CPEs that continue to make access requests, resulting in frequent network handovers and frequent network switching between CPEs. Unfair switching between networks

Even if the simultaneous access requests of multiple CPEs do not exceed the capability of the BS, if these CPEs all work in a frequency range, the emergence of authorized users in this frequency range will cause large-scale network switching

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