Channel and power joint distribution method for guaranteeing communication continuity in cognitive radio

Abstract

The invention discloses a channel and power joint distribution method for guaranteeing communication continuity in cognitive radio. The method includes that S1, a cognitive user periodically perceives radio environment, and a cognitive base station obtains sub-channel state information; S2, a cognitive user sends a communication request to the cognitive base station and informs the cognitive base station of amount of information required to be transmitted, and simultaneously the cognitive base station acquires service quality demand information of the cognitive user; S3, the cognitive base station distributes optimum channel and power of an initial phase for the cognitive user through solving an optimization problem, and the cognitive user starts to communicate; S4, when the communication of the initial phase is finished, the sub-channel state information and the service quality demand information are updated; S5, the cognitive base station performs the optimal joint distribution of channel and power of i phase; and S6, the cognitive user continues to periodically perceiving surrounding radio environment, and the optimal distribution of the channel and power of subsequent phases is achieved. The method can guarantee the communication continuity of the cognitive user at different resource distribution phases.

Description

technical field [0001] The invention relates to a channel and power joint allocation method for ensuring communication continuity in a cognitive radio, belonging to the field of wireless communication. Background technique [0002] Radio spectrum resource is a precious non-renewable resource. With the development of wireless communication technology, the shortage of spectrum resources has become one of the main problems faced by the current communication field. On the one hand, the rise of wireless network technologies such as wireless local area network, wireless personal area network and wireless metropolitan area network has made people's demand for wireless spectrum resources increasing, and the contradiction between spectrum supply and demand has become increasingly prominent; on the other hand, many allocated frequency bands are in the Mostly underused. According to the data provided by the US Federal Communications Commission (FCC) in 2003, the utilization rate of t...

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned joint channel and power allocation methods of cognitive radio, although the interference of cognitive users to primary users and the quality of service of cognitive users are taken into account, these methods all solve problems in a certain radio environment. channel and power resource allocation problem, but did not consider the multi-stage channel and power joint allocation problem; and did not consider the communication continuity problem of cognitive users, under these allocation mechanisms, cognitive users in each spectrum allocation stage It is necessary to switch channels frequently, which not only consumes energy, but also cannot guarantee the continuity of front-to-back communication

Images