Spectrum Handover Method in Cognitive Heterogeneous Radio Networks

Abstract

The invention discloses a spectrum switching method in a cognitive heterogeneous radio network. In order to solve the problem that the service delay of a secondary user is large, The method comprisesthe following steps: firstly, fusing an open wireless network utilizing an unlicensed frequency band and a cognitive radio network utilizing the licensed frequency band opportunistically, and proposing a cognitive heterogeneous wireless network (CHWN) scene; Secondly, on the basis of historical channel information of the heterogeneous network, the secondary user classification idea is adopted, andthe time delay performance of secondary users is optimized; And finally, a preemptive M / G / 1 queuing model and a non-preemptive M / G / 1 queuing model are fused, the spectrum switching process of the secondary user is modeled, the extended data transmission time delay is analyzed, and a dynamic adaptive spectrum switching strategy with the minimum time delay is further provided.

Description

technical field [0001] The invention belongs to a spectrum switching modeling method in a heterogeneous cognitive wireless network and belongs to the field of mobile communication. In particular, it relates to a dynamic adaptive spectrum switching strategy based on sub-user classification. Background technique [0002] With the wide application of wireless technology in mobile communication, public safety, and broadcasting television, non-renewable wireless frequency band resources are becoming increasingly scarce. However, the fixed authorized frequency band allocation strategy leads to low utilization of frequency band resources. Cognitive radio allows the secondary user to opportunistically access the idle frequency band of the primary user without affecting the primary user PU (Primary User), improving frequency band utilization. When the primary user arrives at the channel occupied by the secondary user SU (Secondary User), in order to avoid interference to the primar...

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Problems solved by technology

Literature [LERTSINSRUBTAVEE A, MALOUCH N, and FDIDA S. Controlling Spectrum Handoff with a Delay Requirement in Cognitive Radio Networks [C]. International Conference on Computer Communications and Networks, Munich, Germany, 2013.1-8.] proposed a new spectrum switching mechanism to obtain Optimal channel, using the backhaul channel to reduce the repeated spectrum switching process, but does not consider the priority of secondary users

[0004] The application environment of the above literature is mostly a single cognitive radio network SCRN (Single Cognitive RadioNetwork). In this context, the service quality of secondary users is limited by the user's traffic and the number of available channels.

With the explosive growth of mobile traffic, the traffic of secondary users and primary users increases accordingly, resulting in a sharp increase in the demand for frequency bands for secondary users, while the number of available channels for secondary users decreases, and system performance deteriorates severely

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