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Channel allocation method based on mobility predication in cognitive radio network

A cognitive radio and channel allocation technology, applied in wireless communication, network planning, electrical components, etc., can solve problems such as low effective channel utilization, no consideration of cognitive user mobility characteristics, poor system fairness, etc.

Active Publication Date: 2014-01-29
HARBIN INST OF TECH
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Problems solved by technology

[0004] The present invention aims to solve the problem of low effective channel utilization rate and poor system fairness caused by the traditional channel static spectrum allocation method without considering the mobility characteristics of cognitive users, thereby providing a mobility prediction-based channel allocation method in a cognitive radio network

Method used

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  • Channel allocation method based on mobility predication in cognitive radio network
  • Channel allocation method based on mobility predication in cognitive radio network
  • Channel allocation method based on mobility predication in cognitive radio network

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specific Embodiment approach 1

[0051] Specific implementation mode 1. Combination figure 1 Describe this specific implementation mode, a channel allocation method based on mobility prediction in a cognitive radio network, which is implemented by the following steps:

[0052] Step 1. Initialize. In the deployment area, randomly generate the position and velocity vectors of N (i=1:N) cognitive users (including size and orientation). Each cognitive user i predicts a continuous time period T p , during time period T pThe current available channels in the network are continuously available for cognitive user i; each cognitive user i calculates the interference time between itself and other cognitive users i′ (i′=1:N) as T p ′, note: i≠i′.

[0053] Randomly generate fixed geographic locations of M (j=1:M) authorized users, whose locations obey a uniform distribution. Each authorized user has a dedicated authorized channel corresponding to it, that is, each authorized user can use a corresponding authorized...

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Abstract

The invention relates to channel allocation technologies in cognitive radio technologies in communication systems, in particular to a channel allocation method based on mobility predication in a cognitive radio network. The channel allocation method aims to solve the problems that the effective channel utilization rate is low and system fairness is poor due to the fact that a traditional channel static spectrum allocation method does not consider the moving characteristics of cognitive users. The method comprises the steps that firstly, an available channel probability threshold alpha and an interference side probability threshold beta are set, each subgraph is predicated according to the interference relation between the mobile cognitive users, the available channel list of each cognitive user in the subgraphs is predicated according to the interference relation between the mobile cognitive users and authorized users, and therefore the predication topological graph of the whole network and the predicated available channel list of each cognitive user are obtained; then, in the view of fairness, channel allocation is carried out on the predication subgraphs one by one; according to the allocation of each subgraph, a maximum independent set is solved firstly, and then the channel allocation is uniformly carried out on nodes in the subgraphs. The channel allocation method is suitable for the channel allocation in the cognitive radio network.

Description

technical field [0001] The invention relates to the channel allocation technology in the cognitive radio technology in the communication system. Background technique [0002] Cognitive radio is considered as a viable smart technology for future 4G wireless networks or ad hoc networks. Cognitive users can opportunistically access authorized channels but cannot cause interference to corresponding authorized channels. This requires an effective and optimal data link layer scheduling scheme to quickly perform periodic dynamic channel allocation. Therefore, channel allocation, as a key link in its technical realization, has very important research significance. [0003] So far, models based on graph theory, game theory, and interference temperature have been used to solve the problem of spectrum allocation in cognitive radio networks, and some results have been achieved. However, the mobility characteristics of cognitive users are rarely considered in channel allocation scheme...

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Application Information

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IPC IPC(8): H04W16/14H04W72/04
Inventor 徐玉滨陈佳美马琳赵洪林崔扬
Owner HARBIN INST OF TECH
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