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Resource-saving distributed multicast and frequency spectrum allocation method in CWMN (Cognitive Wireless Mesh Network)

A technology of resource saving and spectrum allocation, applied in the field of wireless network, can solve the problems of unseen structure and spectrum allocation, the problem of complex structure of resource-saving multicast routing tree, etc.

Inactive Publication Date: 2013-01-09
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]In CWMN, due to the randomness of primary users (PU) occupying authorized channels, the number of available channels perceived by CR-Mesh nodes is heterogeneous, which will It makes the problem of constructing resource-saving multicast routing tree in CWMN more complicated
After reviewing the relevant literature, there is no report on the construction of distributed multicast routing tree and spectrum allocation with the goal of resource saving to meet QoS constraints in cognitive wireless Mesh networks

Method used

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  • Resource-saving distributed multicast and frequency spectrum allocation method in CWMN (Cognitive Wireless Mesh Network)
  • Resource-saving distributed multicast and frequency spectrum allocation method in CWMN (Cognitive Wireless Mesh Network)
  • Resource-saving distributed multicast and frequency spectrum allocation method in CWMN (Cognitive Wireless Mesh Network)

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Embodiment 1

[0066] The goal of constructing the multicast tree and spectrum allocation in the present invention is to minimize the use of radio frequency resources, which is specifically achieved by minimizing the number of transmission times.

[0067] figure 2 Shown is a flow chart of the resource-saving distributed multicast routing and spectrum allocation method proposed by the present invention that satisfies QoS constraints. Proceed as follows:

[0068] S1-1 calculates the weights of all wireless links.

[0069] set up It is a new wireless multicast service, wireless multicast service source of , , . image 3 is a flow chart of wireless link weight calculation, including the following steps:

[0070] S2-1 initializes the weights of all wireless links to infinity, namely , .

[0071] S2-2 For nodes satisfying radio frequency constraints ,Right now , , first calculate the node The set of neighbor nodes satisfying the radio frequency constraints, namely ...

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Abstract

The invention discloses a distributed multicast routing and frequency spectrum allocation method, which satisfies QoS (Quality of Service) constraints in a cognitive wireless mesh network (CWMN) (Cisco Wireless Mesh Networking) and takes resources saving as an objective. The method mainly comprises the following steps of: 1, calculating weights of all wireless links; 2, structuring a resource-saving broadcast tree from source points to all destination nodes; and 3, pruning the resource-saving broadcast tree to obtain a resource-saving multicast tree, and carrying out frequency spectrum allocation. According to the invention, the structuring and frequency spectrum allocation problems of a distributed multicast routing tree which satisfies the QoS constraint in the CWMN and takes resource saving as the objective are solved, the multicast tree satisfying the QoS constraint can be structured, in addition, the radio-frequency resources used by the multicast tree are minimized, so that the radio-frequency resources are effectively reduced in usage and the purpose of resource saving is achieved.

Description

technical field [0001] The invention belongs to the technical field of wireless networks, and relates to a resource-saving distributed multicast routing and frequency spectrum allocation method satisfying QoS constraints in a cognitive wireless Mesh network. Background technique [0002] In a cognitive wireless mesh network (cognitive wireless mesh network, CWMN), each Mesh node uses cognitive radio (cognitive radio, CR) technology. For each Mesh node equipped with CR (CR-Mesh router, CR-Mesh gateway , CR-Mesh terminal), capable of sensing unused spectrum in the main system, and dynamically accessing these available spectrum. [0003] The present invention mainly considers the resource-saving distributed multicast routing and frequency spectrum allocation method under the condition that the CR-Mesh node has obtained the available channel. [0004] Resource-saving multicast routing tree construction and spectrum allocation focus on how to make full use of the characteristics...

Claims

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Application Information

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IPC IPC(8): H04W4/06H04W16/14H04W84/18H04L12/761H04L12/753H04L45/16
Inventor 邝祝芳
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY