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Cognitive-flow-based cooperative MAC (medium assess control) method

A medium access control and cooperative node technology, applied in the direction of network traffic/resource management, electrical components, wireless communication, etc., to achieve the effect of improving performance

Active Publication Date: 2014-07-02
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on throughput as a criterion, cooperative nodes are selected to assist in data transmission, and a new cognitive traffic-based cooperative MAC (TC-MAC) method is proposed to effectively solve the cooperative communication problem between hidden terminals in existing cooperative communication networks

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Embodiment Construction

[0015] Based on the existing MAC mechanism, the present invention selects cooperative nodes to assist in data transmission based on throughput, and firstly modifies control frames to realize cooperative communication in order to better assist data frame transmission.

[0016] The implementation of the present invention will be specifically described below in conjunction with the accompanying drawings and specific examples.

[0017] figure 1 It is a system model diagram in the present invention. When node S S Whether to select a node when there is data to be transmitted As a cooperative node, it is necessary to comprehensively consider the link and The channel state information and node The influence of neighbor nodes competing for the channel. Only one pair of data streams S is considered in the following 4 →S 5 to collaborating nodes The performance impact of . This patent comprehensively considers channel state information and data flow S 4 →S 5 link and ...

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Abstract

The invention discloses a cooperative MAC (medium access control) method and relates to an MAC method for a wireless network. According to the invention, on the basis of the traditional MAC mechanism, channel state information and service occupation condition of nodes are taken into consideration in cooperative node selection, and cooperative nodes are selected according to throughput used as a criterion to assist data transmission. A new cognitive-flow-based cooperative MAC (TC-MAC) method is provided for effectively realizing hiding of cooperative communication between terminals in the traditional cooperative communication network. According to the channel state information and idle time ratio of neighboring nodes, two-hop channels for high-speed transmission are selected by the nodes, therefore the system performance is improved effectively.

Description

technical field [0001] The invention relates to a MAC (Medium Access Control, medium access control) method of a wireless network, in particular to a new cooperative MAC method, which jointly considers channel state information and node service occupancy conditions to select a cooperative node. Background technique [0002] In wireless networks, interference and signal fading are the main factors affecting the performance (such as throughput) of mobile communication systems. MIMO (Multiple Input Multiple Output) technology achieves a higher hierarchical order by combining multiple signals to increase channel capacity. However, due to the limitations of portable mobile terminals (such as mobile phones) in terms of volume, weight, power consumption, and production costs, it is very difficult for the MIMO technology to be applied in practice. Aria Nosratinia et al. proposed cooperative communication in IEEE Communications Magazine 2004, that is, cooperative nodes assist source...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W28/24H04W74/08
Inventor 李云刘期烈张正华杜杨
Owner CHONGQING UNIV OF POSTS & TELECOMM