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Power control-based Ad Hoc network MAC (Media Access Control) layer channel allocation method

A channel allocation and control channel technology, applied in the field of Ad Hoc networks, can solve problems affecting the overall performance of the network, hidden terminals, data retransmission, etc., to achieve the effect of improving channel utilization and reducing conflicts

Inactive Publication Date: 2014-01-08
DALIAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

When the data transmission power of the interfering node reaches the maximum value, the interference radius of the node is greater than the transmission radius of the CTS frame, resulting in the phenomenon of hidden terminals, resulting in data retransmission and affecting the overall performance of the network

Method used

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  • Power control-based Ad Hoc network MAC (Media Access Control) layer channel allocation method
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  • Power control-based Ad Hoc network MAC (Media Access Control) layer channel allocation method

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Embodiment

[0039] figure 1 It is a working flow diagram of the present invention. In an Ad Hoc network, node A sends a data packet to node B, and proceeds as follows.

[0040] Step 1: Before node A sends data to node B, judge whether the following three sending conditions are satisfied according to the information table:

[0041] (1) Node B is at T DIFS +T RTS +T SIFS +T CTS It is idle after +2τ time, if there is no record of node B in the information table, the condition is automatically satisfied;

[0042] (2) There exists at least one data channel at T DIFS +T RTS +T SIFS +T CTS Idle after +2τ time;

[0043] (3) The control channel is at T DIFS After time is free.

[0044] When the above three conditions are met, node A sends the RTS frame with the maximum power; otherwise, node A needs to wait until the three conditions are met before sending the RTS frame.

[0045] Step 2: After Node B receives the RTS frame, it needs to calculate the minimum power. In order to ensure ...

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Abstract

The invention discloses a power control-based wireless MAC (Media Access Control) layer channel allocation method, which belongs to the field of Ad Hoc networks. In a multi-channel Ad Hoc network, two transceivers are used by a network node, of which one is fixedly arranged in a control channel, and the other one jumps between different data channels. An RTS (Request To Send) frame and a CTS (Clear To Send) frame are transmitted at the control channel by using the maximum power; a DATA frame and an ACK (Acknowledgement) frame are transmitted at the data channels by using the minimum power. The minimum power is calculated according to the minimum receiving power threshold which can be correctly received and decoded by a receiving node. The transmitting powers of all nodes in a same collision domain are divided into different grades, and then a corresponding data channel is selected according to the grade of the minimum power, so that links with larger transmitting power difference are allocated to different channels, the adverse effect of asymmetric links in the same channel can be relieved, and the network throughput and the unit energy consumption throughput are improved. The concrete implementation CAPC (Channel Assignment with Power Control) protocol can be used as an MAC layer protocol of the channel selected by Ad Hoc network node equipment.

Description

technical field [0001] The invention belongs to the field of Ad Hoc networks, and relates to a channel allocation method of a wireless network MAC layer. Background technique [0002] Ad Hoc network is a kind of wireless self-organizing network, which has the characteristics of no center, dynamic topology change and limited resources and energy. It is widely used in personal communication, commercial applications and military fields. The MAC layer protocol of the Ad Hoc network allows network nodes in the same interference domain to transmit data in parallel on different channels. However, since the Ad Hoc network nodes use the distributed negotiation method to allocate channels, it will inevitably bring more network data packet collisions. , resulting in low network throughput and unit energy throughput, which can be alleviated by improving the MAC layer protocol of the network. The MAC layer protocol mainly solves the problem of how to allocate wireless channels among com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/04H04W72/04
Inventor 赖晓晨王克艰姚艳双惠煌董书瑾李赟周国乔史文哲陈思濛任延飞
Owner DALIAN UNIV OF TECH
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