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Single-antenna MAC(multi-access computer) transmission method based on network characteristic in cognitive wireless sensor network

A sensor network and wireless sensor technology, applied in the direction of wireless network protocol, wireless communication, network topology, etc., can solve the problems of less consideration of the influence of the main user, can not be directly applied, can not be directly applied, etc., to achieve simple use Convenience, the effect of overcoming the "blind" state problem, and overcoming the multi-channel hidden terminal problem

Inactive Publication Date: 2013-01-23
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] To sum up, most of the current cognitive MAC protocols cannot be directly applied to CRSN. The main reason is that some MACs require nodes to have multiple antennas, and due to low power requirements, wireless sensor networks usually Only allows a node to be equipped with a single antenna; at the same time, the current multi-channel MAC protocol rarely considers the influence of the primary user, so it cannot be directly applied to the network that coexists with the primary user

Method used

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  • Single-antenna MAC(multi-access computer) transmission method based on network characteristic in cognitive wireless sensor network
  • Single-antenna MAC(multi-access computer) transmission method based on network characteristic in cognitive wireless sensor network
  • Single-antenna MAC(multi-access computer) transmission method based on network characteristic in cognitive wireless sensor network

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Embodiment

[0038] In this embodiment, a network scenario with 7 channels is taken as an example. There are 48 nodes in the network, half of which are sending nodes and half of which are receiving nodes. Nodes generate data packets of three different lengths with equal probability, 300Bytes, 600Bytes and 900Bytes respectively. There are three kinds of utilization ratios of the data channel by the primary user, which are 0.1, 0.3 and 0.6 respectively, and the numbers of the three data channels are equal. The maximum interference tolerance time of the primary user is 2.4ms, and the average time length of the data channel in idle state is 15ms.

[0039] Such as Image 6 Shown, the specific steps of this embodiment are:

[0040] 1) The node generates a data packet and starts the backoff process.

[0041] When a node has a data packet with a length of 3 Units after the datagram is divided, that is, a data transmission unit to be sent, the node randomly selects a period of time to back off b...

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Abstract

The invention discloses a single-antenna MAC transmission method based on network characteristic in cognitive wireless sensor network. The single-antenna MAC transmission method comprises the steps of performing user-permission competition treatment to wireless sensor nodes of all users on a control channel of the CRSN (cognitive radio sensor network) to acquire a data channel to be used; gradually transmitting data packets to be sent by the data channel to be used according to data transmission unit one by one; and starting inside data channel timer by wireless sensor nodes of the sending end and receiving end of the data packet to be sent, and returning to the first step to re-send the left data packets until all data packets are sent. According to the single-antenna MAC transmission method, enables the wireless sensor node realizes the improvement of the performances of handling capacity and average transmission time delay in a con-existing network with the master user.

Description

technical field [0001] The present invention relates to a method in the technical field of wireless communication, in particular to a single-antenna MAC transmission method based on network characteristics in a cognitive wireless sensor network. Background technique [0002] Since the frequency band in which the wireless sensor network operates is an unlicensed frequency band, more and more wireless communication technologies share this frequency band, causing the frequency band to become more and more crowded. Cognitive radio technology has been introduced into wireless sensor networks as a good technology to solve the limited spectrum resources. Cognitive Wireless Sensor Networks (CRSN) have begun to be deeply studied, and MAC protocol design in CRSN is a key research direction. [0003] D.Cavalcanti, S.Das, Jianfeng Wang and K.Challapali's document "Cognitive Radio based Wireless Sensor Networks (Wireless Sensor Networks based on Cognitive Radio Technology)" is disclosed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04W80/02H04W84/18
Inventor 周桂寅何晨蒋铃鸽田军吕超
Owner SHANGHAI JIAO TONG UNIV
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