Multichannel diversity-based cognitive medium access control realizing method

An implementation method and multi-channel technology, applied in the field of wireless communication, can solve the problems of complex protocols and low scalability

Inactive Publication Date: 2011-04-27
XI AN JIAOTONG UNIV
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Problems solved by technology

The C-MAC (Cognitive MAC) protocol, which is a representative of the time slotting protocol, is obtained by adding the CR function on the basis of modifying the MMAC protocol. By strictly dividing the beacon period into time slots, each neighbor node is assigned a unique Time slots can be used to improve network throughput, but the protocol is more complex and has lower scalability

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  • Multichannel diversity-based cognitive medium access control realizing method
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  • Multichannel diversity-based cognitive medium access control realizing method

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Embodiment Construction

[0060] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0061] see first figure 1 To illustrate the division of channel time slots, each channel time slot is divided into two parts: "sensing period" and "data transmission period". In the sensing period, the node senses all data channels in turn, and determines the data channels not used by the primary user in the current time slot. During the data transmission period, the node uses the data channel not used by the primary user to complete packet transmission.

[0062] see below figure 2 To illustrate the content and functions contained in the data channel usage list DCUL, each entry contains five parts. The "channel number" indicates which data channel the entry record information corresponds to. "PU Status" indicates whether the channel is occupied by the primary user, "0" indicates that it is not occupied, and "1" indicates that it is occupied. "Neighbor n...

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Abstract

The invention discloses a multichannel diversity-based cognitive medium access control realizing method, which is designed on the basis of multichannel diversity. In the method, source nodes and target nodes compete for the right of use of a data channel through exchange control packets on a public control channel, node pairs wining the competition determine data channels and corresponding power allocation for the transmission according to power/channel combined allocation and are shifted to corresponding data channels to transmit a plurality of data packets continuously. The invention also provides a method for resolving power/channel combined allocation, which is to resolve the power/channel combined allocation by converting the power/channel combined allocation into a multi-choice knapsack problem and by dynamic planning. Simulation results show that the cognitive MAC protocol can effectively improve intra-node pair data transmission rate and network throughput under a condition that the total transmission power is limited compared with an opportunistic multiradio MAC (OMMAC) protocol.

Description

technical field [0001] The invention belongs to a method for designing a MAC (Medium Access Control) layer protocol of a cognitive Ad Hoc network in the technical field of wireless communication, and in particular relates to a method for realizing a cognitive MAC protocol based on multi-channel diversity. Background technique [0002] With the rapid development of wireless communication technology, spectrum has become an increasingly scarce resource. The traditional fixed spectrum allocation method leads to resource waste and low spectrum utilization, which has become a key factor restricting the further development of wireless communication networks. Cognitive radio technology has the ability to detect the occupancy of the licensed frequency band by primary users and implement dynamic spectrum access, which can effectively solve the above problems. Introducing cognitive radio technology into wireless Ad Hoc networks is an emerging research field in recent years. Designing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04W80/02H04W84/18
CPCY02D30/70
Inventor 任品毅王熠晨吴广恩龚敏康尹稳山晏双成张世娇
Owner XI AN JIAOTONG UNIV
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