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Implement method of power control cognition MAC protocol based on time division multiple access (TDMA)

A technology of power control and implementation method, applied in the direction of wireless network protocol, network traffic/resource management, electrical components, etc., can solve the problems of complex protocol and low scalability

Inactive Publication Date: 2010-02-17
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

Method used

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  • Implement method of power control cognition MAC protocol based on time division multiple access (TDMA)
  • Implement method of power control cognition MAC protocol based on time division multiple access (TDMA)
  • Implement method of power control cognition MAC protocol based on time division multiple access (TDMA)

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0040] see first figure 1 To illustrate the superframe structure of the TDMA-PCCMAC protocol, each superframe consists of a reservation frame (Reservation Frame, RF), K information frames (Information Frame, IF) and an acknowledgment frame (Acknowledgment Frame, AF). Frames are synchronized with channel slots and are of equal length. Each RF contains a sensing slot (Sensing Slot, SS) and N reserved slots (Reservation Slot, RS), and each IF and AF contains N information slots (Information Slot, IS) and N Acknowledgment Slot (AS). Cognitive nodes perceive all data channels sequentially in the sensing time slot SS, and determine the data channels that can be used by themselves in the superframe. Due to network synchronization, all CR nodes are in the sensing state at the same time, which can avoid mutual interference between CR nodes and improve Perceptual ac...

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Abstract

The invention discloses an implement method of power control cognition MAC protocol based on time division multiple access (TDMA). The method comprises the following steps: adopting strict time slot division, finishing time slot allocation among node pairs by a three-way handshake manner, namely, reserving application, reserving confirmation and deciding sending; realizing collision-free transmission in node communication process; and introducing a power control mechanism to improve the reuse rate of cyber space. The method can eliminate problems of multiple channels hiding a send terminal, multiple channels hiding a receiving terminal and multiple channels exposing terminals, and can dramatically decrease the impact on network performance brought by the problem of multiple channels hidingthe send terminal. The simulation result indicates, compared with dynamic spectrum access MAC (DSA-MAC) protocol, the invention can effectively enhance network throughput and decrease access time delay with the increment of network business volume.

Description

technical field [0001] The invention belongs to the MAC (Medium Access Control) layer protocol design method of a cognitive Ad Hoc network in the technical field of wireless communication, and in particular relates to a power control cognitive MAC protocol based on time division multiple access (TDMA) using a synchronization and power control mechanism Implementation. 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 ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/18H04W72/04H04W80/02H04W84/18
Inventor 任品毅王熠晨吴广恩尹稳山汪瑞魏莉吕福顺
Owner XI AN JIAOTONG UNIV
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