Distributed multiple-channel multiple-access method based on parallel cooperation

Abstract

The invention provides a distributed multiple-channel multiple-access method based on parallel cooperation, relating to the technical field of communication. In the invention, a handshaking process and a data transmission process are mainly controlled; the handshaking process is controlled as follows: after a node is successful in competition in a common control channel according to a distributed coordination function mechanism, a source node and a target node interact control information in a control channel, such that data processing is completed; and the data transmission process is controlled as follows: a transceiving node and a cooperation node complete transmission of data packets in a negotiated data channel according to a cooperation strategy. Because the transceiving node in a network only needs a set of transceiver, the implementation process is simple; because cooperation transmission is adopted, the number of the data packets transmitted in each TXOP is increased; the network throughput is greatly increased; the average packet delay is reduced; and in addition, a distributed working manner is adopted, such that a central control node and the whole-network time synchronization are unnecessary.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a multiple access method in a multi-channel environment. Background technique [0002] At present, multiple available frequency channel resources have been provided in the IEEE802.11 standard. For example, there are three non-overlapping channels of 20MHz in the 2.4GHz frequency band, and more than 20 non-overlapping available channels of 20MHz in the 5GHz frequency band. And with the continuous growth of the number of mobile users and the continuous increase of users' demand for large-bandwidth services, such as video conferencing and other services, channel resources become more and more tense. Therefore, how to design an efficient multi-channel multiple access (Multi-channel MAC, McMAC) protocol to maximize the use of the current limited channel resources has become a research hotspot of concern. However, due to the fading characteristics of the wireless channel, when t...

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Problems solved by technology

Although the parallel cooperation method can effectively increase the data transmission rate and reduce the packet delay, there are still many problems in this protocol: first, the protocol is based on time synchronization, which is difficult to implement and has high complexity; second, CoopMC It is assumed that the sending and receiving nodes in the network have already known the best cooperative node information in advance, which is inconsistent with the actual situation; third, the protocol cannot adapt to the dynamic change of the number of available channels in the network

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