Access control method for distributed CDMA network medium with controllable power

Abstract

The invention provides a distribution type CDMA network media access control method with controllable power. When a node has data to send, a public code is used for sending RTS grouping, a receiving node uses the public code for receiving RTS grouping sent by the sending node, signal-noise ratio of the grouping is counted, if signal-noise ratio is higher than or equal to threshold signal-noise ratio, the receiving node feeds back power control information to the sending node through CTS grouping; on the other hand, the receiving node does not loop-back CTS grouping, the sending node adds transmitted power for re-transmitting RTS grouping. The sending node adjusts transmit power for transmitting data grouping to the receiving node after receives CTS grouping. The receiving node replies confirming ACK grouping after receives data grouping. When network node has no data to send, the public code is used for receiving control grouping, and corresponding treatment is processed according with received control grouping type. Under the condition of not increasing node hardware cost, the method provide by the invention can reduce average transmit power of network node, and increase space multiplexing degree of network, furthermore, network throughput is increased.

Description

technical field [0001] The present invention relates to a distributed CDMA network medium access control method with controllable power, in particular to a distributed CDMA network medium access control method with controllable power by using common spreading codes to interactively control groups. The invention belongs to the technical field of distributed network media access control. Background technique [0002] In distributed wireless communication networks such as self-organizing networks (Ad Hoc), wireless sensor networks, mesh networks, and multi-hop cellular networks, there is generally no central control station, so the use of wireless resources cannot be centralized. For unified scheduling and allocation, each network node can only decide whether and how to use wireless communication resources. The rules and basis for network nodes to use wireless communication resources have an important impact on network throughput and resource utilization efficiency. Especiall...

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Problems solved by technology

However, in a distributed wireless communication network, since there is no dedicated centralized controller to complete the functions of the base station, the centralized power control method is not applicable, and only a node power scheduling method suitable for a distributed CDMA network can be designed.

[0005] Through literature retrieval to prior art, it is found that "Power controlled dual channel (PCDC) medium access protocol for wireless Ad Hoc networks," published by A.Muqattash et al. in "IEEE INFOCOM'2003" pp.470-480, 2003, ( IEEE 2003 International Conference on Information and Communication, March 2003, pages 470 to 480, a power-controlled dual-channel media access control protocol for Ad Hoc networks), proposed a dual-channel-based power regulation In this method, each node uses two different frequency channels to send control packets and data packets, which requires each node to be able to listen to data on one channel and send data on another channel at the same time, to achieve this This function needs to be equipped with two transceiver modules for each node, which is difficult to realize

"Jointopportunistic power scheduling and end-to-end rate control for wireless Ad Hocnetworks" ( IEEE Transactions on Automotive Electronics, March 2007, Vol. 56, pages 801 to 809, joint opportunistic power scheduling and end-to-end rate control in wireless Ad Hoc networks) proposed joint power scheduling and end-to-end rate control The node power scheduling algorithm, this method solves the power scheduling problem of the Ad Hoc network to a certain extent, but this method requires a central controller in the network to implement the power and rate scheduling algorithm, because the nodes in the Ad Hoc network It is a peer-to-peer node, and there is no central node that performs scheduling functions, so the method proposed in this paper is difficult to implement in the actual design of Ad Hoc networks

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