Cross-layer design-based method for determining wireless network coding participation packet

Abstract

The invention discloses a cross-layer design-based method for determining a wireless network coding participation packet, and belongs to the field of wireless networks using network coding technology and having overall uniform clock mechanisms. The method comprises three steps, namely cross-layer acquisition and storage of packet transceiving time, transmission of coding operation participation packet transceiving time and determination of a decoding operation participation packet. The method realizes accurate determination of the network coding operation participation packet with low communication overhead, and ensures accuracy and reliability of network coding operation; and compared with the conventional wireless network coding operation participation packet determining method, the consumption of network bandwidth resources is reduced and the utilization rate of bandwidth is improved at the same time of ensuring the practicability and the extendibility of the method.

Description

technical field [0001] The invention belongs to the wireless network field using network coding technology, and specifically relates to a plurality of wireless network nodes using unified time information, and a method for determining wireless network coding participating in groups based on cross-layer design adopted in these wireless network nodes. Background technique [0002] Network Coding (Network Coding, NC) is a network information transmission technology proposed by R. Ahlswede et al. (see literature: R. Ahlswede, N..Cai, S.-Y. R. Li, R. W. Yeung. Network Information Flow[J ]. IEEE Transactions on Information Theory, Vol.46, No.4, July 2000:1204-1216.). In a wireless communication network, due to the limited communication distance of wireless nodes and other reasons, the communication between the source and destination nodes needs to be forwarded by intermediate nodes for multi-hop transmission to achieve communication. According to the communication mode of the tra...

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Problems solved by technology

[0005] However, judging from the above-mentioned literature and research status, although people have obtained some research results in aspects such as MAC protocol optimization, broadcast operation, and selection of encoding groups, but in determining the groups involved in the decoding operation (hereinafter referred to as "decoding group", that is, the There are still problems in the "encoded packet" sent by the decoding node and used by the encoding node for network encoding: In the current wireless network encoding scheme, two methods are usually used to determine the packet participating in the decoding operation: (1) in a specific Under certain conditions, it is determined according to the order in which packets are sent and received. For example, after sending one packet within a period of time, only receive packets, and then use these sent and received packets to perform decoding operations. Many programs use this method; but this method is only applicable Due to some special network scenarios, it is lacking in applicability and scalability

(2) Add a serial number to each data packet transmitted, and determine the packets participating in the decoding operation according to the serial number. For example, the scheme designed by Xiao Xiao et al. above adopts this method; this method can meet the applicability of wireless networks. and scalability requirements, but will consume a certain amount of wireless network bandwidth

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