Wireless cooperation relay network reliable multicast transmission method and system
A technology of cooperative relay and transmission method, which is applied in the direction of transmission system, digital transmission system, broadcast service distribution, etc. It can solve the problems of high packet error rate, poor reliability, and inability to ensure that all multicast packets reach their destinations, and achieve guaranteed Reliability, improve utilization, and reduce the effect of retransmission times
Inactive Publication Date: 2011-09-28
THE PLA INFORMATION ENG UNIV
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[0006] The purpose of the present invention is to overcome the high packet error rate in the transmission process of the existing wireless network multicast method, the reliability is poor, there is no direct wireless link between the source and the destination, and the multicast packet cannot be guaranteed. All reach the destination defects, thus providing a wireless network multicast transmission control method with high reliability and low packet error rate
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[0030] In the embodiment of the present invention, the application of cooperative communication technology and network coding technology in the process of error retransmission to achieve a reliable transmission control system for information has no special requirements for the original physical layer facilities. In other words, this The following embodiments of the invention can be applied to currently available physical layer facilities.
[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0032] see figure 1 , which shows a schematic plan view of an embodiment of the wireless cooperative relay network reliable multicast transmission system of the present invention. In this embodiment, a node S that exists in the space is set as the multicast source and a group of nodes (D1, D2) as the multicast destination, there is no direct link between the node S and the nodes D1, D2, and the node S Info...
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The invention provides a wireless cooperation relay network reliable multicast transmission method, comprising that a multicast source node selects the best relay node from a relay node set and separately transmits each data group to the best relay node selected; a verification is carried out towards the data groups and a retransmission of data is requested to the multicast source node for the data groups in which errors are found out during the verification; the relay node broadcasts the data groups which pass the verification to each multicast target node; after the multicast target nodes receive the data groups, a verification is carried out towards the data groups and the information of the data groups which do not pass the verification is returned to the relay node set; the relay node set carries out a network coding again towards the data groups in which errors are found out after transmission and rebroadcasts the data groups to the multicast target nodes; the multicast target nodes carry out a decoding and verification towards the rebroadcasted network coding, reply confirmation messages and end operation when correct, otherwise send a feedback to the relay set and wait for the next retransmission till all the data groups are correctly received or the maximal retransmission time is reached.
Description
technical field [0001] The invention relates to the field of wireless network transmission, in particular to a reliable multicast transmission method and system for a wireless collaborative relay network. Background technique [0002] Multicast refers to a network communication method in which a single sender corresponds to multiple receivers. In multicasting, network traffic can be reduced in situations where multiple recipients are simultaneously listening to or viewing the same resource by delivering a single stream of information to multiple recipients. In a wireless network, the phenomenon of using multicast to transmit information is also called wireless network multicast transmission. [0003] Compared with wired network multicast transmission, due to the influence of wireless channel fading characteristics, there is a high packet error rate and poor reliability in the wireless network multicast transmission process; and in the environment of large channel fading, th...
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IPC IPC(8): H04W4/06H04L1/00H04L1/16
Inventor 刘洋李欧于宏毅冯强孙武剑王晓梅
Owner THE PLA INFORMATION ENG UNIV