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Data retransmission method and system

A data retransmission and data packet technology, which is applied in the field of data retransmission system, can solve the problems of affecting retransmission efficiency, multi-energy, high wireless channel occupancy rate, etc., and achieve the effect of simple calculation and operation and no special requirements

Inactive Publication Date: 2010-05-26
TSINGHUA UNIV
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Problems solved by technology

In this way, the existing retransmission method needs to broadcast data packets multiple times for error handling, requires a large number of retransmission times, and has a high occupancy rate of the wireless channel, so it needs to occupy a large amount of bandwidth and consume more energy. thus affecting the retransmission efficiency

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  • Data retransmission method and system
  • Data retransmission method and system
  • Data retransmission method and system

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Embodiment Construction

[0068] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0069] In practice, network coding improves network performance by allowing information from different links to be coded and combined, enabling network nodes to perform both routing and coding functions. Under the new architecture of network coding, the concepts of coding and routing are integrated, and the network performance can reach the theoretical limit of maximum streaming. Therefore, the unreliability of wireless links and the broadcast characteristics of the physical layer are very suitable for the use of network coding methods.

[0070] Based on the above analysis, the inventor of this patent creatively proposed one of the core ideas of the embodiment of the present invention, that is, to use the broadcast characteristics...

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Abstract

The invention provides a data retransmission method and system. The method comprises the following specific steps: after receiving K original data packs, performing packet-loss detection by the receiving terminals and sending feedback report to the sending terminal when detecting packet-loss, wherein the feedback report contains packet-loss information of the receiving terminal and K is a naturalnumber; after sending W original data packs, generating a combined pack through network coding according to the received packet-loss information of all the receiving terminals by the sending terminal, wherein W is a natural number; and retransmitting the combined pack by the sending terminal. The method and system of the invention can be used to increase the data retransmission efficiency of wireless broadcast.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a data retransmission method and a data retransmission system used in wireless communication. Background technique [0002] Broadcast operation plays a very important role in wireless communication. It is not only the basis of on-demand routing protocol for route discovery, but also can be used as an effective means of transmitting unicast or multicast information. Compared with traditional wired communication, packet loss in wireless communication is more serious, so it has higher bit error rate and transmission delay. Therefore, appropriate strategies must be adopted in wireless communication broadcasting to improve the reliability of broadcasting operations. At present, retransmission technology is often used to improve transmission reliability. The idea of ​​common retransmission technology is based on: the sender obtains the error situation of the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04L1/16H04L1/00
Inventor 张婧垚樊平毅
Owner TSINGHUA UNIV
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