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Data retransmission method and device

A data retransmission and data technology, applied in the communication field, can solve the problems of high data packet complexity and limited space for error correction performance improvement, and achieve the effect of improving throughput and reducing complexity.

Active Publication Date: 2011-05-11
宜宾市美捷通讯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention is proposed in view of the problems existing in the data retransmission method in the related art that the complexity of deciphering the data packet at the receiving end is high and the space for improving the error correction performance is limited. Therefore, the main purpose of the present invention is to provide a data retransmission Method and device to solve at least one of the above problems

Method used

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  • Data retransmission method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Suppose there are K original data packets (K is a positive integer greater than 1) waiting to be transmitted, and M retransmission packets (or redundant packets, redundant data packets) are used to restore the original data packets lost during transmission, where M is a positive integer, and 1≤M≤func2(K / 2)+1, func2(x) indicates that x is rounded down to an integer.

[0048] Suppose there are K original data packets (abbreviated as original packets), which are recorded as P according to the sequence 1 , P 2 ,...,P K , wherein, K is a positive integer greater than 1; and set the K first packets obtained by the method provided by the method embodiment as Q 1 , Q 2 ,...,QK , and the obtained M redundant packets are Q K+1 , Q K+2 ,...,Q K+M . The K initial packets and M redundant packets will be sent within a time period (the time period includes one or more scheduling cycles), and the receiving end receives these initial packets and redundant packets according to the...

example 1

[0065] The following uses this example to combine image 3 The process of generating the first transmission packet and the redundant packet through the above data retransmission method will be described in detail.

[0066] Set 8 original data packets (abbreviated as original packets), which are recorded as P according to the sequence 1 , P 2 ,...,P 8 ; And let the 8 first transmission packets obtained by the data retransmission method of embodiment one be Q 1 , Q 2 ,...,Q 8 , the obtained 4 redundant packets are Q 9 , Q 10 , Q 11 , Q 12 . The 8 initial packets and 4 redundant packets will be sent within a time period (the time period includes one or more scheduling cycles), and the receiving end receives these initial packets and redundant packets according to the relevant signaling messages .

[0067] The process of generating the first transmission packet and the redundant packet through the data retransmission method provided by Embodiment 1 is as follows:

[00...

example 2

[0076] The following uses this example to combine Figure 4 The process of generating the first transmission packet and the redundant packet through the above data retransmission method will be described in detail.

[0077] Set 13 original data packets (abbreviated as original packets), which are recorded as P in order 1 , P 2 ,...,P 13 ; And suppose, the 13 first transmission packets obtained by the data retransmission method of embodiment one are Q 1 , Q 2 ,...,Q 13 , and the resulting 5 redundant packets are Q 14 , Q 15 , Q 16 , Q 17 , Q 18 . The 13 initial packets and 5 redundant packets will be sent within a time period (the time period includes one or more scheduling cycles), and the receiving end receives these initial packets and redundant packets according to the relevant signaling messages .

[0078] The process of generating the first transmission packet and the redundant packet through the data retransmission method provided by Embodiment 1 is as follow...

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Abstract

The invention discloses a data retransmission method and a data retransmission device. The method comprises: a transmitting end performing network coding to obtain coded data, wherein the coded data comprises K first transmission data packets, the K first transmission data packets Q1, Q2, ..., and QK are generated according to K original data packets P1, P2, ... and PK arranged according to the transmitting order, and when i is smaller than or equal to the preset coded packet number N, Qi=P1 xor -xor Pi, and when i is greater than the coded packet number, Qi=Pi-N+1 xor -xor Pi, K is a positive integer, N is a positive integer, and N < K, and 1<=i <=K; and the transmitting end transmitting the coded data to a receiving end so that the receiving end realizes multimedia broadcast service according to the coded data. The method and the device promote the error correction performance and the throughput of a system, and meanwhile reduce the complexity when the receiving end resolves the data packets.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a data retransmission method and device. Background technique [0002] Multicast Broadcast Service (MBS for short) is a technology for transmitting data from one data source to multiple targets, which can realize the sharing of network resources and improve the utilization rate of network resources (especially air interface resources). With the popularization of the Internet and the development of multimedia technology, the application of multimedia sharing services is becoming more and more extensive, and the amount of data is also increasing. Efficient transmission of multicast and broadcast services has become very important for the next generation of mobile communication systems . [0003] In MBS, when a data source transmits data to multiple targets, due to channel noise or interference, data may be lost during transmission, or the received data may be discarded when it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04W4/06H04W28/04
Inventor 龚贤卫徐俊许进吕开颖孙波
Owner 宜宾市美捷通讯科技有限公司