Fountain code-based collaboration multicast method

一种协作多播、喷泉码的技术，应用在多播领域，达到提高容量、加快速率的效果

Inactive Publication Date: 2012-08-01
XI AN JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the existing multicast system is limited to the user with the worst link; propose a cooperative multicast method based on fountain codes, under the premise of ensuring that all users receive multicast data reliably , to further increase the capacity of the multicast system by means of cooperation

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  • Fountain code-based collaboration multicast method
  • Fountain code-based collaboration multicast method
  • Fountain code-based collaboration multicast method

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation examples.

[0030] The fountain code uses a linear encoding and decoding method, which allows the source to continuously generate encoding symbols, and does not stop encoding and sending until it receives feedback from the user that it is correctly received. It is a channel encoding that increases transmission reliability. The base station does not need to know the user's channel state information, but can still guarantee the characteristics of reliable data transmission, especially suitable for use in multicast systems. After the base station uses fountain code encoding, different users complete data reception at different times. At this time, users who complete data reception first can cooperate to forward data for users who have not completed data reception, which can further increase the capacity of the system.

[0031] The core i...

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Abstract

The invention provides a fountain code-based collaboration multicast method. The method comprises the following steps that: 1) a base station sends out encoded symbols formed by encoding a data packet by fountain codes, and finishes sending the data in the round after receiving correctly decoded feedback of all users; 2) after finishing receiving the data, the users under a good channel condition intercept help seeking signals of other users; when receiving the help seeking signals, the users participate in collaboration; and when receiving the correctly received feedback of the users collaborated with the user under the good channel condition, the users stop collaborating; and 3) the users who have not finished receiving the data intercept correctly received feedback signals of remaining users, and judge whether to send a help seeking signal according to the signal intensity of the feedback signals. According to the method, reliable transmission which does not need to be retransmitted is provided by using the fountain codes; and simultaneously system capacity is improved by combining a collaboration mode. According to the fountain code-based collaboration multicast method, collaboration participation and exit conditions of the users are also given; energy consumption of user collaboration is reduced; and the service life of network is prolonged.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a multicast method. Background technique [0002] In a multicast scenario, multiple users obtain the same service data in the same frequency band. Since the channel conditions of each user are different, the multicast rate is often limited by the user with the worst channel condition. Contents of the invention [0003] The purpose of the present invention is to overcome the problem that the existing multicast system is limited to the user with the worst link; propose a cooperative multicast method based on fountain codes, under the premise of ensuring that all users receive multicast data reliably , to further improve the capacity of the multicast system through cooperation. [0004] The purpose of the present invention is achieved through the following technical solutions: [0005] A cooperative multicast method based on fountain codes, which is applied to a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/06H04L1/00H04L1/16
CPCH04L1/18H04L1/0077Y02B60/50H04L1/1854H04L2001/0093H04L12/189H04W4/06
Inventor 任品毅卢金城杜清河陈志刚王熠晨吴广恩刘婧
Owner XI AN JIAOTONG UNIV
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