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Relay-based cooperative multicast method

A collaborative multicast, base station technology, applied in broadcast service distribution, electrical components, wireless communication, etc., can solve problems such as channel resource waste

Inactive Publication Date: 2015-04-29
XI AN JIAOTONG UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a relay-based cooperative multicast method to solve the problem of wasting channel resources for users with better link conditions in order to ensure reliable transmission of users with poorer links in traditional wireless multicast technology, And compared with traditional multicast technology, higher throughput is obtained

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Embodiment Construction

[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation examples.

[0052] The core idea of ​​the present invention is: the multimedia data (video and image) to be sent at the sending end, use layered encoding method to generate base layer data and enhancement layer data, then the multicast process is divided into two stages: the first stage base station broadcasts basic According to whether the user can correctly decode the basic layer information, the users are divided into two groups. Those who can correctly decode are divided into G1 group users, and those who cannot correctly decode are divided into G2 group users; the second stage correctly decodes the basic layer data The relays in the base station participate in the cooperation to transmit the basic layer data for the G2 group users, and at the same time, the base station transmits the enhancement layer data for the G1 group users. ...

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Abstract

The invention provides a relay-based cooperative multicast method. The method comprises the following steps that: 1) base layer data and enhancement layer data are generated by using multimedia data by a hierarchical coding method; 2) a multicast process is divided into two stages, at the first stage, a base station broadcasts the base layer data, and a relay and a user try to decode; the relay which decodes correctly takes part in cooperation at the second stage; and the user who decodes correctly receives the enhancement layer data at the second stage; and 3) at the second stage, the base station broadcasts the enhancement layer data, and the relay which decodes correctly sends the base layer data out on the same signal channel simultaneously; and a G1 user is required to eliminate the interference from the relay when receiving the enhancement layer data at the second stage, and sending power of the base station at the second stage is controlled simultaneously to ensure that a G2 user can meet the lowest transmission rate requirement of a base layer. Compared with the conventional relay cooperation scheme, the relay-based cooperative multicast method is high in throughput.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a relay-based cooperative multicast method. Background technique [0002] With the popularity of multimedia wireless terminals, people's demand for wireless multimedia services has increased significantly. At the same time, the sharp increase in business demand has also increased the energy consumption of the information technology industry. Therefore, how to realize energy-saving and reliable transmission of multimedia in a wireless environment is an important research field for the next generation of wireless communication technology. Multiple users may need the same wireless multimedia service at the same time, such as live broadcast of football games, software update, weather forecast, etc. At this time, wireless multicast technology is used to transmit the same data for different users on the same channel. Compared with traditional wireless Unicast technology...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/06H04W72/04
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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