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Three-step distributed wireless cooperative multicast/broadcast method

A distributed, collaborative group technology, applied in broadcast service distribution, error prevention/detection using return channels, advanced technology, etc., to ensure fairness, high throughput, and small differences in throughput

Inactive Publication Date: 2010-11-24
PLA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The above patents mainly use relays to solve the problems of wireless coverage and cell edge handover, but these methods are highly dependent on the infrastructure and require specific relay nodes or special cooperative control devices. The method proposed in this paper mainly uses To solve the problem of distributed cooperative transmission, without increasing the network infrastructure, use the autonomous coordination among users to improve the throughput and fairness of the system and the effectiveness of cooperative transmission

Method used

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  • Three-step distributed wireless cooperative multicast/broadcast method
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Embodiment 1

[0057] Embodiment 1 (application under IEEE802.11 network architecture)

[0058] The present invention utilizes simultaneous cooperation of multiple users to obtain space diversity gain. Users can judge whether to participate in collaborative transmission by listening to the feedback information and calculating their respective collaborative contribution degrees. Multicast is implemented in three stages. The first stage is the multicast source multicast / broadcast data stage, the second stage is the user feedback stage, and the third stage is the user distributed collaborative transmission stage.

[0059] For the IEEE802.11 network architecture, there are 50 users in the system, and each round of multicast needs to broadcast data packets with a size of 1000 bytes at the basic rate R=2Mbps.

[0060] Specific steps are as follows:

[0061] Phase 1: Source Multicast / Broadcast Data Phase

[0062] Step 1: Initialize

[0063] a. Count the total number of multicast users, record i...

Embodiment 2

[0086] Embodiment 2 (application under IEEE802.16 network architecture)

[0087] The present invention utilizes simultaneous cooperation of multiple users to obtain space diversity gain. Users can judge whether to participate in cooperative transmission by listening to the feedback information and calculating their respective collaborative contribution degrees. Multicast is implemented in three phases. The first stage is the source multicast / broadcast data stage, the second stage is the user feedback stage, and the third stage is the user distributed cooperative transmission stage.

[0088] IEEE802.16 network architecture, a data frame is composed of downlink data subframe, uplink data subframe and guard band, it can be considered to divide the uplink subframe into a part of time slots for the second stage of feedback, and the feedback time is set according to user needs; The downlink subframe is divided into two parts for the transmission of multicast data. The former part ...

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Abstract

The invention discloses a three-step distributed wireless cooperative multicast / broadcast method, which is to acquire spatial diversity gain by using the synchronous cooperation among a plurality of users. In the method, multicast / broadcast is realized by three steps: a first step of source multicast / broadcast for setting time distribution and data rate for each step, a second step of user feedback for allowing a user to use intercepted feedback channel information to analyze the cooperative contribution reasonably, determine if to cooperate and distribute the transmission power, a third step of user distributed cooperative transmission for allowing a cooperated user to process cooperative data in all paths by using equal-gain combination or maximum ratio combination so as to improve receiving performance. The method improves the effectiveness of cooperative transmission, reduces power consumption and improves the throughput and fairness of multicast.

Description

technical field [0001] The invention relates to a transmission for multicast services, provides a distributed cooperative multicast / broadcast scheduling method based on cooperative communication, space diversity and power control technologies, and belongs to the technical field of wireless multicast / broadcast. Background technique [0002] Wireless multicast / broadcast technology is an efficient mechanism for one-to-many data transmission in a wireless environment. It provides a broad wireless platform for TV, radio, film and other application suppliers, and has attracted widespread attention. The multicast / broadcast mode is a point-to-multipoint data service, and a single data stream is received by multiple users, which is especially suitable for live broadcast services such as TV programs and live event broadcasts. At present, the mobile TV service in which users watch TV programs on mobile terminals is gradually becoming popular on a large scale. The multimedia multicast / ...

Claims

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Application Information

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IPC IPC(8): H04W4/06H04L1/16
CPCY02B60/50Y02D30/70
Inventor 徐友云宋留斌谢威张冬梅
Owner PLA UNIV OF SCI & TECH
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