Method for cooperative multicast among users based on energy efficiency

Abstract

The invention aims to reduce the energy consumption and improve the energy efficiency of a system through selection of cooperative relay users and the distribution of relay power under the condition that the throughput capacity of the system is ensured. The invention discloses a method for cooperative multicast among users based on the energy efficiency. The method comprises the following steps of: dividing the multicast process into two stages, and at the first stage, multicasting data to all the users at a high speed by a base station, ensuring that a part of the users with good channel conditions correctly decode the data, estimating channel state information between the remaining users with bad channel conditions and the users correctly decoding the data, finding a user who has the best channel condition and correctly decodes the data relative to each user with a bad channel condition, and using the user correctly decoding the data as a relay; and at the second stage, reasonably distributing the power of each relay by using the estimated channel state information between the relay users and the remaining users with the bad channel conditions, and multicasting data to the remaining users with the bad channel conditions by using selected relays.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, realizes reliable and effective transmission for multiple users with different channel qualities, reduces energy consumption of the system, and improves energy efficiency of the system. Background technique [0002] Multimedia Broadcast Multicast Service (MBMS) is a point-to-multipoint transmission service mode defined in the 3GPP R6 specification. It can realize network resource sharing without changing the network structure, and effectively improve the utilization rate of wireless resources. Users receiving the same service in a multicast network belong to the same multicast group. Since users in a multicast group are distributed in different locations in the cell and experience different large-scale fading and small-scale fading, the channel conditions of different users are very different. Large, the capacity of a multicast group is limited by the users with the worst channel c...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the system capacity of the multicast group is limited by users with the worst channel conditions, and the problem that although the traditional cooperative multicast can improve the system capacity, the system consumes a lot of energy as the number of users increases

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