Downlink self-adaptive transmission method in cellular relay network

A technology of cellular relay network and self-adaptive transmission, applied in the field of mobile communication, can solve problems such as poor performance, poor capacity, and limited performance of TH solutions

Inactive Publication Date: 2012-12-19
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The implementation of the TH scheme is simple, but its performance is limited by the capacity of the poorer hop link. When any communication link of the BR or RU is subject to random deep fading or strong interference of the wireless channel, the performance of the TH scheme bad

Method used

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  • Downlink self-adaptive transmission method in cellular relay network
  • Downlink self-adaptive transmission method in cellular relay network
  • Downlink self-adaptive transmission method in cellular relay network

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Embodiment Construction

[0044] The downlink adaptive transmission method in the cellular relay network proposed by the present invention has a flow chart as follows Figure 4 shown, including the following steps:

[0045] (1) The base station in the cellular relay network obtains the channel information of the three downlinks, and the specific process is as follows:

[0046] Users in the cellular relay network send uplink pilot signals to the base stations and relay nodes in the cellular relay network, while the relay nodes in the cellular relay network send uplink pilot signals to the base stations. The channel reciprocity estimates the downlink channel information of the BR and BU, the relay node estimates the downlink channel information of the RU according to the channel reciprocity of the time division duplex system, and the relay node feeds back the channel information of the link RU to the base station through the feedback channel . For example, consider a time division duplex cellular relay...

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Abstract

The invention relates to a downlink self-adaptive transmission method in a cellular relay network, belonging to the technical field of mobile communication. The method comprises the following steps: a plurality of antennae are respectively arranged at a base station and a relay node of a cellular relay network; and the base station acquires the channel information of three down links, respectively estimates the message capacity of the cellular relay network in the three different signal transmission modes according to the channel information, provides two downlink cooperation transmission modes respectively based on the information quantity consolidation principle and the energy consolidation principle and compares them with the direct transmission mode, and finally, the base station selects an appropriate transmission mode after comprehensively considering the performance gain and resource expenses. The method improves the communication performance of cell-edge users, greatly explores the channel potential of the relay system three-node model and can obviously increase the spectrum efficiency of cell-edge users.

Description

technical field [0001] The invention relates to a downlink adaptive transmission method in a cellular relay network, and belongs to the technical field of mobile communication. Background technique [0002] With the development of communication services and the growth of people's needs, the future wireless communication system needs to support high speed and large capacity. There are several problems in the current cellular communication system, among which Inter-cell interference (Inter-cell interference, hereinafter referred to as ICI) is one of the more serious ones. In particular, users located at the edge of a cell are easily interfered by adjacent cells, so the performance of users at the edge of the cell is very poor, which becomes a bottleneck restricting the overall performance of the system. [0003] Relaying refers to a technology in which multi-hop communication is used for relay transmission between a base station and a user through a relay node. For the next ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/28H04W28/18H04B7/15
Inventor 田亚飞胡文丰杨晨阳易栗雷鸣
Owner BEIHANG UNIV
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