Downlink self-adaptive transmission method in cellular relay network

A cellular relay network, adaptive transmission technology, applied in the field of mobile communication, can solve the problems of limited performance, poor capacity, poor performance of TH scheme, etc.

Inactive Publication Date: 2011-01-19
BEIHANG UNIV +1
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  • Abstract
  • Description
  • Claims
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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 commun...

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, its flow chart is 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 station and relay nodes in the cellular relay network, and at the same time, the relay nodes in the cellular relay network send uplink pilot signals to the base station. Channel reciprocity estimates the downlink channel information of BR and BU, the relay node estimates the downlink channel information of RU according to the channel reciprocity of the time division duplex system, and the relay node feeds back the channel information of 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, belonging to the technical field of mobile communication. Background technique [0002] With the development of communication services and the growth of people's needs, future wireless communication systems need to support high speed and large capacity. There are several problems in the current cellular communication system, and inter-cell interference (ICI for short) is one of the 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 for relay transmission between a base station and a user through a relay node using multi-hop communication. For the next generation wireless communication system working in the high frequency b...

Claims

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Application Information

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IPC IPC(8): H04W28/18H04B7/15
Inventor 田亚飞胡文丰杨晨阳易栗雷鸣
Owner BEIHANG UNIV
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