Multi-base-station cooperative communication method of time division-long term evolution (TD-LTE) spread spectrum orthogonal frequency division multiplexing (OFDM) system

A collaborative communication, multi-base station technology, applied in the field of multi-base station collaborative communication, can solve the problem of difficulty in improving the spectral efficiency of cell edge users

Active Publication Date: 2015-05-06
HARBIN INST OF TECH
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Problems solved by technology

[0003] The present invention is to solve the problem that the existing multi-base station cooperative communication method needs a large amount of feedback information, and the traditional OFDM-based cellular network system is difficult to improve the spectral efficiency of the cell edge users, thereby providing a TD-LTE spread spectrum OFDM system multi-base station cooperative communication method

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  • Multi-base-station cooperative communication method of time division-long term evolution (TD-LTE) spread spectrum orthogonal frequency division multiplexing (OFDM) system
  • Multi-base-station cooperative communication method of time division-long term evolution (TD-LTE) spread spectrum orthogonal frequency division multiplexing (OFDM) system
  • Multi-base-station cooperative communication method of time division-long term evolution (TD-LTE) spread spectrum orthogonal frequency division multiplexing (OFDM) system

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specific Embodiment approach 1

[0098] Specific implementation mode 1. Combination Figure 1 to Figure 11Describe this specific embodiment, the multi-base station coordinated communication method of TD-LTE spread spectrum OFDM system,

[0099] Uplink resource scheduling method:

[0100] For multiple user UEs (User Equipments) that need to send data in a cell, first, the cell base station in the cooperative network performs uplink resource scheduling, and allocates uplink resources and related modulation and coding schemes (MCS, Modulation and Coding) to users in the cell. and Coding Scheme). The uplink resource scheduling method is realized by the following steps:

[0101] For each user who needs to send data in the cell:

[0102] Step A1, the base station of the cell judges whether the user is located in the center of the cell or the edge of the cell according to the path loss corresponding to the user. If the user is located in the center of the cell, the traditional LTE uplink resource scheduling metho...

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Abstract

The invention relates to a multi-base-station cooperative communication method of a TD-LTE spread spectrum OFDM system and aims to solve the problems that a large number of feedback information is needed by the existing multi-base-station cooperative communication method and the existing cellular network system based on the OFDM is difficult to improve spectrum efficiencies of cell edge users. According to the method, in a cooperative network, each cell edge user communicates by using the spread spectrum OFDM mode and performs multiple access through code division, and the base station of each cell informs other cells of spreading codes used by the cell edge users, so that each cell can obtain the spreading codes used by the other cells in the cooperative network. Additionally, for edge user uplink spread spectrum signals received by the base stations, because all spreading codes used now are known, the base station can suppress multiple access interference by using an interference elimination mode to improve the spectrum efficiencies of the edge users. The method is suitable for multi-base-station cooperative communication of the OFDM system.

Description

technical field [0001] The invention relates to a multi-base station coordinated communication method of a spread spectrum OFDM system. Background technique [0002] The LTE (Long Term Evolution) communication system adopts a multiple access method based on OFDM (Orthogonal Frequency Division Multiplexing), so inter-cell interference becomes the main interference. The partial frequency reuse method adopted by the traditional LTE system (R8, Release 8 version), such as figure 1 As shown, different filling patterns represent different frequency resources. The entire frequency resource is divided into 4 parts, 1 part is used for cell center users, and the remaining 3 parts are used for cell edge users. Different cell center users use the same frequency resources, and adjacent cells use the same frequency resources. Use different frequency resources. Although the inter-cell interference can be reduced in this way, the frequency spectrum utilization rate is not high. The R10 (...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04L1/00H04L27/26H04W72/04H04W72/12
Inventor 沙学军吴宣利赵龙海李卓明白旭吴玮
Owner HARBIN INST OF TECH
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