Interlayer transmission diversity system and interlayer transmission diversity method

Abstract

The invention discloses an interlayer transmission diversity system and an interlayer transmission diversity method. The method comprises the following steps: step S202: an interlayer transmission diversity control unit acquires a measured result of a wireless terminal for a second type wireless connection point; step S204: the interlayer transmission diversity control unit updates an interlayer transmission diversity active set according to the measured result reported by the wireless terminal; and step S206: the interlayer transmission diversity control unit determines a diversity mode of transmission data between a first type wireless connection point and the second type wireless connection point in the active set, and the first type wireless connection point and the second type wireless connection point in the active set send the information in a diversity manner. By the method, the system has higher spectral efficiency when providing services to the wireless terminal in a high speed moving state, which overcomes the disadvantage that the traditional wireless access networks have difficulty in improving the transmission rate of the terminal located in a fringe area of a cell.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a transmission diversity system and method between lower layers of a point-to-point communication service. Background technique [0002] In cellular mobile communication, the transmitted signal of the base station often reaches the receiving end of the mobile station after multiple reflections, scattering and refraction. This easily causes multipath fading of the signal. In a fading environment, multi-antenna diversity technology can effectively improve the performance of wireless communication systems. In 3G systems, multi-antenna transmit diversity is a very important key technology. Signals are transmitted through multiple antennas that are spaced far enough apart to achieve space diversity. The distance between the antennas is far enough to ensure that the fading suffered by the signal transmitted by each antenna after passing through the channel is irrelevant. WCDMA...

AI Technical Summary

Problems solved by technology

[0015] patent application "a structure and method for inter-layer coordinated co-frequency transmission" (application number is PCT / CN2006 / 001085, application date is 2006-5-2) The disadvantage is that only the interlayer transmit diversity method in the point-to-multipoint broadcast service is given, and the interlayer transmit diversity method in the point-to-point communication service is not given

The shortcoming of [0016] patent application "Hierarchical cell and configuration method of transmit diversity mode" (application number is 200610126031.7, application date is 2006.08.28) is: In point-to-point communication, different transmit diversity methods are used in different layers, and the implementation method of transmit diversity between layers in point-to-point communication is not given

In addition, in the proposed "hierarchical cells of the first level group use the open-loop transmit diversity mode, and the hierarchical cells belonging to the second level group use the closed-loop transmit diversity mode", all the diversity for high-speed mobile terminals is provided by "No. The disadvantage of the "one-level group" implementation is that the spectrum efficiency when the terminal receives signals from two transmit antennas that are far apart to achieve diversity is not as good as that of the terminal receiving a diversity spectrum between an antenna that is far apart and a antenna that is close to each other efficient

[0017] Patent No. US5,546,443 discloses the disadvantages of "a hierarchical wireless access system and working method": 1) only one macro cell and Diversity between one microcell does not consider diversity between one macrocell and multiple microcells; 2) Diversity between multiple microcells is not considered; 3) Diversity processing is performed on both control channels and traffic channels , when the distance between the micro cell antenna and the macro cell antenna is far away, for example, when the terminal is at the edge of the macro cell, it is difficult to achieve a good diversity effect and it is easy to cause large interference to the adjacent macro cell and the adjacent micro cell

[0018] Patent Application No. 02814129.6 "Hierarchical Cellular Radio Communication System" proposes that only a control subchannel is established between the terminal and the macro cell main station (base station), and the micro cell The method of establishing only data sub-channels between master stations (base stations), that is, the inventive idea of ​​using different cells to establish different sub-channels proposed in this patent, although theoretically can achieve the effect of reducing control overhead and reducing interference, However, in the actual system, when the terminal is at the edge of the macro cell, there will be the following disadvantages: in order to ensure the reliability of the control sub-channel, the terminal needs to send a strong control signal, which is easy to affect the adjacent macro cells and adjacent The small cell produces large interference

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