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Self-adaptive switching method of multi-cell cooperative downward transmission modes

A technology of adaptive handover and multi-cell cooperation, applied in diversity/multi-antenna systems, spatial transmit diversity and other directions, which can solve the problems that the base station is difficult to obtain channel state information, wireless channel frequency offset, etc.

Active Publication Date: 2011-06-15
SOUTHEAST UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Due to the time-varying nature of the wireless channel, the delay of channel estimation and feedback, and the offset of frequency, it is difficult to obtain complete channel state information at the base station

Method used

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  • Self-adaptive switching method of multi-cell cooperative downward transmission modes
  • Self-adaptive switching method of multi-cell cooperative downward transmission modes
  • Self-adaptive switching method of multi-cell cooperative downward transmission modes

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The method for switching the multi-cell coordinated downlink transmission mode provided by the embodiment of the present invention can determine different transmission modes according to different channel state information and user locations: a cooperative transmission mode and a non-cooperative transmission mode. While reducing the information interaction overhead between base stations, the throughput of the cell edge is improved to meet the requirement of high spectrum utilization. The structure of cell serving base station and candidate serving base station is as follows: figure 1 shown.

[0036] Such as image 3As shown, a flow chart of a multi-cell coordinated downlink transmission mode switching method provided by an embodiment of th...

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Abstract

The invention discloses a self-adaptive switching method of transmission modes by channel statistics status information in a multi-cell cooperative downward system. The switching method comprises the steps: 1) a user confirms a cell service base station by receiving a signal to noise ratio, computes a candidate cooperative factor from the user to the other base stations in a cooperative cell cluster, and confirms the candidate cooperative base station in the cooperative cell cluster; 2) the user estimates channel information from the user to the cell service base station and from the user to the candidate cooperative base station, computes the channel statistics status information, transmits and receives a correlation matrix, and feeds the correlation matrix back to or implicitly feeds the correlation matrix back to each base station, and each base station transmits the channel status information to a central processing unit; and 3) the central processing unit computes a transmission type switching threshold according to the channel status information, and switches between the base station cooperative transmission mode and the base station non-cooperative transmission mode by comparing the receiving signal to noise ratios with the transmission type switching thresholds between the user and the cell service base station.

Description

technical field [0001] The present invention relates to the field of 3GPP LTE (Long Term Evolution of the Third Generation Partnership Project) standardization process, in particular to a method for adaptively switching multi-cell cooperative downlink transmission modes based on channel statistical state information. Background technique [0002] The Coordinated Multi Point (CoMP) technology reduces cell edge interference, improves cell edge throughput, and increases effective coverage through mutual cooperation between base stations to meet the requirements of high spectrum utilization. [0003] In the process of coordinated multi-point transmission, each cooperative base station needs to pass the channel information fed back by the user to the central processing unit, and the central processing unit realizes the scheduling and precoding of the user, and then transmits the scheduling and precoding results to the cooperative base stations . As the number of cooperative base...

Claims

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Application Information

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IPC IPC(8): H04B7/08H04B7/06
Inventor 金石张军高西奇
Owner SOUTHEAST UNIV
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