Power control method base on set tactic

A technology of power control and group policy, applied in the direction of transmission control/equalization, transmission system, multi-carrier system, etc., can solve the problems of increasing system overhead and increasing interference, reducing system overhead, improving utilization, and achieving obvious effects. Effect

Inactive Publication Date: 2009-01-21
TONGJI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0004] 1. When the mobile terminal is in a high-speed motion state, the inter-carrier interference increases correspondingly due to the increase in speed;
[0005] 2. In the same cell, the power control of multiple users with similar channel conditions and the same adjustment value must be completed independently, which directly increases the system overhead

Method used

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  • Power control method base on set tactic
  • Power control method base on set tactic
  • Power control method base on set tactic

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0019] Group Policy Control Methods

[0020] In the Wimax system, the power control step size specified in the protocol is 0.5dBm, and the user-based adjustment value is a multiple of 0.5dBm. When there are many users in the cell, many users must have the same adjustment value within one frame. According to this feature, the present invention designs a group control message GP_MESSAGE based on the idea of ​​grouping, forms the same group of users with the same power adjustment value, inserts them into the GP_MESSAGE message, and then completes all group members’ information by sending this message. Power Control. The message format of GP_MESSAGE is as follows figure 1 As shown, refer to the 802.16 protocol message definition format, which fully meets the Wimax requirements. figure 2 with image 3 The sequence diagram and flow chart of the ...

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Abstract

The present invention discloses a power control method based on the group strategy, and belongs to the technical field of broadband wireless communication. With the control method of group strategy and the power adjustment algorithm based on the Doppler compensation, the base station judges the moving velocity, position information and operating state according to the signal intensity of the user terminal, and then inserts the users with the same adjusted value of power into one group, according to the calculation of the channel state and the adjusted power of Doppler compensation. When the uplink sub-frame is completed, the information of each group is respectively written into the management information; then the user terminals are informed through centralized broadcast so as to realize the power control. The power control method can effectively reduce the operating expense of communication system, in particular on such occasions as the high-speed train or underground railway of higher operating speed, more carrying users and higher traffic intensity and in the environment requiring more frequent power control. The effects of the power control method are more obvious, and the whole performance of the system is greatly improved.

Description

technical field [0001] The invention relates to a group policy-based power control method, belongs to the technical field of broadband wireless communication, is mainly applicable to OFDM systems, and is especially suitable for power control in a multi-cell multi-user environment in a high-speed mobile environment. Background technique [0002] With the continuous development of wireless communication technology, people spend more and more time using mobile communication. In the energy-constrained communication environment, how to save the battery of the mobile terminal and improve its battery life has been paid attention to and researched by people. As a widely used method, power control can not only reduce the transmit power of the mobile terminal, but also reduce the mutual interference between system users by reducing the power, and improve the overall performance of the system. [0003] When the cell radius becomes smaller and the number of users increases, the process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04B7/01H04B7/015H04L27/38
CPCY02D30/70
Inventor 刘富强徐尚志王新红钱业青王平李志鹏单联海刘凯杜珊高智伟姚义磊张祎琳
Owner TONGJI UNIV
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