Power control method of end-to-end direct communication of NB TDD CDMA mobile communication system

A mobile communication system and power control technology, applied in transmission control/equalization, power management, wireless communication, etc., can solve the problem of not being able to grasp the end-to-end channel and communication status, achieve simple and easy implementation, and improve system capacity , the effect of small impact on system performance

Inactive Publication Date: 2004-08-18
BEIJING SAMSUNG TELECOM R&D CENT +1
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Problems solved by technology

In this way, since the network side cannot grasp the channel and communication status of the end-to-end direct communication, the power control commands of

Method used

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  • Power control method of end-to-end direct communication of NB TDD CDMA mobile communication system
  • Power control method of end-to-end direct communication of NB TDD CDMA mobile communication system
  • Power control method of end-to-end direct communication of NB TDD CDMA mobile communication system

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Embodiment Construction

[0014] Since terminals communicate directly with each other instead of through the base station, in the power control mode of end-to-end direct communication, the role played by the network side in the normal communication power control mode will be replaced by the corresponding terminal. In addition, due to the characteristics of end-to-end direct communication, the channel environment between the two terminals is generally better than that of normal communication, so the step size of power control between them should be less than 1dB; even in a certain way, there is no power control It is also fully possible to maintain end-to-end direct communication. Since the role played by the network side in communication is replaced by the terminal in the end-to-end direct communication, the corresponding power control function will also be moved from the network side to the terminal, and the specific implementation scheme will vary due to the difference in location. different.

[001...

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Abstract

An end-to-end direct communication power control method for NB TDD CDMA mobile communication system comprising the steps of, the power control mode in the end-to-end direct communication being achieved by the two terminals of the direct communication, the uplink and downlink closed-loop proceeded in the normal communication terminal and network side controlling the parameters needed by the uplink open-loop power control, which exert influences on the channels between the two terminals. The invention reduces the disturbance for the residential area, improves the system capacity, and extends the time of usage for the terminal battery, the minimum influence to the system performance is also realized.

Description

technical field [0001] The invention relates to a power control method for end-to-end direct communication in an NB TDD (narrowband time division duplex) CDMA mobile communication system. Background technique [0002] End-to-end direct communication is a new communication method in mobile communication system. End-to-end direct communication occurs in places where the base station cannot cover, or when two mobile terminals are very close to each other; The communication mode of the mobile terminal service no longer exists, and instead, the service flow is directly transmitted between the two terminals. In this way, since the network side cannot grasp the channel and communication status of the end-to-end direct communication, the power control commands of the end-to-end direct communication can only be generated at the terminal and passed to the other party for control during the direct communication. In the narrowband TDD CDMA system, uplink and downlink power control inc...

Claims

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Application Information

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IPC IPC(8): H04W52/08H04B7/005H04B7/26H04W52/14H04W52/24H04W52/56H04W52/58
Inventor 张淑伟李小强阎桂霞杜高科金正坤李周镐崔成豪李玄又
Owner BEIJING SAMSUNG TELECOM R&D CENT
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