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Control method based on power of down doing guidance time slot

A technology of power control and closed-loop power control, applied in transmission control/equalization, power management, communication between multiple stations, etc. It can solve the problems of complex equipment and heavy tasks, and achieve system stability and open-loop power control. Simple, Accurate Effects

Inactive Publication Date: 2003-07-23
CHINA ACAD OF TELECOMM TECH
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AI Technical Summary

Problems solved by technology

Although the open-loop power control is simple, there will be large errors in using the P-CCPCH channel as the object to measure the transmission loss, which limits the application of the open-loop power control in the communication maintenance stage; while the closed-loop power control must rely on the outer loop power process
However, in the current CDMA standard (see 3GPP and 3GPP2 related third-generation mobile communication standards), the outer loop power control is completely placed in the base station manager, and a base station manager controls dozens or even hundreds of base stations; Within the control range of this base station manager, there are thousands of terminals communicating at the same time, all power control is controlled by this base station controller, the task is very heavy and the equipment is very complicated

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  • Control method based on power of down doing guidance time slot
  • Control method based on power of down doing guidance time slot
  • Control method based on power of down doing guidance time slot

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Embodiment Construction

[0017] In the open-loop control of random access of terminals in the present invention, since an obvious advantage of the TDD system is that the uplink and downlink use the same carrier frequency, the uplink and downlink radio wave propagation characteristics are completely equal at the same time. This feature enables the open-loop control of TDD systems to achieve very high accuracy. like figure 1 As shown, when the terminal accesses randomly, the terminal first searches for the downlink pilot time slot (DwPTS) of the adjacent base stations, these base stations may work with the same or different carrier frequencies (100), and measures the DwPTS of these adjacent base stations The received power level Pr is measured several times, and the average value (110) is taken, so that the measurement can be relatively accurate, and the error caused by fast fading can be overcome. Because each base station in the TD-SCDMA system works synchronously, the DwPTS of all base stations are ...

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Abstract

In random access state, terminals decide the transmit power in UpPTS in open loop mode, by using the broadcast information and the DwPTS power measured. In the communication maintenance stage, the base station informs the terminals what is the received power needed by the base station. The terminal calculates the power value in open loop mode by using the DwPTS power measured as the threshold andreference of the transmitting power in up channel. The invention utilizes the same transmission condition in up and down links of TDD duplex mode and exerts the advantages of the simple and accurate of the open loop power control as far as possible so as to raise the accuracy of the power measurement. That is to say the accuracy of the power control is raised.

Description

technical field [0001] The present invention relates to a power control method of a mobile communication system, in particular to a power control method based on a downlink pilot time slot in a mobile communication system, and belongs to the technical field of mobile communication. Background technique [0002] In the CDMA mobile communication system, power control is a traditional and important subject. In the third-generation mobile communication system, the method of open-loop control + closed-loop control + outer-loop control is used. Methods for open-loop power control are described in TS 25.331 in the published 3GPP specifications (version March 2002, Release 99 and Release 4), methods for closed-loop power control are described in TS 25.214 and TS 25.224, and in addition TS 25.331 And the TS 25.433 specification also provides support for the outer loop power control mechanism. Taking the low chip rate TDD standard in 3GPP as an example, the three basic methods of po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/713H04B7/005H04J13/00H04W52/04H04W52/08H04W52/10H04W52/50
CPCH04W52/243H04W52/241H04W52/245H04W52/50H04W52/20H04W52/06H04W52/08H04W52/10H04W52/14
Inventor 李世鹤杨贵亮
Owner CHINA ACAD OF TELECOMM TECH
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