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Method for controlling outer loop power of mobile terminal in code division multiple access mobile communication system

A technology for outer loop power control and mobile communication systems, applied in power management, wireless communication, transmission control/equalization, etc., can solve the problems of large adjustment range, affecting system capacity and stability, slow convergence speed, etc.

Active Publication Date: 2011-02-02
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In practical applications, there are big problems in this approach: slow convergence speed and large adjustment range
Therefore, these problems will directly affect the capacity and stability of the system

Method used

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  • Method for controlling outer loop power of mobile terminal in code division multiple access mobile communication system
  • Method for controlling outer loop power of mobile terminal in code division multiple access mobile communication system
  • Method for controlling outer loop power of mobile terminal in code division multiple access mobile communication system

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Embodiment Construction

[0088] In order to understand the technical content of the present invention more clearly, the following examples are given in detail.

[0089] At first the algorithm of the present invention is described in detail below:

[0090] There is a formula:

[0091] 0=(1-a)×a-a×(1-a) ......(1)

[0092] Formula (1) is multiplied by a time interval T, and then transformed into formula (2):

[0093] 0=((1-a)×T)-(a×T)(1-a) ......(2)

[0094] Assuming that the transport channel has only one transport block in each TTI, and a is equal to the BLERTarget of the transport channel, formula (2) is further rewritten to obtain formula (3):

[0095] X=(number of CRC pass)×a-(number of CRC failure)×(1-a) ......(3)

[0096] Then for some time interval T, X will be equal to 0. Assuming that the CRC is correct, lower the SIRTarget of the transmission channel by adB, then (number of CRC pass)×a represents the total reduction range of SIRTarget within a period of time; if the CRC is wrong, increase...

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Abstract

The invention relates to a method for controlling the outer loop power of a mobile terminal in a code division multiple access (CDMA) mobile communication system. The method comprises the following steps: recording the target error block rate distributed for each transmission channel of the mobile terminal by the system; according to the target error block rate of each transmission channel, setting initial target signal-to-noise ratio corresponding to the transmission channel; recording the decoding result of the mobile terminal on each transmission channel during the transmission time interval; according to the decoding result, adjusting the target signal-to-noise ratio of each transmission channel one by one; according to the target signal-to-noise ratio corresponding to each transmission channel of the mobile terminal, determining the target signal-to-noise ratio controlled by the inner loop power; and according to the determined target signal-to-noise ratio, setting the threshold controlled by the inner loop power. By adopting the method for controlling the outer loop power of the mobile terminal in the CDMA mobile communication system, the crosstalks between mobile terminals can be reduced, the large swinging of the transmission power of the base station can be avoided, the capacity and stability of the system can be increased, the system is easy and fast to operate, the working performance is stable and reliable, and the method has wide application range.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to the technical field of power control of a mobile communication system, and specifically refers to a method for realizing outer loop power control of a mobile terminal in a code division multiple access mobile communication system. Background technique [0002] In the third generation of mobile communication (The Third Generation, "3G" for short), the three mature standards all belong to the Code Division Multiple Access (CDMA) communication system. Since users in the same cell in the system all share the same frequency, the signal energy of each mobile terminal (User Equipment, "UE" for short) is allocated within the entire frequency band, and for each user terminal, other terminals are noise. Therefore, if the power is too high, it will cause stronger interference to other terminals and reduce the operation efficiency of the entire communication system, and if the power is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04W52/12
Inventor 许大山王璽政吴佰年
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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