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Method for descending power control in SCDMA system

A power and transmit power technology, applied in the field of downlink power control, can solve the problems of single, lack of wireless channel adaptability, unable to meet the power control needs of different business types, etc., to meet the needs of different business types, reasonable allocation and The effect of using

Inactive Publication Date: 2010-05-05
BEIJING XINWEI TELECOM TECH
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AI Technical Summary

Problems solved by technology

[0007] The existing SCDMA power control technology is relatively simple, and the same power control method is used for different service types, which cannot meet the power control needs of different service types
Existing SCDMA power control parameters are fixed and do not change with time, so they lack adaptability to wireless channels

Method used

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  • Method for descending power control in SCDMA system
  • Method for descending power control in SCDMA system
  • Method for descending power control in SCDMA system

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Embodiment Construction

[0029] 1. Downlink power balance processing of omnidirectional access code channel and directional service code channel

[0030] The SCDMA service code channel adopts advanced smart antenna technology for directional transmission; considering the random distribution of users in the cell, the access code channel adopts omnidirectional transmission. Therefore, under the same SF (spreading gain) and downlink transmission power, the directional service code channel will obtain a higher superposition gain than the omnidirectional access code channel, which will cause the difference between the omnidirectional access code channel and the directional service code channel. The downlink power is unbalanced. In order to avoid this situation, SCDMA restricts the downlink transmission power of the service code channel as follows:

[0031] power V ≤Power A -10·lg(M)+10·lg(SF A / SF V )

[0032] Among them Power V 、Power A , M, SF A , SF V Respectively represent the downlink transm...

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Abstract

This invention provides one method to control down power in SCDMA system, which adjusts as following powers: Power<=PowerA-10 .1g(M)+10 ..1g(SFA / SFV), wherein, Power,PowerA,M,SFA,SFV represents business code down emission power, interface code channel maximum emission power, antenna array number, interface code channel diffusion factors and business code channel expansion factor.

Description

technical field [0001] The invention relates to a method for controlling downlink power in a wireless communication system, in particular to a method for controlling downlink power in an SCDMA system. Background technique [0002] In SCDMA system, downlink power control is an important topic. [0003] First of all, for a user terminal, within a certain range, the higher the downlink power, the better the received signal quality, the higher the signal-to-noise ratio, the lower the bit error rate, and the stronger the anti-interference and anti-fading capabilities. Different services and different wireless channels have a minimum requirement for allocated power. But on the other hand, if the power allocated to one user is too high, it will cause unnecessary waste, saturation of the terminal receiver, and signal interference to other users in the cell and adjacent cells. [0004] Secondly, each user and various services under a base station share the downlink transmission pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/005
Inventor 丁勇李一鸣岳彦生
Owner BEIJING XINWEI TELECOM TECH
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