Method for determining down initial transmitting power

A technology of initial transmit power and time slot, which is applied in the field of communication systems, can solve problems such as UE quality deterioration, interference impact, and large path loss, and achieve the effect of improving coverage area, capacity, and performance

Active Publication Date: 2007-11-21
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007]The existing downlink initial power allocation method does not consider the downlink path loss and downlink time slot interference, so the allocated downlink initial transmit power is very inaccurate
If the UE is relatively close to the base station, the path loss is relatively small at this time, and the interference to the UE from the surrounding adjacent cells will be relatively small. If the downlink power allocated according to the current average is much greater than the appropriate initial downlink transmit power, it is Other UEs cause a large burst of interference impac

Method used

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  • Method for determining down initial transmitting power
  • Method for determining down initial transmitting power
  • Method for determining down initial transmitting power

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Embodiment Construction

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] The idea of ​​the present invention is to use the open-loop power control method to calculate the initial downlink transmission power, focusing on the initial channel establishment or handover process and channel reconfiguration process, according to the path loss and surrounding area of ​​the base station signal to the UE location The load of adjacent cells is used to estimate the interference of the target downlink time slot, so as to solve the problem that the UE downlink time slot interference information cannot be obtained in advance.

[0049] The formula for calculating the downlink initial transmit power according to the open-loop power control method is as follows:

[0050] P DL-TX =(SIR) target +L+I (1)

[0051] Where: (SIR) target In order to meet the target signal-to-noise ratio of business service quality...

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Abstract

The method comprises: considering the path losses and the time slot interference when calculating the downlink initial transmitted power in order to figure out the size of downlink initial transmitted power reasonably and to avoid the influence caused by oversized transmitted power or undersized transmitted power. During the process of just establishing the physical layer or re-allocating the channel or inter-cell switchover, even if there isn't the destination time slot interference measured value reported by UE, the invention can also figure out the downlink time slot interference, and use the downlink power control to calculate the downlink initial transmitted power so as either to ensure the success ratio of access and the Quos requirement or to avoid the heavy interference to other UEs.

Description

technical field [0001] The present invention relates to a communication system, in particular to a method for determining downlink initial transmission power. Background technique [0002] Code Division Multiple Access (CDMA) is a modulation and multiple access technology based on spread spectrum communication. In a CDMA communication system, since the base station and the mobile station use the same wireless frequency band, the base station will transmit signals to a certain mobile station. Cause interference to mobile stations in this cell and neighboring cells. Since the CDMA mobile communication system is a self-interference system with limited interference and has near-far characteristics, in order to maximize the system capacity and coverage and ensure the quality of service communication, the base station (Node B) needs to allocate reasonable downlink power. [0003] In Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system, according to the divisi...

Claims

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Application Information

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IPC IPC(8): H04B7/005H04Q7/32
Inventor 李楠赵瑾波
Owner DATANG MOBILE COMM EQUIP CO LTD
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