Method for real-time computing path loss in mobile communication system

A mobile communication system and path loss technology, applied in wireless communication, multiplexing communication, code division multiplexing system, etc., can solve problems such as multiple memory, base station occupation, long computing time, etc.

Inactive Publication Date: 2006-03-08
诺基亚西门子通信系统技术(北京)有限公司
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

However, there is a disadvantage of enlarging the data bits. The base station needs to occupy more memory when processing the data, and at the same time requires longer calculation time

Method used

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  • Method for real-time computing path loss in mobile communication system
  • Method for real-time computing path loss in mobile communication system
  • Method for real-time computing path loss in mobile communication system

Examples

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Embodiment Construction

[0029] An example of path loss calculation and correction in a TD-SCDMA mobile communication system is given below.

[0030] (1) When the base station obtains the transmission power P of the user equipment at the beginning TXP And measure the received power P of the base station RXP , according to P TXP and P RXP The value of determines an index N. The criterion for determining the index N is to make the current real path loss fall within the range of [-(N+96)dB, -NdB]. Then use the transmit power of the user equipment to calculate a path loss value relative to the base station:

[0031] X TXP ′ = X TXP / ( 10 ) N / 10 - - - ( 5 ...

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Abstract

Receiving signal transmitted by user device, base station determines an index N based on empirical value or test value of previous signals. Using the index N, the method carries out operation of amplification, attenuation or maintenance for signal transmitted by user device, calculates value of lose of amplified, attenuated or maintained signals for average route in multiple frames to make the value of lose for average route is located at range of data specified by system. Then, using the said value N restores actual lose value for route in use for power control. Later, the index N can be kept unchanged, or can be updated once every certain number of frames.

Description

(1) Technical field [0001] The present invention relates to a kind of method that is carried out power control by base station in mobile communication system; method of power control. (2) Background technology [0002] In the TD-SCDMA (Time Division Synchronous Code Division Multiple Access) mobile communication system, the path loss of the wireless channel is very important for the base station to evaluate the wireless environment and then perform signal switching. The path loss of the signal can be used [0003] The following formula to express: [0004] P pathloss =P RXP -P TXP (1.1) [0005] where P RXP is the received power of the base station, P TXP is the transmit power of the user equipment. The above-mentioned path loss can be expressed by the absolute value of power in dBm, or can be expressed by the relative value of power in dB. For example, in the current TD-SCDMA system specification, P TXP The range is [-50dBm, 33d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04J13/00H04W24/08H04W52/18
Inventor 肖磊黄浩学
Owner 诺基亚西门子通信系统技术(北京)有限公司
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