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Mobile communication system and downlink transmission power control method thereof

A mobile communication system and transmission power control technology, applied in the field of downlink transmission power control, can solve the problem of not considering TPC signal error decoding and the like

Inactive Publication Date: 2006-02-15
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not take into account the erroneous decoding of the TPC signal during soft handover

Method used

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  • Mobile communication system and downlink transmission power control method thereof
  • Mobile communication system and downlink transmission power control method thereof
  • Mobile communication system and downlink transmission power control method thereof

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Experimental program
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Embodiment Construction

[0034] refer to Figures 1 to 10 , a mobile communication system according to a preferred embodiment of the present invention will be described.

[0035] figure 1 It is a schematic diagram of a wideband code division multiple access (W-CDMA) wireless network system as a mobile communication system. exist figure 1 In this network system, the network system includes: a plurality of base stations (only two are shown) 11 and 12, a wireless network controller 13 connected to the base stations 11 and 12 through asynchronous transfer mode (ATM) lines, and a W-CDMA-based The wireless access system wirelessly connects at least one mobile terminal 14 connected to the base stations 11 and 12 .

[0036] Such as figure 2 As shown, the wireless network controller 13 has: a base station interface 21 for connecting with the base stations 11 and 12; a signal processing unit 22 for processing signals from the base stations 11 and 12; and a control unit 23 for controlling the entire wireles...

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Abstract

Base stations concerned with soft hand-over respecting a mobile terminal notify sums of control values to a wireless network controller at intervals of the predetermined number of frames. In each base station, the control values are obtained by decoding common transmission power control signals transmitted by the mobile terminal at intervals of time slot shorter than the frame. The mobile terminal notifies ratios of signal power to noise power regarding common pilot signals transmitted by the base stations. The wireless network controller selects one of the base stations as a reference station according to the ratios of signal power to noise power. The wireless network controller instructs the base stations to match transmission power of the base station(s) other than the reference station to that of the reference station.

Description

[0001] This application claims priority from the prior application JP 2004-233457, the disclosure of which is incorporated herein by reference. technical field [0002] The present invention relates to a mobile communication system, more specifically, to a downlink transmission power control method of a wideband code division multiple access (W-CDMA) mobile communication system. Background technique [0003] In a mobile communication system employing Code Division Multiple Access (CDMA), a plurality of base stations and a plurality of mobile terminals use a common frequency band. Therefore, transmit power control is required to suppress interference. [0004] A known transmission power control method employs a combination of an inner loop control for bringing a received SIR (Signal-to-Interference Ratio) close to a target SIR and an outer loop control for updating the target SIR according to reception quality. Such a transmission power control method is disclosed in Unexami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04B7/26H04J13/00H04W36/00H04W52/04H04W52/40
CPCH04W52/40H04W52/143
Inventor 印南贵春
Owner NEC CORP