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Closed loop power control in radio communication system

A technology of radio communication and power control, applied in the field of auxiliary station, can solve the problem of inability to complete step-level difference tracking and so on

Inactive Publication Date: 2005-01-05
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the MS does not have the capability to achieve this minimum step-level difference, it will not be able to complete the step-level difference tracking required by the BS

Method used

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  • Closed loop power control in radio communication system
  • Closed loop power control in radio communication system
  • Closed loop power control in radio communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Detailed Description of Preferred Embodiments

[0016] Referring to FIG. 1, a radio communication system capable of operating in frequency division duplex or time division duplex mode includes a primary station (BS) 100 and a plurality of secondary stations (MS) 110. The BS100 includes: a microcontroller (μc) 102; a transceiver (Tx / Rx) 104 connected to a radio transmitting antenna 106; a power control device (PC) 107 for changing the power level of transmission; and to connect to the connection device 108 on the PSTN or other suitable network. Each MS 110 includes: a microcontroller (μc) 112; a transceiver (Tx / Rx) 114 connected to a radio transmitting antenna 116; and a power control device (PC) 118 for changing the power level of transmission . Communication from BS 100 to MS 110 occurs on downlink channel 122 and communication from MS 110 to BS 100 occurs on uplink channel 124 .

[0017] In a UMTS FDD system, data is transmitted in frames of 10 ms, with 15 time slo...

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Abstract

In a radio communication system having a primary station and a plurality of secondary stations, the power of uplink and downlink channels between the primary station and a secondary station is controlled in a closed loop manner by each station transmitting power control commands to the other station. In response to these commands the receiving station adjusts its output power in steps. By combining a plurality of received power control commands before adjusting its output power the receiving station may emulate the ability to use a smaller power control step size than its minimum, thereby improving performance under certain channel conditions. In one embodiment when the required power control step size is less than the minimum step size of a particular station, that station processes a group of power control commands to determine whether to adjust its output power by its minimum step size. In an alternative embodiment the power control step size is fixed when the combining algorithm is used. The invention is applicable to power control in both primary and secondary stations.

Description

technical field [0001] The present invention relates to a radio communication system, and further to an auxiliary station for use in such a system and a method of operating such a system. Although this technical specification describes a system with specific reference to the emerging Universal Mobile Telecommunications System (UMTS), it should be understood that such technology is equally suitable for application in other mobile radio systems. Background technique [0002] In a radio communication system, two basic types of communication are required between a base station (BS) and a mobile station (MS). The first is user traffic, such as voice or packet data. The second is control information, which needs to be used to set and monitor various parameters of the transmission channel so that BS and MS can exchange required user traffic. [0003] One of the functions of the control information in many communication systems is to enable power control. Power control of signals...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/005H04B7/26H04J13/00
CPCH04W52/362H04W52/42H04W52/221H04W52/60
Inventor T·J·莫斯利B·亨特M·P·J·贝克
Owner KONINKLIJKE PHILIPS ELECTRONICS NV