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Transmission power control method

A technology of transmitting power control and transmitting power level, applied in the field of radio frequency transmitters, can solve the problems of increasing the telephone conversation time, disconnecting the cell phone call, etc., to improve the call completion rate and save the battery.

Inactive Publication Date: 2003-04-23
GOOGLE TECH HLDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this lower power output increases the talk time of the phone, it can also cause cell phone calls to drop when a phone at a nominal 33dB power output would successfully communicate continuously

Method used

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  • Transmission power control method
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  • Transmission power control method

Examples

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Embodiment Construction

[0013] figure 1 A power control step diagram for class 4 GSM mobile stations is shown according to the preferred embodiment. Class 4 GSM mobile stations have a maximum transmission power of 2W under the GSM 900MHz system. Typically, class 4 GSM mobile stations are hand-held cellular telephones. For category 4 installations, 11 power steps are available. The maximum power step 5 has a nominal transmit power level of 33 ± 3dB. Thus, in GSM, defined power steps have ranges of overlapping power levels. Mobile stations can transmit at power levels as low as 30dB and as high as 36dB and still remain compliant with the GSM specification for power step 5.

[0014] In the preferred embodiment, the power step 5 is divided into two power substeps, each power substep having a separate nominal transmit power level. The largest power substep 5A 160 has a corresponding nominal transmit power level of 33 dB, while the lower power substep 5B 150 has a corresponding nominal transmit power ...

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Abstract

A transmission power control method subdivides one or more transmission power steps as defined in a system specification into multiple sub-steps. A base station instructs a mobile station to use a defined power step, and the mobile station initially selects a maximum power sub-step within the requested power step during an initial RACH transmission. During the duration of the call, the mobile station dynamically adjusts the power sub-step based on measured signal reception quality and channel conditions. The result is an improvement in call completion rates with only a minor reduction in battery life.

Description

technical field [0001] FIELD OF THE INVENTION The present invention relates generally to radio frequency (RF) transmitters and, more particularly, to methods of power control for radiotelephones. Background technique [0002] In certain cellular communication systems, a fixed base station controls the transmit power level of a mobile station. In communication systems such as Advanced Mobile Phone Service (AMPS), Time Division Multiple Access (TDMA) and Global System for Mobile Communications (GSM), the base station instructs the portable station to take one of several defined power steps at each moment in time. For example, the GSM specification defines 15 uplink power control steps, each separated by 2dB and each with a 3dB margin. [0003] A GSM base station broadcasts power step instructions on a broadcast control channel (BCCH) signal that is received by matching mobile stations in its coverage area before the mobile station makes any access attempts. Thus, when a port...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/005
CPCH04W52/50H04W52/367
Inventor 安图安·特兰代休·王韦恩·黄孙刚格雷戈里·R·布莱克詹姆斯·G·海勒
Owner GOOGLE TECH HLDG LLC