Transmission power control method
First Claim
1. A method of transmission power control in a communication system having a mobile station transmitting to a base station, the communication system defining power steps of a mobile station as encompassing a specified range of power levels, comprising the steps of:
- selecting a particular power step of the mobile station;
dividing the particular power step into a plurality of power sub-steps having a higher power sub-step and a lower power sub-step;
assigning a unique nominal transmission power level, within the specified range of power levels encompassed by the particular power step, to each one of the plurality of power sub-steps;
obtaining, at the mobile station, a command from the base station instructing the mobile station to use a certain power step;
determining if the certain power step is also the particular power step;
if the certain power step is also the particular power step;
identifying whether a channel condition exceeds a predetermined threshold;
if the channel condition exceeds the predetermined threshold;
electing the higher power sub-step as said one of the plurality of power sub-steps; and
if the channel condition does not exceed the predetermined threshold;
electing the lower power sub-step as said one of the plurality of power sub-steps;
transmitting a signal from the mobile station, at the unique nominal transmission power level assigned to said one of the plurality of power sub-steps; and
if the certain power step is not also the particular power step;
transmitting a signal, from the mobile station, at a power level within the specified range of power levels encompassed by the certain power step.
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Accused Products
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 (290) instructs a mobile station (280) to use a defined power step, and the mobile station (280) initially selects a maximum power sub-step within the requested power step during an initial RACH (225) transmission. During the duration of the call, the mobile station (280) 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.
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Citations
16 Claims
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1. A method of transmission power control in a communication system having a mobile station transmitting to a base station, the communication system defining power steps of a mobile station as encompassing a specified range of power levels, comprising the steps of:
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selecting a particular power step of the mobile station; dividing the particular power step into a plurality of power sub-steps having a higher power sub-step and a lower power sub-step; assigning a unique nominal transmission power level, within the specified range of power levels encompassed by the particular power step, to each one of the plurality of power sub-steps; obtaining, at the mobile station, a command from the base station instructing the mobile station to use a certain power step; determining if the certain power step is also the particular power step; if the certain power step is also the particular power step; identifying whether a channel condition exceeds a predetermined threshold; if the channel condition exceeds the predetermined threshold; electing the higher power sub-step as said one of the plurality of power sub-steps; and if the channel condition does not exceed the predetermined threshold; electing the lower power sub-step as said one of the plurality of power sub-steps; transmitting a signal from the mobile station, at the unique nominal transmission power level assigned to said one of the plurality of power sub-steps; and if the certain power step is not also the particular power step; transmitting a signal, from the mobile station, at a power level within the specified range of power levels encompassed by the certain power step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of transmission power control in a communication system having a mobile station transmitting to a base station, the communication system defining power steps of a mobile station as encompassing a specified range of power levels, comprising the steps of:
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choosing a maximum power step of the mobile station as a particular power step of the mobile station; dividing the particular power step into a plurality of power sub-steps having a higher power sub-step and a lower power sub-step; assigning a unique nominal transmission power level, within the specified range of power levels encompassed by the particular power step, to each one of the plurality of power sub-steps; obtaining, at the mobile station, a command from the base station instructing the mobile station to use a certain power step; determining if the certain power step is also the particular power step; if the certain power step is also the particular power step; identifying whether a signal type of the command from the base station is a predetermined signal type; if the signal type is a predetermined signal type; electing the higher power sub-step as said one of the plurality of power sub-steps; and if the signal type is not a predetermined signal type; electing the lower power sub-step as said one of the plurality of power sub-steps; transmitting a signal, from the mobile station, at the unique nominal transmission power level assigned to said one of the plurality of power sub-steps; and if the certain power step is not also the particular power step; transmitting a signal, from the mobile station, at a power level within the specified range of power levels encompassed by the certain power step. - View Dependent Claims (15, 16)
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Specification