IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0275539
(2011-10-18)
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등록번호 |
US-8351975
(2013-01-08)
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우선권정보 |
GB-129098.0 (2001-12-05) |
발명자
/ 주소 |
- Anderson, Nicholas William
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출원인 / 주소 |
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대리인 / 주소 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
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인용정보 |
피인용 횟수 :
2 인용 특허 :
11 |
초록
▼
A method for setting a power control level (600) in a wireless communication system. The method includes the steps of obtaining (620) transmission information from a wireless subscriber unit, and modifying a power control level and/or a communication channel format (660) in response to said transmis
A method for setting a power control level (600) in a wireless communication system. The method includes the steps of obtaining (620) transmission information from a wireless subscriber unit, and modifying a power control level and/or a communication channel format (660) in response to said transmission information. Preferably, the transmission information is re-transmission requests from a wireless subscriber unit, which are transmitted frequently. In this manner, rapid adjustment of power control can be attained utilizing an optimal selection of the available communication channel format, followed by a fine-tuning power control operation.
대표청구항
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1. A method for downlink transmission in a wireless communication system, the method comprising, at a base station: obtaining transmission status information, with respect to downlink transmissions, from a wireless subscriber unit, wherein the transmission status information indicates at least one o
1. A method for downlink transmission in a wireless communication system, the method comprising, at a base station: obtaining transmission status information, with respect to downlink transmissions, from a wireless subscriber unit, wherein the transmission status information indicates at least one of received signal power of a downlink beacon channel and error performance on the downlink transmissions;determining a block error rate of the downlink transmissions based on the transmission status information;selecting a transport format to be used in a downlink transmission based at least in part on the indicated received signal power of the downlink beacon channel and the block error rate;modifying a downlink transmit power level of the downlink transmission or adapting a transmission data rate, based at least in part on the selected transport format; andperiodically obtaining updated transmission status information indicating at least one of received signal power of the downlink beacon channel and error performance on the downlink transmissions, wherein a period of obtaining the updated transmission status information is controlled by the base station. 2. The method of claim 1 further comprising calculating the transmission status information from at least one status report of downlink transmissions received from the wireless subscriber unit. 3. The method according to claim 1, wherein the wireless communication system uses downlink shared channels. 4. The method according to claim 1, wherein the transmission status information includes re-transmission requests from the wireless subscriber unit. 5. The method according to claim 1, wherein the transmission status information includes one or more of the following: an error performance indication of a downlink communication link;a downlink pathloss measurement report; anda downlink interference measurement report. 6. The method according to claim 5, wherein the transmission status information includes a downlink pathloss measurement report signaled from the wireless subscriber unit to the base station. 7. The method according to claim 5, wherein the wireless communication system supports a transmission between the base station and the wireless subscriber unit, and wherein the transmission status information includes a downlink pathloss measurement report signaled from the wireless subscriber unit to the base station. 8. The method of claim 1, further comprising operating a downlink transmission at a maximum power control level before modifying the downlink transmit power level based at least in part on the selected transport format. 9. The method according to claim 1, wherein obtaining the transmission status information includes one or more of: receiving the transmission status information from the wireless subscriber unit as part of an uplink message that the wireless subscriber unit has determined to transmit; andrequesting a measurement report from the wireless subscriber unit, and receiving measurement report data in response to the request. 10. The method according to claim 1, wherein periodically obtaining updated transmission status information comprises: iteratively obtaining further transmission status information from the wireless subscriber unit;determining a period of time between iterations; andinitiating a request for receiving transmission status information in response to the period of time exceeding a time threshold. 11. The method of claim 10, further comprising enabling and disabling initiating of the request for receiving transmission status information. 12. The method of claim 1, wherein obtaining the transmission status information further comprises one or more of: obtaining transmission status information from the wireless subscriber unit when the wireless subscriber unit determines to transmit an uplink message; andrequesting measurement report data from the wireless subscriber unit if optimization of downlink transmission power is currently active. 13. The method according to claim 12, further comprising activating the optimization of downlink transmission power when a number of data packets to be transmitted on a downlink channel exceeds a packet threshold amount. 14. The method according to claim 12, further comprising activating the optimization of downlink transmission power when a predetermined quantity of transmission status information has been received. 15. The method according to claim 1, further comprising switching off power control based on at least one of the following: an amount of buffered down link data being less than or equal to a threshold value; andwhether an elapsed time since reception of the transmission status information has exceeded a time threshold value. 16. The method according to claim 1, further comprising selecting the transport format with a smallest positive attenuation of a downlink transmission. 17. The method according to claim 1, further comprising allocating uplink transmission resources to carry the transmission status information from the wireless subscriber unit to the base station if an amount of buffered downlink data exceeds a time threshold value. 18. The method according to claim 17, further comprising releasing the uplink transmission resources and terminating the selection of the transport format, and the modification of the downlink transmit power level if the buffered downlink data is less than or equal to the threshold value. 19. A computer-readable medium comprising program code for a wireless downlink data transmission, the program code for, at a base station: obtaining transmission status information, with respect to downlink transmissions, from a wireless subscriber unit, wherein the transmission status information indicates at least one of received signal power of a downlink beacon channel and error performance on the downlink transmissions;determining a block error rate of the downlink transmissions based on the transmission status informationselecting a transport format to be used in a downlink transmission based at least in part on the indicated received signal power of the downlink beacon channel and the block error rate;modifying a downlink transmit power level of the downlink transmission or adapting a transmission data rate, based at least in part on the selected transport format; andperiodically obtaining updated transmission status information indicating at least one of received signal power of the downlink beacon channel and error performance on the downlink transmissions, wherein a period of obtaining the updated transmission status information is controlled by the base station. 20. The computer-readable medium of claim 19, further comprising program code for switching off power control and transport format selection based on at least one of the following: an amount of buffered downlink data to be transmitted to the wireless subscriber unit; andwhether an elapsed time since reception of the measurement reports has exceeded a time threshold value. 21. The computer-readable medium of claim 19, further comprising program code for allocating uplink transmission resources to carry a measurement report from the wireless subscriber unit to the base station if an amount of buffered downlink data exceeds a threshold value. 22. The computer-readable medium of claim 21, further comprising program code for releasing the uplink transmission resources and not modifying the power level and selecting the transport format, if the amount of buffered downlink data to be transmitted to the wireless subscriber unit does not warrant power and rate controlled downlink transmissions. 23. A base station for a wireless communication system, the base station comprising: a receiver configured to obtain transmission status information, with respect to downlink transmissions, from a wireless subscriber unit, wherein the transmission status information indicates at least one of received signal power of a downlink beacon channel and error performance on the downlink transmissions; anda processor configured to determine a block error rate of the downlink transmissions based on the transmission status information and to select a transport format to be used in a downlink transmission based at least in part on the indicated received signal power of the downlink beacon channel and the block error rate and to modify a downlink transmit power level of the downlink transmission or adapt a transmission data rate, based at least in part on the selected transport format,wherein the receiver is operable to periodically obtain updated transmission status information indicating at least one of received signal power of the downlink beacon channel and error performance on the downlink transmissions, wherein a period of obtaining the updated transmission status information is controlled by the processor. 24. A radio network controller for a wireless communication system, the radio network controller comprising: a receiver configured to obtain transmission status information, with respect to downlink transmissions, from a wireless subscriber unit, wherein the transmission status information indicates at least one of received signal power of a downlink beacon channel and error performance on the downlink transmissions; anda processor configured to determine a block error rate of the downlink transmissions based on the transmission status information and to select a transport format to be used in a downlink transmission based at least in part on the indicated received signal power of the downlink beacon channel and the block error rate and to modify a downlink transmit power level of the downlink transmission or adapt a transmission data rate, based at least in part on the selected transport format,wherein the receiver is operable to periodically obtain updated transmission status information indicating at least one of received signal power of the downlink beacon channel and error performance on the downlink transmissions, wherein a period of obtaining the updated transmission status information is controlled by the processor. 25. A wireless subscriber unit for a wireless communication system, the wireless subscriber unit comprising: a transmitter configured to transmit transmission status information, with respect to downlink transmissions, to a base station, wherein the transmission status information indicates at least one of received signal power of a downlink beacon channel and error performance on the downlink transmissions; anda receiver configured to receive a transmission from the base station at a downlink transmit power level and using a selected transport format, wherein a transport format for the downlink transmission is selected based at least in part on an indicated received signal power of the downlink beacon channel and a block error rate determined by the base station based on the error performance on the downlink transmissions,wherein the transmitter is further configured to periodically transmit updated transmission status information indicating at least one of received signal power of the downlink beacon channel and error performance on the downlink transmissions, wherein a period of transmitting the updated transmission status information is controlled by the base station. 26. A method for receiving a downlink transmission, the method comprising, at a wireless subscriber unit: transmitting transmission status information, with respect to downlink transmissions, to a base station, wherein the transmission status information indicates at least one of received signal power of a downlink beacon channel and error performance on the downlink transmissions; andreceiving a transmission from the base station at a downlink transmit power level and using a selected transport format, wherein a transport format for the downlink transmission is selected based at least in part on an indicated received signal power of the downlink beacon channel and a block error rate determined by the base station based on the error performance on the downlink transmissions,wherein the transmitting further includes periodically transmitting updated transmission status information indicating at least one of received signal power of the downlink beacon channel and error performance on the downlink transmissions wherein a period of transmitting the updated transmission status information is controlled by the base station. 27. A computer-readable medium comprising program code for receiving a downlink transmission, the program code for, at a wireless subscriber unit: transmitting transmission status information, with respect to downlink transmissions, to a base station, wherein the transmission status information indicates at least one of received signal power of a downlink beacon channel and error performance on the downlink transmissions; andreceiving a transmission from the base station at a downlink transmit power level and using a selected transport format, wherein a transport format for the downlink transmission is selected based at least in part an indicated received signal power of the downlink beacon channel and a block error rate determined by the base station based on the error performance on the downlink transmissions,wherein the transmitting further includes periodically transmitting updated transmission status information indicating at least one of received signal power of the downlink beacon channel and error performance on the downlink transmissions wherein a period of transmitting the updated transmission status information is controlled by the base station.
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