Power control and quality of service (QoS) implementation in a communication system

• US 8,488,459 B2
• Filed: 02/07/2006
• Issued: 07/16/2013
• Est. Priority Date: 03/04/2005
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Mese, Murat, Sutivong, Arak
• Primary Examiner(s): Hailu, Kibrom T
• Assistant Examiner(s): Beyen, Zewdu A
• Application Number:
  US11/349,611
• Publication Number:
  US 20060215559A1
• Time in Patent Office: 2,716 Days
• Field of Search: 455/500, 455/522, 455/69, 455/103, 455/127.1, 370/232, 370/395.21, 370/329
• US Class Current: 370/232
• CPC Class Codes: H04W 52/265 taking into account the quality of service QoS

Abstract

For Quality of Service (QoS) implementation in a multiple-access communication system, a base station processes data transmissions from terminals for all QoS classes supported by the system and obtains status information for the data transmissions. The status information may indicate whether each packet is decoded correctly or in error and the delay for each packet. For each QoS class, the base station derives one or more metrics based on the status information for data transmissions from disadvantaged terminals and updates the QoS parameter based on the metrics and requirements for the QoS class. The QoS parameter for each QoS class determines the transmit powers for the data transmissions sent for that QoS class. The base station broadcasts the QoS parameters for all QoS classes. Each terminal uses the QoS parameter for an applicable QoS class for power control of the data transmission sent to the base station.

Claims

1. An apparatus for power control for QoS classes in a wireless communication system, comprising:

a controller operative to identify, for each of at least two terminals given as belonging to a QoS class among a given plurality of Quality of Service (QoS) classes, whether the terminal is a disadvantaged terminal or a not disadvantaged terminal based on an estimated channel gain of the at least two terminals; and

a processor operative to process data transmissions received from one or both of the at least two terminals given as belonging to said QoS class for at least one of the Quality of Service (QoS) classes and to obtain, for each of at least two of the data transmissions, a status information indicating a received quality of the data transmission,

wherein the controller is further operative to conditionally update a QoS parameter corresponding to said QoS class, conditional in part on the status information and on whether the received and processed data transmission for which the status information is obtained is from a terminal identified as a disadvantaged terminal, wherein

if said received and processed data transmission is from a terminal identified as a disadvantaged terminal, to update said QoS parameter for the said QoS class based, at least in part, on the obtained status information and at least one given requirement for said QoS class, and to send the updated QoS parameter to at least two of the terminals given as belonging to the said QoS class, wherein at least one of said at least two is identified as disadvantaged terminal and at least one of said at least two is identified as a not disadvantaged terminal, and

if said received and processed data transmission is from a terminal not identified as a disadvantaged terminal, to not update said QoS parameter based on the status information obtained for the data transmission.

2. The apparatus of claim 1, wherein the processor is further operative to receive, as at least one of the data transmissions, a data transmission having packets, and to obtain said status information based on a quality of the packets received, and wherein the controller is further operative to derive at least one QoS metric based on the status information of the packets and to include, in updating the first QoS, updating said QoS parameter based on the at least one QoS metric and the at least one requirement for said QoS class.

3. The apparatus of claim 1, wherein the processor is further operative to receive, as at least one of the data transmissions, a data transmission having packets, and to obtain said status information based on a quality of the packets received, and wherein the controller is operative to determine, based on said status information, an error event rate for the data transmission and to include, in updating said QoS parameter, updating said QoS parameter based on the error event rate and an error event limit for said QoS class.

4. The apparatus of claim 3, wherein the processor is further operative to obtain said status information to indicate a packet decoded in error and to indicate a packet being received after a predetermined maximum delay, and wherein the controller is further operative to consider the status information indicating a packet decoded in error as an error event and to consider the status information indicating a packet received after the predetermined maximum delay as an error event.

5. The apparatus of claim 1, further comprising:

a channel estimator operative to estimate a channel gain for each of the at least two terminals, and wherein the controller is further operative to identify whether each of the at least two terminals is a disadvantaged terminal or a not disadvantage terminal based on the estimated channel gains.

6. The apparatus of claim 1, wherein said QoS class is a first QoS class and said QoS parameter is a first QoS parameter, and wherein the controller is further operative to identify, for each of at least two terminals given as belonging to a second QoS class among a given plurality of QoS classes, whether the terminal is a disadvantaged terminal or a not disadvantaged terminal,

wherein the processor is further operative to process data transmissions received from one or both of the at least two terminals given as belonging to the second QoS class to obtain, for each of said at least two of the data transmissions, a status information indicating a received quality of said data transmission,

wherein the controller is further operative to conditionally update, in response to at least one of said status information, a second QoS parameter for the second QoS class among the given plurality of the QoS classes conditional in part on said status information and on whether the received and processed data transmission for which said status information is obtained is from a terminal identified as a disadvantaged terminal, and based at least in part on said status information and at least one given requirement for the second QoS class.

7. The apparatus of claim 6, wherein the first and second QoS classes correspond, respectively, to a first set and a second set of ports.

8. The apparatus of claim 1, wherein said QoS parameter is one selected from the group consisting of:

a minimum transmit power, a maximum transmit power, and both minimum and maximum transmit powers for each of the at least two of the terminals to use for a subsequent data transmission.

9. The apparatus of claim 1, wherein the QoS parameter is a target signal-to-noise-and-interference ratio (SNR) for the data transmissions received from one or both of the at least two terminals given as belonging to said QoS class.

10. The apparatus of claim 1, wherein the QoS parameter is a transmission parameter to be met by data transmissions received from one or both of the at least two terminals given as belonging to the said QoS class.

11. The apparatus of claim 1, further comprising a channel estimator to estimate a channel gain for at least the two terminals given as belonging to said QoS class, and wherein the controller is further operative to identify whether each of the two terminals is a disadvantaged terminal based on a comparison of the estimated channel gains against a given gain threshold.

12. The apparatus of claim 11, wherein the controller is further operative to identify, based on the comparison of the estimated channel gains against a given gain threshold, a given quantity of disadvantaged terminals belonging to said QoS class, and to detect error events in the data transmissions received from the given quantity of disadvantaged terminals, and is further configured to use the detected error events meeting a given statistical averaging of error events to update said QoS parameter.

13. The apparatus of claim 1, wherein the controller is further operative to identify a given quantity of disadvantaged terminals belonging to said QoS class, and to detect error events in the data transmissions received from the given quantity of disadvantaged terminals, and is further configured to use the detected error events meeting a given statistical averaging of error events to update said QoS parameter.

14. The apparatus of claim 1, further comprising a channel estimator to estimate a channel gain for each of a plurality of terminals in each of at least two of the QoS classes, and wherein the controller is further operative to identify an order in the estimated channel gains and to identify whether terminals given as belonging to said QoS class are disadvantaged terminals based on a relative position or percentile range within the identified order of estimated channel gains.

15. The apparatus of claim 14, wherein the controller is further operative to determine terminals having an estimated channel gain within a given lower percentile to be disadvantaged terminals.

16. The apparatus of claim 1, wherein the controller is further operative to identify for at least one of the at least two terminals given as belonging to said QoS class a size of an active set of base stations associated with said QoS class, and to identify whether the terminal is a disadvantaged terminal based on the identified size of the active.

17. The apparatus of claim 1, wherein the controller is further operative to identify for at least one of the at least two terminals given as belonging to said QoS class at least one of a port set, a characteristic measurement or a restriction on use of the port set, a pilot strength, or carrier-to-noise (C/N) and is further configured to identify whether the terminal is a disadvantaged terminal based on one of, or on any combination or sub-combination of, the determined least one of a port set, a characteristic measurement or restriction on use of the port set, or the determined pilot strength, or C/N characteristic.

18. A method of implementing power control for Quality of Service (QoS) classes in a wireless communication system, comprising:

identifying, for each of at least two terminals given as belonging to a QoS class among a given plurality of QoS classes, whether the terminal is a disadvantaged terminal or a not disadvantaged terminal based on an estimated channel gain of the at least two terminals;

processing data transmissions received from one or both of the at least two terminals given as belonging to said QoS class to obtain, for each of at least two of the data transmissions, a status information indicating a received quality of the data transmission,

conditionally updating, conditional in part on said status information, a QoS parameter for said QoS class based at least in part on the status information and on whether the received and processed data transmission for which the status information is obtained is from a terminal identified as a disadvantaged terminal, wherein the conditional updating includes;

if said received and processed data transmission is from a terminal identified as a disadvantaged terminal, updating said QoS parameter for said QoS class, based at least in part, on the obtained status information and on at least one given requirement for said QoS class, and

if said received and processed data transmission is from a terminal not identified as a disadvantaged terminal, not updating said QoS parameter based on said status information sending the updated QoS parameter to at least two of the terminals given as belonging to the said QoS class.

19. The method of claim 18, further comprising estimating a channel gain for a plurality of terminals given as belonging to said QoS class, and wherein said identifying whether at least one of the at least two terminals given as belonging to said QoS class is a disadvantaged terminal includes a comparison of the estimated channel gains against a given gain threshold.

20. The method of claim 19, wherein identifying disadvantaged terminals compares the estimated channel gains against the given gain threshold to identify a given quantity of disadvantaged terminals given as belonging to said QoS class, wherein the method further includes detecting error events in the data transmissions received from the given quantity of disadvantaged terminals, and wherein the conditional updating is further based on said detected error events meeting a given statistical averaging of error events.

21. The method of claim 18, further comprising:

identifying for at least one of the at least two terminals given as belonging to said QoS class a size of an active set of base stations associated with said QoS class, and

wherein identifying whether the terminal is a disadvantaged terminal is based on the identified size of the active set.

22. The method of claim 18, further comprising estimating a channel gain for each of a plurality of terminals in each of the QoS classes, and wherein identifying, for each of at least two terminals given as belonging to said QoS class, whether the terminal is a disadvantaged terminal or a not disadvantaged terminal includes identifying an order in the estimated channel gains and identifying terminals to be disadvantaged terminals based on a relative position or percentile range within the identified order of estimated channel gains.

23. The method of claim 18, further comprising:

identifying for each of a plurality of terminals in each of the QoS classes at least one of a port set, a characteristic measurement or a restriction on use of the port set, a pilot strength, or carrier-to-noise (C/N); and

determining whether the terminal is a disadvantaged terminal in that QoS class, based on at least in part on any one of, or on any combination or sub-combination of the identifying of a port set, a characteristic measurement or restriction on use of the port set, or the determined pilot strength, or C/N characteristic.

24. The method of claim 18, further comprising sending the updated QoS parameter to at least two of the terminals given as belonging to said QoS class.

25. The method of claim 18, wherein the least two of the terminals to which the updated QoS parameter is sent include a disadvantaged terminal belonging said QoS class and a not disadvantaged terminal belong to said QoS class, and

wherein the method further comprises using the updated QoS parameter, by said disadvantaged terminal and by said not disadvantaged terminal for respective power control of respective subsequent data transmissions associated with said QoS.

26. An apparatus for power control for QoS classes in a wireless communication system, comprising:

a processor operative to process received data transmissions for each of at least two of a plurality of Quality of Service (QoS) classes, the received data transmissions for each of at least two of QoS classes being received at a base station from at least two terminals among a plurality of terminals associated with the QoS class, to obtain a respective status information for each of at least two received data transmissions for each of the at least two QoS classes, wherein the obtained status information indicates a received quality of the data transmission; and

a controller operative to update a QoS metric for each of the at least two QoS classes, based on the status information obtained for the received data transmissions for the QoS class, wherein the QoS metric indicates any among, or any combination of, a transmission delay, a packet error rate, or a packet jitter of data transmissions for the QoS class received from one or more of the at least two terminals,

wherein the controller is further operative to update a corresponding QoS parameter for each of the at least two QoS classes based on a comparison of the updated QoS metric for the QoS class to at least one requirement for the QoS class, wherein the QoS parameter is a power control parameter for use by at least two terminals associated with the QoS class and to send the updated QoS parameter to each of the at least two terminals associated with the QoS.

27. The apparatus of claim 26, wherein the plurality of QoS classes support a plurality of services, and wherein the at least one requirement for each QoS class is determined based on at least one performance requirement for a service mapped to the QoS class.

28. The apparatus of claim 26, wherein the processor is further operative to derive a signal-to-noise-and-interference ratio (SNR) estimate for each of at least two of the plurality of terminals, and wherein the controller is further operative to generate a transmit power control (TPC) command for each terminal based on the SNR estimate for the terminal.

29. The apparatus of claim 26, further comprising:

an interference estimator operative to estimate inter-sector interference observed by the base station, and wherein the controller is further operative to generate an indication of the inter-sector interference observed by the base station.

30. The apparatus of claim 29, wherein the further controller is operative to generate an other-sector interference (OSI) bit indicative of the inter-sector interference observed by the base station relative to an interference threshold.

31. The apparatus of claim 26, wherein the controller is further operative to update an overlapping factor based on the at least one QoS metric, the overlapping factor being indicative of an average number of overlapping transmissions for the base station.

32. An integrated circuit comprising a storage unit having software code stored thereon, the software code being executable by a processor and when executed by the processor cause the processor to:

identify, for each of at least two terminals given as belonging to a Quality of Service (QoS) class among a given plurality of QoS classes, whether the terminal is a disadvantaged terminal or a not disadvantaged terminal based on an estimated channel gain of the at least two terminals;

process data transmissions received from one or both of the at least two terminals given as belonging to said QoS class to obtain, for each of at least two of the data transmissions, a status information indicating a received quality of the data transmission; and

conditionally update, conditional in part on said status information, a QoS parameter for said QoS class based at least in part on the status information and on whether the received and processed data transmission for which the status information is obtained is from a terminal identified as a disadvantaged terminal, wherein the conditional updating includes;

if said received and processed data transmission is from a terminal identified as a disadvantaged terminal, update said QoS parameter for said QoS class, based at least in part, on the obtained status information and on at least one given requirement for said QoS class, and

if said received and processed data transmission is from a terminal not identified as a disadvantaged terminal, not update said QoS parameter based on said status information.

33. The integrated circuit of claim 32, wherein the storage unit has further software code stored thereon, the further software code being executable by a processor and when executed by the processor causes the processor to:

send the updated QoS parameter to at least two of the terminals given as belonging to the said QoS class.

34. A processor-readable storage, with software code instructions stored thereon, comprising software code that when executed by a processor causes the processor to:

identify, for each of at least two terminals given as belonging to a Quality of Service (QoS) class among a given plurality of QoS classes, whether the terminal is a disadvantaged terminal or a not disadvantaged terminal based on an estimated channel gain of the at least two terminals;

process data transmissions received from one or both of the at least two terminals given as belonging to said QoS class to obtain, for each of at least two of the data transmissions, a status information indicating a received quality of the data transmission,

conditionally update, conditional in part on said status information, a QoS parameter for said QoS class based at least in part on the status information and on whether the received and processed data transmission for which the status information is obtained is from a terminal identified as a disadvantaged terminal, wherein the conditional updating includes;

if said received and processed data transmission is from a terminal identified as a disadvantaged terminal, update said QoS parameter for said QoS class, based at least in part, on the obtained status information and on at least one given requirement for said QoS class, and

if said received and processed data transmission is from a terminal not identified as a disadvantaged terminal, not update said QoS parameter based on said status information.

35. The processor-readable storage of claim 34, further comprising software code that when executed by a processor causes the processor to:

send the updated QoS parameter to at least two of the terminals given as belonging to the said QoS class.