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1. WO2004059993 - CONTROLE D'ADMISSIONS DANS UN RESEAU DE COMMUNICATION SANS FIL

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CLAIMS
What is claimed is:
1. A method of call admission in a wireless communication network comprising:
receiving an admission request from a mobile station;
determining relative availabilities of power and code resources on one or more
forward link CDMA channels; and
admitting the mobile station for service as a power-efficient user or as a code- efficient user based on the relative availabilities of power and code
resources such that neither power resources nor code resources are
disproportionately consumed as mobile stations are admitted for service.

2. The method of claim 1 , wherein admitting the mobile station as a power-efficient user or as a code-efficient user comprises selecting between first and second service configurations for the mobile station, wherein, under equivalent channel conditions, the first service configuration is more power-efficient and the second service configuration is more code-efficient.

3. The method of claim 2, wherein the network comprises an IS-2000 network, and wherein selecting between first and second service configurations for the mobile station comprises selecting either Radio Configuration 3 (RC3) or Radio Configuration 4 (RC4) for serving the mobile station.

4. The method of claim 3, wherein selecting between first and second service configurations for the mobile station comprises defining an admission threshold for either RC3 or RC4, and admitting the mobile station as either a RC3 or a RC4 user based on comparing a current ratio of power/code usage to the admission threshold.

5. The method of claim 4, further comprising dynamically updating the admission threshold based on current power and code resource availabilities on the one or more CDMA channels such that the admission threshold tracks changing service conditions.

6. The method of claim 1 , further comprising reassigning previously admitted mobile stations from being power-efficient users to being code-efficient users or vice versa, as needed, to maintain a desired balance between power resource and code resource usage on the one or more CDMA channels.

7. The method of claim 1 , wherein determining relative availabilities of power and code resources on one or more CDMA channels comprises determining a combined power/code usage ratio for a neighborhood of CDMA channels.

8. The method of claim 7, wherein determining a combined power/code usage ratio for a neighborhood of CDMA channels comprises computing weighted power usage and code usage values for the neighborhood of CDMA channels using one or more mobility-based weighting values.

9. The method of claim 8, wherein computing weighted power usage and code usage values for the neighborhood of CDMA channels using one or more mobility-based weighting values comprises:
computing first weighted power usage and code usage values for a first set of
channels in the neighborhood of CDMA channels;
computing second weighted power usage and code usage values for the
remaining channels in the neighborhood of CDMA channels; and
determining the current power/code usage as a combination of the first and
second weighted power usage and code usage values.

10. The method of claim 9, further comprising weighting the first power and code usage values in inverse proportion to a system mobility value, and weighting the second power and code usage values in proportion to the system mobility value.

11. The method of claim 9, further comprising defining the first set of channels as at least including the CDMA channel associated with the admission request.

12. The method of claim 9, further comprising defining the first set of channels based on at least a subset of the CDMA channels identified in a radio environment report from the mobile station.

13. The method of claim 7, further comprising defining the neighborhood of CDMA channels based on an originating service area of the mobile station and configured network data.

14. The method of claim 7, further comprising defining the neighborhood of CDMA channels based on an active set report from the mobile station.

15. The method of claim 1 , wherein determining relative availabilities of power and code resources on one or more CDMA channels comprises determining available forward link transmit power and available forward link spreading codes at one or more Radio Base Stations (RBSs) that provide the one or more CDMA channels.

16. The method of claim 1 , wherein admitting the mobile station for service as a power-efficient user or as a code-efficient user based on the relative availabilities of power and code resources comprises determining one or more admission metrics that indicate whether power or code-efficient admission of the mobile station would move current power/code usage closer to a nominal power/code usage line.

17. The method of claim 1 , wherein admitting the mobile station for service as a power-efficient user or as a code-efficient user based on the relative availabilities of power and code resources comprises admitting the mobile station as a power-efficient user if the relative availability of power resources is less than the relative availability of code resources, or admitting the mobile station as a code-efficient user if the relative availability of code resources is less than the relative availability of power resources.

18. The method of claim 1 , further comprising admitting mobile stations for service as power-efficient or code-efficient users based on reception conditions for the mobile stations.

19. The method of claim 16, wherein admitting mobile stations for service as power-efficient or code-efficient users based on reception conditions for the mobile stations comprises admitting a mobile station as a code-efficient user if a carrier-to-interference (C/l) ratio for the mobile station is at or above a threshold value, and admitting the mobile station as a power-efficient user if the C/l ratio is below a threshold value.

20. The method of claim 1 , wherein admitting the mobile station for service as a power-efficient user or as a code-efficient user based on the relative availabilities of power and code resources further comprises additionally considering a carrier-to-interference (C/l) ratio for the mobile station, such that the admission decision is biased toward power-efficient user admission if the C/l ratio is below a threshold value.

21. A Base Station Controller (BSC) for use in a wireless communication network comprising:
call processing resources including a Radio Base Station (RBS) interface for
communicating with one or more RBSs; and
an admission controller configured to perform call admissions based on:
receiving an admission request from a mobile station;
determining relative availabilities of power and code resources on one or
more CDMA channels; and
admitting the mobile station for service as a power-efficient user or as a
code-efficient user based on the relative availabilities of power
and code resources such that neither power resources nor code
resources are disproportionately consumed as mobile stations are
admitted for service.

22. The BSC of claim 21 , wherein the BSC admits the mobile station as a power-efficient user or as a code-efficient user by selecting between first and second service configurations for the mobile station, wherein, under equivalent channel conditions, the first service configuration is more power-efficient and the second service configuration is more code-efficient.

23. The BSC of claim 22, wherein the BSC operates in an IS-2000 network, and wherein the BSC selects between first and second service configurations for the mobile station by selecting either Radio Configuration 3 (RC3) or Radio Configuration 4 (RC4) for serving the mobile station.

24. The BSC of claim 23, wherein the BSC selects between first and second service configurations for the mobile station by defining an admission threshold for either RC3 or RC4, and admitting the mobile station as either a RC3 or a RC4 user based on comparing a current ratio of power/code usage to the admission threshold.

25. The BSC of claim 24, wherein the BSC dynamically updates the admission threshold based on current power and code resource availabilities in the one or more service areas such that the admission threshold tracks changing service conditions at the one or more RBSs.

26. The BSC of claim 21 , wherein the BSC reassigns previously admitted mobile stations from being power-efficient users to being code-efficient users or vice versa, as needed, to maintain a desired balance between power resource and code resource at Radio Base Stations (RBSs) providing the one or more CDMA channels.

27. The BSC of claim 21 , wherein the BSC determines relative availabilities of power and code resources on the one or more CDMA channels by determining a combined power/code usage ratio for a neighborhood of CDMA channels.

28. The BSC of claim 27, wherein the BSC determines a combined power/code usage ratio for a neighborhood of CDMA channels by computing weighted power usage and code usage values for the neighborhood of CMDA channels using one or more mobility-based weighting values.

29. The BSC of claim 28, wherein the BSC computes weighted power usage and code usage values for the neighborhood of CDMA channels using one or more mobility-based weighting values based on:
computing first weighted power usage and code usage values for a first set of
channels in the neighborhood of CDMA channels;
computing second weighted power usage and code usage values for the
remaining channels in the neighborhood of CDMA channels; and
determining the current power/code usage as a combination of the first and
second weighted power usage and code usage values.

30. The BSC of claim 29, wherein the BSC weights the first power and code usage values in inverse proportion to a system mobility value, and weights the second power and code usage values in proportion to the system mobility value.

31. The BSC of claim 29, wherein the BSC defines the first set of channels as at least including the CDMA channel associated with the admission request.

32. The BSC of claim 29, wherein the BSC defines the first set of channels based on at least a subset of the CDMA channels identified in a radio environment report from the mobile station.

33. The BSC of claim 27, wherein the BSC defines the neighborhood of CMDA channels based on an originating service area of the mobile station and configured network data.

34. The BSC of claim 27, wherein the BSC defines the neighborhood of CDMA channels based on an active set report from the mobile station.

35. The BSC of claim 27, wherein the BSC determines relative availabilities of power and code resources on the one or more CMDA channels by determining available forward link transmit power and available forward link spreading codes at one or more Radio Base Stations (RBSs).

36. The BSC of claim 21 , wherein the BSC determines relative availabilities of power and code resources on one or more CDMA channels by determining available forward link transmit power and available forward link spreading codes at one or more Radio Base Stations (RBSs).

37. The BSC of claim 21 , wherein the BSC admits the mobile station for service as a power-efficient user or as a code-efficient user based on the relative availabilities of power and code resources by determining one or more admission metrics that indicate whether power or code-efficient admission of the mobile station would move current power/code usage for the one or more CDMA channels closer to a nominal power/code allocation line.

38. The BSC of claim 21 , wherein the BSC admits the mobile station for service as a power-efficient user or as a code-efficient user based on the relative availabilities of power and code resources by admitting the mobile station as a power-efficient user if the availability of power resources is less than the availability of code resources, or by admitting the mobile station as a code-efficient user if the availability of code resources is less than the availability of power resources.

39. The BSC of claim 21 , wherein the BSC admits the mobile station for service as a power-efficient user or as a code-efficient user further based on a carrier-to-interference (C/l) ratio for the mobile station, such that the admission decision is biased toward power-efficient user admission if the C/l ratio is below a threshold value.