Mobility management within a wireless communications network

• US 8,565,233 B2
• Filed: 09/22/2008
• Issued: 10/22/2013
• Est. Priority Date: 09/24/2007
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc., Saab AB
• Original Assignee: Qualcomm, Inc.
• Inventors: Song, Bongyong, Attar, Rashid Ahmed, Gurelli, Mehmet
• Primary Examiner(s): HO, DUC CHI
• Application Number:
  US12/235,281
• Publication Number:
  US 20090080363A1
• Time in Patent Office: 1,856 Days
• Field of Search: 370/390, 370/432, 370/338, 455/518, 455/519
• US Class Current: 370/390
• CPC Class Codes: H04L 12/185 with management of multicast group membership
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04W 72/30 Resource management for broadcast services

Abstract

Aspects of mobility management within a wireless communications network including a plurality of sectors are disclosed. In an example, the wireless communications network includes a first cluster of sectors with at least one target sector and at least one supporting sector. The multicast communication session is carried within both the target and supporting sectors. In another example, a second cluster can be included within the network for supporting the same multicast communication session that includes its own target and supporting sectors. In this example, the first cluster transmits multicast media on a first interlace-multiplex (IM) pair of a downlink broadcast channel (BCH) and the second cluster transmits multicast media on a second IM pair of the downlink BCH. If sectors of the first and second clusters overlap, the network controls a manner in which the first and second clusters carry the multicast media.

Claims

1. A method of mobility management within a wireless communications network including a plurality of sectors, comprising:

forming a target sector group, the target sector group including at least one target sector from among the plurality of sectors, each target sector expected to have or having one or more access terminals belonging to a given multicast group;

determining a neighbor sector group based on the target sector group, the neighbor sector group configured to include at least one neighbor sector of the at least one target sector of the target sector group;

forming a supporting sector group based on the determined neighbor sector group, the supporting sector group including at least one supporting sector from among the plurality of sectors, each supporting sector not being a target sector; and

transmitting multicast messages associated with the given multicast group in the at least one target sector and the at least one supporting sector.

2. The method of claim 1, wherein a set of neighbor sectors for each target sector of the target sector group is populated before the determining step, and the determining step retrieves each set of neighbor sectors in order to determine the neighbor sector group for the target sector group.

3. The method of claim 2, wherein the set of neighbor sectors for a given target sector is pre-defined for the given target sector based on an expected degree to which signals from the set of neighbor sectors can be soft-combined within the given target sector.

4. The method of claim 1, wherein the determined neighbor sector group is a single-tier neighbor sector group including only the at least one neighbor sectors of the at least one target sector of the target sector group.

5. The method of claim 4, wherein forming the supporting sector group includes:

evaluating whether the single-tier neighbor sector group includes one or more target sectors that also belong to the target sector group.

6. The method of claim 5, wherein forming the supporting sector group further includes:

removing, based on the evaluating step, the one or more target sectors from the single-tier neighbor sector group; and

setting the supporting sector group equal to the single-tier neighbor sector group.

7. The method of claim 1, wherein the determined neighbor sector group is a double-tiered neighbor sector group including (i) the at least one neighbor sector of the at least one target sector of the target sector group and (ii) the neighbor sectors of the neighbor sectors of the at least one target sector of the target sector group.

8. The method of claim 7, wherein forming the supporting sector group includes:

evaluating whether the double-tiered neighbor sector group includes one or more target sectors that also belong to the target sector group.

9. The method of claim 8, wherein forming the supporting sector group further includes:

removing, based on the evaluating step, the one or more target sectors from the double-tiered neighbor sector group; and

setting the supporting sector group equal to the double-tiered neighbor sector group.

10. The method of claim 1, wherein forming the supporting sector group includes:

evaluating whether the determined neighbor sector group includes one or more target sectors that also belong to the target sector group.

11. The method of claim 10, wherein forming the supporting sector group further includes:

removing, based on the evaluating step, the one or more target sectors from the determined neighbor sector group; and

setting the supporting sector group equal to the neighbor sector group.

12. The method of claim 1, further comprising:

transmitting, at the target sector group, a first type of scheduling message configured to suppress registration feedback from one or more access terminals; and

transmitting, at the supporting sector group, a second type of scheduling message configured to prompt registration feedback from the one or more access terminals.

13. A method of mobility management within a wireless communications network including a plurality of sectors, comprising:

forming a target sector group, the target sector group including at least one target sector from among the plurality of sectors, each target sector expected to have or having one or more access terminals belonging to a given multicast group;

forming a supporting sector group based on at least one supporting sector value, the at least one supporting sector value being a target number of supporting sectors associated with the supporting sector group, the supporting sector group including at least one supporting sector from among the plurality of sectors, each supporting sector not being a target sector; and

transmitting multicast messages associated with the given multicast group in the at least one target sector and the at least one supporting sector.

14. The method of claim 13, further comprising:

determining an individual neighbor sector group for each target sector of the target sector group, each individual neighbor sector group including a set of neighbor sectors for one target sector;

modifying the individual neighbor sector groups until each individual neighbor sector group includes a number of sectors equal to a given supporting sector value among the at least one supporting sector value;

merging each individual neighbor sector group after the modifying step;

removing any target sectors from the merged group; and

setting the supporting sector group equal to the merged group after the removing step.

15. The method of claim 14, wherein the determining the individual neighbor sector group step and modifying step are performed before the forming the target sector group step and the forming the supporting sector group.

16. The method of claim 14, wherein the modifying step includes removing one or more sectors from the individual neighbor sector group if the target number of sectors within the individual neighbor sector group exceeds its associated given supporting sector value.

17. The method of claim 16, wherein the removed target sector corresponds to a most geographically distant sector from the target sector associated with the individual neighbor sector group.

18. The method of claim 14, wherein the given supporting sector value is sector-specific such that the at least one supporting sector value includes two or more different supporting sector values.

19. The method of claim 14, wherein the given supporting sector is global such that the at least one supporting sector value includes a single supporting sector value, the single supporting sector value being the same for each of the individual neighbor sector groups.

20. The method of claim 14, wherein the modifying step includes adding one or more sectors to the individual neighbor sector group if the target number of sectors within the individual neighbor sector group is less than its associated supporting sector value.

21. The method of claim 20, wherein one added sector corresponds to the most geographically close sector to the target sector associated with the individual neighbor sector group that does not yet belong to the individual neighbor sector group.

22. An access network configured to manage a plurality of sectors of a wireless communications network, comprising:

logic configured to form a target sector group, the target sector group including at least one target sector from among the plurality of sectors, each target sector expected to have or having one or more access terminals belonging to a given multicast group;

logic configured to determine a neighbor sector group based on the target sector group, the neighbor sector group configured to include at least one neighbor sector of the at least one target sector of the target sector group;

logic configured to form a supporting sector group based on the determined neighbor sector group, the supporting sector group including at least one supporting sector from among the plurality of sectors, each supporting sector not being a target sector; and

logic configured to transmit multicast messages associated with the given multicast group in the at least one target sector and the at least one supporting sector.

23. The access network of claim 22, wherein the logic configured to form the supporting sector group evaluates whether the determined neighbor sector group includes one or more target sectors that also belong to the target sector group.

24. The access network of claim 23, wherein the logic configured to form the supporting sector group further removes, based on the evaluation, the one or more target sectors from the determined neighbor sector group, and sets the supporting sector group equal to the neighbor sector group.

25. The access network of claim 22, further comprising:

logic configured to transmit, at the target sector group, a first type of scheduling message configured to suppress registration feedback from the one or more access terminals; and

logic configured to transmit, at the supporting sector group, a second type of scheduling message configured to prompt registration feedback from the one or more access terminals.

26. An access network configured to manage a plurality of sectors of a wireless communications network, comprising:

logic configured to form a target sector group, the target sector group including at least one target sector from among the plurality of sectors, each target sector expected to have or having one or more access terminals belonging to a given multicast group;

logic configured to form a supporting sector group based on at least one supporting sector value, the at least one supporting sector value being a target number of supporting sectors associated with the supporting sector group, the supporting sector group including at least one supporting sector from among the plurality of sectors, each supporting sector not being a target sector; and

logic configured to transmit multicast messages associated with the given multicast group in the at least one target sector and the at least one supporting sector.

27. The access network of claim 26, further comprising:

logic configured to determine an individual neighbor sector group for each target sector of the target sector group, each individual neighbor sector group including a set of neighbor sectors for one target sector;

logic configured to modify the individual neighbor sector groups until each individual neighbor sector group includes a number of sectors equal to a given supporting sector value among the at least one supporting sector value;

logic configured to merge each individual neighbor sector group after the modification;

logic configured to remove any target sectors from the merged group; and

logic configured to set the supporting sector group equal to the merged group after the removal.

28. The access network of claim 27, wherein the logic configured to modify removes one or more sectors from the individual neighbor sector group if the number of sectors within the individual neighbor sector group exceeds its associated given supporting sector value.

29. The access network of claim 27, wherein the logic configured to modify adds one or more sectors to the individual neighbor sector group if the number of sectors within the individual neighbor sector group is less than its associated supporting sector value.

30. An access network configured to manage a plurality of sectors of a wireless communications network, comprising:

means for forming a target sector group, the target sector group including at least one target sector from among the plurality of sectors, each target sector expected to have or having one or more access terminals belonging to a given multicast group;

means for determining a neighbor sector group based on the target sector group, the neighbor sector group configured to include at least one neighbor sector of the at least one target sector of the target sector group;

means for forming a supporting sector group based on the determined neighbor sector group, the supporting sector group including at least one supporting sector from among the plurality of sectors, each supporting sector not being a target sector; and

means for transmitting multicast messages associated with the given multicast group in the at least one target sector and the at least one supporting sector.

31. The access network of claim 30, wherein the means for forming the supporting sector group evaluates whether the determined neighbor sector group includes one or more target sectors that also belong to the target sector group.

32. The access network of claim 31, wherein the means for forming the supporting sector group further removes, based on the evaluation, the one or more target sectors from the determined neighbor sector group, and sets the supporting sector group equal to the neighbor sector group.

33. The access network of claim 30, further comprising:

means for transmitting, at the target sector group, a first type of scheduling message configured to suppress registration feedback from the one or more access terminals; and

means for transmitting, at the supporting sector group, a second type of scheduling message configured to prompt registration feedback from the one or more access terminals.

34. An access network configured to manage a plurality of sectors of a wireless communications network, comprising:

means for forming a target sector group, the target sector group including at least one target sector from among the plurality of sectors, each target sector expected to have or having one or more access terminals belonging to a given multicast group;

means for forming a supporting sector group based on at least one supporting sector value, the at least one supporting sector value being a target number of supporting sectors associated with the supporting sector group, the supporting sector group including at least one supporting sector from among the plurality of sectors, each supporting sector not being a target sector; and

means for transmitting multicast messages associated with the given multicast group in the at least one target sector and the at least one supporting sector.

35. The access network of claim 34, further comprising:

means for determining an individual neighbor sector group for each target sector of the target sector group, each individual neighbor sector group including a set of neighbor sectors for one target sector;

means for modifying the individual neighbor sector groups until each individual neighbor sector group includes a number of sectors equal to a given supporting sector value among the at least one supporting sector value;

means for merging each individual neighbor sector group after the modification;

means for removing any target sectors from the merged group; and

means for setting the supporting sector group equal to the merged group after the removal.

36. The access network of claim 35, wherein the means for modifying removes one or more sectors from the individual neighbor sector group if the number of sectors within the individual neighbor sector group exceeds its associated given supporting sector value.

37. The access network of claim 35, wherein the means for modifying adds one or more sectors to the individual neighbor sector group if the number of sectors within the individual neighbor sector group is less than its associated supporting sector value.

38. A non-transitory computer-readable medium including program code stored thereon, the program code configured to operate within an access network configured to manage a plurality of sectors of a wireless communications network, comprising:

program code to form a target sector group, the target sector group including at least one target sector from among the plurality of sectors, each target sector expected to have or having one or more access terminals belonging to a given multicast group;

program code to determine a neighbor sector group based on the target sector group, the neighbor sector group configured to include at least one neighbor sector of the at least one target sector of the target sector group;

program code to form a supporting sector group based on the determined neighbor sector group, the supporting sector group including at least one supporting sector from among the plurality of sectors, each supporting sector not being a target sector; and

program code to transmit multicast messages associated with the given multicast group in the at least one target sector and the at least one supporting sector.

39. The non-transitory computer-readable medium of claim 38, wherein the program code to form the supporting sector group evaluates whether the determined neighbor sector group includes one or more target sectors that also belong to the target sector group.

40. The non-transitory computer-readable medium of claim 39, wherein the program code to form the supporting sector group further removes, based on the evaluation, the one or more target sectors from the determined neighbor sector group, and sets the supporting sector group equal to the neighbor sector group.

41. The non-transitory computer-readable medium of claim 38, further comprising:

program code to transmit, at the target sector group, a first type of scheduling message configured to suppress registration feedback from the one or more access terminals; and

program code to transmit, at the supporting sector group, a second type of scheduling message configured to prompt registration feedback from the one or more access terminals.

42. A non-transitory computer-readable medium including program code stored thereon, the program code configured to operate within an access network configured to manage a plurality of sectors of a wireless communications network, comprising:

program code to form a target sector group, the target sector group including at least one target sector from among the plurality of sectors, each target sector expected to have or having one or more access terminals belonging to a given multicast group;

program code to form a supporting sector group based on at least one supporting sector value, the at least one supporting sector value being a target number of supporting sectors associated with the supporting sector group, the supporting sector group including at least one supporting sector from among the plurality of sectors, each supporting sector not being a target sector; and

program code to transmit multicast messages associated with the given multicast group in the at least one target sector and the at least one supporting sector.

43. The non-transitory computer-readable medium of claim 42, further comprising:

program code to determine an individual neighbor sector group for each target sector of the target sector group, each individual neighbor sector group including a set of neighbor sectors for one target sector;

program code to modify the individual neighbor sector groups until each individual neighbor sector group includes a number of sectors equal to a given supporting sector value among the at least one supporting sector value;

program code to merge each individual neighbor sector group after the modification;

program code to remove any target sectors from the merged group; and

program code to set the supporting sector group equal to the merged group after the removal.

44. The non-transitory computer-readable medium of claim 43, wherein the program code to modify removes one or more sectors from the individual neighbor sector group if the number of sectors within the individual neighbor sector group exceeds its associated given supporting sector value.

45. The non-transitory computer-readable medium of claim 43, wherein the program code to modify adds one or more sectors to the individual neighbor sector group if the number of sectors within the individual neighbor sector group is less than its associated supporting sector value.