Application layer access channel congestion avoidance in group communications over broadcast/multicast services

• US 9,025,498 B2
• Filed: 12/25/2012
• Issued: 05/05/2015
• Est. Priority Date: 12/28/2011
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Anchan, Kirankumar, Lin, Yih-Hao, Maggenti, Mark A., Santhanam, Arvind V.
• Primary Examiner(s): Chery, Dady
• Application Number:
  US13/726,605
• Publication Number:
  US 20130170352A1
• Time in Patent Office: 861 Days
• Field of Search: 370/259, 370/260, 370/261, 370/395.42, 370/395.4, 370/395.41, 370/395.21, 370/352, 370/389, 370/338, 370/328
• US Class Current: 370/260
• CPC Class Codes: H04L 12/1868 Measures taken after transmission, e.g. acknowledgments
• CPC Class Codes: H04L 12/1881 with schedule organisation, e.g. priority, sequence management
• 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 28/0289 Congestion control load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like
• CPC Class Codes: H04W 76/40 for selective distribution or broadcast

Abstract

The disclosure is directed to prioritizing call announce response in a broadcast/multicast communication system. An embodiment establishes a first priority for response based on assigning each user equipment (UE) a first random delay for response to a first call announce, responds to the first call announce using the first random delay, and determines a second priority for response to a subsequent call announce based on an elapsed time that each UE is present in a multicast area.

Claims

1. A method for prioritizing call announce response in a broadcast/multicast communication system comprising:

establishing a first priority for response based on assigning to a user equipment (UE) a first random delay for response to a first call announce;

responding to the first call announce using the first random delay; and

determining a second priority for response to a subsequent call announce based on an elapsed time that the UE is present in a multicast area wherein the elapsed time is determined by starting a timer when the UE enters the multicast area.

2. The method of claim 1, wherein the first priority is assigned in two partitions each having a range of delay, the partitions including a first partition and a second partition.

3. The method of claim 2, wherein the first partition has a range of delay of 0 ms to 300 ms and the second partition has a range of delay of 600 ms to 1000 ms, and wherein the UE is assigned to a random time within one of the two partitions.

4. The method of claim 1, wherein the first priority is determined after receiving a reset signal from an application server.

5. The method of claim 1, wherein determining the second priority further comprises:

dividing the elapsed time into multiple thresholds;

selecting a delay time partition based on each threshold exceeded; and

selecting a second random time within the delay time partition.

6. The method of claim 5, wherein the second random time is determined as a random slot within the delay time partition.

7. The method of claim 5, wherein the delay time partition is reduced as the elapsed time is increased.

8. The method of claim 5, wherein the timer is suspended for short durations when the UE may be out of the multicast area.

9. The method of claim 5, wherein each threshold exceeded increases the second priority of the UE.

10. The method of claim 1, further comprising:

delaying the first random delay for response for an offset delay if there is an indication of a unicast target receiving the first call announce.

11. The method of claim 10, wherein the offset delay is a time taken for one round trip unicast message delivery.

12. The method of claim 11, wherein the offset delay is 500 ms.

13. The method of claim 10, wherein the indication the unicast target is provided only after a threshold number of unicast targets is predicted.

14. The method of claim 10, wherein the indication of the unicast target is provided based on a probability of at least one unicast target responding.

15. The method of claim 1, further comprising:

receiving an acknowledgement that a first response to the first call announce has been received; and

not responding after receiving the acknowledgment.

16. An apparatus for prioritizing call announce response in a broadcast/multicast communication system comprising:

logic configured to establish a first priority for response based on assigning each to a user equipment (UE) a first random delay for response to a first call announce;

logic configured to respond to the first call announce using the first random delay; and

logic configured to determine a second priority for response to a subsequent call announce based on an elapsed time that the UE is present in a multicast area, wherein the elapsed time is determined by starting a timer when the UE enters the multicast area.

17. The apparatus of claim 16, wherein the first priority is assigned in two partitions each having a range of delay, the partitions including a first partition and a second partition.

18. The apparatus of claim 17, wherein the first partition has a range of delay of 0 ms to 300 ms and the second partition has a range of delay of 600 ms to 1000 ms and wherein the UE is assigned to a random time within one of the two partitions.

19. The apparatus of claim 16, wherein the first priority is determined after receiving a reset signal from an application server.

20. The apparatus of claim 16, wherein the logic configured to determine the second priority further comprises:

logic configured to divide the elapsed time into multiple thresholds;

logic configured to select a delay time partition based on each threshold exceeded; and

logic configured to select a second random time within the delay time partition.

21. The apparatus of claim 20, wherein the second random time is determined as a random slot within the delay time partition.

22. The apparatus of claim 20, wherein the delay time partition is reduced as the elapsed time is increased.

23. The apparatus of claim 20, wherein the timer is suspended for short durations when the UE may be out of the multicast area.

24. The apparatus of claim 20, wherein each threshold exceeded increases the second priority of the UE.

25. The apparatus of claim 16, further comprising:

logic configured to delay the first random delay for response for an offset delay if there is an indication of a unicast target receiving the first call announce.

26. The apparatus of claim 25, wherein the offset delay is a time taken for one round trip unicast message delivery.

27. The apparatus of claim 26, wherein the offset delay is 500 ms.

28. The apparatus of claim 25, wherein the indication the unicast target is provided only after a threshold number of unicast targets is predicted.

29. The apparatus of claim 25, wherein the indication of the unicast target is provided based on a probability of at least one unicast target responding.

30. The apparatus of claim 16, further comprising:

logic configured to receive an acknowledgement that a first response to the first call announce has been received; and

logic configured to not respond after receiving the acknowledgment.

31. An apparatus for prioritizing call announce response in a broadcast/multicast communication system comprising:

means for establishing a first priority for response based on assigning to a user equipment (UE) a first random delay for response to a first call announce;

means for responding to the first call announce using the first random delay; and

means for determining a second priority for response to a subsequent call announce based on an elapsed time that the UE is present in a multicast area, wherein the elapsed time is determined by starting a timer when the UE enters the multicast area.

32. A non-transitory computer-readable medium for prioritizing call announce response in a broadcast/multicast communication system comprising:

at least one instruction to establish a first priority for response based on assigning to a user equipment (UE) a first random delay for response to a first call announce;

at least one instruction to respond to the first call announce using the first random delay; and

at least one instruction to determine a second priority for response to a subsequent call announce based on an elapsed time that the UE is present in a multicast area, wherein the elapsed time is determined by starting a timer when the UE enters the multicast area.