Methods and apparatus for dedicated bearer establishment handling during call setup for LTE

Patent metadata

Field	Value
Publication number	US-10110644-B2
Application number	US-201615148741-A
Country	US
Kind code	B2
Filing date	May 6, 2016
Priority date	Feb 17, 2016
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

Aspects relate to methods and apparatus for dedicated bearer (DB) establishment handling during call setup for long term evolution. According to aspects, a method is provided herein for wireless communications that may be performed, for example, by a user equipment (UE). The method generally includes establishing a connection with a first access point (AP) to perform a call set up procedure for a call; receiving from the first AP a message associated with handover to a second AP; delaying giving up the call setup procedure for a duration if the message includes or is associated with an indication to release a dedicated bearer; and allowing establishment of a DB with the second AP during the duration. Consequently, the DB can be established with the second AP, without the UE giving up the call setup, and the call can be performed, thus improving user experience. Numerous other aspects are provided.

First claim

What is claimed is:

1. A method for wireless communications by a user equipment (UE), comprising:
establishing a connection with a first access point (AP) to perform a call setup procedure for a call;
receiving from the first AP a message associated with handover to a second AP;
delaying giving up the call setup procedure for a duration if the message includes or is associated with an indication to release a dedicated bearer; and
allowing establishment of a dedicated bearer with the second AP during the duration.

2. The method of claim 1 , wherein delaying giving up the call setup procedure for the duration comprises at least one of:
maintaining the call setup procedure if the dedicated bearer is successfully established with the second AP during the duration; or
giving up the call setup procedure if the dedicated bearer is not established with the second AP during the duration.

3. The method of claim 1 , wherein the duration is based on a timer.

4. The method of claim 3 , wherein a length of the timer is based on at least one of: a type of the handover, one or more channel conditions at the first AP, or a difference between the one or more channel conditions at the first AP and one or more channel conditions at the second AP.

5. The method of claim 1 , wherein the call comprises a voice call, a video telephony (VT) call, or a voice over long term evolution (VoLTE) call.

6. The method of claim 1 , wherein giving up the call setup procedure comprises at least one of: sending an IP multimedia subsystem (IMS) cancel message if the call is a mobile originated (MO) call, or sending an IMS failure message if the call is a mobile terminated (MT) call.

7. The method of claim 1 , further comprising:
receiving another message from the first AP; and
delaying giving up the call setup procedure for a duration if the message includes or is associated with an indication of a dedicated bearer release or a dedicated bearer modification.

8. The method of claim 1 , further comprising:
delaying sending a measurement report if one or more channel conditions at the first AP satisfy a first threshold or if a difference between the one or more channel conditions at the first AP and one or more channel conditions at the second AP satisfy a second threshold to reduce a likelihood of receiving the message associated with handover prior to establishment of a dedicated bearer with the first AP.

9. The method of claim 1 , further comprising:
during or after establishment of the connection with the first AP, adjusting a priority of one or more channels used for at least one of: a message related to a Measurement Report or a message related to a signaling or default bearer setup to reduce a likelihood of receiving the message associated with handover prior to establishment of a dedicated bearer with the first AP.

10. A method for wireless communications by a network entity, comprising:
sending a request to a first access point (AP) to establish a dedicated bearer for a call;
receiving a request from the first AP to handover a user equipment (UE) to a second AP; and
delaying sending, to the second AP, the request to handover for a duration if the dedicated bearer has not been established with the first AP.

11. The method of claim 10 , wherein delaying sending, to the second AP, the request to handover for the duration, comprises at least one of:
sending, to the second AP, the request to handover if a message is received during the duration indicating that the dedicated bearer is successfully established with the first AP, wherein sending the request to handover comprises including or associating with the sending of the request an indication of the successful dedicated bearer establishment; or
sending, to the second AP, the request to handover without a dedicated bearer if the dedicated bearer is not successfully established during the duration.

12. The method of claim 10 , wherein the duration is based on a timer.

13. The method of claim 12 , wherein a length of the timer is based on a type of the requested handover.

14. The method of claim 10 , wherein the call comprises a voice, video telephony, or voice over long term evolution call.

15. The method of claim 10 , further comprising:
during establishment of the dedicated bearer with the first AP, adjusting a priority of one or more channels used for at least one of: a message related to handover or a message related to a signaling or default bearer setup to reduce a likelihood of receiving the request to handover prior to establishment of the dedicated bearer.

16. The method of claim 10 , further comprising:
after establishment of the connection with the first AP, adjusting a priority of one or more channels used for at least one of: a message related to measurement report, a message related to a handover, a message related to bearer setup, a message related to a bearer modification, or a message related to a bearer release to reduce a likelihood of receiving the request to handover prior to the completion of establishment of the dedicated bearer.

17. The method of claim 10 , wherein the network entity comprises a mobile management entity (MME).

18. A method for wireless communications by a user equipment (UE), comprising:
establishing a connection with a first access point (AP) to perform a call; and
taking action to reduce a likelihood of receiving from the first AP a message associated with handover to a second AP that includes or is associated with an indication to release a dedicated bearer prior to establishment of a dedicated bearer with the first AP.

19. The method of claim 18 , wherein the taking action comprises:
delaying sending a measurement report if one or more channel conditions at the first AP satisfy a first threshold or if a difference between the one or more channel conditions at the first AP and one or more channel conditions at the second AP satisfy a second threshold.

20. The method of claim 18 , wherein the taking action comprises:
during or after establishment of the connection with the first AP, adjusting a priority of one or more channels used for at least one of: a message related to a Measurement Report or a message related to a signaling or default bearer setup.

21. The method of claim 18 , wherein the call comprises a voice call, a video telephony (VT) call, or a voice over long term evolution (VoLTE) call.

22. An apparatus for wireless communications by a user equipment (UE), comprising:
means for establishing a connection with a first access point (AP) to perform a call setup procedure for a call;
means for receiving from the first AP a message associated with handover to a second AP;
means for delaying giving up the call setup procedure for a duration if the message includes or is associated with an indication to release a dedicated bearer; and
means for allowing establishment of a dedicated bearer with the second AP during the duration.

23. The apparatus of claim 22 , wherein the means for delaying giving up the call setup procedure for the duration comprises at least one of:
means for maintaining the call setup procedure if the dedicated bearer is successfully established with the second AP during the duration; or
means for giving up the call setup procedure if the dedicated bearer is not established with the second AP during the duration.

24. The apparatus of claim 22 , wherein the duration is based on a timer.

25. The appa

Assignees

• Qualcomm Inc
• Qualcomm Inc

Inventors

• Yang Ming
• Zhao Hui
• Balasubramanian Srinivasan

Classifications

• H04W72/56

  based on priority criteria · CPC title

• H04W76/15

  Setup of multiple wireless link connections · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04W88/08

  Access point devices · CPC title

• H04L65/1016

  IP multimedia subsystem [IMS] · CPC title