RELIABILITY OF VoLTE/ViLTE CALLS

Patent metadata

Field	Value
Publication number	US-2017374635-A1
Application number	US-201615194208-A
Country	US
Kind code	A1
Filing date	Jun 27, 2016
Priority date	Jun 27, 2016
Publication date	Dec 28, 2017
Grant date	—

Abstract

A method for improving reliability of Voice over LTE (VoLTE)/Video over LTE (ViLTE) calls includes detecting, by a User Equipment (UE) camped on a first Radio Access Technology (RAT), a problem with a radio connection on the first RAT at a first time. After detecting the problem with the radio connection, the UE blocks Non-Access Stratum (NAS) registration on a second RAT in a time period between the first time and a second time later than the first time. The second RAT is different than the first RAT.

First claim

What is claimed is:

1 . A method, comprising:
detecting, by a User Equipment (UE) camped on a first Radio Access Technology (RAT), a problem with a radio connection on the first RAT at a first time; and blocking, by the UE, Non Access Stratum (NAS) registration on a second RAT in a time period between the first time and a second time later than the first time.

2 . The method of claim 1 , wherein the first RAT is a Long Term Evolution (LTE) RAT, the second RAT is a non-LTE RAT, and the problem with the radio connection is a Radio Link Failure (RLF).

3 . The method of claim 1 , further comprising:
scanning, by the UE, a set of frequencies including the second RAT frequencies in the time period.

4 . The method of claim 1 , further comprising:
allowing, by the UE, the NAS registration on the second RAT at a third time equal to or later than the second time.

5 . The method of claim 1 , wherein blocking NAS registration on the second RAT is performed based on a determination that the UE is having a voice connection, a voice emergency connection, a video call connection, or any connection that is considered as from a Conversational Quality of Service.

6 . The method of claim 1 , wherein a time difference between the second and the first time is substantially similar to a value of a T 311 timer, shorter than the value of the T 311 timer, or substantially similar to a value of a Real Time Protocol (RTP) timer.

7 . The method of claim 1 , wherein the second RAT is different than the first RAT.

8 . A device camped on a first Radio Access Technology (RAT), comprising:
a memory; and at least one processor communicatively coupled with the memory and configured to:
detect a problem with a radio connection on the first RAT at a first time; and
block Non-Access Stratum (NAS) registration on a second RAT in a time period between the first time and a second time later than the first time.

9 . The device of claim 8 , wherein the first RAT is a Long Term Evolution (LTE) RAT, the second RAT is a non-LTE RAT, and the problem with the radio connection is a Radio Link Failure (RLF).

10 . The device of claim 8 , wherein the at least one processor is further configured to:
scan a set of frequencies including the second RAT frequencies in the time period.

11 . The device of claim 8 , wherein the at least one processor is further configured to:
allow the NAS registration on the second RAT at a third time equal to or later than the second time.

12 . The device of claim 8 , wherein blocking NAS registration on the second RAT is performed based on a determination that the device is having a voice connection, a voice emergency connection, a video call connection, or any connection that is considered as from a Conversational Quality of Service.

13 . The device of claim 8 , wherein a time difference between the second and the first time is substantially similar to a value of a T 311 timer, shorter than the value of the T 311 timer, or substantially similar to a value of a Real Time Protocol (RTP) timer.

14 . The device of claim 8 , wherein the second RAT is different than the first RAT.

15 . A non-transitory computer-readable medium containing instructions which, when executed, cause a computing device camped on a first Radio Access Technology (RAT) to perform operations comprising:
detecting a problem with a radio connection on the first RAT at a first time; and blocking Non Access Stratum (NAS) registration on a second RAT in a time period between the first time and a second time later than the first time.

16 . The non-transitory computer-readable medium of claim 15 , wherein the first RAT is a Long Term Evolution (LTE) RAT, the second RAT is a non-LTE RAT, and the problem with the radio connection is a Radio Link Failure (RLF).

17 . The non-transitory computer-readable medium of claim 15 , wherein the operations further comprise:
scanning a set of frequencies including the second RAT frequencies in the time period.

18 . The non-transitory computer-readable medium of claim 15 , wherein the operations further comprise:
allowing the NAS registration on the second RAT at a third time equal to or later than the second time.

19 . The non-transitory computer-readable medium of claim 15 , wherein blocking NAS registration on the second RAT is performed based on a determination that the computing device is having a voice connection, a voice emergency connection, a video call connection, or any connection that is considered as from a Conversational Quality of Service.

20 . The non-transitory computer-readable medium of claim 15 , wherein a time difference between the second and the first time is substantially similar to a value of a T 311 timer, shorter than the value of the T 311 timer, or substantially similar to a value of a Real Time Protocol (RTP) timer.

Assignees

• Blackberry Ltd

Inventors

• Islam Muhammad Khaledul
• Wirtanen Jeffrey William
• Zhang yi hai
• Chaudry Shahid Rasul
• Arzelier Claude Jean-Frederic

Classifications

• H04W60/00 Primary

  Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration · CPC title

• H04W76/19 Primary

  Connection re-establishment · CPC title

• H04W76/028

  Electricity · mapped topic