Nova Patents
EP3528552B1

Voice service in evolved packet system

Abstract

This record has no abstract on file.

EP3528552B1, drawing sheet 1
Sheet 1 of 26

Term

3.7 yearsleft in the term

Expires 3 June 2030.

  1. Priority and filed
  2. Granted
  3. Today
  4. Expires

14 claims: 12 independent, 2 dependent

  1. 1
    A method performed by a User Equipment, UE, with a voice setting determined by a first indicator related to voice services in an Evolved Packet System, EPS, the method comprising:receiving a Non Access Stratum, NAS, protocol Accept message with a second indicator indicating that an IP Multimedia Subsystem, IMS, voice over packet-switched, PS, session is supported;and responsive to the first indicator and the second indicator, determining availability of voice services over IMS, wherein determining the availability of voice services further comprises initiating (2A-1) an IMS registration when the UE is not already registered with the IMS;said method being characterized by the further steps of: if another UE indicator for usage setting is Data Only (1A-7, 72), in event of a failure of said IMS registration (70) and if an additional combined Tracking Area Update, TAU, for Circuit Switched, CS, Fallback, CSFB, also fails (1A-5), notifying to the user that voice services cannot be realized (5A-1) and, responsive to said notification, receiving from the user a first indication to accept the current Data Only UE usage setting (82), or a second indication to change the UE usage setting to Voice Centric or Data Centric (84);staying in current Radio Access Technology, RAT, (1A-8) if the UE received said first indication;selecting another RAT (lA-9;) if the UE received said second indication.
  2. 3
    The method according claim 2, wherein said indicator comprises at least one of a display alert, an audio alert, or a vibrating alert.
  3. 4
    The method according to any of claims 1 to 3, wherein said notification to the user also includes a prompt asking the user if he/she would like to change the UE usage setting in order to obtain voice services.
  4. 5
    The method according to any of claims 1 to 4, wherein the first indicator is set to "Internet Protocol Multimedia Subsystem, IMS, voice preferred, Circuit Switched, CS, voice secondary".
  5. 6
    The method according to any of claims 1 to 5, wherein the second indicator is provided by lower layers of the UE to upper layers of the UE;and optionally wherein availability of voice services over IMS changes due to the mobility of the UE.
  6. 7
    The method according to any of claims 1 to 6, wherein the second indicator is a Voice over IP Multimedia Subsystem, VoIMS, indicator.
  7. 8
    The method according to any of claims 1 to 7, wherein the NAS protocol Accept message comprises a NAS registration response message received by the lower layers of the UE.
  8. 9
    The method according to any of claims 1 to 8, wherein the NAS protocol Accept message is an ATTACH accept message, or a TRACKING AREA UPDATE ACCEPT message.
  9. 10
    The method according to any of claims 1 to 8 further comprising:based on said failure of the registration with the IMS (70), performing (1A-5) by the UE, a combined tracking area update, TAU.
  10. 11
    The method according to any of claims 1 to 10, wherein determining availability of voice services over IMS further comprises determining voice services over IMS when at least one of LTE or GERAN/UTRAN are unavailable and subsequently performing:receiving a second NAS registration response message with a third indicator;and initiating an IMS registration if the UE is not already IMS registered as determined by the third indicator.
  11. 13
    A non-transitory computer readable medium storing instructions that, when executed, cause a User Equipment, UE, to perform the method of any one of claims 1 to 12.
  12. 14
    A User Equipment, UE, comprising a processor configured to carry out the method of any one of claims 1 to 12.
Independent claims12