Transcoding avoidance during single radio voice call continuity (srvcc)

Patent metadata

Field	Value
Publication number	US-2020196202-A1
Application number	US-202016802834-A
Country	US
Kind code	A1
Filing date	Feb 27, 2020
Priority date	Sep 5, 2014
Publication date	Jun 18, 2020
Grant date	—

Abstract

Technology for transcoding avoidance is disclosed. A mobile switching center (MSC) server can decode a single radio voice call continuity (SRVCC) packet switch (PS) to circuit switched (CS) request message received from a mobility management entity (MME) that includes selected CODEC information for a selected CODEC used for a user equipment (UE) in an internet protocol (IP) Multimedia Subsystem (IMS) over long term evolution (LTE) system. The MSC server can encode the selected CODEC information for transmission to a target MSC to enable the target MSC to identify the selected CODEC for the UE to allow the selected CODEC to be used in the CS domain.

First claim

What is claimed is:

1 . At least one non-transitory machine readable storage medium having instructions embodied thereon for transcoding avoidance, the instructions when executed by one or more processors perform the following:
decoding, at a mobile switching center (MSC) server, a single radio voice call continuity (SRVCC) packet switch (PS) to circuit switched (CS) request message received from a mobility management entity (MME) that includes selected CODEC information for a selected CODEC used for a user equipment (UE) in an internet protocol (IP) Multimedia Subsystem (IMS) over long term evolution (LTE) system; and encoding, at the MSC server, the selected CODEC information for transmission to a target MSC to enable the target MSC to identify the selected CODEC for the UE to allow the selected CODEC to be used in the CS domain.

2 . The at least one non-transitory machine readable storage medium of claim 1 , further comprising instructions when executed perform the following: including the selected CODEC information in a synchronization indicator.

3 . The at least one non-transitory machine readable storage medium of claim 1 , further comprising instructions when executed perform the following: determining when the MSC server supports the selected CODEC used by the IMS over the LTE system.

4 . The at least one non-transitory machine readable storage medium of claim 1 , further comprising instructions when executed perform the following: using the selected CODEC to be used in a circuit switch (CS) domain according to the selected CODEC previously used in the IMS over LTE system during the SRVCC.

5 . The at least one non-transitory machine readable storage medium of claim 1 , further comprising instructions when executed perform the following: encoding the selected CODEC information for transmission to the target MSC and a radio station subsystem/base station system k (RNS/BSS) to enable the RNS/BSS to send to an evolved NodeB (eNB) the selected CODEC information included in a radio resource control (RRC) container of a target to source container.

6 . The at least one non-transitory machine readable storage medium of claim 1 , further comprising instructions when executed perform the following: notifying an access transfer control function (ATCF) of the selected CODEC information during a session transfer operation.

7 . The at least one non-transitory machine readable storage medium of claim 1 , further comprising instructions when executed perform the following: encoding the selected CODEC information for transmission to an access transfer gateway (ATGW).

8 . At least one non-transitory machine readable storage medium having instructions embodied thereon for transcoding avoidance, the instructions when executed by one or more processors perform the following:
decoding, at a mobile switching center (MSC) server, a single radio voice call continuity (SRVCC) packet switch (PS) to circuit switched (CS) request message received from a mobility management entity (MME); encoding, at the MSC server, a CODEC request message for transmission to an internet protocol (IP) Multimedia Subsystem (IMS); decoding, at the MSC server, a CODEC query response message received from the IMS that includes selected CODEC information for a selected CODEC used for a user equipment (UE) in an IMS over long term evolution LTE system; and encoding, at the MSC server, the selected CODEC information for transmission to a target MSC to enable the target MSC to identify the selected CODEC for the UE to allow the selected CODEC to be used in the CS domain.

9 . The at least one non-transitory machine readable storage medium of claim 8 , further comprising instructions when executed perform the following: querying the IMS for the selected CODEC information in the CODEC request message.

10 . The at least one non-transitory machine readable storage medium of claim 8 , further comprising instructions when executed perform the following: encoding the selected CODEC information for transmission to the target MSC and a radio station subsystem/base station system (RNS/BSS) to enable the RNS/BSS to send to an evolved NodeB (eNB) the selected CODEC information included in a radio resource control (RRC) container of the target to source container.

11 . The at least one non-transitory machine readable storage medium of claim 8 , further comprising instructions when executed perform the following: notifying an access transfer control function (ATCF) of the selected CODEC information during a session transfer operation.

12 . The at least one non-transitory machine readable storage medium of claim 8 , further comprising instructions when executed perform the following: encoding the selected CODEC information for transmission to an access transfer gateway (ATGW).

13 . The at least one non-transitory machine readable storage medium of claim 8 , further comprising instructions when executed perform the following: decoding the CODEC query response message received from the IMS that includes previously used CODEC information selected for a user equipment (UE) in the IMS over long term evolution LTE system.

14 . The at least one non-transitory machine readable storage medium of claim 8 , further comprising instructions when executed perform the following: indicating a priority indication in the SRVCC PS to CS request message for the target MSC to use the selected CODEC.

15 . The at least one non-transitory machine readable storage medium of claim 14 , further comprising instructions when executed perform the following: encoding a prepare handover request for transmission to the target MSC with the priority indication in the SRVCC PS to CS request message.

16 . An apparatus of a mobile switching center (MSC) server operable to perform transcoding avoidance, the apparatus comprising:
memory; and one or more processors configured to: decode a single radio voice call continuity (SRVCC) packet switch (PS) to circuit switched (CS) request message received from a mobility management entity (MME); encode a CODEC request message for transmission to an internet protocol (IP) Multimedia Subsystem (IMS); decode a CODEC query response message received from the IMS that includes selected CODEC information for a selected CODEC used for a user equipment (UE) in an IMS over long term evolution (LTE) system; and encode the selected CODEC information for transmission to a target MSC to enable the target MSC to identify the selected CODEC for the UE to allow the selected CODEC to be used in the CS domain.

17 . The apparatus of claim 16 , wherein the one or more processors are further configured to query the IMS for the selected CODEC information in the CODEC request message with identification of the UE.

18 . The apparatus of claim 16 , wherein the one or more processors are further configured to encode the selected CODEC information for transmission to the target MSC and a radio station subsystem/base station system (RNS/BSS) to enable the RNS/BSS to send to an evolved NodeB (eNB) the selected CODEC information included in a radio resource control (RRC) container of the target to source container.

19 . The apparatus of claim 16 , wherein the one or more processors are further configured to encode a prepare handover request for transmission to the target MSC with a priority indication in the SRVCC PS to CS request message.

20 . The apparatus of claim 16 , wherein the one or more processors are further configured to encode the selected CODEC information

Assignees

• Intel Corp

Inventors

• Shan Chang Hong
• Stojanovski Alexandre

Classifications

• H04W36/00226

  wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC] · CPC title

• H04M7/0072

  Speech codec negotiation (H04L65/1069 takes precedence) · CPC title

• H04L65/103

  in the network · CPC title

• H04L65/1016 Primary

  IP multimedia subsystem [IMS] · CPC title

• H04M7/1225

  Details of core network interconnection arrangements · CPC title