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Srvcc handover of calls between access networks with efficient media gateway selection

A media gateway and access network technology, applied in connection management, electrical components, wireless communication, etc., can solve problems such as inefficient use of resources, different codecs, and voice quality degradation

Active Publication Date: 2014-12-24
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This may result in a different codec being chosen for the session on CS access than the one used on PS access
Hence, there may be voice quality degradation and inefficient use of resources due to the transcoding that must be performed by the MGW after SRVCC handover
[0010] Another problem that accompanies the current procedure is that the MSC server 9 captures the Mobile Media Gateway (M-MGW) it will use for the call

Method used

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  • Srvcc handover of calls between access networks with efficient media gateway selection
  • Srvcc handover of calls between access networks with efficient media gateway selection
  • Srvcc handover of calls between access networks with efficient media gateway selection

Examples

Experimental program
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Embodiment Construction

[0020] refer to figure 2 , which shows the signaling involved in part of the Single Radio Voice Call Continuity (SRVCC) handover procedure of the first embodiment. In this embodiment, an indication of any captured media gateways (MGWs) and optionally also codec information is obtained by the Mobile Switching Center (MSC) server 23 sending an inquiry to the IMS 26 . M-MGW 27 is the MGW that the MSC server will select for CS access. Other entities shown include a User Entity (UE) 20 participating in the call and accessing the IMS 26 via the PS Radio Access Network (RAN), which in this example is an evolved Universal Mobile Telecommunications System (UMTS) Terrestrial RAN (E-UTRAN for short), and is assigned as source E-UTRAN 21 . Mobility management is handled by a source Mobility Management Entity (MME) 22 . Also shown are the target MSC 24 and the target Base Station Server (BSS) 25 in the target CS access network to which the call will be transferred in an SRVCC handover....

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Abstract

A mechanism is presented for performing a session transfer with Single Radio Voice Call Continuity, SRVCC, from a Packet Switched, PS, access to a Circuit Switched, CS, access of a telecommunications session that has been established over the PS access via an IP Multimedia Subsystem, IMS, network. The method includes receiving a request for the transfer of the session to the CS access. An indication of an already- seized media gateway, MGW, that has been established for use in one or more other sessions over the CS access is obtained from the IMS network. A MGW is selected as a Mobile-Media Gateway, M-MGW, for the session based on the obtained indication. Allocation of resources for the session in the CS access network is initiated, including specifying the MGW to be used as the Mobile-Media Gateway, M-MGW. Transfer of the session to the CS access is then initiated.

Description

technical field [0001] The present invention relates to a method and arrangement for improving media gateway (MGW) selection when a call is handed over from a packet switched (PS) access network to a circuit switched (CS) access network in a telecommunications network. More specifically, the present invention relates to handover with Single Radio Voice Call Continuity (SRVCC). Background technique [0002] IP multimedia services provide a dynamic combination of voice, video, messaging, data, etc. within the same session. This has led to an increase in the number of basic applications and media that can be combined, leading to an increase in the number and variety of services offered to end users (so-called "combined IP Multimedia" services). [0003] The IP Multimedia Subsystem (IMS) is a technology defined by the Third Generation Partnership Project (3GPP) for providing Internet Protocol (IP) multimedia services over a mobile communication network. IMS provides key featur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/00H04W76/02
CPCH04W88/16H04W76/16H04W76/10H04W36/00226H04W36/08H04W72/51
Inventor 拉尔夫·凯勒弗雷德里克·林霍尔姆卡里-帕卡·帕图拉卡尔-彼德·兰克
Owner TELEFON AB LM ERICSSON (PUBL)
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