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Method, apparatuses and computer program for transferring a session from a packet switched access network to a circuit switched access network

A technology of circuit switching and packet switching, which is applied in the direction of telephone communication, electrical components, network data management, etc., and can solve problems such as different use, no way, and error of video calls

Inactive Publication Date: 2013-05-22
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because different applications can be used to stream video, each using QCI=2, and there is no way to know from QCI=2 which bearer is associated with that video call
[0009] Another problem is: the operator may wish to use a QCI value other than 2 for video calls
This would be less likely in the solution described in 3GPP TR 23.886v0.3.1, since detection of a video call would falsely assume that mobile TV video is associated with a video call

Method used

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  • Method, apparatuses and computer program for transferring a session from a packet switched access network to a circuit switched access network
  • Method, apparatuses and computer program for transferring a session from a packet switched access network to a circuit switched access network
  • Method, apparatuses and computer program for transferring a session from a packet switched access network to a circuit switched access network

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Embodiment Construction

[0034] The present invention avoids the problems associated with relying on QCI values ​​to identify service types by providing a service type indicator that can be used for access transfer when transferring sessions. The following description uses an example where the service type is a video call, although it will be appreciated that the invention is applicable to other types of services, such as facsimile or CS data services.

[0035] Referring to FIG. 2 here, when UE1 establishes a session using the LTE network (step S1 ), the Proxy Call Session Control Function (P-CSCF) 6 in the IMS network determines the type of service being used. Note also that step S1 may be performed in case the service type is changed during the session. For example, the same process can be applied when a voice call is escalated to a video call.

[0036] In step S2, the P-CSCF communicates with the Policy Charging and Rules Function (PCRF) 7 to ensure that access resources are established for the sess...

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Abstract

A method and apparatus for transferring a session from a packet switched access network to a circuit switched access network. A Mobility Management Entity receives a service type indicator from a gateway node. The service type indicator indicates a type of service for the session, and is associated with bearers used for the session. The Mobility Management Entity subsequently receives, from an eNodeB, an indication that the session is to be transferred from the packet switched network to the circuit switched access network. The Mobility Management Entity determines the bearers associated with the session using the service type indicator, and initiates transfer of the session using those bearers. This ensures that the correct bearers are transferred regardless of whether or not identifiers such as QCI values have been ascribed to other types of service.

Description

technical field [0001] The invention relates to the field of session transfer in communication networks. Background technique [0002] Long Term Evolution (LTE) is a communication network technology currently under development under the 3rd Generation Partnership Project (3GPP). LTE requires a new radio access technology called the Evolved Universal Terrestrial Radio Access Network (E-UTRAN), which is designed to improve network capacity, reduce latency in the network and thus improve the end user's experience. System Architecture Evolution (SAE) is the core network architecture for LTE communication networks. [0003] LTE uses only Packet Switched (PS) signaling. When a network operator wishes to introduce LTE, he will not be able to operate a full LTE service from day one. LTE will need to be rolled out gradually to replace existing technologies. In order to do this, the LTE network must have some way of interfacing with networks using other technologies, such as Circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/00
CPCH04W92/24H04W92/045H04W36/0022H04W36/00226H04L65/1069H04L65/1033H04M15/66H04W8/02H04W88/182
Inventor F.林德霍尔姆R.凯勒
Owner TELEFON AB LM ERICSSON (PUBL)