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

A technology of packet switching network and circuit switching, applied in the field of session transfer, which can solve problems such as errors, improbability, and different use of video calls

Inactive Publication Date: 2017-03-01
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, device and computer program for transferring a session from a packet-switched access network to a circuit-switched access network
  • Method, device and computer program for transferring a session from a packet-switched access network to a circuit-switched access network
  • Method, device 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] reference here figure 2 , 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 service type 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 sessi...

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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. The mobility management entity receives the service type indicator from the gateway node. The service type indicator indicates the service type of the session and is associated with the bearer used for the session. The mobility management entity then receives an indication from the eNodeB that the session is to be transferred from the packet switched network to the circuit switched access network. The mobility management entity uses the service type indicator to determine the bearers associated with the session and uses those bearers to initiate transfer of the session. This ensures that the correct bearer is transferred regardless of whether identifiers such as QCI values ​​have been attributed to other service types.

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 Patents(China)
IPC IPC(8): H04W36/00
CPCH04W36/0022H04W92/24H04W92/045H04L65/1069H04L65/1033H04M15/66H04W8/02H04W88/182
Inventor F.林德霍尔姆R.凯勒
Owner TELEFON AB LM ERICSSON (PUBL)