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Handover from circuit switched domain to circuit switched service over packet switched domain

A technology in the circuit switching domain and the packet switching domain, which is applied in the field of handover control mechanisms and can solve problems such as degraded service quality, interruption, and packet loss.

Inactive Publication Date: 2010-03-24
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the current cell or the target cell does not support PS handover, significant disruption may occur as packets will be lost during the transition
Therefore, until all RAN cells support PS handover, using the PS domain to provide IMS services such as voice and video calls may cause users to receive degraded service quality when crossing cell boundaries

Method used

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  • Handover from circuit switched domain to circuit switched service over packet switched domain
  • Handover from circuit switched domain to circuit switched service over packet switched domain
  • Handover from circuit switched domain to circuit switched service over packet switched domain

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Embodiment Construction

[0037] The present invention relates to handover from legacy CS domain (ie 2G and / or 3G RAN) to CSoLTE based solutions. It applies to the following scenarios: when a terminal in CS-dedicated state moves from 2G / 3G RAN to an area where LTE coverage exists and when preferably the call is handed over to the LTE / SAE network.

[0038] This also means that the invention can be applied to CSoLTE-I and CSoLTE-D solutions, since these solutions involve utilizing CSoLTE principles to transport user plane and CS signaling connections.

[0039] The basic concept of the present invention is handover from legacy CS domain to CSoLTE triggered from 2G / 3G RAN. The handover consists of two parallel handover requests, one similar to the CS handover request and the second similar to the existing PS handover request. The CS handover request is also extended with a mechanism for transporting required terminal and PMSC IP-address information.

[0040] The situation handled by the present invention...

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Abstract

A method for initiating handover of a circuit switched service using a circuit switched bearer of a mobile station (31) from a circuit switched to a packet switched domain in a mobile communications network, the mobile communications network comprising a radio network and a core network, the radio network comprising a controlling node (32, 32'), the mobile station being allocated an IP address andaccess port, said method comprising the controlling node communicating to the core network a relocation / handover required message; said relocation / handover required message comprising an indication of the IP address and access port allocated to the mobile station.

Description

technical field [0001] The invention relates to a handover control mechanism for a mobile communication system. In particular, the present invention relates to a method (and apparatus) for triggering a seamless handover of an established connection from a circuit switched domain to a circuit switched service (eg voice over IP call) over a packet switched domain. Background technique [0002] IP Multimedia (IPMM) services provide a dynamic combination of voice, video, messaging, data, etc. within the same session. By increasing the number of basic applications and media that can be combined, the number of services offered to end users will increase and the human-to-human communication experience will be enriched. This will lead to a new generation of personalized, rich multimedia communication services, including so-called "combined IP multimedia" services. [0003] The IP Multimedia Subsystem (IMS) is a technology defined by the Third Generation Partnership Project (3GPP) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/14H04W8/26H04W36/00H04W80/04
CPCH04W80/04H04W8/26H04W36/0022H04W36/00224
Inventor A·珀森M·哈伦斯塔尔G·鲁恩J·T·威克伯格A·威特泽尔
Owner TELEFON AB LM ERICSSON (PUBL)