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Call re-establishment via alternative access network

A technology for call re-establishment and access network, applied in the direction of selection device, radio/induction link selection and arrangement, connection management, etc., to achieve the effect of improving user experience

Inactive Publication Date: 2008-03-05
NOKIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] It is possible that GERAN does not order handover or PCCO to UMAN even if UMA cells have been reported

Method used

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  • Call re-establishment via alternative access network
  • Call re-establishment via alternative access network
  • Call re-establishment via alternative access network

Examples

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Embodiment Construction

[0039] In the following, embodiments of the present invention will be described in conjunction with a call re-establishment procedure in a combined UMA and GSM coverage area.

[0040] According to an embodiment, a new option is introduced to recover from a GSM radio link failure in case GSM call re-establishment and GSM to UMA handover is not possible or has not been performed but the MS is already registered with UMA. The basic idea is to allow the MS to also use the UMA cell for call re-establishment if the call re-establishment criteria is enforced and the MS is registered in UMA.

[0041] However, the idea of ​​call re-establishment is not limited to the interweaving between GSM and UMA systems. Systems other than UMA can also be used as the transmission medium for the core network call re-establishment procedure.

[0042] The proposed procedure can be extended to also apply to recovery from packet data transmission failures when (abnormal) cell reselection to another GSM...

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PUM

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Abstract

The present invention relates to a terminal device and method of re-establishing a circuit switched call or a packet switched connection in a data network comprising at least a first access network (e.g. based on GSM, WCDMA, GPRS) and a second access network (e.g. based on UMAN, WLAN, Bluetooth) , wherein a failure of the circuit switched call or the packet switched connection established via the first access network is detected at the terminal device and connection re-establishment is initiated via the second access network in response to the result of checking registration to the second access network, if a failure has been detected. Thereby, a new option is provided to avoid connection failures when coverage to another access network is available, especially where call re-establishment via the first access network is not allowed.

Description

technical field [0001] The invention relates to a method and a terminal device for re-establishing a call in a data network comprising at least a first access network and a second access network, such as for example an Unlicensed Mobile Access Network (UMAN) or a wireless local area network Wireless unlicensed access networks (WLAN), and wireless licensed access networks such as, for example, Global System for Mobile Communications (GSM), Wideband Code Division Multiple Access (WCDMA) or General Packet Radio Service (GPRS) networks. Background technique [0002] Unlicensed Mobile Access (UMA) technologies, including Bluetooth and Wi-Fi, enable access to cellular mobile services, such as those provided on unlicensed spectrum via GSM, WCDMA or GPRS. UMA technology enables seamless transport of mobile voice and data services over unlicensed wireless networks. The same mobile identity is provided on the cellular radio access network and the unlicensed wireless network, so seaml...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04Q7/38H04W76/02
Inventor E·奥伊卡里宁L·达尔斯伽德
Owner NOKIA CORP
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