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Method for controlling an intersystem handover

a technology of intersystems and handovers, applied in the direction of wireless communication services, electrical equipment, wireless communication services, etc., can solve the problem of disadvantageous length and achieve the effect of small loading of signaling channels

Inactive Publication Date: 2012-03-13
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention proposes a method or communication system station that reduces the amount of signaling that occurs during a handover between different systems. This is accomplished by reducing the set of transport format combinations used for transmitting data to a subscriber station, such as a GSM mobile radio system. To enable this method to work effectively, the subscriber stations and network stations need to have a memory region with the corresponding data. This reduces the amount of data that needs to be transmitted, which in turn reduces the loading of the signaling channel."

Problems solved by technology

This length is very disadvantageous because of the only limited capacity available on the usable GSM signal channels.

Method used

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  • Method for controlling an intersystem handover
  • Method for controlling an intersystem handover

Examples

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Embodiment Construction

[0013]Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

[0014]According to the invention, two exemplary cases of a handover can be distinguished for a subscriber station in the region of two radio systems. It is assumed below that the handover is from a GSM to a UMTS mobile radio system, the implementation in the reverse direction also being possible in principle.

[0015]According to a first case, during a connection setup procedure in a GSM mode, a service is requested by the subscriber station which cannot be made available by the GSM system or by a GSM transmission channel (so-called bearer). In this case, the necessity exists for a service-based connection handover from the GSM- to the UMTS mobile radio system.

[0016]In this phase, only a first signaling channel SDCCH (Stand-Alone Dedicated Control Channel) is se...

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Abstract

According to the invention, a reduced set of transport format combinations is signalled to a subscriber station which has established a link to a second radio communication system in a second signalling channel of said second radio communication system. The transport format indicator is then selected from the reduced set of transport format combinations and used to initiate a link transfer to the first signalling channel of a first radio communication system. A full set of transport format combinations is subsequently signalled to the subscriber station in the first signalling channel.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is based on and hereby claims priority to European Application No. 00301815.7 filed on Mar. 6, 2000, the contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a method for the control of an intersystem handover, in particular the handover between a GSM- and a UMTS mobile radio system.[0004]2. Description of the Related Art[0005]Reference is made to the UMTS standardization documents 3GPP: 3G TS 25.212 V3.1.1, 1999-12, Multiplexing and channel coding (FDD), 3GPP: 3G TS 25.222 V3.1.1, 1999-12, Multiplexing and channel coding (TDD), and 3GPP: 3G TS 25.331 V3.1.0, 2000-01, RRC Protocol Specification as the state of the art for the UMTS mobile radio system. For descriptions of the mobile radio system of the second generation GSM, the book by J. Biala, “Mobile Radio and Intelligent Networks”, Vieweg Verlag, is taken as a basis for the gene...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04W36/00H04W4/00H04B7/216H04W36/14
CPCH04W36/0066H04W36/14
Inventor FAERBER, MICHAELISAACS, KENNETHTHOMAS, DAVID WYNNETRAYNARD, JEAN-MICHEL
Owner SIEMENS AG