Handover of circuit-switched call to packet-switched call, and vice versa

A technology of call switching and packet switching domain, which is applied in the field of wireless communication system and can solve the problems of not supporting PS switching

Inactive Publication Date: 2009-11-04
NOKIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Further, the problem becomes even more challenging considering that currently deployed GERAN networks do not support PS handover

Method used

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  • Handover of circuit-switched call to packet-switched call, and vice versa
  • Handover of circuit-switched call to packet-switched call, and vice versa
  • Handover of circuit-switched call to packet-switched call, and vice versa

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0092] Embodiment 1: Partial HO via Gs interface

[0093] Inter-RAT handover from GERAN to E-UTRAN

[0094] refer to Figure 1A , the signaling path of this embodiment is from BSS 12 to E-UTRAN through MSC 16, SGSN 18 and MME / UPE 20. The signaling steps are as follows:

[0095] 1A. The (serving or source) BSS 12 sets parameters that allow the other domain (E-UTRAN) to determine the actual resources needed to continue an ongoing CS call in the other domain, and sends a request to the other domain's network The element sends an indication of these parameters. The parameters may eg be set based on parameters associated with the GSM codec. Alternatively, default parameters can be used.

[0096] 2A. BSS 12 initiates CS handover to MSC 16 with handover to E-UTRAN indicator. Note that new signaling procedures may be defined for this purpose.

[0097] 3A. The MSC 16 performs signaling to the SGSN 18 over the Gs interface. Note that new signaling procedures may be defined ov...

Embodiment approach 2

[0123] Embodiment 2: Resource allocation request via Gb interface

[0124] Inter-RAT handover from GERAN to E-UTRAN

[0125] refer to Figure 2A , the signaling path for this embodiment is from BSS 12 through SGSN 18 and MME / UPE 20 to E-UTRAN. The signaling steps are as follows:

[0126]1A. The (serving or source) BSS 12 sets parameters that allow the other domain (E-UTRAN) to determine the actual resources needed to continue an ongoing CS call in the other domain. The parameters can eg be set based on parameters associated with the GSM codec, indicating the required VoIP resources in E-UTRAN. Alternatively, default parameters can be used.

[0127] 2A. The BSS 12 uses BSSGP signaling (or other signaling that may be defined) to indicate that resource allocation needs to be prepared for an ongoing CS call in E-UTRAN, thereby sending an indication of these parameters to network elements of another domain.

[0128] 3A. The SGSN 18 performs a "handover"-resource allocation...

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Abstract

The invention discloses a method that includes, during an ongoing call of a wireless user terminal in one of a circuit switched domain or a packet switched domain, initiating a handover procedure; setting parameters allowing the other domain to determine the actual resources needed to continue the call in the other domain, sending an indication of these parameters towards a network element of the other domain and completing the handover procedure. When the ongoing call is in the circuit switched domain completing the handover procedure results in handing over the ongoing call to the packet switched domain, and when the ongoing call is in the packet switched domain completing the handover procedure results in handing over the ongoing call to the circuit switched domain. For example, the circuit switched domain may be a GERAN network and the packet switched domain may be an E-UTRAN (LTE) network. In the GERAN network the handover procedure may be accomplished at least in part through a Gs interface between a mobile switching center and a serving general packet radio system support node and/or through a Gb interface between a base station system and the serving general packet radio system support node. The handover procedure is accomplished at least in part by signaling conducted over an S3 interface between the serving general packet radio system support node of the GERAN network and the mobility management entity of the E-UTRAN network.

Description

technical field [0001] The exemplary and non-limiting embodiments of the present invention relate generally to wireless communication systems, methods, devices, and computer program products, and more particularly, to techniques for performing handover between radio access technologies for a call. Background technique [0002] Various abbreviations appearing in the following description and drawings are defined as follows: [0003] 3GPP Third Generation Partnership Project [0004] BSC base station controller [0005] BSS base station system [0006] BSSGP base station system GPRS protocol [0007] CN core network [0008] CS circuit switching [0009] DRX discontinuous reception [0010] DTM Dual Transmission Mode [0011] DTX discontinuous transmission [0012] EDGE Enhanced Data Rates for GSM Evolution [0013] E-UTRAN Evolved UMTS Terrestrial Radio Access Network [0014] GANC Generic Access Network Controller [0015] GERAN GSM EDGE Radio Access Network [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/14
CPCH04W36/0022H04W36/0083H04W36/12H04W92/24
Inventor V·雷克斯赫皮L·玛里内斯卡G·塞比尔
Owner NOKIA CORP
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