WO1999034635A2 - Method for improving the handing over a connection from one sgsn to another sgsn - Google Patents

Method for improving the handing over a connection from one sgsn to another sgsn Download PDF

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Publication number
WO1999034635A2
WO1999034635A2 PCT/SE1998/002396 SE9802396W WO9934635A2 WO 1999034635 A2 WO1999034635 A2 WO 1999034635A2 SE 9802396 W SE9802396 W SE 9802396W WO 9934635 A2 WO9934635 A2 WO 9934635A2
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WO
WIPO (PCT)
Prior art keywords
sgsn
connection
new
anchor
temporary
Prior art date
Application number
PCT/SE1998/002396
Other languages
French (fr)
Other versions
WO1999034635A3 (en
Inventor
Knut Bakke
Björn HOLEN
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to AU21936/99A priority Critical patent/AU2193699A/en
Priority to KR1020007007302A priority patent/KR100540353B1/en
Publication of WO1999034635A2 publication Critical patent/WO1999034635A2/en
Publication of WO1999034635A3 publication Critical patent/WO1999034635A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The present invention relates to a method for improving the handing over of a connection from one SGSN (I) to another, i.e. when an MS (Mobile Station) moves from one SGSN service area to another, and for the purpose of not interrupting the packet transmission and possible layer 3 procedures, and for optimizing the network utilization without adding complexity to SGSN, it is according to the invention suggested that at inter SGSN routing update, the old SGSN (I) is given the role as a temporary anchor whereas the other (new) SGSN (II) is temporarily working as a serving SGSN.

Description

METHOD FOR IMPROVING THE HANDING OVER A CONNECTION FROM ONE SGSN TO ANOTHER SGSN
Field of the invention
The present invention relates to a method for improving the handing over of a connection from one SGSN to another, i.e. when an MS (Mobile Station) moves from one SGSN service area to another.
Background of the invention
More specifically the present invention relates to GPRS service on GSM.
When a mobile station (MS) in active GPRS modus, i.e. transmitting information, moves from one SGSN service area to another, the packet transmission and possible layer 3 procedures should not be interrupted.
Due to the complex state machines for the layer 3 procedures, changing SGSN directly implies transmitting very large amounts of control data from one SGSN to another Another problem is ongoing transactions with other network nodes which also has to be redirected to the new SGSN.
State of the art
GSM voice service uses an anchor concept to solve the problem. That means that in the network node (MSC/VLR) a connection is primarily established and is kept throughout the whole call This node is entitled 'anchor MSC/VLR If the subscriber moves into another MSC/VLR' s coverage area, the new MSC/VLR acts only as a transit node This node is entitled 'serving MSC/VLR' whereas the connection control still resides in the anchor MSC/VLR throughout the call.
Problems related to prior art GPRS has no working solution on this problem yet. Due to the long connection times for GPRS (hours) compared to a circuit switched connection (minutes) , a similar solution for GPRS may result in a great number of anchor-serving legs.
Objects of the invention
An object of the present invention is to provide a method for improving the handing over of a connection from one
SGSN to another, whereby the packet transmission and possible layer 3 prosedures are not interrupted.
Another object of the present invention is to provide such a method by which the layer 3 procedures do not have to be designed for supporting inter SGSN routing update.
Still another object of the present invention is to provide a method by which the risk of losing payload packets is minimized.
Yet another object of the present invention is to provide a method by which the tunnelling of payload packets from one SGSN to another is not required, thereby simplifying the design necessary therefor.
Still another object of the present invention is to provide a method which optimizes the network utilization without adding complexity to SGSN.
Another object of the present invention is to provide a method by which the service degration when handing over a connection from one SGSN to another is minimized as experienced from the MS point of view.
Brief disclosure of the invention
In a method as stated in the preamble, the above objects are achieved by the features as stated in the enclosed patent claims.
In other words, the present method suggests that at inter SGSN routing update, the old SGSN gets the role as a temporary anchor whereas the new SGSN works temporarily as a serving SGSN. This leg is kept as long connection control procedure are processing including data packet transmission. When all activities have ceased for the connection, i.e. no data transmission, no layer 3 procedures and no on-going transactions towards other networks nodes, the connection control is moved from anchor to serving SGSN.
The leg between anchor and serving SGSN is a Gb interface with minor modifications. Some control signalling is required to handle radio resources.
Further advantages and features of the present method will appear from the following description taken in conjunction with the appending drawings, as well as from the enclosed patent claims.
Brief disclosure of the drawings
Fig. 1 and Fig. 2 are signalling sequence layouts, illustrating the principle of how inter SGSN routing update is carried out in two steps. Description of embodiments
As explained in the preamble, the present invention re- lates to a method method to "hand over" a connection from one SGSN to another without interrupting packet transmission and control signalling. The method allows the network to create a temporary leg between the old and the new SGSN. The temporary leg prevails until the state of the connection in the anchor SGSN can be securely transferred to the new SGSN while at the same time redirecting packet transfer to go directly from/to SGSN to/from the new SGSN.
With reference to Fig. 1 and Fig. 2 it is illustrated by means of a signalling sequence how the principle of inter SGSN routing update is carried out in two steps.
This construction has the advantage of not impacting on- going layer 3 procedures and any payload transmission. Actually, the layer 3 procedures do not have to be designed to support inter SGSN routing update since the temporary Gb channel is not visible for layer 3. Today's solution in GPRS require that all layer 3 procedures must be designed to cater for an inter SGSN routing update.
Since the context take-over from temp, anchor to new SGSN takes place when the connection has entered a standby state, the risk for loosing payload packets is minimised. And since there is no traffic ongoing, the tunnelling of payload packets from temp, anchor to new SGSN is not required, thereby simplifying the design.
The temp, anchor principle also simplifies signalling to between SGSN and external nodes. Since the solution allows the connection to finish up ongoing transactions before moving the context to new SGSN, services such as charging may be completed towards billing gateway in the normally manner before the context is moved to the new SGSN and charging is resumed.
Merits of invention
The solution optimises the network utilisation without adding complexity to SGSN. The subscriber will not experience any loss of service i.e., no retransmission peer to peer and no interrupted layer 3 procedures.
List of Abbreviations
GPRS - General Packet Radio Service SGSN - Serving GPRS support node GGSN - Gateway GPRS support node MSC/VLR - Mobile Switching Centre/Visitor Location Register

Claims

P a t e n t c l a i m s
1. Method for improving the handing over of a connection from one SGSN (I) to another, i.e. when an MS (Mo- bile Station) moves from one SGSN service area to another, c h a r a c t e r i z e d i n that at inter SGSN routing update, the old SGSN (I) is given the role as a temporary anchor, whereas the other (new) SGSN (II) is tem- porarily working as a serving SGSN.
2. Method as claimed in claim 1, c h a r a c t e r i z e d i n that at said inter SGSN routing update there is created a temporary leg between the old SGSN (I) and the new SGSN (II), said temporary leg being allowed to prevail as long as connection control procedure is upheld, including data packet transmission.
3. Method as claim in claim 1 or 2 , c h a r a c t e r i z e d i n that the temporary leg is allowed to prevail until the state of the connection in the anchor SGSN (I) can be securely transferred to the new SGSN (II) , while at the same time redirecting packet transfer to go directly from/ to SGSN (I) to/ from the new SGSN (II) .
4. Method as claimed in claim 3, c h a r a c t e r i z e d i n that connection control is moved from said anchor SGSN (I) to said serving SGSN (II) when all activities for the connection have ceased, i.e. when no data transmission, no layer 3 procedure and no on-going transactions towards other network nodes prevail .
5. Method as claimed in any of the preceding claims, c h a r a c t e r i z e d i n that the leg between the anchor SGSN (I) and the serving SGSN (II) is created as a Gb interface with minor modifications.
6. Method as claimed in any of the preceding claims, c h a r a c t e r i z e d i n that the inter SGSN routing update is carried out in a two step signalling sequence, and then without impacting on-going layer 3 procedures and any payload transmission, said temporary Gb channel not being visible for said layer 3.
7. Method as claimed in claim 6, c h a r a c t e r i z e d i n that said signalling is carried out between SGSN and external nodes, allowing the connection in question to finish on-going transactions before moving the context to a new SGSN (II), services such as charging being completed towards billing gateway in a normal manner before the context is moved to the new SGSN (II) and charging resumed.
PCT/SE1998/002396 1997-12-30 1998-12-18 Method for improving the handing over a connection from one sgsn to another sgsn WO1999034635A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU21936/99A AU2193699A (en) 1997-12-30 1998-12-18 Method for improving the handing over a connection from one sgsn to another sgsn
KR1020007007302A KR100540353B1 (en) 1997-12-30 1998-12-18 Method for improving the handing over a connection from one sgsn to another sgsn

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO19976150A NO324782B1 (en) 1997-12-30 1997-12-30 Method for improving the transmission of a connection from one SGSN to another SGSN
NO19976150 1997-12-30

Publications (2)

Publication Number Publication Date
WO1999034635A2 true WO1999034635A2 (en) 1999-07-08
WO1999034635A3 WO1999034635A3 (en) 1999-08-19

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PCT/SE1998/002396 WO1999034635A2 (en) 1997-12-30 1998-12-18 Method for improving the handing over a connection from one sgsn to another sgsn

Country Status (5)

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KR (1) KR100540353B1 (en)
AU (1) AU2193699A (en)
NO (1) NO324782B1 (en)
TW (1) TW437242B (en)
WO (1) WO1999034635A2 (en)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000054523A1 (en) * 1999-03-09 2000-09-14 Nokia Networks Oy Ip routing optimization in an access network
WO2000067499A1 (en) * 1999-04-30 2000-11-09 Nokia Networks Oy Sgsn semi anchoring during the inter sgsn srnc relocation procedure
WO2000079808A2 (en) * 1999-06-21 2000-12-28 Telefonaktiebolaget Lm Ericsson (Publ) Method of handing over mobile stations in a general packet radio service (gprs) radio telecommunications network
WO2001005121A1 (en) * 1999-07-08 2001-01-18 Telefonaktiebolaget L M Ericsson (Publ) Technique for providing a secure link in a mobile communication system
EP1128685A1 (en) * 2000-02-22 2001-08-29 Lucent Technologies Inc. Inhibit handover for real-time calls in GPRS systems
WO2002035878A1 (en) * 2000-10-24 2002-05-02 Telefonaktiebolaget Lm Ericsson (Publ) Method and means for providing enhanced subscriber identity confidentiality during roming in a cellular radio communication system
GB2374494A (en) * 2001-04-12 2002-10-16 Ericsson Telefon Ab L M SGSN handover in a GPRS Network
KR20020083942A (en) * 2001-04-26 2002-11-04 가부시키가이샤 엔티티 도코모 Data link transmission control method, mobile communication system, data link transmission control apparatus, base station, mobile station, mobile station control program and computer readable rocording medium
WO2003032672A1 (en) * 2001-10-05 2003-04-17 Telefonaktiebolaget Lm Ericsson Optimization of handover procedures in gprs
KR100399056B1 (en) * 2001-11-21 2003-09-26 한국전자통신연구원 Method of Wireless Communication Resource Allocation by Variable QoS Parameter Negotiation in Wireless Network
WO2003085902A1 (en) * 2002-04-10 2003-10-16 Telefonaktiebolaget Lm Ericsson (Publ) Data preservation
KR100403731B1 (en) * 2000-08-23 2003-10-30 삼성전자주식회사 Core network separation structure an signal processing method thereof in mobile communication system
KR100423148B1 (en) * 2001-11-16 2004-03-16 삼성전자주식회사 A srns relocation method of a packet network one of the asynchronous imt-2000 telecommunication network and the srsn relocation system
WO2005027561A1 (en) * 2003-09-15 2005-03-24 Nokia Corporation Packet-switched handover
US6879820B2 (en) 2000-07-12 2005-04-12 Telefonaktiebolaget Lm Ericsson (Publ) Charging in communication networks having split control planes and user planes
US6973054B2 (en) 2001-01-05 2005-12-06 Telefonaktiebolaget Lm Ericsson (Publ) Communication management in mobile networks having split control planes and user planes
US7103002B2 (en) 2000-07-12 2006-09-05 Telefonktiebolaget Lm Ericsson (Publ) Communication management in networks having split control planes and user planes
CN100420311C (en) * 2002-11-04 2008-09-17 广达电脑股份有限公司 Method for resetting controller of serving wireless network in wireless telecommunication system
CN100444678C (en) * 2002-12-27 2008-12-17 诺基亚西门子网络有限公司 Reallocation of mobile communication network unit
USRE42586E1 (en) 2001-01-09 2011-08-02 Qualcomm Incorporated Method and apparatus for improving radio spectrum usage and decreasing user data delay when providing packet PSI status
US8380211B2 (en) 2005-08-31 2013-02-19 Huawei Technologies Co., Ltd. CS domain call terminating system, method and network device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100798534B1 (en) * 2001-09-11 2008-01-28 에스케이 텔레콤주식회사 Method for providing a pre-paid service in a mobile telecommunication network

Citations (1)

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WO1998059468A2 (en) * 1997-06-24 1998-12-30 Nokia Telecommunications Oy Method and device for re-routing a connection in a connection in a telecommunications network comprising a plurality of network elements

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FI103083B (en) * 1997-01-20 1999-04-15 Nokia Telecommunications Oy Packet radio networks and the procedure for updating the routing area

Patent Citations (1)

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WO1998059468A2 (en) * 1997-06-24 1998-12-30 Nokia Telecommunications Oy Method and device for re-routing a connection in a connection in a telecommunications network comprising a plurality of network elements

Non-Patent Citations (1)

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THE GSM SYSTEM FOR MOBILE COMMUNICATION, M. MOULY et al., 1992, pages 399-412 and 363. *

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000054523A1 (en) * 1999-03-09 2000-09-14 Nokia Networks Oy Ip routing optimization in an access network
US7356595B2 (en) 1999-03-09 2008-04-08 Nokia Corporation IP routing optimization in an access network
US8255540B2 (en) 1999-03-09 2012-08-28 Nokia Corporation IP routing optimization in an access network
WO2000067499A1 (en) * 1999-04-30 2000-11-09 Nokia Networks Oy Sgsn semi anchoring during the inter sgsn srnc relocation procedure
US6909895B2 (en) 1999-04-30 2005-06-21 Nokia Corporation SGSN semi anchoring during the inter SGSN SRNC relocation procedure
WO2000079808A2 (en) * 1999-06-21 2000-12-28 Telefonaktiebolaget Lm Ericsson (Publ) Method of handing over mobile stations in a general packet radio service (gprs) radio telecommunications network
WO2000079808A3 (en) * 1999-06-21 2001-02-15 Ericsson Telefon Ab L M Method of handing over mobile stations in a general packet radio service (gprs) radio telecommunications network
WO2001005121A1 (en) * 1999-07-08 2001-01-18 Telefonaktiebolaget L M Ericsson (Publ) Technique for providing a secure link in a mobile communication system
US6301479B1 (en) 1999-07-08 2001-10-09 Telefonaktiebolaget Lm Ericsson Technique for providing a secure link in a mobile communication system
EP1128685A1 (en) * 2000-02-22 2001-08-29 Lucent Technologies Inc. Inhibit handover for real-time calls in GPRS systems
US6928284B2 (en) 2000-02-22 2005-08-09 Lucent Technologies Inc. Inhibiting handover to a new serving GPRS support node during a real-time call in a telecommunication system
US7103002B2 (en) 2000-07-12 2006-09-05 Telefonktiebolaget Lm Ericsson (Publ) Communication management in networks having split control planes and user planes
US6879820B2 (en) 2000-07-12 2005-04-12 Telefonaktiebolaget Lm Ericsson (Publ) Charging in communication networks having split control planes and user planes
KR100403731B1 (en) * 2000-08-23 2003-10-30 삼성전자주식회사 Core network separation structure an signal processing method thereof in mobile communication system
WO2002035878A1 (en) * 2000-10-24 2002-05-02 Telefonaktiebolaget Lm Ericsson (Publ) Method and means for providing enhanced subscriber identity confidentiality during roming in a cellular radio communication system
US6973054B2 (en) 2001-01-05 2005-12-06 Telefonaktiebolaget Lm Ericsson (Publ) Communication management in mobile networks having split control planes and user planes
USRE42586E1 (en) 2001-01-09 2011-08-02 Qualcomm Incorporated Method and apparatus for improving radio spectrum usage and decreasing user data delay when providing packet PSI status
US8189515B2 (en) 2001-01-09 2012-05-29 Qualcomm Incorporated Method and apparatus for improving radio spectrum usage and decreasing user data delay when providing packet PSI status
GB2374494A (en) * 2001-04-12 2002-10-16 Ericsson Telefon Ab L M SGSN handover in a GPRS Network
KR20020083942A (en) * 2001-04-26 2002-11-04 가부시키가이샤 엔티티 도코모 Data link transmission control method, mobile communication system, data link transmission control apparatus, base station, mobile station, mobile station control program and computer readable rocording medium
WO2003032672A1 (en) * 2001-10-05 2003-04-17 Telefonaktiebolaget Lm Ericsson Optimization of handover procedures in gprs
KR100423148B1 (en) * 2001-11-16 2004-03-16 삼성전자주식회사 A srns relocation method of a packet network one of the asynchronous imt-2000 telecommunication network and the srsn relocation system
KR100399056B1 (en) * 2001-11-21 2003-09-26 한국전자통신연구원 Method of Wireless Communication Resource Allocation by Variable QoS Parameter Negotiation in Wireless Network
US7616607B2 (en) 2002-04-10 2009-11-10 Telefonaktiebolaget L M Ericsson (Publ) Data preservation
WO2003085902A1 (en) * 2002-04-10 2003-10-16 Telefonaktiebolaget Lm Ericsson (Publ) Data preservation
CN100420311C (en) * 2002-11-04 2008-09-17 广达电脑股份有限公司 Method for resetting controller of serving wireless network in wireless telecommunication system
CN100444678C (en) * 2002-12-27 2008-12-17 诺基亚西门子网络有限公司 Reallocation of mobile communication network unit
US8077680B2 (en) 2003-09-15 2011-12-13 Nokia Siemens Networks Oy Packet-switched handover
WO2005027561A1 (en) * 2003-09-15 2005-03-24 Nokia Corporation Packet-switched handover
US8380211B2 (en) 2005-08-31 2013-02-19 Huawei Technologies Co., Ltd. CS domain call terminating system, method and network device

Also Published As

Publication number Publication date
WO1999034635A3 (en) 1999-08-19
NO324782B1 (en) 2007-12-10
NO976150D0 (en) 1997-12-30
KR20010033775A (en) 2001-04-25
TW437242B (en) 2001-05-28
KR100540353B1 (en) 2006-01-10
AU2193699A (en) 1999-07-19
NO976150L (en) 1999-07-01

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