WO2002098154A1 - Connexion d'un sous systeme de station de base gsm a un rnc d'un systeme umts de façon a prendre en charge l'interface iu d'un sous systeme de station de base gsm - Google Patents

Connexion d'un sous systeme de station de base gsm a un rnc d'un systeme umts de façon a prendre en charge l'interface iu d'un sous systeme de station de base gsm Download PDF

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Publication number
WO2002098154A1
WO2002098154A1 PCT/SE2002/001026 SE0201026W WO02098154A1 WO 2002098154 A1 WO2002098154 A1 WO 2002098154A1 SE 0201026 W SE0201026 W SE 0201026W WO 02098154 A1 WO02098154 A1 WO 02098154A1
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WO
WIPO (PCT)
Prior art keywords
base station
interface
controller
mobile radio
radio network
Prior art date
Application number
PCT/SE2002/001026
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English (en)
Inventor
Alan Leddy
William Warrillow
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)
Publication of WO2002098154A1 publication Critical patent/WO2002098154A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/22—Interfaces between hierarchically similar devices between access point controllers

Definitions

  • the present invention relates generally to the field of mobile radio communications, and more particularly to a method and apparatus for improving the network architecture of a mobile radio system.
  • the mobile radio communications technology is continuously evolving. At the same time as new standards are being developed, improvements are made within already existing standards. Many operators of mobile radio networks rely on their mobile radio networks of an already existing standard, while investments are being made in mobile radio networks of a new standard. It is desirable that, where possible, the functionality of the existing standard is evolved to incorporate some of the functionality of the new standard.
  • the GSM Global System for Mobile communication
  • UMTS Universal Mobile Telecommunication Standard
  • GSM Global System for Mobile Communications
  • UMTS Universal Mobile Telephony System
  • GSM/EDGE Radio Access Network GSM/EDGE Radio Access Network
  • Iu for communication between the GSM base station subsystem and the core network
  • the functionality of GSM can be extended.
  • An example of functionality which could be supported by GSM when the Iu interface is introduced as an interface between the GSM base station subsystem and the core network is real-time processing of data calls.
  • a problem to which one aspect of the present invention relates is how to improve the network architecture of a mobile radio system.
  • a mobile radio system comprising at least a first mobile radio network which has a core network and a base station subsystem.
  • the base station subsystem comprises a base transceiver station and a base station controller, the base station controller being connected to the core network.
  • the base station subsystem further comprises a further node, which is connected to the core network.
  • the further node is capable of passing traffic to/from the core network over a first interface.
  • the base station controller and the further node are connected to each other via a connection, over which connection traffic can be passed by use of a second interface.
  • traffic can be passed to/from the base station subsystem from/to the core network via the first interface.
  • the further node is a second base station controller, designed for operation according to a standard of mobile radio telephony different to the standard according to which said first mobile radio network is operated.
  • a standard of mobile radio telephony different to the standard according to which said first mobile radio network is operated.
  • development costs can be kept low.
  • migration of subscribers from the standard used by the first mobile radio network to the standard according to which the second base station controller is designed to operate is facilitated.
  • the standard according to which the first mobile radio network is operating could e.g. be the GSM standard
  • the second base station controller could e.g. be a radio network controller designed for operation according to the UMTS standard.
  • the first interface could then be the Iu interface.
  • At least one protocol of the first interface is terminated, on the base station subsystem side of the first interface, at the further node.
  • the ATM protocol could be terminated at the radio network controller.
  • the second interface is based on the ethernet protocol.
  • the OSE delta signalling process internal to the OSE Delta operating system, could then be used on top of the ethernet protocol, or another protocol could be used on top of ehternet.
  • the protocol stack used on the second interface could comprise the El protocol, the PPP protocol and the IP protocol.
  • the further node could be part of a second base station subsystem of a second mobile radio network.
  • the further node would then be connected to at least one radio transceiver station.
  • said connection could be further used for information exchange between the base station subsystem of the first mobile radio network and the second base station subsystem.
  • traffic management could be improved.
  • said information exchange uses said second interface.
  • the base station controller of the first network and the further node are physically co-located.
  • said connection is short and fast.
  • Information exchange can hence be made efficient.
  • the problem to which the present invention relates is further addressed by a base station subsystem operable in a GSM mobile radio network.
  • the base station subsystem comprises at least one radio transceiver station and a base station controller connected to a core network.
  • the base station controller is capable of passing traffic to/from the core network over the A and Gb interfaces.
  • the base station subsystem further comprises a radio network controller, connected to said core network, capable of passing traffic to/from the core network via the Iu interface.
  • the base station controller and the radio network controller are connected via a connection over which traffic, intended for Iu interface communication between a mobile station and the core network, can be passed.
  • the inventive base station subsystem is achieved that traffic intended for the Iu interface can be passed between the core network and a GSM mobile station, via the GSM base station subsystem.
  • the problem is further met by a method of providing support for Iu interface communication to/from a MS in a GSM mobile radio network.
  • the GSM mobile radio network comprises at least one base station subsystem and a core network.
  • the base station subsystem comprises at least one radio transceiver station and a base station controller.
  • the base station controller is connected to the core network and is capable of traffic transmission to/from the core network over the A and Gb interfaces.
  • the GSM base station subsystem enables mobile stations to communicate in a certain area.
  • the method comprises the steps of connecting a radio network controller to the base station controller, enabling traffic transmission between the radio network controller and the base station controller over an interface and transmitting traffic to/from a mobile station, communicating with the core network, over the connection between the base station controller and the radio network controller when said traffic to/from a mobile station is intended for Iu communication.
  • the radio network controller is further connected to the core network and is capable of traffic transmission to/from the core network over the Iu interface.
  • Fig. 1 is a schematic overview of a mobile radio network.
  • Fig. 2 is a schematic overview of a mobile radio system comprising an example of the inventive GERAN base station subsystem.
  • Fig. 3 a is an example of a protocol stack used for traffic transmission over an interface between a base station controller and a radio network controller.
  • Fig. 3b is an alternative protocol stack which could be used for traffic transmission between a base station controller and a radio network controller. Detailed description
  • FIG. 1 The general architecture of a mobile radio network 100 is schematically illustrated in Fig. 1.
  • Mobile radio network 100 provides radio communication to users of Mobile Stations (MS).
  • MS 105 is shown to communicate within the mobile radio network 100 via a Base Transceiver Station (BTS) 110 using a radio link 115.
  • BTS Base Transceiver Station
  • BSC Base Station Controller
  • the BTSs 110 and the BSC 120 forms what is referred to as the base station subsystem 125.
  • the BSC 120 is in turn connected to a core network 130, which controls calls to and from other networks such as Public Switched Telephony Networks (PSTN), Integrated Services Digital Networks (ISDN), other Public Land Mobile Networks (PLMNs), the internet etc.
  • PSTN Public Switched Telephony Networks
  • ISDN Integrated Services Digital Networks
  • PLMNs Public Land Mobile Networks
  • the BSC 120 communicates with the core network 130 via the nodes MSC (Mobile services Switching Centre) 135 and SGSN (Switching General packet radio services Support Node) 140.
  • the MSC 135 is responsible for switching circuit switched connections, while the SGSN 140 is used for switching packet switched connections.
  • the communication protocol used within GSM for communication over the connection 145 between the BSC 120 and the MSC 135 is referred to as the A-interface, while the communication protocol used over the connection 150 between the BSC 120 and the SGSN 140 is referred to as the Gb-interface (see e.g. GSM TS 03.02 and GSM TS 03.60 for further information on these interfaces).
  • Fig. 1 Depending on which standard is used for communication in mobile radio network 100, the functionality, implementation and name of the nodes shown in Fig. 1 may vary.
  • the terminology used in Fig. 1 is the terminology of a mobile radio network operating according to the GSM standard. However, similar nodes would be found in mobile radio networks of other standard.
  • the base transceiver station and the base station controller are referred to as the Node B and the radio network controller, respectively.
  • the network architecture of the GSM standard is further described in GSM TS 03.02 and GSM TS 03.60.
  • the network architecture of the UMTS standard is described in 3 rd Generation Partnership Project TS 23.002.
  • the Iu interface has previously been defined for communication in the UMTS standard, see 3 rd Generation Partnership Project TS 25.410.
  • the Iu interface is used for communication between the UMTS base station controller (radio network controller) and the core network 130.
  • a GSM base station subsystem 125 with the capability of communicating over the Iu interface, is referred to as a GERAN base station subsystem.
  • the Iu interface consists of two parts: the lu-cs for circuit switched communication with the MSC 135 and the lu-ps for packet switched communication with the SGSN 140.
  • the GERAN base station subsystem should support the traditional GSM interfaces, A and Gb, as well as the Iu interface.
  • the Iu interface is based on the ATM protocol.
  • the GSM base station subsystem 125 shown in Fig. 1, is not standardised to support ATM communication.
  • a solution to the problem of how to extend the functionality of the GSM base station subsystem 125 in order to provide support for Iu interface communication is presented in Fig. 2.
  • An inventive GERAN base station subsystem 200 is shown in Fig. 2, in which the BSC 120 is connected to a UMTS base station controller 205 via a connection 210.
  • the UMTS base station controller 205 will in the following be referred to as the RNC (Radio Network Controller) 205.
  • a new interface in the following referred to as the X interface, is introduced for traffic transmission between the BSC 120 and the RNC 205 over the connection 210. Traffic transmitted over connection 210 could e.g. be control signalling, and/or user data, relating to end user calls or data sessions.
  • MS 105 of Fig. 2 can be a mobile station operable in A/Gb-mode, or MS 105 can be a mobile station operable in Iu mode.
  • the traffic to/from the MS 105 is intended for the A or Gb interface, while the traffic to/from the MS 105 is intended for the Iu interface when the MS 105 is operating in the Iu mode.
  • Traffic intended for A/Gb-interface communication can be transmitted to/from the BSC 120 from/to the core network 130 over the connections 145 or 150, while traffic intended for Iu interface communication, can be transmitted to/from the BSC 120 from/to the RNC 205 over the connection 210, using the new X interface.
  • the RNC 205 which supports ATM communication, can in turn transmit/receive the traffic to/from the MSC 135 or the SGSN 140 over connections 215 or 220, using the lu-cs or the lu-ps, respectively.
  • logic can be introduced for distinguishing between MS originated traffic intended for the Iu interface, which should be transmitted on connection 210 using the X interface, and MS originated traffic intended for the A/Gb interface, which should be transmitted on connections 145 or 150 using the A interface or the Gb interface, respectively.
  • a first advantage is that no support for the ATM protocol has to be introduced in the base station controller 120, since the ATM protocol of the Iu interface can be terminated at the RNC 205.
  • Another major advantage is that equipment already developed can be re-used in a new environment, keeping development costs and development times low.
  • Yet another great advantage is that the migration of subscribers from a GSM network to a UMTS network, owned by the same operator, will be facilitated.
  • a connection between the BSC 120 and an RNC 205 is used to facilitate an Iu based traffic transmission between the GERAN base station subsystem 200 and the core network 130.
  • the RNC 205 is co-located with the BSC 120.
  • the connection 210 will then be a short and fast connection.
  • the new interface X could e.g. use ethernet as the layer 1 and 2 interface protocol.
  • An example of a protocol stack which could be used on the interface X is shown in Fig. 3a.
  • a signalling protocol internal to the operating system OSE delta is used on top of ethernet to support the relay transfer function. This signalling protocol is referred to as the OSE Delta signalling process.
  • any application in the BSC 120 or the RNC 205 could avail of the relay transfer function to communicate with a peer application the RNC 205 or the BSC 120, respectively.
  • Other protocols could alternatively be used on top of ethernet in this embodiment.
  • the BSC 120 and the RNC 205 are not co-located. If the BSC 120 and the RNC 205 are located far apart, it would be preferable to use another protocol stack than the protocol stack shown in Fig. 3a, since ethernet is not efficient on large distances.
  • the protocol stack used for communication on the X interface could then e.g. be the protocol stack shown in Fig. 3b.
  • the El protocol defined in ITU-T specifications G.703 and G.704, is used as the physical layer in the exemplary protocol stack shown in Fig. 3b, with a Point to Point Protocol (PPP) supporting the layer 2 transport.
  • IP Internet Protocol
  • UDP User Diagram Protocol
  • Some or all of the protocols in the protocol stack in Fig. 3b could be exchanged for other protocols.
  • the frame relay protocol could e.g. be used instead of the PPP protocol.
  • the protocol stack shown in Fig. 3b could be used regardless of the size of the distance between the BSC 120 and the RNC 205.
  • the RNC 205 is shown to support a base transceiver station 225, the base transceiver station 225 being a Node B designed for communication in a UMTS network.
  • a UMTS base station subsystem 240 of the UMTS network comprises the RNC 205 and the base transceiver station 225.
  • a MS 230 is shown to communicate in the UMTS network over a radio link 235, based on the UMTS air interface.
  • the RNC 205 is logically a part of the GERAN base station subsystem 200, as well as a node in a UMTS base station subsystem 240.
  • connection 210 could further be used for signalling between the GERAN base station subsystem 200 and the UMTS base station subsystem 240.
  • An information exchange application in the BSC 120 and the RNC 205 could then use the relay transfer function of interface X, of which examples are given in Fig. 3.
  • the RNSAP (Radio Network Application Part) protocol defined in 3 rd Generation Partnership Project TS 25.423, could be used to support the information exchange.
  • An example of information which could be transmitted over the connection 210 is information regarding the respective loads in the GERAN base station subsystem 200 and the UMTS base station subsystem 240. This information could then e.g. be used by the RNC 205 and the BSC 120 in making hand-over decisions for MSs 105/230 capable of transmitting over both the GSM radio link 115 and the UMTS radio link 235.

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  • Mobile Radio Communication Systems (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)

Abstract

La présente invention concerne un procédé et un appareil destinés à améliorer l'architecture de réseau d'un système radio mobile. Dans un mode de réalisation de l'invention, le contrôleur de la station de base d'un sous système de station de base GSM est connecté à un contrôleur de réseau radio de façon à prendre en charge l'interface Iu du sous système de la station de base GSM.
PCT/SE2002/001026 2001-05-30 2002-05-29 Connexion d'un sous systeme de station de base gsm a un rnc d'un systeme umts de façon a prendre en charge l'interface iu d'un sous systeme de station de base gsm WO2002098154A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0101892A SE0101892D0 (sv) 2001-05-30 2001-05-30 Mobil radio system and a method relating to mobile radio communication
SE0101892-8 2001-05-30

Publications (1)

Publication Number Publication Date
WO2002098154A1 true WO2002098154A1 (fr) 2002-12-05

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WO (1) WO2002098154A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1530381A2 (fr) * 2003-11-07 2005-05-11 NTT DoCoMo, Inc. Méthode pour améliorer le routage des paquets dans un réseau coeur UMTS
US7860505B2 (en) * 2003-06-05 2010-12-28 Ntt Docomo, Inc. Mobile communication system, extension transmission/reception server, extension transmission/reception controller, base station, radio network controller, mobile station and communication method
EP2375803A1 (fr) 2010-03-29 2011-10-12 Vodafone Group PLC Entité de contrôleur de réseau d'accès radio multi-mode avec reconfiguration dynamique pour soutenir au moins deux technologies d'acces radio différentes

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000074411A1 (fr) * 1999-05-31 2000-12-07 Nokia Corporation Procede de transmission et d'interconnexion
WO2001013580A1 (fr) * 1999-08-18 2001-02-22 Alcatel Transmission de donnees entre un premier centre de connexion des services mobiles d'un premier systeme mobile de radiocommunication et un second centre de connexion des services mobiles d'un second systeme mobile de radiocommunication

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000074411A1 (fr) * 1999-05-31 2000-12-07 Nokia Corporation Procede de transmission et d'interconnexion
WO2001013580A1 (fr) * 1999-08-18 2001-02-22 Alcatel Transmission de donnees entre un premier centre de connexion des services mobiles d'un premier systeme mobile de radiocommunication et un second centre de connexion des services mobiles d'un second systeme mobile de radiocommunication

Non-Patent Citations (1)

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Title
DIAS P. ET AL.: "The Rainbow concept for a generic UMTS networks architecture", VEHICULAR TECHNOLOGY CONFERENCE, 1999. VTC 1999 - FALL. IEEE VTS 50TH, vol. 2, 1999, pages 1018 - 1022 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7860505B2 (en) * 2003-06-05 2010-12-28 Ntt Docomo, Inc. Mobile communication system, extension transmission/reception server, extension transmission/reception controller, base station, radio network controller, mobile station and communication method
EP1530381A2 (fr) * 2003-11-07 2005-05-11 NTT DoCoMo, Inc. Méthode pour améliorer le routage des paquets dans un réseau coeur UMTS
EP1530381A3 (fr) * 2003-11-07 2006-07-05 NTT DoCoMo, Inc. Méthode pour améliorer le routage des paquets dans un réseau coeur UMTS
US7634293B2 (en) 2003-11-07 2009-12-15 Ntt Docomo, Inc. Mobile communication system, extension transmission/reception device, base station, radio network controller and mobile station
EP2375803A1 (fr) 2010-03-29 2011-10-12 Vodafone Group PLC Entité de contrôleur de réseau d'accès radio multi-mode avec reconfiguration dynamique pour soutenir au moins deux technologies d'acces radio différentes

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Publication number Publication date
SE0101892D0 (sv) 2001-05-30

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