EP1527638A2 - Method for setting up a connection between a radio network controller and a media gateway - Google Patents

Method for setting up a connection between a radio network controller and a media gateway

Info

Publication number
EP1527638A2
EP1527638A2 EP03787762A EP03787762A EP1527638A2 EP 1527638 A2 EP1527638 A2 EP 1527638A2 EP 03787762 A EP03787762 A EP 03787762A EP 03787762 A EP03787762 A EP 03787762A EP 1527638 A2 EP1527638 A2 EP 1527638A2
Authority
EP
European Patent Office
Prior art keywords
media gateway
network controller
radio network
identification
payload
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP03787762A
Other languages
German (de)
French (fr)
Inventor
Martin Stümpert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to EP03787762A priority Critical patent/EP1527638A2/en
Publication of EP1527638A2 publication Critical patent/EP1527638A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/02—Inter-networking arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/14—Interfaces between hierarchically different network devices between access point controllers and backbone network device

Abstract

The invention relates to methods for setting up a payload connection in a core network between a radio network controller and a media gateway. It introduces a new protocol for transporting an IP address from a media gateway to a radio network controller.

Description

Method for setting up a connection
[technical field]
The present invention relates to methods for setting up a payload connection in a core network between a radio network controller and a media gateway. lu on IP (Internet Protocol) is being standardised in 3GPP (3 rd Generation Partnership Project) R5 (Release5) to be finalized by June 2002, see Technical Report TR 25.933. The exchange of the IP addresses on lu cs and the ATM - IP interworking is discussed, but still not decided. The exchange of IP address is now agreed on, but the solution is violating the transport independence of call control in the split architecture.
Also the chosen solution for the IP address exchange is very costly to implement in MSC (mobile services switching centre) /MGW (media gateway).
Three ways for exchanging an IP address were discussed in May 2002 at the 3GPP N4 committee as described in the document N4-020568. The first solution is based on sending an IP address of a radio network controller in an INIT message from the radio network controller via a mobile services switching centre to a media gateway. The media gateway returns its IP address to the radio network controller in an INIT ACK message, a shortcoming of this solution is that INIT and INIT ACK messages are not sent when the core network operates in a transparent mode.
In the second solution it is proposed to introduce a kind of ALCAP (Access Link Control Application Part) alike the one described in ITU standards Q.2630.1 and Q.2630.2. The IP address of a radio network controller then should be included in an establish request address sent by the radio network controller to the media gateway. However, the proposal does not disclose the adaptation of ALCAP for the intended use.
The third solution is based on a modification of existing RANAP (Radio Access Network Application Protocol) radio access bearer assignment request message. One suggestion to implement the transport of IP addresses has been the use of IPBCP (bearer independent call control IP Bearer Control Protocol) as introduced into core network in 3GPP R4 for IP transmission. However, IPBCP cannot be used. IPBCP, as defined in the ITU standards Q.2630 does not include routing functionality. IPBCP relies on signalling tunnels setup over Mc interface between media gateway and mobile services switching centre and Mb interface between mobile services switching centres.
Therefore, it is an object of the invention to introduce a way for exchanging internet addresses on the lu interface of circuit switched core networks.
Another object of the invention is to support the usage of network nodes that are transmitting according to ATM or IP protocols.
[summary of the invention]
This will be solved advantageously by the methods of claims 1, 3, 4, 5, and 6 the media gateway of claim 7 and the radio network controller of claim 8.
The invention introduces a method for establishing a payload connection between a radio network controller and a media gateway of a cellular mobile communications network, wherein the media gateway sends and receives payload according to internet protocols. The method comprises the following steps, sending from a mobile services switching centre to the radio network controller a radio access bearer assignment request message comprising an internet protocol address of the media gateway and a binding identification, processing the radio access bearer assignment request message in the radio network controller and selecting appropriate resources for the connection, sending from the radio network controller to the media gateway an establish request message comprising an internet protocol address of the radio network controller and an identification of a radio network controller port to be used for the payload connection, receiving in the media gateway the establish request message, processing the establish request message in the media gateway, and returning an establish confirm message comprising an internet protocol address of the media gateway and an identification of a media gateway port to be used for the payload connection.
In an embodiment of the invented method, a connection between the media gateway and the radio network controller is set up according to a bearer independent call control internet protocol bearer control protocol, for example according to the ITU (International Telecommunication Unit) recommendation ITU-T Q.1970 of July 2001, that is transported on the interface between the media gateway and the radio network controller by means of a bearer independent call control bearer control tunnelling protocol, for example according to the ITU-T recommendation Q.1990 of July 2001, that is transported on said interface according to a third generation partnership project technical specification 29.205 version 4.2.0. The use of the bearer independent call control bearer control tunnelling protocol, for example according to the ITU-T recommendation Q.1990 is optional but reduces the impact on the other protocols.
The invention further introduces a method for a media gateway for establishing a payload connection to a radio network controller, wherein the media gateway sends and receives payload according to internet protocols. The method comprises the following steps, receiving from the radio network controller an establish request message comprising an internet protocol address of the radio network controller and an identification of a radio network controller port to be used for the payload connection, processing the establish request message in the media gateway, and returning an establish confirm message comprising an internet protocol address of the media gateway and an identification of a media gateway port to be used for the payload connection.
Also introduced by the invention is a method for a radio network controller for establishing a payload connection according to internet protocol to a media gateway for sending and receiving payload according to internet protocols. The method comprises the following steps, receiving from the mobile services switching centre a radio access bearer assignment request message comprising an internet protocol address of the media gateway and a binding identification, processing the radio access bearer assignment request message in the radio network controller, sending to the media gateway an establish request message comprising an internet protocol address of the radio network controller and an identification of a radio network controller port to be used for the payload connection, and receiving an establish confirm message comprising an internet protocol address of the media gateway and an identification of a media gateway port to be used for the payload connection.
Furthermore the invention introduces a method for setting up a payload connection between a radio network controller and a media gateway wherein a choice is made between a first transmission technology according to asynchronous transfer mode standards and a second transmission technology according to internet protocol standards. The method is executed by a mobile services switching centre that comprises a storage for storing an identification of a radio network controller, an indication whether a radio network controller supports the first transmission technology, an indication whether a radio network controller supports the second transmission technology, an identification of a media gateway, an indication whether a media gateway supports the first transmission technology, an indication whether a media gateway supports the second transmission technology. The method comprises the steps of, selecting a radio network controller for a connection, determining the transmission technology supported by the selected radio network controller, selecting a media gateway that supports the same transmission technology.
Furthermore the invention introduces a method for selecting a media gateway in a radio network controller wherein the media gateway comprises a storage comprising an identification of a media gateways, an indication whether a media gateway supports the transmission of payload according to asynchronous transfer mode protocols, an indication whether a media gateway supports the transmission of payload according to internet protocols, and an address for contacting a media gateway according to the respective transmission technology. The method comprises the steps of, receiving an identification of a selected media gateway, looking up which transmission technologies are supported by the media gateway, selecting a transmission technology that is supported by the media gateway, retrieving from the storage the respective address allocated to the selected media gateway for the selected transmission technology.
The invention introduces a media gateway for sending and receiving payload according to internet protocols, comprising means for receiving from the radio network controller an establish request message comprising an internet protocol address of the radio network controller and an identification of a radio network controller port to be used for the payload connection, means for processing the establish request message in the media gateway, and means for returning an establish confirm message comprising an internet protocol address of the media gateway and an identification of a media gateway port to be used for the payload connection.
The invention further introduces a radio network controller for establishing a payload connection according to internet protocols to a media gateway for sending and receiving payload according to internet protocols, comprising means for receiving from a mobile services switching centre a radio access bearer assignment request message comprising an internet protocol address of the media gateway and a binding identification, means for processing the radio access bearer assignment request message in the radio network controller, means for sending to the media gateway an establish request message comprising an internet protocol address of the radio network controller and an identification of a radio network controller port to be used for the payload connection, and means for receiving an establish confirm message comprising an internet protocol address of the media gateway and an identification of a media gateway port to be used for the payload connection.
[brief description of the drawings]
The following figures show:
Fig. 1 depicts a simplified protocol stack as state of the art, Fig. 2 depicts a protocol as introduced by the invention, and Fig. 3 depicts a section of a core network [detailed description]
In the following the invention will be further described by means of examples and by means of figures.
Fig. 1 depicts a simplified protocol stack as state of the art. Depicted are a core network CN, connected to a radio access network UTRAN via a first interface lu and a user equipment UE, connected to the radio access network UTRAN via a Uu interface. In the access stratum, for the lu interface the transport layer protocols are summarised as User plane Data Bearers protocols. Above said protocols the user plane protocols are depicted as lu UP. In the radio access network UTRAN, the protocols are transformed to the radio protocols that are used on the Uu interface. The lu user plane is received from the non access stratum as non-access stratum data streams NAS Data Streams. It is transported via the core network CN over the lu interface and the Uu interface to the user equipment UE and in the user equipment UE via the radio protocols to the non-access stratum.
Figure 2 depicts a protocol as introduced by the invention comprising a first message ERQ that is sent from a radio network controller RNC to a media gateway MGW. Said first message ERQ comprising an IP address RNC-UP-IP of the radio network controller RNC and an identification RNC-port of a radio network controller resource to be used for a transmission of user plane. The media gateway MGW replies with a second message ECF comprising an IP address MGW-UP-IP of the media gateway MGW and an identification MGW-port of a media gateway resource to be used for the transmission of user plane. The protocol further comprises a third message INIT sent from the radio network controller RNC to the media gateway MGW for initialising the user plane. A forth message INIT ACK is sent from the media gateway MGW to acknowledge the initialisation. Furthermore, the protocol may comprise message for releasing resources after a transmission is finished. To that end a fifth message can be sent from the radio network controller RNC to the media gateway MGW indicating a release request. Said fifth message may be acknowledged by a sixth message indicating a release confirm, in an embodiment of the invention the first message ERQ is sent after the reception of a RAB (Radio Access Bearer) assignment request message for the connection at the radio network controller RNC from a mobile services switching centre MSC Server. In said embodiment a message RAB assignment response is returned by the radio network controller RNC to the mobile services switching centre MSC Server after sending the forth message INIT ACK. After returning said message RAB assignment response, user payload Data transfer is sent.
Figure 3 depicts a section of a core network comprising a first call control node CC1 and a second call control node CC2 both call control nodes are connected with each other via a signalling link for signals according to a Bearer Independent Call Control BICC standard. The second call control node CC2 is connected to an external network EN by a signalling connection for signals according to an integrated services digital network user part standard. The external network is for instance Public Switched Telecommunications Network, a network operating according to an integrated services digital network, or a public land mobile network. The external network EN is further connected to a first media gateway MGWl . The first media gateway MGWl is adapted to transmit and receive user payload according to an asynchronous transfer mode standard ATM from the external network EN and a first radio network controller RCN1. The depicted section further comprises a second media gateway MGW2 adapted to transmit and receive user payload according to an internet protocol standard IP from the external network EN and a second radio network controller RCN2. The first call control node CC1 is connected to the media gateways MGWl and MGW2 for signalling e.g. according to an ITU-T H.248 standard. It is furthermore connected to the radio network controllers RNCl and RNC2 for signalling according to a radio access network application protocol RANAP.
In an embodiment of the invention the first call control node CC1 comprises a storage wherein information is stored that the first radio network controller RNCl is operating according to an asynchronous transfer mode and that the second radio network controller RNC2 is operating according to an internet protocol. In the case that a payload connection according to an asynchronous transfer mode has to be set up, the first core network node CC1 selects the first radio network controller RNCl for said connection. In the case that a connection according to an internet protocol has to be set up, the first core network node CC1 will select the second radio network controller RNC2. In general the core network node comprises information which radio network controller operates according to which transmission technology, i.e. asynchronous transfer mode or internet protocol, and selects the appropriate radio network controller for a connection. Furthermore the core network node stores information about media gateway and the transmission technology supported by said media gateways and selects the appropriate media gateway for a radio network controller and vice versa.
In a further embodiment of the invention, a radio network controller can operate according to a plurality of transmission technologies. Said radio network controller stores information about the supported transmission technology or transmission technologies for each media gateway it can be connected to. The radio network controller the selects a media gateway according to the type of address received from a call control node e.g. in a radio access bearer assignment request message. In a further embodiment of the invention, a real transport independent address is used on a gateway control protocol and radio access network application protocol like a subscriber number, e.g. according to a ITU-T standard E.164, as it is used for connections according to a asynchronous transfer mode standard. When core network node receives a bearer address from a media gateway, it provides it to the radio network controller. The radio network controller comprises a table for mapping the bearer independent media gateway address to the transmission technology and getting a routable address.
This requires, that the core network node and the media gateway have implemented dual stack for asynchronous transfer mode and for internet protocol, i.e. they are adapted to support both transmission technologies. Alternatively, the radio network controller can have a dual stack to support asynchronous transfer mode as well as internet protocol and the core network transmission capabilities implemented.

Claims

Claims
1. Method for establishing a payload connection between a radio network controller and a media gateway of a cellular mobile communications network, wherein the media gateway sends and receives payload according to internet protocols, said method comprising the following steps: sending from a mobile services switching centre to the radio network controller a radio access bearer assignment request message comprising an internet protocol address of the media gateway and a binding identification,
- processing the radio access bearer assignment request message in the radio network controller and selecting appropriate resources for the connection, sending from the radio network controller to the media gateway an establish request message comprising an internet protocol address of the radio network controller and an identification of a radio network controller port to be used for the payload connection, receiving in the media gateway the establish request message, processing the establish request message in the media gateway, and returning an establish confirm message comprising an internet protocol address of the media gateway and an identification of a media gateway port to be used for the payload connection.
2. Method according to claim 1, wherein a connection between the media gateway and the radio network controller is set up according to a bearer independent call control internet protocol bearer control protocol that is transported on the interface between the media gateway and the radio network controller by means of a bearer independent call control bearer control tunnelling protocol that is transported on said interface according to a third generation partnership project technical specification 29.205 version 4.2.0.
3. Method for a media gateway for establishing a payload connection to a radio network controller, wherein the media gateway sends and receives payload according to internet protocols, said method comprising the following steps: receiving from the radio network controller an establish request message comprising an internet protocol address of the radio network controller and an identification of a radio network controller port to be used for the payload connection, processing the establish request message in the media gateway, and returning an establish confirm message comprising an internet protocol address of the media gateway and an identification of a media gateway port to be used for the payload connection.
4. Method for a radio network controller for establishing a payload connection according to internet protocol to a media gateway for sending and receiving payload according to internet protocols, said method comprising the following steps: - receiving from the mobile services switching centre a radio access bearer assignment request message comprising an internet protocol address of the media gateway and a binding identification, processing the radio access bearer assignment request message in the radio network controller, - sending to the media gateway an establish request message comprising an internet protocol address of the radio network controller and an identification of a radio network controller port to be used for the payload connection, and - receiving an establish confirm message comprising an internet protocol address of the media gateway and an identification of a media gateway port to be used for the payload connection.
5. Method for setting up a payload connection between a radio network controller and a media gateway wherein a choice is made between a first transmission technology according to asynchronous transfer mode standards and a second transmission technology according to internet protocol standards, the method for being executed by a mobile services switching centre that comprises a storage for storing an identification of a radio network controller, an indication whether a radio network controller supports the first transmission technology, an indication whether a radio network controller supports the second transmission technology, an identification of a media gateway, an indication whether a media gateway supports the first transmission technology, an indication whether a media gateway supports the second transmission technology, said method comprising the steps of: selecting a radio network controller for a connection, determining the transmission technology supported by the selected radio network controller, selecting a media gateway that supports the same transmission technology.
6. Method for selecting a media gateway in a radio network controller wherein, the media gateway comprises a storage comprising an identification of a media gateways, an indication whether a media gateway supports the transmission of payload according to asynchronous transfer mode protocols, an indication whether a media gateway supports the transmission of payload according to internet protocols, and an address for contacting a media gateway according to the respective transmission technology, the method comprising the steps of: - receiving an identification of a selected media gateway,
- looking up which transmission technologies are supported by the media gateway, selecting a transmission technology that is supported by the media gateway,
- retrieving from the storage the respective address allocated to the selected media gateway for the selected transmission technology.
7. Media gateway for sending and receiving payload according to internet protocols, comprising means for receiving from the radio network controller an establish request message comprising an internet protocol address of the radio network controller and an identification of a radio network controller port to be used for the payload connection, means for processing the establish request message in the media gateway, and means for returning an establish confirm message comprising an internet protocol address of the media gateway and an identification of a media gateway port to be used for the payload connection.
8. Radio network controller for establishing a payload connection according to internet protocols to a media gateway for sending and receiving payload according to internet protocols, comprising means for receiving from a mobile services switching centre a radio access bearer assignment request message comprising an internet protocol address of the media gateway and a binding identification, means for processing the radio access bearer assignment request message in the radio network controller, means for sending to the media gateway an establish request message comprising an internet protocol address of the radio network controller and an identification of a radio network controller port to be used for the payload connection, and means for receiving an establish confirm message comprising an internet protocol address of the media gateway and an identification of a media gateway port to be used for the payload connection.
EP03787762A 2002-08-10 2003-08-11 Method for setting up a connection between a radio network controller and a media gateway Withdrawn EP1527638A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03787762A EP1527638A2 (en) 2002-08-10 2003-08-11 Method for setting up a connection between a radio network controller and a media gateway

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP02017974 2002-08-10
EP02017974 2002-08-10
EP03787762A EP1527638A2 (en) 2002-08-10 2003-08-11 Method for setting up a connection between a radio network controller and a media gateway
PCT/EP2003/008912 WO2004017643A2 (en) 2002-08-10 2003-08-11 Method for setting up a connection between a radio network controller and a media gateway

Publications (1)

Publication Number Publication Date
EP1527638A2 true EP1527638A2 (en) 2005-05-04

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EP03787762A Withdrawn EP1527638A2 (en) 2002-08-10 2003-08-11 Method for setting up a connection between a radio network controller and a media gateway

Country Status (3)

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EP (1) EP1527638A2 (en)
AU (1) AU2003263209A1 (en)
WO (1) WO2004017643A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100456846C (en) * 2005-11-28 2009-01-28 华为技术有限公司 Wireless network end office and call switching method
US8660609B2 (en) * 2007-09-14 2014-02-25 Telefonaktiebolaget L M Ericsson (Publ) Method and system for IP network admission control

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Publication number Priority date Publication date Assignee Title
US6990089B2 (en) * 2000-12-12 2006-01-24 Telelec Methods and systems for routing messages in a radio access network

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004017643A2 *

Also Published As

Publication number Publication date
AU2003263209A1 (en) 2004-03-03
WO2004017643A2 (en) 2004-02-26
AU2003263209A8 (en) 2004-03-03
WO2004017643A3 (en) 2004-06-03

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