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Routing messages

a message and routing technology, applied in the field of routing messages, can solve the problems of insufficient routing according to the current 3gpp ims standard, inability or difficulty to find an s-cscf, and inability to balance load

Inactive Publication Date: 2006-06-08
NOKIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides methods for routing messages in an IMS system. The methods involve receiving a message, obtaining address information for a network function, and sending the message to the network function using the address information. The network function can be an application server, a server, a gateway, or a database. The methods can be followed when the message is for an IMS target or a non-IMS target. The invention also provides a method for routing a message from a network function to an entry point of a target network. The methods can be implemented using a database, a table, a file, or a list. The invention also provides a method for converting a message to a different protocol and routing it to a proxy or another network. The technical effects of the invention include improved message routing and more efficient communication in an IMS system."

Problems solved by technology

However there is a problem where the target identity is not an IMS identity non-IMS identities are routed over the IMS network to a non-IMS network.
There are cases where it is difficult or impossible to find an S-CSCF.
c) If a third party user uses a group identity as target address e.g. a message is sent to a group by a user that is not the “owner” of the group identity, there is a problem in deciding which S-CSCF should be used when the group server sends a message to each member of the group.
In the second one (i.e. if the default is used), the problem is how the load is balanced (Round robin functionality in DNS may be used.)
Routing with service identities is another problem of IMS.
There is a similar problem with group identities created by users.
The problem of using a service and group identity is the creation / modification / deletion of a more or less temporary entry in HSS in order to make the routing possible via an S-CSCF to a proper AS, server, gateway, network function, network entity or alike.
It has also been found that when a Presence List Server (PLS) subscribes to the presence information of presentities, the routing done according to the current 3GPP IMS standard is not optimal.
There exists a problem that if a group server is seen as an application server, an ISC interface should be used.
This has the disadvantage that routing is complicated in that an S-CSCF is needed in both the terminating and originating cases.
Another problem is that in known arrangements, the application server has to store all used service identities into an SLF, an HSS and / or another subscriber database.

Method used

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Examples

Experimental program
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first embodiment

[0142] Reference will now be made to FIG. 2a, which shows the routing used in the invention. In particular, the routing of non-IMS schemes and service / group identities and dynamic identities is shown. It should be appreciated that in FIG. 2a, the routing of terminating sessions / transaction from the I-CSCF to the GWI / S / AS are shown. The same reference numbers will be used for the same entities as shown in FIG. 1.

[0143] In step T1, the I-CSCF 100 receives a message such as initial INVITE or MESSAGE.

[0144] In step T2, the I-CSCF 102 makes a query to the SLF / HSS 102. The SLF / HSS returns the address of the correct GS / S / AS 106. Optionally, the SLF / RSS 102 may return the address of the database or server such as a HSS, UMS user mobility server or SSR subscriber service router or repository or database containing dynamic public user identities or database containing dynamic service identities or other database. SLF / HSS denotes SLF, or HSS in the case there is no SLF.

[0145] In step T3, the...

second embodiment

[0195] the present invention will now be described with reference to FIGS. 3a and 3b.

[0196] In order to avoid finding a S-CSCF for a session / transaction, where no S-CSCF is allocated or it is difficult to find out the address of the allocated S-CSCF, the session / transaction is routed from the GW / S / AS to an O-CSCF i.e. outbound proxy, From O-CSCF i.e. outbound proxy the session / transaction is routed further to I-CSCF of the target network.

[0197] The O-CSCF i.e. the outbound proxy may be bypassed when the target network is the same network i.e. the target I-CSCF is located in the same network or in a trusted network. In this case session / transaction is routed directly from GW / S / AS to the I-CSCF.

[0198] This embodiment of invention can be applied at least to the following cases: [0199] a) routing from GW / S / AS (e.g. from IMS WV gateway) non-IMS traffic (e.g. with WV scheme) via IMS network to another IMS network [0200] b) routing from GW / S / AS sessions / transactions where the originator...

third embodiment

[0223] Reference is made to FIG. 4 which shows the signal flow in the present invention. In step C1, a subscribe message is sent from the user equipment 400 to the P-CSCF 402. In step C2 the subscribe message is sent from the P-CSCF 402 to the S-CSCF 404. In step C3 the subscribed message is sent from the S-CSCF 404 to the PLS(AS) 406. The PLS(As) sends in step C4 a 200 OK message (which is a SIP acknowledgement message) back to the S-CSCF 404. In step C5, the S-CSCF 404 sends the 200 OK message to the P-CSCF 402. The P-CSCF 402 sends the 200 OK message in step C6 to the user equipment 400. The flow shown in FIG. 4 now shows two options.

[0224] The optimal signal flow will now be described as followed. The next step is for a prescribed message to be sent in step C7 from the PLS (AS) 406 to the I-CSCF 408. In step C8, there is a HSS query where the I-CSCF 408 sends a query to the HSS 410 and receives a reply. The HSS will return the correct S-CSCF or the capabilities of a needed S-CSC...

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Abstract

This invention relates to a method of routing for a message via an IMS system is disclosed. A message is received at an ICSCF. Address information is obtained for one of an application server, server or gateway for which said message is intended. The message is sent to said application server, server or gateway in accordance with said address information.

Description

FIELD OF THE INVENTION [0001] The present invention relates to the routing of messages, and in particular but not exclusively in an IMS system. BACKGROUND TO THE INVENTION [0002] The introduction of Third Generation (3G) communication systems will significantly increase the possibilities for accessing services on the Internet via mobile user equipment (UE) as well as other types of UE. [0003] Various user equipment (UE) such as computers (fixed or portable), mobile telephones, personal data assistants or organisers and so on are known to the skilled person and can be used to access the Internet to obtain services. Mobile user equipment referred to as a mobile station (MS) can be defined as a means that is capable of communication via a wireless interface with another device such as a base station of a mobile telecommunication network or any other station. Such a mobile user equipment can be adapted for voice, text message, data communication or multimedia communication via the wirel...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L12/28H04L12/56H04L45/74
CPCH04L65/1016H04W76/022H04L65/1006H04L61/3095H04W40/00H04L61/1541H04L29/1216H04L65/1066H04L67/327H04L45/72H04L61/1588H04L61/157H04L29/12113H04L29/12188H04W12/06H04L67/16H04L69/327H04L45/74H04L29/12594H04W8/08H04L47/18H04L47/10H04W84/18H04W4/12H04L47/00H04L45/00H04W8/02H04L67/14H04W76/12H04L61/4541H04L61/4557H04L61/4588H04L61/30H04L2101/395H04L65/1104H04L67/51H04L67/63
Inventor WESTMAN, ILKKALAHTINEN, LAURIBERES, ERVINBAJKO, GABORKISS, KRISZTIANBERTENYI, BALAZS
Owner NOKIA CORP