Method for the interception of gtp-c messages

Description of equivalent WO 2007028225 A1

Method for the interception of GTP-C messages

BACKGROUND ART:

Related teachings in the state of the art as U.S. Patent Application 20030081607 by Kavanagh, entitled general packet radio service tunneling protocol (GTP) packet filter, discloses a method of filtering data packets in General Packet Radio Service (GPRS) Tunneling Protocol (GTP) signaling messages, whereby selected messages from GTP Path Management, GTP Tunnel Management, GTP Mobility Management, and GTP Location Management messages are analyzed against a plurality of filtering criteria, and data packets that do not meet such filtering criteria are dropped while data packets that meet the criteria are passed. However, the application by Kavanagh speaks to a module for selective filtering of GTP Data packets, whereas our invention of present seeking the protection of Letters Patent, is largely directed at proxying and filtering GTP Control packet(s), which are on a separate UDP port number and perform a different set of business operations.

WIPO Patent Application (WO) 03067830 by Camunas et al., entitled a system to obtain value- added services in real-time, based on the General Packet Radio Service (GPRS) network, discloses a system to obtain value-added services in real-time based on the General Packet Radio Service (GPRS) network, which comprises SGSN and GGSN nodes to enable the access from a mobile station to different data networks, using the radio access of a GSM or UMTS network; wherein between the SGSN and GGSN nodes the invention comprises means to handle GTP protocol data packets, and wherein the GTP messages traffic, which would have otherwise flowed directly between the SGSN and the GGSN nodes, is diverted through said means. When said means detect a GTP message from an SGSN asking a GGSN for the establishment of a GTP tunnel for a PDP context, said means establish instead two GTP tunnels: one between the Camunas et al.'s invention and the SGSN and the other between Camunas et al.'s invention and the GGSN (once established, the user data packets will arrive through one of the two tunnels associated to their PDP Context and will be transferred to the other tunnel). However, Camunas et al.'s invention requires all GTP packets to be intercepted, whereas the invention disclosed herewith only requires and speaks to the intermediation of GTP-C (the control) packets which remains a more resourceful approach to advancing the practice of the art. Furthermore, our invention may monitor the GTP-U packets or alternatively rely on the packet intermediations of the method for implementing an Internet Protocol (IP) charging and rating middleware platform and gateway system as detailed in Patent Application 10/348972, for the purpose of providing the data intermediation and intercept functionality on the data plane. (Technicians skilled in the art will recognize that the invention of present need not be limited to the aforementioned method for implementing an Internet Protocol (IP) charging and rating middleware platform and gateway system and other similar network implementations may be employed without diluting the intent and scope as such).

REFERENCES CITED:

U.S. Patent Application

20030081607 May, 2003 Kavanagh, A. 370/392

Foreign Patent Document(s) 03067830 Aug., 2003 WIPO

TECHNICAL FIELD:

The present invention relates generally to wireless telecommunications and gateway/intercept services; and more specifically, to a method for the interception of GTP messages.

SUMMARY OF THE INVENTION:

Disclosed is a species of control-message intercept method which includes a passive monitoring approach whereby the relevant control packets are inspected for the purpose of providing additional information for the further additional purpose of facilitating the operation of some primary or 'master' Internet Protocol (IP) charging/rating middleware platform / gateway system (intended to equip network operators with the ability to rate and bill IP traffic), and secondly, an invasive technique whereby control (GTP-C) messages are injected for the purpose of altering the state of a given data session in an more aggressive fashion (e.g. to drop a data session when the subscriber runs out of money in his/her prepaid account).

BRIEF DESCRIPTION OF THE DRAWINGS:

FIG. 1 illustrates a typical, non-limiting embodiment of the system level architecture employed in the disclosure of present.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS:

Members skilled in the art will recognize that the ensuing represents an illustrative recital of the preferred embodiments of the invention of present and other embodiments may be articulated, gleaned and articulated from such while still remaining with in its spirit and scope. Indeed, equivalents found within the state of the art, and those which may reasonably and effectively be deemed equivalent in the future should also be understood as being incorporated by reference hereto and such. Furthermore, much of the language has been illustrative and is to be construed as expressly for pedagogical purposes in helping elucidate the art as concisely and beneficially as practical.

The method for the interception of GTP messages disclosed herewith is implemented as part of a computer program product, hereinafter, the GTP-C Control Module.

FIG. 1 represents the preferred illustrative embodiment of the invention's architecture and, as such, depicts a fault redundant GTP-C Control Module pair 3OA 3OB surrounded by Load Balancers on either side of the pair 2OA 2OB (one pair 2OA on the SGSN side 10, the other pair 2OB on the GGSN side 50).

In alternate embodiments, only a partial GTP-C stack need be articulated and developed when only handling a fraction of the totality of the messages. (These operations are CreateContextRequest/Response, UpdateContextRequest/Response and DeleteContextRequest/Response, although practitioners may well realize that other iterations and operations may be articulated). In this alternate embodiment, for the remainder of the messages, we need only be able to identify them as GTP-C messages and forward them on. (Indeed, this art is not intended to represent a proxy design. The GTP-C connection is generally not terminated at the GTP-C CM).

The method for the interception of GTP messages, in the preferred embodiment (though of course not necessarily), may also be co-articulated and implemented with the method for implementing an Internet Protocol (IP) charging and rating middleware platform and gateway system as detailed in Patent Application 10/348972, to enhance the packet/data rating and classification mechanisms inherent in the invention disclosed hereto. Technicians skilled in the art will recognize that the invention of present need not be limited to the aforementioned method for implementing an Internet Protocol (IP) charging and rating middleware platform and gateway system and other similar network implementations may be employed without diluting the intent and scope as such.

Now, in continuing with reference to FIG. 1, upon detection of a CreateContextRequest (for instance), said message will be delayed while the method for implementing an Internet Protocol (IP) charging and rating middleware platform and gateway system 4OA 4OB (as detailed in Patent Application 10/348972) is contacted for balance query. (Technicians skilled in the art will recognize that the invention of present need not be limited to the aforementioned method for implementing an Internet Protocol (EP) charging and rating middleware platform and gateway system and other similar network implementations may be employed without diluting the intent and scope as such). The message is then forwarded on to the GGSN 50 for context creation and the response forwarded back to the SGSN 10 by the invention (GTP-C CM) 30A 30B.

For deleting a context (as, when a subscriber has run out of balance), the method for implementing an Internet Protocol (EP) charging and rating middleware platform and gateway system 40A 4OB, will initiate the delete request to the invention (GTP-C CM) 30A 30B. The invention (GTP-C CM) 3OA 3OB will in turn send delete requests to both the GGSN 50 and SGSN 10 using spoofed packets.

In alternate embodiments, said deletePDPContext message can also initiate by the SGSN 10 or GGSN 50 where the invention 30A 30B intercepts the message, and further triggers the session deletion to IP charging and rating middleware platform and gateway system 4OA 4OB. The deletePDPContext may then be simply forwarded by the invention (GTP-C CM) 30A 30B to the GGSN 50 or SGSN 10 depending on the initiator of the deletePDPContext message.