System and method for the correction of APN in GTP messages associated with GPRS data services offered by a mobile operator using a promoter network

摘要

A method for an APN correction in a roaming relationship for the creation of a PDP Context from a mobile device that automatically selects the APN based on the IMSI used for network acquisition where a promoter operator network is used, in which a GTP filter (202, 302, 402) is provided in which the method comprises: in response to a message creating a PDP context from a support node of the service GPRS (201, 301, 401), SGSN , of the visited network that arrives at the GTP filter (202, 302, 402) from a subscriber of a double / multiple IMSI client using the promoter operator network using a default promoter APN that has been self-selected by a mobile device , or a subscriber of a mobile virtual network operator, MVNO, or a mobile virtual network facilitator, MVNE, which has an IMSI rank donated by the sponsoring operator using the same default APN promoter or a roaming network subscriber sponsor that ta Also using the same promoter APN by default, perform a check by the GTP filter of the IMSI and APN data in the GTP message, in which the IMSI is analyzed by the GTP filter (202, 302, 402) to establish whether, - The IMSI belongs to a subscriber of the sponsoring operator or - to a subscriber of a double / multiple IMSI client using the promoter operator network or - to a subscriber of an MVNO or MVNE that has an IMSI rank donated by the sponsoring operator and in which if the GTP filter establishes that the IMSI belongs to a subscriber of the sponsoring operator, the GTP filter sends a DNS query (24) to the DNS promoter operator, receives in a return message (25) from the DNS promoter operator the GGSN IP address of the promoter operator, defines the source IP in the PDP context creation message for the GTP IP address and routes (26) the PDP context creation message to a GGSN (203) of the operator network promotion girl; if the GTP filter establishes that the IMSI belongs to a subscriber of a double / multiple IMSI client, the GTP filter transfers the APN from the sponsoring APN to the home network APN of the double / multiple IMSI client, defines the source IP in the message of creating a PDP context for the GTP IP address and routes (48, 49) the message of creating a PDP context to a GGSN in the home network of the double / multiple IMSI client if the GTP filter (202, 302, 402) establishes that the IMSI belongs to a subscriber of an MVNO or MVNE that has an IMSI rank donated by the sponsoring operator, the GTP filter transfers the APN from the sponsoring APN to the MVN or MVNE home network APN, defines the source IP in the message of creation of a PDP context for the GTP IP address and routes (36) the message of creation of a PDP context to a GGSN (303) of the MVNO or MVNE thus routing the traffic of the control plane to a correct destination after an APN verification and a position APN correction, and - forcing the PDP context creation response message (27, 37, 50, 51) to pass through the GTP filter (202, 302, 402), so that upon receipt of a message of PDP context creation response response, before forwarding the PDP creation response message (28, 38, 52) to the service GPRS node (201, 301, 401), the GTP filter (202, 302, 402) manipulates the IP addresses by modifying the source IP and the destination IP to preserve the parity of IP layers with the call message to establish that data plane traffic avoids the GTP filter, so the GTP filter is maintained regardless of the traffic segment of the data plane.