Method and system for bypassing 3GPP packet switched core network when accessing internet from 3GPP UES using 3GPP radio access network
View Patent ↗Techniques for bypassing a packet core network for Internet bound traffic from user equipment (UE) via a RAN are described herein. According to one embodiment, it is determined whether a packet of data is destined for the Internet, in response to receiving the packet from a radio network controller (RNC) of a radio access network (RAN). The packet is originated from user equipment (UE) over the RAN. The packet is routed directly to the Internet without sending the packet to an SGSN (serving GPRS support node) of a packet core network, if the packet is destined to the Internet. Other methods and apparatuses are also described.
1. A machine-implemented method for processing network traffic of a packet network, the method comprising:
determining, at an Internet access offload (IAO) gateway (IAO-GW), whether a packet of data is destined for the Internet, in response to receiving the packet from a radio network controller (RNC) of a radio access network (RAN), the packet originated from a user equipment (UE) of the RAN;
establishing a GPRS tunneling protocol (GTP) tunnel between the RNC and the IAO-GW such that data exchanged through the GTP tunnel is directly routed to the Internet at IAO-GW without going through the SGSN of the 3GPP packet core network, including
substituting, via the IAO-GW, a first transport layer address in a radio access bearer (RAB) assignment request received from the SGSN with second transport layer address, the first transport layer address being an IP address of the SGSN and the second transport layer address being an IP address of the IAO-GW, and
transmitting the RAB assignment request having the second transport layer address to the RNC to complete the RAB assignment for the UE and to create the GTP tunnel between the RNC and the IAO-GW;
routing the packet directly to the Internet without sending the packet to the SGSN of the packet core network, if the packet is destined to the Internet; and
routing the packet to the SGSN of the 3GPP packet core network if the packet is not destined for the Internet.
2. The method of claim 1 , wherein determining whether the packet is destined for the Internet and routing the packet directly to the Internet without going through the packet core network are performed within the IAO-GW located between the RNC and the SGSN of the packet core network.
3. The method of claim 1 , further comprising:
during establishing the communication session, substituting within the IAO-GW a first IP address in an acceptance message of activating a packet data protocol (PDP) context received from the GGSN via the SGSN with a second IP address, the first IP address being a user application layer IP address allocated by the GGSN and the second IP address being a user application layer IP address allocated by the IAO-GW; and
transmitting the acceptance message of activating the PDP context having the second IP address to the RNC in order to complete a PDP context creation procedure for the requested service.
4. The method of claim 1 , wherein subsequent data traversing the GTP tunnel is routed between the IAO-GW and a corresponding destination associated with the APN specified by the communication session for accessing the Internet without accessing the SGSN or GGSN of the packet core network.
5. The method of claim 3 , wherein subsequent data traversing the GTP tunnel is routed between the IAO-GW and a corresponding destination associated with the APN specified by the communication session for accessing the Internet without accessing the SGSN or GGSN of the packet core network.
6. A non-transitory machine-readable storage medium storing instructions therein, which when executed by a processor, cause the processor to perform a method for processing network traffic of a data network, the method comprising:
determining, at an Internet access offload (IAO) gateway (IAO-GW), whether a packet of data is destined for the Internet, in response to receiving the packet from a radio network controller (RNC) of a radio access network (RAN), the packet originated from a user equipment (UE) of the RAN;
establishing a GPRS tunneling protocol (GTP) tunnel between the RNC and the IAO-GW such that data exchanged through the GTP tunnel is directly routed with the Internet without going through the SGSN of the packet core network, including
substituting, via the IAO-GW, a first transport layer address of a radio access bearer (RAB) assignment request received from the SGSN with second transport layer address, the first transport layer address being allocated by the SGSN and the second transport layer address being allocated by the IAO-GW, and
transmitting the RAB assignment request having the second transport layer address to the RNC to complete the RAB assignment for the UE;
routing the packet directly to the Internet without sending the packet to the SGSN of the packet core network, if the packet is destined to the Internet; and
routing the packet to the SGSN of the packet core network if the packet is not destined for the Internet.
7. The machine-readable storage medium of claim 6 , wherein determining whether the packet is destined for the Internet and routing the packet directly to the Internet without going through the packet core network are performed within the IAO-GW coupled between the RNC and the SGSN of the 3GPP packet core network.
8. The non-transitory machine-readable storage medium of claim 6 , wherein the method further comprises:
during establishing the communication session, substituting within the IAO-GW a first IP address of an acceptance message of activating a PDP (packet data protocol) context received from the GGSN via the SGSN with a second IP address, the first IP address being allocated by the GGSN and the second IP address being allocated by the IAO-GW; and
transmitting the acceptance message of activating the PDP context having the second IP address to the RNC in order to create the GTP tunnel between the RNC and the IAO-GW.
9. The non-transitory machine-readable storage medium of claim 6 , wherein subsequent data traversing the GTP tunnel is routed between the IAO-GW and a corresponding access point associated with the APN specified by the communication session for accessing the Internet without accessing the SGSN or GGSN of the packet core network.
10. An apparatus, comprising:
a packet inspector to determine whether a packet of data is destined for the Internet, in response to receiving the packet from a radio network controller (RNC) of a radio access network (RAN), the packet originated from a user equipment (UE) of the RAN, wherein the packet inspector is configured to establish a GPRS tunneling protocol (GTP) tunnel with the RNC, such that data exchanged through the GTP tunnel is directly routed to the Internet without going through the SGSN of the packet core network, wherein establishing the GTP tunnel comprises
substituting, via the IAO-GW a first transport layer address of a radio access bearer (RAB) assignment request received from the SGSN with second transport layer address, the first transport layer address being allocated by the SGSN and the second transport layer address being allocated by the IAO-GW, and
transmitting the RAB assignment request having the second transport layer address to the RNC to complete the RAB assignment for the UE; and
a packet router coupled to the packet inspector to route the packet directly to the Internet without sending the packet to a serving GPRS support node (SGSN) of a packet core network, if it is determined that the packet is destined for the Internet, wherein the packet router is configured to route the packet to the SGSN of the packet core network if the packet is not destined for the Internet.
11. The apparatus of claim 10 , further comprising:
a first interface to receive packet from the RNC of the RAN;
a second interface to transmit the packet to the Internet if it is determined that the packet is Internet bound; and
a third interface to transmit the packet to the SGSN of the packet core network if it is determined that the packet is not Internet bound.
12. The apparatus of claim 10 , further comprising a storage for storing a list of one or more APNs, wherein the packet inspector is configured to compare the APN of the request against the list of one or more APNs, and wherein traffic of the requested APN is diverted to the Internet directly if the requested APN matches one of the listed APNs from the storage.
13. The apparatus of claim 10 , further comprising a user interface to allow a user to configure the list of one or more APNs to enable or disable a specific APN for direct Internet access without going through the packet core network.