Patent ID: 7170869

Claim:
A system for applying a multi-protocol label switching (MPLS) network in general packet radio service (GPRS), the MPLS network being established by multiple differentiated service (DS) domains, each DS domain constructed by multiple label switching routers (LSRs) and label edge routers (LERs), the system comprising: at least a LER for use as a service GPRS supporting node (SGSN) connected to a wireless network base station, the SGSN interfacing to the LSR of its DS domain via a Gn interface; and at least a LER for use as a gateway GPRS supporting node (GGSN) connected to a packet switching network, the GGSN interfacing to the LSR of its DS domain via the Gn interface, wherein the Gn interface at a signalling plane between two SGSNs, between two GGSNs, or between a SGSN and a GGSN has a protocol stack including a physical layer, a MPLS layer over the physical layer and a RSVP/GTP layer over the MPLS layer, so as to utilize IP addresses of all SGSNs and GGSNs to establish all one-to-one pre-created label switching paths (LSPs) in the MPLS network of a GPRS backbone network in an initial state; the Gn interface at a transmission plane for GGSN has a protocol stack including a physical layer, a MPLS layer over the physical layer, a GTP layer over the MPLS layer and an IP layer over the GTP layer; the Gn interface at a transmission plane for SGSN has a protocol stack including a physical layer, a MPLS layer over the physical layer, a GTP layer over the MPLS layer and a relay layer over the GTP layer, so as to transmit packets between SGSN and GGSN by pre-created LSP and LSP tunneling.