Patent ID: 8472434

Claim:
A circuit service tunneling system, comprising: a first mobile service network providing packet-switched domain services; a second mobile service network providing circuit-switched domain services, and comprising an interworking system which comprises a circuit-service tunneling protocol and connects to the first and second mobile service networks to enable the first mobile service network to provide the circuit-service domain services via the second mobile service network; and a user equipment supporting a first communication protocol corresponding to the first mobile service network, a second communication protocol corresponding to a circuit-service domain of the second mobile service network, and the circuit-service tunneling protocol, and connecting to the first mobile service network, wherein the circuit-service tunneling protocol is used to establish a communication tunnel service between the user equipment and the interworking system via the first mobile service network, and one of the interworking system and the user equipment encapsulates circuit-service domain service data in a circuit-service tunneling message conforming to the circuit-service tunneling protocol and transmits the circuit-service tunneling message to the other of the interworking system and the user equipment, and the other of the interworking system and the user equipment decapsulates the circuit-service tunneling message according to the circuit-service tunneling protocol to obtain the circuit-service domain service data, wherein the circuit-service tunneling protocol is located under a Link Access Control (LAC) layer in the circuit-service domain of the second mobile service network, so that the delivery of the circuit-service tunneling message is ensured by a layer-to-layer message acknowledging mechanism provided by the LAC layer.