SYSTEM AND METHOD FOR VOICE CALL SOFT HAND-OFF BETWEEN ALL IP MOBILE NETWORK AND LEGACY MOBILE NETWORK

摘要

A system and a method for performing voice call soft handoff between an ALL IP mobile communication network and an existing mobile communication network are provided to contribute to gradually evolve a mobile communication network from an existing network to an ALL IP network. When an MS(Mobile Station)(10) performs voice call handoff during voice call communication with one of a base station of an ALL IP network and a base station of an 1X network to the other base station, a handoff matching unit(40) converts a handoff message transmitted between an ALL IP network system and the 1X network system and transfers it. The handoff matching unit(40) converts a handoff message of an E1 HDLC frame or an ATM packet format received from the 1X network system into a handoff message of an IP packet format and transfers it to the ALL IP network system through an Ethernet interface, converts a handoff message in the IP packet format received from the ALL IP network into a handoff message in E1 HDLC frame or the ATM packet format and transfers it to the 1X network system.