초록 ▼

A handoff control process in a wireless ATM network replaces an old communications connection with a new communication connection. In order to guarantee that no data is lost during the replacement process, an ATM cell level mechanism is used to re-schedule the buffering and transmitting of data stre

A handoff control process in a wireless ATM network replaces an old communications connection with a new communication connection. In order to guarantee that no data is lost during the replacement process, an ATM cell level mechanism is used to re-schedule the buffering and transmitting of data streams of the virtual channels (VCs) to be handed-off. In addition, this mechanism is transparent to user applications. The present invention performs three fundamental cell level scheduling functions. The first function is to mark and redirect cell transmission with operation and maintenance (OAM) cells. The second function is to disable and buffer cell transmission until the new path is connected. The third function is to enable cell transmission, starting with the buffered cells across the connected new path.

대표청구항 ▼

[ What is claimed is:] [1.] A method for mobile communication routing in a network including base stations, a mobile terminal, a fixed host, an ATM switch, with an established communication connection from a fixed host to said mobile terminal comprising the steps of:(a) signaling from a mobile termi

[ What is claimed is:] [1.] A method for mobile communication routing in a network including base stations, a mobile terminal, a fixed host, an ATM switch, with an established communication connection from a fixed host to said mobile terminal comprising the steps of:(a) signaling from a mobile terminal to a first base station over an established communication connection when a hand-off is to occur;(b) selecting a second base station;(c) selecting an ATM switch to act as a crossover switch;(d) signaling from said first base station to said crossover switch over said established communication connection when said hand-off is to occur;(e) establishing a portion of a new communication connection from said crossover switch to said second base station;(f) stopping transmission of data from said crossover switch to said mobile terminal over said established communication connection and starting to buffer data in a data buffer in said crossover switch;(g) stopping transmission of data from said mobile terminal to said crossover switch over said established communication connection and starting to buffer data in a data buffer in said mobile terminal;(h) releasing said established communication connection;(i) establishing a remaining portion of said new communication connection from said mobile terminal to said second base station;(j) starting transmission of data from said mobile terminal to said crossover switch via said second base station and said new communication connection; and(k) starting transmission of data from said crossover switch to said mobile terminal through said second base station and over said new communication connection.