CALL CONTROL AND TRAFFIC TRANSPORT FOR CONNECTION-ORIENTED HIGH-SPEEDWIRELESS PERSONAL COMMUNICATIONS OVER METROPOLITAN-AREA NETWORKS

A distributed circuit-switched approach for supporting the deployment of high speed wireless personal communication services in urban areas through the interconnection of base stations via metropolitan area net works (MAN's) is proposed. Broadband MAN's minimize traffic congestion by dynamic sharing of link capacity and by serving as distributed swi tches for partitioning call control functions. While the DQDB protocol readily supports distributed packet-switching over the IEEE 802.6 MAN , isochronous traffic such as voice and video is best supported by cir cuit-switched connections. We present an enhanced bi-state pre-arbitra ted (PA) transport mechanism, and associated call control and handoff management techniques, which enable distributed circuit-switching over the MAN. These capabilities are not currently addressed in the 802.6 standards. The bi-state PA transport mechanism facilitates statistical multiplexing of variable rate isochronous traffic sources. The networ k capacity is constrained by the call setup delay performance, and is analyzed by simulations. Alternative signaling architectures, involvin g different placements of call control network elements, are evaluated . The effects of erasure nodes, and close bus versus open bus architec tures, are considered. The overlap inter-MAN call setup procedure is p roposed to reduce delays. Different call handoff procedures are formul ated according to the type of handoff and the resulting change in call connectivity. Most handoffs are intra-MAN, requiring simple procedure s with short delays.