CAPTURE-DIVISION PACKET ACCESS FOR WIRELESS PERSONAL COMMUNICATIONS

This paper presents a new architecture for the third-generation mobile systems, capture-division packetized access (CDPA), that overcomes mo st of the limitations of present cellular systems. It addresses the th ree main issues of radio access, namely the channel reuse, the multipl e access, and the handover problems, in complete adherence to packet-s witching principles, The CDPA channel reuse mechanism is a completely new alternative with respect to time-division, frequency-division, or code-division multiple-access (TDMA, FDMA, and CDMA, respectively), wh ich achieve communication parallelism by subdividing the bandwidth a p riori among cells, In CDPA, a single frequency channel is used and par allel transmissions are achieved through the ''capture'' capability of receivers. The hybrid reservation-polling multiple access mechanism u sed in CDPA is able to integrate any kind of traffic and guarantees al most immediate retransmission of packets that are not captured, thus a ssuring their correct reception, Finally, the packet-switching approac h allows connectionless communications with any base station (BS), and eliminates the need for extra radio traffic in managing handovers, Th is turns out to be very effective in local area systems where the requ ired high bandwidth is obtained by using a pico-cell structure, In thi s paper, we present the CDPA architecture, discuss some implementation Issues, and evaluate its performance under a variety of system parame ters and operating conditions, using analytical and simulation methods .