PRIME ARQ: A novel ARQ scheme for high-speed wireless ATM

Automatic repeat request (ARQ) for wireless ATM (WATM) operating at 20 Mbit /s or higher is required to achieve high throughput performance as well as high transmission quality, i.e., low CLR (cell loss ratio). Selective Repea t (SR) and Go-Back-N (GBN) are typical ARQ schemes [2]. Though SR-ARQ is su perior to GBN-ARQ in throughput performance, the implementation complexity of SR-ARQ's control procedures is disadvantageous to its application to hig h-speed wireless systems. In addition, when PDU (protocol data unit) length on wireless link is short, the capacity for ARQ control messages can be si gnificantly large. GBN-ARQ, on the other hand, cannot avoid serious through put degradation due to fairly high BER caused by multipath fading and shado wing, though its implementation is simple. To solve the above-mentioned pro blems, this paper proposes a novel ARQ scheme named PRIME-ARQ (Partial sele ctive Repeat superIMposEd on gbn ARQ). PRIME-ARQ achieves high throughput p erformance, almost equal to selective repeat ARQ, with a simple algorithm r esulting in reduced implementation complexity for high speed operation. Thi s paper describes the design, implementation, and performance of the propos ed PRIME-ARQ. In addition, it shows the experimental results using an exper imental PRIME-ARQ hardware processor and proto-type AWA equipment.