The throughput efficiency of the ideal selective-repeat ARQ scheme （with infinite receiver buffer） is independent of the round-trip delay[1]. However

to achieve this ideal throughput efficiency

extensive buffering （theoretically infinite） is required at the receiver because ordinarily data blocks must be delivered to the user in correct order. If a finite buffer is used at the receiver

buffer overflow may occur and will reduce the throughput of the system. In this paper the throughput performance of the selective-repeat ARQ which operates with a finite receiver buffer store is provided and if the buffer overflow is handle properly

the selective-repeat ARQ still offers better performance.