Performance analysis of Go-Back-N ARQ scheme on parallel channel system
Chunxiang Chen, Masaharu Komatsu, Kozo Kinoshita · Electronics and Communications in Japan (Part I Communications) · 1998
In a parallel channel system, some idle channels appear if the packets waiting for transmission are less than the number of parallel channels in a slot. This paper considers a two-parallel-channel system under the Go-Back-N ARQ scheme. To effectively use the idle channels, we propose a modified packet assignment method based on the basic method. The basic assignment method assigns the packet of smaller sequence number to the higher-quality channel, and the modified one effectively uses the idle channels in the basic assignment method by transmitting packet copies in the idle channels. The queue lengths in the transmission buffer for both the basic and modified assignment methods are analyzed. Also the delay times are investigated by computer simulation. The numerical results show that although the throughput for the basic method is identical to that for the modified one, the average queue length and the delay time are remarkably reduced by the modified method. © 1998 Scripta Technica. Electron Comm Jpn Pt 1, 81(2): 10–20, 1998