The throughput of slotted ALOHA systems with multipacket message transmissions is evaluated. The conventional strategy of retransmitting the entire message when collisions occur results in a reduction in throughput when compared with the single packet case. However, it is demonstrated that the use of ARQ-type retransmission protocols can provide significant performance improvement. In particular, a simple go-back-N (GBN) protocol is shown to offer a modest throughput increase, while a selective reject (SREJ) strategy provides exactly the same throughput as a single packet slotted ALOHA system, irrespective of message length statistics. These results motivate a new scheme (referred to as unslotted ALOHA with selective retransmission, ALOHA/SR) for increasing the throughput of unslotted random access channels.
|Original language||English (US)|
|Number of pages||6|
|Journal||Conference Record - International Conference on Communications|
|State||Published - 1983|
All Science Journal Classification (ASJC) codes
- Computer Networks and Communications
- Electrical and Electronic Engineering