Performance of point-to-multipoint communication systems over nonstationary satellite–terrestrial links
✍ Scribed by Yoshiya Kasahara; Toshifumi Nakatani; Hui Zhao; Toru Sato
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 312 KB
- Volume
- 83
- Category
- Article
- ISSN
- 8756-6621
No coin nor oath required. For personal study only.
✦ Synopsis
The authors have been proposing a satellite point-tomultipoint communication hybrid ARQ protocol in a system in which the forward path is the satellite link and the feedback path is the terrestrial computer network. This paper evaluates the performance of the protocol by a simulation, for the case where the error rates of the receiving stations are not the same or the round-trip delay times are not the same, as well as for the case where the ACK packet may be lost in the feedback path. When the packet is lost and the reception ACK packet for a frame is not returned for a certain period, that frame must be retransmitted (timeout). This paper examines values adequate for the time-out based on the round-trip delay time. Lastly, the case where the state of the forward path is nonstationary is assumed, and a method is considered where the bit error rate is successively estimated in the receiving station. It is shown that by introducing the adaptive multicopying function for the protocol based on the estimated error rate, the average transmission delay can be improved.