Improved medium access control for data traffic via satellite using the CFDAMA protocol
Improved medium access control for data traffic via satellite using the CFDAMA protocol
复制标题
使用 CFDMA 协议改进通过卫星传输的数据流量的介质访问控制
DOI：
10.1049/ic:20000542
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
D. Grace
中科院分区：
文献类型：
--
作者：
P. Mitchell;T. Tozer;D. Grace
本文探讨了一种有效的卫星数据传输介质访问控制协议。组合自由/需求分配多路访问（CFDAMA）协议将数据槽的自由分配与需求分配相结合，在低负载下提供一个往返时间的最小延迟，在高负载下提供需求分配的统计多路复用增益。在泊松流量模型和自相似流量模型下，探讨了CFDAMA的延迟/利用率性能。对于泊松流量，CFDAMA提供了极低的端到端延迟和数据包传输延迟的变化，在很大的负载范围内，延迟可达信道容量的85%。对于自相似业务，发现该方案受限于较低的最大信道负载，但在较低的信道负载下性能较好。强调了准确的流量模型在网络性能评估中的重要性。比较了CFDAMA和槽ALOHA协议，结果表明，CFDAMA在几乎整个信道利用率范围内都优于槽ALOHA。(7页)
This paper explores an efficient medium access control protocol for carrying data traffic via satellite. The combined free/demand assignment multiple access (CFDAMA) protocol combines free assignment of data slots with demand assignment, providing a minimum delay of one round trip time at low loads and the statistical multiplexing gains of demand assignment at high loads. The delay/utilisation performance of CFDAMA is explored for both Poisson and self-similar traffic models. It is shown for Poisson traffic that CFDAMA provides both extremely low end-to end delay and variance in delay of packet transmissions over a wide range of loads up to 85% of the channel capacity. For self-similar traffic, it has been found that the scheme is limited to a lower maximum channel loading, but performs better at low channel loads. The importance of an accurate traffic model in network performance evaluation is highlighted. Comparisons are made between CFDAMA and the slotted ALOHA protocol, and it is shown that CFDAMA outperforms slotted ALOHA over virtually the entire range of channel utilisation. (7 pages)