High-speed Internet access through unidirectional geostationary satellite channels
High-speed Internet access through unidirectional geostationary satellite channels
复制标题
通过单向地球静止卫星通道高速互联网接入
DOI：
10.1109/49.748816
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
R. Cohen
中科院分区：
文献类型：
--
作者：
Ina Minei;R. Cohen
为提高互联网接入速度而提出的解决办法之一是将家庭用户连接到直接卫星信道，其速度比普通电话调制解调器快20倍。通过卫星链路进行通信的特点往往是偶发的高误码率和突发丢失。在Ka波段工作时尤其如此，因为天气条件会极大地影响链路可用性。在这种情况下，主要由数据应用程序使用的TCP协议的性能急剧下降。通过仿真，本文研究了TCP在不同网络条件下的性能。几个修改，利用卫星信道的特殊性质，提出了一种新的发送算法，可以有效地处理突发丢失。所提出的新发送器算法的主要吸引力在于，它只能在卫星地面站实现，而不是在世界上的每个服务器上实现。
One of the proposed solutions for increasing the speed of Internet access is to connect the home user to a direct satellite channel, at a speed 20 times faster than that of an average telephone modem. Communication over satellite links is often characterized by sporadic high bit-error rates and burst losses. This is especially true when working in the Ka band, where weather conditions greatly affect link availability. Under such conditions, the TCP protocol that is predominantly used by data applications degrades dramatically in performance. Using simulations, this paper studies the performance of TCP under different network conditions. Several modifications, that take advantage of the special properties of the satellite channel, are proposed, and a new sender algorithm which can efficiently handle burst losses is presented. The main attractiveness of the proposed new sender algorithm is that it can be implemented only at the satellite ground station, rather than at every server in the world.