H.Balakrishnan, V.N.Padmanabhan, S.Seshan, R.H.Katz (1997), "A Comparision of Mechanisms for Improving TCP Performance over Wireless Links", IEEE/ACM Trans. On Networking, Vol.5, No.6, Dec. 97.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....chances to get duplicated ACKs because there are few packets in the window in the first place. So, if the packet error rate is higher than a specific value, it is possible that the throughput is almost zero. This problem is well studied in numerous works. A summary can be found e.g. in [6] In [7], a snoop protocol has been developed to improve the performance of TCP flows over wireless links. The snoop agent located at the base station caches every packet, suppresses the duplicate acknowledgements (ACKs) and triggers the retransmission of packets accordingly. However, TCP is not suitable ....

H.Balakrishnan, V.N.Padmanabhan, S.Seshan, R.H.Katz (1997), "A Comparision of Mechanisms for Improving TCP Performance over Wireless Links", IEEE/ACM Trans. On Networking, Vol.5, No.6, Dec. 97.

....for wireless networks, it is worth discussing the motivation, in order to understand our experimental methodology, as well as the choice of measured parameters. Motivation: In recent years, with the advent of mobile computing, there has been significant interest in using TCP over wireless links [12, 2, 6, 3, 2, 1, 7]. Previous work has shown that, unless the protocol is modified, TCP performs poorly on paths that include a wireless link subject to transmission errors. The reason for this is the implicit assumption in TCP that all packet losses are due to congestion. Whenever a TCP sender detects a packet ....

....loss is due to congestion, however, it can unnecessarily reduce throughput if packet losses happen to be due to wireless transmission errors. Past proposals for improving performance of TCP over wireless require some cooperation from an intermediate node on the path from the sender to the receiver [1, 2, 3, 16]. Our interest is in mechanisms that impose minimal demands (if any) on any host other than the sender or the receiver. Ideally, it would help if the sender could differentiate between packet losses due to congestion from the packet losses due to wireless transmission errors, using some end to end ....

H. Balakrishnan, V. Padmanabhan, S. Seshan, and R. Katz, "A comparision of mechanisms for improving TCP performance over wireless links," in ACM SIGCOMM, Stanford, CA, Aug. 1996.

....until the expected ack is received, or number of retransmissions exceeds a threshold. Link level retransmissions provide higher link level reliability; which benefits all types of traffic, TCP and non TCP. Unfortunately, link level retransmissions interfere with retransmissions by the TCP sender [3]. Therefore, researchers have developed several schemes to allow so called local recovery (essentially consisting of retransmissions from the base station) that do not interfere with TCP s retransmission mechanism. In this paper, we present a new and much simpler scheme to improve performance ....

....variable. BS is in progress, the sender may either (i) time out, or (ii) receive 3 dupacks from the mobile host. In either case, the sender will also retransmit the lost packet, leading to the so called interference phenomenon. Such interference can result in poor throughput, as shown in [3]. 3 Related Work There has been interesting research on improving TCP performance in the presence of transmission errors [1, 2, 3, 4, 5, 7] Indirect TCP protocols [1, 7] break one TCP connection into two one for the last wireless hop, and one for the rest of the path. This approach violates ....

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H. Balakrishnan, V. Padmanabhan, S. Seshan, and R. Katz, "A comparision of mechanisms for improving TCP performance over wireless links," in ACM SIGCOMM, Stanford, CA, Aug. 1996.

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