Raj Yavatkar and Namrata Bhagawat. Improving end-to-end performance of TCP over mobile internetworks. In Mobile '94 Workshop on Mobile Computing Systems and Applications, December 1994.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....or last hop wireless links. Video transport protocols can take advantage of loss differentiation in two key ways. The first is the well known performance optimization where only congestion losses are used as congestion signals, and wireless losses do not restrict the sending rate [1] 2] [3]. The second is to provide useful feedback to the video encoder. For example, if wireless losses are dominating, the encoder can adjust the balance between bits devoted to source coding (representing the video) and bits devoted to channel coding (protecting the source coded bits) The focus of our ....

....the benefits of differentiating wireless losses from congestion losses for TCP connections, and developing various techniques for preventing TCP from reacting to wireless losses as if they indicated congestion. Examples of these techniques include splitting TCP connections at the base station [1] [3], and local retransmissions based on snooping at the wireless base station [2] Balakrishnan et al. 9] evaluated some of these techniques, demonstrating that they can substantially improve TCP throughput and goodput. However, most of these schemes assume a network where the wireless link is the ....

R. Yavatkar and N. Bhagwat, "Improving end-to-end performance of TCP over mobile internetworks," in Workshop on Mobile Computing Systems and Applications, pp. 146--152, Santa Cruz, CA, Dec 1994.

....reason for doing this is to ensure ecient implementation of transport protocols and to shield the fixed network from the idiosyncrasies of the mobile network. A complete protocol stack specification for the mobile network may be found in [2] Observe that implementations such as I TCP[1] and MTCP[4] also split the TCP connection in two. But do so at ei ther the MSS or at some node close to the MH. Our architecture generalizes this idea and enables the SH to exercise greater control on how data is transmitted to the MH. For example, if a MH has several open data connections, the SH can ....

R. Yavatkar and N. Bhagawat. Improving end-to-end performance of TCP over Mobile Internetworks. IEEE 1994.

....and, in addition, use new data transfer protocols that are optimized for the mobile environment. Several authors have developed solu tions to some of these problems. Thus, 7] presents a solution for location management, 4, 6, 9] discuss the problem of routing packets in a mobile environment and [2, 10, 5] present transport layer protocols optimized for the mobile environment. 2 We believe that a large number of services requested by mobile users will be multicasted to them (for efficiency reasons) from the various service providers located around the world. Some examples of such services ....

R. Yavatkar and N. Bhagawat,"Improving End-to-End Performance of TCP over Mobile Internetworks", IEEE 1993.

....of proposed solutions for improving TCP performance for cellular networks. Section 3 presents our protocol design in detail and section 4 discusses some implementation issues. We study its performance in section 5 and summarize our work in section 6. 2 Literature Review Many papers (see [1, 2, 3, 13]) have been written proposing methods for improving TCP performance in cellular networks where the last link is the only wireless link in the system. The typical solution As of this writing, ECN was actively debated on mailing lists, see: http: www nrg.ee.lbl.gov ecn arch Our decision to ....

R. Yavatkar and N. Bhagawat,\Improving End-to-End Performance of TCP over Mobile Internetworks ", IEEE 1994.

....one between the fixed sender and the base station and the other between the base station and the mobile receiver. The losses that are not related to congestion are recovered by the connection between the base station and the mobile host, and hence hidden from the fixed sender. I TCP [2] MTCP [3], M TCP [4] and METP [5] are examples of this approach. Some of these approaches do not maintain the end to end semantics of TCP. These protocols may require state to be maintained and packets to be buffered at the base station. In the TCP aware link layer protocols, the link layer is aware of ....

R. Yavatkar and N. Bhagawat, "Improving End-to-End Performance of TCP over Mobile Internetworks," Workshop on Mobile Computing Systems and Applications, December 1994.

....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 [4, 5, 6, 15]. An IETF work group dedicated to TCP over satellite link is undergoing an intense effort to identify specific mechanisms [2] and issues [3] to adapt TCP to this environment. Among these issues is the problem discussed by the present paper. Our interest is in mechanisms that impose minimal demands ....

R. Yavatkar and N. Bhagwat, "Improving end-to-end performance of TCP over mobile internetworks, " in Workshop on Mobile Computing Systems and Applications, Dec. 1994. 17

....operation [4] Since the BS maintains state information for each TCP connection this needs to be transferred to the new BS. An improved version of I TCP permits the mobile node to adapt to the peculiarities of the wireless link, such as smaller MTUs, fading errors and lower bandwidth [9]. The MTCP [18] protocol proposes a similar approach with that of I TCP except that the last byte of data is acknowledged to the sender only after this has reached the mobile host (end to end semantics are preserved) Depending on the reception of the last byte acknowledgement or not the sender ....

R. Yavatkar, N. Bhagawat, Improving End to End Performance of TCP over Mobile Networks, Proceedings of Mobile '94, Workshop on Mobile Computing Systems and Applications, Santa Cruz, CA, December 1994.

....approach requires the connection between the fixed host and the mobile host to be split into two separate connections at the base station one connection between the sender and the base station and the other between the base station and the receiver. The solutions such as I TCP [5] MTCP [4], M TCP [9] METP [14] come under this category. End To End protocols: In an end to end approach the sender and receiver adapt a mechanism to handle all possible packet losses. The solutions such as TCP New Reno [2] Fast Retransmission [6] Selective Acknowledgement [3] 11 ] SMART based ....

R.Yavatkar and N. Bhagwat, "Improving end-to-end performance of TCP over Mobile Internetworks", Proceedings IEEE Workshop on Mobile Computing Systems and Applications, Santa Cruz, CA, December 1994. Discusses a Split-Connection approach for TCP over wireless links

.... an unnecessary reduction in the link s bandwidth utilization, thereby causing a significant degradation in performance in the form of poor throughput and very high interactive delays [Cace94] Recently, several reliable transport layer protocols for networks with wireless links have been proposed [Bakr94, Bakr95, Cace94, Yava94] to alleviate the poor end toend performance of unmodified TCP in the wireless medium. These proposals fall into two classes of approaches: the split connection approaches and the link layer reliability approaches. 2.4.1 The Split Connection Approaches [Badrinat93, Bakre95] The Indirect TCP ....

....the fixed host and the base station, and the other between the base station and the mobile host. Since the second connection is over a one hop wireless link, there is no need to use TCP on this link. Rather, a more optimized wireless link specific protocol tuned for better performance can be used [Yava94]. During a handoff, the I TCP connections must move from the base sta 45 tion currently forwarding data to another one. This is done by transferring the state associated with the two connections to the new base station. The advantage of the split connection approach is that it achieves a ....

[Article contains additional citation context not shown here]

R. Yavatkar and N. Bhagwat. Improving End-to-End Performance of TCP over Mobile Internetworks. In Mobile 94 Workshop on Mobile Computing Systems and Applications, December 1994. 170

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Raj Yavatkar and Namrata Bhagawat. Improving end-to-end performance of TCP over mobile internetworks. In Mobile '94 Workshop on Mobile Computing Systems and Applications, December 1994.

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R. Yavatkar and N. Bhagawat. Improving end-to-end performance of TCP over mobile internetworks. In Proceedings of the IEEE Workshop on Mobile Computing Systems and Applications, pages 146--152, December 1994.

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R. Yavatkar and N. Bhagawat. Improving end-to-end performance of TCP over mobile internetworks. In Proceedings of the IEEE Workshop on Mobile Computing Systems and Applications, pages 146--152, December 1994.

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R. YAVATKAR AND N. BHAGWAT. Improving End-to-End Performance of TCP over Mobile Internetworks. In Workshop on Mobile Computing Systems and Applications (1994).

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R. Yavatkar and N. Bhagawat, "Improving End-to-End Performance of TCP over Mobile Internetworks," Workshop on Mobile Computing Systems and Applications, December 1994.

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Raj Yavatkar, Namrata Bhagwat , "Improving end-to-end performance of TCP over mobile networks."

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R. Yavatkar and N. Bhagawat, "Improving end-to-end performance of TCP over mobile internetworks," in Proceedings of the IEEE Workshop on Mobile Computing Systems and Applications, December 1994, pp. 146--152.

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R. Yavatkar and N. Bhagwat, "Improving end-to-end performance of TCP over mobile internetworks," in Mobile 94 Workshop Mobile Computing Syst. Appl., Dec. 1994.

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Yavatkar, R., Bhagawat, N., "Improving End-to-End Performance of TCP over Mobile Internetworks," Proc. Workshop on Mobile Computing Systems and Applications, IEEE Computer Society Press, Los Alamitos, California, 1994. Authors' Addresses Questions about this document may be directed at:

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R. Yavatkar and N. Bhagawat, "Improving End-to-End Performance of TCP over Mobile Internetworks," in IEEE Workshop on Mobile Computing Systems and Applications, December 1994.

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R. Yavaatkar and N. Bhagwat, "Improving End-to-End Performance of TCP over Mobile Internetworks," Proceedings of the Workshop on Mobile Computing and Applications, pp. 146--152, Dec. 1994.

No context found.

R. Yavaatkar and N. Bhagwat, "Improving End-to-End Performance of TCP over Mobile Internetworks," Proceedings of the Workshop on Mobile Computing and Applications, pp. 146--152, Dec. 1994.

No context found.

R. Yavatkar and N. Bhagawat. Improving end-to-end performance of TCP over mobile internetworks. In Proceedings of the IEEE Workshop on Mobile Computing Systems and Applications, pages 146--152, December 1994.

No context found.

R. Yavatkar and N. Bhagawat. Improving end-to-end performance of TCP over mobile internetworks. In Proceedings of the IEEE Workshop on Mobile Computing Systems and Applications, pages 146--152, December 1994.

No context found.

R. Yavatkar and N. Bhagawat, \Improving end-to-end performance of tcp over mobile internetworks," in IEEE Workshop on Mobile Computing Systems and Applications, 1994.

No context found.

R. Yavatkar and N. Bhagwat, "Improving end-to-end performance of TCP over mobile internetworks," in Workshop on Mobile Computing Systems and Applications, pp. 146--152, Santa Cruz, CA, Dec 1994.

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