Limitations of TCP-ELFN for Ad hoc Networks
نویسندگان
چکیده
Research on congestion control in ad hoc networks has mostly been limited to enhancing TCP based mechanisms [1, 2, 3, 4, 5]. Explicit Link Failure Notification (ELFN [1, 2]), a solution for ad hoc TCP, has been shown to outperform TCP in mobile scenarios. Studies of TCP+ELFN on static networks show throughput degradation of about 5% in several cases over TCP, however, the improvements in dynamic cases can be as large as 7 times, as shown in presented simulations. We further describe and study various limitations of TCP based approaches in general, and TCP+ELFN in particular, for congestion control on ad hoc networks. Based on our studies on queue sizes and the progression of TCP sequence numbers for various scenarios, we observe that for congestion control in ad hoc networks, hop-by-hop rate control based mechanisms along with ELFN will be better suited than TCP based mechanisms.
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تاریخ انتشار 2000