Distributed Computer and Communication Networks: 17th by Vladimir Vishnevsky, Dmitry Kozyrev, Andrey Larionov

By Vladimir Vishnevsky, Dmitry Kozyrev, Andrey Larionov

This ebook constitutes the refereed complaints of the seventeenth foreign convention on disbursed machine and conversation Networks, DCCN 2013, held in Moscow, Russia, in October 2013. The 22 revised complete papers provided have been conscientiously reviewed and chosen from a number of submissions. The papers disguise the subsequent matters: desktop and communique networks structure optimization; keep watch over in computing device and conversation networks; functionality and QoS review in instant networks; modeling and simulation of community protocols; queueing idea; instant IEEE 802.11, IEEE 802.15, IEEE 802.16 and UMTS (LTE) net-works; RFID expertise and its software in highbrow transportation networks; protocols layout (MAC, Routing) for centimeter and millimeter wave mesh networks; web and internet functions and companies; program integration in disbursed details structures.

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Extra info for Distributed Computer and Communication Networks: 17th International Conference, DCCN 2013, Moscow, Russia, October 7-10, 2013. Revised Selected Papers ... in Computer and Information Science)

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10 TCP Illinois TCP Illinois is a variant of the TCP congestion control particularly indicated for high-speed long-distance networks. It was introduced by S. Liu et al. in [12] to achieve high throughput and allocate network resources fairly. It is a lossdelay based algorithm, which uses packet loss as the primary congestion signal to determine the direction of window size change, and uses queuing delay as the secondary congestion signal to adjust the pace of window size change. Similarly to the standard TCP, TCP Illinois increases the cwnd for each received ACK using a decreasing function α and decreases the cwnd using an increasing function β.

2) Based on the difference of the rates Dif f = Expected − Actual, the source updates its window size as follows: ⎧ ⎪ ⎨cwnd + 1 if Dif f < α cwnd = cwnd if α < Dif f < β . ⎪ ⎩ cwnd − 1 if Dif f > β (3) (4) Typical values for α and β are 1 or 2 and 3 or 4 respectively. A modified version of the previously described congestion detection algorithm is incorporated into the Slow Start phase. To be able to avoid congestion during Slow Start, TCP Vegas allows exponential growth only every other RTT. In between, the congestion window stays fixed so a valid comparison of the expected and actual rate can be made.

Callegari et al. 2 B − (k) b = RT Tmin ⎩ otherwise RT Tmax cwnd = b · cwnd (23) where b and a are the multiplicative decrease and the additive increase factors respectively. a(Δ) is evaluated as follows: ⎧ ⎨1 Δ ≤ ΔL low-speed L a(Δ) = (24) Δ−Δ 2 ⎩ 1 + 10(Δ − ΔL ) + ( ) Δ > ΔL high-speed 2 where Δ is the time in seconds since the last congestion event, ΔL = 1 s (typical RT Tmin value), is the ratio of minimum and maximum RT T experienced by RT Tmax − the flow, and B (k) is the throughput achieved immediately before the kth loss.

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