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[ pdf ] Data Networks Flow Control

Data Networks Flow Control Download
Topic under  Wireless Connectivity
Source: ee.sharif.edu 
File size: 1.7 MB
File type: pdf
Last download on: Sat Mar 25, 2017 02:51:16 PM
Short Desciption:
Second Edition Data Networks DIMITRI BERTSEKAS Massachusetts Institute of Technology ROBERT GALLAGER Massachusetts Institute of Technology, 6.1 INTRODUCTION In most networks, there are circumstances in which the externally offered load is larger than can be handled even with optimal routing. Then, if no measures are taken to restrict the entrance of traffic into the network, queue sizes at bottleneck links will grow and packet delays will increase, possibly violating maximum delay specifications. Furthermore, as queue sizes grow indefinitely, the buffer space at some nodes may be exhausted. When this happens, some of the packets arriving at these nodes will have to be discarded and later retransmitted, thereby wasting communication resources.

In this chapter we identified the major flow control objectives as limiting average delay and buffer overflow within the subnet, and treating sessions fairly. We reviewed the major flow control methods, and we saw that the dominant strategies in practice are based on windows and input rate control. Window strategies combine low overhead with fast reaction to congestion but have some limitations, particularly for networks with relatively large propagation delay. Window strategies are also unsuitable for sessions that require a minimum guaranteed rate. Rate adjustment schemes are usually implemented by means of leaky buckets. However, there remain a number of questions regarding the choice and adjustment of the leaky bucket parameters in response to traffic conditions. We also described two theoretical input rate adjustment schemes. The first scheme extends the optimal routing methodology of Chapter 5 to the flow control context, and combines routing and flow control into a single algorithm. The second scheme assumes fixed, single-path routing for each session, and focuses on maintaining flow control fairness.
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