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Job Summary:
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| Job Type: |
Project |
| Budget: |
$ 20-100 |
| Required
Skills: |
,
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| Attached
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(None) |
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| Status: |
Closed for bidding
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Buyer Summary:
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| Username: |
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| Feedback Score: |
Rating: (No Feedback Yet)
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| Award Reliability: |
1 posted 0 paid |
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| Location: |
Sydney, NSW, Australia
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| Member Since: |
October 20, 2008 |
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| Invited Users: |
There are no invited users
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Description
I just need the code for simulator, I will do the testing for the following:
There are 10 hosts connected to the LAN. Flows of packets from all hosts that go
through the gateway are queued in one incoming buffer. All hosts generate packets at
the same rate. Packet lengths are exponentially distributed with a mean of 1000 octets.
The outgoing link capacity is 10 Mbps.
Build a simulator for each of the following cases:
1. Assume that packets from each host arrive according to a Poisson process
independently of other hosts. Find the minimum gateway buffer size (in octets) to
ensure a packet loss probability of not more than 0.001 at the gateway for any
utilisation that does not exceed 90%.
2. For the gateway buffer size found in question 1, plot the packet loss probability
for packet arrival rates of ©p=60, 80, 100, 120 packets/second per host. What
conclusions can you draw? Explain.
3. Now, assume that some of the hosts exhibit a Poisson batch arrival process,
instead of a simple Poisson packet arrival. In a Poisson batch arrival process, the
arrival events are distributed as in a Poisson process, but each arrival carries a
batch of several packets at once (instead of just one packet). The packets in the
batch join the queue if the queue is not full; it is possible that only some of the
packets in a batch will join the queue, and the rest of the batch will be lost.
Assume that the Poisson arrival rate is ©b=10 batches/second per host, and the
batch size is distributed geometrically with a mean of ©p/©b, where ©p takes the
same values as before (60, 80, 100, 120 packets/second). The packet length
distribution is the same as before.
For each of the following cases, using the buffer size found in question 1, plot the
packet loss probability for the “batch arrival” hosts and the “single-packet arrival”
hosts, for the different values of ©p:
a. if one host has batch arrivals, and all other 9 hosts have packet arrivals;
b. if two hosts have batch arrivals, and all other 8 hosts have packet arrivals;
c. if all 10 hosts have batch arrivals.
What conclusions can you draw? Explain.
4. This question focuses on case 3a above (one host with batch arrivals).
We would now like to provide a fair access for all hosts, and apply the fair buffer
allocation (FBA) scheme for this purpose (see lecture on TCP over ATM, or
Stallings pp. 347-350). Use the same buffer size obtained in question 1, with the
parameter R at 75% of the buffer capacity and Z=0.95. Find and plot the mean
packet delay in the gateway as a function of gateway occupancy. Draw a separate
graph for the “batch arrivals” host and for the other hosts. In the same manner,
find and plot the packet loss probability. What conclusions can you draw about the
effectiveness of FBA? Explain.
Reminder
You may not start working in this and any request before
your bid is accepted. Users who violate this policy
may have their accounts permanently suspended.
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