Compare different types of transmission errors that can occur in wireless and wired networks
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Packet loss due to congestion:
Congestion may appear from time to time even in carefully designed
networks. The packets buffers of a router are filled and the router can not
forward the packets fast enough because the sum of the input rates of
packets destined for one output link is higher than the capacity of the
output link. The only thing a router can do in this situation is to drop
packets. This kind of packet loss can occur in both wireless and wired
networks.
Packet loss due to random loss
The random loss is due to bit corruption and link errors. In wired network,
the transmission error rate (10-10
-10-12) is generally very low so that it can
be neglected. However it is not true for the wireless network (10-2
-10-4
).
Packet loss due to burst loss
The burst loss may be initiated by signal fading. Prolonged uncontrolled
channel interference can lead to correlated packet losses. Yet it generally
occurs over a very short duration, leading a loss of several consecutive
segments at a time.
In an infrastructure network, when a mobile host is moved from the
coverage of a base station to another, all subsequent communications are
routed via the new base station and the handoff process is completed.
However the packet may be lost as they are routed to the old station during
the process of the handoff. Therefore a handoff event can initiate a burst
loss event.
In ad hoc network, same situation can happen. During to the mobility of
the mobile host, the network connectivity and the network topology can
change. The transmission path for a traffic flow may be affected. Some
time is necessary to complete the rerouting process for the traffic flow.
Thus some packet belong to the same traffic flow may be lost during the
process. As a result, a burst loss event occurs in this case.
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