Assume that traffic is assigned four different priority levels taking into account real-time and handoff traffic. How can you handle such traffic while supporting mobility?

Question

What will be an ideal response?

Answer 1

If we have a wireless system in which the traffic has four priority levels, then
essentially we have to take mobility management into account in the design phase of such a system. The traffic could be real-time or non-real time. In general, real-time traffic has a higher priority than non-real time traffic. We basically have to do the handoff management in an efficient fashion for such a system with four priorities. In other words, the handoff process will be service dependent.
Channel reservation
One design consideration in this system would be the reservation of channels. We can give priority reservation to traffic with high priority so that a fixed number of channels are always reserved for such high priority traffic requests. We would have queues for all the priority level traffic and the particular priority traffic request would wait in its assigned queue. The number of channels reserved could depend on the actual traffic priorities assigned. Therefore, we could reserve channels for each of the four priorities. We could also use a preemptive scheme in which a higher priority request would have the right to preempt the execution of a lower priority request. The preempted low priority request would then resume execution at a later stage. The higher priority request would preempt only if it finds no channel available. The preempted request would also have to be stored in a queue so that it can be executed later. Additionally, we could also consider the transmission delay. Ideally, we would like to minimize the delay for the traffic request that has the highest priority as compared to a request with a lower priority. Hence, high priority requests need to be executed as fast as possible in such a network.