If preemption is allowed in Problem P18.4, how would you do the scheduling and what are the relative advantages and disadvantages?
What will be an ideal response?
In a preemptive scheme, a traffic request with a higher priority can preempt a request with a lower priority. The execution of the lower priority request is halted and the higher priority request is allowed to execute if it finds no channel available. Queues may be present for both types of requests. The lower priority request resumes execution at a later time.
Advantages:
(a) Probability of packet loss is minimized for real-time transmission as such a request can be transferred from the queue of the current BS to that of another.
(b) High priority requests that otherwise not be allowed to execute are
entertained.
(c) Forced termination probability of real-time requests is decreased.
Disadvantages:
(a) Tough to determine the level of priority calls that is to be preempted. Need to de.ne a fixed level of priority for preemption.
(b) Need to reserve queues for the requests that are preempted so that they can resume execution later.
You might also like to view...
A(n) ____________________ spring is made of a long, flat strip of spring steel or composite fiber rolled at both ends to accept a pressed-fit rubber insulating bushing.
Fill in the blank(s) with the appropriate word(s).
?What are some types of materials that can be cut using one of the related cutting processes?
A. ?glass and plastic B. ?printed circuit boards C. ?cloth and fiberglass insulation D. ?All of the above
? Identify and state the historical significance of self-determination.
What will be an ideal response?
Weld joints are visually inspected to ensure that a quality weld is produced and that all _____ are satisfied
a. time lines b. code requirements c. production quotas d. production criteria