Lecture17

Lecture17 - ECE-547 Introduction to Computer Communication...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Purdue University ECE ECE - - 547 547 Introduction to Computer Introduction to Computer Communication Networks Communication Networks Instructor: Instructor: Xiaojun Xiaojun Lin Lin Lecture Lecture 17 17
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Purdue University Residual service time Residual service time ¾ From (6) we have: () ( 1 )( ) Q ER EW ρ = 2 2 E λ τ = ¾ We can derive that 2 2(1 ) Q E = ¾ Hence,
Background image of page 2
Purdue University Priority Priority Queueing Queueing ¾ Priority classes are used for a variety of reasons. ¾ Signaling information ¾ Fault notification ¾ Routing change update ¾ Congestion information ¾ Different grades of service (voice, video, etc.) Vital packets that could get delayed by being behind other packets if no priority is assigned. ¾ Two types of priority queueing systems ¾ Non-preemptive ¾ Preemptive
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Purdue University Non Non - - preemptive priority queue preemptive priority queue r λ : : 1 r μ : : 1 ¾ r-classes of customers ¾ Arrival process of class k customer is Poisson with rate λ k ¾ Average service time of class k customers E( τ
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/06/2010 for the course ECE 547 taught by Professor Xiaojunlin during the Spring '09 term at Purdue.

Page1 / 8

Lecture17 - ECE-547 Introduction to Computer Communication...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online