Question$3$: Handoff $(7$ Marks$)$

a$)$ What is handoff in the context of mobile communication? $(1$ Marks$)$

b$)$ What criteria is used for handoff in modern mobile communication systems? $(1$

Marks$)$

c$)$ What is the primary reason for implementing handoff in mobile communication

systems? $(2$ Marks$)$

d$)$ Examine the

I. Which of the scenarios above represent a proper handoff situation, $($a$)$ or $($b$)?(1$

Mark$)$

II$.$ In scenario $($a$),$ what happens when the received signal level reaches the level at point

B $($indicated by the circle$)?(1$ Mark$)$

III. What does the point indicated by a black star in scenario $($b$)$ represents? $(1$ Mark$)$