Mobile Cellular Systems - Alak Roy

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Example Receiver Threshold 30
Handoff • What happens when a user is mobile? - Especially when crossing a cell boundary while continuing the call. • Handoff strategy is invoked. – Find a new base station, allocating new voice and control channel of the new BS – Process handoff – higher priority over new call invocation, when allocating unused channels in a cell – Optimal received signal level to initiate a handoff. – Delta =Phandoff – Pusable , should not be too small or large – Large -> unnecessary handoff, small->insufficient time to complete handoff before a call is lost due to weak signal – Dropped call also due to excessive delay by MSC (loads, no 31 channels free in nearby cell)
Page 1 and 2: SLIDE #2.1 Mobile Cellular Systems
Page 3 and 4: Cellular Implementations (Gs) • 1
Page 5 and 6: Cellular Implementations(Gs) • 4G
Page 7 and 8: Frequency Division Duplex (FDD) mob
Page 9 and 10: Number of User Channels in AMPS •
Page 11 and 12: Cellular Architecture MSC PSTN MS B
Page 13 and 14: Hexagonal Cells 13
Page 15: Example: K = 7 15
Page 18 and 19: Nyquist Bandwidth (for noiseless ch
Page 20 and 21: Signal-to-Noise Ratio • Ratio of
Page 22 and 23: Example of Nyquist and Shannon Form
Page 24 and 25: 24 HANDOFF IN CELLULAR SYSTEMS
Page 26 and 27: Handoff Decisions • Usually based
Page 28 and 29: Traditional Handoff Algorithms Choo
Page 32 and 33: Who and When • Who initiates hand
Page 34 and 35: Types of Handoff • Hard handoff -
Page 36 and 37: High priority for Handoff • In no
Page 38 and 39: Queuing Handoff Calls (QHC) • Que
Page 40 and 41: Queuing Handoff Calls • QHC can b
Page 42: Other practical problems with hando

Mobile Cellular Systems - Alak Roy

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