Mobile computing coe 446 network operation
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Mobile Computing COE 446 Network Operation. Tarek Sheltami KFUPM CCSE COE http://faculty.kfupm.edu.sa/coe/tarek/coe446.htm. Principles of Wireless Networks K. Pahlavan and P. Krishnamurth. Outline. Handoff Management Architectural Issues in Handoff Handoff Decision Time Algorithms

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Mobile Computing COE 446 Network Operation

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Mobile computing coe 446 network operation

Mobile Computing COE 446Network Operation

Tarek Sheltami

KFUPM

CCSE

COE

http://faculty.kfupm.edu.sa/coe/tarek/coe446.htm

Principles of Wireless Networks

K. Pahlavan and P. Krishnamurth


Outline

Outline

  • Handoff Management

    • Architectural Issues in Handoff

    • Handoff Decision Time Algorithms

    • Types of Handoffs


Mobile management

Mobile Management

Handoff Management

  • Architectural Issues in Handoff

  • Set of protocols to notify all related entities of a particular connection that a handoff has been executed and the connection has to be redefined

  • In voice network, MT selects the BS that is serving its location

  • When an MT moves from one point of attachment to another, the old serving point of attachment has to be informed about the change (dissociation)

  • Other network components involved in routing mechanism have to be aware of the handoff in order to seamlessly continue the ongoing connection of the call


Mobile management1

Mobile Management

  • Handoff are classified according to the connection creation

    • Seamless handoff and hard handoff

  • Handoffs are classified into:

    • Network Controlled Handoff (NCHO)

    • Mobile Controlled Handoff (MCHO)

    • Mobile Assisted Handoff (MAHO)


Mobile computing coe 446 network operation

(Cellular Digital Packet Data)


Mobile management2

Mobile Management

Handoff Management

  • Handoff Decision Time Algorithms

  • Traditional handoff algorithms are based on the RSS. Some of them are as follows:

    • RSS

    • RSS plus Threshold

    • RSS plus Hysteresis

    • RSS, Hysteresis and Threshold

    • Algorithms plus Dwell Timer


Mobile computing coe 446 network operation

Example

  • A mobile terminal is receiving signals from 3 BSs at the handoff region.

  • The handoff decision is made at each sampling time according to the below

  • table. The MT is initially connected with BS1.

  • Show the handoff transitions between BSs for each of the following

  • algorithms:

  • RSS

  • RSS + -60 dBm Threshold

  • RSS + Hysteresis 10 dBm

  • RSS + Hsyteresis 5 dBm + -55 dBm Threshold


Mobile management3

Mobile Management

Handoff Management

  • Handoff Decision Time Algorithms

  • The performance of handoff algorithms measures have been considered such as call blocking probability, handoff blocking probability, delay between handoff request and execution, and call dropping probability

  • Handoff rate is related to the ping-pong effect and algorithms are designed to minimize the number of unnecessary handoffs


Mobile management4

Mobile Management

Generic Handoff Management Process

  • Handoff decision is made and initiated

  • MT register with new visiting database via handoff messages

  • New visiting database communicates with the home database to get the subscriber profile and for authentication

  • Home database responds to the new visiting database with authentication of the MT

  • Home database sends messages to the old visiting database to cancel registration

  • The old visiting database flushes or redirects to the new visiting database and removes the MT from its list


Mobile management5

Mobile Management

Handoff Management

  • Types of Handoffs:

    • Intracell, two channels

    • Intercellintradomain handoff, between two BSs associated with the same database

    • Intercellinterdomain handoff, between two BSs with different database


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