Bandwidth Management Framework for IP based Mobile Ad Hoc Networks Khalid Iqbal (41152190)...
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Transcript of Bandwidth Management Framework for IP based Mobile Ad Hoc Networks Khalid Iqbal (41152190)...
Bandwidth Management Framework
forIP based Mobile Ad Hoc Networks
Khalid Iqbal (41152190)Supervisor: Dr. Rajan Shankaran
ITEC810
June 05, 2009
Mobile Ad Hoc Networks 2
Problem Statement
“Incorporating scalable bandwidth management scheme in an IP
based mobile ad hoc network environment”
Mobile Ad Hoc Networks 3
Agenda IP based Mobile Ad Hoc Network MANET Applications Quality of Service (QoS) MANET Routing Protocols QoS Models Existing QoS models in MANET
environment QoS models designed for MANETs Ad Hoc Extensions for ASAP
IP based Mobile Ad Hoc Networks (MANET)
Collection of wireless nodes Connected through wireless links Free to move, Self-configuring No pre-existing infrastructure Dynamic topology Distributed operations
Mobile Ad Hoc Networks 4
Mobile Ad Hoc Networks 6
MANET Applications
Military battlefieldCommercial Level
Disaster relief efforts (flood, earthquake)
Local Level Class room network Home network
Mobile Ad Hoc Networks 7
Quality of Service (QoS) Capability of a network to provide better services
to selected network traffic. Need for QoS in MANETs:
Bandwidth management Resource management Application requirements
Applications QoS Requirements
Email, File Transfer Very tolerant of delay: low
Real Audio Very sensitive to delay: High
Streaming Video Very sensitive to delay: High
Mobile Ad Hoc Networks 8
MANET Routing Protocols Proactive or Table-driven protocols
Maintain routing information Waste of bandwidth Immediate availability of routing information
Reactive or On-demand protocols No routing table Path calculation before transmission Less overhead, slower
Hybrid protocols Combination of both Zone organization Within zone proactive scheme Outside reactive scheme
QoS Models
Integrated Services (IntServ) Management and packet scheduling on a
per flow basis Difficult and costly for the routers
Differentiated Services (DiffServ) QoS control on a service class basis QoS is invoked on packet-by-packet basis Feasible and cost-effective
Mobile Ad Hoc Networks 9
Mobile Ad Hoc Networks 12
Existing QoS models in MANET environment (Limitations)
IntServ in MANETs Scalability Protocol phases
Connection establishment, maintenance, teardown
DiffServ in MANETs SLA
traffic conditioning rules, placed at the nodes
Ambiguous core network
QoS models for MANETs
Flexible QoS Model for Mobile Ad Hoc Network (FQMM) Hybrid per-flow and per-class provisioning Nodes have dynamic role
FQMM Limitations Scalability problem Fail to satisfy hard QoS requirements.
Mobile Ad Hoc Networks 13
QoS models for MANETs (Cont.)
Adaptive Reservation and Pre-allocation QoS Architecture (ASAP)
For Infrastructure based networks Soft/Hard Reservation QoS Monitoring
Periodic investigation more frequent monitoring, if the network is unstable
Mobile Ad Hoc Networks 14
Limitations of ASAP
Flow Restoration Problem Flow restoration can be quite long Detecting a missing reservation.
Reverse Path Problem Outdated paths unsymmetrical paths
Mobile Ad Hoc Networks 15
Mobile Ad Hoc Networks 16
Solutions to address ASAP problems
Local Repair Dynamic Virtual Path Flexible Timing Control Congestion Control
Solutions to address ASAP problems (Cont..) Local Repair
Flow path broken because of dynamic topology No QoS guarantee from broken point to
destination Quick repairing mechanism local repair triggered by a soft reservation
message Upon receiving a SR message, node reserves
some bandwidth Dynamic Virtual Path
Unsymmetrical routesMobile Ad Hoc Networks 17
Solutions to address ASAP problems (Cont..)
Flexible Timing Control SR (Soft Reservation) sending interval and the
soft state time-out period. Stable network - Large SR interval Coherent; SR and soft state time-out period too large soft state time-out will keep
reservations on
Mobile Ad Hoc Networks 18
Solutions to address ASAP problems (Cont..)
Congestion Control Queue length is not a valid indication Congestion detection by monitoring the
wireless channel Approximation of the bandwidth usage Increase or decrease transmission throughput
Mobile Ad Hoc Networks 19