MANET:%20Introduction

1
MANET Introduction

• Reference Mobile Ad hoc Networking (MANET)
  Routing Protocol Performance Issues and
  Evaluation Considerations S. Corson and J.
  Macker, RFC 2501, 1999. (rfc2501.htm)

2
Introduction

• Mobile Ad hoc Networking (MANET)
• To support robust and efficient operation in
  mobile wireless networks by incorporating routing
  functionality into mobile nodes
• Such networks are envisioned to have dynamic,
  sometimes rapidly-changing, random, multihop
  topologies which are likely composed of
  relatively bandwidth-constrained wireless links
• Goal to extend mobility into the realm of
  autonomous, mobile, wireless domains, where a set
  of nodes which may be combined routers and
  hosts themselves form the network routing
  infrastructure in an ad hoc fashion

3
Applications

• Industrial and commercial applications involving
  cooperative mobile data exchange
• Wearable computing and communications
• Combined with satellite-based information
  delivery
• Provide an extremely flexible method for
  establishing communications for
  fire/safety/rescue operations or other scenarios
  requiring rapidly-deployable communications with
  survivable, efficient dynamic networking

4
Characteristics

• MANET
• Autonomous system of mobile node
• Nodes are equipped with wireless transmitters and
  receivers using antennas (omni-directional or
  highly directional, etc)
• Characteristics
• Dynamic topologies
• Bandwidth-constrained variable capacity links
• Energy-constrained operations
• Limited physical security
• The need for scalability

5
Routing Issues

• Qualitative properties of routing protocols
• Distributed operation
• Loop-freedom
• Demand-based operation
• Proactive operation
• Security
• Sleep period operation
• Unidirectional link support

6
Routing Issues (cont)

• Quantitative metrics
• End-to-end data throughput and delay
• Route Acquisition Time
• Percentage out-of-order delivery
• Efficiency
• Average number of data bits transmitted/data bit
  delivered
• Average number of control bits transmitted/data
  bit delivered
• Average number of control and data packets
  transmitted/data packet delivered

7
Routing Issues (cont)

• Networking context
• Network size (number of nodes)
• Network connectivity (average number of neighbors
  of a node)
• Topological rate of change
• Link capacity
• Fraction of unidirectional links
• Traffic patterns
• Mobility patterns
• Fraction and frequency of sleeping node