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5.6 Mobile Ad Hoc Networks

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5.6 Mobile Ad Hoc Networks Ad hoc network does not have any preexisting centralized server nodes to perform packet routing, directory assistance, service discovery, resource management, and signaling.

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5.6 Mobile Ad Hoc Networks

  • Ad hoc network does not have any preexisting centralized server nodes to perform packet routing, directory assistance, service discovery, resource management, and signaling.
  • MANET is defined as including both fully mobile multihop ad hoc networks and hybrid ad hoc networks.
  • A variety of potential applications
    • Rescue operations and disaster recovery
    • Military operations in a battlefield
    • Conferences and events
    • Remote monitoring and surveillance system
    • Vehicular communication system

Mobile Networking Challenges


5.6.1 MANET Categories

  • A vast of research effort in the domain of mobile computing.
    • Topology control
    • Routing
    • Service discovery and access
    • Data acquisition and aggregation
    • Security and privacy
  • 5.6.2 Topology Control in a MANET
  • Two key issues of topology control in a MANET
    • 1. neighbor discovery
    • 2. network organization
  • The basic idea is described as follows: Given a transmission graph that models node connectivity of a MANET, find a distributed algorithm that generates a subgraph comprised of optimal paths between any nodes with respect to network throughput and power consumption.

Mobile Networking Challenges


5.6.3 Routing in MANET

Routing protocols for MANET












Mobile Networking Challenges


5.6.4 Service Discovery

  • To a mobile node, a MANET is a virtual server that provides a number of services.
    • Network services, such as point-to-point or group communication, mobile access proxying, network performance monitoring, or power alert.
    • Computational services, such as distributed job scheduling, distributed storage, or distributed caching.
    • Application services, such as printing, web caching, or web services.

Mobile Networking Challenges


Table 5.4 Service Discovery Protocols

Mobile Networking Challenges


5.7 Quality of Service in Mobile Computing

  • Quality of service (QoS) in a network refers to the capability of the network to prioritize traffic and guarantee performance of data communication.
  • 5.7.1 An Overview of QoS
  • Key elements of a QoS provisioning mechanism are listed as follows:
    • Traffic classification and marking - the process of classifying traffic into a set of classes
    • Traffic policing - the process of discarding traffic that exceeds a profile
    • Traffic scheduling and shaping - the process of controlling multiple queues and possibly delaying or dropping some packets according of some rules
    • Resource reservation and signaling protocols - the process of explicitly reserving and allocating network resources such as bandwidth for specific traffic
    • Admission control - the process of deciding if a packet stream should be allowed to enter a network

Mobile Networking Challenges


5.7.2 End-to-End QoS Support in Mobile Computing

  • QoS provision in wireless networks is performed in one of two ways: resource reservation before traffic begins to flow or per-hop differentiated treatment while the traffic is flowing in the network
  • Some fundamental differences between wireless and wired networks have created an array of challenging issues in providing QoS in wireless networks and interconnected wireless systems.
    • Link bandwidth on QoS
    • Link quality on QoS
    • Mobility on QoS
    • Mobile devices on QoS

Mobile Networking Challenges