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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

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5 6 mobile ad hoc networks

  • 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 mobile ad hoc networks

  • 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 mobile ad hoc networks

5.6.3 Routing in MANET

Routing protocols for MANET

proactive

hybrid

reactive

DSR

AODV

DSDV

OLSR

2RP

TORA

FSR

ABR

Mobile Networking Challenges


5 6 mobile ad hoc networks

  • Table 5.2 Unicast Ad Hoc Routing Protocols

Mobile Networking Challenges


5 6 mobile ad hoc networks

  • Table 5.3 Location Based Ad Hoc Routing Protocols

Mobile Networking Challenges


5 6 mobile ad hoc networks

  • 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


5 6 mobile ad hoc networks

  • Table 5.4 Service Discovery Protocols

Mobile Networking Challenges


5 6 mobile ad hoc networks

  • 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 6 mobile ad hoc networks

  • 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


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