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A Testbed for Wireless Ad hoc Networks. Telecommunications Research Lab Queen’s University. Wireless Ad Hoc Testbed (objectives). Facilitate the implementation of applications for multi-hop ad hoc networks.

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A testbed for wireless ad hoc networks

A Testbed for Wireless Ad hoc Networks

Telecommunications Research Lab

Queen’s University

October 24, 2002

Wireless ad hoc testbed objectives
Wireless Ad Hoc Testbed (objectives)

  • Facilitate the implementation of applications for multi-hop ad hoc networks.

  • Develop protocols for multi-hop ad hoc networks equipped with IEEE 802.11 (wireless LAN) interfaces.

  • Develop and evaluate alternate techniques for interworking wireless LANs and ad hoc networks.

  • Evaluate the performance of TCP/IP over ad hoc networks.

October 24, 2002

Wireless ad hoc testbed devices
Wireless Ad Hoc Testbed (Devices)

  • Dell Notebooks

  • Sony Vaio Notebooks

  • Compaq iPAQ handheld PC’s

  • Intel Pro Wireless LAN Cards

  • Intel Pro Wireless Access Points

October 24, 2002

Wireless lans default
Wireless LANs (default)

  • Support for

  • BSS and ESS.

  • Single-hop

  • communication

  • with AP.

Network Backbone

October 24, 2002

Ad hoc mode peer to peer
Ad hoc mode (peer-to-peer)

  • Independent Basic Service Set (IBSS).

  • No support for multi-hop connectivity.

  • Single Code Division Multiple Access (CDMA).

October 24, 2002

Multi hop ad hoc mode
Multi hop Ad hoc mode

Packet Source

Packet Recipient

  • Wireless range is no longer a limitation.

  • Destination must be part of at least one connected

  • graph consisting of source.

October 24, 2002

Multi hop forwarding architecture
Multi-hop Forwarding Architecture

  • Well-defined SAPs for

  • use by applications.

  • Packet processor is the

  • multi-hop enabler.

  • Works with existing

  • TCP/IP suites.

  • Compatible with all MAC

  • schemes (past – 802.3,

  • present – 802.11, future)

Application Layer

Thin Layer

Packet Processor




Medium Access


October 24, 2002

Packet processor
Packet Processor

Message, Destination

Incoming RREQs

Message Forwarding





RREQ Generator




Open Multi-thread sockets


Incoming messages or RREPs

October 24, 2002

Block diagram description
Block Diagram Description

  • Message Forwarding :

    • Passes the user input to the packet processor.

  • Dispatcher:

    • Processes incoming RREQs, RREPs, and data.

    • Passes incoming messages destined to this specific station.

    • Decides if a RREQ, a RREP, or a message, needs to be forwarded or not.

  • Transmitter:

    • Sends RREP and data messages to the next MT in the route record.

October 24, 2002

Block diagram the details
Block Diagram: The Details

  • RREQ Generator:

    • Generates RREQ packets and forwards them to the broadcast entity.

  • Broadcast:

    • Broadcasts the generated RREQ packets to neighbors.

  • Listener or Receiver:

    • Opens a multi-thread socket and listens for incoming RREPs and messages.

    • Passes incoming messages and RREPs to the packet processor.

    • Simultaneous update of routing table entries enhances receipt efficiency.

October 24, 2002


  • Allows interconnection between wireless ad hoc networks and infrastructure-based wired and wireless.

  • Some MTs may be equipped with multiple interfaces one of which connects it to a Distribution System (DS).

    • 802.3 / ESS / 2.5G / 3G interface.

    • Software radios.

October 24, 2002

Interworking illustration
Interworking Illustration

October 24, 2002

Interworking paradigms
Interworking Paradigms

  • Interworking is strictly dependent upon the routing protocol, but service discovery is required.

  • Two types of service discovery:

    • Proactive service discovery

    • Reactive service discovery

  • Choice of service provided may be:

    • Network-based

    • Service-based

    • Energy-based

    • Etc.

  • October 24, 2002

    Multi hop applications
    Multi-hop Applications

    • We have successfully developed and implemented a multi-player chatting software over a multi-hop ad hoc network architecture. The software uses the packet processor layer to route data packets across the network.

    • We have successfully developed a multi-player distributed gaming software over multi-hop wireless ad hoc networks.

    October 24, 2002