Medium access with adaptive relay selection in cooperative wireless networks We specify and evaluate a protocol for cooperative relay communications in wireless networks targeted for low-budget and energy-constrained off-the-shelf hardware.

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6. Medium Access with Adaptive Relay Selection in
Cooperative Wireless Networks
@LeMeniz Infotech

7. Abstract
We specify and evaluate a protocol for cooperative relay communications
in wireless networks targeted for low-budget and energy-constrained off-the-
shelf hardware. The protocol located at the Medium Access Control
(MAC) layer integrates radio resource reservation, relay selection, and
packet flow. Performance is evaluated with different parameters, such as
node density, channel coherence time, and data packet size.
Higher network-wide reliability and throughput compared to
noncooperative protocols can be achieved in dense networks and unreliable
channels. At the same time, throughput does not degrade in
sparse networks or good channel conditions.

8. Introduction
Many studies focus on information theoretical and physical layer aspects,
such as link capacity, coding, and relay positioning in simple scenarios often
with only three nodes The study of cooperative diversity in large networks
and the design of link-layer protocols enabling the use of relays has found
less attention. We believe that cooperative diversity will not be
implemented in practice until protocols supporting the physical layer to
exploit the benefits of diversity are designed and properly specified. To this
end, we focus on the design of Medium Access Control (MAC) protocols for
cooperative relay systems and specify design blocks of a MAC protocol that
can be readily incorporated into existing wireless systems.

9. EXISTING SYSTEM
The challenge of designing a cooperative MAC protocol is that the overhead
caused by setting up cooperation — relay selection and other signaling
traffic — should not consume the provided benefit. It is essential that nodes
follow certain principles in transmitting packets such that collisions are
avoided if possible. Similarly, all signaling traffic of cooperative diversity
have to adhere to the medium access rules. Setup and execution of
cooperative diversity must be fast enough to react to the dynamics of the
channel. Relay selection might also need access to information held by the
physical layer, e.g., residual battery, received signal-to-noise ratio.

10. Disadvantage
• Can neither react to fast changing channels nor to node
movements.
• Transceivers are infeasible due to their costs, energy
consumption, or size constraints.
• Select relays based on information from the past.

11. PROPOSED SYSTEM
CoRe-MAC (Cooperative Relaying Medium Access Control) protocol which
builds on Carrier Sensing Multiple Access with Collision Avoidance (CSMA/CA)
with RTS (Request-To-Send) and CTS (Clear-To-Send) handshake and extends
the mechanisms for handling transmission failures by space-time diverse
channels. We pay special attention to the feasibility for low-budget off-the-shelf
hardware and its backward compatibility to CSMA/CA.
This enables the operation of heterogeneous networks, where some nodes use
CoRe-MAC and others CSMA/CA, and hence facilitates integration of CoRe-MAC
in existing networks. Unless otherwise noted, CSMA/CA refers to CSMA/CA
with RTS and CTS. Moreover, we focus on keeping the overhead of CoRe-MAC
compared to CSMA/CA at a minimum for good channel conditions. In CoRe-
MAC, the destination of a transmission attempt decides to enable cooperation
based on the quality of its link to the source (see cooperation on demand). The
overhead of CoRe-MAC is low, even if a destination enables cooperation and
direct transmission succeeds.

12. Advantages
• Builds on CSMA/CA and extends the mechanisms for
handling transmission failures by space/time diverse
channels.
• Easier integration of CoRe-MAC in existing networks
• The cooperation cost low via relay selection on demand
with early retreat and a prioritized candidate set.

13. Reference
A. Sendonaris, E. Erkip, and B. Aazhang, “User cooperation
diversity – Part I: System description,” IEEE Trans. Commun.,
vol. 51, no. 11, pp. 1927–1938, Nov. 2003.

14. Hardware Specification
Processor : Any Processor above 500 MHz.
Ram : 128Mb.
Hard Disk : 10 Gb.
Compact Disk : 650 Mb.
Input device : Standard Keyboard and Mouse.
Output device : VGA and High Resolution Monitor.

15. Software Specification
Operating System : Windows Family.
Programming Language : ASP.NET, C#.Net.
Database : SQL Server 2005

16. Medium Access with Adaptive Relay Selection in
Cooperative Wireless Networks
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