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Related Experiment Videos

Medium Access Control for Opportunistic Concurrent Transmissions under Shadowing Channels.

In Keun Son¹, Shiwen Mao, Seung Min Hur

¹Department of Electrical and Computer Engineering, Auburn University, Auburn, AL 36849, USA;

Sensors (Basel, Switzerland)

|March 13, 2012

Summary

This study enhances wireless network performance by addressing the exposed terminal problem in multi-hop networks. Our modified IEEE 802.11 MAC protocol improves throughput and reduces delay, even with log-normal shadowing.

Keywords:

IEEE 802.11 MAC Log-normal shadowing exposed terminal media access control multi-hop wireless networks

Related Experiment Videos

Area of Science:

Computer Science
Electrical Engineering
Wireless Communication Networks

Background:

The exposed terminal problem hinders efficient concurrent transmissions in multi-hop wireless networks.
Log-normal shadowing channels introduce significant randomness, complicating Medium Access Control (MAC) protocol design.
Existing IEEE 802.11 MAC protocols struggle to effectively manage transmissions under these conditions.

Purpose of the Study:

To propose and evaluate a MAC protocol extension that mitigates the exposed terminal effect in multi-hop wireless networks.
To improve network throughput and reduce delay performance in the presence of log-normal shadowing.
To demonstrate the benefits of incorporating channel randomness considerations into MAC protocol design.

Main Methods:

An extension of the IEEE 802.11 MAC protocol was developed, incorporating node location information.
The proposed protocol schedules concurrent transmissions, specifically accounting for log-normal shadowing effects.
Network performance was simulated using ns-2 under various network topologies and channel conditions.

Main Results:

The proposed MAC protocol extension significantly improved throughput compared to the standard IEEE 802.11 MAC.
Noticeable reductions in network delay were observed with the enhanced protocol.
Simulations confirmed the protocol's effectiveness across diverse network configurations and shadowing levels.

Conclusions:

The proposed MAC protocol effectively alleviates the exposed terminal problem in multi-hop wireless networks.
Considering channel randomness, like log-normal shadowing, is crucial for optimal MAC protocol design.
The developed protocol offers a viable solution for enhancing wireless network efficiency and performance.