Data communications, computer networks and open systems (4th ed.)
Data communications, computer networks and open systems (4th ed.)
ALOHA packet system with and without slots and capture
ACM SIGCOMM Computer Communication Review
Service Discovery in Pervasive Computing Environments
IEEE Pervasive Computing
Exploiting the capture effect for collision detection and recovery
EmNets '05 Proceedings of the 2nd IEEE workshop on Embedded Networked Sensors
Network-assisted diversity for random access wireless networks
IEEE Transactions on Signal Processing
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Smart devices in the ubiquitous computing environment implement service/device discovery protocol that helps discovering each other and the services provided. As client device may receive multiple service description messages, it implements at its MAC layer a collision resolution mechanism to resolve the collision of messages. Effectiveness of collision resolution relies on the accuracy of detecting collision at the PHY layer. In this paper, we question the reliability of the conventional collision detection technique, which inaccuracy will affect the completeness of service/device discovery. Our analysis shows that capture effect and packet reception failure can cause failure in collision detection when the conventional technique is used. We suggest a detection technique that makes use of Manchester violation test. Implementation and evaluation of the proposed technique on some smart devices show its superiority over the conventional approach.