ASAP: a MAC protocol for dense and time-constrained RFID systems
EURASIP Journal on Wireless Communications and Networking
RFID-based networks: exploiting diversity and redundancy
ACM SIGMOBILE Mobile Computing and Communications Review
Performance-effective and low-complexity redundant reader detection in wireless RFID networks
EURASIP Journal on Wireless Communications and Networking - Intelligent Systems for Future Generation Wireless Networks
Efficient tag detection in RFID systems
Journal of Parallel and Distributed Computing
AIC'08 Proceedings of the 8th conference on Applied informatics and communications
Alleviating reader collision problem in mobile RFID networks
Personal and Ubiquitous Computing
A Priority Based Transaction mechanism towards high reliable RFID services
International Journal of Ad Hoc and Ubiquitous Computing
An efficient MAC protocol for throughput enhancement in dense RFID system
ISWPC'09 Proceedings of the 4th international conference on Wireless pervasive computing
Key issues of RFID reader network system
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Leveraging spatio-temporal redundancy for RFID data cleansing
Proceedings of the 2010 ACM SIGMOD International Conference on Management of data
On alleviating reader collisions towards high efficient RFID systems
ATC'10 Proceedings of the 7th international conference on Autonomic and trusted computing
Bit level synchronized MAC protocol for multireader RFID networks
EURASIP Journal on Wireless Communications and Networking
On Object Identification Reliability Using RFID
Mobile Networks and Applications
Probabilistic DCS: An RFID reader-to-reader anti-collision protocol
Journal of Network and Computer Applications
E2MAC: An energy efficient MAC for RFID-enhanced wireless sensor networks
Pervasive and Mobile Computing
Low Access Delay Anti-Collision Algorithm for Readers in Passive RFID Systems
Wireless Personal Communications: An International Journal
A tag prediction anti-collision algorithm using extra bits for RFID tag identification
International Journal of Ad Hoc and Ubiquitous Computing
RFID reader anti-collision algorithm using adaptive hierarchical artificial immune system
Expert Systems with Applications: An International Journal
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HiQ is a hierarchical, online learning algorithm that finds dynamic solutions to the Reader Collision Problem in RFID systems. When the transmissions from one reader interfere with the operation of another reader, a reader collision occurs. The objective of the Reader Collision Problem is to minimize the reader collisions experienced by RFID readers while using the minimum number of frequencies and using the minimum total time for all readers to communicate successfully. HiQ attempts to minimize reader collisions by learning the collision patterns of the readers and by effectively assigning frequencies over time to ensure neighboring readers do not experience collisions from one another. HiQ is arranged hierarchically with distributed, local control. The algorithm is based on a type of reinforcement learning called Q-learning, which is used to determine frequency and time assignments. Through repeated interaction with the system, Q-learning attempts to discover an optimum frequency assignment over time. We show that HiQ finds optimal or near optimal solutions to the Reader Collision Problem.