Achieving MAC layer fairness in wireless packet networks
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Distributed fair scheduling in a wireless LAN
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Dynamic tuning of the IEEE 802.11 protocol to achieve a theoretical throughput limit
IEEE/ACM Transactions on Networking (TON)
Receiver-initiated collision avoidance in wireless networks
Wireless Networks - Selected Papers from Mobicom'99
Asynchronous Multimedia Multihop Wireless Networks
INFOCOM '97 Proceedings of the INFOCOM '97. Sixteenth Annual Joint Conference of the IEEE Computer and Communications Societies. Driving the Information Revolution
Evaluation of Quality of Service Schemes for IEEE 802.11 Wireless LANs
LCN '01 Proceedings of the 26th Annual IEEE Conference on Local Computer Networks
A survey of quality of service in IEEE 802.11 networks
IEEE Wireless Communications
Protocol design and throughput analysis of frequency-agile multi-channel medium access control
IEEE Transactions on Wireless Communications
Taking the next step beyond spectrum auctions: open spectrum access
IEEE Communications Magazine
Spectrum pooling: an innovative strategy for the enhancement of spectrum efficiency
IEEE Communications Magazine
Quality-of-service in ad hoc carrier sense multiple access wireless networks
IEEE Journal on Selected Areas in Communications
Performance analysis of the IEEE 802.11 distributed coordination function
IEEE Journal on Selected Areas in Communications
Supporting service differentiation in wireless packet networks using distributed control
IEEE Journal on Selected Areas in Communications
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
Dynamic spectrum access in open spectrum wireless networks
IEEE Journal on Selected Areas in Communications
A new adaptive MAC protocol with QoS support based on IEEE 802.11 in ad hoc networks
Computers and Electrical Engineering
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In this paper, we consider an ad hoc network overlaying a legacy time-division multiple access (TDMA) system. This kind of ad hoc and infrastructure-based coexisting architecture can have an important application for the future cognitive radio (CR) network. To establish an overlaying ad hoc network in the presence of primary users, the medium access control (MAC) protocol shall achieve high spectrum utilization, avoid interfering the primary user and establish the link quickly. To this end, we propose four enhanced mechanisms for the carrier sense multiple access with collision avoidance (CSMA/CA) MAC protocol: (1) a neighbor list establishment mechanism for recognizing spectrum usage opportunities, (2) a set of contention resolution methods to reduce the collision and delay variance, (3) an invited reservation procedure for meeting the delay requirements of real-time traffic, and (4) a distributed frame synchronization mechanism for coordinating transmission without a centralized controller. Compared to the legacy IEEE 802.11 MAC protocol, the proposed CSMA/CA MAC protocol enhancement can improve the system throughput by 50% through analysis and NS-2 simulations, while keeping the dropping rate lower than 2% for delay-sensitive traffic. Furthermore, the standard deviation of the access delay is reduced by five times. With these QoS enhanced mechanisms, the proposed cognitive CSMA/CA MAC protocol can allow an ad hoc network to coexist with the legacy TDMA system.