Shengjie Zhou

CSMA/CA MAC Protocol with Function of Monitoring based on Binary Tree Conflict Resolution for Cognitive Radio Networks

The CSMA/CA protocol is the most widely-compete agreement used by a network. Therefore, MAC layer of cognitive radio networks mostly use the CSMA/CA protocol to provide the competitive channel resources. Due to the unique characteristics and related needs of the cognitive radio networks, design their network protocol is a critical task. For its characteristics, design and implement a comprehensive CSMA/CA protocol, including arrival rate control, priority services, monitoring, conflict resolution and increased throughput; elaborated protocol model, system throughput and other parameters, demonstrates the correctness of the CSMA/CA protocol; comparison with other protocols, highlighting the advantages of the agreement.

Multichannel Dual Clocks Two-Dimensional Probability Random Access Protocol with Three-way Handshake Mechanism

Although two-dimensional probability random multiple access protocol can have a better control effect on the system, it features a single agreement, the practical application of the network is not strong. To solve the above problem, the model of multichannel dual clocks two-dimensional probability random access protocol with three-way handshake mechanism (DMTPTH protocol) is proposed. DMTPTH is based on the two-dimensional probability random access model, adding dual-clock, multichannel and three-way handshake mechanism, respectively, to achieve lower system idle rate, confirm the multiservice access and information transmission states. Theoretical analysis and simulation experiments show that the model can not only improve system throughput, but also achieve throughput by changing the two-dimensional probability adapt to different network environments, enhanced agreement practicality, and reliability.

Analysis of dual clock detection probability Random Multiple Access Protocol

In wireless sensor networks, traffic load moment node are changing ;the basis of CSMA protocol for idle channels not do effectively. To address this problem, analysis the lack of basic CSMA protocol, in order to improve the utilization of CSMA protocol idle, we come up with a new protocol which is the double clock P detection CSMA random multiple access protocol. Using the average cycle[1] approach to protocol analysis, and finally got the mathematical expression of system throughput. Final simulation results show the advantage of dual clock random probability of detection CSMA multiple access protocol , make full use of channels idle , and this agreement can remain relatively stable throughput at a high load.