tailieunhanh - Báo cáo hóa học: " Research Article A Multigroup Priority Queueing MAC Protocol for Wireless Networks with Multipacket Receptionc"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A Multigroup Priority Queueing MAC Protocol for Wireless Networks with Multipacket Reception | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 970842 12 pages doi 2008 970842 Research Article A Multigroup Priority Queueing MAC Protocol for Wireless Networks with Multipacket Reception Wen-Fang Yang Jwo-Yuh Wu Li-Chun Wang and Ta-Sung Lee Department of Communication Engineering National Chiao Tung University Hsinchu Taiwan Correspondence should be addressed to Wen-Fang Yang Received 16 January 2008 Accepted 8 May 2008 Recommended by Yuh-Shyan Chen Relying on a simple flag-assisted mechanism a multigroup priority queueing MGPQ medium access control MAC protocol is proposed for the wireless networks with multipacket reception MPR . The proposed MGPQ scheme is capable of overcoming two major performance bottlenecks inherent in the existing MPR MAC protocols. First the proposed solution can automatically produce the list of active users by observing the network traffic conditions remove the need of active user estimation algorithm and thus can largely reduce the algorithm complexity. Second the packet blocking constraint imposed on the active users for keeping compliant with prediction is relaxed. As a result the proposed MGPQ is not only applicable to both homogeneous and heterogeneous cases but also outperforms the existing MPR MAC protocols. Simulation results show that the network throughput can be improved by 40 maximum and 14 average as compared with the well-known dynamic queue DQ MAC protocol. Copyright 2008 Wen-Fang Yang et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION . Overview An efficient medium access control MAC mechanism is characterized by high throughput and low delay. Traditionally the design of MAC protocols is based on the so-called collision channel model that