A medium access control protocol for UWB sensor networks with QoS support

—Ultra-wideband (UWB) is a physical (PHY) layer technology that promises high transmission rates, as well as high resistance to noise and multipath effects. However, the impulsebased nature of UWB, coupled with its low transmission power, makes it difficult to enable efficient detection of the signals. Consequently, conventional carrier-sensing based MAC protocols cannot be used with a UWB PHY. In this paper, we propose SASW-CR - a Slotted Aloha MAC protocol for UWB networks with Sliding contention Window and Coperative Retransmissions, which provides QoS support without the use of carrier sensing. SASW-CR utilizes the slotted-Aloha technique to avoid carrier sensing and reduce packet collisions. In addition, it makes use of differentiated contention windows to provide varying classes of QoS for different traffic classes. A cooperative retransmission technique is also introduced to improve the overall traffic throughput and reduce end-to-end delay. The efficacy of our protocol i...

• Type: Conference
• Year: 2008
• Where: LCN
• Authors: Jicong Tan, Mun-Choon Chan, Hwee-Xian Tan, Peng Yong Kong, Chen-Khong Tham
• Keywords: Carrier Sensing, Computer Networks, Contention Windows, LCN 2008, UWB PHY