DocumentCode :
2554606
Title :
Energy Efficient Multi-rate Based Time Slot Pre-schedule Scheme in WSNs for Ubiquitous Environment
Author :
Wei, Wei ; Qi, Yong ; Qi, Saiyu ; Hou, Di ; Wang, Wei ; Xi, Min ; Yao, Qingsong
Author_Institution :
Xian Jiaotong Univ., Xian
fYear :
2007
fDate :
11-14 Dec. 2007
Firstpage :
75
Lastpage :
80
Abstract :
Nowadays, smart spaces occupy an essential part of ubiquitous computing environment. The spaces integrated with wireless sensors networks, actuators and context-aware services become part of our daily life. Smart spaces are equipped with a large number of wireless sensors that aim to collect large quantities of context information, during the process, there exists a large amount of collisions and energy consumption. Therefore, this paper provides a novel multi-rate based local framing pre-schedule scheme to further reduce collisions and improve energy efficiency in CSMA/TDMA hybrid MAC layer of wireless sensor network. This MAC combines CSMA and TDMA functionalities together while obviates their shortcomings. Having been assigned, slot 0 is preserved as the pre-schedule slot, to inform neighbor nodes the schedule of the senders. During the pre-schedule slot, each node knows exactly the schedule of other neighbor nodes. Multi-rate and power scaling are applied to achieve further energy saving by adpoting an acceptable rate rather than maximum rate. Data rate is dynamically adjusted according to the traffic load of sending nodes, in an energy efficient data rate, to save energy. Being compared with Z-MAC in terms of performances, local framing pre-schedule and multi-rate in this experiment achieved further energy efficiency.
Keywords :
power aware computing; scheduling; ubiquitous computing; wireless sensor networks; context information; context-aware service; energy consumption; energy efficient data rate; energy efficient time slot pre-schedule; energy saving; multi-rate based time slot pre-schedule; power scaling; pre-schedule slot; smart space; ubiquitous computing; wireless sensor network; Actuators; Context-aware services; Energy consumption; Energy efficiency; Intelligent sensors; Multiaccess communication; Telecommunication traffic; Time division multiple access; Ubiquitous computing; Wireless sensor networks;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Asia-Pacific Service Computing Conference, The 2nd IEEE
Conference_Location :
Tsukuba Science City
Print_ISBN :
0-7695-3051-6
Type :
conf
DOI :
10.1109/APSCC.2007.26
Filename :
4414444
Link To Document :
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