An adaptive data aggregation scheme for wireless sensor networks in the TD-SCDMA system

This paper proposes an adaptive data aggregation for wireless sensor networks in the TD-SCDMA system. Our design explores a data transmission approach: the atomic MAC layer unit is sent through the TD-SCDMA radio channel by dynamically aggregating one or more sensor packets. A trade-off exists between the desire to reduce header and physical layer overhead by making frames larger, and the need to reduce frame error rates in the noisy channel by using small frame lengths. Clearly the optimum depends on the channel conditions. Our analysis shows that the proposed approach is scalable in maintenance overheads, and performs efficiently in the visible throughput. We implement the proposed protocol in a 3G wireless router and test its feasibility and applicability by a 20-node wireless sensor network. We further conduct extensive simulations to examine the efficiency and scalability of our scheme with varied network settings.