Energy-Efficient Broadcast Scheduling Algorithm in Duty-Cycled Multihop Wireless Networks

• Main Authors: Quan Chen, Tao Wang, Lianglun Cheng, Yongchao Tao, Hong Gao
• Format: Article
• Language: English
• Published: Hindawi-Wiley 2019-01-01
• Series: Wireless Communications and Mobile Computing
• Online Access: http://dx.doi.org/10.1155/2019/5064109

Broadcasting is a fundamental function for disseminating messages in multihop wireless networks. Minimum-Transmission Broadcasting (MTB) problem aims to find a broadcast schedule with minimum number of transmissions. Previous works on MTB in duty-cycled networks exploit a rigid assumption that nodes have only active time slot per working cycle. In this paper, we investigated the MTB problem in duty-cycled networks where nodes are allowed arbitrary active time slots per working cycle (MTBDCA problem). Firstly, it is proved to be NP-hard and o(ln⁡Δ)-inapproximable, where Δ is the maximum degree in the network. Secondly, an auxiliary graph is proposed to integrate nodes’ active time slots into the network and a novel covering problem is proposed to exploit nodes’ multiple active time slots for scheduling. Then, a ln⁡(Δ+1)-approximation algorithm is proposed for MTBDCA and a (ln⁡(Δ+1)+Δ)-approximation algorithm is proposed for all-to-all MTBDCA. Finally, extensive experimental results demonstrate the efficiency of the proposed algorithm.