[5] [5] GHARAEI N,BAKAR K A,HASHIM Z M,et al. Collaborative mobile sink sojourn time optimization scheme for cluster-based wireless sensor networks[J]. IEEE Sensors Journal, 2018,18(16):6669-6676.

[6] [6] WANG Y,CHEN K. Efficient path planning for a mobile sink to reliably gather data from sensors with diverse sensing rates and limited buffers[J]. IEEE Transactions on Mobile Computing, 2018,3(7):23-31.

[7] [7] MA M,YANG Y. Data gathering in wireless sensor networks with mobile collectors[C]// 2008 IEEE International Symposium on Parallel and Distributed Processing. Miami,FL,USA:IEEE, 2008:1-9.

[8] [8] ARORA S. Polynomial time approximation schemes for Euclidean traveling salesman and other geometric problems[J]. Journal of The ACM, 1998,45(5):753-782.

[9] [9] SALARIAN H,CHIN K,NAGHDY F. An energy-efficient mobile-sink path selection strategy for wireless sensor networks[J]. IEEE Transactions on Vehicular Technology, 2014,63(5):2407-2419.

[10] [10] ZHANG R,PAN J,XIE D,et al. NDCMC:a hybrid data collection approach for large-scale WSNs using mobile element and hierarchical clustering[J]. IEEE Internet of Things Journal, 2016,3(4):533-543.

[11] [11] TARACHAND A,JANA P K. Energy-aware routing algorithm for wireless sensor networks[J]. Computers and Electrical Engineering, 2015,41(8):357-367.

[12] [12] KUMAR D P,TARACHAND A,RAO A C,et al. ACO-based mobile sink path determination for wireless sensor networks under non-uniform data constraints[J]. Applied Soft Computing, 2018,69(9):528-540.

[13] [13] WEN W,ZHAO S,SHANG C,et al. EAPC:energy-aware path construction for data collection using mobile sink in wireless sensor networks[J]. IEEE Sensors Journal, 2018,18(2):890-901.