Longtao Huang ShuiGuang Deng 147-148 2014 IEEE MS https://doi.org/10.1109/MobServ.2014.29 https://doi.ieeecomputersociety.org/10.1109/MobServ.2014.29 conf/mobserv/2014 db/conf/mobserv/mobserv2014.html#HuangD14