Xue Li 0011 Lanshun Nie Shuo Chen De-chen Zhan Xiaofei Xu 0001 438-445 2015 IEEE MS https://doi.org/10.1109/MobServ.2015.66 https://doi.ieeecomputersociety.org/10.1109/MobServ.2015.66 conf/mobserv/2015 db/conf/mobserv/mobserv2015.html#LiNCZX15