Authorization mechanisms for mobile commerce implementations in enhanced prepaid solutions. - Yigang Cai; Jack Kozik; Helmut L. Raether; John B. Reid; Guy H. Starner; Sunil Thadani; Kumar V. Vemuri (Bell Labs Tech. J., 2004)

IP multimedia subsystem online session charging call control. - Yigang Cai; Xian Yang Li; Yile Wang; John B. Reid; Peng Wang (Bell Labs Tech. J., 2006)

IP multimedia subsystem converged call control services. - Sheng Chen 002; Xiangyang Li; Yigang Cai (Bell Labs Tech. J., 2007)

Converged network common charging controller function. - Xiang-Yang Li; Yigang Cai (Bell Labs Tech. J., 2008)

Online charging in the roaming EPC/LTE network. - Yigang Cai; Xiang-Yang Li 001 (Bell Labs Tech. J., 2010)

Dynamic Policy and Charging Control Framework. - Xiang-Yang Li 001; Kim Brouard; Yigang Cai (Bell Labs Tech. J., 2012)

Management Optimization of Mobile Edge Computing (MEC) in 5G Networks. - Zhi Wang; Yigang Cai (ICC Workshops, 2019)