A new method for VoIP quality of service control use combined adaptive sender rate and priority marking. - Zizhi Qiao; Lingfen Sun; Nicolai Heilemann; Emmanuel C. Ifeachor (ICC, 2004)

Case study of PESQ performance in live wireless mobile VoIP environment. - Zizhi Qiao; Lingfen Sun; Emmanuel C. Ifeachor (PIMRC, 2008)

A New Buffer Algorithm for Speech Quality Improvement in VoIP Systems. - Zizhi Qiao; Ramesh K. Venkatasubramanian; Lingfen Sun; Emmanuel C. Ifeachor (Wirel. Pers. Commun., 2008)

Smarter Phone based Live QoE Measurement. - Zizhi Qiao (ICIN, 2011)

Base station direct transmission for mobile enterprise service - Opportunities, challenges and solution. - Jianquan Wang; Xiongyan Tang; Zizhi Qiao; Guangtao Zhou (ICIN, 2012)