Design issues of IEEE 802.11ax protocol

To seek for fundamental improvement of 802.11, a new effort knownas IEEE 802.11ax has been approved to deliver next generation wireless localarea networks (WLAN) technologies in dense environments. In WLAN,to enable efficient channel sharing while providing quality of service (QoS)and high user experience for multimedia applications, medium access control(MAC) protocol is the crucial component.To catch up with the new physicallayer, featuring simultaneous multi-user transmission, new MAC functionsneed proposing. In this thesis, we point out several design issues for MACprotocol. Based on the draft recently issued, we present and discuss some issues,e.g., the design principles of random access, priority support, and overlappingbasic service set (OBSS) management. Furthermore, to relieve theimpact LTE Licensed-Assisted Access (LTE-LAA) brought on QoS provisioningin IEEE 802.11ax, the coexistent problem is addressed in the end ofthis thesis.