An enhanced video PCF mechanism for video PAN and its implementation based on HiSilicon Hi3518 embedded platform

Aiming at meeting the application requirements of low time delay and packet lose rate of wireless HD video PAN, an Video Point Coordination Function (VPCF) mechanism for MAC layer scheduling based on IEEE 802.11 PCF is proposed in this paper. TSP service periods are allocated to video station, which has burst video frames to transfer, and the number of needed CBAP (Slot Period Transmission), is evaluated using a preemption counter. AT video station, Time Delay Threshold and Cache Use Rate Threshold are used to decide its station priority. Finally AP station of VPAN allocates channel resources to each video station, according to its time delay weight, cache weight, and station priority. Simulating results indicate that VPCF mechanism can improve the real time transfer of high-definition video stream in VPAN network effectively. Based on an embedded video platform HiSilicon Hi3518, A 3-station VPAN prototype system is developed and VPCF is programmed and evaluated.