(2) Competitive access period (CAP) during this period,
the terminal by means of competition, for example, CSMA/CA contention channel. It can be used to exchange the command frame and asynchronous data;
(3) Channel time allocation period (CTAP) no
competition, the micro grid PNC according to the load distribution slot DEV application and the network bandwidth to apply for DEV. It can be used to exchange the command frame, asynchronous data and synchronous data stream;