Patent ID: 8717894

Claim:
A synchronization method of a layered wireless access system, which is applied to the layered wireless access system including an access point management unit located in an access layer and its linked access points, the access point management unit having a timing server, each access point having a timing client, the method comprising the steps of: the timing server generating timing information and distributing it to the timing client of each linked access point, and the timing client recovering the timing information as a local timing reference signal; wherein the access point management unit comprises a master access point management unit having an access gateway function and one or more slave access point management units connected to the master access point management unit, the master access point management unit and slave access point management unit which are connected directly to the linked access points have power line modulation and demodulation functions, and power lines are used as transmission media for the linked access points which are directly connected; the timing server is a ToP server; and the timing client is a ToP client; the access point management unit also includes a master control switching module, an access gateway function module and a centralized network management function module connected to the master control switching module; wherein the master control switching module processes and forwards data and signaling interaction of the linked access points of the access point management unit; the access gateway function module completes an aggregation of access information of access points and the processing of tunnel protocols, while providing route switching related information to a corresponding centralized access gateway; and processes a function of local wireless resource and self-routing function of local flow; and completes termination processing for its linked access points tunnel, flow shaping and flow control for a plurality of linked access points, as well as data flow scheduling processing based on access points; and the centralized network management function module performs operation maintenance and information processing of the access point management unit.