METHOD FOR ONU LATE REGISTRATION METHOD IN GIGA BIT ETHERNET PASSIVE OPTICAL NETWORK AND THEREOF ETHERNET FRAME STRUCTURE

摘要

PURPOSE: A method for additionally registering ONUs(Optical Network Units) in a GE-PON(Gigabit Ethernet Passive Optical Network) and an Ethernet frame structure are provided to offer an additional ONU registration method required for the embodiment of GE-PON in a PON structure. CONSTITUTION: An OLT(Optical Line Termination) downlinks normal frames to a plurality of registered ONUs in order to provide a bandwidth allocation request opportunity to them(300). Each ONU uplinks a bandwidth allocation request frame at the bandwidth allocation request start point of the next cycle. The OLT collects bandwidth allocation requests from the registered ONUs(302), and executes scheduling for the requested bandwidths using a scheduler(304). Then the OLT compares BW_tot, a total available bandwidth, with BW_alloc, an allocation-requested bandwidth(306). If the difference between BW_tot and BW_alloc is larger than 208us(308), the OLT downlinks a grant frame for additional registration(312). Then, after waiting during the time of registration offset + frame time + slot position + down-stream delay time, the OLT judges whether a registration request frame is received(316).