SYSTEM AND METHOD FOR BANDWIDTH ALLOCATION IN GPON

摘要

A GPON(Gigabit-capable Passive Optical Network) system and a band allocation method in the GPON system are provided to guarantee an uplink channel transmission according to T-CONT(Traffic-Container) priority in a congested situation in a short term, and prevent traffic congestion of a network in a long term. A variable 'i' indicating an ONU(Optical Network Unit) is set as 1 and initialization is performed(S401). An OLT(Optical Line Termination) receives a request for allocating a bandwidth from the ONUi, checks whether the allocation-requested bandwidth is greater than a minimum bandwidth of the corresponding ONUi(S402), and allocates a bandwidth as much as requested by ONUi(S403). It is checked whether the value 'i' is the same as the number of entire ONUs(S404). When the value 'i' is the same as the number of the entire ONUs, a variable 'k' indicating the ONU is set as 1(S406). An OLT checks whether there is an extra bandwidth and whether there is a T-CONT to which bandwidth has not been allocated(S407), and if so, a weight value of each T-CONT class, a weight value of each ONU in accordance with a rate of each T-CONT buffer queuing, and an allocation band of each T-CONT class of each ONU are calculated(S408). Each ONU is given a priority level according to its weight value(S409), and the band calculated by each ONU is allocated, starting from the ONU having the highest priority level(S410). It is checked whether the variable 'K' indicating numbers of ONUs is the same as the number of the entire ONUs(S411). When dynamic allocation for the ONUs is completed, the allocated result is transmitted to each ONU(S413).