Patent ID: 7583669

Claim:
A method of dynamically managing multicast groups for communication-broadcasting convergence based on IGMP snooping-based in a WDM-PON having an OLT and a plurality of ONTs, comprising: a first step of allowing the OLT to allocate individual data wavelengths λ c and a shared broadcasting wavelength λ b to the respective ONTs, and checking an IGMP control message between the individual ONTs and a multicast server; a second step of, if the message is a multicast group join message of a specific ONT as a result of the checking at the first step, determining whether the group is a newly created group or an existing registered group; a third step of, if it is determined that the group is a newly created group as a result of the determination at the second step, determining a multicast type of the group by ascertaining the depth of allowable maximum multicast groups within a bandwidth of the broadcasting wavelength λ b ; and a fourth step of, if it is determined that the group is an existing registered group as a result of the determination at the second step, determining a multicast type of the group by ascertaining the depth of allowable maximum multicast groups within the bandwidth of the broadcasting wavelength λ b , and comparing a share index between two multicast groups in order to change the multicast types of the two multicast groups by performing group swapping.