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US 8,285,143 B2Granted
Method of allocating bandwidth of passive optical network
AssigneeElectronics and Telecommunications Research Institute
InventorsTae Yeon Kim, Kang bok Lee, Eui Suk Jung, Jea Hoon Yu, Byoung Whi Kim
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Abstract
In a method of allocating a bandwidth of a passive optical network, downward data are transmitted by varying a wavelength based on a wavelength division method and upward data are transmitted using a time division method. Thereby, by efficiently allocating a network bandwidth, data can be transmitted and by realizing statistical multiplexing, transmission efficiency can be improved.
Claims3
A method of allocating a bandwidth of a PON, comprising:
- transmitting downward data to a plurality of ONTs through a first wavelength for a downward wavelength time period in which an OLT is set and receiving upward data and a report message including a requirement for a bandwidth of the plurality of ONTs from the plurality of ONTs through the first wavelength;
- setting a downward wavelength time period of a second wavelength according to the report message and a wavelength band allocation reference and dynamically allocating a bandwidth of upward transmission based on the downward wavelength time period;
- and
- transmitting a gate message including downward data and the changed bandwidth information of upward transmission to the plurality of ONTs through the second wavelength for the preset downward wavelength time period,
- wherein the dynamic allocating of a bandwidth comprises allocating, when a wavelength band allocation reference is minimum allocation, a downward wavelength time period and a bandwidth of the second wavelength by recording a data amount of a downward buffer at a time point when downward data transmission of the first wavelength is terminated and by selecting a minimum value among a bandwidth requested through the report message and data of the downward buffer.
2 more elements
A method of allocating a bandwidth of a PON, comprising:
- transmitting downward data to a plurality of ONTs through a first wavelength for a downward wavelength time period in which an OLT is set and receiving upward data and a report message including a requirement for a bandwidth of the plurality of ONTs from the plurality of ONTs through the first wavelength;
- setting a downward wavelength time period of a second wavelength according to the report message and a wavelength band allocation reference and dynamically allocating a bandwidth of upward transmission based on the downward wavelength time period;
- and
- transmitting a gate message including downward data and the changed bandwidth information of upward transmission to the plurality of ONTs through the second wavelength for the preset downward wavelength time period,
- wherein the dynamic allocating of a bandwidth comprises allocating, when a wavelength band allocation reference is maximum allocation, a downward wavelength time period and a bandwidth of the second wavelength by recording a data amount of a downward buffer at a time point when downward data transmission of the first wavelength is terminated and by selecting a maximum value among a bandwidth requested through the report message and data of the downward buffer.
2 more elements
A method of allocating a bandwidth of a PON, comprising:
- transmitting downward data to a plurality of ONTs through a first wavelength for a downward wavelength time period in which an OLT is set and receiving upward data and a report message including a requirement for a bandwidth of the plurality of ONTs from the plurality of ONTs through the first wavelength;
- setting a downward wavelength time period of a second wavelength according to the report message and a wavelength band allocation reference and dynamically allocating a bandwidth of upward transmission based on the downward wavelength time period;
- and
- transmitting a gate message including downward data and the changed bandwidth information of upward transmission to the plurality of ONTs through the second wavelength for the preset downward wavelength time period,
- wherein the dynamic allocating of a bandwidth comprises allocating, when a wavelength band allocation reference is compromise allocation, a downward wavelength time period and a bandwidth of the second wavelength by recording a data amount of a downward buffer at a time point when downward data transmission of the first wavelength is terminated, by selecting a great value among a bandwidth requested through the report message and data of the downward buffer, by comparing the selected value with a maximum transmission window allowed in the second wavelength, and by selecting a minimum value among the selected value and the maximum allocation window.
2 more elements
Dependencies are inferred from the claim text.