Optical line terminal and optical network unit
First Claim
1. An optical network unit (ONU) that is used in an optical network in which one optical line terminal (OLT) performs point-to-point or point-to-multi-point communication with one or more optical network units (ONU) through an optical fiber transmission path and saves power of the optical network, the optical network unit (ONU) including:
- an observing unit that observes, in a first predetermined period of time, an arrival interval of frames, an instantaneous bandwidth under use of a flow, or a queue length of a queue temporarily storing the frames, and the presence or absence of traffic of one or more specific protocol or priority transferred between a user network interface (UNI) of the ONU and a service node interface (SNI) of the OLT;
a stop determining unit that determines to stop partial functions of the ONU if;
(a) the arrival interval of the frames observed by the observing unit is equal to or greater than a threshold value of the arrival interval of the frames;
(b) the instantaneous bandwidth under use observed by the observing unit is equal to or smaller than a threshold value of the instantaneous bandwidth under use;
or(c) the queue length observed by the observing unit is equal to or smaller than a threshold value of the queue length,determines not to stop the partial functions of the ONU if;
(d) the arrival interval of the frames observed by the observing unit is smaller than the threshold value of the arrival interval of the frames;
(e) the instantaneous bandwidth under use observed by the observing unit is greater than the threshold value of the instantaneous bandwidth under use, or(f) the queue length observed by the observing unit is greater than the threshold value of the queue length; and
determines not to stop the partial functions of the ONU if;
(g) the observing unit observes the traffic of the specific protocol or priority even though (a), (b), or (c) is satisfied; and
a stopping unit that stops the partial functions of the ONU for a second predetermined time when the stop determining unit determines to stop the partial functions of the ONU or to maintain the ONU in an active state when the stop determining unit determines not to stop the partial functions of the ONU, and that achieves power saving of the ONU while preventing disconnection and frame transmission delay of the traffic of the specific protocol or priority.
2 Assignments
0 Petitions
Accused Products
Abstract
An optical line terminal which includes an observing unit that observes information of any one or all of an arrival interval of frames, an instantaneous bandwidth under use of a flow, a queue length of a queue temporarily storing the frames, and a traffic type, and a stop determining unit that dynamically determines a sleep time to be a period in which a sleep state where partial functions of the ONU are stopped is maintained, on the basis of the information obtained by the observing unit. The ONU is entered into a sleep state, immediately after communication ends, after a predetermined waiting time passes from when the communication ends, or after a waiting time determined on the basis of the information passes from when the communication ends.
18 Citations
36 Claims
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1. An optical network unit (ONU) that is used in an optical network in which one optical line terminal (OLT) performs point-to-point or point-to-multi-point communication with one or more optical network units (ONU) through an optical fiber transmission path and saves power of the optical network, the optical network unit (ONU) including:
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an observing unit that observes, in a first predetermined period of time, an arrival interval of frames, an instantaneous bandwidth under use of a flow, or a queue length of a queue temporarily storing the frames, and the presence or absence of traffic of one or more specific protocol or priority transferred between a user network interface (UNI) of the ONU and a service node interface (SNI) of the OLT; a stop determining unit that determines to stop partial functions of the ONU if; (a) the arrival interval of the frames observed by the observing unit is equal to or greater than a threshold value of the arrival interval of the frames; (b) the instantaneous bandwidth under use observed by the observing unit is equal to or smaller than a threshold value of the instantaneous bandwidth under use;
or(c) the queue length observed by the observing unit is equal to or smaller than a threshold value of the queue length, determines not to stop the partial functions of the ONU if; (d) the arrival interval of the frames observed by the observing unit is smaller than the threshold value of the arrival interval of the frames; (e) the instantaneous bandwidth under use observed by the observing unit is greater than the threshold value of the instantaneous bandwidth under use, or (f) the queue length observed by the observing unit is greater than the threshold value of the queue length; and determines not to stop the partial functions of the ONU if; (g) the observing unit observes the traffic of the specific protocol or priority even though (a), (b), or (c) is satisfied; and a stopping unit that stops the partial functions of the ONU for a second predetermined time when the stop determining unit determines to stop the partial functions of the ONU or to maintain the ONU in an active state when the stop determining unit determines not to stop the partial functions of the ONU, and that achieves power saving of the ONU while preventing disconnection and frame transmission delay of the traffic of the specific protocol or priority. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 29, 30, 31, 32, 33)
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2. An optical line terminal (OLT) that is used in an optical network in which one optical line terminal (OLT) performs point-to-point or point-to-multi-point communication with one or more optical network units (ONU) through an optical fiber transmission path and saves power of the optical network, the optical line terminal (OLT) including:
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an observing unit that observes, in a first predetermined time, for each traffic with respect to each ONU connected to the OLT, an arrival interval of frames, an instantaneous bandwidth under use of a flow, or a queue length of a queue temporarily storing the frames, and the presence or absence of the traffic of one or more specific protocol or priority transferred between a user network interface (UNI) of the ONU and a service node interface (SNI) of the OLT; and a stop determining unit that, without receiving a sleep request from the ONU, determines to stop partial functions of the ONU if; (a) the arrival interval of the frames observed by the observing unit is equal to or greater than a threshold value of the arrival interval of the frames; (b) the instantaneous bandwidth under use observed by the observing unit is equal to or smaller than a threshold value of the instantaneous bandwidth under use;
or(c) the queue length observed by the observing unit is equal to or smaller than a threshold value of the queue length, and determines not to stop the partial functions of the ONU if; (d) the arrival interval of the frames observed by the observing unit is smaller than the threshold value of the arrival interval of the frames; (e) the instantaneous bandwidth under use observed by the observing unit is greater than the threshold value of the instantaneous bandwidth under use;
or(f) the queue length observed by the observing unit is greater than the threshold value of the queue length; and determines not to stop the partial functions of the ONU if; (g) the observing unit observes the traffic of the specific protocol or priority even though (a), (b), or (c) is satisfied, wherein the stop determining unit stops the ONU by transmitting a sleep command message to stop partial functions of the ONU for a second predetermined time when the stop determining unit determines to stop the partial functions of the ONU, wherein the stop determining unit maintains the ONU in an active state without transmitting the sleep command message when the stop determining unit determines not to stop the ONU, and wherein the function of the stop determining unit achieves power saving of the ONU while preventing disconnection and frame transmission delay of the traffic of the specific protocol or priority. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 34, 35, 36)
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3. An optical network in which one optical line terminal (OLT) performs point-to-point or point-to-multi-point communication with one or more optical network units (ONU) through an optical fiber transmission path,
wherein the optical network includes: -
an observing unit that observes information of at least one of an arrival interval of frames, an instantaneous bandwidth under use of a flow, a queue length of a queue temporarily storing the frames, and at least one traffic of a specific type; and a stop determining unit that dynamically determines a sleep time to be a period in which a sleep state where partial functions of the ONU are stopped is maintained, on the basis of the information obtained by the observing unit, and wherein the optical network includes; a stopping unit that enters the ONU into a sleep state, immediately after point-to-point or point-to-multi-point communication ends, after a predetermined waiting time passes from when the point-to-point or point-to-multi-point communication ends, or after a waiting time determined by the stop determining unit on the basis of the information passes from when the point-to-point or point-to-multi-point communication ends, wherein the ONU enters into the sleep state based on an acknowledgment (ACK) message from the OLT of a sleep request message to the OLT or an acknowledgement to the OLT of a sleep instruction message from the OLT, wherein the stop determining unit sets a maximum value and a minimum value for the sleep time, and maintains the ONU in a normal state, in the case of at least one of;
(1) where the arrival interval of the frames obtained by the observing unit is smaller than a threshold value of the arrival interval of the frames, (2) where the instantaneous bandwidth under use is greater than a threshold value of the instantaneous bandwidth under use, and (3) where the queue length is greater than a threshold value of the queue length, andwherein the stop determining unit enters the ONU into the sleep state in the case of at least one of;
(1) where the arrival interval of the frames obtained by the observing unit is equal to or greater than the threshold value of the arrival interval of the frames, (2) where the instantaneous bandwidth under use is equal to or smaller than the threshold value of the instantaneous bandwidth under use, and (3) where the queue length is equal to or smaller than the threshold value of the queue length, and the OLT sets the sleep time to a value between the maximum value and the minimum value. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification