CN108513181B - PON energy-saving method based on OLT cache - Google Patents

PON energy-saving method based on OLT cache Download PDF

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CN108513181B
CN108513181B CN201810296902.2A CN201810296902A CN108513181B CN 108513181 B CN108513181 B CN 108513181B CN 201810296902 A CN201810296902 A CN 201810296902A CN 108513181 B CN108513181 B CN 108513181B
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olt
onu
size
data service
buffer
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CN108513181A (en
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沈建华
喻聪
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Nanjing University of Posts and Telecommunications
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Nanjing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0064—Arbitration, scheduling or medium access control aspects

Abstract

The invention discloses a PON energy-saving method based on OLT cache, which comprises the following steps: step 1: a buffer is arranged at the OLT end and D is arrangedth(ii) a Step 2: inquiring a polling list; and step 3: judging whether an arrival direction ONUiSending GATE frame time, reaching a jump step 4, and not reaching a jump step 2; and 4, step 4: comparison DoltWhether or not D is exceededthStep 5, skipping, not exceeding the step of not sending data; and 5: if D isoltOr UniExceeds UmaxJump to step 9, if DoltAnd UniAre not over UmaxSkipping step 6; step 6: if D isoltExceeds UniSkipping step 7; step 8 is not exceeded; and 7: ONU (optical network Unit)iThe size of data to be transmitted is Dolt(ii) a And 8: ONU (optical network Unit)iThe size of the data to be transmitted is Uni(ii) a And step 9: ONU (optical network Unit)iThe size of the data to be transmitted is Umax. The invention has the advantages of energy saving and time delay reduction.

Description

PON energy-saving method based on OLT cache
Technical Field
The invention relates to the technical field of optical communication, passive optical networks and access networks, in particular to a PON energy-saving method based on OLT cache.
Background
A Passive Optical Network (PON) is a mainstream technology of Optical broadband access, and mainly includes an Optical Line Terminal (OLT) at a central office end, an Optical Network Unit (ONU) at a user end, and an Optical Distribution Network (ODN). The traditional PON system side is allocated to uplink and downlink bandwidths, the problem of energy consumption of the PON system is less considered, and a polling mechanism mainly used in the PON system does not support the sleep and standby modes of the ONU. Therefore, as the rapid increase of the deployment scale of the PON system causes a rapid increase of network energy consumption, energy saving of the PON network has become a focus of attention in academic and industrial fields from the viewpoint of reducing network energy consumption and saving network operation cost.
The academia has proposed some solution strategies for PON energy saving technologies. 4 ONU energy-saving schemes are proposed in ITU-T G.984 standard, which are called ONU burden reduction, ONU false sleep, ONU fast/periodic sleep and ONU deep sleep respectively, wherein the last three can also be called ONU sleep technologies. Offload refers to when an optical link is operating at full speed, some unnecessary functions and services may be disconnected. The sleep means that the ONU can be switched to a sleep state when the service is idle, and wake up when data needs to be transmitted/received. For the g.984 scheme, Y Yan et al proposes an improved energy saving scheme, namely, an Uplink Central Scheduling (UCS) mechanism. The UCS mechanism specifies that downlink data traffic must wait for uplink timeslot authorized by the ONU to be transmitted, so the UCS has a good energy-saving effect, but has a disadvantage of introducing a large downlink delay to affect the service quality of the system. Another dormancy-aware dynamic Bandwidth Allocation algorithm (SDBA) proposed by Dung pharma Van et al, which prolongs the ONU dormancy time as much as possible by changing the polling period of the SDBA, but has the disadvantage that the polling period is set to be complicated, and it is necessary to allocate the polling period to all services according to the strictest requirements among different types of services. Based on SDBA, Dung pharma Van et al propose an enhanced Sleep-aware Dynamic Bandwidth allocation algorithm (ASDBA), which further uses the time for transmitting control frames to change the scheduling order of the conventional energy-saving Dynamic Bandwidth allocation, but the algorithm cannot accurately calculate the size of the Bandwidth required by the service, and does not effectively use the REPORT frame information. The method of singly introducing ONU sleep in the existing passive optical network has the defects of not simultaneously solving the problems of energy saving and time delay reduction.
Disclosure of Invention
The invention aims to provide a PON energy-saving method based on OLT cache, which can effectively reduce the time delay of downlink data service while reducing the energy consumption of a PON system.
In order to achieve the purpose, the invention adopts the following technical scheme: the PON energy-saving method based on the OLT cache comprises the following steps:
step (1): firstly, setting a buffer at an OLT end, and simultaneously setting a threshold value for the buffer, wherein the OLT can detect whether the size of a buffer data service in the buffer exceeds the threshold value in real time;
step (2): the OLT inquires a polling list;
and (3): judging whether an arrival direction ONUiTime to send GATE frame, if arriving to ONUiWhen the GATE frame is sent, step (4) is executed, if the GATE frame does not arrive at the ONUiSkipping to execute the step (2) when the GATE frame is sent;
and (4): the OLT detects whether the size of the downlink data service in the buffer exceeds a threshold value at the moment, if the size of the downlink data service in the buffer exceeds the threshold value, the step (5) is executed, and if the size of the downlink data service in the buffer does not exceed the threshold value, the OLT is positioned at the ONUiDoes not send downlink data service in the authorized time slot;
and (5): judging the size of downlink data service or ONU in the buffer of OLTiWhether the size of the uplink data service applied to the OLT for transmission exceeds the ONU specified by the OLT or notiSending the maximum value of data service in the authorized time slot if the size of downlink data service in the buffer of OLT or ONUiONU (optical network Unit) with size of uplink data service applied to OLT for transmission exceeding OLT regulationiSending the maximum value of the data service in the authorized time slot, skipping and executing the step (9), if the size of the downlink data service in the buffer of the OLT and the ONUiThe sizes of the uplink data services applied to the OLT for transmission do not exceed the ONU specified by the OLTiIf the maximum value of the data service is sent in the authorized time slot, executing the step (6);
and (6): judging whether the size of the downlink data service in the buffer of the OLT exceeds the ONUiApplying for the size of the uplink data service to be sent to the OLT, if the size of the downlink data service in a buffer of the OLT exceeds that of the ONUiApplying for the size of the sent uplink data service to the OLT, and executing the step (7); if the size of the downlink data service in the buffer of the OLT does not exceed the ONUiApplying for the size of the sent uplink data service to the OLT, skipping to execute the step (8);
and (7): OLT-to-ONUiTransmitting GATE frame, ONUiThe size of the data service which can be sent in the authorized time slot is the size of the downlink data in the buffer of the OLT;
and (8): OLT-to-ONUiSending GATE frames, ONUiThe size of data traffic which can be sent in the authorized time slot is ONUiApplying for the size of the transmitted uplink data to the OLT;
and (9): OLT-to-ONUiSending GATE frames, ONUiONU is specified for OLT in data traffic size that can be sent in authorized time slotiThe maximum value of data is transmitted within the granted time slot.
Through the implementation of the technical scheme, the invention has the beneficial effects that: the method and the device can ensure that the OLT finishes sending all downlink data services in the authorized time slot of the ONU, maximize the sleep time of the ONU, reduce the energy consumption of the PON system, reduce the time delay of the downlink data services, improve the service quality of the PON system and optimize the network performance.
Drawings
Fig. 1 is a flow chart of a PON energy saving method based on OLT caching according to the present invention.
Fig. 2 is a timing diagram illustrating polling from the OLT to the ONUs in the PON energy saving method based on the OLT cache according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1 and fig. 2, the PON energy saving method based on OLT caching includes the following steps:
step (1): firstly, setting a buffer at an OLT end, and simultaneously setting a threshold value for the buffer, wherein the OLT can detect whether the size of a buffer data service in the buffer exceeds the threshold value in real time;
step (2): the OLT inquires a polling list;
and (3): judging whether an arrival direction ONUiTime to send GATE frame, if arriving to ONUiWhen the GATE frame is sent, step (4) is executed, if the GATE frame does not arrive at the ONUiAt the time of sending the GATE frame, the skip is executedCarrying out step (2);
and (4): the OLT detects whether the size of the downlink data service in the buffer exceeds a threshold value at the moment, if the size of the downlink data service in the buffer exceeds the threshold value, the step (5) is executed, and if the size of the downlink data service in the buffer does not exceed the threshold value, the OLT is at the ONUiDoes not send downlink data service in the authorized time slot;
and (5): judging the size of downlink data service or ONU in the buffer of OLTiWhether the size of the uplink data service applied to the OLT for transmission exceeds the ONU specified by the OLT or notiSending the maximum value of data service in the authorized time slot if the size of downlink data service in the buffer of OLT or ONUiONU (optical network Unit) with size of uplink data service applied to OLT for transmission exceeding OLT regulationiIf the maximum value of the data service sent in the authorized time slot exceeds, skipping and executing the step (9), if the size of the downlink data service in the buffer of the OLT and the ONUiThe sizes of the uplink data services applied to the OLT for transmission do not exceed the ONU specified by the OLTiIf the maximum value of the data service is sent in the authorized time slot, executing the step (6);
and (6): judging whether the size of the downlink data service in the buffer of the OLT exceeds the ONUiApplying for the size of the uplink data service to be sent to the OLT, if the size of the downlink data service in a buffer of the OLT exceeds that of the ONUiApplying for the size of the sent uplink data service to the OLT, and executing the step (7); if the size of the downlink data service in the buffer of the OLT does not exceed the ONUiApplying for the size of the sent uplink data service to the OLT, skipping to execute the step (8);
and (7): OLT-to-ONUiSending GATE frames, ONUiThe size of the data service which can be sent in the authorized time slot is the size of the downlink data service in the buffer of the OLT;
and (8): OLT-to-ONUiSending GATE frames, ONUiThe size of data traffic which can be sent in the authorized time slot is ONUiApplying for the size of the transmitted uplink data service to the OLT;
and (9): OLT-to-ONUiSending GATE frames，ONUiONU is specified for OLT in data traffic size that can be sent in authorized time slotiThe maximum value of data traffic is transmitted within the granted time slot.
In this embodiment, D is definedthIs a threshold value, DoltSize and U of downlink data service in buffer of OLTniFor ONUiSize and U of uplink data service applied to OLT for transmissionmaxSpecifying ONUs for an OLTiTransmitting the maximum value of the data service in the authorized time slot; and assume that the PON system has 3 ONUs, UsmaxThe maximum value of each ONU allowed by OLT to send uplink data service in authorized time slot in the polling period satisfies | Dth|<|UmaxL, |; with a polling period Tc1For example, a process in which the OLT polls each ONU and sequentially grants time slots for each ONU is described, which specifically includes the following steps:
at t0At that moment, OLT sends ONU1Sending GATE frames to the ONU1Granted time slot of t0To t1In authorized time slots, ONU1The size of the uplink data sent to the OLT is U11(ii) a Meanwhile, the OLT monitors that the buffer is sent to the ONU1The size of the downlink data service does not exceed the threshold value DthTherefore not to ONU1Sending downlink data; ONU (optical network Unit)1Immediately after receiving the GATE frame, the receiver is turned off, at t1At the moment, the uplink data transmission is finished, and the ONU1A sleep mode is entered.
At t1At the moment, the OLT monitors the size D of the downlink data service in the bufferoltExceeds a threshold value DthAt the same time, DoltAnd ONU in REPORT frame2Size U for applying to OLT to send data12In comparison, e.g. | U12|>|DoltIf so, the OLT is directed to the ONU at the moment2Sending GATE frame with authorized time slot t1To t2In authorized time slots, ONU2The size of the uplink data sent to the OLT is U12OLT to ONU2The size of the transmitted downlink data is Dolt。ONU2Immediately shutting down the receiver after receiving the downlink data until t2Time of day, number of uplinksAccording to the completion of the transmission, the ONU2A sleep mode is entered.
At t2At the moment, the OLT monitors the size D of the downlink data service in the bufferoltExceeds a threshold value DthWhile D isoltAnd ONU in REPORT frame3Size U for applying to OLT to send data13In comparison, e.g. | U13|<|DoltIf yes, OLT sends signal to ONU3Sending GATE frame with authorized time slot t2To t4In authorized time slots, ONU3The size of the uplink data sent to the OLT is U13OLT to ONU3The size of the transmitted downlink data is Dolt，ONU3Immediately closing the transmitter after finishing sending the uplink data until t4At the moment, the downlink data reception is finished, and the ONU3A sleep mode is entered. The end of a polling cycle, and therefore the ONU, taking into account the need to recover the clock and synchronize the network when switching from sleep mode to active mode3The internal timer needs to be at t3Time-to-time ONU1And (6) waking up.
The invention has the advantages that: the method and the device can ensure that the OLT finishes sending all downlink data services in the authorized time slot of the ONU, maximize the sleep time of the ONU, reduce the energy consumption of the PON system, reduce the time delay of the downlink data services, improve the service quality of the PON system and optimize the network performance.

Claims (1)

1. A PON energy-saving method based on OLT cache is characterized in that: the method comprises the following steps:
step (1): firstly, setting a buffer at an OLT end, and simultaneously setting a threshold value for the buffer, wherein the OLT can detect whether the size of a buffer data service in the buffer exceeds the threshold value in real time;
step (2): the OLT inquires a polling list;
and (3): judging whether an arrival direction ONUiTime to send GATE frame, if arriving to ONUiWhen the GATE frame is sent, step (4) is executed, if the GATE frame does not arrive at the ONUiSkipping to execute the step (2) when the GATE frame is sent;
and (4): the OLT detects whether the size of the downlink data service in the buffer exceeds a threshold value at the moment, if the size of the downlink data service in the buffer exceeds the threshold value, the step (5) is executed, and if the size of the downlink data service in the buffer does not exceed the threshold value, the OLT is positioned at the ONUiDoes not send downlink data service in the authorized time slot;
and (5): judging the size of downlink data service or ONU in the buffer of OLTiWhether the size of the uplink data service applied to the OLT for transmission exceeds the ONU specified by the OLT or notiSending the maximum value of data service in the authorized time slot if the size of downlink data service in the buffer of OLT or ONUiONU (optical network Unit) with size of uplink data service applied to OLT for transmission exceeding OLT regulationiSending the maximum value of the data service in the authorized time slot, skipping and executing the step (9), if the size of the downlink data service in the buffer of the OLT and the ONUiThe sizes of the uplink data services applied to the OLT for transmission do not exceed the ONU specified by the OLTiIf the maximum value of the data service is sent in the authorized time slot, executing the step (6);
and (6): judging whether the size of the downlink data service in the buffer of the OLT exceeds the ONUiApplying for the size of the uplink data service to be sent to the OLT, if the size of the downlink data service in a buffer of the OLT exceeds that of the ONUiApplying for the size of the sent uplink data service to the OLT, and executing the step (7); if the size of the downlink data service in the buffer of the OLT does not exceed the ONUiApplying for the size of the sent uplink data service to the OLT, skipping to execute the step (8);
and (7): OLT-to-ONUiSending GATE frames, ONUiThe size of the data service which can be sent in the authorized time slot is the size of the downlink data in the buffer of the OLT;
and (8): OLT-to-ONUiSending GATE frames, ONUiThe size of data traffic which can be sent in the authorized time slot is ONUiApplying for the size of the transmitted uplink data to the OLT;
and (9): OLT-to-ONUiSending GATE frames, ONUiData traffic capable of being transmitted in authorized time slotsSpecifying ONUs for OLT sizeiThe maximum value of data is transmitted within the granted time slot.
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