CN102404188A - Method and system capable of maintaining link in energy saving state of Ethernet passive optical network - Google Patents
Method and system capable of maintaining link in energy saving state of Ethernet passive optical network Download PDFInfo
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- CN102404188A CN102404188A CN2010102825373A CN201010282537A CN102404188A CN 102404188 A CN102404188 A CN 102404188A CN 2010102825373 A CN2010102825373 A CN 2010102825373A CN 201010282537 A CN201010282537 A CN 201010282537A CN 102404188 A CN102404188 A CN 102404188A
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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
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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
- H04Q2011/0079—Operation or maintenance aspects
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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
- H04Q2011/0088—Signalling aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/1301—Optical transmission, optical switches
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Abstract
The invention discloses two sets of schemes of a method capable of maintaining link in the energy saving state of an Ethernet passive optical network, wherein one set of scheme is characterized in that an optical network unit (ONU) wakes up periodically in the energy saving state according to a default wakeup period or a wakeup period configured by an optical line terminal (OLT); and the ONU receives and transmits data frames for maintaining the links when periodically waking up. The invention also discloses two sets of schemes of a system capable of maintaining link in the energy saving state of the Ethernet passive optical network, in one set of scheme, a configuration unit in the system is used when the OLT configures the wakeup period for the ONU; and a link maintaining unit is used for receiving or sending the data frames for maintaining the link so as to realize the link maintaining when the ONU wakes up periodically at the energy saving state according to the default wakeup period or the wakeup period configured by the OLT. By adopting the method and the system of the invention, the link maintaining can be realized in the energy saving state.
Description
Technical field
The present invention relates to Ethernet passive optical network (EPON, Ethernet Passive Optical Network) field, relate in particular to the method and system of under power save mode, keeping link in a kind of EPON system.
Background technology
1G-EPON and 10G-EPON are based on the comprehensive access technology of new generation broadband passive light of IEEE802.3-2005 Section 5 and IEEE802.3av standard respectively; System is usually by the optical line terminal (OLT of office's side; Optical Line Terminal), the optical network unit (ONU of user side; Optical NetworkUnit)/ONT Optical Network Terminal (ONT; Optical Network Termination) and Optical Distribution Network (ODN, Optical Distribution Network) form, as shown in Figure 1.Wherein, ODN is made up of Passive Optical Components such as monomode fiber and optical branching device, optical connectors, and ODN is that the physical connection between OLT and the ONU/ONT provides light-transmitting medium.ODN is generally and a little arrives multipoint configuration, and promptly an OLT connects a plurality of ONU.
Stipulated a kind of link maintenance mechanism among IEEE802.3-2005 Section 5 Clause 64.3.With the user side terminal is that ONU is an example; Each is in the ONU of registered (registered) state; OLT then sends the GATE MPCP message of a sky if do not send gating (GATE) Multi-point Control Protocol (MPCP) message to this ONU at 50ms in the time to this ONU; OLT is not if received report (REPORT) the MPCP message of its transmission in 1 second; Then think link gross error has taken place between OLT and ONU; The inner state machine with this ONU correspondence of OLT self is moved to registration (deregistered) state, initiate the registration process of this ONU then again.Be in the ONU of registered state,, then send the REPORTMPCP message of a sky to OLT if in 50ms, do not send REPORT MPCP message to OLT.ONU then thinks link gross error has taken place if do not receive that in 1 second OLT issues the GATE MPCP message of oneself, moves to house dog overtime (WATCHDOG TIMEOUT) state, carries out registration process then again.Can be found out that by above-mentioned rule for the ONU that is in registered state, OLT need send message to ONU with the interval of the longest 50ms, same ONU also need send message to OLT with the interval of the longest 50ms.
The agreement of some operation layers also has link maintenance mechanism.Like IGMP (IGMP, Internet Group Management Protocol) agreement, at regular intervals, server can send igmp querying (QUERY) protocol frame to the user, and the user must return IGMP report (REPORT) protocol frame.If server is not received IGMP REPORT response within a certain period of time, can think that the user has no longer needed this multicast data flow, can stop to send multicast packet to the user.
When the EPON system was in power save mode, the reception of ONU and transmission were all closed, and perhaps sent and closed.Because prior art need be sent the Frame of keeping link mutually between ONU and OLT; Realize link maintenance mechanism; And under power save mode, can't send Frame (comprising that the Frame of keeping link can not normally send), therefore, in fact under power save mode, still adopt prior art; Link maintenance mechanism can't be realized, the problem that ONU is separated registration or service level link interruption might be occurred in this case.Yet requirements of saving energy is the registration that can not influence professional and ONU, and therefore, under power save mode, how keeping link becomes a problem to be solved, does not have effective solution at present as yet.
Summary of the invention
In view of this, main purpose of the present invention is to provide the method and system of keeping link under a kind of Ethernet passive optical network power save mode, can under power save mode, realize link maintenance.
For achieving the above object, technical scheme of the present invention is achieved in that
Keep the method for link under a kind of Ethernet passive optical network power save mode, this method comprises: optical network unit (ONU) is periodically revived at power save mode according to the wake-up period of acquiescence wake-up period or optical line terminal (OLT) configuration; Receive and send the Frame that is used to keep link when periodically reviving.
Wherein, said OLT is that the mode that said ONU disposes said wake-up period specifically comprises: OLT extended operation management maintenance (OAM) message adds the said wake-up period of configuration in the OAM message after the expansion, and is handed down to ONU.
Wherein, the wake-up period of said acquiescence wake-up period or configuration is kept the maximum transmission time interval of the Frame of link less than system requirements.
Wherein, the said periodicity implementation of reviving specifically comprises: the mode that triggers through timer or the overtime back of counter or the mode of ONU response OLT message.
Keep the system of link under a kind of Ethernet passive optical network power save mode, this system comprises: the dispensing unit and the first link maintenance unit; Wherein,
Dispensing unit, being used for OLT is ONU configuration wake-up period;
The first link maintenance unit, be used for ONU according to the wake-up period of acquiescence wake-up period or OLT configuration when power save mode is periodically revived, realize link maintenance through receiving and send the Frame that is used to keep link.
Wherein, said dispensing unit is further used for the message through OLT expansion OAM, the said wake-up period that disposes is added in the OAM message after expanding, and be handed down to the mode of ONU, realizes that said OLT is that said ONU disposes said wake-up period.
Wherein, the wake-up period of said acquiescence wake-up period or configuration is kept the maximum transmission time interval of the Frame of link less than system requirements.
Keep the method for link under a kind of Ethernet passive optical network power save mode, this method comprises: the transmission frequency that the protocol massages or the packet that are used to keep link between ONU and the OLT are set; When transmission is used to keep protocol massages or the packet of link, make the wake-up period of transmission time interval more than or equal to ONU according to the transmission frequency that is provided with.
Wherein, this method also comprises: said transmission time interval is set or adjusts said transmission time interval by ONU according to wake-up period through expansion OAM message by OLT.
Keep the system of link under a kind of Ethernet passive optical network power save mode, this system comprises: the unit and the second link maintenance unit are set; Wherein,
The unit is set, is used to be provided with the transmission frequency of the protocol massages or the packet that are used to keep link between ONU and the OLT;
The second link maintenance unit is used for making the wake-up period of transmission time interval more than or equal to ONU according to the transmission frequency that is provided with, and is used to keep the protocol massages or the packet realization link maintenance of link through transmission.
Wherein, the said second link maintenance unit is further used for said transmission time interval being set or adjusting said transmission time interval by ONU according to wake-up period through expansion OAM message by OLT.
The present invention has two sets of plan, and wherein a sets of plan comprises: ONU periodically revives at power save mode according to the wake-up period of acquiescence wake-up period or OLT configuration; Receive and send the Frame that is used to keep link when periodically reviving.
Adopt the present invention,,, also can under power save mode, periodically revive, can receive and send the Frame that is used to keep link, thereby the link maintenance that is implemented under the power save mode is machine-processed according to wake-up period even if be under the power save mode owing to there is wake-up period.
Description of drawings
Fig. 1 is the EPON network basic structure sketch map of prior art;
Fig. 2 is the flow chart of keeping the ONU of MPCP protocol link under sleep pattern for the embodiment of the invention one;
Fig. 3 is the flow chart of ONU of the link of keeping the operation layer agreement for the embodiment of the invention two under sleep pattern.
Embodiment
Basic thought of the present invention is: the present invention has two sets of plan, and wherein a sets of plan comprises: ONU periodically revives at power save mode according to the wake-up period of acquiescence wake-up period or OLT configuration; Receive and send the Frame that is used to keep link when periodically reviving.
Below in conjunction with accompanying drawing the enforcement of technical scheme is done further to describe in detail.
Keep the method for link under a kind of Ethernet passive optical network power save mode, this method mainly comprises following two aspect contents:
First aspect: ONU periodically revives at power save mode according to the wake-up period of acquiescence wake-up period or OLT configuration; Receive and send the Frame that is used to keep link when periodically reviving.
Further, OLT is that the mode of ONU configuration wake-up period comprises: OLT expansion OAM message, and with in the OAM message after the wake-up period adding expansion of configuration, and be handed down to ONU.Wherein, said OAM is the abbreviation of Operation, Administraion& Maintenance, refers to Operations, Administration and Maintenance.
Further, the wake-up period of acquiescence wake-up period or configuration is less than the maximum transmission time interval that system requirements is kept the Frame of link.
The implementation of further, periodically reviving comprises: through the mode of timer or counter overtime back triggering or the mode of ONU response OLT message.
Further, said power save mode comprises sleep pattern or multiple implementation such as the pattern of dozing off.Wherein, said sleep pattern refers to: the situation that the reception of ONU and transmission are all closed; The said pattern of dozing off refers to: the transmission of ONU is closed, and the reception of ONU is a situation about opening.
Corresponding above-mentioned implementation is kept the system of link under a kind of Ethernet passive optical network power save mode, this system comprises: the dispensing unit and the first link maintenance unit.Wherein, to be used for OLT be ONU configuration wake-up period to dispensing unit; The first link maintenance unit be used for ONU according to the wake-up period of acquiescence wake-up period or OLT configuration when power save mode is periodically revived, realize link maintenance through receiving and send the Frame that is used to keep link.
Here, dispensing unit is further used for the message through OLT expansion OAM, the wake-up period that disposes is added in the OAM message after expanding, and be handed down to the mode of ONU, realizes that OLT is an ONU configuration wake-up period.
Here, the wake-up period of acquiescence wake-up period or configuration is kept the maximum transmission time interval of the Frame of link less than system requirements.
Second aspect: the transmission frequency that the protocol massages or the packet that are used to keep link between ONU and the OLT are set; When transmission is used to keep protocol massages or the packet of link, make the wake-up period of transmission time interval more than or equal to ONU according to the transmission frequency that is provided with.
Further, transmission time interval can be provided with through expansion OAM message by OLT, also can be adjusted according to wake-up period by ONU.Thereby guarantee that the packet that sends between ONU and the OLT can satisfy the requirement of keeping link.
Here it is to be noted: the wake-up period that this paper relates to is not limited to present description, as long as the description that can realize this wake-up period function is all in protection scope of the present invention, such as wake-up period, wakeup time at interval or the like.
Corresponding above-mentioned implementation is kept the system of link under a kind of Ethernet passive optical network power save mode, this system comprises: the unit and the second link maintenance unit are set.Wherein, the transmission frequency that the unit is used to be provided with the protocol massages or the packet that are used to keep link between ONU and the OLT is set; The second link maintenance unit is used for making the wake-up period of transmission time interval more than or equal to ONU according to the transmission frequency that is provided with, and is used to keep the protocol massages or the packet realization link maintenance of link through transmission.
Here, the second link maintenance unit is further used for transmission time interval being set or adjusting transmission time interval by ONU according to wake-up period through expansion OAM message by OLT.
In sum, the present invention is a kind of scheme that under power save mode, realizes link maintenance mechanism, can satisfy the needs of energy saving of system on the one hand, can close the reception and/or the transmission of optical module in sleep or in the time of dozing off, to reach purpose of energy saving.Cooperate the link maintenance mechanism of medium access control (MAC layer) and operation layer simultaneously, avoid occurring the situation that ONU separates registration or professional chain rupture.
Below to the present invention's elaboration of giving an example.
Embodiment one: under sleep pattern, be the flow process of keeping the ONU of MPCP protocol link, the link mechanism of keeping that is used for assurance MPCP agreement under sleep pattern is normally moved.What it is pointed out that this paper relates to the MPCP agreement all is the link maintenance mechanism to the MAC layer, does not give unnecessary details.
Flow process as shown in Figure 2 may further comprise the steps:
The ONU of step 101:EPON system starts power save mode.
Step 102:ONU gets into sleep pattern, closes the transmission and the receiving function of optical module.
Step 103:ONU starts timer T when getting into sleep pattern.
Step 104: judge whether timer T is overtime, if then execution in step 105; Otherwise, wait for, continue to judge whether timer T is overtime.
Step 105:ONU receives the GATE frame from OLT after timer T is overtime.
Step 106: judged whether uplink traffic, if then execution in step 107; Otherwise, execution in step 108.
Step 107: if uplink traffic is arranged, then send corresponding REPORT frame, to be reached for the purpose that ONU distributes upstream bandwidth according to the rule of Dynamic Bandwidth Allocation (DBA, Dynamic BandwidthAllocation); Execution in step 102 afterwards.
Step 108: if there is not uplink traffic, then in the time slot of GATE frame regulation, send empty REPORT frame to OLT, this empty REPORT frame is the Frame that is used to keep link; Execution in step 102 afterwards.
Here, in the present embodiment, the time-out time of timer T should be accepted at interval less than the maximum REPORT frame of OLT regulation, can be 50ms with the value default setting of timer T.
Here, in the present embodiment, OLT can be through the value of expansion OAM message arrangement timer T.The form of expansion OAM message is as shown in table 1, wraps the table of frame format for the expansion OAM that disposes wake-up period.
| Octet(s) | Field | Notes |
| 1 | Branch(0XC9) | The operation of expansion |
| 2 | Leaf (undetermined) | The notification message of configuration ONU wake-up period under sleep mode |
| 1 | Variable?Width | When being used to indicate Variable value field length, its value is 04 |
| 4 | Wake-up period | The time that sign ONU keeps in quick sleep state, unit is ms |
Table 1
Octet in the table 1 (s) representes byte; Branch representes variable portion; Leaf representes the variable page or leaf; VariableWidth representes the variable width.
Embodiment two: under sleep pattern, be the flow process of ONU of the link of keeping the operation layer agreement, be used under sleep pattern, guaranteeing that the link mechanism of keeping of operation layer agreement normally moves.
Because if the link mechanism of keeping of MPCP uses the additive method except that the foregoing description one to carry out link maintenance; Perhaps system has taked to close the MPCP timer; The mode of intervening the MPCP state machine; Wrap and also can normally move even make the link maintenance mechanism of MPCP not receive and dispatch GATE and REPORT at the appointed time, then the PON system only need guarantee that the link mechanism of keeping of operation layer agreement normally moves.
Flow process as shown in Figure 3 may further comprise the steps:
The ONU of step 201:EPON system starts power save mode.
Step 202:ONU gets into sleep pattern, closes the transmission and the receiving function of optical module.
Step 203:ONU starts timer T when getting into sleep pattern.
Step 204: judge whether timer T is overtime, if then execution in step 205; Otherwise, wait for, continue to judge whether timer T is overtime.
Step 205:ONU receives the GATE frame from OLT after timer T is overtime.
Step 206:ONU sends the up protocol frame that is used to keep link in the time slot of GATE frame regulation; Execution in step 202 afterwards.
Here, in the present embodiment, OLT should send the GATE frame to ONU before timer expiry, guaranteed that the up protocol frame of ONU can send.
Here, in the present embodiment, the time-out time of timer T should be kept isl frame less than the maximum of agreement regulation and accept at interval.For different protocol, the default value of timer T is different, can be 50ms with the value default setting of timer T.
Here, in the present embodiment, OLT can be through the value of expansion OAM message arrangement timer T.The form of expansion OAM is shown in above-mentioned table 1.
Embodiment three: to the pattern of dozing off, adopt the mode of ONU response OLT message, be used under the pattern of dozing off, guaranteeing that the link mechanism of keeping of MPCP agreement and other agreements normally moves.The flow process of present embodiment may further comprise the steps:
Step 301:EPON ONU starts power save mode, gets into the pattern of dozing off, and closes the sending function of optical module.
The step 302:OLT packet that transmission regularly is used to keep link during ONU dozes off is to ONU.
Step 303:ONU during the pattern of dozing off to from OLT require the link maintenance packet of ONU response the time temporarily open ONU data send, respond.
Here, keep the link data bag and comprise that MPCP keeps the message and two kinds of the expansion OAM message that is used for query State of link.Expansion OAM message definition is shown in following table 2, and the packet of keeping link for configuration sends the table of the expansion OAM bag frame format in cycle.
| Octet(s) | Field | ?Notes |
| 1 | Branch(0XC9) | The operation of expansion |
| 2 | Leaf (undetermined) | The transmission cycle that the link data bag is kept in configuration |
| 1 | Variable?Width | When being used to indicate Variable value field length, its value is 04 |
| 4 | The transmission cycle | In the transmission cycle that sign ONU keeps the link data bag, unit is ms |
Table 2
Here, OLT during ONU dozes off, regularly send the packet that is used to keep link give ONU realization can through but be not limited to following mode:
Mode one: at set inside timer or the counter of OLT, certain numerical value triggering OLT of timer expiry or counter arrival sends the packet of keeping link and gives ONU.
Mode two: OLT receives business module control to issue the packet that is used to keep link.
Mode three: OLT receives to control from the message of upper layer device, issues the packet that is used to keep link.
Embodiment four: the mode of under sleep pattern, sending frequency with adjustment MPCP message is kept the flow process of the ONU of MPCP protocol link, is used under sleep pattern, and the mode of sending frequency with adjustment MPCP message guarantees that the link mechanism of keeping of MPCP agreement normally moves.The flow process of present embodiment is similar to the flow process of the foregoing description one, and difference is that present embodiment need adjust the transmission frequency, and the foregoing description one does not need, and sends frequency and fixes.
The flow process of present embodiment may further comprise the steps:
Step 401:EPON ONU starts power save mode, and the frequency that transmission is used to keep the GATE frame of link is adjusted to every 200ms once.The last every separated 200ms of MPCP state machine of OLT sends a GATE frame to ONU.
Step 402:ONU gets into sleep pattern, closes the transmission and the receiving function of optical module.
Step 403:ONU starts timer T when getting into sleep pattern, time-out time is 200ms.
Step 404:ONU receives the GATE frame from OLT behind timer expiry.
Step 405:, then in the time slot of GATE frame regulation, send empty REPORT frame to OLT if there is not uplink traffic; Get back to step 402.
Step 406:, then send corresponding REPORT frame according to the rule of DBA if uplink traffic is arranged.Get back to step 402.
In the present embodiment, the mode of ONU acquisition timer T time-out time includes but not limited to following two kinds:
Mode one, OLT send to ONU through expansion OAM message, and expansion OAM message is as shown in table 2.
Mode two, ONU obtain according to wake-up period length.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (11)
1. keep the method for link under the Ethernet passive optical network power save mode, it is characterized in that this method comprises: optical network unit (ONU) is periodically revived at power save mode according to the wake-up period of acquiescence wake-up period or optical line terminal (OLT) configuration; Receive and send the Frame that is used to keep link when periodically reviving.
2. method according to claim 1; It is characterized in that; Said OLT is that the mode that said ONU disposes said wake-up period specifically comprises: OLT extended operation management maintenance (OAM) message adds the said wake-up period of configuration in the OAM message after the expansion, and is handed down to ONU.
3. method according to claim 1 and 2 is characterized in that, the wake-up period of said acquiescence wake-up period or configuration is kept the maximum transmission time interval of the Frame of link less than system requirements.
4. method according to claim 1 is characterized in that, the implementation that said periodicity is revived specifically comprises: through the mode of timer or counter overtime back triggering or the mode of ONU response OLT message.
5. keep the system of link under the Ethernet passive optical network power save mode, it is characterized in that this system comprises: the dispensing unit and the first link maintenance unit; Wherein,
Dispensing unit, being used for OLT is ONU configuration wake-up period;
The first link maintenance unit, be used for ONU according to the wake-up period of acquiescence wake-up period or OLT configuration when power save mode is periodically revived, realize link maintenance through receiving and send the Frame that is used to keep link.
6. system according to claim 5 is characterized in that, said dispensing unit; Be further used for message through OLT expansion OAM; The said wake-up period of configuration is added in the OAM message after expanding, and be handed down to the mode of ONU, realize that said OLT is that said ONU disposes said wake-up period.
7. according to claim 5 or 6 described systems, it is characterized in that the wake-up period of said acquiescence wake-up period or configuration is kept the maximum transmission time interval of the Frame of link less than system requirements.
8. keep the method for link under the Ethernet passive optical network power save mode, it is characterized in that this method comprises: the transmission frequency that the protocol massages or the packet that are used to keep link between ONU and the OLT are set; When transmission is used to keep protocol massages or the packet of link, make the wake-up period of transmission time interval more than or equal to ONU according to the transmission frequency that is provided with.
9. method according to claim 8 is characterized in that, this method also comprises: said transmission time interval is set or adjusts said transmission time interval by ONU according to wake-up period through expansion OAM message by OLT.
10. keep the system of link under the Ethernet passive optical network power save mode, it is characterized in that this system comprises: the unit and the second link maintenance unit are set; Wherein,
The unit is set, is used to be provided with the transmission frequency of the protocol massages or the packet that are used to keep link between ONU and the OLT;
The second link maintenance unit is used for making the wake-up period of transmission time interval more than or equal to ONU according to the transmission frequency that is provided with, and is used to keep the protocol massages or the packet realization link maintenance of link through transmission.
11. system according to claim 10 is characterized in that, the said second link maintenance unit is further used for said transmission time interval being set or adjusting said transmission time interval by ONU according to wake-up period through expansion OAM message by OLT.
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| CN2010102825373A CN102404188A (en) | 2010-09-14 | 2010-09-14 | Method and system capable of maintaining link in energy saving state of Ethernet passive optical network |
| PCT/CN2011/071624 WO2012034384A1 (en) | 2010-09-14 | 2011-03-09 | Method and system for link maintenance under energy-saving state in ethernet passive optical networks |
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| CN103347221B (en) * | 2013-07-04 | 2016-08-10 | 北京邮电大学 | A kind of threshold values discussion power-economizing method for EPON (Ethernet Passive Optical Network) |
| CN105049115A (en) * | 2015-08-17 | 2015-11-11 | 上海斐讯数据通信技术有限公司 | EPON-based hibernation method and system |
| CN105049115B (en) * | 2015-08-17 | 2017-09-19 | 上海斐讯数据通信技术有限公司 | A kind of dormancy method and system based on EPON |
| CN109479023A (en) * | 2016-07-22 | 2019-03-15 | 日本电信电话株式会社 | Link control circuitry |
| CN109479023B (en) * | 2016-07-22 | 2021-11-23 | 日本电信电话株式会社 | Link control circuit |
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| WO2012034384A1 (en) | 2012-03-22 |
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