CN102648590A - Method, system and device for communication in the optical network system - Google Patents

Method, system and device for communication in the optical network system Download PDF

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Publication number
CN102648590A
CN102648590A CN2011800006604A CN201180000660A CN102648590A CN 102648590 A CN102648590 A CN 102648590A CN 2011800006604 A CN2011800006604 A CN 2011800006604A CN 201180000660 A CN201180000660 A CN 201180000660A CN 102648590 A CN102648590 A CN 102648590A
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line terminal
optical network
optical line
optical
terminal port
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CN102648590B (en
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万民
韦永泉
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1652—Optical Transport Network [OTN]
    • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)

Abstract

A method, system and device for data communication in an optical network system are provided in the embodiment of the present invention. After the communication between the central office and multiple optical network units (ONUs) is switched to a second optical line terminal (OLT) port from a first OLT port, a downlink frame, which indicates that at least one ONU sends a uplink frame with a first preamble, is sent to at least one optical network unit (ONU) via the second OLT port; or, a deactivation message or a message carrying a reassigned ONU identifier are sent to at least one ONU. The present invention implements that the switched optical network system even without supporting a POPUP message can also perform ranging again.; Moreover, the data communication between the switched OLT and the ONU can swiftly recovered, the influence for the normal service communication after being switched can be avoided, the switching delay is decreased, and the user satisfaction is improved.

Description

Method, system and device for communication in the optical network system
Communication means, system and the engineering device technique field of optical network system
The present invention relates to communication technical field, more particularly to a kind of communication means of optical network system, system and device.Background technology
EPON（Passive Optical Network, PON) technology is one of current most widely used fiber to the home (Fiber To The Home, FTTH) technology.Existing PON includes BPON（Broadband Passive Optical Network, BPON), gigabit passive optical network（Gigabit-capable Passive Optical Network, GPON) and ethernet passive optical network（Ethernet Passive Optical Network, EPON), and 10 Gigabit-capable Passive Optical Network (10 Gigabit-capable Passive Optical Networks, XG-P0N).
Traditional PON system mainly includes：Optical line terminal（Optical Line Terminal, OLT), optical network unit (Optical Network Unit, 0NU) standing grain mouthful optical distribution network (Optical Distribution Network, the part such as 0DN), wherein, optical distribution network includes trunk optical fiber, passive optical splitter and branch optical fiber.Connected between 0LT and passive optical splitter by trunk optical fiber, optical branching device realizes the optical power fluctuation of point-to-multipoint, and is connected to multiple 0NU by multiple branch optical fibers.Wherein, the direction from 0LT to 0NU is referred to as down direction, and the direction from 0NU to 0LT is referred to as up direction.
The up direction of P0N systems generally uses time division multiple acess (Time Division Multiple Address, TDMA) multiplex mode, and each 0NU sends uplink data messages in the OLT time slots specified；And down direction 0LT is using time division multiplexing（Time Division Multiplexing, TDM) broadcast mode sends downlink data message to each 0NU, the optical signal for carrying all 0NU downlink data message is divided into several pieces at 0DN optical branching device, and each 0NU is reached through each branch optical fiber.
Wherein, in GP0N systems, when the optical fiber between primary 0LT and 0NU breaks down, shellfish l " 0LT and 0NU can detect LOS (lost of signal, dropout because not receiving the signal of other side）Alarm；Primary 0LT detects L0S alarms, and explanation is primary trunk optical fiber failure, it is necessary to carry out active and standby 0LT switchings, all 0NU is switched on standby 0LT, standby 0LT originally is switching to primary OLT.0NU is detected after L0S alarms, and POPUP states are switched to by normal OPERATION states, stops sending upstream data；Primary 0LT is to all 0NU broadcast transmissions POPUP message, and it is RANGING states by POPUP State Transferrings to notify 0NU, starts all 0NU processing of ranging again；Under primary 0LT control, serial mode completes all 0NU ranging processing, recovers to recover data communication between 0LT and 0NU.
During the present invention is realized, inventor has found that prior art at least has problems with：
When the optical fiber between primary 0LT and 0NU breaks down, need to carry out ranging again to each 0NU after the switching of active and standby bone optical fiber, because XGP0N systems or other optical network systems do not support POPUP message, then 0NU cannot be introduced into distance measuring states again, And then cause ONU can not obtain accurately balanced time delay, cause the communication disruption between 0LT and 0NU after masterslave switchover.The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of communication means of optical network system, system and device, carried out for solving 0LT in existing optical network system after masterslave switchover, due to not supporting POPUP message, cause the problem of data communication between 0LT and 0NU is interrupted, so as to avoid the influence after switching to normal traffic communication, the satisfaction of user is improved.
To solve the above problems, the embodiments of the invention provide a kind of communication means of optical network system, the local side of the optical network system provides the first optical line terminal port and the second optical line terminal port, and each optical line terminal port connects multiple optical network units, and methods described includes：
After the communication of local side and multiple optical network units is switched to the second optical line terminal port from the first optical line terminal port, downlink frame is sent at least one optical network unit by second optical line terminal port, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission；
At least one described optical network unit of detection includes the first leading uplink frame by what second optical line terminal port was sent, and the first leading uplink frame is included based on described, obtains the balanced time delay of at least one optical network unit；The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
The embodiment of the present invention additionally provides the communication means of another optical network system, and methods described includes：
Based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；
The second optical line terminal port is switched to from the first optical line terminal port, receive the downlink frame from the second optical line terminal port, the downlink frame indicates that uplink frame is leading using first, wherein the described first leading length is more than the second leading length for uplink traffic transmission；
Sent to the second optical line terminal port and include the first leading uplink frame；
Receive the second balanced time delay from the second optical line terminal port；
Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.
The present invention also provides the communication means of another optical network system, and the local side of the optical network system provides the first optical line terminal port and the second optical line terminal port, and each optical line terminal port connects multiple optical network units, and methods described includes：After the communication of local side and multiple optical network units is switched to the second optical line terminal port from the first optical line terminal port, the optical network unit mark for deactivating that message or transmission carrying are redistributed is sent by second optical line terminal port The message of knowledge gives at least one optical network unit so that at least one described optical network unit is offline；
Again ranging is carried out at least one described optical network unit, the first balanced time delay of at least one optical network unit is obtained；
The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
The embodiment of the present invention additionally provides a kind of communication means of optical network system, and methods described includes：
Based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；
The second optical line terminal port is switched to from the first optical line terminal port, the deactivation message from the second optical line terminal port is received or carries the message for the optical network unit marks redistributed；
According to the deactivation message, carry out offline；
Re-start after ranging, receive the second balanced time delay from the second optical line terminal port；
Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.The embodiments of the invention provide a kind of optical network system, the system includes：First optical line terminal port and the second optical line terminal port, optical line terminal connect multiple optical network units by each optical line terminal port；
The optical line terminal, for the communication when optical line terminal and multiple optical network units from the first optical line terminal port be switched to the second optical line terminal port after, downlink frame is sent at least one optical network unit by second optical line terminal port, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission；At least one described optical network unit of detection includes the first leading uplink frame by what second optical line terminal port was sent, and the first leading uplink frame is included based on described, obtains the balanced time delay of at least one optical network unit；The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
At least one described optical network unit, for based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；The second optical line terminal port is switched to from the first optical line terminal port, receive the downlink frame from the second optical line terminal port, the downlink frame indicates that uplink frame is leading using first, wherein the described first leading length is more than the second leading length for uplink traffic transmission；Sent to the second optical line terminal port and include the first leading uplink frame；Receive the second balanced time delay from the second optical line terminal port；Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.
The embodiment of the present invention additionally provides another optical network system, and the system includes：First optical line terminal port and Two optical line terminal ports, optical line terminal connects multiple optical network units by each optical line terminal port；The optical line terminal, for the communication when optical line terminal and multiple optical network units from the first optical line terminal port be switched to the second optical line terminal port after, the message for sending the optical network unit marks that deactivation message or transmission carrying are redistributed by second optical line terminal port gives at least one optical network unit so that at least one described optical network unit is offline；Again ranging is carried out at least one described optical network unit, the first balanced time delay of at least one optical network unit is obtained；The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port；
The optical network unit, for based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；The second optical line terminal port is switched to from the first optical line terminal port, the deactivation message from the second optical line terminal port is received or carries the message for the optical network unit marks redistributed；According to the deactivation message, carry out offline；Re-start after ranging, receive the second balanced time delay from the second optical line terminal port；Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.
The embodiments of the invention provide a kind of optical line terminal, the optical line terminal includes：
First transmitting element, for the communication when the optical line terminal and multiple optical network units from the first optical line terminal port be switched to the second optical line terminal port after, downlink frame is sent at least one optical network unit by second optical line terminal port, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission；
First acquisition unit, for detect at least one described optical network unit by second optical line terminal port sends comprising the first leading uplink frame；The first leading uplink frame is included based on described, the balanced time delay of at least one optical network unit is obtained；
Second transmitting element, for the balanced time delay of at least one optical network unit to be sent at least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
The embodiment of the present invention additionally provides a kind of optical network unit, and the optical network unit includes：
Receiving unit, for based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；The second optical line terminal port is switched to from the first optical line terminal port, receive the downlink frame from the second optical line terminal port, the downlink frame indicates that uplink frame is leading using first, wherein the described first leading length is more than the second leading length for uplink traffic transmission； 5th transmitting element, the first leading uplink frame is included for being sent to the second optical line terminal port；Second receiving unit, for receiving the second balanced time delay from the second optical line terminal port；Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.
The embodiment of the present invention additionally provides a kind of optical line terminal, and the optical line terminal includes：
3rd transmitting element, for the communication when the optical line terminal and multiple optical network units from the first optical line terminal port be switched to the second optical line terminal port after, the message for sending the optical network unit marks that deactivation message or transmission carrying are redistributed by second optical line terminal port gives at least one optical network unit so that at least one described optical network unit is offline；
4th acquiring unit, for carrying out ranging again at least one described optical network unit, obtains the first balanced time delay of at least one optical network unit；
4th transmitting element, for the balanced time delay to be sent at least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with the second optical line terminal end P.
The method of data communication in a kind of optical network system provided in an embodiment of the present invention, system and device, after the communication of local side and multiple optical network units is switched to the second optical line terminal port from the first optical line terminal port, downlink frame is sent at least one optical network unit by second optical line terminal port, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, or, the message for sending the optical network unit marks that deactivation message or transmission carrying are redistributed gives at least one optical network unit, realize that optical network system is not even if supporting the POPUP message can also to carry out distance measuring states again after handover, and then the data communication after fast quick-recovery switching between 0LT and 0NU, avoid the influence to normal traffic communication after switching, reduce handoff delay, improve the satisfaction of user.Brief description of the drawings is in order to illustrate the technical solution of the embodiments of the present invention more clearly, the accompanying drawing used required in being described below to embodiment is briefly described.It should be evident that drawings in the following description are only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of data communications method flow chart of optical network system provided in an embodiment of the present invention；
Fig. 2 is a kind of view of optical network unit provided in an embodiment of the present invention；
Fig. 3 is a kind of specific method flow chart of the data communications method of optical network system provided in an embodiment of the present invention； Fig. 4 is a kind of structural representation of descending XGTC frames provided in an embodiment of the present invention；
Fig. 5 is BWMAP structural representations in a kind of descending XGTC frame structures provided in an embodiment of the present invention；
Fig. 6 is another optical network system data communications method flow chart provided in an embodiment of the present invention；
Fig. 7 is a kind of structural representation of optical network system provided in an embodiment of the present invention；
Fig. 8 is a kind of structural representation of optical line terminal provided in an embodiment of the present invention；
Fig. 9 is a kind of structural representation of optical network unit provided in an embodiment of the present invention；
Figure 10 is the structural representation of another optical line terminal provided in an embodiment of the present invention.The technical scheme in the embodiment of the present invention is clearly and completely described below in conjunction with the accompanying drawing in the embodiment of the present invention for embodiment.Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of protection of the invention.
Fig. 1 is a kind of data communications method flow chart of passive optical network provided in an embodiment of the present invention.As shown in figure 1, the method for the embodiment of the present invention may include steps of：
The local side of the optical network system provides the first 0LT ports and the 2nd 0LT ports, and each 0LT port connects multiple 0NU, and methods described includes：
Step S102, after local side and multiple 0NU communication are switched to the 2nd 0LT ports from the first 0LT ports, downlink frame is sent at least one 0NU by the 2nd 0LT ports, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission.
Further, the optical network system can be 10 Gigabit-capable Passive Optical Network XG-P0N systems（Or it is abbreviated as XGP0N), the XGP0N systems include：XGP0N1 systems and XGP0N2 systems, the two systems are that Gigabit-capable Passive Optical Network NGP0N 1 of future generation (is properly termed as " gigabit passive optical network of future generation " again）Two leading candidate frameworks.XGP0N1 is up 2. 5Gbps of descending lOGbps/ asymmetric system；XGP0N2 is up-downgoing lOGbps balanced system.Wherein XGP0N1 systems are asymmetric system, are referred to as 10GGP0N;The local side is network side equipment, is such as 0LT for ustomer premises access equipment.What the embodiment of the present invention was only illustrated by taking 0NU as an example, all methods suitable for 0NU are suitable for 0NT.
Further, the downlink frame can be XGTC frames.Uplink burst in the downlink frame（Frame）Template Burst Profi le fields are set to first leading, and long preambles are properly termed as again（It is referred to as long frame head）, in the downlink frame It is leading and second leading that Burst Profile fields include first（It is properly termed as short leading or short frame head）, wherein the described first leading length is more than the second leading length for uplink traffic transmission, the field is used for the uplink frame for indicating which kind of lead code preamble bytes at least one optical network units is used using.Wherein, the Burst Profile fields are located in the frame head of downlink frame；Described first it is leading for 0NU enter distance measuring states be 04 state when use it is leading；Described second it is leading for 0NU be in running status be 05 state when use it is leading.
Further, the 0LT also includes before downlink frame is sent：Upstream bandwidth authorization messages are generated, the authorization messages include the bandwidth information and lead code Template Information for indicating uplink frame, and lead code Template Information indicates that at least one described optical network unit uses the first leading transmission uplink frame；Upstream bandwidth authorization messages are encapsulated into the downlink frame.
At least one described ONU of step S104, the 0LT detection includes the first leading uplink frame by what the 2nd 0LT ports were sent.
Step S106, the 0LT include the first leading uplink frame based on described, obtain the balanced time delay of at least one optical network unit.
The balanced time delay is sent at least one described optical network unit by step S108, the 0LT by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
Further, methods described also includes：The balanced time delay that the 0LT is sent based on second optical line terminal port, obtains the balanced time delay of other optical network units in the multiple optical network unit；The balanced time delay of other optical network units is sent to corresponding other optical network units；Or,
The balanced time delay that the 0LT is sent based on second optical line terminal port, obtains the balanced delay skew of at least one optical network unit, and the balanced time shift skew is sent to other optical network units in the multiple optical network unit.
Wherein, the 0LT obtains the balanced delay skew of at least one optical network unit, and the balanced time shift skew is sent into other optical network units in the multiple optical network unit specifically includes two ways：
One is, the 0LT at least one 0NU according to being sent to by the first sending port the first balanced time delay EqDl, and be sent to by the second sending port after the second balanced time delay EqD2 of at least one ONU, calculate EqDl and EqD2 EqD skews, now the EqD skews can be evaluated whether to be switched to the EqD deviations of each 0NU behind the 2nd 0LT ports from the first 0LT ports, according to the EqD deviations, and then calculate the EqD of other each 0NU in optical network system, and the EqD is handed down to each corresponding 0NU by the 2nd 0LT ports with mode of unicast.
Secondly being, 0LT is calculated after EqD deviations, is handed down to other 0NU in optical network system by the 2nd 0LT ports with broadcast mode, other 0NU are according to EqD deviations, the EqD after switching is each calculated, and then based on the EqD after the switching Communicated by the 2nd OLT ports with the OLT.
Relative to above-mentioned communication means, for 0NU, the method performed in 0NU sides includes：
0NU is based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；
The second optical line terminal port is switched to from the first optical line terminal port, 0NU receives the downlink frame from the second optical line terminal port, the downlink frame indicates that uplink frame is leading using first, wherein the described first leading length is more than the second leading length for uplink traffic transmission；
0NU sends to the second optical line terminal port and includes the first leading uplink frame；
0NU receives the second balanced time delay from the second optical line terminal port；
0NU is based on the described second balanced time delay and the communication of the second optical line terminal port to carry out business transmission.
The method of data communication in a kind of optical network system provided in an embodiment of the present invention, after the communication of local side and multiple optical network units is switched to the second optical line terminal port from the first optical line terminal port, downlink frame is sent at least one optical network unit by second optical line terminal port, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission；At least one described optical network unit of detection includes the first leading uplink frame by what second optical line terminal port was sent, and the first leading uplink frame is included based on described, obtains the balanced time delay of at least one optical network unit；The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port, realize that optical network system is not even if supporting the POPUP message can also to carry out distance measuring states again after handover, and then the data communication after fast quick-recovery switching between 0LT and 0NU, avoid the influence to normal traffic communication after switching, reduce handoff delay, improve the satisfaction of user, especially for XGP0N systems, the problem of further solving TYPE B masterslave switchovers in XGP0N systems.
Fig. 2 is a kind of view of optical network unit provided in an embodiment of the present invention, is specially the various views of the optical network unit in XGP0N systems.Below by taking XP0N systems as an example, it is described in detail by introducing the various views of 0NU in XP0N systems, and then to the communication means in above-mentioned optical network system.
As shown in Fig. 2 the state change of the 0NU has 6 states：
( 1 ) 01 - Initial state
Initial state, light, which is sent, closes, and the configuration parameters of all TC layer of transmission controls include 0NU-ID, and acquiescence or clear and definite bandwidth allocation mark Alloc-Id are that 0NU is identified, and when on 0NU is synchronous with downlink optical signal, are switched to 02_3 states.
( 2) 02-3 - Serial Number state
Sequence number SN states, 0NU activation optical sending functions, receive and learn Burst templates（That is the template of uplink burst frame） PLOAM message, when the ONU SN for receiving the known Burst templates of band open a window message, send an XGTC frame that physical layer operations management service PL0AM is responded with SN, now, 0NU ignore up dynamic bandwidth report DBRu mark and Bandwidth map mandate width BWMAP GrantSize regions.When 0NU receives distribution 0NU-IDs of the sequence number SN equal to the SN of oneself PL0AM message, 0NU enters 04 state.When receiving a SN and being equal to the SN of oneself non-enable sequence number Disable-Serial-Number PLOAM message, ONU enters 07 state.If 0LT has known ONU presence by certain mode, such as during power loss recovery, 0LT directly can distribute the ONU-ID PL0AM message with known ONU SN by one, so, 0NU can ignore 02-3 states, be directly entered 04 state.
( 3) 04 - Ranging state
Distance measuring states, if 0NU receives a distance measurement request with known template, respond an XGTC frame with registration Registration PLOAM, DBRu marks and GrantSize regions are ignored when ranging.The 0NU of 04 state responds following information：Template Prof i le (uplink burst frame templates）, ranging time Ranging-Time, deactivation optical-fiber network mark Deactivate -0NU-ID, non-enable sequence number Disable-Serial-Number.Timer T01 time-out, 0NU abandons optical network unit marks ONU-ID and the Alloc-ID and the optical network unit management control interface XGP0N encapsulation mode port-mark 0MCI XGEM port-ID of acquiescence of acquiescence, and enter 02-3 states, retain uplink burst frame BurstFrame Template Informations.When 0NU receives the balanced time delay EqD message of absolute value, into 05 state.If having crossed 0NU round-trip delay RTD before 0LT after tested in SN confirmations or early stage 0NU activation, so 0LT can directly issue a ranging time Ranging-Time message, so, 0NU can directly through 04 state enter 05 state and without ranging process.
(4) 05 - Operation state
Running status, now 0NU, which is in, enters row data communication between normal operating condition, with 0LT.
( 5) 06 - Intermittent L0DS state
Interrupt signal lost condition, if descending dropout L0DS states are recovered before timer T02 time-out, then return to 05 state, if recovered before T02 time-out without L0DS, then enter 01 state.
(6) 07 - Emergency Stop state
Emergency stop conditions, 0NU, which is received, does not enable sequence number Disable SN message（Field configuration is enabled not enable）, close and send light, the configuration parameter of TC layers of transmission includes：Optical network unit marks 0NU-ID, all allocation identification Alloc-ID, XGEM Port-ID, the burst templates of acquiescence, EqD all discardings.In 07 state, 0NU keeps down-going synchronous, parses descending PL0AM message, forbids down forwarding data and uplink data sending.After enabling again, 0LT sends non-enable sequence number Disable SN message（" enable " field configuration is enable）, 0NU should enter 01 state and to reach the standard grade again.When 07 state 0NU is restarted, 0NU should be maintained at 07 state. Timer T01 Ranging timer are ranging overtime timer, it is ensured that ONU can not be in the distance measuring states too long of time, and standard suggestion is 10 seconds, and distance measuring states overtime timer will be stopped in 05 state；Timer T02 L0DS timer lose for downstream signal（Loss of Downstream Signal, LODS) overtime timer, it is ensured that ONU is not at the 06 state too long of time, and the time of 06 state of standard suggestion is 100ms.
With reference to Fig. 2 0NU state diagrams, a kind of specific method flow of the data communications method of passive optical network provided in an embodiment of the present invention shown in Fig. 3 is described in detail, the method for the embodiment of the present invention may include steps of：
Step S302, when between 0LT and 0NU optical fiber break down, 0LT detects dropout L0S alarms, start switching flow, the 0LT is switched to the 2nd 0LT ports from the first 0LT ports, and all 0NU are switched on the 2nd 0LT ports.
Further, before switching, the first 0LT ports do not have uplink optical signal; then the 0LT judges to enter TYPE B protection flows; masterslave switchover is carried out, the first 0LT ports are switched to the 2nd 0LT ports, then all 0NU are switched on the 2nd 0LT ports.
Step S304,0NU is detected after LODS alarms, and the 0NU is switched to Intermittent LODS State states by normal Operation State, stops sending upstream data.
0NU in this step can detect L0DS at least one 0NU, and the 0NU is transferred to 06 state from 05 state, and other 0NU also carry out similar operations respectively（As shown in Figure 4）.
Step S306, the descending of the 2nd 0LT ports light（Do not distribute bandwidth）, all upstream bandwidths are closed, after waiting for a period of time, 0NU enters Operation State from Intermittent LODS State.
According to Fig. 2 ONU state diagrams, after any one 0NU detects LODS alarms, advance to 06 state, and start T02 timers, if TO2 timers detect L0DS alarm clearing before having not timed out, then the 0NU jumps directly to 05 state, if timer expiry does not recover yet, into 01 state.
Step S308,0LT selects at least one 0NU from the 0NU for entering Operation State, downlink frame is sent at least one described 0NU, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission.
Here reentering the 0NU of 05 state can have multiple, it can also be one, because the time that each 0NU enters 05 state differs, as long as so there is a 0NU to enter 05 state, 0LT just can perform step S208 to 0NU, certainly, 0LT can also select one or more to perform step S208 from multiple 0NU for entering 05 state.
Specifically, 0LT is selected after at least one 0NU, the Burst Prof ile fields in downlink frame are set to it is first leading, for indicating that selected 0NU uses the uplink frame using the first preamble.Wherein described Burst Profile fields are in the frame head part of downlink frame, below by taking the XGTC frames in XGP0N as an example, are discussed in detail and how to set Burst Prof ile fields Long preambles are set to, but the embodiment of the present invention is not limited to XGP0N systems, it is adaptable to any type of passive optical network.
Below by taking XG-P0N XGTC frames as an example, XGTC frame structure is described in detail, as shown in figure 4, Fig. 4 is the frame structure schematic diagram of descending XGTC frames.
Descending XGTC frames have 135432 bytes, including：XGTC frame heads and XGTC payloads payload, the XGTC header include：HLend, for characterizing BWmap number and PLOAM number；Bandwidth map BWmap and PL0AMd.Specific BWmap structures are as shown in Figure 5.One
Fig. 5 is BWmap structural representations, and BWmap includes：Distribution structure Allocation Structure, the number of the distribution structure changes with N change, specifically included：Uplink burst（Frame）Template Burst Profile, 2 bits, for indicating ONU uses the uplink frame of which kind of lead code, or to indicate 0NU uses the uplink frame of which kind of frame head（Here uplink frame is uplink burst frame）, general Burst Profile include：First is leading（It is referred to as long frame head or long preambles）It is leading with second（It is referred to as long frame head or long preambles and short frame head）, wherein the first leading 0LT that is used for registers discovery, it is
It is leading that 0NU is used when being 04 state into distance measuring states；Its length length more leading than second（Byte number Bite) it is long, typically at least above or equal to 8bits.Second it is leading used for proper communication or when carrying out the transmission of normal upstream business it is leading, i.e. 0NU is in used during 05 state leading.The Allocation Structure also include：Allocation identification
Alloc-ID, 4 bits, for identifying the upstream bandwidth that 0LT is distributed to 0NU；Flag bit Flags, 2 bits;Time started Start Time, 16 bits;Bandwidth authorizing length GrantSize, 16 bits;Power management identifies FWI, 1 bit;Error detection and correction the coding HEC, 13bits of Hlend structures.
Specifically used process is as follows：
Such as 0NU have recorded multiple bursts during reaching the standard grade（Frame）Template Burst Profile, after the downlink frame of 0LT transmissions is received, preserve the template.0NU parses the downlink frame according to descending PL0AM message, and it is " 00 " that such as 0NU, which receives PL0AM message " 0 PP ", represents leading（It can also be lead code）Leading for first, wherein lead code is 32 bytes, and delimiter is 4 bytes；If 0NU receives PL0AM message, " 1 PP " is " 01 ", and it is second leading to represent lead code, and lead code is 4 bytes, 4 bytes of delimiter.After 0LT carries out masterslave switchover, Burst Profile are set to first leading by 0LT in downlink frame, and the 0NU then by the up frame structure of " 00 " of PL0AM message definitions, is transmitted using the first of 32 bytes the leading uplink frame.
Embodiments of the invention are exactly that the Burst Profile fields in the frame head of descending XGTC frames are set into first is leading（Long frame head）So that 0NU uses the first leading uplink frame, it is easy to 0LT to receive after the uplink burst frame that 0NU is sent, can be leading according to described first, it is determined that receiving the position of the uplink frame after switching, so as to obtain 0NU EqD deviations, 0NU ranging process again is realized, solve in current P0N systems after masterslave switchover due to not supporting POPUP message so that 0LT and 0NU it Between data communication interrupt, improve the satisfaction of user.
Further, the 0LT also includes before downlink frame is sent：Upstream bandwidth authorization messages are generated, the authorization messages include the bandwidth information and lead code Template Information for indicating uplink frame, and lead code Template Information indicates that at least one described optical network unit uses the first leading transmission uplink frame；Upstream bandwidth authorization messages are encapsulated into the downlink frame.
At least one described 0NU of step S310,0LT detection includes the first leading uplink frame by what the 2nd 0LT was sent, and the first leading uplink frame is included based on described, obtains the balanced time delay of at least one optical network unit.
The balanced time delay is sent at least one described optical network unit by step S312, the 0LT by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with the second optical line terminal end P.The balanced time delay that the 0LT is sent based on second optical line terminal port, obtains the balanced time delay of other optical network units in the multiple optical network unit；The balanced time delay of other optical network units is sent to corresponding other optical network units；Or,
The balanced time delay that the 0LT is sent based on second optical line terminal port, obtains the balanced delay skew of at least one optical network unit, and the balanced time shift skew is sent to other optical network units in the multiple optical network unit.
Wherein, the 0LT obtains the balanced delay skew of at least one optical network unit, and the balanced time shift skew is sent into other optical network units in the multiple optical network unit specifically includes two ways：
One is, the 0LT at least one 0NU according to being sent to by the first sending port the first balanced time delay EqDl, and be sent to by the second sending port after the second balanced time delay EqD2 of at least one ONU, calculate EqDl and EqD2 EqD skews, now the EqD skews can be evaluated whether to be switched to the EqD deviations of each 0NU behind the 2nd 0LT ports from the first 0LT ports, according to the EqD deviations, and then calculate the EqD of other each 0NU in optical network system, and the EqD is handed down to each corresponding 0NU by the 2nd 0LT ports with mode of unicast.
Secondly being, 0LT is calculated after EqD deviations, other 0NU in optical network system are handed down to by the 2nd 0LT ports with broadcast mode, other ONU are according to EqD deviations, the EqD after switching is each calculated, and then is communicated based on the EqD after the switching by the 2nd 0LT ports with the 0LT.
Each 0NU EqD modes are wherein sent with mode of unicast, the message that can be returned by each 0NU is confirmed whether whether this masterslave switchover switches successfully.
In addition, after 0NU detect TYPE B pretection switch, the EqD values of P0N mouthfuls of original being removed immediately, default value 0 is reverted to.Ranging handling process when making the ranging after switching normally be reached the standard grade with 0NU is consistent.
The method of data communication in a kind of optical network system provided in an embodiment of the present invention, after the communication of local side and multiple optical network units is switched to the second optical line terminal port from the first optical line terminal port, passes through second optical line terminal port Downlink frame is sent at least one optical network unit, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission；At least one described optical network unit of detection includes the first leading uplink frame by what second optical line terminal port was sent, and the first leading uplink frame is included based on described, obtains the balanced time delay of at least one optical network unit；The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port, realize that optical network system is not even if supporting the POPUP message can also to carry out distance measuring states again after handover, and then the data communication after fast quick-recovery switching between 0LT and 0NU, avoid the influence to normal traffic communication after switching, reduce handoff delay, improve the satisfaction of user, especially for XGP0N systems, the problem of further solving TYPE B masterslave switchovers in XGP0N systems.
Fig. 6 is the data communications method flow chart of another optical network system provided in an embodiment of the present invention.As shown in fig. 6, the method for the embodiment of the present invention may include steps of：
The local side of the optical network system provides the first optical line terminal port and the second optical line terminal port, and each optical line terminal port connects multiple optical network units, and methods described includes：
Step S602, after the communication of local side and multiple optical network units is switched to the second optical line terminal port from the first optical line terminal port, the message that 0LT sends the optical network unit marks that deactivation message or transmission carrying are redistributed by second optical line terminal port gives at least one optical network unit so that at least one described optical network unit is offline.
Step S604, ranging again is carried out at least one described optical network unit, obtain the first balanced time delay of at least one optical network unit.
Step S606,0LT carries out ranging again to the optical network unit, obtains the first balanced time delay of the optical network unit.
The balanced time delay is sent at least one described optical network unit by step S608,0LT by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
The balanced time delay that the 0LT is sent based on second optical line terminal port, obtains the balanced time delay of other optical network units in the multiple optical network unit；The balanced time delay of other optical network units is sent to corresponding other optical network units；Or,
The balanced time delay that the 0LT is sent based on second optical line terminal port, obtains the balanced delay skew of at least one optical network unit, and the balanced time shift skew is sent to other optical network units in the multiple optical network unit.
Wherein, the 0LT obtains the balanced delay skew of at least one optical network unit, and the balanced time shift is offset The other optical network units sent in the multiple optical network unit specifically include two ways：
One is, the 0LT at least one 0NU according to being sent to by the first sending port the first balanced time delay EqDl, and be sent to by the second sending port after the second balanced time delay EqD2 of at least one ONU, calculate EqDl and EqD2 EqD skews, now the EqD skews can be evaluated whether to be switched to the EqD deviations of each 0NU behind the 2nd 0LT ports from the first 0LT ports, according to the EqD deviations, and then calculate the EqD of other each 0NU in optical network system, and the EqD is handed down to each corresponding 0NU by the 2nd 0LT ports with mode of unicast.
Secondly being, 0LT is calculated after EqD deviations, other 0NU in optical network system are handed down to by the 2nd 0LT ports with broadcast mode, other ONU are according to EqD deviations, the EqD after switching is each calculated, and then is communicated based on the EqD after the switching by the 2nd 0LT ports with the 0LT.
Each 0NU EqD modes are wherein sent with mode of unicast, the message that can be returned by each 0NU is confirmed whether whether this masterslave switchover switches successfully.
In addition, after 0NU detect TYPE B pretection switch, the EqD values of P0N mouthfuls of original being removed immediately, default value 0 is reverted to.Ranging handling process when making the ranging after switching normally be reached the standard grade with 0NU is consistent.
Subscriber terminal side corresponding with the above method is that the method that 0NU sides are used includes：
0NU is based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；
The second optical line terminal port is switched to from the first optical line terminal port, the deactivation message from the second optical line terminal port is received or carries the message for the optical network unit marks redistributed；
0NU is carried out offline according to the deactivation message；
0NU is re-started after ranging, receives the second balanced time delay from the second optical line terminal port；
0NU is based on the described second balanced time delay and the communication of the second optical line terminal port to carry out business transmission.
The method of data communication in another optical network system provided in an embodiment of the present invention, after the communication of local side and multiple optical network units is switched to the second optical line terminal port from the first optical line terminal port, the message for sending the optical network unit marks that deactivation message or transmission carrying are redistributed by second optical line terminal port gives at least one optical network unit so that at least one described optical network unit is offline；Again ranging is carried out at least one described optical network unit, the first balanced time delay of at least one optical network unit is obtained；The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port, realize that optical network system is not even if supporting the POPUP message can also to carry out distance measuring states again after handover, and then the data communication after fast quick-recovery switching between 0LT and 0NU, avoid the influence to normal traffic communication after switching, handoff delay is reduced, the satisfaction of user is improved. As shown in fig. 7, Fig. 7 is a kind of optical network system provided in an embodiment of the present invention, the system includes：First optical line terminal port and the second optical line terminal port, 0LT connect multiple 0NU by each optical line terminal port;
The optical line terminal, for the communication when optical line terminal and multiple optical network units from the first optical line terminal port be switched to the second optical line terminal port after, downlink frame is sent at least one optical network unit by second optical line terminal port, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission；At least one described optical network unit of detection includes the first leading uplink frame by what second optical line terminal port was sent, and the first leading uplink frame is included based on described, obtains the balanced time delay of at least one optical network unit；The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
At least one described optical network unit, for based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；The second optical line terminal port is switched to from the first optical line terminal port, receive the downlink frame from the second optical line terminal port, the downlink frame indicates that uplink frame is leading using first, wherein the described first leading length is more than the second leading length for uplink traffic transmission；Sent to the second optical line terminal port and include the first leading uplink frame；Receive the second balanced time delay from the second optical line terminal port；Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.
The optical line terminal, it is additionally operable to generate upstream bandwidth authorization messages, the authorization messages include the bandwidth information and lead code Template Information for indicating uplink frame, and lead code Template Information indicates that at least one described optical network unit uses the first leading transmission uplink frame；Upstream bandwidth authorization messages are encapsulated into the downlink frame.
The optical line terminal, is additionally operable to the balanced time delay sent based on second optical line terminal port, obtains the balanced time delay of other optical network units in the multiple optical network unit；The balanced time delay of other optical network units is sent to corresponding other optical network units.
The optical line terminal, it is additionally operable to the balanced time delay sent based on second optical line terminal port, the balanced delay skew of at least one optical network unit is obtained, the balanced time shift skew is sent to other optical network units in the multiple optical network unit.
Also include between 0LT and 0NU including Optical Distribution Network 0DN, the 0DN：Trunk optical fiber and branch optical fiber.
The embodiment of the present invention also provides another optical network system, and the system includes：First optical line terminal port and the second optical line terminal port, optical line terminal connect multiple optical network units by each optical line terminal port；
The optical line terminal, for the communication when optical line terminal and multiple optical network units from the first optical line terminal port It is switched to after the second optical line terminal port, the message for sending the optical network unit marks that deactivation message or transmission carrying are redistributed by second optical line terminal port gives at least one optical network unit so that at least one described optical network unit is offline；Again ranging is carried out at least one described optical network unit, the first balanced time delay of at least one optical network unit is obtained；The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port；
The optical network unit, for based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；The second optical line terminal port is switched to from the first optical line terminal port, the deactivation message from the second optical line terminal port is received or carries the message for the optical network unit marks redistributed；According to the deactivation message, carry out offline；Re-start after ranging, receive the second balanced time delay from the second optical line terminal port；Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.
The optical line terminal, is additionally operable to the balanced time delay sent based on second optical line terminal port, obtains the balanced time delay of other optical network units in the multiple optical network unit；The balanced time delay of other optical network units is sent to corresponding other optical network units.
The optical line terminal, it is additionally operable to the balanced time delay sent based on second optical line terminal port, the balanced delay skew of at least one optical network unit is obtained, the balanced time shift skew is sent to other optical network units in the multiple optical network unit.
The method of data communication in a kind of optical network system provided in an embodiment of the present invention, system and optical line terminal, after the communication of local side and multiple optical network units is switched to the second optical line terminal port from the first optical line terminal port, downlink frame is sent at least one optical network unit by second optical line terminal port, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, or, the message for sending the optical network unit marks that deactivation message or transmission carrying are redistributed gives at least one optical network unit, realize that optical network system is not even if supporting the POPUP message can also to carry out distance measuring states again after handover, and then the data communication after fast quick-recovery switching between 0LT and 0NU, avoid the influence to normal traffic communication after switching, reduce handoff delay, improve the satisfaction of user.
As shown in figure 8, the embodiment of the present invention provides a kind of optical line terminal, the optical line terminal includes：
First transmitting element 802, for the communication when the optical line terminal and multiple optical network units from the first optical line terminal port be switched to the second optical line terminal port after, downlink frame is sent at least one optical network unit by second optical line terminal port, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission； First acquisition unit 804, for detect at least one described optical network unit by second optical line terminal port sends comprising the first leading uplink frame；The first leading uplink frame is included based on described, the balanced time delay of at least one optical network unit is obtained；
Second transmitting element 806, for the balanced time delay of at least one optical network unit to be sent at least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
The optical line terminal also includes：
Bandwidth authorizing unit 808, it is connected with first transmitting element, for generating upstream bandwidth authorization messages, the authorization messages include the bandwidth information and lead code Template Information for indicating uplink frame, and lead code Template Information indicates that at least one described optical network unit uses the first leading transmission uplink frame；Upstream bandwidth authorization messages are encapsulated into the downlink frame.
Second acquisition unit 810, for the balanced time delay sent based on second optical line terminal port, obtains the balanced time delay of other optical network units in the multiple optical network unit；
Second transmitting element, is additionally operable to the balanced time delay of other optical network units being sent to corresponding other optical network units.
The optical line terminal also includes：
3rd acquiring unit 812, for the balanced time delay sent based on second optical line terminal port, obtains the balanced delay skew of at least one optical network unit；
Second transmitting element, is additionally operable to sending the balanced time shift skew into other optical network units in the multiple optical network unit.
The embodiment of the present invention also provides a kind of optical network unit, and the optical network unit includes：
First receiving unit 902, for based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；The second optical line terminal port is switched to from the first optical line terminal port, receive the downlink frame from the second optical line terminal port, the downlink frame indicates that uplink frame is leading using first, wherein the described first leading length is more than the second leading length for uplink traffic transmission；
5th transmitting element 904, the first leading uplink frame is included for being sent to the second optical line terminal port；Second receiving unit 906, for receiving the second balanced time delay from the second optical line terminal port；Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.
A kind of optical line terminal provided in an embodiment of the present invention, after the communication of local side and multiple optical network units is switched to the second optical line terminal port from the first optical line terminal port, by second optical line terminal port at least one optical-fiber network Unit sends downlink frame, and the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission；At least one described optical network unit of detection includes the first leading uplink frame by what second optical line terminal port was sent, and the first leading uplink frame is included based on described, obtains the balanced time delay of at least one optical network unit；The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port, realize that optical network system is not even if supporting the POPUP message can also to carry out distance measuring states again after handover, and then the data communication after fast quick-recovery switching between 0LT and 0NU, avoid the influence to normal traffic communication after switching, reduce handoff delay, improve the satisfaction of user, especially for XGP0N systems, the problem of further solving TYPE B masterslave switchovers in XGP0N systems.
As shown in Figure 10, the embodiment of the present invention additionally provides another optical line terminal, and the optical line terminal includes：3rd transmitting element 1002, for the communication when the optical line terminal and multiple optical network units from the first optical line terminal port be switched to the second optical line terminal port after, the message for sending the optical network unit marks that deactivation message or transmission carrying are redistributed by second optical line terminal port gives at least one optical network unit so that at least one described optical network unit is offline；
4th acquiring unit 1004, for carrying out ranging again at least one described optical network unit, obtains the first balanced time delay of at least one optical network unit；
4th transmitting element 1006, for the balanced time delay to be sent at least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
The optical line terminal also includes：
5th acquiring unit 1008, for the balanced time delay sent based on second optical line terminal port, obtains the balanced time delay of other optical network units in the multiple optical network unit；
4th transmitting element, is additionally operable to the balanced time delay of other optical network units being sent to corresponding other optical network units.
24th, optical line terminal according to claim 22, it is characterised in that the optical line terminal also includes：6th acquiring unit 1010, for the balanced time delay sent based on second optical line terminal port, obtains the balanced delay skew of at least one optical network unit；
4th transmitting element, is additionally operable to sending the balanced delay skew into other optical network units in the multiple optical network unit. Another optical line terminal provided in an embodiment of the present invention, after the communication of local side and multiple optical network units is switched to the second optical line terminal port from the first optical line terminal port, the message for sending the optical network unit marks that deactivation message or transmission carrying are redistributed by second optical line terminal port gives at least one optical network unit so that at least one described optical network unit is offline；Again ranging is carried out at least one described optical network unit, the first balanced time delay of at least one optical network unit is obtained；The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port, realize that optical network system is not even if supporting the POPUP message can also to carry out distance measuring states again after handover, and then the data communication after fast quick-recovery switching between 0LT and 0NU, avoid the influence to normal traffic communication after switching, handoff delay is reduced, the satisfaction of user is improved.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can be completed by the related hardware of programmed instruction, foregoing program can be stored in a computer read/write memory medium, the program upon execution, performs the step of including above method embodiment；And foregoing storage medium includes：Awake, awake, magnetic disc or CD etc. are various can be with the medium of store program codes.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although the present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It can still modify to the technical scheme described in foregoing embodiments, or carry out equivalent substitution to which part technical characteristic；And these modifications or replacement, the essence of appropriate technical solution is departed from the scope of various embodiments of the present invention technical scheme.

Claims (1)

  1. Claim
    1st, a kind of communication means of optical network system, the local side of the optical network system provides the first optical line terminal port and the second optical line terminal port, and each optical line terminal port connects multiple optical network units, it is characterised in that including：After the communication of local side and multiple optical network units is switched to the second optical line terminal port from the first optical line terminal port, downlink frame is sent at least one optical network unit by second optical line terminal port, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission；
    At least one described optical network unit of detection includes the first leading uplink frame by what second optical line terminal port was sent, and the first leading uplink frame is included based on described, obtains the balanced time delay of at least one optical network unit；The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
    2nd, according to the method described in claim 1, also include before downlink frame is sent：Upstream bandwidth authorization messages are generated, the authorization messages include the bandwidth information and lead code Template Information for indicating uplink frame, and lead code Template Information indicates that at least one described optical network unit uses the first leading transmission uplink frame；
    Upstream bandwidth authorization messages are encapsulated into the downlink frame.
    3rd, method according to claim 1 or 2, it is characterised in that methods described also includes：
    The balanced time delay sent based on second optical line terminal port, obtains the balanced time delay of other optical network units in the multiple optical network unit；
    The balanced time delay of other optical network units is sent to corresponding other optical network units.
    4th, method according to claim 1 or 2, it is characterised in that methods described also includes：
    The balanced time delay sent based on second optical line terminal port, obtains the balanced delay skew of at least one optical network unit, and the balanced time shift skew is sent to other optical network units in the multiple optical network unit.
    5th, a kind of communication means of optical network system, it is characterised in that methods described includes：
    Based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；
    The second optical line terminal port is switched to from the first optical line terminal port, receive the downlink frame from the second optical line terminal port, the downlink frame indicates that uplink frame is leading using first, wherein the described first leading length is more than the second leading length for uplink traffic transmission；
    Sent to the second optical line terminal port and include the first leading uplink frame；
    Receive the second balanced time delay from the second optical line terminal port； Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.
    6th, a kind of communication means of optical network system, the local side of the optical network system provides the first optical line terminal port and the second optical line terminal port, each optical line terminal port connects multiple optical network units, it is characterised in that methods described includes：
    After the communication of local side and multiple optical network units is switched to the second optical line terminal port from the first optical line terminal port, the message for sending the optical network unit marks that deactivation message or transmission carrying are redistributed by second optical line terminal port gives at least one optical network unit so that at least one described optical network unit is offline；
    Again ranging is carried out at least one described optical network unit, the first balanced time delay of at least one optical network unit is obtained；
    The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
    7th, method according to claim 6, it is characterised in that methods described also includes：
    The balanced time delay sent based on second optical line terminal port, obtains the balanced time delay of other optical network units in the multiple optical network unit；
    The balanced time delay of other optical network units is sent to corresponding other optical network units.
    8th, method according to claim 6, it is characterised in that methods described also includes：
    The balanced time delay sent based on second optical line terminal port, obtains the balanced delay skew of at least one optical network unit, and the balanced time shift skew is sent to other optical network units in the multiple optical network unit.
    9th, a kind of communication means of optical network system, it is characterised in that methods described includes：
    Based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；
    The second optical line terminal port is switched to from the first optical line terminal port, the deactivation message from the second optical line terminal port is received or carries the message for the optical network unit marks redistributed；
    According to the deactivation message, carry out offline；
    Re-start after ranging, receive the second balanced time delay from the second optical line terminal port；
    Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.
    10th, a kind of optical network system, it is characterised in that the system includes：First optical line terminal port and the second optical line terminal port, optical line terminal connect multiple optical network units by each optical line terminal port；
    The optical line terminal, for the communication when optical line terminal and multiple optical network units from the first optical line terminal port be switched to the second optical line terminal port after, by second optical line terminal port at least one optical network unit send Downlink frame, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission；At least one described optical network unit of detection includes the first leading uplink frame by what second optical line terminal port was sent, and the first leading uplink frame is included based on described, obtains the balanced time delay of at least one optical network unit；The balanced time delay is sent to by least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
    At least one described optical network unit, for based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；The second optical line terminal port is switched to from the first optical line terminal port, receive the downlink frame from the second optical line terminal port, the downlink frame indicates that uplink frame is leading using first, wherein the described first leading length is more than the second leading length for uplink traffic transmission；Sent to the second optical line terminal port and include the first leading uplink frame；Receive the second balanced time delay from the second optical line terminal port；Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.
    11st, optical network system according to claim 10, it is characterized in that, the optical line terminal, it is additionally operable to generate upstream bandwidth authorization messages, the authorization messages include the bandwidth information and lead code Template Information for indicating uplink frame, and lead code Template Information indicates that at least one described optical network unit uses the first leading transmission uplink frame；Upstream bandwidth authorization messages are encapsulated into the downlink frame.
    12nd, the optical network system according to claim 10 or 11, it is characterized in that, the optical line terminal, is additionally operable to the balanced time delay sent based on second optical line terminal port, obtains the balanced time delay of other optical network units in the multiple optical network unit；The balanced time delay of other optical network units is sent to corresponding other optical network units.
    13rd, the optical network system according to claim 10 or 11, it is characterized in that, the optical line terminal, it is additionally operable to the balanced time delay sent based on second optical line terminal port, the balanced delay skew of at least one optical network unit is obtained, the balanced time shift skew is sent to other optical network units in the multiple optical network unit.
    14th, a kind of optical network system, it is characterised in that the system includes：First optical line terminal port and the second optical line terminal port, optical line terminal connect multiple optical network units by each optical line terminal port；
    The optical line terminal, for the communication when optical line terminal and multiple optical network units from the first optical line terminal port be switched to the second optical line terminal port after, the message for sending the optical network unit marks that deactivation message or transmission carrying are redistributed by second optical line terminal port gives at least one optical network unit so that at least one described optical network unit is offline；Again ranging is carried out at least one described optical network unit, the first balanced time delay of at least one optical network unit is obtained；The balanced time delay is sent to by least one described optical-fiber network list by second optical line terminal port Member, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port；
    The optical network unit, for based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；The second optical line terminal port is switched to from the first optical line terminal port, the deactivation message from the second optical line terminal port is received or carries the message for the optical network unit marks redistributed；According to the deactivation message, carry out offline；Re-start after ranging, receive the second balanced time delay from the second optical line terminal port；Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.
    15th, optical network system according to claim 14, it is characterized in that, the optical line terminal, is additionally operable to the balanced time delay sent based on second optical line terminal port, obtains the balanced time delay of other optical network units in the multiple optical network unit；The balanced time delay of other optical network units is sent to corresponding other optical network units.
    16th, optical network system according to claim 14, it is characterized in that, the optical line terminal, it is additionally operable to the balanced time delay sent based on second optical line terminal port, the balanced delay skew of at least one optical network unit is obtained, the balanced time shift skew is sent to other optical network units in the multiple optical network unit.
    17th, a kind of optical line terminal, it is characterised in that the optical line terminal includes：
    First transmitting element, for the communication when the optical line terminal and multiple optical network units from the first optical line terminal port be switched to the second optical line terminal port after, downlink frame is sent at least one optical network unit by second optical line terminal port, the downlink frame indicates that at least one described optical network unit uses the first leading transmission uplink frame, wherein the described first leading length is more than the second leading length for uplink traffic transmission；
    First acquisition unit, for detect at least one described optical network unit by second optical line terminal port sends comprising the first leading uplink frame；The first leading uplink frame is included based on described, the balanced time delay of at least one optical network unit is obtained；
    Second transmitting element, for the balanced time delay of at least one optical network unit to be sent at least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with second optical line terminal port.
    18th, optical line terminal according to claim 17, it is characterised in that the optical line terminal also includes：Bandwidth authorizing unit, it is connected with first transmitting element, for generating upstream bandwidth authorization messages, the authorization messages include the bandwidth information and lead code Template Information for indicating uplink frame, and lead code Template Information indicates that at least one described optical network unit uses the first leading transmission uplink frame；Upstream bandwidth authorization messages are encapsulated into the downlink frame.
    19th, the optical line terminal according to claim 17 or 18, it is characterised in that the optical line terminal also includes： Second acquisition unit, for the balanced time delay sent based on second optical line terminal port, obtains the balanced time delay of other optical network units in the multiple optical network unit；
    Second transmitting element, is additionally operable to the balanced time delay of other optical network units being sent to corresponding other optical network units.
    20th, the optical line terminal according to claim 17 or 18, it is characterised in that the optical line terminal also includes：3rd acquiring unit, for the balanced time delay sent based on second optical line terminal port, obtains the balanced delay skew of at least one optical network unit；
    Second transmitting element, is additionally operable to sending the balanced time shift skew into other optical network units in the multiple optical network unit.
    21st, a kind of optical network unit, it is characterised in that the optical network unit includes：
    Receiving unit, for based on the first balanced time delay and the communication of the first optical line terminal port, to carry out business transmission；The second optical line terminal port is switched to from the first optical line terminal port, receive the downlink frame from the second optical line terminal port, the downlink frame indicates that uplink frame is leading using first, wherein the described first leading length is more than the second leading length for uplink traffic transmission；
    5th transmitting element, the first leading uplink frame is included for being sent to the second optical line terminal port；Second receiving unit, for receiving the second balanced time delay from the second optical line terminal port；Communicated based on the described second balanced time delay and the second optical line terminal port to carry out business transmission.
    22nd, a kind of optical line terminal, it is characterised in that the optical line terminal includes：
    3rd transmitting element, for the communication when the optical line terminal and multiple optical network units from the first optical line terminal port be switched to the second optical line terminal port after, the message for sending the optical network unit marks that deactivation message or transmission carrying are redistributed by second optical line terminal port gives at least one optical network unit so that at least one described optical network unit is offline；
    4th acquiring unit, for carrying out ranging again at least one described optical network unit, obtains the first balanced time delay of at least one optical network unit；
    4th transmitting element, for the balanced time delay to be sent at least one described optical network unit by second optical line terminal port, so that at least one described optical network unit is communicated based on the balanced time delay with the second optical line terminal end P.
    23rd, optical line terminal according to claim 22, it is characterised in that the optical line terminal also includes：5th acquiring unit, for the balanced time delay sent based on second optical line terminal port, obtains the multiple light The balanced time delay of other optical network units in NE；
    4th transmitting element, is additionally operable to the balanced time delay of other optical network units being sent to corresponding other optical network units.
    24th, optical line terminal according to claim 22, it is characterised in that the optical line terminal also includes：6th acquiring unit, for the balanced time delay sent based on second optical line terminal port, obtains the balanced delay skew of at least one optical network unit；
    4th transmitting element, is additionally operable to sending the balanced delay skew into other optical network units in the multiple optical network unit.
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