CN1897591A - Multipoint-controlled protocol discovery processing method and related Ethernet passive light network - Google Patents
Multipoint-controlled protocol discovery processing method and related Ethernet passive light network Download PDFInfo
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Abstract
The method comprises: optical line terminal (OLT) sends a strobe finding message to the optical network unit (ONU); the ONU sends a registration request message to the OLT; after receiving the registration request, the OLT sends the registration message to the ONU and starts up the timer; after the timer is time out, the OLT immediately sends the standard strobe message to the ONU to allocate the bandwidth authorizing window for the registration confirmation message; if the OLT doesn't receive the registration message in the authorizing window, then deleting the registration for the ONU and restarting the finding and processing procedure; if the OLT receives the registration confirmation message in the authorizing widow, then the finding and processing procedure of the ONU is implemented.
Description
Technical field
The present invention relates to band optical fiber and insert the field, especially, the present invention relates to be applied to the method that the discovery in the improved Multi-point Control Protocol of Ethernet passive optical network is handled.In addition, the invention still further relates to relevant Ethernet passive optical network.
Background technology
Go into bandwidth with new business such as IPTV, new interface applications and have higher requirement along with developing rapidly of internet, optical fiber inserts the inevitable direction that becomes the broadband access network development.Consider that from the maturity and the operation cost of technology Ethernet passive optical network (EPON) is the main realization means that optical fiber inserts, and also is the most potential access technology.
Because the EPON system adopts the topological structure of the point of bandwidth sharing to multiple spot, each optical line terminal (OLT) connects a plurality of optical network units (ONU) by Optical Distribution Network (ODN), thereby broadcast transmission on down direction, on the up direction from the optical network unit to the optical line terminal, adopt time division multiple access to insert the mode of (TDMA), come coordination data effectively to send and reception with Multi-point Control Protocol (MPCP) agreement, it is professional to guarantee only to allow at any time on the up direction in system's running an ONU to send.5 Multi-point Control Protocol data cells (MPCPDU) in the MPCP agreement, have been defined: gating (GATE), register requirement (REGISTER_REQ), registration (REGISTER), accreditation verification (REGISTER_ACK) and report automatic discovery that (REPORT) is used for realizing ONU and functions such as adding, bandwidth request, bandwidth authorizing, range finding.Related to the present invention mainly is preceding four kinds of data cells, i.e. gating (GATE), register requirement (REGISTER_REQ), registration (REGISTER), accreditation verification (REGISTER_ACK).The MPCP functional module comprises three big functions: find to handle (Discovery Processing), report processing (Report Processing) and gating and handle (Gate Processing).The present invention mainly is the improvement to the discovery processing method in the MPCP agreement.
The EPON system is by finding that handling process will newly connect or non-online ONU is linked in the network.The process roughly of this discovery handling process is as follows in the prior art: Fig. 1 has provided the handshake procedure of the discovery processing that defines in the IEEE 802.3ah standard.As shown in Figure 1, this flow process is initiated by OLT, periodically produces legal discovery time window, makes OLT have an opportunity to detect non-online ONU.OLT notifies the cycle of ONU discovery time window by broadcasting discovery gating (DiscoveryGATE) message, finds that gating message comprises time started and the length of finding window.Shown in the uppermost arrow of Fig. 1, the destination-address of gating message (DA) is MAC control multicast address (" 0x0180C2000001 "), and source address (sa) is the OLT MAC Address, and content is mandate+lock in time (synctime); Non-online ONU receives the beginning that will wait for this authorized window after this message, send register requirement (REGISTER_REQ) message to OLT then, shown in top-down second arrow of Fig. 1, the destination-address of login request message is a MAC control multicast address, source address is the ONU MAC Address, and content is the number of maximum wait mandate (Pending Grant); After OLT receives effective login request message, to register this ONU, distribute and specify the LLID (LLID) of new port, and with corresponding M AC and LLID binding, shown in top-down the 3rd arrow of Fig. 1, next step of discovery process is that OLT sends registration (REGISTER) message to newfound ONU, this message comprises the LLID of ONU and the lock in time that OLT requires, destination-address is the ONU MAC Address, source address is the OLT MAC Address, content is the response of LLID+ lock in time+maximum wait authorization number, and simultaneously, the number that OLT also tackles the mandate of ONU maximum wait responds; This moment, OLT had enough information to be used to dispatch ONU visit PON, and send the gating message (NormalGATE) of standard to ONU, as Fig. 1 from top to bottom shown in the 4th arrow, this message is used for sending bandwidth authorizing to ONU and sends accreditation verification (REGISTER_ACK) message to allow this ONU, this message destination-address is a MAC control multicast address, source address is the OLT MAC Address, and content is for authorizing; ONU mandate according to this message after receiving this message sends accreditation verification to OLT, as Fig. 1 from top to bottom shown in the 5th arrow, destination-address is a MAC control multicast address, source address is the ONU MAC Address, content is the response of response+lock in time of LLID, when OLT receives accreditation verification, the discovery flow process of this ONU is finished, and ONU succeeds in registration and can begin to send normal business.In above-mentioned process, top-down first three arrow is that latter two arrow is the mode by clean culture by the mode of broadcasting.
In finding the flow process of handling, send registration confirmation message in the bandwidth authorizing time (being authorized window) that ONU must give in the gating message of standard, otherwise OLT can think that this ONU does not finish registration process, and OLT can require ONU to re-execute the discovery process and re-register.Because ONU needs the regular hour to handle registration message, and in the standard of IEEE802.3ah, clearly do not stipulate the size of this time, therefore, if the processing time of ONU long (above tens milliseconds), ONU can't send accreditation verification in the bandwidth authorizing window of standard GATE message.Between the 3rd, 4 arrow from top to bottom of Fig. 1, be that OLT might be very short to the interval that ONU sends between the gating message to ONU transmission registration message and OLT, ONU has been known this bandwidth authorizing window, but also do not handle registration, may in authorized window, not send out over registration confirmation message.And wait until when ONU is ready to send registration confirmation message, the bandwidth authorizing window that does not but have OLT, need restart registration process, and restart after the registration is that OLT sends registration message to ONU, and OLT sends gating message to ONU then, and OLT may be very short to ONU transmission registration message and OLT to the interval that ONU sends between the gating message, if the time of the processing of ONU registration still is long, then this ONU still can't register smoothly, and so forth, has also wasted the bandwidth of system.So must improve the discovery processing procedure of MPCP, guarantee that the slow ONU of processing speed under normal circumstances can successfully succeed in registration.
Summary of the invention
One of purpose of the present invention provides a kind of technology, and it can alleviate the problem of crossing the registration process failure that causes slowly in the prior art owing to the processing speed of optical network unit.
The present invention be guarantee to handle slow ONU by a timer mechanism can be normally, registration effectively.
The method of one of solution of the present invention for providing a kind of multipoint-controlled protocol discovery to handle comprises:
Optical line terminal periodically produces the discovery time window, and notifies the cycle of optical network unit discovery time window by broadcasting discovery gating message;
Optical network unit receives to be found to wait for that the cycle of discovery time window begins the back to optical line terminal transmission login request message after the gating message;
Optical line terminal sends registration message to optical network unit after receiving login request message, and starts timer simultaneously;
Optical line terminal sends standard strobe message to optical network unit immediately behind timer expiry, and this gating message is used for registration confirmation message and distributes bandwidth authorizing window;
If optical line terminal is received the registration confirmation message of this ONU in authorized window, find that then processing procedure finishes.
If optical line terminal is not received registration confirmation message in authorized window, then separate this optical network unit of registration (Deregister), and come back to discovery and the registration process of ONU.
Wherein the timing of timer is configurable, and span can be 2ms-50ms.
Wherein the timing of timer can be handled the statistical probability of the time of registration message usually according to optical network unit and determines.
Timer can be arranged to a constant timing.But, the sequence that the timing of timer also can be configured to increase progressively, timing value in this sequence is arranged from small to large, timer is arranged to minimum timing at the beginning, if not receiving the registration confirmation message of this ONU in authorized window, optical line terminal comes back to after the discovery processing procedure, timer can be arranged to secondly little timing, the rest may be inferred then, and last timer is configured to maximum timing if optical line terminal is never received registration confirmation message in authorized window.
The present invention also provides a kind of Ethernet passive optical network, comprises optical line terminal and the optical network unit that is coupled to optical line terminal.Wherein the optical line terminal function comprises: periodically produce the discovery time window and notify the modulus of periodicity piece of optical network unit discovery time window by broadcasting discovery gating message; Timer; Send the module that registration message also starts timer simultaneously to optical network unit after receiving login request message; Thereby behind timer expiry, send standard strobe message is distributed bandwidth authorizing window to registration confirmation message module to optical network unit immediately; If in authorized window, do not receive registration confirmation message, then separate this optical network unit of registration, and restart the discovery processing procedure of ONU, and if in authorized window, receive registration confirmation message, then think and find the module of finishing dealing with; Wherein optical network unit comprises: receive and find to wait for that the cycle of discovery time window begins the back sends module from login request message to optical line terminal after the gating message; Send the module of registration confirmation message to optical line terminal.
One of effect of the present invention is to adopt timer mechanism, postponed the time of optical line terminal transmission registration confirmation message bandwidth authorizing window, as shown in Figure 2, at from top to bottom the 3rd of Fig. 2, between 4 arrows is a timing that is provided with by timer at interval, it can guarantee the ONU processing registration message that can have ample time, like this, ONU learns after the registration confirmation message bandwidth authorizing window, just can have ample time and in this authorized window, registration confirmation message be sent out over, and in Fig. 1 in the prior art, from top to bottom the 3rd of Fig. 1, between 4 arrows is changeable at interval, uncontrollable, when this interval is very short, may be no matter through how many times registration repeatedly, ONU still can't register in authorized window.The present invention has guaranteed to handle slow ONU by timer mechanism can be normally, registration effectively, improved stability, reliability and the interoperability of EPON system, applied widely, realize simple, flexible, be applicable to the ONU equipment of different EPON systems, have good interoperability.
Description of drawings
Fig. 1 is the method flow diagram that the discovery in the Multi-point Control Protocol of prior art is handled, and it has provided the handshake procedure that the discovery that defines in the IEEE 802.3ah standard is handled.
Fig. 2 is the method flow diagram that the discovery in the Multi-point Control Protocol of the present invention is handled.
Fig. 3 is that the MPCP that the present invention is based on timer mechanism finds the final login state figure of OLT in the handling process.
Fig. 4 is the structured flowchart of Ethernet passive optical network of the present invention.
Embodiment
Fig. 2 is the method flow diagram that the discovery in the Multi-point Control Protocol of the present invention is handled.The present invention is provided with timer on OLT.As shown in Figure 2, optical line terminal periodically produces the discovery time window, and notifies the cycle of optical network unit discovery time window by broadcasting discovery gating (Discovery GATE) message, finds that gating message comprises time started and the length of finding window.Shown in top-down first arrow of Fig. 2, its destination-address is a MAC control multicast address, and source address is the OLT MAC Address, and content is mandate+lock in time (synctime); Optical network unit receives to be found to wait for that the cycle of discovery time window begins the back to optical line terminal transmission register requirement (REGISTER_REQ) message after the gating message, shown in top-down second arrow of Fig. 2, its destination-address is a MAC control multicast address, source address is the OLT MAC Address, content is the number of maximum wait mandate (Pending Grant), and preceding two arrows of said process and Fig. 1 are like the comparing class.Then, optical line terminal sends registration (REGISTER) message to optical network unit after receiving login request message, and start timer simultaneously, shown in top-down the 3rd arrow of Fig. 2, the destination-address of this registration message is the ONU MAC Address, source address is the OLT MAC Address, content be the lock in time+to the response of maximum wait authorization number; Optical line terminal sends standard strobe (Normal GATE) message to optical network unit immediately behind timer expiry, distribute bandwidth authorizing window to registration confirmation message, shown in top-down the 4th arrow of Fig. 2, the destination-address of this gating message is a MAC control multicast address, source address is the OLT MAC Address, and content is for authorizing; ONU sends accreditation verification (REGISTER_ACK) message to OLT then, shown in top-down the 5th arrow of Fig. 2, the destination-address of this accreditation verification is a MAC control multicast address, source address is the ONU MAC Address, content is the response of response+lock in time of LLID, because this process is inevitable, lie in the following process of receiving registration confirmation message, so this process is seldom given unnecessary details.If optical line terminal is not received registration confirmation message in authorized window, then separate this optical network unit of registration, and restart to find processing procedure, send to optical network unit and find gating (Discovery GATE) message, repeat said process then; If optical line terminal is received registration confirmation message in authorized window, then the discovery of optical network unit is finished dealing with.In Fig. 2, to be undertaken by broadcasting by the process that top-down first three arrow of Fig. 2 is represented, latter two process is undertaken by clean culture.
Adopted timer mechanism among Fig. 2, postponed the time of optical line terminal transmission registration confirmation message bandwidth authorizing window, at from top to bottom the 3rd of Fig. 2, between 4 arrows is a timing that is provided with by timer at interval, it can guarantee the ONU processing registration message that can have ample time, like this, ONU learns after the registration confirmation message bandwidth authorizing window, just can have ample time and in this authorized window, registration confirmation message be sent out over, and in Fig. 1 in the prior art, from top to bottom the 3rd of Fig. 1, between 4 arrows is changeable at interval, uncontrollable, when this interval is short, may be no matter through how many times registration repeatedly, ONU still can't register in authorized window.The present invention has guaranteed to handle slow ONU by the process among Fig. 2 can be normally, registration effectively.
The timing of the timer among the present invention is configurable, determine such as handling the statistical probability of the time of registration message usually according to optical network unit, such as according to probabilistic method, optical network unit being handled usually the time of registration message samples, be provided with regularly according to the timing that can be registered to authorized window such as 95% optical network unit then, this can be determined according to statistical method by those skilled in the art.In general, the timing of timer can be set to 2ms-50ms.This can be a constant value regularly, certainly it also can change, such as a sequence that is configured to increase progressively, timing value in this sequence is arranged from small to large, timer is arranged to minimum timing at the beginning, if not receiving registration confirmation message in authorized window, optical line terminal comes back to after the discovery processing procedure, timer can be arranged to secondly little timing, the rest may be inferred then (because ONU can be by its MAC Address sign, so OLT can write down the timing of once attempting in the specific ONU registration process), last timer is configured to maximum timing if optical line terminal is never received registration confirmation message in authorized window.The benefit of doing like this is not waste system resource as much as possible, because most optical network unit can be registered to authorized window when that minimum timing value is set, have only extremely other to register into, therefore this regularly can be amplified gradually, up to this upper limit regularly.If to maximum timing value still can't register into, illustrate that the processing speed of this ONU is too slow, then this ONU can't finish the discovery processing procedure, thereby can't use.
Fig. 3 is that the MPCP that the present invention is based on timer mechanism finds the final login state figure of OLT in the handling process.It topmost is beginning, OLT waits for that gating is (after OLT has sent registration message then, wait timer expiry always, send gating then, jump to queued for log-on when confirming state at OLT from the waiting system state, increased a jump condition " Register_Gate_Timer_Done ", the expression timer is overtime.That is to say, when timer is overtime, OLT just sends gating, sends gating and just means the queued for log-on affirmation, works as localTime=grantEndTime, when promptly in authorized window, not receiving accreditation verification, OLT separates this ONU of registration, therefore jumps to and separates login state, gets back to the wait strobe state then again, if in authorized window, received accreditation verification, then finish the registration of MPCP.
Fig. 4 is the structured flowchart of Ethernet passive optical network of the present invention.Ethernet passive optical network (4) comprises optical line terminal (41) and is coupled to the optical network unit (42) of optical line terminal (41).
Optical line terminal (41) comprising: periodically produce the discovery time window and notify the modulus of periodicity piece (411) of optical network unit discovery time window by broadcasting discovery gating message; Timer (412); Send the module (413) that registration message also starts timer simultaneously to optical network unit after receiving login request message; Thereby behind timer expiry, send standard strobe message is distributed bandwidth authorizing window to registration confirmation message module (414) to optical network unit immediately; If in authorized window, do not receive registration confirmation message, then separate this optical network unit of registration, and come back to registration process, and if in authorized window, receive registration confirmation message, then think and find the module (415) of finishing dealing with.
Optical network unit (42) comprising: receive and find to wait for that the cycle of discovery time window begins the back sends module (421) from login request message to optical line terminal after the gating message; Send the module (422) of registration confirmation message to optical line terminal.
The control signal that arrow in Fig. 4 is illustrated in the method that multipoint-controlled protocol discovery of the present invention handles flows to.Because explain in front, repeat no more here.
Above-mentioned each module is corresponding with each step of the inventive method, the function of each module corresponding respectively the step of method of the present invention, therefore, those skilled in the art can realize these modules according to these functions or with the corresponding method step of these functions by programming at an easy rate, thereby set up described Ethernet passive optical network.
Should be appreciated that those skilled in the art can make various modifications and distortion to above embodiment under the prerequisite of the spirit and scope that do not deviate from claim of the present invention, they all drop within protection scope of the present invention.
Claims (6)
1. the method handled of a multipoint-controlled protocol discovery comprises:
Optical line terminal periodically produces the discovery time window, and notifies the cycle of optical network unit discovery time window by broadcasting discovery gating message;
Optical network unit receives to be found to wait for that the cycle of discovery time window begins the back to optical line terminal transmission login request message after the gating message;
Optical line terminal sends registration message to optical network unit after receiving login request message, and starts timer simultaneously;
Optical line terminal sends standard strobe message to optical network unit immediately behind timer expiry, distributes bandwidth authorizing window to registration confirmation message;
If optical line terminal is not received registration confirmation message in authorized window, then separate this optical network unit of registration, and restart to find processing procedure, send to optical network unit and find gating message to repeat above-mentioned steps; If optical line terminal is received registration confirmation message in authorized window, then the discovery of optical network unit is finished dealing with.
2. according to the process of claim 1 wherein that the timing of timer is configurable.
3. according to the method for claim 2, wherein the timing of the timer statistical probability of handling the time of registration message usually according to optical network unit is determined.
4. according to the method for claim 3, wherein the timing of timer is 2ms-50ms.
5. according to the method for claim 2, wherein the timing configured of timer becomes a sequence increasing progressively, timing value in this sequence is arranged from small to large, timer is arranged to minimum timing at the beginning, if optical line terminal is not received registration confirmation message and is come back to after the registration process in authorized window, timer can be arranged to secondly little timing, the rest may be inferred then, and optical line terminal can write down the timing value that uses in the repeatedly registration process of particular optical network unit by the Media Access Control address of optical network unit; Last timer is configured to maximum timing if optical line terminal is never received registration confirmation message in authorized window.
6. an Ethernet passive optical network (4) comprises optical line terminal (41) and is coupled to the optical network unit (42) of optical line terminal (41),
Wherein optical line terminal (41) comprising: periodically produce the discovery time window and notify the modulus of periodicity piece (411) of optical network unit discovery time window by broadcasting discovery gating message; Timer (412); Send the module (413) that registration message also starts timer simultaneously to optical network unit after receiving login request message; Thereby behind timer expiry, send standard strobe message is distributed bandwidth authorizing window to registration confirmation message module (414) to optical network unit immediately; If in authorized window, do not receive registration confirmation message, then separate this optical network unit of registration, and come back to registration process, and if in authorized window, receive registration confirmation message, then think and find the module (415) of finishing dealing with;
Wherein optical network unit (42) comprising: receive and find to wait for that the cycle of discovery time window begins the back sends module (421) from login request message to optical line terminal after the gating message; Send the module (422) of registration confirmation message to optical line terminal.
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| WO2008095363A1 (en) * | 2007-02-07 | 2008-08-14 | Hangzhou H3C Technologies Co., Ltd. | A method for transmitting data in coax network and the transmission device thereof |
| CN101471836B (en) * | 2007-12-26 | 2010-11-10 | 普然通讯技术(上海)有限公司 | Registration method of slave equipment to main equipment of packet-switching network |
| CN101917228A (en) * | 2010-07-30 | 2010-12-15 | 武汉烽火网络有限责任公司 | Method for realizing wired private network of group users |
| CN101170468B (en) * | 2007-11-22 | 2011-06-01 | 中国电信股份有限公司 | Acquisition method and system for optical network unit capability information |
| CN102594585A (en) * | 2011-12-15 | 2012-07-18 | 江苏亿通高科技股份有限公司 | Automatic clearing method for terminal registry |
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| WO2008095363A1 (en) * | 2007-02-07 | 2008-08-14 | Hangzhou H3C Technologies Co., Ltd. | A method for transmitting data in coax network and the transmission device thereof |
| US8149861B2 (en) | 2007-02-07 | 2012-04-03 | Hangzhou H3C Technologies Co., Ltd. | Method and transmission apparatus for transmitting data in a coax network |
| CN101170468B (en) * | 2007-11-22 | 2011-06-01 | 中国电信股份有限公司 | Acquisition method and system for optical network unit capability information |
| CN101471836B (en) * | 2007-12-26 | 2010-11-10 | 普然通讯技术(上海)有限公司 | Registration method of slave equipment to main equipment of packet-switching network |
| CN101729944B (en) * | 2008-10-24 | 2013-07-17 | 株式会社日立制作所 | Optical access system and optical line terminal |
| CN101765033B (en) * | 2009-12-23 | 2012-12-19 | 上海全景数字技术有限公司 | Dynamic time slot allocating method applied to coaxial load-bearing Ethernet equipment |
| CN101917228A (en) * | 2010-07-30 | 2010-12-15 | 武汉烽火网络有限责任公司 | Method for realizing wired private network of group users |
| TWI462513B (en) * | 2011-02-08 | 2014-11-21 | Mitsubishi Electric Corp | Time synchronization method for communication system, slave station apparatus, host station apparatus, control apparatus and program |
| CN102594585A (en) * | 2011-12-15 | 2012-07-18 | 江苏亿通高科技股份有限公司 | Automatic clearing method for terminal registry |
| CN102594585B (en) * | 2011-12-15 | 2014-06-25 | 江苏亿通高科技股份有限公司 | Automatic clearing method for terminal registry |
| WO2013107335A1 (en) * | 2012-01-18 | 2013-07-25 | 中兴通讯股份有限公司 | Optical network unit and registration method and system thereof |
| CN105659512A (en) * | 2013-10-25 | 2016-06-08 | 日本电信电话株式会社 | Optical communication system and optical communication abnormality-recovery method |
| US9780867B2 (en) | 2013-10-25 | 2017-10-03 | Nippon Telegraph And Telephone Corporation | Optical communication system and optical communication abnormality-recovery method |
| CN105659512B (en) * | 2013-10-25 | 2018-01-02 | 日本电信电话株式会社 | Optical communication system and optic communication abnormal restoring method |
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