CN1484933A - Point-to-multipoint passive optical network that utilizes variable-length packets and variable-length upsteam tine slots - Google Patents
Point-to-multipoint passive optical network that utilizes variable-length packets and variable-length upsteam tine slots Download PDFInfo
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Abstract
A point-to-multipoint passive optical network transmits downstream data from an optical line terminal (OLT) to multiple optical network units (ONUs) in variable-length packets and upstream data from the ONUs to the OLT in variable-length packets utilizing time division multiplexing with variable-length time slots to avoid transmission collisions. In an embodiment, the system further includes a time slot controller in communication with the OLT and the ONUs for changing the length of the ONU-specific variable-length time slots in response to upstream traffic demand from the ONUs. In a further embodiment, the time slot controller includes logic for increasing the length of a first ONU-specific time slot in response to an increase in upstream traffic demand from a first ONU, the first ONU being one of the ONUs. In a further embodiment, the time slot controller includes logic for decreasing the length of a second ONU-specific time slot in response to the increase in the length of the first ONU-specific time slot. In an embodiment, the variable-length downstream packets and the variable-length upstream packets are formatted according to IEEE 802.3.
Description
Invention field
The present invention is in general about the broadband light communication network, more particularly says so about single-point to the EPON of multiple spot.
Background of invention
Flourish along with the Internet, and, produced a kind of demand for the end user provides the various communication and the requirement of entertainment service, promptly need a kind of broadband network architecture that promotes visit to end user.There is a kind of broadband network architecture of visit to end user that promotes to be called the passive optical network (PON) of single-point to multiple spot.Single-point is the network architecture of an optical communication to the PON of multiple spot, and on a pure passive optical distribution network, it has promoted the broadband communications between an optical line terminal (OLT) and a plurality of distal end optical network units (ONUs).Single-point utilizes passive fiber deconcentrator and coupler to come no seedbed distribution light signal between OLT and far-end ONU to the PON of multiple spot.
Figure 1A and 1B have shown at downstream and the upstream of a single-point to the network traffics between OLT102 among the PON of multiple spot and 3 ONUs104.Though only described 3 ONUs, can comprise not only 3 ONUs in to the PON of multiple spot at a single-point.As Figure 1A, downstream comprises the distinctive block of information of the ONU that is sent by OLT.Downstream is divided into three other signals of branch by a passive light deconcentrator light, and each all has the peculiar block of information of complete ONU.Each ONU reads the block of information that belongs to this ONU, and abandons belonging to the block of information of other ONU.For example, OUN-1 has received block of information 1,2,3, yet it has just passed to end user 1 with block of information 1.Same, OUN-2 has passed to end user 2 with block of information 2, and OUN-3 has passed to end user 3 with block of information 3.Shown in Figure 1B, uplink traffic uses the time division multiplexing technology to manage, and transmission time slot is assigned to ONU specially therein.These time slots are synchronous, in case because will guarantee message blocks is connected on the public optical fiber 110, be commonly referred to as trunk line, the upstream message piece that comes from ONU can not interfere with each other.For example, ONU-1 is at first time slot transmission information piece 1, and ONU-2 is at second non-overlapped time slot transmission information piece 2, and ONU-3 is the 3rd non-overlapped slot transmission message blocks 3.Shown in Figure 1B, all block of information is transmitted on trunk line in non-overlapped time slot.
Because being used to send to the PON of multiple spot, single-point combines sound, the service of data and video, existing single-point designs around the ATM Data Transport Protocol the PON of multiple spot, this agreement is designed to have following service quality (QoS) characteristics, promptly make sound, data and video comprehensively can pass through a single communication channel transmission.Known in parcel exchange communication field as everybody, the ATM agreement uses 53 byte units of regular length to come transmission information (extentions of the pay(useful) load of 48 bytes and 5 bytes).In the PON of single-point to multiple spot on an ATM-basis, the atm cell of regular length is used to upload transmission information at the uplink and downlink both direction.Give an example,, in each time slot of uplink traffic, all be filled with the atm cell of a regular length and the flow control zone of a regular length as what in No. the 5978374th, United States Patent (USP), revealed.
Though the ATM agreement has been used the 53-byte units of regular length, atm network often need transmit the flow that is extensive use of Internet agreement (IP) form.Internet protocol requirement data are split into the packet of variable-length, and maximum can reach 65535 bytes.PON to multiple spot is fit to transmit the IP flow for the single-point that makes an ATM-basis, and the IP packet must be divided into the fragment of 48 bytes, and must add the header of one 5 byte.The IP packet of all introducings is divided into 48 byte section, and adds the work of the header of one 5 byte, produced a large amount of extentions, it has consumed a single-point to the available bandwidth among the PON of multiple spot.Except the bandwidth that atm header has consumed that increases, the processing procedure that the IP packet is converted to atm cell can consume the plenty of time, and its special hardware has increased the cost of OLT and ONUs.
Single-point of another composition is IEEE802.3 agreement (being commonly called Ethernet) to the Data Transport Protocol of the PON of multiple spot.Ethernet passes through variable-length, and the package that maximum can reach 1518 bytes transmits effective load data (for example IP packet).Though the Ethernet protocol data unit is called as " package ", protocol data unit is also referred to as " frame " usually.In the PON of single-point to multiple spot, the package that uses variable-length, maximum can reach 1518 bytes has significantly reduced the extention of IP flow, with respect to the single-point on an ATM basis for the extention among the PON of multiple spot.Except reducing the advantage of extention, the ethernet network assembly is also relatively more cheap comparatively speaking.
When a plurality of websites on an ethernet network are shared a public physical transfer path, Ethernet protocol uses the Carrier Sense Multiple Access agreement (CSMA/CD) of band collision detection as a media access control (MAC) method applicable, to avoid in the conflict that is transmitted between the flow.CSMA/CD is a medium access control protocol efficiently, and it does not need a plurality of websites to keep synchronously.On an ethernet network, use CSMMCD and require the minimum length of a package must be, so that avoid occurring that all websites all can't detectedly conflict on the network greater than the maximum round trip propagation time on the network.That is to say that on the ethernet network of a multi-site, the largest interval distance between the user is subjected to the restriction of conflict range.Give an example, on an ethernet network with the 1Gb/s operation, the largest interval distance between the website is limited in about about 200 meters by CSMA/CD.For single-point is operated commercial the PON of multiple spot, OLT and ONU need to be separated to the farther distance of ultimate range that allows than CSMA/CD.Except the restriction of conflict range, the ethernet network that relies on CSMA/CD still is uncertain.That is to say that QoS can not give security for the flow between OLT and ONU.
The single-point of considering the ATM-basis to the PON of multiple spot and the single-point of Basic Ethernet that uses CSMA/CD to the limitation of the PON of multiple spot, what need is a use variable-length package, and can be increased in the PON of the single-point of the maximum admissible spacing distance between OLT and the ONU to multiple spot.
Brief summary of the invention
Single-point is to the system and method for multi-point communication, it relates to a PON, descending therein signal data are used the variable-length package and are transferred to a plurality of ONU from an OLT, and up signal data wherein are used the variable-length package and are transferred to OLT from ONU, and this package has utilized the variable-length time slot of time division multiplexing to disturb to avoid transmission.Utilize the variable-length package to replace the regular length atm cell to transmit data, IP data have for example reduced the transmission extention with respect to the single-point on an ATM-basis to multiple spot PON.Utilize time division multiplexing to avoid the transmission of up signal to disturb, eliminated and used the distance limit of CSMA/CD as the shared-media network of medium access control protocol, and the variable-length time slot is used for transmitting uplink data, allow between ONU, to distribute flexibly available uplink bandwidth.
Single-point is to the embodiment of multiple spot light communication system, comprise an OLT, and a large amount of pass through an EPON and be connected to ONU on this OLT, downlink data is transferred to ONU from OLT on PON in this network, and upstream data is transferred to OLT from ONU on PON.OLT uses the descending package transmission downlink data of variable-length on EPON.ONU is by using ONU distinctive on EPON, utilizes the variable-length slot transmission upstream data of time division multiplexing.Filled by the up signal package of a plurality of variable-lengths in the time slot of the distinctive variable-length of ONU therein.
An embodiment of this system has further comprised a time slot controller, is used to change the length of the distinctive variable-length time slot of ONU in the communication with OLT and ONU, to adapt to the uplink traffic demand from ONU.Time slot controller comprises logicality, is used to increase the length of one the one peculiar time slot of ONU further among the embodiment at one, and to adapt to the increase of the uplink traffic that is determined by one the one ONU, this OUN is among the ONU.Time slot controller comprises logicality, is used to reduce the length of one the 2nd peculiar time slot of ONU further among the embodiment at one, with the increase of the length that adapts to the peculiar time slot of an ONU.
In one embodiment, system comprises a time division multiplexing (TDM) controller in OLT inside, be used to generate special frames, and it is by the descending synchronism that sends ONU with the assurance transmitting uplink data to.In a further embodiment, time slot controller generates the time slot table corresponding to the traffic demand data, and the special frames that the ONU response receives is brought into use a new time slot table.
In one embodiment, the descending package of variable-length is formatd according to IEEE802.3.In one embodiment, comprised the IP packet in the descending package of variable-length, and in another embodiment, the length of the descending package of variable-length is relevant with the IP length of data package.In another embodiment, the up package of variable-length is formatd according to IEEE802.3.In one embodiment, comprised the IP packet in the up package of variable-length, and in another embodiment, the length of the up package of variable-length is relevant with the IP length of data package.
A single-point to multiple spot PON on, the method for exchange message between an OLT and a plurality of ONU comprises by the descending package of variable-length from the OLT transmitting downlink data to ONU.And distinctive by ONU, use time division multiplexing to avoid transmitting the variable-length time slot of interference, from the ONU transmit ascending data to OLT.Therein, the distinctive variable-length time slot of ONU is filled by the up package of variable-length.
An embodiment of this method has further comprised a step, in order to a length that changes the distinctive variable-length time slot of above-mentioned ONU, to adapt to the uplink traffic that is determined by above-mentioned ONU.A further embodiment of this method comprises a step, promptly increases the length of one the one distinctive time slot of ONU, and to adapt to the increase of the uplink traffic that is determined by one the one ONU, this ONU is among the above-mentioned ONU.A further embodiment of this method has comprised a step, promptly reduces the length of one the 2nd distinctive time slot of ONU, with the increase of the length that adapts to the peculiar time slot of an ONU.
Another embodiment of this method comprises a step, promptly reduces the length of one the one peculiar time slot of ONU, and to adapt to the minimizing of the uplink traffic that is determined by one the one ONU, this ONU is among a plurality of ONU.
In one embodiment, variable-length uplink and downlink package quilt is according to the IEEE802.3 formatted.In one embodiment, comprise a header and a pay(useful) load in the descending and up package of variable-length, and the same IP length of data package of the length of variable-length package is relevant, this packet is comprised in the pay(useful) load of variable-length package.
In one embodiment, the downstream IP packet is embedded in the descending package of variable-length and up IP packet is embedded in the up package of variable-length.In one embodiment, variable-length uplink and downlink package quilt is according to the IEEE802.3 formatted.
In one embodiment, be included in regular time interior at interval transmission down-going synchronous mark in the step of transmitting downlink data.
In one embodiment, the distinctive variable-length time slot of ONU is filled by a plurality of variable-length packages.
Other aspects of the present invention and advantage will be revealed in the following detailed description, the accompanying drawing of contact back, and Shuo Ming method illustrates principle of the present invention by way of example.
Brief description of drawings
Figure 1A has described on the PON of single-point to multiple spot, the descending signal stream of the flow from an OLT to a plurality of ONU.
Figure 1B has described on the PON of single-point to multiple spot, from the up signal stream of the flow of a plurality of ONU to OLT.
Fig. 2 has described the PON that the single-point of a tree topology is arranged multiple spot.
Fig. 3 has described according to one embodiment of the present of invention, a theory diagram of an OLT downlink transfer variable-length package.
Fig. 4 has described the example of a downlink traffic, and it is used the variable-length package and is transferred to a plurality of ONU from an OLT, according to one embodiment of the present of invention.
Fig. 5 has described according to one embodiment of the present of invention, and an ONU uses time division multiplexing to come a theory diagram of the package of uplink variable-length.
Fig. 6 has described the example of a uplink traffic according to one embodiment of the present of invention, and it has comprised the variable-length package of being handled by time division multiplexing, in order to avoid interference.
Fig. 7 A-7C has described according to one embodiment of the present of invention, the example of the time slot allocation of 3 different uplink traffics.
Fig. 8 is the process chart according to a time slot control technology of one embodiment of the present of invention.
Fig. 9 has described the special frames of basis corresponding to the process chart of Fig. 8, and uplink frame, and time slot are selected the timing of uplink traffic.
Figure 10 is a process chart, has described according to one embodiment of the present of invention, is used for a method of exchange message between OLT and a plurality of ONU.
The detailed description of invention
One about the single-point of the PON system and method to multi-point communication, downlink data is in the package of variable-length therein, be transferred to a plurality of ONU from an OLT, and therein upstream data in the package of variable-length, utilized the variable-length time slot that uses time division multiplexing to disturb, be transferred to OLT from ONU to avoid transmission.In one embodiment, system has further comprised a time slot controller, with the communication of OLT and ONU in, be used to change the length of the distinctive variable-length time slot of ONU, to adapt to uplink traffic demand from ONU.In a further embodiment, time slot controller comprises logicality, is used to increase the length of one the one peculiar time slot of ONU, to adapt to the increase of the uplink traffic that is determined by one the one ONU.At one further among the embodiment, time slot controller comprises logicality, is used to reduce the length of one the 2nd peculiar time slot of ONU, increases with the length that adapts to the peculiar time slot of an ONU.
Fig. 2 has described the example of a single-point to multiple spot PON 200.This single-point comprises an OLT202 and a plurality of ONU204 to multiple spot PON, and they are connected by a passive light distribution network.In one embodiment, OLT is connected to a service station 210, similarly is a central office and/or a headend station.The service that the service station provides can comprise that data network connects, and acoustic network connects, and/or video network connects.The example of the connection protocol that uses between service station and OLT can comprise OC-x, Ethernet, E1/T1, DS3, and wideband video.In one embodiment, ONU is connected to an end users' system or systematic group 214, and they may comprise a local area network (LAN), PC, a PBX, phone, video graphics array box, and/or TV.The example of the connection protocol that uses between end users' system and ONU can comprise the 10/100Mb/s Ethernet, T1, and plain old telephone service (POTS).
At the passive light distribution network shown in Fig. 2 a tree-like topological structure is arranged, it comprises an ordinary optic fibre 210 (trunk line optical fiber) and the peculiar optical fiber 216 of a plurality of ONU-, and they are connected by a passive light deconcentrator/coupler 212.One on down direction the optical signal transmission of (from OLT202 to ONU204) become a plurality of peculiar light signals of ONU-that have same information by the light separated time.Light signal in up direction (from ONU to OLT) transmission is optically coupled in the trunk line optical fiber that connects between coupler and OLT.As what will explain in detail below, the time division multiplexing technology that is used on the variable-length time slot is used to up direction, avoids the interference from the uplink of two or more ONU.
In the embodiment of Fig. 2, a light signal on down direction with one with the light signal of up direction different wavelength (or frequency) propagate.In one embodiment, downlink traffic is in the 1550nm band transmission, and uplink traffic is in the 1310nm band transmission.On the uplink and downlink direction, use different wavelength, make a single optical fiber can transmit the descending obstruction that does not have interference with uplink traffic simultaneously.In an alternate embodiments, the descending and uplink optical fibers of separating can be used to the passive light distribution network.In addition, wavelength-division multiplex technique (WDM) can be used in descending and/or up direction increases transmission bandwidth.
Although the passive optical distribution network among Fig. 2 has a tree topology, but might be other alternative network topology structures.Alternative network topology structure comprises a bus topolopy and a ring topology structure.In addition, only have single optical fiber to connect between networking component although the distribution network of Fig. 2 has been described, unnecessary optical fiber can be added between the networking component so that error protection to be provided.
Fig. 3 is the expanded view of the single-point of Fig. 2 to the example OLT among the multiple spot PON 302.The functional unit that comprises among OLT is 323, one optical transmitting sets 324 of 322, one time slot controllers of 320, one time division multiplexings of a package controller (TDM) controller and an optical receiver 326.Everybody functional unit of knowing that OLT can also comprise that other is not mentioned.The package controller receives descending numerical data from a service station, and descending numerical data is formatted into the package of variable-length.The package controller can be specialized in hardware and/or in the software to be realized, and can be used as media interviews control (MAC) unit sometimes.In one embodiment, the package of each variable-length comprises the header of a regular length at the package front end, after header the pay(useful) load of a variable-length, and in the error detection zone (Frame Check Sequence (FCS) zone) of a regular length of package end.In one embodiment, the package of descending variable-length is formatd according to IEEE802.3 standard (being commonly referred to Ethernet) or any relevant IEEE802.3x substandard.In one embodiment, descending variable-length package is by the speed rates with 1G per second (Gb/s), as IEEE802.3z (being commonly referred to gigabit Ethernet) is defined, although can use lower or higher transmission rate.
In one embodiment, a large amount of descending numerical datas arrives the package controller in the IP packet, and the magnitude range maximum of packet can reach 65535 bytes.The package controller reads header information from the IP packet, and generation comprises the variable-length package of IP packet as pay(useful) load.In one embodiment, the length of each variable-length package is to be associated with the IP length of data package that is placed in the pay(useful) load.That is to say, if a downstream IP packet is 100 bytes, the variable-length package will comprise the pay(useful) load of 100 bytes so, add package extention (header and error detection zone), if and the IP packet is 1000 bytes, the variable-length package will comprise the pay(useful) load of 1000 bytes so, add the package extention.In one embodiment, package is formatd according to IEEE802.3, and the maximum length of a package is 1518 bytes (the package extentions of the pay(useful) load of 1500 bytes and 18 bytes).If an IP packet has surpassed 1500 bytes, the IP packet is divided into a plurality of IP packets so, is transmitted in a plurality of variable-length packages.On the contrary, the single-point on an ATM-basis is not considered the size of former IP packet to multiple spot PON, and the IP packet is divided into the fragment of 48 bytes, and the header that adds 5 bytes is then made each atm cell.When network traffics mainly are made up of the IP flow, use ATM to increase the bandwidth that consumes by package appendix branch greatly as the data connection protocol on to multiple spot PON at a single-point.Although IP is described to the agreement of a general higher level, other agreements, for example IPX and Appletalk also can be applied to PON.
The downstream of the flow of TDM controller 322 controls from OLT to ONU of the OLT302 described in Fig. 3.What particularly point out is that the TDM controller is controlled downlink frame, and distributes the variable-length package that bandwidth is given needs downlink transfer.The TDM controller can pass through hardware and/or software mode specific implementation.
Time slot controller 323 comprises logicality, is used for the length of time division multiplexing processing from the variable-length time slot of the uplink traffic of ONU with control.Especially, the length (be defined as a transmission intercal) of time slot controller by stipulating the distinctive variable-length time slot of each ONU-has been stipulated each ONU transmittability.When the uplink traffic by ONU decision changed, time slot controller changed the length of the distinctive variable-length time slot of ONU-, to reach the variation of best adaptation uplink traffic demand.To provide more detailed description among the accompanying drawing 7A-7C below about the function of time slot controller.
Optical transmitting set 324 and optical receiver 326 provide the transition interface of photosignal.Optical transmitting set and receiver are well-known at single-point in to multiple spot PON field, just it are not further described in detail.
Fig. 4 has described the example of a downstream, and it is used the variable-length package and is transferred to ONU from OLT.In one embodiment, downlink traffic is divided into downlink frame, and they have fixing transmission intercal.Each downlink frame transmits the package of a plurality of variable-lengths.In one embodiment, clock information with the form of a sync mark 438, has shown the beginning of each downlink frame.In one embodiment, sync mark is the code of one 1 byte, and is by per two milliseconds of transmission primarieses, synchronous to guarantee ONU and OLT's.In one embodiment, sync mark of per two milliseconds of transmission.
In the embodiment of Fig. 4, the package of each variable-length is read by a specific ONU, and is shown as the number on each package, from 1 to N.In one embodiment, the package of variable-length is by according to the IEEE802.3 standard format, and by with 1GB/S speed downlink transfer.The expanded view of the package 430 of a variable-length has shown the header 432 in the package, variable-length pay(useful) load 434, and error detection zone 436.Because package has the pay(useful) load of variable-length, the size of each package is relevant with the size of pay(useful) load, the IP packet that for example transmits in pay(useful) load.Although the package of each variable-length is (the single-point broadcast package) that is read by a specific ONU among Fig. 4, some package can be read (broadcasting packages) by all ONU, and perhaps a specific ONU group reads (multiple spot broadcast package).
Fig. 5 is the expanded view of the single-point of Fig. 2 to an example ONU 504 among the multiple spot PON.The functional unit that is included among the ONU is 522, one optical transmitting sets 524 of 520, one TDM controllers of package controller, and an optical receiver 526.Everybody functional unit of knowing that ONU can comprise also that other are not described.The package controller receives the upstream digital data from an end users' system, and the upstream digital data formats is changed into the package of variable-length.The package of each variable-length comprises a header, a pay(useful) load and an error detection zone, with illustrate in the above mentioned downlink traffic the same.The package controller can pass through software and/or hardware specific implementation, and can be used as a MAC unit sometimes.When being accompanied by downlink traffic, in one embodiment, up variable-length package is by according to the IEEE802.3 standard format, and with the 1Gb/S speed rates.In one embodiment, a large amount of upstream digital data arrives the package controller in the IP packet.In one embodiment, the package controller reads header information from up IP packet, and generation comprises the package of IP packet as the variable-length of pay(useful) load.In one embodiment, the length of the package of each up variable-length, relevant with IP data packet length separately.In many realizations, uplink traffic connects arrival ONU through an Ethernet, and therefore flow does not need to be reformatted into the Ethernet package.
The TDM controller 522 of each ONU 504 as shown in Figure 5, is being controlled the upstream of the flow from each ONU to OLT.Specifically, the TDM controller of each ONU with OLT, is guaranteed to transmit up variable-length package in the variable-length time slot of the appointment of other ONU of branch in timesharing multiple access (TDMA) agreement.In order to make the transmitting synchronousization between a plurality of ONU, ONU is used to keep synchronised clock from the timing information of OLT.Between on-stream period, each ONU has been distributed the distinctive variable-length time slot of ONU-by OLT, sets up this reason, is in order to make the uplink traffic from a plurality of ONU, after they are attached to trunk line optical fiber, can not conflict mutually.That is to say the time slot of the distinctive variable-length of ONU-, on trunk line optical fiber, in time can be not overlapping.Must be by note be that the Ethernet of prior art uses CSMA/CD to guarantee that as medium access control protocol all transmission on a shared medium do not arrive their final destination intrusively.CSMA/CD has limited the largest interval distance between the ONU, and the single-point that has therefore limited an Ethernet and CSMA/CD basis to multiple spot PON as a local survival ability that is connected network configuration.Utilize time division multiplexing as a medium access control protocol, the spacing distance between ONU can not limited by the CSMA/CD interference region.
Fig. 6 has described the example of a uplink traffic, and it is handled in the common fiber shown in Figure 2 210 by time division multiplexing, disturbs between the uplink traffic from a plurality of ONU204 avoiding.In the embodiment shown in fig. 6, uplink traffic is divided into uplink frame, and each uplink frame further is divided in the distinctive variable-length time slot of ONU-.Although the variable-length time slot among Fig. 6 is described identical length, the length of time slot can become look like down shown in Fig. 7 A-7C like that.In one embodiment, uplink frame forms by a continuous interval transmission, for example, and two milliseconds.In one embodiment, the starting point of each system-frame is determined (not showing) by a frame header, and uplink frame can be a regular length, maybe can be transformable length, adapting to different traffic demands, or creates different flow rate modes.
The distinctive variable-length time slot of ONU-is in each uplink frame internal interval transmission, and it is specifically designed to the transmission from the package of specific ONU.In one embodiment, each ONU has a special corresponding distinctive variable-length time slot of ONU-in each uplink frame.Give an example, about Fig. 6, each uplink frame is divided into N time slot, each variable-length time slot related respectively from 1 to N ONU.Comprise uplink frame and 32 ONU with equal bandwidth distribution of 2 milliseconds in one embodiment, each time slot representative is less than the transmission time of about 62.5 μ s.In the uplink speed of a 1GB/S, each time slot approximately can transmit 7800 bytes.
The TDM controller of each ONU, with together from the timing information of OLT, controlling the transmit timing of the variable-length package in the corresponding specially variable-length time slot, and the time slot controller in OLT specifies in the length of the distinctive time slot of each ONU-in the system-frame.Fig. 6 has shown the expanded view of a distinctive variable-length time slot of ONU-(for example special time slot corresponding to ONU-4), and it comprises 2 variable- length packages 640 and 642, and some time slot extentions 644.In one embodiment, the time slot extention comprises a buffer zone, timing indicator and signal excitation indicating device.Although Fig. 6 has only shown two variable-length packages in the peculiar time slot of ONU-, more variable-length package can be transmitted in each time slot.Same, if there is not flow to transmit from ONU, a time slot can be filled by the signal of a free time so.
Fig. 6 has also described an expanded view of the variable-length package 642 in the distinctive variable-length time slot of ONU-.The expanded view of variable-length package 642 has shown header 632, variable-length pay(useful) load 634, and error detection zone 636.In the embodiment of Fig. 6, the pay(useful) load of variable-length package is the part of an IP packet or an IP packet, and the length of variable-length package is relevant with the IP length of data package.
Fig. 7 A-7C is about how using time slot controller to change the length of the distinctive variable-length time slot of ONU-to adapt to the example from the uplink traffic demand of ONU.In Fig. 6, the distinctive variable-length time slot of all ONU-all has same length, and in Fig. 7 A-7C, the distinctive variable-length time slot of ONU-has different length, and they change the change with the uplink traffic demand that adapts to come ONU.Mention in the example of Fig. 7 A, with respect to the time slot allocation among Fig. 6, the length of the peculiar time slot 4 of ONU-has increased, and with respect to the time slot allocation among Fig. 6, and peculiar time slot 2 of ONU-and 3 length reduce.The length of uplink frame is fixed in one embodiment, the increase of the length of a distinctive variable-length time slot of ONU-, require the total length of the distinctive variable-length time slot of other ONU-to reduce the quantity that equates, constant with the total length that remains on the time slot in the uplink frame.Because the length of the peculiar time slot 4 of ONU-has increased, ONU-4 can transmit more data at interval at multiplex frame, with respect to it under time slot allocation shown in Figure 6, transmitted for.Same because the length of the peculiar time slot 2 of ONU-and 3 reduces, ONU-2 and ONU-3 can a multiplex frame at interval on the less data of transmission, with respect to they under time slot allocation shown in Figure 6, transmitted for.
Fig. 7 B showed within the time interval of a uplink frame, another variation of the distinctive variable-length time slot of ONU.Shown in Fig. 7 B, distinctive variable-length time slot 1 of ONU-and 2 size have increased with respect to the distribution among Fig. 7 A, the size that the distinctive variable length of ONU-becomes time slot 4 has reduced with respect to the distribution among Fig. 7 A, and the size of distinctive variable-length time slot 3 of ONU-and N does not change with respect to the distribution among Fig. 7 C.
Fig. 7 C showed within the time interval of a uplink frame, another variation of the distinctive variable-length time slot of ONU.Shown in Fig. 7 C, the size of the distinctive variable-length time slot 4 of ONU-has increased with respect to the distribution among Fig. 7 B, the distinctive variable- length time slot 1,2 of ONU-, keep constant with N, and the distinctive variable-length time slot 3 of ONU-is by cancellation with the distribution among Fig. 7 B.In one embodiment, the distinctive variable-length time slot of complete ONU-can be by cancellation, if this ONU does not have uplink traffic to transmit.In another embodiment, the distinctive variable-length time slot of ONU-can only transmit a spot of flow, and it comprises, give an example, and the signal of a free time or upstream operation, and keep required information.
A technology that changes the length of variable-length time slot with the method for synchronization has been described in Fig. 8 and Fig. 9.This technology has been used time slot table and synchronization frame, realizes changing with the method for synchronization length of variable-length time slot.A time slot table is the information that one group of time slot controller from OLT sends to ONU, and it comprises the time slot allocation information of each ONU.In one embodiment, the time slot table comprises timeslot number, start position, and the length of each variable-length time slot of corresponding each ONU.In one embodiment, the timing information in the time slot table is taken as many countings that come from each uplink frame indicating device beginning and discerns.For example, a uplink frame of 2 milliseconds when being controlled by the 25MHZ clock comprises 50000 countings.For the time slot allocation of the change ONU of success, the time slot allocation of all ONU must change simultaneously.Therefore, before a change took place, all ONU must receive same time slot table, and changing fully of new time slot table must carry out on all ONU simultaneously.
According to the technology that changes the variable-length slot length, synchronization frame is known as " special frames ", by the descending transmission of OLT.In one embodiment, special frames is by 322 generations of TDM controller and with regular time descending transmission at interval.In one embodiment, special frames is discerned by the special frames indicating device of special 10 bits.Special frames is determined to be used for the nearest time slot table of uplink by ONU.If the time slot controller of OLT has generated a new time slot table and if ONU has received this new time slot table, OUN will get started and use new time slot table to carry out uplink after receive a special frames indicating device so.Uplink frame all after new time slot table is used for are distributed time slot, receive next special frames up to ONU.In one embodiment, a new time slot table is generated, and is used for each special frames, and in an alternate embodiments, new time slot table is generated, as the compensation to the change in the uplink traffic load.In one embodiment, the special frames indicating device by per 60 milliseconds of transmissions once, and each special frames has contained 30 uplink frame, 2 milliseconds of every frames.By 60 milliseconds special frames, the length of the peculiar time slot of ONU-of variable-length can be changed once at per 60 milliseconds.
Fig. 8 has shown a process chart of time slot control technology, and Fig. 9 shown according to the relevant special frames of step of process chart shown in Figure 8, frame, and time slot are to the timing of uplink traffic.As Fig. 8, in step 802, a special frames indicating device arrives ONU.In steps A
N, ONU brings into use time slot table N operation.Time slot table N is used as an initial time slot table and is used for the example purpose, and supposition ONU had before received this time slot table from the time slot controller of OLT.As Fig. 9, steps A
NAppear at the beginning of first special frames, and time slot uniform distribution as shown in Figure 6.At step B
N, OLT transmission time slot table N+1 is to ONU, and ONU has received new time slot table N+1.As Fig. 9, step B
NAppear at designated time intervals.At step C
N, ONU determines to receive time slot table N+1 and transmits current ONU-particular flow rate demand data to OLT.The present flow rate demand data can comprise queue length, deferred message and bandwidth predetermined information.As Fig. 9, step C
NAppear at designated time intervals.At step D
N, OLT receives the present flow rate load data from ONU, and OLT generates a new time slot table, time slot table N+2 with reference to the present flow rate load data from ONU.As Fig. 9, step D
NAppear at designated time intervals.
At judging point 804, determined whether a new special frames indicating device arrives ONU.If a new special frames indicating device does not arrive ONU, so existing time slot table can not change.Yet, if new special frames indicating device arrives ONU, so in steps A
N+1, ONU brings into use time slot table N+1 operation.As Fig. 9, steps A
N+1Appear at the beginning of second special frames, and time slot is distributed on the basis of each frame shown in Fig. 7 A.At step B
N+1, OLT transmission time slot table N+2 is to ONU, and ONU has received new time slot table N+2.As Fig. 9, step B
N+1Appear at designated time intervals.At step C
N+1, ONU acknowledges receipt of time slot table N+2 and transmits the peculiar flow load data of current ONU-and gives OLT.As Fig. 9, step C
N+1Appear at designated time intervals.At step D
N+1, OLT receives the present load data from ONU, and OLT generates a new time slot table, time slot table N+3 with reference to the present flow rate load data from ONU.As Fig. 9, step D
N+1Appear at designated time intervals.
At judging point 806, determined whether a new special frames indicating device arrives ONU.If a new special frames indicating device does not arrive ONU, so existing time slot table can not change.Yet, if new special frames indicating device arrives ONU, so in steps A
N+2, ONU brings into use time slot table N+2 operation.As Fig. 9, steps A
N+2Appear at the beginning part of the 3rd special frames, and time slot is distributed on the basis of each frame shown in Fig. 7 B.
Treatment progress continuation as describing so the length of time slot is constantly adjusted, adapts to current flow load data in a synchronous manner.In an alternate embodiments, step B
x, C
x, and D
xNot fully by the same continued operation shown in Figure 9.That is to say that some operation may take place simultaneously.In another alternate embodiments, next time slot table is generated by OLT, and by in same special frames, rather than in the special frames of following, be transferred to ONU.
In one embodiment, the length of uplink frame can change according to demand.In one embodiment, the length of each uplink frame is a multiple of special frames, for example, is the 1/10th, 1/15,1/20 of a special frames, or 1/25.Its multiple can be changed adapting to traffic demand, and/or creates a special flow rate mode.
In another embodiment, the length of uplink frame can be a multiple of 125 microseconds.The length of uplink frame is a multiple of 125 microseconds, and PON just is consistent with the synchronous communication network that uses 125 microsecond frames easily like this.In one embodiment, uplink frame and special frames all are the multiples of 125 microseconds.
The process chart of Figure 10 has been described a method of exchange message between an OLT and a plurality of ONU.A step 1002, downlink data is transferred to ONU by in the package of variable-length from OLT.In a step 1004, upstream data using time division multiplexing to transmit in the distinctive variable-length time slot of ONU-of interference avoiding, is transferred to OLT from ONU, and wherein the distinctive variable-length time slot of ONU-is filled by the up package of variable-length.
Claims (45)
1. a single-point comprises the multiple spot light communication system:
An optical line terminal (OLT); With
In a large number be connected to distal end optical network unit (ONUs) on the above-mentioned OLT by an EPON, downlink data is transferred to above-mentioned ONUs from above-mentioned OLT on above-mentioned EPON therein, and upstream data is transferred to above-mentioned OLT from above-mentioned ONUs on above-mentioned EPON;
Above-mentioned OLT, on above-mentioned EPON, transmitting downlink data in the variable-length package;
Above-mentioned ONUs, on above-mentioned EPON, transmit ascending data in the distinctive variable-length time slot of the ONU-that has used time division multiplexing, the distinctive variable-length time slot of wherein above-mentioned ONU-is filled by the up package of a plurality of variable-lengths.
2. in the described system of claim 1, further comprised a time slot controller in the communication between above-mentioned OLT and above-mentioned ONU, be used to change the length of the distinctive variable-length time slot of above-mentioned ONU-, to adapt to above-mentioned uplink traffic demand from ONU.
3. in the described system of claim 2, above-mentioned time slot controller comprises logicality, and the length that is used to increase the peculiar time slot of an ONU-is to adapt to the increase of the desired uplink traffic of an ONU, and an above-mentioned ONU is among above-mentioned a plurality of ONU.
4. in the described system of claim 3, above-mentioned time slot controller comprises logicality, and the length that is used to reduce one the 2nd peculiar time slot of ONU-is with the above-mentioned increase of the length that adapts to the peculiar time slot of an above-mentioned ONU-.
5. in the described system of claim 2, above-mentioned time slot controller comprises logicality, and the length that is used to reduce the peculiar time slot of an ONU-to be adapting to the minimizing of the desired uplink traffic of an ONU, and an above-mentioned ONU is among above-mentioned a plurality of ONU.
6. in the described system of claim 2, further comprised a time division multiplexing controller in above-mentioned OLT, be used to generate the descending special frames that sends above-mentioned ONU to, it is used to the above-mentioned transmitting uplink data of synchronization.
7. in the described system of claim 6, wherein said time slot controller generates the time slot table that is adapted to the traffic demand data, and therein as the response that receives a special frames, described ONU brings into use a new time slot table.
8. in the described system of claim 6, wherein the length of uplink frame is the multiple of described special frames.
9. in the described system of claim 1, wherein uplink frame has length variable.
10. in the described system of claim 1, wherein uplink frame is a multiple of 125 microseconds.
11. in the described system of claim 1, the descending package of wherein said variable-length is formative according to IEE802.3.
12. in the described system of claim 1, the descending package of wherein said variable-length includes Internet agreement (IP) packet.
13. in the described system of claim 12, the length of the descending package of wherein said variable-length is relevant with described IP length of data package.
14. in the described system of claim 1, the up package of wherein said variable-length is formative according to IEE802.3.
15. in the described system of claim 1, the up package of wherein said variable-length includes Internet agreement (IP) packet.
16. the described system of claim 15, the length of the up package of wherein said variable-length is relevant with described IP length of data package.
17. on the EPON of a single-point to multiple spot, the method for exchange message comprises between an optical line terminal (OLT) and a plurality of distal end optical network units (ONU):
In the descending package of variable-length, from above-mentioned OLT transmitting downlink data to above-mentioned ONU;
Using time division multiplexing to avoid transmitting in the distinctive variable-length time slot of ONU-of interference, to above-mentioned OLT, the distinctive variable-length time slot of wherein said ONU-is filled by the up package of variable-length from above-mentioned ONU transmit ascending data.
18. the described method of claim 17 has further comprised a step, in order to change the length of the distinctive variable-length time slot of above-mentioned ONU-, to adapt to the uplink traffic demand from above-mentioned a plurality of ONU.
19. the described method of claim 18 has further comprised a step, it has increased the length of the peculiar time slot of an ONU-to adapt to the increase from the uplink traffic demand of an ONU, and a described ONU is among above-mentioned a plurality of ONU.
20. the described method of claim 19 has further comprised a step, the length that it has reduced the peculiar time slot of the 2nd ONU-is with the above-mentioned increase of the length that adapts to the peculiar time slot of a described ONU-.
21. the described method of claim 17 has further comprised a step, the length that it has reduced the peculiar time slot of an ONU-to be adapting to the minimizing from the uplink traffic demand of an ONU, and an above-mentioned ONU is among above-mentioned a plurality of ONU.
22. the described method of claim 17 has further comprised a step, it from above-mentioned OLT downlink transfer special frames to above-mentioned ONU, to keep the synchronism of above-mentioned transmitting uplink data.
23. the described method of claim 22 has further comprised following steps:
Corresponding traffic demand data generate a time slot table; With
Receive under the prerequisite of a special frames from above-mentioned OLT at above-mentioned ONU, trigger the use of above-mentioned time slot table.
24. the described method of claim 23, wherein the length of uplink frame is the multiple of above-mentioned special frames.
25. the described method of claim 17, wherein uplink frame is a variable-length.
26. the described method of claim 17, wherein uplink frame is a multiple of 125 microseconds.
27. the described method of claim 17, the descending and up package of wherein said variable-length is to carry out formative according to the IEEE802.3 agreement.
28. the described method of claim 17, descending and the up package of wherein said variable-length comprises a header and a pay(useful) load, and the length of above-mentioned therein variable-length package is relevant with an Internet agreement (IP) length of data package in the pay(useful) load that is comprised in above-mentioned variable-length package.
29. the described method of claim 17 has further comprised following steps:
Descending Internet agreement (IP) packet is embedded in the descending package of variable-length; And
Up Internet agreement (IP) packet is embedded in the up package of variable-length.
30. the described method of claim 29, the descending and up package of wherein said variable-length is according to the IEEE802.3 formatted.
31. the described method of claim 17, the step of wherein said transmitting downlink data has comprised in the constant time interval transmission to the down-going synchronous mark.
32. the described method of claim 17, the distinctive variable-length time slot of wherein said ONU-is filled by a plurality of variable-length packages.
33. a single-point comprises the multiple spot light communication system:
An optical line terminal (OLT); With
In a large number be connected to distal end optical network unit (ONU) on the above-mentioned OLT by an EPON, downlink data is transferred to above-mentioned ONU from above-mentioned OLT on above-mentioned EPON therein, and downlink data is transferred to above-mentioned OLT from above-mentioned ONU on above-mentioned EPON;
Above-mentioned OLT comprises the method that downlink data packet is formatted into the descending package of variable-length;
Each above-mentioned ONU comprises:
The upstream data packet format is changed into the method for the up package of variable-length; And
The transmit timing method of the above-mentioned variable up package that conforms to the distinctive variable-length time slot of ONU-interferes with each other with the up package of ONU from other avoiding.
34. the system of claim described 33, wherein said OLT comprise a time slot controller in the communication with above-mentioned ONUs, be used to change the length of the distinctive variable-length time slot of above-mentioned ONU-, to adapt to the uplink traffic demand from above-mentioned ONUs.
35. the described system of claim 34, wherein said time slot controller comprises logicality, and the length that is used to increase the peculiar time slot of an ONU-to be adapting to the increase of the desired uplink traffic of an ONU, and an above-mentioned ONU is among the above-mentioned ONUs.
36. the described system of claim 35, wherein said time slot controller comprises logicality, and the length that is used to reduce one the 2nd peculiar time slot of ONU-is with the above-mentioned increase of the length that adapts to the peculiar time slot of an above-mentioned ONU-.
37. the described system of claim 34, wherein said time slot controller comprises logicality, the length that is used to reduce the peculiar time slot of an ONU-to be adapting to the minimizing of the desired uplink traffic of an ONU, and an above-mentioned ONU is among above-mentioned a plurality of ONUs.
38. the described system of claim 33 has further comprised a time division multiplexing controller (TDM) among above-mentioned OLT, be used to generate special frames, this special frames is sent to above-mentioned ONU to keep the synchronism of above-mentioned transmitting uplink data by descending.
39. the described system of claim 38, the corresponding traffic demand data of described therein time slot controller generate the time slot table, and conduct is for the response that receives a special frames therein, and above-mentioned ONUs brings into use a new time slot table.
40. in the described system of claim 33, the descending package of described variable-length is to carry out formative according to IEEE802.3.
41. in the described system of claim 33, described downlink data packet is Internet agreement (IP) packet.
42. in the described system of claim 41, the length of the descending package of described variable-length is relevant with above-mentioned IP length of data package.
43. in the described system of claim 33, the up package of described variable-length is to carry out formative according to IEEE802.3.
44. in the described system of claim 33, described upstream data bag is Internet agreement (IP) packet.
45. in the described system of claim 44, the length of the up package of described variable-length is relevant with above-mentioned IP length of data package.
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| US71524800A | 2000-11-17 | 2000-11-17 | |
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Country Status (4)
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| EP (1) | EP1342106A4 (en) |
| JP (1) | JP2004528784A (en) |
| CN (1) | CN1484933A (en) |
| WO (1) | WO2002097476A2 (en) |
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| WO2010045860A1 (en) * | 2008-10-21 | 2010-04-29 | 华为技术有限公司 | Method, equipment and system for eliminating interference in passive optical network system |
| CN101127759B (en) * | 2006-08-15 | 2010-07-07 | 华为技术有限公司 | A receiving and transmission method, device and system for passive optical network data |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2004528784A (en) | 2004-09-16 |
| EP1342106A2 (en) | 2003-09-10 |
| WO2002097476A3 (en) | 2003-05-01 |
| EP1342106A4 (en) | 2004-12-08 |
| WO2002097476A2 (en) | 2002-12-05 |
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