CN101895367A

CN101895367A - Method, network equipment and system for data transmission

Info

Publication number: CN101895367A
Application number: CN2009101076134A
Authority: CN
Inventors: 操时宜; 李汉国
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2009-05-22
Filing date: 2009-05-22
Publication date: 2010-11-24

Abstract

The invention discloses a method, network equipment and a system for data transmission, which can be applied to star and tree networks and dual-homing looped networks. The method comprises that: in a downlink direction, a master node transmits a downlink service signal to a slave node in a mode of optical layer broadcast, wherein a continuous optical signal which carries the downlink service signal also comprises an uplink bandwidth map; the slave node and the master node are connected by an OB (Optical Burst optical burst) channel; and the slave node adapts an uplink service signal to different OBUs for performing photoelectric conversion and transmitting a burst optical signal in a burst mode according to the number and serial number of the OBUs distributed to nodes in the uplink bandwidth map transmitted by the master node. The method, equipment and system easily realize burst amplification and high-speed burst receiving so as to better meet the requirements on long distance, large bandwidth and high transmission quality.

Description

A kind of data transmission method, the network equipment and system

Technical field

The present invention relates to the communications field, relate in particular to a kind of data transmission method, the network equipment and system.

Background technology

In metropolitan area transport network, access point generally is linked into convergent point by the mode of optical fiber direct connection; And in data communication network, the DSLAM (Digital Subscriber Line Access Multiplexer Digital Subscriber Line Access Multiplexer) that is positioned at marginal layer generally is connected on the switch by the mode of optical fiber direct connection.Therefore, the marginal layer of metropolitan area transport network exists a large amount of stars or tree-like networking.

On the other hand, in recent years because the customer flow sustainable growth, the demand that traditional copper cash transmission technology can not user's access bandwidth, the technology PON of main flow among the FTTx (Passive Optical Network EPON) begins to rise.The PON technology has increased the bandwidth of optical fiber access and has prolonged transmission range greatly.For example: the transmission range that optical fiber can be supported on the speed of 10M can reach tens and even kilometer up to a hundred.Simultaneously, the expansion of transmission range then mean number of users that a convergent point can insert in other words area coverage greatly increase.Therefore, there is following variation tendency in existing metropolitan area transport network:

The first, access network and transmission network merge gradually, require to extend as far as possible transmission range, increase area coverage, office point in the middle of reducing;

The second, the multiple business network integration, i.e. Trip-PLAY, video, voice and data may insert simultaneously, also will guarantee the transmission demand of the higher business of quality requirement such as voice, special line and video medical treatment;

The 3rd, the development along with big band width service such as HDTV, IPTV, video-game must promote the further growth of user bandwidth.

More than the summary, (these two parts may progressively merge) exists a large amount of stars or the demand of tree-like networking at metropolitan area transport network or in Access Network from now on.Simultaneously, such network requires to satisfy long distance, big bandwidth, high-transmission quality again.

At the demand scene, one of existing technology is CWDM/WDM (comprising WDM-PON, i.e. wavelength division multiplexing PON), and its main feature is point-to-point transmission.As shown in Figure 1, S-Node is a host node, and L-Node is from node.Be no more than under the line speed situation from the flow between node and the host node at each, then each then needs 2 optical modules from all adopting a wavelength between node and the host node.Whole system needs 2*N optical module among Fig. 1.Adopt the CWDM/WDM technology, adopt independent wavelength transmission data from node and host node, bandwidth can reach 2.5G, and transmission quality can be guaranteed.The transmission range aspect can reach tens kilometers, even farther.

Yet, adopt the major defect of CWDM/WDM technology to be that required optical module quantity is too much.As shown in Figure 1, whole system needs 2*N optical module, causes networking cost higher.In addition, because the number of wavelengths of transmitting in the optical fiber is limited, therefore, adopt the CWDM/WDM mode, it is limited from number of nodes that system can support.

At the demand, another prior art is PON (mainly referring to TDMAPON here, i.e. multiplexing PON of time-division).As shown in Figure 2, send to the mode of broadcasting from the The data of node (L-Node) from host node (S-Node), and the mode of the burst of the The data from the node to the host node sends all reception bandwidth from the nodes sharing host node.As can be seen, whole PON system only needs N+1 optical module, and than the mode of CWDM/WDM, quantity greatly reduces.

The inventor finds in the research process to prior art: there is following problem (with G-PON is example, and the question marks of E-PON are seemingly) in the PON system applies in above-mentioned scene:

At first, be that transmission quality needs further to promote.In the GPON system, all be elongated from the optical burst signal of node.Host node goes out bandwidth map and is handed down to from node by DBA (Dynamic Bandwidth Allocation Dynamic Bandwidth Allocation) algorithm computation, wherein, comprise each burst length and position in the bandwidth map, carry out data from node according to the upstream bandwidth map and send from node.Like this, the adjustment of a node bandwidth will cause other node burst position to change.Do not need the bandwidth adjustment even this means other node, yet can the shaking of its business clock.

Secondly, the GPON technology designs based on less relatively bandwidth for adaptive existing Access Network, therefore the bandwidth adjustment is to be granularity with the byte, in order to guarantee certain bandwidth availability ratio, therefore the interval between the burst can not be too big simultaneously, and the leading time in the burst can not be oversize.These restrictions make burst receiver and employing EDFA (Erbium Doped Fiber Amplifier erbium-doped fiber amplifier) amplify, and realize all very difficult.

At transmitting that net inserts layer by layer or the needs of Access Network middle and long distance, big bandwidth, high-transmission quality, also having a kind of prior art is WDM+TDM PON, has both had wavelength division multiplexing in this network that is:, also has time division multiplexing.As shown in Figure 3, down direction, host node S-Node adopt continuous mode to send, and send data by a plurality of wavelength, carry out wavelength separated through channel-splitting filter and deliver to different couplers; Coupler is delivered to different from node L-Node along separate routes by light; Up direction adopts burst mode to send data from node, after the process coupler closes the road, sends into wave multiplexer again and carries out delivering to host node S-Node behind the wavelength multiplexing.This technical scheme can reach big splitting ratio, for example: can be implemented in and support 40 ripples in the same optical fiber; Coupler supports that splitting ratio can reach 1: 1280 under the condition of shunt in 1: 32.

Because the coupler and the wave splitting/composing device Insertion Loss that adopt among the WDM+TDM PON are all bigger, generally in above-mentioned network, all need light to put capable luminous power compensation into.In WDM+TDM PON system, time division multiplexing partly still adopts TDMAPON scheme in the prior art two, that is to say, along with the bandwidth situation adjustment changes, the length of light burst remains unfixing, and the position also can change.Because the light of different wave length burst starting position may be adjacent successively.At this moment adopt multi-wavelength light to put and to cause to influence each other between the different wave length.That is to say the input of putting at light, a wavelength input optical power change (corresponding light burst beginning or the position of finishing), correspondingly, at output,, also can cause its Output optical power to change even the input power of another one wavelength does not change.Like this, will cause the luminous power on some wavelength continue to change, and change frequency and amplitude uncertain, finally may cause burst receiver power blockage mistake or can't lock, correct received signal, system is unavailable.But if do not adopt luminous power to amplify, WDM+TDM PON technology can not satisfy the demand of long distance, big bandwidth.

Summary of the invention

The embodiment of the invention provides a kind of method, the network equipment and system of transfer of data, can support long distance, and the demand of big bandwidth, high-transmission quality realizes easily that simultaneously burst is amplified and the two-forty burst receives.

For achieving the above object, the embodiment of the invention provides a kind of data transmission method, and this method comprises:

First node receives the optical burst signal that Section Point sends, and converts described optical burst signal to corresponding signal of telecommunication light burst unit OBU; Wherein, the length relative fixed of described optical burst signal;

Described first node is separated the adaptive uplink service signal that goes out from described light burst unit OBU, and extracts the uplink bandwidth request information of described Section Point from described OBU;

Described first node calculates according to the upstream bandwidth calculating parameter that comprises described uplink bandwidth request information and obtains the upstream bandwidth map;

Described first node is fitted to downlink business signal and described upstream bandwidth map in the continuous mode signal, carries out the electric light conversion, and sends with the continuous mode light signal.

An alternative embodiment of the invention provides a kind of data transmission method, and this method comprises:

Section Point receives the continuous mode light signal that has carried downlink business signal and upstream bandwidth map that first node sends, and carries out opto-electronic conversion, obtains carrying the continuous mode signal of described downlink business signal and upstream bandwidth map;

Described Section Point extracts from described continuous mode signal need be at the downlink business signal and the upstream bandwidth map of this node whereabouts;

Described Section Point is according to described upstream bandwidth map, and the uplink bandwidth request information of uplink service signal and described Section Point is fitted in the light burst unit OBU signal;

Described Section Point carries out the electric light conversion to described light burst unit OBU, produces optical burst signal, sends with burst mode; Wherein, described optical burst signal length relative fixed.

The embodiment of the invention also provides a kind of network equipment, comprising:

The continuous mode optical receiver, be used to receive the continuous mode light signal that has carried downlink business signal and upstream bandwidth map, and described continuous mode light signal carried out opto-electronic conversion, obtain carrying the continuous mode signal of described downlink business signal and upstream bandwidth map;

The descending adaptation module of separating is used for extracting the downlink business signal that falls in this locality from described continuous mode signal, and extracts the upstream bandwidth map from the expense of described continuous mode signal;

Up adaptation module is used for according to described upstream bandwidth map uplink service signal and uplink bandwidth request information being fitted in the transport layer container, and then the transport layer container is fitted among the light burst unit OBU;

The burst mode transmitter is used for described light burst unit OBU is carried out the electric light conversion, forms optical burst signal, sends with burst mode; Wherein, the length relative fixed of described optical burst signal.

Burst mode optical receiver is used to receive the optical burst signal that has carried uplink service signal and uplink bandwidth request information and carries out opto-electronic conversion, converts described optical burst signal to light burst unit OBU; Described optical burst signal length relative fixed;

The up adaptation module of separating is used for separating the adaptive described uplink service signal that goes out from described light burst unit OBU, and extracts described uplink bandwidth request information;

The upstream bandwidth manager obtains the upstream bandwidth map according to upstream bandwidth map calculation calculation of parameter;

Descending adaptation module is used for the payload section of downlink business signal adaptation to the continuous mode signal, and carries described upstream bandwidth map in the expense of described continuous mode signal;

The continuous mode optical transmitter is used for described continuous mode signal is carried out the electric light conversion, and sends with the continuous mode light signal.

The embodiment of the invention provides a kind of network system, and a kind of network system is characterized in that, comprises a first node, at least one Section Point; Wherein:

Described first node receives the optical burst signal that Section Point sends, and converts described optical burst signal to corresponding signal of telecommunication light burst unit OBU; Wherein, the length relative fixed of described optical burst signal; From described light burst unit OBU, separate the adaptive uplink service signal that goes out, and from described OBU, extract the uplink bandwidth request information of described Section Point; Calculate acquisition upstream bandwidth map according to the upstream bandwidth calculating parameter that comprises described uplink bandwidth request information; Downlink business signal and described upstream bandwidth map are fitted in the continuous mode signal, carry out the electric light conversion, and send with the continuous mode light signal;

Described Section Point receives the continuous mode light signal that has carried downlink business signal and upstream bandwidth map that first node sends, and carries out opto-electronic conversion, obtains carrying the continuous mode signal of described downlink business signal and upstream bandwidth map; Extracting from described continuous mode signal need be at the downlink business signal and the upstream bandwidth map of this node whereabouts; According to described upstream bandwidth map, the uplink bandwidth request information of uplink service signal and described Section Point is fitted in the light burst unit OBU signal; Described light burst unit OBU is carried out the electric light conversion, produce optical burst signal, send with burst mode; Wherein, described optical burst signal length relative fixed.

The embodiment of the invention also provides a kind of network system, comprises that the conduct of first host node and second host node and at least one network equipment is from node;

Wherein, described first host node send to described from node the continuous mode signal and describedly send to the optical burst signal of described second host node from node, adopt different wave length in unidirectional optical fiber, to transmit;

Described second host node send to described from node the continuous mode signal and describedly send to the optical burst signal of described first host node from node, adopt different wave length in unidirectional optical fiber, to transmit.

In the technical scheme of the embodiment of the invention,, make OBU length relative fixed by OB (burst of Optical Burst light) frame being divided into different OBU (Optical Burst Unit light burst unit).So-called length relative fixed if promptly the length of OBU is adjusted, needs the interdependent node on the prior notice link, and OBU length also can adopt fixed value and need not adjust certainly.Be more prone to lock input power at burst in leading time when burst receiver receives, the situation that the long period adjusts can not appear continuing in optical signal power, and receiver is more prone to correct reception, reduces the error rate.When multi-wavelength light amplified, the optical power change in the optical fiber was more regular, easily control; Simultaneously, can control signal be set in advance, realize that the burst of multi-wavelength is amplified according to OB frame head and OB length information.For receiver, the optical burst signal power fluctuation is limited in the beginning part (leading zone) of optical burst signal, receiver is easier to lock input power, realize correct the reception, more help supporting the application form of WDM+TDM PON, thereby convenient star and the tree network system that realizes farther distance and higher rate supports long distance, the application demand of big bandwidth, high-transmission quality.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Adopt CWDM/WDM to form the schematic diagram of star network in Fig. 1 prior art one;

Fig. 2 is a PON network architecture schematic diagram in the prior art two,

Fig. 3 is the network architecture schematic diagram of WDM+TDM PON in the prior art three;

Fig. 4 is the structural representation of network system in the embodiment of the invention;

Fig. 5 is the schematic diagram of OB frame in the embodiment of the invention;

Fig. 6 is the frame structure schematic diagram of light burst unit OBU in the embodiment of the invention;

A kind of service data transmission method schematic flow sheet that Fig. 7 provides for the embodiment of the invention;

Fig. 8 is the frame format schematic diagram of TPU in the embodiment of the invention;

Fig. 9 is the schematic diagram that the uplink service signal adaptation arrives OBU in the embodiment of the invention;

Figure 10 is the schematic diagram that TPU crosses over the OBU border in the embodiment of the invention

Figure 11 is fitted to the schematic diagram of OBU for GEM frame in the embodiment of the invention;

The structural representation of a kind of network equipment of providing in the embodiment of the invention is provided Figure 12;

The network equipment structural representation of a kind of compatible G-PON of providing in the embodiment of the invention is provided Figure 13;

Figure 14 is the schematic flow sheet of a kind of data transmission method in the embodiment of the invention;

Figure 15 is the schematic diagram of upstream bandwidth map in the embodiment of the invention;

Figure 16 is for determining the schematic diagram of the T-CONT quantity of actual allocated according to the T-CONT of initial calculation in the embodiment of the invention;

The structural representation of a kind of network equipment that Figure 17 provides for the embodiment of the invention;

The structural representation of the network equipment of a kind of compatible G-PON that Figure 18 provides for the embodiment of the invention;

Figure 19 is the structural representation of dual-homed looped network in the embodiment of the invention; And

Figure 20 is the schematic diagram of the master and slave node of dual-homed loop network in the embodiment of the invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.

Be data transmission method, the network equipment and network system in the clearer description embodiment of the invention of energy, the embodiment of the invention is an example with a communication network, but this communication network should not become limitation of the present invention.Embodiments of the invention provide a kind of system that is made up of two kinds of dissimilar nodes, can form the star or the tree-like network architecture.As shown in Figure 4, S-Node is a first node, can be used as host node in this network system; L-Node is a Section Point, can be used as from node in this network system.Host node and from connecting by optical fiber between the node can transmit data each other, does not have transfer of data between the node, is to isolate mutually.Host node is a down direction to the direction from node; Otherwise, be up direction from the direction of node-to-node.

In the network system that the embodiment of the invention provides, on the up direction, be to come the transport service signal to give host node by light burst (Optical Burst is hereinafter to be referred as OB) passage from node.The OB passage is the sub-wavelength passage that marks off on one or more wavelength of optical fiber, node is handled by the OB to the OB passage correspondence of bearer service data, thereby realizes the processing to the OB passage.Please refer to Fig. 5, Fig. 5 is the schematic diagram of OB frame in the embodiment of the invention.As shown in Figure 5, can on a wavelength, mark off several time slots respectively, be called the OB time slot.Wherein, t2 is the length of OB time slot, and the payload in the OB time slot is OB, and OB length is t1, just has transfer of data when t1 time inner laser device is opened; T3 is a guard time, and when guard time mainly referred to the OB transmission, receives and switches, optical device was opened, closed the required time.A plurality of OB time slots are formed a frame, are called the OB frame, and T is the frame period, forms a frame for OB1 to OBn shown in the figure.In a wavelength, be unit period transmission OB frame with T.Wherein the length of OB1, OB2......OBn can be identical, also can be different, and promptly the length of the OB time slot of Hua Fening can be identical, also can be different.The OB of different cycles same position forms an OB passage, for example OB1 passage, OB2 passage ... OBn passage etc.Need to prove that the duration of OB passage does not limit, promptly under the extreme case, an OB passage also may only continue the time of a frame.In this case, can realize the dynamic multiplexing of bandwidth by some control protocols.OBU (Optical Burst Unit, light burst unit) is OB corresponding signal of telecommunication (OB is a light signal) in the electricity layer, is the physical layer container in the electricity layer.In data transmission procedure, at first business datum can be adapted to OBU, and conversion forms OB to OBU through electric light, and these OB transmit with time interval T again, thereby finish the transmission of whole service data.

Fig. 6 is the frame format schematic diagram of OBU in the embodiment of the invention, as shown in Figure 6, OBU mainly comprise power blockage, regularly, demarcation, expense and payload, power blockage and regularly part also can merge, be called leading.Wherein, power blockage is used for the power of burst receiver locking OBU, regularly can be used for the clock that burst receiver recovers OBU, and demarcation can be used to make the border of OBU, comprise some controls or management information in other expenses, what payload carried is the payload of OBU.

In the embodiment of the invention, the length situation of OBU can have three types: first kind of different OBU length is isometric; Second kind of OBU length is different, but length fix, can not adjust; The third, OBU length can be adjusted, but it is slower to regulate the speed.The OBU of the third type when the length of OBU need be adjusted, can notify interdependent node on the link by certain mode in actual applications.Therefore, in the regular hour scope, OBU length can be thought relatively-stationary.In the description of back, all fix, and the identical situation of length of each OB is an example in OB frame with OBU length.The OB length variations is identical with not isometric situation processing procedure, no longer narrates at this.

Describe the network system of the embodiment of the invention below in detail, this network system can be star, tree-like or dual-homed loop network.Comprising a host node and at least one from node.This system can be used for different application scenarioss, and for example: it is multiplexing that time division multiplexing or wavelength division multiplexing add the time-division.Be that example is elaborated to this network system with time-multiplexed scene below:

On the down direction, host node adopts the mode of photosphere broadcasting that the downlink business signal is sent to from node, that is: the light that host node is sent is by the splitter demultiplexing, and every road connects one from node.It also is similar adding time-multiplexed situation in wavelength-division, and different is that a plurality of wavelength are arranged on the down direction.To each downstream wavelength, host node adopts continuous mode to send data, reaches beam split again behind the splitter, realizes photosphere broadcasting.Wherein, carried in the continuous light signal of downlink business signal and also comprised the upstream bandwidth map; This upstream bandwidth map is used to comprise to be distributed to from information such as the light of node burst serial number of channels and quantity;

On the up direction, from the node to the host node, adopt OB (burst of Optical Burst light) passage to connect.From the upstream bandwidth map that node sends according to host node, distribute to respectively from quantity and the sequence number of the OBU of node, with the uplink service signal adaptation behind the different OBU, carry out photoelectricity and transform, send burst luminous signal with burst mode, the process mixer is sent into the host node reception after closing the road.And add in the situation of wavelength division multiplexing in time division multiplexing, also be to adopt different OB passages to send data from node according to assigned wavelength.After sending optical burst signal and close the road from node, close ripple through wave multiplexer again and handle, send into host node through mixer.This shows that wavelength-division adds time-multiplexed situation, in fact can be regarded as the stack of a plurality of time-multiplexed system, can distinguish different time division multiplex systems by wavelength.Therefore main below is structure function and the master and slave data between nodes transmission course that example describes master and slave node with time-multiplexed scene.

In the network system of the embodiment of the invention, adopt the OB passage to connect on the up direction between the master and slave node, thereby guarantee light burst position relative fixed.When certain when the bandwidth of node is adjusted, other light burst position from node does not change as far as possible, the shake of business clock is less.Avoided because adjustment from node bandwidth causes other the clock jitter that causes from the variation of node burst position.Simultaneously, from the light burst position relative fixed of node, when multi-wavelength light amplified, the optical power change in the optical fiber was more regular, control easily, and can control signal be set in advance according to OB frame head and OB length information, realize that the burst of multi-wavelength is amplified; When receiving, burst receiver is more prone to lock input power in leading time at burst, the situation of long period adjustment can not appear continuing in optical burst signal power, receiver is more prone to correct reception, reduce no code check, thereby convenient star and the tree system that realizes farther distance and higher rate helps also supporting that the application form of WDM+TDM PON meets the application demand of long distance, big bandwidth, high-transmission quality.

In another embodiment of the present invention, a kind of service data transmission method is disclosed.As shown in Figure 7, this method comprises:

S702, Section Point receive the continuous mode light signal that has carried downlink business signal and upstream bandwidth map that first node sends, and carry out opto-electronic conversion, obtain carrying the continuous mode signal of downlink business signal and upstream bandwidth map;

S704, Section Point extract from the continuous mode signal need be at the downlink business signal and the upstream bandwidth map of this node whereabouts;

S706, Section Point be according to the upstream bandwidth map, is fitted to the light burst unit OBU signal with the uplink service signal with from the uplink bandwidth request information of node;

S708, Section Point carry out the electric light conversion to light burst unit OBU, produce optical burst signal, send with burst mode; Wherein, optical burst signal length relative fixed.

Wherein, in star or tree network system, first node can be used as host node, and Section Point can be used as from node.

Particularly, extract the downlink business signal the payload from node from successive frame, and from the expense of successive frame, extract the upstream bandwidth map, according to obtaining distributing to respectively from the quantity and the sequence number of the light burst passage of node from the node identification of node in the upstream bandwidth map.Wherein, the downlink business signal can be the service bearer container of the dissimilar client's service signals of carrying, this service bearer container can be multiple encapsulation format, for example: can be ATM cell or the GEM frame that is packaged into by dissimilar client's service signals.Also need routing iinformation from node according to the downlink business signal, for example: the Port-ID among the GEM, port numbers etc. are filtered the downlink business signal, keep service bearer container that this should receive from node; Non-service bearer container that receives from node then abandons.

In one embodiment of the invention, the transport layer container can be one the elongated transport layer container of Length Indication field, at this and hereinafter referred to as TPU (Transmission Payload Unit, transmission Payload Unit).Please refer to Fig. 8, Fig. 8 is the frame format schematic diagram of TPU in the one embodiment of the invention.As shown in Figure 8, TPU is by head, expense and payload three parts.Wherein, head comprises Length Indication field and header check field.

In embodiments of the present invention, the bandwidth adjustment is a unit with the OB passage, but bandwidth request is then added up respectively according to TPU.According to the bandwidth information of collecting each TPU actual needs of distributing to this node, form uplink bandwidth request information from node, be carried at and send to host node among the TPU.

Alternatively, can calculate the quantity of the transmission Payload Unit TPU that needs according to the light burst unit OBU that distributes in the upstream bandwidth map; The uplink service signal adaptation in the payload section of TPU, and is carried uplink bandwidth request information in TPU; TPU is fitted to the payload section of the light burst unit OBU of distribution, generates light burst unit OBU.Wherein, in TPU, carry uplink bandwidth request information specifically can be in the expense of TPU, be carried at TPU in carry uplink bandwidth request information; Perhaps uplink bandwidth request information is fitted to the payload section of TPU, generates and be specifically designed to the TPU supervisory packet that transmits uplink bandwidth request information.

As previously mentioned, dissimilar client's service signals encapsulate through being packaged into the uplink service signal of ATM cell or GEM frame format after the processing of client's side.GEM divides (adopting Port ID identification, referring to the relevant criterion of GPON) according to different classs of business, under the general situation, according to port class of business is set.Correspondingly, TPU also divides dissimilar according to class of business.T-CONT type dividing condition among division of TPU type and the GPON is similar, referring to the relevant criterion of GPON.For example: be that the GEM frame is an example with the uplink service signal here, describe the process of uplink service signal adaptation in detail, (the adaptation procedure situation of the transport layer container of other type is similar) to OBU.Please refer to Fig. 9, Fig. 9 is the schematic diagram of uplink service signal adaptation to OBU.As shown in Figure 9, a plurality of GEM frames can be fitted among the TPU; A plurality of TPU can be fitted to the payload section of an OBU.

In above-mentioned adaptation procedure, because the length of OBU is fixed, each might distribute OBU more than 2 from node, these two OBU (OBU that can be called a cascade, below in order to narrate conveniently, still be called two OBU) might not adjacent, therefore elongated transmission container is encapsulated into the relatively-stationary physical layer container of length, need to solve the problem how elongated TPU crosses over the OBU border.Please refer to Figure 10, Figure 10 crosses over the schematic diagram on OBU border for TPU.As shown in figure 10, when certain has distributed two OBU from node, OBU1 and OBU3, and OBU1 and OBU3 are non-conterminous.When TPU2 can't be fitted in the payload section of OBU1 fully, in the time of must crossing over OBU1 and OBU3, the length that then can use the Length Indication field of TPU2 head to indicate the TPU2 among OBU1 and the OBU3.

Can find out thus, after the head of TPU increases Length Indication, can carry out completeness check, reduce error rate the container of crossing over the OBU border.In addition on the one hand, host node is calculating the upstream bandwidth map, when giving respectively from node distribution OBU, only need calculate quantity and the sequence number distributed to respectively from the OBU of node, need not to consider the length of TPU, and whether TPU cross over the problem on OBU border, thereby can be more convenient and flexible to carrying out allocated bandwidth from node.

Further, when TPU or T-CONT fit within the OBU payload section, exist under the situation of idle bytes, can use with byte and fill idle bytes as the fixed pattern of unit.Wherein, byte of padding quantity is by the length decision of the OBU and the transport layer container TPU of the distribution of upstream bandwidth map.When TPU can complete filling OBU payload section the time, do not need byte of padding; Otherwise need to use fixed pattern to fill idle bytes.

In the embodiment of the invention, select the fixed pattern byte to fill the idle bytes of OBU payload section,, can realize complete filling with respect to inserting the Idle frame; Secondly, avoided because the complexity that priority control that the TPU of a default sky causes and bandwidth are adjusted; The 3rd, TPU can cross over the border of OBU, but need not cross over the border of OB frame, has reduced the complexity that bandwidth is adjusted.

Further, can from the continuous mode signal, extract the uplink frame header, and, guarantee that the up frame head of different optical burst signals keeps aliging or fixed phase relationship according to the transmitting time of described uplink frame header control uplink burst light signal from node.

In another embodiment of the present invention, the transport layer container can be continued to use the T-CONT among the GPON, the service bearer container that is fitted to the uplink service signal of T-CONT still can be GEM, physical layer is still OB and (is called Burst in GPON, here in order to narrate conveniently, unified is OB), also in this case promptly, the OBU frame structure is the same with Burst frame structure among the GPON, and the hardware components in the GPON equipment can be continued to use like this; Up direction is that unit connects with the OB passage still, that is to say the interval relative fixed between the OB light burst length on the up direction.The uplink service signal adaptation is similar to detailed process and the TPU of OBU, is not giving unnecessary details at this.

Need to prove that owing to do not have the Length Indication field among the T-CONT, T-CONT is being fitted to the process of OBU from node, T-CONT can not cross over the border of OBU.Therefore, in this case, need to revise length and the positional information distributed to respectively from the T-CONT of node, thereby guarantee the length relative fixed of OB, T-CONT can just encapsulate into OBU payload section simultaneously, distributes to the border of not crossing over OBU from the T-CONT of node.About the detailed process of host node GPON computation bandwidth map in the back the handling process of host node described in detail, do not repeat them here.

Therefore, under the situation of compatible G-PON system, from node length and position according to the T-CONT that distributes from upstream bandwidth map acquisition basis from node according to node identification; The uplink service signal adaptation in the payload section of T-CONT, and is carried uplink bandwidth request information in T-CONT; T-CONT is fitted to the payload section of the light burst unit OBU of distribution, generates light burst unit OBU.

In uplink service signal adaptation process, fill when the bandwidth difference of uplink service signal and transport layer container mainly encapsulates among the T-CONT by GEM and fixedly fill in byte and solve.Be that the service bearer container of GEM is explained with the uplink service signal below.Please refer to Figure 11, Figure 11 is fitted to the schematic diagram of OBU for the GEM frame.As shown in figure 11, when GEM is fitted to the T-CONT that the upstream bandwidth map distributes, when having idle bytes, can eliminate bandwidth difference at the byte of padding that the payload section of T-CONT is filled fixed pattern.

In the embodiment of the invention, the transport layer container adopts the T-CONT among the GPON, the service bearer container is GEM, and transmission container is continued to use the T-CONT among the GPON, and the physical layer container is that Optical Burst (is called Burst in GPON, here in order to narrate conveniently, unified be OB, also in this case promptly, the OBU frame structure is the same with Burst frame structure among the GPON), hardware components in the equipment can be continued to use with compatible existing GPON equipment better like this, can realize smooth upgrade easily.

An alternative embodiment of the invention provides a kind of network equipment, can be used as in the aforementioned network system from node.The structural representation of a kind of network equipment that Figure 12 provides for the embodiment of the invention.As shown in figure 12, this network equipment comprises: continuous mode optical receiver 121, descending adaptation module 122, up adaptation module 123 and the burst mode transmitter 124 separated.

On down direction, continuous mode optical receiver 121 receives the continuous mode light signal that has carried the downlink business signal, carries out opto-electronic conversion, obtains carrying the continuous mode signal of downlink business signal; The descending adaptation module 122 of separating extracts Overhead and payload from successive frame, obtains the downlink business signal.Wherein, downlink business signal in the payload can be the service bearer container of the dissimilar client's service signals of carrying, this service bearer container can be multiple encapsulation format, for example: can be ATM cell or the GEM frame that is packaged into by dissimilar client's service signals.Comprise upstream bandwidth cartographic information and other Overhead in the Overhead that extracts, for example: control and management information etc.The upstream bandwidth map comprises to be distributed to from the sequence number of the OBU of node and length and the positional information of quantity or T-CONT, the descending adaptation module 122 of separating also needs according to routing iinformation, for example: the address information (Port-ID among the GEM that generally all comprises in the service bearer container, port numbers etc.) the downlink business signal is filtered, keep the downlink business signal that this should receive from node, non-downlink business signal that receives from node then is dropped.

On the up direction, up adaptation module 123 is according to the upstream bandwidth map, with the uplink service signal adaptation in the transport layer container, and in the transport layer container, carry uplink bandwidth request information (as previously mentioned, uplink bandwidth request information is optionally in the transport layer container, is not all to have uplink bandwidth request information in each transport layer container.Certainly, also can be set to each transport layer container all carries.)。And then the transport layer container is fitted among the light burst unit OBU.124 pairs of light bursts of burst mode transmitter unit carries out the electric light conversion, produces optical burst signal, sends with burst mode.

Further, this network equipment also comprises up client's service signal processing module 125 and upstream bandwidth monitor 126.When various dissimilar up client's service signal access network device, up client's service signal processing module 125 is at first carried out processing such as Performance Detection and forwarding to the up client's service signal that inserts, also need detect the flow of up client's service signal according to type of service, and convert flow information to bandwidth request information, send to upstream bandwidth monitor 126; Upstream bandwidth monitor 126 changes into uplink bandwidth request information with the flow information that receives and sends to up adaptation module 123.

Wherein, the flow that detects up client's service signal specifically can adopt corresponding Buffer (buffer) degree of depth that detects different kinds of business to wait to realize.The degree of depth of Buffer depends primarily on two aspects, and the one, the bandwidth of up client's service signal has determined the inlet flow rate of Buffer; The 2nd, the upstream bandwidth that distributes in the upstream bandwidth map, this determines the rate of discharge of Buffer, can determine the degree of depth of Buffer by both differences.

That in another embodiment of the present invention, the transport layer container adopts is TPU.Correspondingly, uplink service signal adaptation module 123 specifically comprises: upstream bandwidth information conversion unit 1231, TPU adaptation module 1232, physical layer container adaptation module 1233.As shown in figure 12, upstream bandwidth information conversion unit 1231 calculates quantity and the length of transmission Payload Unit TPU according to the quantity of the light burst unit OBU of upstream bandwidth map distribution; In the payload field of the transmission Payload Unit TPU that TPU adaptation module 1232 is determined the uplink service signal adaptation to upstream bandwidth information translation unit 1231, uplink bandwidth request information is carried in the expense of transmission Payload Unit TPU, perhaps uplink bandwidth request information is fitted in the payload section of transport layer container, generate supervisory packet, that is: be specifically designed to transmission uplink bandwidth request transmission of Information layer container; Physical layer container adaptation module 1233 will be transmitted the payload section that Payload Unit is fitted to the light burst unit OBU of upstream bandwidth map distribution.

Further, 123 of up adaptive moulds further comprise fixed byte filler cells 1234.Be fitted to the payload section of light burst unit OBU as TPU after, when also there is idle bytes in the payload section of OBU, uses with byte and fill institute's idle bytes as the fixed pattern byte of unit.

In another embodiment of the present invention, for the existing GPON equipment of compatibility, the transport layer container adopts the T-CONT among the G-PON.Because the transport layer container has adopted T-CONT in the present embodiment, different among the concrete structure of up adaptation module and Figure 12, the functional structure of other module is basic identical, therefore this only emphasis describe and on difference among the embodiment, other repeats no more.

Please refer to Figure 13, the network equipment structural representation of a kind of compatible G-PON of providing in the embodiment of the invention is provided Figure 13.As shown in figure 13, up adaptation module 133 specifically comprises: upstream bandwidth information conversion unit 1331, T-CONT adaptation module 1332, physical layer container adaptation module 1333.Upstream bandwidth information conversion unit 13315 obtains length and the positional information of the T-CONT of distribution from the upstream bandwidth map; Among the T-CONT that T-CONT adaptation module 1332 is determined the uplink service signal adaptation to upstream bandwidth information translation unit 1331, also uplink bandwidth request information can be carried among the T-CONT; Physical layer container adaptation module 1333 is fitted to T-CONT the payload section of the light burst unit OBU of upstream bandwidth map distribution.

Further, 133 of up adaptive moulds further comprise fixed byte filler cells 1334.When GEM was fitted to T-CONT that the upstream bandwidth map distributes and has idle bytes, fixed byte filler cells 1334 can be eliminated bandwidth difference at the byte of padding that the payload section of T-CONT is filled fixed pattern.

Contents such as concrete signal processing, implementation between the said apparatus module and since with the inventive method embodiment based on same conception, can repeat no more referring to the specific descriptions of the inventive method embodiment herein.

In another embodiment of the present invention, a kind of data transmission method is disclosed.Figure 14 is the schematic flow sheet of a kind of data transmission method in the embodiment of the invention.As shown in figure 14, this method comprises:

S142, first node receive the optical burst signal that Section Point sends, and convert described optical burst signal to corresponding signal of telecommunication light burst unit OBU; Wherein, the length relative fixed of described optical burst signal;

S144, described first node separate the adaptive uplink service signal that goes out from described light burst unit OBU, and extract the uplink bandwidth request information of Section Point from described OBU;

S146, described first node calculate according to the upstream bandwidth calculating parameter that comprises described uplink bandwidth request information and obtain the upstream bandwidth map;

S148, described first node are fitted to downlink business signal and described upstream bandwidth map in the continuous mode signal; Host node carries out the electric light conversion to the continuous mode Frame, and sends with the continuous mode light signal.

First node can be used as host node in star or tree network system; Section Point can be used as from node in this network system.

In said process, be channel attached between the master and slave node of up direction by OB, this need encapsulate elongated transmission container the into physical layer container of relative fixed length.That therefore in one embodiment of the invention, the transport layer container adopts is the TPU with Length Indication field.

Correspondingly, step S144 specifically comprises: host node is separated the adaptive Payload Unit TPU that goes out to transmit from light burst unit OBU; Host node is separated adaptive go out uplink service signal and/or uplink bandwidth request information from transmission Payload Unit TPU.

Step S146 specifically comprises: host node is according to respectively from the service priority of the uplink bandwidth request information of node, available up total bandwidth, transport layer container, calculates OBU quantity and the sequence number distributed to respectively from node.

During concrete calculating, need be comprehensive from the bandwidth request information of node, from node traffic priority and the actual OBU quantity that can distribute, calculate the OBU quantity that each should distribute from node.Allocation method of bandwidth can not repeat them here with reference to the DBA algorithm in the PON system.Different with the DBA algorithm in the PON system is that calculative in the embodiment of the invention is to distribute to each OBU quantity from node, therefore, must revise the bandwidth of using in the DBA algorithm.At first, need to deduct interval between the OBU in the up total bandwidth; Secondly, each is not continuous from the distributable bandwidth that node distributes, but the integral multiple of the bandwidth of an OBU that is: need carry out rounding operation through the bandwidth value that similar DBA algorithm draws.By these corrections, the upstream bandwidth manager can calculate OBU quantity, needs to indicate the sequence number of each OBU that should distribute from node simultaneously, finally exports the upstream bandwidth map, and is carried in the expense of descending successive frame and sends to from node.

Please refer to Figure 15, Figure 15 is the schematic diagram of upstream bandwidth map, as shown in figure 15, carried each node ID in the upstream bandwidth map from node, and distribute to each quantity and sequence number from the OBU of node, thereby after being convenient to receive the upstream bandwidth map, know quantity and the sequence number of the OBU that this node distributes, and carry out the adaptation processing of uplink service signal in view of the above according to node ID from node.

In the embodiment of the invention, the transport layer container adopts TPU.The position of OBU relative fixed in uplink frame can simplified design, and host node does not need to spell out the particular location of each TPU.After node was received the upstream bandwidth map, the bandwidth according to the OB number of channels, TPU kind and the application that distribute calculated byte of padding quantity among each TPU length and the OB.Carry out the adaptive of uplink service signal from node according to these information, finally finish the bandwidth adjustment.

In the past in the face of from the composition structure of node and functional description as can be known, the transport layer container is except adopting TPU, mode that can also compatible existing GPON system adopts T-CONT as transmission container.When transmission container adopts T-CONT, calculate the upstream bandwidth map and distribute the process of bandwidth slightly different, will be the situation of T-CONT with regard to the transport layer container below, be elaborated.

When adopting T-CONT as transmission container, still the bandwidth map under the existing GPON system of OB passage assignment unit output, that is: need the position of the byte that each T-CONT of indication begins and finish, make length and the blank character assembly system Configuration Values of OBU when making it to encapsulate OBU into, promptly guarantee OB length and relative fixed at interval.

At first will calculate the initial T-CONT that each distributes from node, there are several possibilities again in relation between the OB number of channels payload section length (being called the OBU total bandwidth) of initial T-CONT length and actual allocated.

A) from a plurality of initial T-CONT length of node correspondence be no more than an OBU total bandwidth.This moment, host node can adopt multiple mode to adjust T-CONT length, made and should can just encapsulate into OBU payload section to deserved a plurality of T-CONT from node.The T-CONT length or all kinds of T-CONT that specifically can only increase the transport service correspondence of doing the best proportionally increase length, or the like.It should be noted that, in the time of encapsulate into T-CONT from the node traffic carrying container, if it is unnecessary that the T-CONT bandwidth has, in GPON, will fill and fixedly fill in byte, therefore increase the mode of T-CONT length, can adjust the GEM adaptation procedure voluntarily from node among the GPON according to the existing standard design, need not to change hardware;

B) from a plurality of initial T-CONT length of node correspondence with above an OBU total bandwidth.At this moment, if do not adjust, the situation that just may exist T-CONT to cross over the OBU border is unsupported in the design of GPON system at present still.Need host node to give from the several T-CONT of node overabsorption (having several T-CONT need cross over the OBU border just distributes several) this moment, and the T-CONT that needs is crossed over the OBU border is divided into two.

In actual the enforcement, can use said method to determine actual allocated T-CONT in the upstream bandwidth map.Figure 16 is for determining the schematic diagram of the T-CONT quantity of actual allocated according to the T-CONT of initial calculation.As shown in figure 16, certain has distributed two OBU, OBU1 and OBU3 from node, then T-CONT be fitted to OBU situation as shown in figure 16: the T-CONT2 that initial calculation is distributed need cross over the OBU border, when therefore adjusting, T-CONT2 is divided into T-CONT2 and TC-ONT4, has promptly increased a T-CONT4 newly.In addition, after T-CONT3 encapsulated into the OBU payload section, the OBU payload section also had unnecessary byte, therefore T-CONT3 was extended.

By above-mentioned several modes, host node guarantees that by the length of calculating and distribution T-CONT T-CONT can be encapsulated among the OBU, thereby guaranteed the length of light burst OB and relative fixed at interval,, helped burst more and receive and amplify with respect to existing G-PON system.

As can be seen from the above, the transport layer container adopts under TPU and two kinds of situations of compatible GPON system, difference in the upstream bandwidth map calculation process: when the transport layer container adopts TPU, host node only need calculate quantity and the sequence number of OBU, transmission container TPU is fitted among the OBU and can finishes from node, adopt when TPU encapsulates into OBU fixedly adaptive both the bandwidth differences of byte of padding (certain, also can in host node, calculate the information such as length, quantity and position of TPU; Under this situation, the downlink bandwidth map just and GPON similar); Adopt in the method for compatible GPON system, host node need calculate length and the original position of transmission container T-CONT, and guarantees to distribute to respectively from the T-CONT of node and do not cross over OBU's; Correspondingly, adopt when the professional carrying container of the adaptive encapsulation of node is to transmission container T-CONT fixedly the mode of byte of padding to adjust bandwidth difference.

In one embodiment of the invention, when host node calculates distribution respectively when the OB number of channels of node changes, when needing to adjust from OB passage that node distributes, fixing as far as possible in order to guarantee from the OB channel position of node, concrete method of adjustment is as follows:

Inspect all from node, the shared OB gap marker of node that does not need to adjust the OB number of channels is " can not adjust ", current unappropriated OB gap marker is " free time ", and other OB gap marker is " can adjust ";

Inspect all need adjust the OB number of channels from node, if when node need reduce the OB number of channels, keep the less OB passage of sequence number, it is designated " can not adjust "; Discharge the bigger OB passage of sequence number, it is designated " free time ";

Order is inspected the OB passage that remaining all are designated " can adjust ", if containing high-priority service of its correspondence from node, for example: the more sensitive business of delay variation (can discern) by the priority of transport layer container, the then preferential OB passage that arrangement increases newly after original OB passage can be adjusted node in case of necessity and only contain the lower adjustable OB channel position of the grade of service;

Order is inspected the OB passage that remaining all are designated " can adjust ", the OB passage of the free time that the priority allocation sequence number is less.

By above-mentioned adjustment process, can preferentially guarantee the bandwidth demand from node of high-priority service, and keep not needing to adjust the invariant position from the OB passage that node distributed of OB number of channels, thereby maximum possible keeps the fixed-site of OB passage, be convenient to burst amplification and reception.

An alternative embodiment of the invention provides a kind of network equipment, can be used as the host node in the aforementioned network system.The structural representation of a kind of network equipment that Figure 17 provides for the embodiment of the invention.As shown in figure 17, this network equipment comprises: burst mode optical receiver 171, up adaptation module 172, upstream bandwidth manager 173, descending adaptation module 174 and the continuous mode optical transmitter 175 separated.

On the up direction, burst mode optical receiver 171 receives the OB optical burst signal, carries out opto-electronic conversion, and carries out the processing such as demarcation of power blockage, timing and the OB of physical layer; Signal of telecommunication OB after will handling then issues the up adaptation module 172 of separating; The up adaptation module 172 of separating is separated the adaptive uplink service signal that goes out from OBU, and extracts uplink bandwidth request information; Upstream bandwidth manager 173 goes out the upstream bandwidth map according to upstream bandwidth map calculation calculation of parameter; The upstream bandwidth map comprises light burst serial number of channels and the quantity of distributing to from node.

On the down direction, descending adaptation module 174 will have been carried the payload section of downlink business signal adaptation to the continuous mode Frame, and carry other management and control information of upstream bandwidth map and some in the expense of continuous mode Frame; The Frame of 175 pairs of continuous modes of continuous mode optical transmitter carries out the electric light conversion, and sends with the continuous mode light signal.Wherein, the Frame of the continuous mode of down direction can adopt the downlink frame of GPON or the frame structure of other continuous mode, and the embodiment of the invention is not done qualification at this.

In another embodiment of the present invention, the transport layer container can adopt TPU, and the then up adaptation module 172 of separating comprises that specifically the physical layer container is separated adaptation module 1721 and TPU separates adaptation module 1722.Wherein, the physical layer container is separated adaptation module 1721 and separate the adaptive TPU of going out from OBU; TPU separates adaptation module 1722 and separate the adaptive uplink service signal that goes out from TPU, and extracts respectively uplink bandwidth request information from node from TPU.

In the present embodiment, the transport layer container is elongated TPU, and can cross over the border of OBU, therefore only need calculate quantity and the sequence number of distributing to from the OBU of node.Correspondingly, upstream bandwidth manager 173 comprises: allocated bandwidth unit 1731 and OBU sequence number determining unit 1732.As shown in figure 17, allocated bandwidth unit 1731 calculates each quantity from the OBU of node distribution according to uplink bandwidth request information, whole network availability bandwidth and each service priority from node.Allocation method of bandwidth can not repeat them here with reference to the DBA algorithm in the PON system.Different with the DBA algorithm in the PON system is, in the embodiment of the invention allocated bandwidth unit calculative be to distribute to each OBU quantity from node, therefore, the upstream bandwidth manager must be revised the bandwidth of using in the DBA algorithm.At first, need to deduct interval between the OBU in the up total bandwidth; Secondly, each is not continuous from the distributable bandwidth that node distributes, but the integral multiple of the bandwidth of an OBU that is: need carry out rounding operation through the bandwidth value that similar DBA algorithm draws.Revise by these, OBU sequence number determining unit 1732 obtains distributing to each sequence number from the OBU of node.

This network equipment further comprises up frame head processing module 178.Up frame head processing module 178 is mainly adjusted the autonomous system's frame head that produces of host node, forms the up frame head of system.Wherein, downstream signal adaptation module 174 can (may be one group of information with the uplink frame header by the management information field, for example, host node is according to the range finding result, calculate the numerical value that each should be revised from node, thereby make the uplink frame hair of setting according to host node from node send data) deliver to each from node, each is benchmark from node with the up frame head of host node appointment, carry out the transmission of OB, thereby the frame head that guarantees the different OB frames that send from node is phase relation alignment or that be maintained fixed.Add in the wavelength-division multiplex system in time division multiplexing, the uplink frame frame head of each wavelength correspondence needs alignment, by system frame head carry out frame head alignment between the different up frame head processing module this moment, with guarantee upgoing O B frame frame head on each different wave length that sends from node be alignment or guarantee fixed phase relation.

This network equipment further comprises client's side business processing module 176 and downlink bandwidth manager 177.Wherein, the flow information of client's side business processing module 176 and all kinds of descending client's service signal of the down direction that extracts also converts bandwidth information to, sends to downlink bandwidth manager 177; Correspondingly, descending adaptation module 174 also sends to downlink bandwidth manager 177 with current available downstream bandwidth information, downlink bandwidth manager 177 is according to the kind of both and descending client's service signal, calculate each bandwidth of distributing on the down direction from node, client's side business processing module 176 and descending adaptation module 174 are distributed to respectively from the bandwidth of node according to the downlink bandwidth manager, finish the processing procedure that descending client's service signal is fitted to the service bearer container and the service bearer container is fitted to successive frame.

Specifically, client's side business processing module can adopt modes such as detecting the Buffer degree of depth to obtain the flow information of descending client's service signal, and the Buffer degree of depth just depends on the difference of the downlink bandwidth of client's side business signaling traffic and permission.According to the situation of the Buffer degree of depth, just know whether both are adaptive, whether need to adjust, give the downlink bandwidth manager thereby form the downlink bandwidth solicited message.Downlink bandwidth manager 177 calculates downlink bandwidth according to new bandwidth information etc. again, thereby can continue adjustment, dynamically satisfies the downlink bandwidth demand.The mode that the down direction bandwidth is adjusted among this part and the GPON is similar, does not repeat them here.

In one embodiment of the invention, for the existing G-PON system of compatibility, the transport layer container still can adopt the T-CONT of variable length among the G-PON, and can not cross over the border of OBU.Please refer to Figure 18, the structural representation of the network equipment of a kind of compatible G-PON that Figure 18 provides for the embodiment of the invention.As shown in figure 18, because the transport layer container has adopted T-CONT in the present embodiment, different among the up concrete structure of separating adaptation module and upstream bandwidth manager and Figure 17, the functional structure of other module is basic identical, therefore this only emphasis describe with on difference among the embodiment, other repeats no more.

As shown in figure 18, except the OBU quantity and sequence number thereof of distributing, also need to calculate length and the original position of T-CONT in the upstream bandwidth map of upstream bandwidth manager 183 outputs.Therefore, upstream bandwidth manager 183 further comprises: initial calculation unit 1833 and T-CONT determining unit 1834.Wherein, initial calculation unit 1733 calculates respectively from the T-CONT length of the original allocation of node according to distributing to respectively from the OBU quantity of node; T-CONT determining unit 1734 is determined T-CONT length and position in the upstream bandwidth map.

Contrast the situation among the TDM+WDM PON, can learn that the light burst is a regular distribution in the embodiment of the invention, the position is relatively-stationary, light is put for happening suddenly, the input light optical power envelope of the input light of a plurality of wavelength and single wavelength is similar, multi-wavelength control just and single wavelength control are similar, thereby the burst of easier realization multi-wavelength is amplified, evaded between the wavelength different when bandwidth is adjusted among the TDM+WDM PON interacting, caused effectively to carry out the problem that multi-wavelength amplifies.

It is a kind of by an above-mentioned host node and at least one network system of forming from node that another embodiment of the present invention also provides, and this network system can be star or tree-like network.Form transfer of data between the structure of master and slave node of this network system and the master and slave node, mutual method and describe in detail among in front the embodiment, do not repeat them here.

Owing to converge in the metropolitan area/there is a large amount of dual-homed annular networkings in Access Layer, above-mentionedly can expand to dual-homed annular networking star or tree-like application.As shown in figure 19, in dual-homed looped network, there are two host node S1 and S2, a plurality of from node N1～N? between do not have transfer of data, they only and between the host node have transfer of data.For this application, can be with the equivalence of dual-homed ring for being the star/tree-like networking of host node with S1 and being the star/tree-like networking of host node with S2, therefore, be in the dual-homed loop network of host node with S1 or with S2, can adopt the structure and the data transmission method of the master and slave node in above-mentioned star or the tree network equally, that is: descending employing continuous mode transmission data send to data from node by photosphere broadcasting; Up employing burst mode transfer data connect from adopting the OB passage between node and the host node.In the practical application, generally connect by two optical fiber between the node of dual-homed looped network, the corresponding transmission direction of optical fiber can be passed through wavelength division in optical fiber, realize the descending and S2 upstream data common optical fiber of S1; Correspondingly, the up S2 downlink data of S1 common optical fiber.

Please refer to Figure 20, Figure 20 is the schematic diagram of master and slave node in the dual-homed loop network.As shown in figure 20, host node (S node) up direction and down direction signal adopt the optical fiber of different directions to transmit respectively, and a host node can be supported a plurality of stars/tree network stack.For example, have m on the ring from node, host node and 1～m1 are individual from employing transmitter 1 and receiver 1 between the node, and m1+1～m2 is individual from employing transmitter 2 and receiver 2 between the node, or the like.In the input optical fibre direction, at first adopt channel-splitting filter separately from node, on assigned wavelength, adopt splitter to take out downstream signal then, deliver to downlink receiver a plurality of wavelength in the optical fiber.Secondly, the upward signal that upstream transmitter sends is incorporated in the respective wavelength by a mixer, closes into through a wave multiplexer then and exports in the optical fiber.Between node support and two host nodes, transmit data.In dual-homed looped network, adopt the mode of above-mentioned star/tree-like stack, can simplify the method for range finding.Interior ring direction with N1 node and N2 node is an example, the descending frame head of N1 to the up frame head of S2 locking S1 to N1, and promptly the descending frame head of N1 to the up frame head of S2 and S1 to N1 is maintained fixed phase relation; The descending frame head of same N2 to the up frame head locking of S2 S1 to N2.Like this, in this manner, the burst that N1 and N2 are dealt into S2 just arrives S2 according to same benchmark, can not clash.The situation of outer shroud direction also is similar.Can find out thus, in this embodiment, by lock one from node respectively with two host nodes the phase relation of uplink and downlink frame head, can avoid effectively conflict occurring from the burst of the light between the node, simplified the method for range finding.Device embodiment described above only is schematically, and wherein the unit as the separating component explanation can or can not be physically to separate also, promptly can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select wherein some or all of module to realize the purpose of present embodiment scheme according to the actual needs.Those of ordinary skills promptly can understand and implement under the situation of not paying performing creative labour.

Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement, but the former is better execution mode under a lot of situation by hardware.Based on such understanding, all or part of can the embodying that technical scheme of the present invention contributes to background technology with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the method for some part of each embodiment of the present invention or embodiment.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. a data transmission method is characterized in that, this method comprises:

2. the method for claim 1, it is characterized in that, described first node is separated the adaptive uplink service signal that goes out from described light burst unit OBU, and the step that extracts the uplink bandwidth request information of described Section Point from described light burst unit OBU specifically comprises:

Described first node is separated the adaptive Payload Unit TPU that goes out to transmit from described light burst unit OBU;

Described first node is separated adaptive go out uplink service signal and uplink bandwidth request information from described transmission Payload Unit TPU.

3. the method for claim 1, it is characterized in that, described first node is separated the adaptive uplink service signal that goes out from described light burst cell signal OBU, and the step that extracts the uplink bandwidth request information of described Section Point from described light burst unit OBU specifically comprises:

Described first node is separated the adaptive T-CONT of going out from described light burst unit OBU;

Described first node is separated the adaptive uplink service signal that goes out from described T-CONT, and extracts uplink bandwidth request information from described T-CONT.

4. method as claimed in claim 2 is characterized in that, described first node calculates the step that obtains the upstream bandwidth map according to the upstream bandwidth calculating parameter that comprises described uplink bandwidth request information and specifically comprises:

Described first node calculates OBU quantity and the sequence number of distributing to respectively from node according to the service priority of the uplink bandwidth request information of described Section Point, available up total bandwidth, described TPU.

5. method as claimed in claim 3 is characterized in that, described first node calculates the step that obtains the upstream bandwidth map according to the upstream bandwidth calculating parameter that comprises described uplink bandwidth request information and specifically comprises:

Described first node calculates the OBU quantity and the sequence number of distribution according to the service priority of described uplink bandwidth request information, available up total bandwidth, described T-CONT;

Calculate respectively from the T-CONT length of the original allocation of node according to the OBU quantity of described distribution;

Determine the T-CONT quantity and initial, the end position that distribute in the described upstream bandwidth map.

6. method according to claim 5 is characterized in that, described first node guarantees the optical burst signal length relative fixed of up direction by adjusting T-CONT length and/or quantity.

7. as claim 4 or 5 described methods, it is characterized in that, further comprise:

When described first node calculates the OBU quantity of distribution and sequence number and changes,

Not need to keep adjusting the invariant position of the OB passage that Section Point distributed of OB number of channels.

8. method as claimed in claim 7 is characterized in that, further comprises:

For the high-priority service bandwidth demand, increase idle OB passage, and/or take the adjusted OB passage that low priority traffice takies.

9. the method for claim 1 is characterized in that, further comprises:

Described first node produces up frame head according to system's frame head, and carries described uplink frame header in described continuous mode signal.

10. a data transmission method is characterized in that, this method comprises:

11. method as claimed in claim 10 is characterized in that, described Section Point extracts from described continuous mode signal and need specifically comprise at downlink business signal and the upstream bandwidth map that this node falls:

Described Section Point extracts the downlink business signal from the payload of described continuous mode signal, according to the routing iinformation of described downlink business signal described downlink business signal is filtered, and extracting need be at the downlink business signal on this underground road;

Described Section Point extracts described upstream bandwidth map from described continuous mode signal, extract quantity and the sequence number of the light burst unit OBU that distributes to this node from described upstream bandwidth map;

Correspondingly, described Section Point is according to described upstream bandwidth map, specifically comprises with the uplink service signal and/or from the step that the uplink bandwidth request information of node is fitted to the light burst unit OBU:

According to the light burst unit OBU that distributes in the described upstream bandwidth map, calculate quantity and/or the length of the transmission Payload Unit TPU that needs;

Described uplink service signal and/or described uplink bandwidth request information are fitted among the described TPU;

Described TPU is fitted to the payload section of the light burst unit OBU of described distribution, generates light burst unit OBU.

12. method as claimed in claim 10 is characterized in that, described Section Point extracts from described continuous mode signal and need specifically comprise at downlink business signal and the upstream bandwidth map that this node falls:

Described described upstream bandwidth map, acquisition distributes from described bandwidth map T-CONT length and initial, the end position of extracting the expense from described continuous mode signal from node; Correspondingly,

Described Section Point is according to described upstream bandwidth map, specifically comprises with the uplink service signal and/or from the step that the uplink bandwidth request information of node is fitted to the light burst unit OBU:

Described uplink service signal and/or described uplink bandwidth request information are fitted among the described T-CONT;

Described T-CONT is fitted among the light burst unit OBU of described distribution, generates light burst unit OBU.

13. method as claimed in claim 11 is characterized in that, further comprises:

Be fitted to the payload section of light burst unit OBU as described TPU after, when also there is idle bytes in the payload section of described light burst unit OBU, use the fixed pattern byte to fill described idle bytes.

14. as each described method in the claim 9 to 13, it is characterized in that, further comprise:

Described Section Point extracts the uplink frame header from described continuous mode signal, and according to the transmitting time of described uplink frame header control uplink burst light signal, guarantees that the up frame head of different optical burst signals keeps aliging or fixed phase relationship.

15. a network equipment is characterized in that, comprising:

16. the equipment of network as claimed in claim 15 is characterized in that, described up adaptation module specifically comprises:

Upstream bandwidth information translation module, the quantity that is used for the light burst unit OBU that distributes according to described upstream bandwidth map calculates quantity and the length of transmission Payload Unit TPU;

The TPU adaptation module is used for the payload section of uplink service signal adaptation to the definite transmission Payload Unit TPU of described upstream bandwidth information translation module, and described uplink bandwidth request information is carried among the described transmission Payload Unit TPU;

Physical layer container adaptation module is fitted to described transmission Payload Unit TPU after adaptive the payload section of the light burst unit OBU that described upstream bandwidth map distributes.

17. the equipment of network as claimed in claim 15 is characterized in that, described up adaptation module specifically comprises:

Upstream bandwidth information translation module is used for from quantity, length and the positional information of the T-CONT of described upstream bandwidth map acquisition distribution;

The T-CONT adaptation module is used for uplink service signal and uplink bandwidth request information are fitted to the T-CONT that described upstream bandwidth information translation module is determined;

Physical layer container adaptation module is fitted to described T-CONT among the described light burst unit OBU.

18. the network equipment as claimed in claim 16 is characterized in that, described adaptation module further comprises:

Filler cells is used for after described TPU is fitted to the payload section of light burst unit OBU, when also there is idle bytes in the payload section of described light burst unit OBU, uses fixed pattern to fill institute's idle bytes.

19. as the claim 16 or the 17 described network equipments, it is characterized in that, further comprise:

Up client's service signal processing module is used for up client's service signal is encapsulated into the service bearer container, generates the uplink service signal;

The upstream bandwidth monitoring means is used to monitor the flow of described up client's service signal, and converts described flow information to uplink bandwidth request information.

20. a network equipment is characterized in that, comprising:

21. the network equipment as claimed in claim 20 is characterized in that, the described up adaptation module of separating specifically comprises:

The physical layer container is separated adaptation module, is used for separating the adaptive transport layer Payload Unit TPU of going out from described light burst unit (OBU);

TPU separates adaptation module, is used for separating the adaptive uplink service signal that goes out from the transport layer Payload Unit, and extracts uplink bandwidth request information.

22. the network equipment as claimed in claim 20 is characterized in that, described upward signal is separated adaptation module and is specifically comprised:

The physical layer container is separated adaptation module, is used for separating the adaptive T-CONT that goes out to carry the uplink service signal from described light burst unit OBU;

T-CONT separates adaptation module, is used for separating adaptively to go out the uplink service signal and extract uplink bandwidth request information from described T-CONT from described T-CONT.

23. the network equipment as claimed in claim 21 is characterized in that, described upstream bandwidth manager specifically comprises:

The allocated bandwidth unit is used for calculating each quantity from light burst unit OBU of node distribution according to the service priority of uplink bandwidth request information, available up total bandwidth, described transport layer container;

Light burst unit number determining unit is used for determining described each sequence number from light burst unit OBU of node distribution.

24. the network equipment as claimed in claim 22 is characterized in that, described upstream bandwidth manager specifically comprises:

The allocated bandwidth unit is used for calculating each quantity from light burst unit OBU of node distribution according to the service priority of uplink bandwidth request information, available up total bandwidth, described transport layer container.；

The initial calculation unit calculates respectively from the T-CONT length of the original allocation of node according to described distributing to respectively from the OBU quantity of node.

The T-CONT determining unit is used for T-CONT length and the position of determining that described upstream bandwidth map distributes.

25. the network equipment as claimed in claim 21 is characterized in that, further comprises:

Up frame head processing module is used for producing up frame head according to system's frame head; Correspondingly,

Described downstream signal adaptation module also is used for carrying described uplink frame header at described continuous mode signal.

26. a network system is characterized in that, comprises a first node, at least one Section Point; Wherein:

27. a network system, comprise the network equipment as claimed in claim 20 as first host node and second host node and at least one network equipment as claimed in claim 15 as from node;

28. system as claimed in claim 27 is characterized in that:

The up frame head of the described optical burst signal that sends to described first host node from node and described second host node keep alignment or fixed phase relationship to the descending frame head of the described continuous mode signal that sends from node.

29. system as claimed in claim 27 is characterized in that:

The up frame head of the described optical burst signal that sends to described second host node from node and described first host node keep alignment or fixed phase relationship to the descending frame head of the described continuous mode signal that sends from node.