CN101087238B - Dynamic bandwidth allocation device and method of passive optical network - Google Patents
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Abstract
The invention relates to optical communication field, discloses a collating device and method for dynamic bandwidth in source-free optical network, and the distribution method for dynamic bandwidth is transparent, which can satisfy the requirement for different service, improve the utilization rate of bandwidth, realize the fair distribution for bandwidth, good haleness, real time, and can distribute bandwidth for different port, and support to release offline bandwidth of ONU. The distributing device for dynamic bandwidth in source-free optical network includes ascending service active fibernetwork unit bit-mapping register, ascending service active port bit-mapping table, ascending virtual media accessing control sub-layer information table, descending virtual media accessing control sub-layer authorization information table; said distributing device for dynamic bandwidth, consults said fiber network unit active information, port active information and length information of sendingdata, according to preset priority of different service, process the service flow according to priority according to preset priority, and distributes the dynamic bandwidth for ports.
Description
Technical field
The present invention relates to optical communication field, particularly the dynamic bandwidth allocation apparatus of EPON and method.
Background technology
EPON (Passive Optical Network is called for short " PON ") is meant and does not contain any electronic device and electronic power supply in the optical distribution, all is made up of passive devices such as optical branching devices, does not need a kind of optical access network of valuable active electronic equipment.PON is as a kind of broadband access optical fiber technology of emerging last kilometer of covering, it does not need node device at optical branch point, only need that a simple optical branching device is installed and get final product, therefore have the cable resource of saving, bandwidth resources share, save machine room investment, device security height, networking speed soon, comprehensive networking low cost and other advantages.The low cost of PON has made its (Fiber To The Building that becomes that Fiber To The Building, be called for short " FTTB "), Fiber To The Curb (FiberTo The Curb, abbreviation " FTTC "), the optimal broadband access method of fiber-to-the-home front yard FTTx networks such as (Fiber To The Home are called for short " FTTH ").
PON is as the main type of present optical access network, mainly be divided into asynchronous transfer mode EPON (ATM Passive Optical Network, be called for short " APON ") and Ethernet passive optical network (Ethernet Passive Optical Network, be called for short " EPON "), be the principal and subordinate control structure of point to multiple spot, as shown in Figure 1, optical line terminal (Optical Line Terminal, be called for short " OLT ") be major node equipment, by optical branching device and a plurality of optical network unit (Optical Network Unit, be called for short " ONU ") link to each other, and carry out ONU and register, the outgoing data mandate, processing such as Media Access Control (MediaAccess Control sub layer is called for short " MAC ") interacting message; ONU is from passing node equipments, and response OLT finds message, reports outgoing data length, carries out the transmission of each port data according to authorization message, and hangs a plurality of user terminals down, supports multi-service parallel.Under this kind frame structure of optical access network, how the reasonable distribution bandwidth, effectively utilize Internet resources and satisfy business demand, become very important content in the PON MAC scheme.
In the optical access network, allocated bandwidth has dual mode: static bandwidth allocation (Static BandwidthAllocation is called for short " SBA ") and Dynamic Bandwidth Allocation (Dynamic Bandwidth Allocation is called for short " DBA ").The bandwidth of each ONU of static bandwidth allocation fixed allocation or its port can not seized with time slot, and bandwidth availability ratio is lower, and not strong from the professional adaptive faculty of likelihood to height burst rate.Dynamic bandwidth allocation algorithm is a kind ofly to carry out mechanism or the algorithm that quick bandwidth is heavily distributed based on active user's business demand, can improve the PON bandwidth availability ratio by dynamic adjustments bandwidth between ONU according to the requirement of ONU burst service.
Multiple distribution method of dynamic bandwidth is arranged at present, such as, with Davis branch school, University of California, the Glen Kramer of Alloptic employee of company is the main PON distribution method of dynamic bandwidth that is called periodic time self-adapting intersection repeating query (InterleavedPolling with Adaptive Cycle Time, abbreviation " IPACT ") that proposes; G.983.4 it is a kind of especially at the DBA agreement of APON etc. that the standard of ITU-T (International Telecommunication Union-Telecommunication Standardization Sector, be called for short " ITU-T ") proposes.
The main thought of the IPACT method of in U.S. Pat 6546014, describing be reach OLT from sending data to of last ONU before with regard to next ONU of repeating query to determine whether to authorize and authorize information such as amount.Describe some details of this method below with reference to Fig. 2, communicating by letter with three OUN with an OLT among the figure is that example is carried out method and described.Suppose certain polling cycle t0 zero hour, OLT has outgoing data length and loop propagation delay time (Round Trip Time is called for short " the RTT ") information of each ONU, and is stored in the polling list polling table (Polling Table).
Shown in (a) among Fig. 2, when OLT begins at polling cycle, send authorization message to ONU1, allow it to send 6000 bytes.After receiving authorization message, ONU sends data to be finished up to authorized window.When OLT sends data, ONU receives data from the user terminal of hanging down always, and does buffer memory.Sending the last of data, ONU produces next round outgoing data information, and reports.Among the figure 550 bytes.
Shown in (b) among Fig. 2, before the response of receiving previous ONU, OLT calculates the time of last bit arrival of previous ONU data: add the transmission data length that this ONU authorizes the time of advent of first bit (RTT of this ONU).So OLT just can be according to the RTT information of next ONU, send the authorization message of next ONU in the definite moment, make the data transmission window of former and later two ONU only differ a boundary belt.
Shown in (c) among Fig. 2, after the data of ONU1 were all received by OLT, OLT was according to the information in the subsidiary next round outgoing data information updating polling list polling table, as the reference data of next round polling cycle.For the renewal of RTT information, OLT is by obtaining the tracking of authorization message transmission and Data Receiving.
Shown in (d) among Fig. 2, OLT does same processing to ONU2, ONU3.
When data cached when being empty among certain ONU, the next round outgoing data that reports is changed to zero, and the window of Shou Quaning is zero like this, and ONU can apply for authorized window in the same old way in the outgoing data request that reports next time.
If OLT authorizes each ONU to send content in its all buffer memorys in a process of transmitting, then those ONU that data volume is big may monopolize whole bandwidth.For avoiding this point, OLT will limit maximum traffic volume.Each ONU will be authorized to send the data volume of its last periodic request, but be no more than predetermined maximum constraints, promptly maximum send window size.To the different set of data traffic volume maximum constraints, some different schemes will be produced.Such as fixing, based on service level agreement (ServiceLevel Agreement is called for short " SLA "), this scheme ignored request window size and always authorize maximum send window; Perhaps limited, its authorization requests byte number but be no more than maximum send window; Perhaps constant credit line (Constant Credit), it adds a constant credit line on the request window; Perhaps linear credit line (Linear Credit), its request add on the window one with the linearly proportional credit line of request window; Perhaps flexible, it attempts to remove the fixedly restriction of maximized window, and unique limiting factor is the maximum cycle time.
The control messages of IPACT is not the APON or the EPON regulation message of standard, it inserts escape code (Escape in data flow, abbreviation " ESC ") character is the control messages data with the sign back, heel is with ONU node sign (Node Identifier, be called for short " NID ") and request authorized window size (Window Size is called for short " WS ").
In addition, in the ITU-T DBA agreement that G.983.4 standard proposes, the adaptive container of transmission (the Transmission Container that business from ONU is divided into several types, be called for short " T-CONT "), be essentially bearing asynchronous transmission mode (Asynchronous Transfer Mode, abbreviation " ATM ") virtual path (Virtual Path, be called for short " VP ") or Virtual Channel (Virtual Channel, abbreviation " VC ") " pipeline ", VP and VC with different service quality (Quality of Service is called for short " QoS ") requirement are programmable to being multiplexed with of T-CONT.Every kind of T-CONT type has its specific allocated bandwidth requirement.Be divided into 4 class adapters from high to low according to the priority of managing business, be respectively T-CONT1, T-CONT2, T-CONT3 and T-CONT4, T-CONT5 can its objective is in order to reduce the quantity of the adaptive container of transmission all professional adaptive.And allocated bandwidth requires there are four types: fixed-bandwidth guarantees bandwidth, the non-assured bandwidth and the transmission bandwidth of doing the best.
This DBA agreement has three kinds of strategies: non-state reports (Non-Status-Reporting is called for short " NSR "), and state reports (Status-Reporting is called for short " SR ") and mixed type.For the NSR strategy, OLT will carry out business monitoring; For the SR strategy, ONU and Optical Network Terminal (OpticalNetwork Terminal is called for short " ONT ") want status report to give OLT; For mixed strategy, OLT should carry out business monitoring, handles the status report from ONU/ONT again.
In the SR strategy, ONU gathers the state of transmission adaptor except that T-CONT1, reports OLT by physical layer operations management maintenance (Physical Layer Operation, Administration, Maintenance are called for short " PLOAM ") information frame.OLT draws the state of each container among the ONU according to up PLOAM information, according to algorithm assigns guarantee bandwidth, do not guarantee bandwidth and as possible transmission bandwidth give each container wherein, allocated bandwidth has adopted various dispatching methods to realize its fairness.Memoryless such as having, progressively increase progressively, progressively increase and decrease scheduling algorithm.
The bandwidth of these algorithms is upgraded difference, has when congested when detecting certain T-CONT, and the more resources of memoryless algorithm assigns are organized to this, and the resource of distribution is irrelevant with previous Resources allocation; Progressively add algorithm then formerly on the basis of Resources allocation, increases more resource allocations gradually and organizes to this; Progressively increase and decrease algorithm formerly on the basis of Resources allocation, gradually reduce other group resources, distribute to the resource of this group with increase.
In actual applications, there is following problem in such scheme: the system that can only be applied in single character, business that can not be dissimilar according to the Different Strategies differentiating and processing, can't satisfy the QoS demand of multiple business type, can't carry out allocated bandwidth according to the customer service port, situation that can't dynamic process ONU off-line.
Cause a main cause of this situation to be, all different business is not provided with different allocation strategies; Polling cycle causes the data of same business to send not timing along with the data volume adaptive change in the technical scheme one, can not satisfy the demand of the uniform real-time service of time delay; Take the repeating query of Round-Robin formula permanent order in the technical scheme two, be specially at connection-oriented, protocol Data Unit (Protocol Data Unit, abbreviation " PDU ") APON of fixed length uses, and the bandwidth update mechanism at be T-CONT, can not carry out bandwidth allocation process according to different port.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of dynamic bandwidth allocation apparatus and method of EPON, it is professional transparent to make distribution method of dynamic bandwidth realize, can adapt to the different kinds of business demand, improve bandwidth availability ratio, realize the bandwidth fair allocat, robustness is good, and is real-time, and can carry out allocated bandwidth to different port, support the off-line bandwidth of ONU to discharge simultaneously.
In order to solve the problems of the technologies described above, the embodiment of the invention provides a kind of distribution method of dynamic bandwidth of EPON, comprising:
Optical line terminal OLT receives the bandwidth assignment request of a plurality of business that come from optical network unit ONU;
The reporting information that carries in the bandwidth assignment request according to described optical network unit is for the described business of described optical network unit is authorized;
According to the information of authorizing, the uniform service under the same optical network unit is generated authorization messages;
The described authorization messages that generates is sent to corresponding optical network unit.
The embodiment of the invention also provides a kind of dynamic bandwidth allocation apparatus of EPON, comprising: the bandwidth authorizing unit is used to receive the bandwidth assignment request of a plurality of business that come from optical network unit; The reporting information that carries in the bandwidth assignment request according to described optical network unit is for the described business of described optical network unit is authorized;
The authorization messages generation unit is used for according to the information of authorizing the uniform service under the same optical network unit being generated authorization messages;
The authorization messages transmitting element sends to corresponding optical network unit with the described authorization messages that generates.
The embodiment of the invention also provides a kind of passive optical network, comprises optical line terminal OLT, and described OLT and a plurality of optical network unit ONU communicate; Described OLT is used to receive the bandwidth assignment request of a plurality of business that come from described ONU; According to the reporting information that carries in the described bandwidth assignment request, for the described business of described optical network unit is authorized; According to the information of described mandate, the uniform service under the same optical network unit is generated authorization messages; The described authorization messages that generates is sent to corresponding optical network unit.
By implementing embodiments of the invention, can bring comparatively significantly beneficial effect, make that promptly Dynamic Bandwidth Allocation is transparent to business, can adapt to TDM/EF, AF, DF and MPCP message must transmit and CPU/OAM guarantee multiple business demand such as forwarding, improve bandwidth availability ratio, the fair allocat bandwidth, robustness is good, real-time, more effectively utilize bandwidth resources, avoid the wasting of resources.
Description of drawings
Fig. 1 is the passive optical network structure schematic diagram;
Fig. 2 is the principle schematic of periodic time self-adapting intersection round-robin method;
Fig. 3 is that uplink service according to an embodiment of the invention activates ONU Bitmap register and corresponding uplink service activates the structure chart that port Bitmap shows;
Fig. 4 is up vMAC reporting information list structure figure according to an embodiment of the invention;
Fig. 5 is the authorization method flow chart of all kinds of business according to an embodiment of the invention;
Fig. 6 is up vMAC authorization message list structure figure according to an embodiment of the invention;
Fig. 7 is ONU state information list structure figure according to an embodiment of the invention;
Fig. 8 is that authorization messages according to an embodiment of the invention generates method flow diagram;
Fig. 9 is that ONU according to an embodiment of the invention activates time-out count list structure figure;
Figure 10 is an ONU obsolescence of information method flow diagram according to an embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
At first it may be noted that in the distribution method of dynamic bandwidth of EPON proposed by the invention, comprise service log-on, allocated bandwidth, authorization messages, ONU obsolescence of information.The present invention classifies miscellaneous service, and carries out different allocation strategies for the different data structure of dissimilar business arrangements.The present invention also handles the different port under the same ONU respectively.In addition, the present invention also monitors the ONU state, dynamically discharges the resource of off-line ONU.Describe one embodiment of the present of invention below in detail.
For business is classified, different port is handled respectively, the data structure of all kinds business and the data structure of port need be set, processing so that system classifies.In one embodiment of the invention, according to priority business is divided into following a few class:
Transmit professional fast, as time division multiplexing (Time Division Multiplex, abbreviation " TDM "), quicken to transmit (Expedited Forwarding, be called for short " EF ") etc., here be referred to as the EF business, this type of service needed is the real-time forwarding of time-delay evenly, and bandwidth is unrestricted substantially, so priority is the highest;
Multi-point Control Protocol (Multi-Point Control Protocol, be called for short " MPCP ") messaging service, MPCP message is used for the normal MPCP communication of system, be divided into automatic discovery MPCP message and non-automatic discovery MPCP message, the related parameter that has of MPCP message is all fixed, the present invention also will according to ONU timely MPCP message judge whether that it is online;
Guarantee to transmit (Must Forwarding, be called for short " MF ") business, as CPU (CentralProcess Unit, abbreviation " CPU ") message, the message of OAM, this type of service needed guarantees that message correctly transmits, be used for operation, management, maintenance and preset module (Operation Administration, Maintenance and Provisioning are called for short " OAM﹠amp; Communication between P ") and OLT and ONU, so priority is also higher;
The reliable business of transmitting is promptly reliably transmitted (Assured Forwarding is called for short " AF "), and this type of service needed guarantees the lowest-bandwidth of appointment, but less demanding to real-time;
Transmit business as possible, as default forwarding (Default Forwarding is called for short " DF "), this type of does not have the lowest-bandwidth requirement, so priority is minimum.
The present invention adopts the mode of centralized control reporting information, and OLT manages the state of each ONU.In a preferred embodiment of the present invention, the automatic discovery of ONU and the interacting message of registration process adopt, the message interaction process of international institute of electrical and electronic engineers IEEE802.3ah standard.
In order to carry out being convenient to separate service when data send mandate, divide priority ground repeating query, in a preferred embodiment of the present invention, the uplink service that miscellaneous service is set activates the ONU active information that ONU position mapping (Bitmap) register is preserved miscellaneous service, activate ONU Bitmap register (Ingress MPCP Active Bitmap such as up MPCP, be called for short " IMAB "), up MF activation of service ONU Bitmap register (Ingress Must Forwarding Active Bitmap, be called for short " IMFAB "), up EF activation of service ONU Bitmap register (Ingress Expedited Forwarding ActiveBitmap, be called for short " IEFAB "), up AF activation of service ONU Bitmap register (IngressAssured Forwarding Active Bitmap, be called for short " IAFAB "), up DF activation of service ONUBitmap register (Ingress Default Forwarding Active Bitmap is called for short " IDFAB "); The business that with the port is unit simultaneously has EF, AF, DF etc., these business also need be provided with uplink service activation port position mapping (Bitmap) table and preserve the active information of these business at port, such as up EF activation of service Bitmap table (Ingress Expedited Forwarding Active Bitmap Table, be called for short " IEFABT "), up DF activation of service Bitmap table (Ingress Assured ForwardingActive Bitmap Table, be called for short " IAFABT "), up AF activation of service Bitmap table (IngressDefault Forwarding Active Bitmap Table is called for short " IDFABT ").
As shown in Figure 3, whether uplink service activates the corresponding position (bit) that ONU Bitmap register comprises N ONU, be used to indicate this type of business of this ONU to be activated, such as 1 expression activation, 0 expression un-activation; The uplink service on right side activates the corresponding list item that port Bitmap table comprises N ONU among the figure, the content of each list item (content) is being stored the information that corresponding ONU institute descended this type of business of each port of extension whether to be activated, such as being that each port correspondence one, 1 expression activates, 0 expression un-activation, and system leaves these tables in the memory in, and can be according to corresponding optical network unit identifier (Optical Network Unit Identifier, be called for short " ONUID ") come index (index) list item of ONU accordingly, to make things convenient for the reading-writing port service activation information.
Need to prove, in the service log-on process, logical link identifier (Logical Link Identifier for the ONU distribution, be called for short " LLID ") be { ONUID, the form of port activation Bitmap}, the retrieval of miscellaneous service active information, bandwidth allocation information table is carried out in this form ONUID easy to use and each port skew (Offset), also is convenient to carrying out of multicast service.
ONU its MPCP port in registration process promptly is activated, and active information adds among the IMAB; Then MF port activation after the ONU registration, active information add among the IMFAB, here the default business that CPU and OAM are all arranged of each ONU.
ONU succeeds in registration the back to the assignment of the CPU of OLT bandwidth on demand, webmaster by with the transmission of carrying out bandwidth information alternately of the CPU of OLT.Bandwidth information comprises the activation of EF service port, the activation of AF and DF service port and the bandwidth of this port.The active information of EF, AF and DF service port adds among IEFAB, IAFAB, the IDFAB respectively and the corresponding list item of IEFABT, IAFABT, IDFABT in, the corresponding positions of IEFAB, IAFAB, IDFAB reflects respectively whether this ONU has the information of EF, DF, AF activation of service, and EF, DF, AF business that the corresponding list item of IEFABT, IAFABT, IDFABT then identifies those ports of this ONU are activated.
Carry out the service port of bandwidth control for needs, corresponding bandwidth information table (BandwidthInformation Table is set, be called for short " BIT "), be used to deposit each fixedly interior data volume that sends of polling cycle (being the virtual frames cycle), be called transmission quantum (Transmit Quantum), its unit can be byte (Byte), word (Word) etc.Same system carries out the list item retrieval according to ONUID and each port skew (Offset).
OLT mutual by with webmaster, can dynamic operation revise the content that uplink service activates ONU Bitmap register relevant bits, activates port Bitmap epiphase pass list item and bandwidth information epiphase pass list item, thereby realize the dynamic insertion deletion of ONU service port and reshuffling of bandwidth information.
In each polling cycle, ONU reports outgoing data length by the REPORT message of IEEE802.3ah standard to OLT, each message includes 8 queuing data length and reports item, and corresponding relation between predetermined each formation and ONU port, makes OLT to distinguish and reports length from which port.Set the effective marker of each formation simultaneously, whether effectively or with dead queue length be changed to zero to indicate that this is invalid such as 8 formations of sign of dividing 8 bit correspondences.When the extension port is greater than 8 under the ONU, adopt a plurality of REPORT message to characterize, subsidiary sequence number in the message with the continuity of a plurality of REPORT in the sign one-period, makes OLT can according to the definite item that respectively reports of a plurality of message that receive from which port.
For the reporting information to each port is handled respectively, OLT will report the outgoing data length information to be stored in (the Virtual MAC with virtual MAC, abbreviation " vMAC ") up vMAC reporting information table (the Report Information Table of classification, be called for short " RIT ") in, Fig. 4 shows the structure of this table: each list item is corresponding to the reporting information of each ONU port, and system is by the ONUID index; For general service, as OAM, CPU and common data such as forwarding business, list item comprises and reports sign (Reported Flag), reports outgoing data length (Report), whether interior this vMAC of current virtual frames cycle of sign reports outgoing data wherein " to report sign ", and the unit that sends quantum in arithemetic unit of " reporting outgoing data length " and the bandwidth information table is consistent; For the MPCP messaging service, list item comprises and reports sign (Reported Flag), up MPCP type of message territory (Type), keeps territory (Reserved), wherein up MPCP type of message territory indicates the type of this up MPCP message, as " REGISTER REQ ", " REGISTER ACK " and " Normal REPORT " etc., make OLT can distinguish ONU place registration phase so that the descending MPCP type of message that clearly should generate.Because the EF business is being determined virtual frames week after date, the data length that port can send in the cycle a virtual frames is certain, therefore need not carry out outgoing data length and report.
Allocated bandwidth, promptly business datum sends and authorizes, and is that OLT is according to the process according to the mandate of service priority poll such as professional ONU port activation information, bandwidth allocation information, reporting information.For the QoS that satisfies the EF business guarantees that the cycle of mandate is the virtual frames cycle, other allocated bandwidth operation is all carried out according to the virtual frames cycle.The uplink business data that describes one embodiment of the present of invention below with reference to Fig. 5 in detail sends authorization method.
The present invention is respectively the EF business from high to low, finds the order poll mandate of MPCP, non-automatic discovery MPCP, MF business, AF business, DF business automatically according to service priority.
OLT sends authorization messages to all kinds of uplink services for convenience, the present invention is provided with up vMAC authorization message table (Grant Information Table, be called for short GIT), be used for storage service and send the authorization message of authorizing generation, when in up receiving course, OLT reads the data in the authorization message table, and produces authorization messages, be sent to corresponding ONU, finish the Bandwidth Dynamic Allocation process.
Fig. 5 shows the authorization method flow process of all kinds of business.
In step 501, determine current authorized ports according to the uplink service active information, perhaps start and find MPCP message automatically according to the enabling counting device.For business such as EF, MF, AF, DF and non-automatic discovery MPCP, the uplink service that described uplink service active information comprises all kinds of business activates ONUBitmap register and uplink service activation port Bitmap table, and these information of poll obtain current such service port that needs operation.For automatic discovery MPCP, for the ONU that dynamic registration is newly reached the standard grade, set an enabling counting device of finding MPCP automatically, each meter is full then to be started, and starts performance period to find that automatically the MPCP process does not take too much bandwidth.
Then enter step 502, under the situation that bandwidth resources allow, authorize, record authorized window information or descending MPCP type.The judgement whether bandwidth resources allow is according to port assignment bandwidth, i.e. the interior data volume that allows transmission of virtual frames cycle, perhaps the fixed data amount of MPCP, and remaining bandwidth is judged in the current virtual frames cycle, the former is during greater than the latter, and bandwidth resources allow, and can authorize; Perhaps, have only when port has outgoing data to report for the AF business, and the outgoing data amount that reports be not more than residue can send data volume also be not more than this port bandwidth assignment send data volume and the amount of having a deficit and, just be judged as the bandwidth resources permission; Perhaps for the DF business, have only when port has outgoing data to report and remains to send that data volume is not less than the reported data amount and bandwidth assignment maximum can send the maximum in the data volume, just be judged as bandwidth resources and allow.
Wherein, for the EF business; boundary belt according to the tentation data stamp time of advent, needs adding when belonging to different ONU with the last port of this virtual frames in the cycle; determine that its data send zero-time (Start Time) and data transmission length (Length), and record in the corresponding list item of this port of such professional GIT.The wherein said tentation data stamp time of advent is meant the data sign time of advent in predetermined next up virtual frames cycle, and the normative reference of this time marking is the free oscillation clock at OLT place.
For the MPCP messaging service, determine descending MPCP type of message according to the RIT upstream message type of current MPCP port, find that automatically MPCP is a fixed type, and described MPCP type and authorization flag are write in the corresponding GIT list item of MPCP port.
For MF, DF business, it is authorized corresponding length window, and write in the corresponding GIT list item according to reported data length information, the existing amount of having a deficit of authorizing among the port RIT.
For the AF business, according to reported data length information among the port RIT and the existing amount of having a deficit of authorizing it is authorized corresponding length window, calculate the new mandate amount of having a deficit simultaneously, and write in the corresponding GIT list item.
Then enter step 503, upgrade relevant information.The operation of upgrading relevant information comprises, upgrade remaining bandwidth in the current virtual frames cycle, upgrade the current tentation data stamp time of advent and interior remaining bandwidth of virtual frames cycle in the EF business, the enabling counting device of MPCP is found in zero clearing automatically, remove among MF, AF, the DF and report sign etc. in the corresponding RIT table, wherein remove reporting in the RIT table and indicate it is repetitive endowment not to take place for fear of next virtual frames cycle.
In a preferred embodiment of the present invention, the mandate dispatching method of AF business adopts and leaks the barrel shape algorithm.Those of ordinary skill in the art are appreciated that the mandate scheduling of AF business also can adopt Weighted Round Robin, and do not influence the spirit and scope of the invention.
Then enter step 504, judge whether the ports having unauthorized,, enter step 501, otherwise finish the mandate of original service port, enter the mandate of next priority service port if having.Wherein, find automatically MPCP weekly the phase at most for once authorize, so directly enter the mandate of next priority service port.
Fig. 6 shows the data structure of up vMAC authorization message table, and each list item is corresponding to the authorization message of each ONU port, and system is by the ONUID index; For up EF business, list item comprises authorization flag (Granted Flag), data send zero-time (StartTime), data transmission length (Length), wherein whether authorization flag indicates this service port to be authorized to, data send zero-time promptly this port be authorized to time that can begin to send, data send length promptly this port be authorized to send the length of data; For up MF business, list item comprises authorization flag (Granted Flag), reservation territory (Reserved), data transmission length (Length), reserves the promptly still undefined part in territory; For the MPCP port, list item comprises authorization flag (Granted Flag), descending MPCP type of message (Type), reserves territory (Reserved), and wherein descending MPCP type of message comprises " DiscoveryGATE ", " Normal GATE ", " REGISTER﹠amp; GATE ", the descending MPCP of " GATE " type is specifically designed to bearer authorization message here; For other business, list item comprises authorization flag (GrantedFlag), the counter of having a deficit (Deficit Cnt), data transmission length (Length), the counter of wherein having a deficit is used to write down the mandate amount of having a deficit of this port, the mandate amount of having a deficit reflects the mandate bandwidth of the former uplink service of this service port accumulative total in the cycle more than the degree that reports bandwidth, and system comes the QoS of balance AF, DF business to guarantee by the mandate amount of having a deficit.Send authorization stages in business datum, only EF service authorization data are sent zero-time, the log-in window of the automatic MPCP of discovery is also determined concerning the ONU number reaches the definite PON system of the longest extended range in other business, non-automatic discovery MPCP is owing to the MPCP message-length is that its mandate length of event of fixing is also fixed, their mandate length no longer writes the authorization message table, and the mandate length of AF and DF service port will write the authorization message table owing to fixing.
For the ease of management ONU, the present invention also is provided with ONU state information table (StatusInformation Table is called for short " SIT "), is used to characterize the state information of ONU.ONU state information table generates in the MPCP message interaction process, and ONU state of living in is determined according to institute's interactive messages type between current OLT and ONU.Fig. 7 shows the data structure of state information table, the corresponding list item of each ONU, and system is by the ONUID index, and list item comprises ONU state information (ONUStatus).In a preferred embodiment of the present invention, represent the ONU state information with 2 bits, be respectively invalid (Invalid Entry), registered (Registered ONU), in the registration (RegisteringONU), wherein this ONUID of invalid representation is unallocated to any ONU, this ONU of registered expression has finished registration process can normally carry out the business datum forwarding, this ONU of expression is in the registration process in the registration, and the concrete current interaction message of the ONU in the registration can be learnt by MPCP port reporting information table (RIT) list item and authorization message table (GIT) list item of this ONU.
After finishing professional transmission Authorized operation, OLT will generate authorization messages and send authorization messages to corresponding ONU in certain moment in virtual frames in the cycle.The principle that authorization messages generates is: for the port traffic to each ONU generates few authorization messages of trying one's best; simultaneously also be in order in upstream, to insert boundary belt and lock in time section between ONU less; except EF the mandate send window of other port traffic be before and after the next-door neighbour, so that the authorization data of other ports except that EF sends zero-time is definite and write in the authorization messages at the authorization messages generation phase.
Fig. 8 shows the flow process of authorization messages generation method according to an embodiment of the invention.
As shown in the figure, in step 801, read ONU state information table list item one by one.System is that unit carries out the authorization messages generation with ONU, makes authorization messages carry in the descending MPCP message of " GATE " in type, and can handle the uniform authorization of the service port of same ONU.
Then enter step 802, judge whether current ONU is invalid, if enter step 801, otherwise enter step 803.If the ONU state information of current ONUID correspondence is invalid, then do not authorize, continue down read status information table.
In step 803, read the GIT list item of each port correspondence of this ONU.Authorization message is stored in licensing process in the authorization message table, and the list item that reads each port correspondence can obtain this port authorization message.After this enter step 804.
In step 804, generate descending MPCP message according to authorization message.System passes through descending MPCP message bearing with authorization messages, at first determine descending MPCP type of message according to the MPCP type of message of ONU state of living in and mandate, send the transmitting time of the mandate tentation data stamp that the authorization stages succession comes according to each vMAC port authorization conditions with by business datum then, the authorization data of determining each vMAC port sends zero-time, and authorizing relevant information to write in the descending MPCP message of generation.
Then enter step 805, remove this GIT list item authorization flag, repeat to generate to avoid authorization message.
Then enter step 806, judge whether to run through all state information table list items, if, then show the generation of having finished all ONU authorization messages, finish the authorization messages generative process in this virtual frames cycle, continue the read status information table otherwise return step 81.
At last, the present invention has provided the method for handling off-line ONU or faulted ONU, i.e. ONU obsolescence of information process.System is provided with ONU and activates the time-out count table, counts for the not response time of each ONU, if count value surpasses the off-line threshold of regulation, judges that then this ONU is invalid, discharges the resource of invalid ONU.
Fig. 9 shows the data structure that ONU activates the time-out count table, the corresponding list item of each ONU, and system is by the ONUID index, and list item comprises and reports sign (Reported), activates the time-out count device (Active Timeout Count, abbreviation " ATC ").
Figure 10 shows OUN obsolescence of information method flow according to an embodiment of the invention,
As shown in the figure, in step 101, read ONU state information table list item one by one.System is according to the ONUID index.
Then enter step 102, judge whether current ONU is effective, if, then enter step 103, otherwise, return step 101, invalid ONU is disregarded, continue down to read.
In step 103, read the activation time-out count table list item of this ONU correspondence, be used to judge whether off-line of this ONU, after this enter step 104.
In step 104,, carry out zero clearing or counting operation to activating the time-out count device, and removing reports sign according to whether reporting MPCP message.Whether system reports MPCP message to operate activating the time-out count device according to this ONU in this virtual frames in the cycle, if, then zero clearing, otherwise counting.
Then enter step 105, judge whether activate the time-out count device surpasses off-line threshold, if, show this ONU off-line, enter step 106; Otherwise, show that this ONU is online, enter step 107.
In step 106, the ONU state information table list item of putting this ONU correspondence is a disarmed state, and discharges the related resource of this ONU, after this enters step 107.For off-line ONU, it is invalid that system is provided with at the state information table, indicates that this ONU does not exist.The related resource of this ONU comprises: uplink service activates the corresponding positions of Bitmap register IMPAB, IMFAB, IEFAB, IAFAB, IDFAB, uplink service activates the corresponding list item of Bitmap Table I EFAT, IAFAT, IDFAT, the corresponding list item of bandwidth information table, and the ONUID that originally distributed to this ONU.
In step 107, judge whether to run through all state information table list items, if, then finish the ONU obsolescence of information process in this virtual frames cycle, continue the read status information table otherwise return step 101.
The present invention is applicable to the master-slave system that is inserted by OLT control ONU, the forwarding of up all business datums of OLT control ONU inserts and comprises MPCP or other MAC message, descending then is broadcast mode, data are filtered reception at the ONU place, descending transmission scheduling also is based on priority, carries out descending scheduling with the priority order of EF, MPCP, CPU/OAM, AF, DF and transmits.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (13)
1. the distribution method of dynamic bandwidth of an EPON is characterized in that, comprising:
Optical line terminal OLT receives the bandwidth assignment request of a plurality of business that come from optical network unit ONU;
The reporting information that carries in the bandwidth assignment request according to described optical network unit is for the described business of described optical network unit is authorized;
According to the information of authorizing, the uniform service under the same optical network unit is generated authorization messages;
The described authorization messages that generates is sent to corresponding optical network unit.
2. method according to claim 1 is characterized in that, described generation authorization messages comprises:
With ONU is that unit generates authorization messages.
3. method according to claim 1 is characterized in that, when described optical network unit sends authorization messages, the mandate send window of at least two business of same optical network unit is close to before and after being.
4. method according to claim 1 is characterized in that, and is described when authorizing for the described business of described optical network unit,
With the service port is that unit is authorized.
5. according to claim 1 or 4 described methods, it is characterized in that, described when authorizing for the described business of described optical network unit,
Authorize by preset priority.
6. method according to claim 1 is characterized in that, also comprises:
Write down the time that each ONU does not respond, when the response time reaches pre-set threshold, discharge the resource of described ONU when described not.
7. method according to claim 6 is characterized in that, also comprises:
Set up ONU and activate the time-out count table, be used for writing down the time that each ONU does not respond.
8. the dynamic bandwidth allocation apparatus of an EPON is characterized in that, comprising:
The bandwidth authorizing unit is used to receive the bandwidth assignment request of a plurality of business that come from optical network unit; The reporting information that carries in the bandwidth assignment request according to described optical network unit is for the described business of described optical network unit is authorized;
The authorization messages generation unit is used for according to the information of authorizing the uniform service under the same optical network unit being generated authorization messages;
The authorization messages transmitting element sends to corresponding optical network unit with the described authorization messages that generates.
9. dynamic bandwidth allocation apparatus according to claim 8 is characterized in that, also comprises:
Burin-in process unit: be used to write down the time that each ONU does not respond, when the response time reaches pre-set threshold, discharge the resource of described ONU when described not.
10. a passive optical network comprises optical line terminal OLT, and described OLT and a plurality of optical network unit ONU communicate, and it is characterized in that:
Described OLT is used to receive the bandwidth assignment request of a plurality of business that come from described ONU; According to the reporting information that carries in the described bandwidth assignment request, for the described business of described optical network unit is authorized; According to the information of described mandate, the uniform service under the same optical network unit is generated authorization messages; The described authorization messages that generates is sent to corresponding optical network unit.
11. passive optical network according to claim 10 is characterized in that:
Described OLT is that unit generates authorization messages with ONU when generating authorization messages.
12. passive optical network according to claim 10 is characterized in that:
Described OLT is when corresponding optical network unit sends authorization messages, and the mandate send window of at least two business of same optical network unit is close to before and after being.
13. passive optical network according to claim 10 is characterized in that:
Described OLT is that unit is authorized with the service port when authorizing for the described business of described optical network unit.
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