WO2005039078A1 - Procede de repartition dynamique de la largeur de bande dans un reseau optique passif - Google Patents
Procede de repartition dynamique de la largeur de bande dans un reseau optique passif Download PDFInfo
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- WO2005039078A1 WO2005039078A1 PCT/CN2004/001195 CN2004001195W WO2005039078A1 WO 2005039078 A1 WO2005039078 A1 WO 2005039078A1 CN 2004001195 W CN2004001195 W CN 2004001195W WO 2005039078 A1 WO2005039078 A1 WO 2005039078A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
- H04B10/272—Star-type networks or tree-type networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0066—Provisions for optical burst or packet networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0064—Arbitration, scheduling or medium access control aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0084—Quality of service aspects
Definitions
- the present invention relates to bandwidth allocation techniques for passive optical networks, and more particularly to dynamic bandwidth allocation methods for passive optical networks. Background of the invention
- Passive Optical Network is an emerging broadband access fiber technology covering the last mile. It does not require node equipment at the optical branch point. It only needs to install a simple optical splitter. It saves the advantages of optical cable resources, bandwidth resource sharing, investment in computer room, high equipment security, fast network construction, and low cost of integrated network construction. It has been widely used in recent years and has become the main type of optical access network.
- an optical line terminal (OLT, Optical Line Terminal) is a master node device, and an optical splitter and multiple optical network units (ONUs, The optical network unit is connected, and performs ONU registration, pending data authorization, and media access control sub-layer (MAC) message interaction; the ONU is a slave node device, and responds to the OLT to find a message and reports it to the device.
- the length of the data is sent, and the data of each port is sent according to the authorization information, and multiple user terminals are connected to support multi-service access.
- the optical access network how to allocate bandwidth reasonably, effectively utilize network resources and meet service requirements becomes an important part of the PON MAC solution.
- Static Bandwidth Allocation SBA
- Dynamic Bandwidth Allocation DBA
- the bandwidth of each ONU or its port is fixedly allocated.
- the gap can not be preempted, so the bandwidth utilization is relatively low, and the self-likelihood service with high burst rate is suitable.
- the stress is not strong.
- the dynamic bandwidth allocation algorithm is a mechanism or algorithm for performing fast bandwidth re-allocation based on the current user service requirements. According to the requirements of the ONU burst service, the PON bandwidth utilization is improved by dynamically adjusting the bandwidth between the ONUs.
- IPACT Interleaved Polling with Adaptive Cycle Time
- ITU-T International Telecommunication Union Standards Department
- the main idea is to poll the next ONU before the sending data of the previous ONU arrives at the OLT to determine whether the authorization and authorization quotas and the like. And according to the estimated current data transmission end time, the data transmission start time of the next ONU is determined.
- T-CONT Transmission Container
- T-CONT5 transmission adaptation containers
- the purpose is to reduce the number of transmission adaptation containers.
- Each T-CONT has its own specific bandwidth allocation requirements. There are four types of bandwidth allocation requirements: fixed bandwidth, guaranteed bandwidth, non-guaranteed bandwidth, and best-effort bandwidth.
- Three bandwidth allocation strategies such as non-state reporting (NSR, Non-Status-Reporting), status reporting (SR, Status-Reporting), and hybrid types, are formulated.
- the polling period is adaptively changed according to the number of data, which results in unscheduled data transmission of the same service, and cannot meet the requirement of real-time service with uniform delay.
- the Round-Robin-type fixed-sequence round-robin is adopted, which is specifically designed for a connection-oriented, protocol data unit (PDU) fixed-length APON application.
- the bandwidth update mechanism is for T-CONT, and bandwidth allocation processing cannot be performed for different services according to different ports.
- the technical problem to be solved by the present invention is to provide a dynamic bandwidth allocation method for a passive optical network, which enables the dynamic bandwidth allocation method to implement service transparency, adapt to different types of service requirements, allocate bandwidth to different service ports, and improve bandwidth utilization. Fair distribution of bandwidth.
- the present invention provides a dynamic bandwidth allocation method for a passive optical network, where the passive optical network includes an OLT and a plurality of ONUs connected to the OLT, including: a) between the ONU and the OLT The services involved in the communication process are classified according to different transmission requirements, giving each type of service different priorities;
- the method further includes an ONU information aging process:
- step A Check the status of each ONU one by one, determine whether the current ONU status is invalid, and if yes, return to step A, continue to check the status of the next ONU, otherwise, proceed to step B;
- step B Determine whether the current ONU reports the MPCP message in the bandwidth allocation polling period, and if so, clear the activation timeout counter corresponding to the current ONU, and proceeds to step C; otherwise, directly proceeds to step C;
- step C Determine whether the current ONU activation timeout counter has exceeded the set offline threshold. If yes, set the current ONU status information to the invalid state in the ONU status information table, and release the resources related to the ONU. Step 0, otherwise, go to step D;
- step D Determine whether there is any ONU that has not performed status check. If yes, return to step A to continue checking the status of the next O J; otherwise, end the O U information aging process of the bandwidth allocation polling cycle.
- the method further includes: setting an ONU status information table, and generating status information of the corresponding ONU according to the MPCP message exchanged between the ONU and the OLT, and storing the status information in the ONU status information table, where the status information of each ONU is indexed by the ONUID;
- the ONU activation timeout count table is set.
- the table includes an activation timeout counter for counting the non-response time of each ONU, an indication flag indicating whether the corresponding ONU reports the MPCP message, an activation timeout counter and a report flag corresponding to each ONU. Indexed by ONUID;
- the determining process in step A includes: reading the status information of the ONU one by one from the ONU status information table according to the ONUID index, and determining whether the current O U status information is invalid;
- the determining process in step B includes: reading the corresponding entry of the current ONU in the activation timeout count table, determining whether the corresponding report item has a report flag, and if so, determining The current ONU reports the MPCP message in the bandwidth allocation period. Otherwise, it determines that the current ONU does not report the MPCP message in the bandwidth allocation period.
- the step C and the step D further include: clearing the report flag of the current ONU in the ONU activation timeout count table;
- the determining process in step D includes: determining whether all entries of the ONU state information table have been read, and if so, determining that there is no ONU that has not performed the state check; otherwise, determining that there is an ONIL that has not been checked for status.
- the method further sets a vMAC authorization information table, configured to store authorization information of each service port of the ONU, and an authorization flag indicating whether the service port is authorized, and the authorization flag of the same service port corresponds to the authorization information, and is indexed by the ONUID;
- Step b) the saving the authorization information includes: recording the authorization information of the service port in the vMAC authorization information table, and setting the authorization flag corresponding to the service port to be authorized;
- the reading of the authorization information in the step c) includes: searching for an entry corresponding to the service port of the same ONU according to the ONUID index in the vMAC authorization information table, and searching for the authorized service port according to the authorization flag in the entry, and reading is authorized.
- the step d) further includes: setting an authorization flag in the vMAC authorization information entry corresponding to the service port that has read the authorization information to indicate that the authorization is not authorized.
- the method further includes: setting an ONU state information table, storing state information of each ONU, the ONU state information table entry being generated during the MPCP message interaction process, and indexed by the ONUID;
- the step c) further includes: reading the status information of the ONU one by one according to the ONUID index in the ONU status information table, determining whether the current ONU status is invalid, and if yes, returning to read the status of the next ONU in the ONU status information table. Information, otherwise, go to step c) 0
- the service is classified into high-to-low priority in the order of priority: fast forwarding service, automatic discovery of MPCP message service, non-automatic discovery of MPCP message service, MF service, reliable forwarding service, and best effort forwarding service.
- the method for the service other than the automatic discovery of the MPCP message service, the step b) the service data transmission authorization process includes:
- step bll5 Determine whether there is a port unauthorized. If yes, return to step bll). Otherwise, perform service data transmission authorization for the service port of the next priority service.
- the method further includes:
- the service activation port Bitmap table corresponding to each type of service is further configured for the port-based service, and the activation information indicating whether the service is activated in the corresponding port that is connected to the ONU is stored, and is indexed by the ONUID;
- the vMAC report information table stores the report information of the port connected to the ONU and is indexed by the ONUID.
- Step bl l includes: polling the service activated ONU Bitmap register and the service activation port Bitmap table corresponding to each type of service in priority order, and finding the activation information as the activated end The port is determined to be the current to-be-authorized port;
- the step bl2) further includes: searching for the report information of the current to-be-authorized port in the vMAC report information table;
- Step bl5 determining whether there is a port unauthorized by determining whether there is an unread entry in the service activated ONU Bitmap register and the service activation port Bitmap table, if yes, returning to step bll), otherwise, Query the service activation ONU Bitmap register and the service activation port Bitmap table corresponding to the next priority service.
- the authorization information includes a data transmission length and a data transmission start time
- the report information includes the reported data length to be sent
- Determining, by the step d), the initiation time of the authorization data transmission comprises: determining a data transmission start time in the authorization information as an authorization data transmission start time;
- the authorization information includes a downlink MPCP message type and a reserved domain, where the MPCP message type includes a Discovery GATE, a Normal GATE, a REGISTER&GATE, and the reported information includes an uplink MPCP message type field and a pre- Retained domain
- the authorization information includes a reserved domain and a data transmission length, and the reported information includes the reported data length to be sent;
- the authorization information includes an authorized deficit amount of the port and a data transmission length, and the reported information includes the reported data length to be sent;
- the authorization information includes a data transmission length
- the report information includes the reported data length to be sent.
- the method further includes setting a bandwidth information table for the service port that needs to perform bandwidth control, and storing the transmission quantum in each bandwidth allocation polling period corresponding to the allocated bandwidth information.
- the determining process further includes: The table queries the transmission quantum of the current service port, and sends the quantum according to the report information of the current service port to be authorized. And the remaining bandwidth resources in the current bandwidth allocation polling period, and determine whether the current bandwidth resource is allowed.
- the method further sets an activation counter for automatically discovering an MPCP message service for automatically discovering an MPCP message service;
- Step b) The service number sending authorization process includes:
- the method is for automatically discovering an MPCP message service, where the authorization information includes a downlink MPCP message type and a reserved domain, where the MPCP message type includes Discovery GATE, Normal GATE, REGISTER&GATE
- the method step d) further comprises: determining whether there is an ONU that has not performed port authorization, and if yes, returning to step c), otherwise, ending the process.
- the downlink authorization message of the method is a GATE downlink MPCP message.
- the reported information is carried by the REPORT message.
- the bandwidth allocation polling period of the method is a virtual frame period.
- the dynamic bandwidth allocation method of the passive optical network processes different services according to the priority level in the bandwidth allocation, and dynamically allocates bandwidth to adapt to different types of services.
- the requirements are transparent to the service; when the authorization message is sent, the port of the same ONU is processed centrally, and the data transmission start time is authorized, so that the authorization window allocated by different service ports under the same ONU is in time. Neighbors, there is no need to add a guard band between them, which reduces the protection bandwidth when data is transmitted and improves the bandwidth utilization.
- the present invention further adopts the ONU information aging mechanism to monitor the ONU status in real time, dynamically process the offline ONU, and release the occupied resources.
- the technical solution adopted by the present invention has obvious beneficial effects, that is, the dynamic bandwidth allocation is transparent to the service, and can adapt to the TDM/EF, AF, DF, and MPCP messages that must be forwarded and CPU/OAM. Ensure the forwarding of various service requirements, improve bandwidth utilization, allocate bandwidth fairly, be robust, and have real-time performance. Use bandwidth resources more effectively and avoid waste of resources.
- Figure 1 is a schematic diagram of the structure of a passive optical network
- FIG. 2 is a structural diagram of a service activated ONU Bitmap register and a corresponding service activation port Bitmap table according to an embodiment of the present invention
- FIG. 3 is a structural diagram of a vMAC report information table according to an embodiment of the present invention
- FIG. 4 is a flow chart of a method for authorizing various types of services according to an embodiment of the present invention
- FIG. 5 is a vMAC according to an embodiment of the present invention.
- FIG. 6 is a structural diagram of an ONU state information table according to an embodiment of the present invention
- FIG. 7 is a flowchart of an authorization message generating method according to an embodiment of the present invention
- FIG. 8 is a flowchart according to the present invention.
- FIG. 9 is a flowchart of the ONU information aging method according to an embodiment of the present invention. Mode for carrying out the invention
- the dynamic bandwidth allocation method of the passive optical network proposed by the present invention includes processes such as service registration, bandwidth allocation, issuing an authorization message, and aging of ONU information.
- bandwidth is allocated the service types of different service ports in the same ONU are processed separately, and the corresponding window length is granted.
- the ports of the same ONU' are processed in a centralized manner, and the data transmission start time is allocated, so that the same
- the authorization windows allocated by different service ports under the ONU are adjacent in time and time, and no protection band is needed between them, thereby improving bandwidth utilization.
- the present invention also monitors the ONU status in real time, and dynamically releases the resources of the offline ONU.
- the service port is a port that carries a certain service. It is a logical concept and does not completely correspond to the physical port of the ONU. For example, if a physical port simultaneously carries multiple services, the A physical port is divided into multiple service ports.
- services are classified into the following categories according to their priority:
- EF services such as: Time Division Multiplex (TDM), Accelerated Forwarding (EF), etc.
- TDM Time Division Multiplex
- EF Accelerated Forwarding
- This type of service requires even-delay real-time forwarding, and the bandwidth is essentially unlimited, so the priority is highest.
- MPCP Multi-Point Control Protocol
- MPCP message is used for normal MPCP communication of the system. It is divided into automatic discovery MPCP message and non-automatic discovery MPCP message. The relevant parameters of MPCP message are fixed.
- the invention will also determine whether the ONU is online according to the ONCP timely MPCP message. Ensure (MF, Must Forwarding) services, such as: Central Processing Unit (CPU, Central Process Unit) messages, OAM messages. Such services need to ensure that the message is correctly transmitted, used for OAM&P (Operation Administration, Maintenance and Provisioning) and communication between the OLT and the ONU, so the priority is also high.
- MF Must Forwarding
- Reliable forwarding services such as Assured Forwarding (AF)
- AF Assured Forwarding
- DF Default Forwarding
- the present invention adopts a centralized control method for reporting information, and the OLT manages the state of each ONU.
- the message interaction of the ONU's automatic discovery and registration process uses the International Institute of Electrical and Electronics Engineers (IEEE) 802.3ah standard message interaction process.
- service activation ONU bit map (bitmap) registers of various services are set to store ONUs of various services.
- Activation information such as MPCP activation ONU Bitmap register (IMAB, Ingress MPCP Active Bitmap), MF service activation ONU Bitmap register (IMFAB, Ingress Must Forwarding Active Bitmap), EF service activation ONU Bitmap memory (IEFAB, Ingress Expedited Forwarding Active Bitmap ), the AF service activates the ONU Bitmap register (IAFAB, Ingress Assured Forwarding Active Bitmap), and the DF service activates the ONU Bitmap register (IDFAB, Ingress Default Forwarding Active Bitmap).
- the services of the port are EF, AF, DF, etc. These services also need to set the service activation port bitmap (Bitmap) table to save the activation information of these services on the port, such as: EF service activation Bitmap table (IEFABT, Ingress Expedited Forwarding Active Bitmap Table ), AF Service Activate the Ingress Assured Forwarding Active Bitmap Table (IDFABT, Ingress Default Forwarding Active Bitmap Table).
- IEFABT EF service activation Bitmap table
- IDF Ingress Default Forwarding Active Bitmap Table
- the left side of the figure is the service activated ONU Bitmap register, which contains the corresponding bits (bits) of the N ONUs, which are used to indicate whether such services of the ONU are activated, such as 1 for activation and 0 for no.
- the service activation port Bitmap table on the right side of the figure contains the corresponding entries of the N ONUs. The content of each entry stores the service of each port of the corresponding ONU. Information, such as: if each port corresponds to a bit; 1 means active, 0 means inactive; and the system stores these tables in memory and can be based on the corresponding Optical Network Unit Identifier (ONUID) Indexes the corresponding ONU entries to facilitate reading and writing port service activation information.
- ONUID Optical Network Unit Identifier
- the Logical Link Identifier (LLID) assigned to the ONU is in the form of ⁇ ONUID, port activation Bitmap ⁇ , which facilitates the use of the ONUID and each port offset ( Offset) performs various service activation information and bandwidth allocation information retrieval, and facilitates the development of multicast services.
- the ONU's MPCP port is activated, and the activation information is added to the IMAB.
- the MF port is activated, and the activation information is added to the IMFAB.
- Each of the ONUs has a CPU and an OAM service by default.
- the network management performs bandwidth information transmission through interaction with the CPU of the OLT.
- the bandwidth information includes activation information of the EF service port, and activation information of the AF and DF service ports and the bandwidth of the port.
- the bandwidth of each virtual frame period of the EF service is fixed, so the bandwidth information does not need to include the bandwidth of the port.
- Activation information for EF, AF, and DF service ports is added to IEFAB, IAFAB, IDFAB, and IEFABT, respectively.
- the corresponding bits of IEFAB, IAFAB, and IDFAB respectively reflect whether the ONU has EF, DF, and AF service activation information
- the corresponding entries of IEFABT, IAFABT, and IDFABT identify which ports of the ONU. The EF, DF, and AF services are activated.
- a register with fixed bandwidth information can be set to store a fixed bandwidth; or a default bandwidth is pre-defined, and the message interaction is known. After the port type, the default bandwidth can be used to send data.
- the assigned bandwidth can be saved in the form of Transmit Quantum.
- the transmission quantum refers to the amount of data allowed to be transmitted in each fixed polling period of bandwidth allocation, and the transmission quantum can be obtained by multiplication by using the allocated bandwidth and the polling period, and the unit thereof can be a byte (Byte).
- the virtual frame period of the EF service is used as the polling period of the bandwidth allocation operation.
- the system can perform entry retrieval based on the ONUID and each port Offset, and read the contents of the corresponding entry to obtain the bandwidth information of the provision from the BIT table.
- the OLT can dynamically modify the service activation ONU Bitmap register related bits, activate the port Bitmap table related entries, and the contents of the bandwidth information table related entries, thereby implementing dynamic insertion deletion and bandwidth information of the ONU service port. Reconfiguration.
- each message contains eight queue data length report items.
- the correspondence between each queue and the ONU port is preset, so that the OLT can distinguish which port the reporting length comes from.
- the valid flags of each queue are set, for example: the bits corresponding to 8 bits respectively identify whether 8 queues are valid or active, 0 bits Corresponding to queue 0, 1 bit corresponds to queue 1, and so on. When the value of this bit is 0, it indicates that the corresponding queue is not activated. When it is 1, it indicates that the corresponding queue is active or valid.
- the ONU port is greater than eight, it is characterized by multiple REPORT messages, and a sequence number is attached to the message to identify the continuity of multiple REPORTs in a cycle, so that the OLT can determine each report item from multiple received messages. From which port.
- the OLT stores the reported data length information in a vMAC reporting information table (RIT, Report Information Table) classified by virtual MAC (vMAC, Virtual MAC).
- vMAC Report Information Table
- vMAC virtual MAC
- FIG. 3 the structure of the table is shown on the left side of the figure:
- Each entry corresponds to the reporting information of each ONU port, and the system is indexed by the ONUID.
- the entry contains the report flag (Reported Flag) and the length of the pending data.
- “Upper ID” indicates whether the vMAC reports the data to be sent in the current virtual frame period, the unit of the “reported data length to be sent” and the unit of the quantum in the bandwidth information table (Byte or Word, etc.)
- the entry contains the report identifier (Reported Flag), the uplink MPCP message type field (Type), and the reserved field (Reserved).
- "domain” indicates the type of the upstream MPCP message, such as: "REGISTER-REQ"
- the bandwidth allocation that is, the service data transmission authorization
- the bandwidth allocation is a process in which the OLT polls the authorization according to the service priority, such as the service ONU port activation information, the bandwidth allocation information, and the report information.
- the virtual frame period is set as the period of its polling authorization, and the bandwidth allocation operations of other services are also performed in the virtual frame period in the order of priority. That is, the bandwidth allocation operation of the EF is performed at the beginning of the virtual frame period, and the bandwidth allocation operations of the MPCP, MF, AF, and DF services are sequentially performed for the remaining time.
- the EF service the automatic discovery MPCP message service, the non-automatic discovery MPCP message service, the MF service, the AF service, and the DF service are sequentially polled and authorized.
- the present embodiment sets a vMAC Grant Information Table (GIT) for storing authorization information generated by the service transmission authorization.
- GIT vMAC Grant Information Table
- the OLT reads the data in the authorization information table, generates an authorization message, and sends it to the corresponding ONU to complete the bandwidth dynamic allocation process.
- FIG. 4 shows the authorization process of various types of services in this embodiment.
- Step 401 The OLT determines the current authorized port according to the uplink service activation information, or initiates an automatic discovery of the MPCP message according to the startup counter.
- the current authorized port can be obtained by polling the service activation ONU Bitmap register and the service activation port Bitmap table. Specifically: Polling the services of each service activates the ONU Bitmap register in order of priority from high to low.
- the ONU that is activated by the service is found by polling the activation information in the corresponding entry, and the port of the ONU is used as the current to-be-authorized port; , AF, DF, first poll the active ONU Bitmap register of the service to find the ONU activated by the service, and then find the active port Bitmap table of the service according to the found ONUID of the ONU, further determine the ONU Which port activates this type of service.
- the cycle start automatically discovers the MPCP process without occupying excessive bandwidth.
- Step 402 Find the information about the current to-be-authorized port in the RIT table, determine whether the current bandwidth resource is allowed to be authorized, and if so, authorize, record the authorization information or the downlink MPCP type in the GIT, otherwise, go to step 404.
- the determination of whether the bandwidth resource is allowed, for the EF, MF, and MPCP services, is based on the port assignment bandwidth, that is, the amount of data allowed to be transmitted in a virtual frame period (for EF, MF services) or fixed data of MPCP.
- the quantity (for the MPCP service) and the remaining bandwidth in the current virtual frame period are judged. When the current one is larger than the latter, the bandwidth resource allows, and the authorization can be performed.
- the bandwidth resource is allowed to be allowed.
- the amount of the transmitted data of the assignment may be replaced by a transmission quantum that is queried in the BIT table by using an index of the ONUID and the Offset.
- the bandwidth resource is allowed to be judged only when the port has pending data reporting and the remaining transmittable data amount is not less than the largest of the reported data volume and the bandwidth assignment data volume.
- the amount of the transmitted data of the assignment may be replaced by the transmitted quantum that is queried in the BIT table by using the indexes of the ONU1D and the Offset.
- the current port is authorized, and the authorization information is recorded in the GIT.
- the protection band that needs to be added according to the predetermined data arrival timestamp and the previous port in the virtual frame period is determined, and the data transmission start time (Start Time) and the data transmission length (Length) are determined. And recorded in the corresponding entry of the corresponding port of the GIT of this type of service.
- the predetermined data arrival timestamp refers to a time identifier of data arrival in a predetermined next uplink virtual frame period, and the reference standard of the time identifier is a free oscillation clock at 0LT.
- the downlink MPCP message type is determined according to the RIT uplink message type of the current MPCP port; for the automatic discovery of the MPCP message service, the downlink message type is a fixed type. Then, the MPCP type and the authorization flag are written in the GIT entry corresponding to the MPCP port. For the automatic discovery of the MPCP message service, the authorization flag can be written only to the GIT entry corresponding to the MPCP port.
- the data is granted according to the data length information reported in the port RIT, that is, the window corresponding to the length is granted, and the authorized window is written into the corresponding GIT entry.
- the window corresponding to the length is authorized, and the new authorized deficit is calculated, and the authorized window and the authorized deficit are written into the corresponding GIT. In the table entry.
- Step 403 Update remaining bandwidth in the current virtual frame period and information related to the current to-be-authorized port.
- the method includes: updating a remaining bandwidth in a current virtual frame period; updating a current scheduled data arrival timestamp in the EF service and a remaining bandwidth in the virtual frame period; clearing an automatic discovery MPCP startup counter, and directly returning the MPCP for this purpose Step 401; Clear the report flag in the RIT table corresponding to MPCP, MF, AF, and DF. The flag of the RIT table is cleared to avoid duplicate authorization in the next virtual frame period.
- the authorization scheduling method of the AF service uses a leaky bucket type algorithm.
- the authorization scheduling of the AF service may also employ a weighted round robin algorithm without affecting the spirit and scope of the present invention.
- Step 404 Determine whether there is a port unauthorized. If yes, return to step 401; otherwise, end the port authorization of the priority service and enter the port authorization process of the next priority service.
- the determining process for the MF and the non-automatic discovery of the MPCP specifically determines whether the currently polled service activates the ONU Bitmap register to have an unread entry. If yes, the port of the ONU is not authorized; otherwise, Explain that the authorization for this type of business has been completed. Correct For services in the port area, such as EF, AF, and DF, first determine whether the currently polled service activation port Bitmap table has an unread entry. If yes, continue to query the next entry of the table. entry, otherwise, continue to determine the current entry service activation ONU Bitmap register if there has not been read, and if so, then there is ONU port is not authorized; No shellfish 1 J, explained authorize such operations have been completed .
- step 404 For the automatic discovery of the MPCP, since the virtual frame period is only one authorization at a time, the judgment process of step 404 is not performed, and the authorization of the next priority service port is directly entered.
- Figure 5 shows the data structure of the vMAC grant information table GIT, each entry corresponding to the authorization information of each ONU port, and the system is indexed by the ONUID.
- the entry contains the Granted Flag, the start time of the data transmission, and the length of the data transmission.
- the authorization flag indicates whether the service port is authorized.
- the data transmission start time is the time when the port is authorized to start sending.
- the data transmission length is the length of the authorization window, which refers to the length that the port is granted to send data.
- the entry contains the Granted Flag, the Reserved field, the Length of the data, and the reserved field, which is not yet defined, and can be reserved for future use.
- the entry contains the Granted Flag, the Downstream MPCP Message Type (Type), and the Reserved Domain (Reserved).
- the downlink MPCP message type includes "Discovery GATE”, “Normal GATE”, “REGISTER&GATE”, where the downlink MPCP of type "GATE” is used exclusively for carrying authorization messages.
- the entry contains the Granted Flag, Deficit Cnt, and Length.
- the deficit counter is used to record the authorized deficit of the port, and the authorized deficit reflects the service port in the previous
- the accumulated authorization bandwidth in the service period is more than the reported bandwidth.
- the system balances the QoS guarantee of the AF and DF services by authorizing the deficit. For the DF service, since the authorized deficit is not considered, the value of the counter can be owed. Set to zero.
- the authorization phase of the service port of the ONU only the transmission start time of the EF service authorization data is used; in other services, the registration window of the MPCP is automatically found to be determined for the number of ONUs and the PON system determined by the longest extension distance; Since the MPCP message length is fixed, the MPCP message length is also fixed, and their authorization length is no longer written in the authorization information table; the authorization length of the AF and DF service ports is not fixed to be written in the authorization information table.
- the present invention also sets an ONU Status Information Table (SIT) for characterizing the status information of the ONU.
- SIT ONU Status Information Table
- Figure 6 shows the data structure of the status information table.
- Each ONU corresponds to an entry. The system is indexed by the ONUID, and the entry contains ONU status information (ONU Status).
- the ONU status information is represented by 2 bits, which are invalid (Invalid Entry), Registered ONU, and Registered ONU.
- the invalidation indicates that the ONUID is not assigned to any ONU; the registration indicates that the ONU has completed the registration process, and the service data can be forwarded normally; the registration indicates that the ONU is in the registration process, and the specific current interaction of the ONU is in the registered state.
- the message can be learned by reporting the information table RIT entry and the authorization information table GIT entry on the MPCP port of the ONU.
- the ONU status information table entry is generated according to the interacting MPCP message during the MPCP message interaction process.
- the current state of the ONU depends on the MPCP message exchanged between the OLT and the ONU in the previous state and the previous state, for example: when in the ONU In the invalid state, if the ONU receives the automatic registration MPCP message (Discovery GATE) of the OLT and issues a registration request (REGISTER_REQ) MPCP message, the ONU state is changed to the registration. When the ONU is in the registered state, if it receives REGISTER_ACK, it will be converted to the registered state.
- the OLT After completing the service transmission authorization operation, the OLT will generate an authorization message in the virtual frame period and send an authorization message to the corresponding ONU at a certain time.
- the principle of authorization message generation is as follows: In order to generate as few authorization messages as possible for each ONU's port service, it is also to insert less ONU protection bands and synchronization time periods in the upstream data stream, except for EF, other port services.
- the authorization transmission window is immediately adjacent to each other, so the authorization data transmission start time of the ports other than the EF is determined in the authorization message generation phase and written in the authorization message. This is because the EF service requires low latency and low latency jitter.
- the strategy adopted for these ports is to send the timing as much as possible.
- the EF service port determines the authorized transmission start time and the authorized transmission length in the authorization information generation phase.
- the authorized transmission length is determined in the authorization information generation phase, and the authorization transmission start time is determined in the authorization message generation phase. The purpose of this is to make the ports of the same ONU as close as possible to the authorized transmission window time, thereby reducing the insertion of the guard band and improving the bandwidth utilization.
- FIG. 7 shows a flow of an authorization message generating method according to an embodiment of the present invention.
- the ONU status information table entry is read one by one according to the ONUID index.
- the system performs authorization message generation in the ONU unit, so that the authorization message is carried in the downlink MPCP message of the type "GATE", and can handle the unified authorization of the service port of the same ONU.
- step 702 it is determined whether the current ONU is invalid, that is, whether the ONU status information of the ONU status corresponding to the current ONUID is 00. If yes, the authorization is not performed, and the status information table is further read, and the process proceeds to step 701; otherwise, If the ONU status information of the current ONUID is ON or 10, the process proceeds to step 703.
- Step 703 Read the GIT table corresponding to each port of the current ONU, generate authorization information, and determine a data sending start time.
- the process includes: searching for an entry corresponding to the port of the same ONU according to the ONUID index in the GIT table, and searching for the authorized port according to the authorization flag, and obtaining the authorization status of the service port. If the service port is authorized, the slave correspondence table is obtained. In the item, the relevant information such as the length of the authorization data is taken out, and the data transmission start time is determined.
- the corresponding data entry of the GIT table is obtained, and the authorized data length and the sending start time are obtained and written into the GATE downlink MPCP message.
- the MPCP message type is obtained by querying the GIT table.
- the authorization data length is fixed, it is only necessary to send the timestamp of the authorized scheduled data inherited according to the service data transmission authorization phase, and determine the authorization data transmission of each service port. Start time.
- the authorized data transmission length is obtained by querying the GIT table, and the authorized scheduled data transmission timestamp inherited by the service data transmission authorization phase is used to determine the authorization data transmission of each service port. Start time.
- Step 704 Generate an authorization message according to the authorization information and the authorization data sending start time, and send the authorization message.
- the system carries the authorization information and the authorization data transmission start time of each authorized port of the current ONU through the GATE downlink MPCP message.
- the type of the MPCP message sent by the downlink OLT to the ONT is determined according to the type of the authorized MPCP message. If the MPCP message of the GATE type is included, the authorization information and the authorization data transmission start time determined in step 703 are written into the GATE downlink MPCP. Sent in the message.
- a G ⁇ TE downlink MPCP message can carry the authorization information of four ports and the start time of the authorization data transmission. Therefore, if the current ONU needs to authorize more than four ports, two or more GATE downlink MPCPs are generated. Message, to carry all; ⁇ authorized port authorization information and authorization data transmission start time.
- Step 705 Set an authorization flag indication in the GIT entry corresponding to the current authorized port. Authorized to avoid repeated delivery of authorization messages.
- Step 706 Determine whether all state information table entries have been read. If yes, it indicates that all ONU authorization messages have been generated, and the authorization message generation process of the virtual frame period is ended; otherwise, return to step 701 to continue to read the status information. table.
- the present invention provides a method for processing an offline ONU or a fault ONU, that is, an ONU information aging process.
- the system sets the ONU activation timeout count table to count the non-response time of each ONU. If the count value exceeds the specified offline threshold, it determines that the ONU is invalid and releases the resources of the invalid ONU.
- FIG 8 shows the data structure of the ONU activation timeout count table.
- Each ONU corresponds to an entry.
- the system is indexed by the ONUID.
- the entry contains the report flag (Reported) and the activation timeout counter (ATC, Active Timeout Count).
- FIG. 9 shows a flow of an ONU information aging method according to an embodiment of the present invention.
- the system reads an ONU status information table entry one by one according to an ONUID index.
- Step 902 Determine whether the current ONU is invalid. If yes, return to step 901, do not process the invalid ONU, and continue reading downward; otherwise, proceed to step 903.
- Step 903 Read an activation timeout count table entry corresponding to the ONU, and proceed to step 904.
- Step 904 The system determines, according to the report flag in the current read entry, whether the ONU reports the MPCP message in the virtual frame period, and if yes, clears the activation timeout counter in the current entry; otherwise, the activation timeout The counter performs a counting operation. Also, regardless of the result of the judgment, the operation of clearing the report flag (Reported) is performed.
- Step 905 Determine whether the activation timeout counter count value exceeds an offline threshold. If yes, it indicates that the ONU is offline, and proceeds to step 906; otherwise, indicates that the ONU is online, and proceeds to step 907.
- Step 906 setting an ONU status information table entry corresponding to the ONU to an invalid state, and The related resources of the ONU are released, and the process proceeds to step 907.
- the system does not set the corresponding entry in the status information table, indicating that the ONU does not exist.
- the released ONU related resource includes: a service activation Bitmap register IMPAB, IMFAB, IEFAB, IAFAB, IDFAB corresponding bit, a service activation Bitmap table IEFAT, IAFAT, IDFAT corresponding entry, a corresponding entry of the bandwidth information table, And the ONUID originally assigned to the ONU.
- Step 907 Determine whether all entries of the ONU state information table have been read, and if yes, end the ONU information aging process of the virtual frame period; otherwise, return to step 901 to continue reading the state information table.
- the aging process may be performed repeatedly.
- the aging process of the entire ONU information entry may be initiated by an event, and the aging process traverses all the entries to perform aging processing on all the entries, and all the entries are traversed. When it is finished, it ends, waiting for the next event to start the process again.
- the present invention is applicable to a master-slave system in which an OLT controls an ONU to access.
- the OLT controls the forwarding of all uplink service data of the ONU to include MPCP or other MAC messages.
- the data is transmitted and received at the ONU.
- the transmission scheduling may also be based on priority, and the downlink scheduling and forwarding are performed in the priority order of EF, MPCP, CPU/OAM, AF, and DF.
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Priority Applications (10)
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CA2542163A CA2542163C (en) | 2003-10-21 | 2004-10-21 | Method for dynamic bandwidth allocation in passive optical network |
ES04789854T ES2373442T3 (es) | 2003-10-21 | 2004-10-21 | Método de asignación dinámica del ancho de banda en una red óptica pasiva. |
AU2004307061A AU2004307061B2 (en) | 2003-10-21 | 2004-10-21 | Dynamic bandwidth distribution method in passive optical network |
DK04789854.9T DK1684447T3 (da) | 2003-10-21 | 2004-10-21 | Fremgangsmåde til dynamisk fordeling af båndbredde i passivt optisk netværk |
PL04789854T PL1684447T3 (pl) | 2003-10-21 | 2004-10-21 | Sposób dynamicznego przydzielania przepustowości łącza w pasywnej sieci optycznej |
AT04789854T ATE528870T1 (de) | 2003-10-21 | 2004-10-21 | Dynamisches bandbreitenverteilungsverfahren in einem passiven optischen netzwerk |
JP2006535931A JP2007509545A (ja) | 2003-10-21 | 2004-10-21 | パッシブ光ネットワーク(pon)における動的なバンドワイズ割当ての方法 |
BRPI0415843A BRPI0415843B1 (pt) | 2003-10-21 | 2004-10-21 | método para alocaçao dinâmica de largura de banda em rede óptica passiva |
US10/576,520 US7720072B2 (en) | 2003-10-21 | 2004-10-21 | Method for dynamic bandwidth allocation in passive optical network |
EP04789854A EP1684447B1 (en) | 2003-10-21 | 2004-10-21 | Dynamic bandwidth distribution method in passive optical network |
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EP (1) | EP1684447B1 (zh) |
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CN (1) | CN1326340C (zh) |
AT (1) | ATE528870T1 (zh) |
AU (1) | AU2004307061B2 (zh) |
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CA (1) | CA2542163C (zh) |
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RU2722434C1 (ru) * | 2016-11-23 | 2020-05-29 | Хуавэй Текнолоджиз Ко., Лтд. | Система пассивной оптической сети, терминал оптической линии и оптический сетевой блок |
US10756841B2 (en) | 2016-11-23 | 2020-08-25 | Huawei Technologies Co., Ltd. | System for registering an ONU to an OLT in a passive optical network system using a dedicated wavelength |
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Also Published As
Publication number | Publication date |
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EP1684447A1 (en) | 2006-07-26 |
EP1684447B1 (en) | 2011-10-12 |
KR100698571B1 (ko) | 2007-03-21 |
CA2542163A1 (en) | 2005-04-28 |
CN1326340C (zh) | 2007-07-11 |
ATE528870T1 (de) | 2011-10-15 |
CA2542163C (en) | 2010-11-30 |
ES2373442T3 (es) | 2012-02-03 |
US20070140258A1 (en) | 2007-06-21 |
US7720072B2 (en) | 2010-05-18 |
BRPI0415843B1 (pt) | 2018-10-09 |
JP2007509545A (ja) | 2007-04-12 |
PL1684447T3 (pl) | 2012-03-30 |
BRPI0415843A (pt) | 2007-01-02 |
CN1610279A (zh) | 2005-04-27 |
AU2004307061A1 (en) | 2005-04-28 |
PT1684447E (pt) | 2011-12-26 |
EP1684447A4 (en) | 2007-01-24 |
RU2320089C1 (ru) | 2008-03-20 |
BRPI0415843A8 (pt) | 2017-10-03 |
DK1684447T3 (da) | 2012-01-16 |
KR20060080590A (ko) | 2006-07-10 |
AU2004307061B2 (en) | 2007-11-01 |
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