CN1897760A - Method for discovering dynamic band width distributing ability and configuring parameter based on timer - Google Patents
Method for discovering dynamic band width distributing ability and configuring parameter based on timer Download PDFInfo
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Abstract
The method comprises: in the OA&M (operation, administration and maintenance) message expanded by a specified organization, setting the threshold of the queue set numbers supported by optical network unit (ONU) and the threshold of length of each queue in said queue set, for use in the data transmission and configuration between the OLT (optical line terminal) and the ONU; according to the preset thresholds above, the ONU sets the queue set field presenting the queue length and the queue set numbers in the REPORT frame of the multi point control protocol; the ONU reports the REPORT frame to the OLT; according to the numbers of uplink queue set and the length of each queue, the OLT authorizes the uplink bandwidth allocated by OLT. The invention can make the dynamic bandwidth allocation in the passive optical network and solves the intercommunication problem between ONU and OLT provided by multi venders.
Description
Technical field
The present invention relates to optical fiber and insert the field, relate in particular to a kind of discovering dynamic band width distributing ability and method for parameter configuration that is used for the Ethernet passive optical network system.
Background technology
Go into bandwidth with new business such as IPTV, new interface applications and have higher requirement along with developing rapidly of internet, optical fiber inserts the inevitable direction that becomes the broadband access network development.Consider that from the maturity and the operation cost of technology Ethernet passive optical network (EPON) is the main realization means that optical fiber inserts, and also is the most potential access technology.
Because the EPON system adopts the topological structure of the point of bandwidth sharing to multiple spot, each optical line terminal (OLT) connects a plurality of optical network units (ONU) by Optical Distribution Network (ODN), send to carry out downlink broadcast, on the up link from the optical network unit to the optical line terminal, adopt time division multiple access to insert the mode of (TDMA), come coordination data effectively to send and reception with Multi-point Control Protocol (MPCP) agreement, guarantee that up direction only allows an ONU transmission professional at any time in system's running.
In the MPCP agreement, mainly defined the protocol Data Unit (MPCPDU) of 5 multiple spot agreements, thereby what be used for wherein that the state of reporting uplink formation makes that optical line terminal can carry out Dynamic Bandwidth Allocation mainly is this protocol Data Unit of PEPORT.Defined the Dynamic Bandwidth Allocation (DBA) that 2 modules are used to realize up direction in the MPCP agreement, that is: report is handled and the gating processing.ONU utilizes the REPORT frame to report the state of its upstream queue to OLT, and then sends bandwidth request at up direction to OLT.OLT basis and the service-level agreement (SLA) of this ONU signature and the bandwidth request of this ONU utilize specific algorithm computation to give the upstream bandwidth mandate (Grant) of this ONU issue, with the upstream bandwidth of dynamic each ONU of control.This specific algorithm is an algorithm well known in the prior art.
At present, in IEEE 802.3ah standard, stipulate, in the REPORT message frame that ONU sends a plurality of formation collection (Queue Set) can be set, concentrate the length information that comprises corresponding to all formations of this formation collection in each formation.The main purpose that the formation collection is set is to wish to think that for the DBA server among the OLT provides ethernet frame configuration information in the more detailed ONU formation calculating of DBA provides higher precision and efficient among the OLT.But, 802.3ah do not have definite definition to the dequeue collection, filling content for the report of individual queue under a plurality of formation collection situations is not clear and definite yet, so there is different implementations in each chip manufacturer at present, and then cause the EPON equipment can't intercommunication, the lighter causes communication efficiency to reduce, and weight person causes the business can't intercommunication.
In order to realize the interoperability of multi-vendor ONU and OLT, must carry out detailed unified regulation to the filling content of REPORT frame format and each field.In addition, in order the DBA report ability of ONU to be found and is realized the configurable of DBA parameter in the REPORT frame of ONU to have a mechanism to realize DBA ability discovery and parameter configuration.
Therefore, urgently need a kind of Dynamic Bandwidth Allocation that can either realize in the Ethernet passive optical network in the prior art, can solve the technology of the inter-communicating problem of multi-vendor ONU and OLT again.
Summary of the invention
One of purpose of the present invention provides a kind of Dynamic Bandwidth Allocation that can either realize in the Ethernet passive optical network, can solve the technology of the inter-communicating problem of multi-vendor ONU and OLT again.
In order to realize the interoperability of multi-vendor ONU and OLT, must unify regulation to the filling content of REPORT frame format and each field, and must there be a mechanism to find and this ability is configured to the DBA report ability of ONU, and make this mechanism carry out standard to content and each field of how to fill the REPORT frame, thereby make the ONU of different vendor and OLT can utilize this standard to fill the REPORT frame format jointly, provide a common basis for OLT carries out Dynamic Bandwidth Allocation, make to solve the Dynamic Bandwidth Allocation problem under the prerequisite of intercommunication at different ONU and OLT.
One of solution of the present invention is: a kind of dynamic bandwidth ability discovery and method for parameter configuration comprise:
In the Operations, Administration and Maintenance message of particular organization expansion, place the formation collection quantity of optical network unit support and the threshold value of each queue length that formation is concentrated, be used between optical line terminal and optical network unit, carrying out transmission, the setting of DBA parameter;
The threshold value of each queue length that optical network unit is concentrated according to the formation collection quantity that sets and formation is placed the formation collection field and the formation collection quantity of expression queue length in the REPORT of Multi-point Control Protocol frame;
Optical network unit is reported optical line terminal with the REPORT frame that this has formation collection field and formation collection quantity, and optical line terminal is given the upstream bandwidth mandate that distributes for optical network unit according to upstream queue collection quantity and each queue length.
Wherein the Operations, Administration and Maintenance message specific to the expansion of mechanism comprises following four kinds of message: Dynamic Bandwidth Allocation parameter request message; Dynamic Bandwidth Allocation parameter response message, Dynamic Bandwidth Allocation parameter setting request message, Dynamic Bandwidth Allocation parameter are provided with acknowledge message.
The Payload territory of wherein said four kinds of message has extended operation sign indicating number, the Dynamic Bandwidth Allocation command code that identifies concrete Dynamic Bandwidth Allocation parameter action type and the unified structure of data/filling field of mechanism's unique identifier, sign extended operation type, and data/filling field is used to describe concrete Dynamic Bandwidth Allocation parameter.
The concrete form of wherein said four kinds of message is respectively:
Described Dynamic Bandwidth Allocation parameter request message comprises the extended operation sign indicating number of mechanism's unique identifier, sign extended operation type, Dynamic Bandwidth Allocation command code, the byte of padding of Dynamic Bandwidth Allocation parameter action type that sign is concrete;
Described Dynamic Bandwidth Allocation parameter response message comprises mechanism's unique identifier, the extended operation sign indicating number of sign extended operation type, identify the Dynamic Bandwidth Allocation command code of concrete Dynamic Bandwidth Allocation parameter action type, be used for describing the formation collection amount field of the REPORT frame formation collection quantity that optical network unit sends, be used for indicating the formation collection field of REPORT frame to comprise the report bitmap field of which formation, be used for indicating the queue thresholds field of the threshold value of the individual queue that the formation collection field of REPORT frame comprises, byte of padding;
Described Dynamic Bandwidth Allocation parameter setting request message comprises mechanism's unique identifier, the extended operation sign indicating number of sign extended operation type, identify the Dynamic Bandwidth Allocation command code of concrete Dynamic Bandwidth Allocation parameter action type, be used for the formation collection amount field that the formation collection quantity of REPORT frame that optical network unit is sent is provided with, be used for the formation collection field of REPORT frame is comprised the report bitmap field which formation is provided with, be used for the individual queue threshold field that the threshold value of the individual queue that the formation collection field to the REPORT frame comprises is provided with, byte of padding;
Described Dynamic Bandwidth Allocation parameter is provided with acknowledge message and comprises mechanism's unique identifier, the extended operation sign indicating number of sign extended operation type, identify the Dynamic Bandwidth Allocation command code of concrete Dynamic Bandwidth Allocation parameter action type, the setting of expression Dynamic Bandwidth Allocation parameter whether success the affirmation field is set, be used for confirming the formation collection amount field of setting of quantity of the formation collection of REPORT frame that optical network unit is sent, be used for confirming that formation collection field to the REPORT frame comprises the queue thresholds field that report bitmap word which formation is provided with is provided with, byte of padding.
Wherein the threshold value of each queue length of concentrating according to the formation collection quantity that sets and formation of optical network unit is placed formation collection quantity and is represented that the process of formation collection field of queue length is as follows in the REPORT of Multi-point Control Protocol frame:
In the REPORT frame, place the following content of the formation collection quantity-1 set group: report bitmap, formation #0 report, formation # 1 report ... formation #n report ... formation #m reports repetition, n＜m wherein, n and m are natural number, formation #n report expression formation n is engraved in the total length of the complete ethernet frame of this formation under the condition that is lower than the pairing length threshold of this formation and required frame period and forward error correction expense thereof when the REPORT frame produces, last formation collection of this REPORT frame is used to fill in whole length of all formations.
Wherein the queue length value of formation #n report adopts bulk billing system.
The queue length value of the formation #n report that wherein a plurality of formations are concentrated is taked incremental mode: for specific formation #n, the queue length value minimum of the formation #n report that first formation in the REPORT frame is concentrated, along with the increase of formation collection sequence number, the queue length value of formation #n report is increasing.
The present invention also provides a kind of optical network unit, has the following function module: the module of setting of transmitting and be received in the threshold value of each queue length that the formation collection quantity in the Operations, Administration and Maintenance message of particular organization expansion optical network unit supported and formation concentrate; Send the threshold value of each queue length of concentrating according to formation collection quantity that sets and formation and the module of having placed the REPORT frame of the formation collection field of expression queue length and formation collection quantity to optical line terminal; Receive optical line terminal to module for the mandate of the upstream bandwidth of optical network unit distribution.
The present invention also provides a kind of optical line terminal, has following functional module: the module that adopts the threshold value of each concentrated formation of particular organization Operations, Administration and Maintenance message request of expanding and the formation collection quantity that the optical network unit support is set and formation; Receive each queue length threshold of concentrating according to formation collection quantity that sets and formation and the module of having placed the REPORT frame of the formation collection quantity of expression queue length and formation collection field from optical network unit; The module according to upstream queue collection quantity and each queue length to authorizing for the upstream bandwidth of optical network unit distribution.
Because the present invention is in the operation of particular organization expansion, administer and maintain in the message, place the formation collection quantity of optical network unit support and the threshold value of each queue length that formation is concentrated, a mechanism has so just been arranged, can find and this ability is configured the DBA report ability of ONU, also can utilize this mechanism that content and each field of how to fill the REPORT frame are carried out standard, the threshold value of each queue length of concentrating according to the formation collection quantity that sets and formation of optical network unit is then placed the formation collection field of formation collection quantity and expression queue length in the REPORT of Multi-point Control Protocol frame.Utilize this unified mechanism, optical line terminal just can obtain the state of upstream queue uniformly, thereby give the upstream bandwidth mandate that distributes for optical network unit in view of the above, thereby both realized the Dynamic Bandwidth Allocation in the Ethernet passive optical network, and utilized this unified mechanism to solve the inter-communicating problem of multi-vendor ONU and OLT again.
Description of drawings
Fig. 1 is the schematic diagram of the REPORT frame format that adopts among the present invention.
Fig. 2 is the frame format figure of the get_DBA_request Operations, Administration and Maintenance protocol Data Unit that adopts among the present invention.
Fig. 3 is the frame format figure of the get_DBA_response Operations, Administration and Maintenance protocol Data Unit that adopts among the present invention.
Fig. 4 is the frame format figure of the set_DBA_request Operations, Administration and Maintenance protocol Data Unit that adopts among the present invention.
Fig. 5 is the frame format figure of the set_DBA_response Operations, Administration and Maintenance protocol Data Unit that adopts among the present invention.
Fig. 6 is the flow chart of Dynamic Bandwidth Allocation parameter management, comprises the flow process of configuration of the DBA parameter of the announcement of DBA parameter of ONU and ONU.
Fig. 7 is the module composition diagram according to optical network unit of the present invention.
Fig. 8 is the module composition diagram according to optical line terminal of the present invention.
Embodiment
The invention provides a kind of dynamic bandwidth ability discovery and method for parameter configuration, comprising:
(1) in the Operations, Administration and Maintenance message of particular organization expansion, place the formation collection quantity of optical network unit support and the threshold value of each queue length that formation is concentrated, be used between optical line terminal and optical network unit, transmitting, being provided with.
In the international standard IEEE802.3ah of EPON, stipulated a kind of Operations, Administration and Maintenance (OAM) function, be used to realize link monitoring and loop fuction.Simultaneously, this standard definition a kind of particular organization expansion (Orgnization-Specific Extension) mechanism so that each manufacturer and operator define more OAM(Operation Administration Maintenance).Particular organization expansion OAM(Operation Administration Maintenance) is to realize by the OAM Protocol Data Unit of particular organization expansion.The present invention has defined the OAM Protocol Data Unit of particular organization expansion, with DBA ability discovery and the management of DBA parameters remote of carrying out ONU.
The management attribute of DBA comprises formation collection quantity and the concentrated pairing threshold value of formation of each formation that the REPORT frame of ONU is supported.The OAM expansion that DBA consults relates generally to the quantity of the formation collection that will support ONU and the threshold value of individual queue is operated (read and be provided with).
In the DBA of ONU parameter configuration process, OLT should be operated in initiatively (Active) pattern, pattern that ONU is operated in passive (Passive).OLT reads and setting operation by get_DBA_request message and the set_DBA_request message DBA parameter to ONU, and ONU makes the request of reading with setting operation of OLT by get_DBA_response message and set_DBA_response message and replying.(the following concrete frame format that can introduce get_DBA_request message and set_DBA_request message, get_DBA_response message and set_DBA_response message particularly).
As described in Figure 6, OLT sends get_DBA_request message to ONU, after ONU receives get_DBA_request message, should send get_DBA_response message to OLT, comprise its current DBA parameter value in this message, the DBA parameter value comprises the formation collection quantity of the optical network unit support that sets and the threshold value of each queue length that formation is concentrated.
When OLT need send set_DBA_request message to ONU when ONU is provided with the Dynamic Bandwidth Allocation parameter.After ONU receives set_DBA_request, should local DBA parameter be set according to the defined DBA parameter of set_DBA_request message, and send set_DBA_response message, whether finished this DBA parameter setting to confirm it.
Like this, by in the Operations, Administration and Maintenance message of particular organization expansion, placing the Dynamic Bandwidth Allocation parameter, especially the threshold value of each queue length of concentrating of the formation collection quantity supported of optical network unit and formation, just finished the discovery of ability that the DBA of ONU is reported, and be that the DBA parameter that disposes in the REPORT frame is later on laid a good foundation.
The present invention definition is used for Payload (Payload) part of OAM Protocol Data Unit of the particular organization expansion of DBA parameter management and is made up of the Dynamic Bandwidth Allocation command code and the data/fields such as filling of the extended operation sign indicating number of mechanism's unique identifier (OUI), sign extended operation type, Dynamic Bandwidth Allocation parameter action type that sign is concrete, data/filling field is used to describe concrete Dynamic Bandwidth Allocation parameter, and the concrete form of this Payload is as shown in table 1 below:
● OUI is the OUI that the IEEE of standard distributes, and its value is relevant with the provider or the operator of EPON equipment.
● length is that the value of the extended operation sign indicating number (Ext.Opcode) of 1 byte is " Ox0A " (can certainly adopt other values).
● length is the needed type of message of DBA parameter configuration function that the DBA operation code field of a byte further identifies ONU.
● the indefinite length of data/filling field is used to fill and operates relevant data or be used for filling.
| Byte number | Load | Value | Note | |
| 3 | OUI | 0xXX XX XX | This value waits to apply for, should be configurable | |
| 1 | Extended operation sign indicating number (Ext. Opcode) | 0x0A | The | |
| 1 | The DBA sign indicating number | The 0x00-0x03:DBA administrative messag; 0x04-0xFF: reserve code, do and ignore processing | The get/set configuration operation | |
| Variable | Data/filling | Relevant with concrete DBA action type |
Table 1 is used for the form of the Orgnization-Specific Extension OAM message payload part of DBA
The DBA sign indicating number of table 1 part is concrete to adopt any among the 0x00-0x03, can stipulate with reference to following table 2:
| Bit | Definition | Describe |
| [7∶2] | Keep | Default value is complete 0 |
| [1∶0] | Message coding | 00-DBA parameter request frame (get_DBA_request) 01-DBA parameter response frame (get_DBA_response) 10-DBA parameter is provided with claim frame (set_DBA_request) 11-DBA parameter acknowledgement frame (set_DBA_response) is set |
The value in DBA Code territory and corresponding type of message thereof in the table 2 Orgnization-Specific Extension OAM message
Be that 0x00 represents get_DBA_request, 0x01 represents get_DBA_response, and 0x10 represents set_DBA_request, and 0x11 represents set_DBA_response.
Should be appreciated that above only is a kind of example.Such as not necessarily representing the DBA command code with 0x00-0x03, be set to 4 kinds in the Operations, Administration and Maintenance message of particular organization expansion discussed above, but also may not 4 kinds, as long as it is just passable to place the threshold value of each queue length that formation collection quantity that optical network unit supports and formation concentrate in the Operations, Administration and Maintenance message of particular organization expansion.Therefore, as more than 4 kinds or when being defined, just distinguish just passable with DBA command code not of the same race less than 4 kinds Operations, Administration and Maintenance message specific to the expansion of mechanism.
Form to Operations, Administration and Maintenance (OAM) message of the particular organization expansion of the described 4 kinds DBA parameter configuration that are used for ONU defines below.Wherein, DBA parameter request frame and DBA parameter response frame are realized the discovery and the parameter query of the DBA ability of ONU.Claim frame is set the DBA parameter and the DBA parameter is provided with the configuration management of acknowledgement frame realization to the DBA parameter of ONU.
Being defined as follows of these four kinds of message:
1) DBA parameter request frame (get_DBA_request)
OLT utilizes DBA parameter request frame indication ONU to report its current DBA parameter (the Queue Set quantity in the REPORT frame and the threshold value of each formation).The structure of DBA parameter request OAMPDU as shown in Figure 2, wherein some field is some the general fields that have nothing to do with the present invention, therefore, mainly below introduces some fields relevant with the present invention:
A) mechanism's unique identifier (OUI): 3 bytes, comprise 24 bit architecture unique identifiers, concrete OUI value is undetermined;
B) extended operation sign indicating number (Ext.Opcode): 1 byte, be used to identify the action type of expansion, for the OAMPDU of the expansion that is used for the DBA parameter configuration, its value is " 0x0A ";
C) DBA command code: 1 byte, be used to identify concrete DBA parameter action type, for get_DBA_request message, its value is " 0x00 ";
D) byte of padding (PAD): 0～30 byte, the residue field that is used for filling this OAM frame makes the total length of this OAM frame reach 64 bytes, and filling content is " 0x00 ".
2) DBA parameter response frame (get_DBA_response)
ONU utilizes DBA parameter response frame to report its current DBA parameter (the formation collection quantity in the REPORT frame and the threshold value of each formation) to OLT.The structure of DBA parameter response frame as shown in Figure 3, the detailed of field wherein related to the present invention is defined as follows:
A) mechanism's unique identifier (OUI): 3 bytes, comprise 24 bit architecture unique identifiers, concrete OUI value is undetermined;
B) extended operation sign indicating number (Ext.Opcode): 1 byte, be used to identify the action type of expansion, for the OAMPDU of the expansion that is used for the DBA parameter configuration, its value is " 0x0A ";
C) DBA command code: 1 byte, be used to identify concrete DBA parameter action type, for get_DBA_response message, its value is " 0x01 ";
D) formation collection quantity: 1 byte, be used for describing the quantity of the formation collection (Queue Set) of the REPORT frame that ONU sends, span is that " 0x02 " arrives " 0x04 ";
E) report bitmap: 1 byte is one 8 bit flag register, indicates to comprise which formation among the REPORTMPCPDU, and is as shown in table 3:
| Bit (bit) | Flag bit | Value and implication thereof |
| 0 | Formation 0 | 0-formation 0 report does not exist 1-formation 0 report to exist |
| 1 | | 0- |
| 2 | | 0- |
| 3 | | 0- |
| 4 | | 0- |
| 5 | Formation 5 | 0-formation 5 reports do not exist 1-formation 5 reports to exist |
| 6 | | 0- |
| 7 | Formation 7 | 0-formation 7 reports do not exist 1-formation 7 reports to exist |
Table 3 is used for the definition in report bitmap territory of the OAMPDU of DBA parameter management
F) threshold value of formation n (formation #n threshold value): 2 bytes, on the expression formation n, the length of this formation the threshold value that can not surpass;
G) byte of padding (PAD): 37 bytes, the residue field that is used for filling this OAM frame makes the total length of this OAM frame reach 64 bytes, and filling content is " 0x00 ".
3) the DBA parameter is provided with claim frame (set_DBA_Request)
OLT utilizes the DBA parameter that claim frame indication ONU is set its DBA parameter (the formation collection quantity in the REPORT frame and the threshold value of each formation) is set.The structure that the DBA parameter is provided with claim frame as shown in Figure 4, wherein relevant with the present invention the detailed of field is defined as follows:
A) mechanism's unique identifier (OUI): 3 bytes, comprise 24 bit architecture unique identifiers, concrete OUI value is undetermined;
B) extended operation sign indicating number (Ext.Opcode): 1 byte, be used to identify the action type of expansion, for the OAMPDU of the expansion that is used for the DBA parameter configuration, its value is " 0x0A ";
C) DBA command code: 1 byte, be used to identify concrete DBA parameter action type, for set_DBA_request message, its value is " 0x02 ";
D) formation collection quantity: 1 byte, be used for describing the quantity of the due formation collection of REPORT frame (Queue Set) that ONU sends, promptly want the quantity be arranged to, span is that " 0x02 " arrives " 0x04 ", and ONU should be provided with formation collection quantity in its REPORT frame according to this value;
E) report bitmap: 1 byte is one 8 bit flag register, indicates among the REPORTMPCPDU to comprise which formation, shown in top table 3.
F) formation n threshold value: 2 bytes, be illustrated on the formation n that formation concentrates, want this queue length of being arranged to the threshold value that can not surpass; The value of the queue #n threshold that the value of the queue #nthreshold that first formation is concentrated should be concentrated less than second formation, and the like;
G) byte of padding (PAD): 0～30 byte, the residue field that is used for filling this OAM frame makes the total length of this OAM frame reach 64 bytes, and filling content is " 0x00 ".
In addition, in the present embodiment, last Queue Set is used to fill in whole length of all formations in the REPORT frame format, and therefore, the quantity of the formation #n threshold value in the set_DBA_request frame is (formation collection quantity-1).
4) the DBA parameter is provided with acknowledgement frame (set_DBA_response) ONU and sends the DBA parameter to OLT and acknowledgement frame (set_DBA_response) is set to announce it whether DBA parameter is set successfully.The structure that the DBA parameter is provided with acknowledgement frame as shown in Figure 5, wherein relevant with the present invention the detailed of field is defined as follows:
A) mechanism's unique identifier (OUI): 3 bytes, comprise 24 bit architecture unique identifiers, concrete OUI value is undetermined;
B) extended operation sign indicating number: 1 byte, be used to identify the action type of expansion, for the OAMPDU of the expansion that is used for the DBA parameter configuration, its value is " 0x0A ";
C) DBA command code: 1 byte, be used to identify concrete DBA parameter action type, for set_DBA_response message, its value is " 0x03 ";
D) affirmation is set: 1 byte is used to represent whether the DBA parameter setting of ONU is successful; When (Nack) do not finished or be rejected to the value of Set ACK for the setting of " 0x00 " expression DBA parameter; When the value of Set ACK is finished (Ack) for the setting of " 0x01 " expression DBA parameter;
E) formation collection quantity: 1 byte, be used for describing the quantity (the DBA parameter is provided with the back) of the due formation collection of REPORT frame (Queue Set) of ONU, just by the quantity of the set formation collection that is set to of set_DBA_request frame, span is that " 0x02 " arrives " 0x04 ", and ONU should be provided with formation collection quantity in its REPORT frame according to this value;
F) report bitmap: 1 byte is one 8 bit flag register, indicates to comprise which formation (the DBA parameter is provided with the back) among the REPORTMPCPDU, shown in top table 3;
G) formation n threshold value: 2 bytes, be illustrated on the formation n that formation concentrates, this queue length the threshold value that can not surpass; The value of the formation #n threshold value that the value of the formation #n threshold value that first formation is concentrated should be concentrated less than second formation (if comprise more than 3 or 3 Queue Set), and the like;
H) byte of padding (PAD): 1～29 byte, the residue field that is used for filling this OAM frame makes the total length of this OAM frame reach 64 bytes, and filling content is " 0x00 ".
Annotate: because last formation collection is used to fill in whole length of all formations in the regulation REPORT frame format of front, therefore, the quantity of the formation #n threshold value in the set_DBA_request frame is (threshold set quantity-1).
The message interaction process of the DBA parameter management of ONU has been described in the front in conjunction with Fig. 6.As described in Figure 6, OLT sends get_DBA_request message to ONU, after ONU receives get_DBA_request message, should send get_DBA_response message to OLT.When OLT need send set_DBA_request message to ONU when ONU is provided with the Dynamic Bandwidth Allocation parameter.After ONU receives set_DBA_request, local DBA parameter is set, and sends set_DBA_response message.Because this process has had description in front, so do not give unnecessary details at this.
Four kinds of operations specific to the expansion of mechanism have been enumerated in the front, administer and maintain message, be get_DBA_request message, get_DBA_response message, (above-mentioned is the get_DBA_request frame for set_DBA_request message and set_DBA_response message, the get_DBA_response frame, set_DBA_request frame and set_DBA_response frame, but the frame here has identical implication with message), be not limited to this four kinds of message but do not invent, as long as it is just passable to transmit the threshold value of the formation collection quantity of optical network unit support and each queue length that formation is concentrated.Such as, can be arranged to two kinds of message get_DBA_request+response message, set_DBA_request+response message and get final product.In get_DBA_request+response, place the field of the length threshold of the field that can place the formation collection quantity of confirming back, individual queue, when OLT request ONU reported the DBA parameter, these fields were not filled out, as long as when from ONU when OLT returns, ONU just adds these fields; Place one in the set_DBA_request+response message affirmation field is set, when OLT carries out DBA when being provided with to ONU, this field is not filled out, and has only when ONU returns when confirming and just fills in.Say the field of length threshold of field, the individual queue of corresponding formation collection quantity for another example, can divide two kinds of message to inquire, confirm separately, know to above-mentioned four kinds of fields and carry out different names, its function class seemingly, but slightly having any different, all is possible modification, but their common feature is exactly to carry the formation collection quantity of optical network unit support and the threshold value of each queue length that formation is concentrated, as long as satisfy such condition, these frame formats can have different distortion.And the message flow process of Fig. 6 also can have different flow processs, such as ought be as mentioned above, when having adopted the Operations, Administration and Maintenance message that is different from the above four kinds expansion specific to mechanism, its flow process fully might be different, as long as but to transmit, be provided with the threshold value of each concentrated queue length of formation collection quantity that optical network unit supports and formation between optical line terminal and optical network unit just passable.
Therefore, this process of the present invention may be summarized to be: in the Operations, Administration and Maintenance message of particular organization expansion, place the formation collection quantity of optical network unit support and the threshold value of each queue length that formation is concentrated, be used between optical line terminal and optical network unit, transmitting, being provided with.
In one embodiment, the Operations, Administration and Maintenance message of described particular organization expansion includes but not limited to following four kinds of message: Dynamic Bandwidth Allocation parameter request message; Dynamic Bandwidth Allocation parameter response message, Dynamic Bandwidth Allocation parameter setting request message, Dynamic Bandwidth Allocation parameter are provided with acknowledge message.And the Payload territory of described four kinds of message wherein can be summarized as the extended operation sign indicating number that has mechanism's unique identifier, identifies the action type of expansion, the Dynamic Bandwidth Allocation command code that identifies concrete Dynamic Bandwidth Allocation parameter action type and the unified structure of data/filling field, and data/filling field is used to describe concrete Dynamic Bandwidth Allocation parameter.Specifically, the concrete form of described four kinds of message is respectively: described Dynamic Bandwidth Allocation parameter request message comprises the extended operation sign indicating number of the action type of mechanism's unique identifier, sign expansion, Dynamic Bandwidth Allocation sign indicating number, the byte of padding of Dynamic Bandwidth Allocation parameter action type that sign is concrete; Described Dynamic Bandwidth Allocation parameter response message comprises mechanism's unique identifier, the extended operation sign indicating number of the action type of sign expansion, identify the Dynamic Bandwidth Allocation command code of concrete Dynamic Bandwidth Allocation parameter action type, be used for describing the formation collection amount field of quantity of the formation collection of the REPORT frame that optical network unit sends, be used for indicating the formation collection field of REPORT frame to comprise the report bitmap field of the length of which formation, be used for indicating the queue thresholds field of threshold value of the formation collection field individual queue of REPORT frame, byte of padding; Described Dynamic Bandwidth Allocation parameter setting request message comprises mechanism's unique identifier, the extended operation sign indicating number of the action type of sign expansion, identify the Dynamic Bandwidth Allocation command code of concrete Dynamic Bandwidth Allocation parameter action type, be used for the formation collection amount field that the formation collection quantity of REPORT frame that optical network unit is sent is provided with, be used for the formation collection field of REPORT frame is comprised the report bitmap field which formation is provided with, be used for the queue thresholds field that the threshold value to the formation collection field individual queue of REPORT frame is provided with, byte of padding; Described Dynamic Bandwidth Allocation parameter is provided with acknowledge message and comprises the structure unique identifier, the extended operation sign indicating number of the action type of sign expansion, identify the Dynamic Bandwidth Allocation command code of concrete Dynamic Bandwidth Allocation parameter action type, the setting of expression Dynamic Bandwidth Allocation parameter whether success the affirmation field is set, be used for confirming the formation collection amount field of setting of the formation collection quantity of REPORT frame that optical network unit is sent, be used for confirming that the formation collection field to the REPORT frame comprises the report bitmap field which formation is provided with, be used for confirming the individual queue threshold field of the setting that the threshold value of the individual queue that the formation collection field to the REPORT frame comprises is carried out, byte of padding.
(2) threshold value of each queue length of concentrating according to the formation collection quantity that sets and formation of optical network unit is placed the formation collection field of formation collection quantity and expression queue length in the REPORT of Multi-point Control Protocol frame.
Mention in the background technology part, in IEEE 802.3ah standard, stipulate, in the REPORT message frame that ONU sends a plurality of formation collection (Queue Set) can be set, concentrate the length information that comprises corresponding to all formations of this formation collection in each formation.But prior art is not clear and definite for the filling content of the report of individual queue under a plurality of formation collection situations not to the definite definition of dequeue collection yet, so there is different implementations in each chip manufacturer at present.And the present invention is because in the process () in front, the threshold value of each queue length of concentrating for the formation collection quantity that should put in the REPORT frame and formation, between OLT and ONU, obtained interchange, just can come to place the formation collection in the PEPORT frame according to this formation collection quantity that sets (notes, in the present embodiment, to reserve whole length that last formation collection is used to fill in all formations in the REPORT frame format), and can be according to the threshold value of each concentrated queue length of formation, be lower than this threshold value ground and place the formation collection field of expression queue length, then in follow-up process, DBA server among the OLT just can think that the calculating of DBA provides higher precision and efficient among the OLT according to the ethernet frame configuration information that reflects in this PEPORT frame.
The a kind of of said process is implemented as follows: as shown in Figure 1, some fields not too relevant with the present invention are arranged in Fig. 1, just no longer discuss, below main field wherein related to the present invention is discussed.At the middle part of Fig. 1 as can be seen, depositing the formation collection quantity that consults according to the process in () in the formation collection amount field, this quantity is made as N, and there is N set of queues collection at the middle part of REPORT frame.In the REPORT frame, place the following content of the formation collection quantity N-1 group that sets: the report bitmap, formation #0 report, formation # 1 report ... formation #n report ... formation #m reports repetition, n＜m wherein, n and m are natural number (m=7 among Fig. 1, that is to say, each formation collection has 8 formations), formation #n report expression formation n is engraved in the total length of the complete ethernet frame of this formation under the condition that is lower than the pairing length threshold of this formation and required frame period and forward error correction expense thereof when the REPORT frame produces, last formation collection of this REPORT frame is used to fill in whole length of all formations.It more than is the particular content of N set of queues collection.Be to be understood that, the invention is not restricted to this concrete REPORT form, such as, can formation #0 not reported, formation # 1 report ... formation #n report ... formation #m arranges continuously, m can not be 7, can not establish last formation collection and be used to fill in whole length of all formations, this distortion is a lot, as long as this form satisfies " threshold value of each queue length of concentrating according to formation collection quantity that sets and formation; place the formation collection field and the formation collection quantity of expression queue length in the REPORT of Multi-point Control Protocol frame ", as long as because passed on the formation collection information and the formation collection quantity of expression queue length, OLT just can carry out Dynamic Bandwidth Allocation according to the length and the formation collection quantity of these formations.
In Fig. 1, in the REPORT frame, the formation collection promptly repeats N time part among Fig. 1, be used for the length of each formation, and its each length all is lower than the threshold value that is provided with in aforementioned (one) process.The formation #n report value that particular queue is concentrated is represented that formation n is engraved in and is not exceeded corresponding to the total length of the complete ethernet frame of this formation collection and required frame period and forward error correction (FEC) expense (if FEC enables) thereof under the prerequisite of the threshold value of this formation when report message produces.The queue length value of formation #n report should adopt accumulative total (Cumulative) mode, is illustrated under the different threshold values total length of the complete ethernet frame from the formation starting point to this threshold value and needed expense thereof.The queue length value of the formation #n report that a plurality of formations are concentrated should be taked increment (Incremental) mode: for specific formation #n, the queue length value minimum of the formation #n report that first formation in the REPORT frame is concentrated, along with the increase of formation collection sequence number, the queue length value of formation #n report is increasing.For last the formation collection in the REPORT frame, formation #n report should be described the total length of this formation.When the value of the total length of this formation (contain the total length of complete ethernet frame and required frame thereof at interval and FEC expense) during greater than 128Kbyte (2 maximums that eight bit byte can be described), then this formation #n report value is 65535TQ.
Alternatively, can be following requirement: OLT to OLT and ONU and should be able to support parsing, to be used for the dynamic assignment of ONU upstream bandwidth the state information of whole 8 formations of at least 2 formation collection in the REPORT frame.The formation collection quantity of the default support of OLT is 2.ONU should support (at least) 8 formations, and reports the local queue state with the form that each REPORT frame comprises 2 or 2 above formation collection to OLT.Suggestion ONU possesses the ability of supporting 4 formation collection.The formation collection quantity of the default support of ONU is 2.Help the consistency of ONU on the DBA disposal ability like this.But also can be specified to alternate manner, can support at least 4 formation collection such as OLT, ONU should support at least 16 formations, as long as unanimity just can realize intercommunication on regulation.
Be to be understood that, accumulative total (Cumulative) mode that increment (Incremental) mode that the queue length value of the formation #n report that above-mentioned a plurality of formation is concentrated is taked and the queue length value of formation #n report adopt all is optional content, under the condition that satisfies " threshold value of each queue length that optical network unit is concentrated according to formation collection quantity that sets and formation; in the REPORT of Multi-point Control Protocol frame, place the formation collection field and the formation collection quantity of expression queue length ", can make various other designs to the REPORT frame.
(3) optical network unit is reported optical line terminal with the REPORT frame that this has formation collection field and formation collection quantity, and optical line terminal is given the upstream bandwidth mandate that distributes for optical network unit according to upstream queue collection quantity and each queue length.This part proposes in background technology, such algorithm is arranged in the prior art, and the state of the upstream queue that OLT can report up according to ONU is according to algorithm of the prior art, calculate the upstream bandwidth mandate of giving this ONU, with the upstream bandwidth of dynamic control ONU.Therefore, this part is seldom given unnecessary details.
In addition, the invention still further relates to a kind of optical network unit and receive (7), as shown in Figure 7, comprising:
Transmit and accept module (701), be used for transmitting and be received in the setting of the threshold value of each queue length that the formation collection quantity optical network unit supported specific to the Operations, Administration and Maintenance message of the expansion of mechanism and formation concentrate the setting of formation collection quantity and queue length threshold;
To the module (702) that the REPORT frame of the formation collection field of representing queue length has been placed in the optical line terminal transmission, be used for sending the threshold value of each queue length of concentrating according to formation collection quantity that sets and formation and having placed the REPORT frame of the formation collection field of expression queue length to optical line terminal;
Reception is to the module (703) of the mandate of the upstream bandwidth that distributes for optical network unit, is used to receive optical line terminal to the mandate for the upstream bandwidth of optical network unit distribution.
The invention still further relates to a kind of optical line terminal (8), as shown in Figure 8, comprising:
Request and the module (801) of the threshold value of formation collection quantity and each queue length is set is used for asking and be arranged on the threshold value of each queue length that the formation collection quantity supported specific to the Operations, Administration and Maintenance message optical network unit of the expansion of mechanism and formation concentrate;
From the module (802) that the REPORT frame of the formation collection field of representing queue length has been placed in the optical network unit reception, be used for receiving the threshold value of each queue length of concentrating according to formation collection quantity that sets and formation and having placed the REPORT frame of the formation collection field of expression queue length from optical network unit;
To the module (803) that the upstream bandwidth that distributes for optical network unit is authorized, be used for the upstream bandwidth that distributes for optical network unit being authorized according to upstream queue collection quantity and each queue length.
These modules in optical network unit and the optical line terminal all are and the pairing module of method of the present invention, can programme according to the process that embodies in this method by those skilled in the art, programme according to the corresponding function of step in itself and the method in other words and realize, therefore repeat no more.
In a word, the present invention utilizes particular organization expansion (orgnization specific Extension) mechanism of IEEE 802.3ah defined to define the agreement that new OAM Protocol Data Unit carries out DBA ability discovery and parameter configuration, solved since the DBA ability of optical network unit and parameter and OLT do not match cause can't intercommunication problem.In addition, invented redetermination, stipulated the rule of filling in of queue report field that different queue is concentrated the formation collection in the REPORT frame of ONU.Utilize REPORT frame format of the present invention to fill in rule and the DBA parameter management method can be realized the intercommunication of DBA function in the EPON system, applied widely.
Should be appreciated that those skilled in the art can make multiple change and distortion to the present invention in the scope that does not break away from claims.
Claims (9)
1. discovering dynamic band width distributing ability and method for parameter configuration comprise:
In the Operations, Administration and Maintenance message of particular organization expansion, place the formation collection quantity of optical network unit support and the threshold value of each queue length that formation is concentrated, be used between optical line terminal and optical network unit, carrying out the transmission of dynamic band width distributing ability parameter, be provided with;
The threshold value of each formation that optical network unit is concentrated according to the formation collection quantity that sets and formation is placed the formation collection field and the formation collection quantity of expression queue length in the REPORT of Multi-point Control Protocol frame;
Optical network unit is reported optical line terminal with the REPORT frame that this has formation collection field and formation collection quantity, and optical line terminal is the upstream bandwidth mandate that optical network unit distributes according to the length information of upstream queue collection quantity and each formation.
2. according to the process of claim 1 wherein that the Operations, Administration and Maintenance message specific to the expansion of mechanism comprises following four kinds of message: Dynamic Bandwidth Allocation parameter request message; Dynamic Bandwidth Allocation parameter response message, Dynamic Bandwidth Allocation parameter setting request message, Dynamic Bandwidth Allocation parameter are provided with acknowledge message.
3. according to the method for claim 2, the Payload territory of wherein said four kinds of message has mechanism's unique identifier, is used to identify the extended operation sign indicating number of extended operation type, identifies the Dynamic Bandwidth Allocation command code of concrete Dynamic Bandwidth Allocation parameter action type and the unified structure of data/filling field, and data/filling field is used to describe concrete Dynamic Bandwidth Allocation parameter.
4. according to the method for claim 3, the concrete form of wherein said four kinds of message is respectively:
Described Dynamic Bandwidth Allocation parameter request message comprises the extended operation sign indicating number of mechanism's unique identifier, sign extended operation type, Dynamic Bandwidth Allocation sign indicating number, the byte of padding of Dynamic Bandwidth Allocation parameter action type that sign is concrete;
Described Dynamic Bandwidth Allocation parameter response message comprises mechanism's unique identifier, the extended operation sign indicating number of sign extended operation type, be used to identify the Dynamic Bandwidth Allocation command code of concrete Dynamic Bandwidth Allocation parameter action type, be used for describing the formation collection amount field of the REPORT frame formation collection quantity that optical network unit sends, be used for indicating the formation collection field of REPORT frame to comprise the report bitmap field of which formation, be used to indicate each formation of REPORT frame to concentrate the queue thresholds field of the threshold value of individual queue, byte of padding;
Described Dynamic Bandwidth Allocation parameter setting request message comprises mechanism's unique identifier, the extended operation sign indicating number of sign extended operation type, identify the Dynamic Bandwidth Allocation command code of concrete Dynamic Bandwidth Allocation parameter action type, be used for the formation collection amount field that the formation collection quantity of REPORT frame that optical network unit is sent is provided with, be used to be provided with the report bitmap field which formation the REPORT frame comprises, be used for the queue thresholds field of concentrating the threshold value of individual queue to be provided with to each formation of the REPORT frame of optical network unit, byte of padding;
Described Dynamic Bandwidth Allocation parameter is provided with acknowledge message and comprises mechanism's unique identifier, the extended operation sign indicating number of sign extended operation type, identify the Dynamic Bandwidth Allocation command code of concrete Dynamic Bandwidth Allocation parameter action type, the setting of expression Dynamic Bandwidth Allocation parameter whether success the affirmation field is set, be used for confirming the formation collection amount field of the setting of REPORT frame formation collection quantity that optical network unit is sent, be used for confirming the REPORT frame is comprised the report bitmap field of the setting of which formation, be used for confirming queue thresholds field to the setting of the threshold value of each formation collection field individual queue of REPORT frame, byte of padding.
5. as follows according to the process of claim 1 wherein that the threshold value of each formation that optical network unit is concentrated according to the formation collection quantity that sets and formation is placed the process of the formation collection field of representing queue length in the REPORT of Multi-point Control Protocol frame:
In the REPORT frame, place the following content of the formation collection quantity-1 set group: report bitmap, formation #0 report, formation #1 report ... formation #n report ... formation #m reports repetition, n＜m wherein, n and m are natural number, formation #n report expression formation n is engraved in the total length of the complete ethernet frame of this formation under the condition that is lower than the pairing length threshold of this formation and required frame period and forward error correction expense thereof when the REPORT frame produces, last formation collection of this REPORT frame is used to fill in whole length of all formations.
6. according to the method for claim 5, wherein the queue length value of formation #n report adopts bulk billing system.
7. according to the method for claim 5, the queue length value of the formation #n report that wherein a plurality of formations are concentrated is taked incremental mode: for specific formation #n, the queue length value minimum of the formation #n report that first formation in the report frame is concentrated, along with the increase of formation collection sequence number, the queue length value of formation #n report is increasing.
8. optical network unit comprises:
Transmit and be received in the module that the threshold value of each queue length of in the Operations, Administration and Maintenance message of particular organization expansion the formation collection quantity and the formation of optical network unit support being concentrated is provided with;
Send the threshold value of each queue length of concentrating according to formation collection quantity that sets and formation and the module of having placed the REPORT frame of the formation collection field of expression queue length and formation collection quantity to optical line terminal;
Receive optical line terminal to module for the mandate of the upstream bandwidth of optical network unit distribution.
9. optical line terminal comprises:
The module that the threshold value of each queue length of in Operations, Administration and Maintenance (OAM) message of particular organization expansion the formation collection quantity and the formation of optical network unit support being concentrated is asked and is provided with;
Receive the threshold value of each queue length of concentrating according to formation collection quantity that sets and formation and the module of having placed the REPORT frame of the formation collection field of expression queue length and formation collection quantity from optical network unit;
The module according to upstream queue collection quantity and each queue length to authorizing for the upstream bandwidth of optical network unit distribution.
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