CN102740170B - Uplink and downlink transmission method of broadband optical access data - Google Patents
Uplink and downlink transmission method of broadband optical access data Download PDFInfo
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Abstract
The invention relates to an uplink and downlink transmission method of broadband optical access data, belonging to the technical field of data transmission in broadband optical access network. The method provided in the invention aims at compatibly transmitting 10G EPON and XGPON standard information in uplink and downlink directions by an optical distribution network. In downlink transmission process of the optical access data, physical layer structure of XGPON data is modified so that the XGPON data and 10G EPON data can be transmitted in a generally-used time division multiplexing manner. Thus, the 10G EPON data and the XGPON data can be transmitted compatibly in the downlink direction by the optical distribution network, thereby satisfying a demand for high efficient compatibility. In addition, in the uplink direction, an authorization mechanism is utilized to determine the serial number of an optical network unit which transmits uplink data, the data transmitting time of the authorized optical network unit, and length of the transmitted data, thereby being able to guarantee efficiency of data transmitting and data analyzing in the uplink direction.
Description
Technical field
The present invention relates to broadband optical access network data transmission technique field, be specifically related to a kind ofly utilize existing 10G EPON data structure to build XGPON downlink information physical layer encodes and realize the downlink transfer of 10G EPON technology and XGPON data in TDMA mode and utilize the method for uplink of licensing scheme.
Background technology
Access Network occupies to pass consequence in the entire network, PON (Passive OpticalNetwork, passive optical-fiber network) technology with its Large Copacity, high reliability and low cost, become the solution that Access Network that industry generally acknowledges is desirable and long-range.Standardized PON technology has based on ATM (Asynchronous Transfer Mode at present, asynchronous transfer mode) APON (Asynchronous Passive Optical Network, asynchronous passive optical-fiber network), adopt GPON (the Gigabit-Capable PON of Generic Framing Procedure, G bit passive intelligent acess network) and based on EPON (the Ethernet Passive OpticalNetwork of ethernet technology, Ethernet passive optical network), wherein GPON and EPON is current N mainstream technology.
EPON is a kind of intelligent acess network technology, and it adopts point-to-multipoint structure, passive fiber to transmit, on Ethernet, provide multiple business.It has employed PON technology in physical layer, uses Ethernet protocol, utilize the topological structure of PON to achieve the access of Ethernet at link layer.GPON technology adopts PON technology equally in physical layer, adopts Generic Framing Procedure at link layer, and support multi tate grade business, has higher efficiency of transmission and better Qos ensures.IEEE has promulgated 10G EPON standard, and XGPON standard is just formulated by ITU-T.10G EPON and XGPON meets optical access network demand, but because both are by the promotion of various criterionization tissue, can not be compatible in same optical distribution network, respective independent development, complexity, operation maintenance and cost of investment are higher to cause the network operation to be safeguarded.If both be blended in an optical distribution network, will effectively reduce the cost of Large Copacity optical access network, making rational planning for and efficiently managing control of PON technology scale application can be realized simultaneously.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is the compatible transmission how realizing being undertaken by an optical distribution network 10G EPON and XGPON standard information on uplink and downlink direction.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of downlink transmission method of broadband optical access data, comprising the steps:
Step S1: optical line terminal receives 10G EPON data and XGPON data;
Step S2: the physical layer encodes structure according to 10G EPON data carries out physical layer encodes to XGPON data;
Step S3: by the XGPON transfer of data after 10G EPON data and coding to optical network unit;
Step S4: after optical network unit receives data, carries out forward error correction verification to received data;
Step S5: the data verified by forward error correction are judged as 10G EPON data, the data do not verified by forward error correction are judged as XGPON data.
Specifically comprise the steps: in described step S2
Step S201: XGPON data are divided into groups in units of 64 bit lengths;
Step S202: often organizing the synchronous head adding 2 bits in 64 bit length data, forms the block data structure often organizing 66 bit length data;
Step S203: using block data structure described in 31 groups as minimum data unit, with minimum data unit composition XGPON data described in several at the subframe structure of physical layer.
Described step S203: in the synchronous head in described 31 groups of block data structures, for 27 synchronous heads that block data structure described in first 27 groups comprises successively, the synchronous head of the block data structure of odd number order is wherein set as 01, and the synchronous head of the block data structure of even number order is wherein set as 10; Then the synchronous head in block data structure described in latter 4 groups is set as 00,11,00 and 11 successively.
Described step S4 specifically comprises the steps:
Step S401: obtain synchronously by the synchronous head searching for received data;
Step S402: the data burst that to obtain with 31 group of 66 bit length data be minimum data unit, and forward error correction verification is carried out to the 31 group of 66 bit length data comprised in described data burst.
In described step S3, optical line terminal adopts time-multiplexed mode to transfer data to optical network unit.
In addition, the present invention also provides a kind of ascending transmission method of broadband optical access data, comprises the steps:
Step T1: optical line terminal sends data transmission grant information to optical network unit;
Step T2:10G EPON data light network element sends 10G EPON data to optical line terminal according to the data transmission grant information received;
XGPON data light network element sends XGPON data to optical line terminal according to the data transmission grant information received;
Step T3: optical line terminal judges received decoding data according to the standard of transmitted data transmission grant information, distinguishes 10G EPON data and XGPON data.
The moment that described data transmission grant information comprises authorized optical network unit numbering, authorized optical network unit sends data and send the length of data.
Described step T2 specifically comprises:
According to the optical network unit numbering in the data transmission grant information received, each 10G EPON data light network element judges whether oneself is authorized optical network unit, if so, then according to moment of the transmission data in data transmission grant information and send data length send 10G EPON data to optical line terminal;
According to the optical network unit numbering in the data transmission grant information received, each XGEPON data light network element judges whether oneself is authorized optical network unit, if so, then according to moment of the transmission data in data transmission grant information and send data length send XGEPON data to optical line terminal.
Described step T3 specifically comprises:
Optical line terminal intercepts the data of corresponding length in corresponding moment according to transmitted data transmission grant information, and to carry out according to described optical network unit numbering the data that district office receives be 10G EPON data or XGPON data.
In described step T2, optical network unit adopts time-multiplexed mode to transfer data to optical line terminal.
(3) technique effect
Technical scheme involved in the present invention, in soft exchange data downstream transmitting procedure, by carrying out physical layer architecture amendment to XGPON data, thus make it can be transmitted by the time division multiplexing mode generally adopted together with 10G EPON data, thus achieve 10GEPON data and XGPON data carry out the transmission of Campatible at down direction by an optical distribution network, compatible high efficiency demand can be met.
In addition, at up direction, owing to utilizing licensing scheme to determine the optical network unit numbering of transmit ascending data, moment that authorized optical network unit sends data and the length of transmission data, thus the transfer of data of up direction and the efficiency of parsing can be ensured.
Accompanying drawing explanation
Fig. 1 is the flow chart of down direction transfer of data embodiment of the present invention;
Fig. 2 is the flow chart of up direction transfer of data embodiment of the present invention;
Fig. 3 is the schematic diagram of CPON coded system in down direction data transmission procedure of the present invention;
Fig. 4 is the rule that in down direction data transmission procedure of the present invention, OLT sends downlink data;
Fig. 5 is the OLT functional block diagram in embodiments of the invention;
Fig. 6 is the ONU functional block diagram in embodiments of the invention;
Fig. 7 is the schematic diagram of PON topological structure of the present invention and classic applications scene.
Embodiment
For making object of the present invention, content and advantage clearly, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
A kind of 10G EPON provided by the present invention and XGPON network integration scheme adopt time division multiplexing mode to transmit two kinds of information in physical layer, ensure the complete compatibility to 10G EPON standard, only add physical layer encodes to XGPON.
Wherein, the downlink transmission method of broadband optical access data provided by the present invention, be applied particularly in PON access net system, this PON access net system comprises optical line terminal (OpticalLine Terminal, and optical network unit (Optical Net Unit OLT), ONU), wherein, local side downlink information obtains and stores processor, local side send mandate, local side downlink information sends, local side uplink information is received in optical line terminal and realizes, and far-end downlink information receives, far-end uplink information sends and then realizes in optical network unit.
(1) down direction
As shown in Figure 1, the downlink transmission method of described broadband optical access data comprises the steps:
Step 100: first optical line terminal OLT obtains 10G EPON data and XGPON data from data link layer;
Step 101: after receiving information, optical line terminal OLT judges whether it is 10G EPON data;
Step 102: if, then by it its directly stored in buffer memory A;
Step 103: if not 10G EPON data, then show that it is XGPON data, and the physical layer encodes structure according to 10G EPON data carries out physical layer encodes to these XGPON data;
Step 104: by the XGPON data after coding stored in buffer memory B;
Step 105: optical line terminal OLT, according to the memory state of buffer memory, is chosen the XGPON data after 10G EPON data and coding with certain rule, adopted time-multiplexed mode to carry out being sent to optical network unit ONU from buffer memory;
Step 106: after optical network unit ONU receives the data that optical line terminal OLT sends, the synchronous head first searching for received data obtains synchronously, the data burst that to obtain with 31 64bit data block data be minimum data unit;
Step 107: forward error correction FEC verification is carried out to the 31 group of 66 bit length data comprised in described data burst;
Step 108: judge whether data are verified by forward error correction;
Step 109: the data verified by forward error correction are judged as 10G EPON data;
Step 110: the data do not verified by forward error correction are judged as XGPON data.
Wherein, as shown in Figure 3, according to the physical layer encodes structure of 10G EPON data, XGPON data are carried out to the process of physical layer encodes in described step S103, specifically comprise the steps:
Step S103A: XGPON data are grouped into independent data block 300 in units of 64 bit lengths;
Step S103B: often organizing the synchronous head adding 2 bits in 64 bit length data, forms the block data structure often organizing 66 bit length data;
Step S103C: using block data structure described in 31 groups as minimum data unit, with minimum data unit composition XGPON data described in several at the subframe structure of physical layer.
Wherein, in described step S103C, in synchronous head in described 31 groups of block data structures, for 27 synchronous heads 301 that block data structure described in first 27 groups comprises successively, the synchronous head of the block data structure of odd number order is wherein set as 01, and the synchronous head of the block data structure of even number order is wherein set as 10; Then the synchronous head 302 in block data structure described in latter 4 groups is set as 00,11,00 and 11 successively.
Constitute the structure in units of 31 66 bit data block.The XGPON data structure of N number of 31*66bit length is in physical layer composition XGPON subframe 303.For 10GEPON information, by 64/66B coding and the scrambler FEC forward error correction verification 304 of 10G EPON standard criterion, form the data structure 305 that the length be made up of 27 66bit data blocks and 4 66bit controll block is 31 66bit, wherein the synchronous head of front 27 data blocks is in turn for being 01 and 10, rear 4 controll block synchronous heads successively 00,11,00,11.The 10G EPON data structure of M 31*66bit length is in physical layer composition 10G EPON subframe 306.XGPON subframe 303 and 10G EPON subframe 306 be composition CPON frame 307 jointly.Described search synchronous head obtains synchronous, is the data block of searching for this structure, and continuous acquisition is not less than K 31*66bit length data structure 301 or 305 and is indicated as synchronously, and M, N, K are system configuration.
As shown in Figure 4, in described step 105, optical line terminal OLT reads data according to necessarily rule transmission is as follows from buffer memory.OLT initial condition is the EPON data 400 that state 1, OLT sends N*31*66bit.Then jump to the XGPON data 401 that state 2, OLT sends M*31*66bit, after being sent, unconditional jump is to state 1.M and N value is by system configuration.
(2) up direction
As shown in Figure 2, the ascending transmission method of broadband optical access data provided by the present invention, comprises the steps:
Step 200: optical line terminal OLT powers on and first carries out initialization, generates polling request and is sent to optical network unit ONU downwards;
The optical network unit ONU of step 201:10G EPON receives polling request;
The optical network unit ONU of step 202:10G EPON generates according to own cache situation and sends request, and sends request and only includes transmit queue length;
The optical network unit ONU of step 203:XGPON receives polling request equally;
The optical network unit ONU of step 204:XGPON generates according to own cache situation and sends request;
Step 205: optical line terminal OLT receives sending request of two kinds of optical network unit ONU transmissions;
Step 206: optical line terminal OLT generates data transmission grant information, and send data transmission grant information to described two kinds of optical network unit ONU, the moment that data transmission grant information comprises authorized optical network unit numbering, authorized optical network unit sends data and send the length of data;
The optical network unit ONU of step 207:10G EPON receives data transmission grant information;
The optical network unit ONU of step 208:10G EPON adopts time-multiplexed mode to send the data of corresponding length to optical line terminal OLT according to the data transmission grant information received in the corresponding time;
The optical network unit ONU of step 209:XGPON receives data transmission grant information;
The optical network unit ONU of step 210:XGPON adopts time-multiplexed mode to send the data of corresponding length to optical line terminal OLT according to the data transmission grant information received in the corresponding time;
Step 211: the known optical network unit ONU of optical line terminal OLT sends the due in of data, length and data type, can judge received decoding data according to the standard of transmitted data transmission grant information, distinguish 10G EPON data and XGPON data.
Wherein, described step 208 specifically comprises: according to the optical network unit numbering in the data transmission grant information received, each 10G EPON data optical network unit ONU judges whether oneself is authorized optical network unit, if so, then according to moment of the transmission data in data transmission grant information and send data length send 10G EPON data to optical line terminal OLT.
Wherein, described step 210 specifically comprises: according to the optical network unit numbering in the data transmission grant information received, each XGEPON data optical network unit ONU judges whether oneself is authorized optical network unit, if so, then according to moment of the transmission data in data transmission grant information and send data length send XGEPON data to optical line terminal OLT.
Described step 211 specifically comprises: optical line terminal OLT intercepts the data of corresponding length in corresponding moment according to transmitted data transmission grant information, and to carry out according to described optical network unit numbering the data that district office receives be 10G EPON data or XGPON data.
The functional block diagram of OLT involved in the present embodiment see Fig. 5, ONU functional block diagram see Fig. 6.Fig. 7 is PON topological structure of the present invention and classic applications scene.
Fig. 5 is the functional block diagram of embodiment optical line terminal OLT of the present invention.Optical line terminal utilizes " Ethernet switching chip ", and upper layer network exchange data, data type is 10GEPON data and XGPON data, and namely abovementioned steps 100 completes in this module.The data that " local side downlink information obtains and stores processor module " sends over from Ethernet switching chip acquisition network layer, these information carried out storing and processing accordingly, namely step 101 and 103 completes in this module." OLT PON functional module " completes the standard feature of OLT, has FEC, the rate transition of data, data conversion of going here and there, and namely step 102 and 104 completes in this module.The authorized application that " local side transmission authorization module " sends according to ONU generates corresponding authorization message, and namely step 200,206 completes in this module." local side downlink information sending module " is responsible for sending data to ONU, and namely step 105 completes in this module." local side uplink information receiver module " receives the data that ONU sends, these data are carried out divide into 10G EPON data or XGPON data, and process of decoding accordingly, the data after process be sent to " Ethernet switching chip ", namely step 205,211 completes in this module.
Fig. 6 is embodiment ONU functional block diagram of the present invention." far-end downlink information receiver module " receives the data that OLT sends, and carry out differentiation to data and differentiate and be sent to next module, namely step 201,203,207,209 completes in this module." far-end uplink information sending module " sends request according to transmission, and authorizes transmission data according to transmission, and namely step 202,204,208,210 completes in this module.The basic PON functional module of ONU is the module of standard ONU definition, completes physical layer encoding and decoding, carries out data exchanging function with user.
Fig. 7 is PON topological structure of the present invention and classic applications scene.Show PON to be made up of OLT and ONU, be between core net and user in a network.The present invention's innovation is that the ONU of ONU and the XGPON type of 10G EPON type can receive on same OLT, no longer needs the OLT of difference in functionality to go to access different ONU respectively.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (4)
1. a uplink and downlink transmission method for broadband optical access data, is characterized in that, described uplink and downlink transmission method comprises the step of downlink transmission data and the step of uplink transmission data:
The step of downlink transmission data specifically comprises:
Step S1: optical line terminal receives 10G EPON data and XGPON data;
Step S2: the physical layer encodes structure according to 10G EPON data carries out physical layer encodes to XGPON data; Specifically comprise the steps:
Step S201: XGPON data are divided into groups in units of 64 bit lengths;
Step S202: often organizing the synchronous head adding 2 bits in 64 bit length data, forms the block data structure often organizing 66 bit length data;
Step S203: using block data structure described in 31 groups as minimum data unit, with minimum data unit composition XGPON data described in several at the subframe structure of physical layer; Specifically comprise the steps:
In synchronous head in described 31 groups of block data structures, for 27 synchronous heads 301 that block data structure described in first 27 groups comprises successively, the synchronous head of the block data structure of odd number order is wherein set as 01, and the synchronous head of the block data structure of even number order is wherein set as 10; Then the synchronous head 302 in block data structure described in latter 4 groups is set as 00,11,00 and 11 successively;
Step S3: by the XGPON transfer of data after 10G EPON data and coding to optical network unit;
Step S4: after optical network unit receives data, carries out forward error correction verification to received data; Specifically comprise the steps:
Step S401: obtain synchronously by the synchronous head searching for received data;
Step S402: the data burst that to obtain with 31 group of 66 bit length data be minimum data unit, and forward error correction verification is carried out to the 31 group of 66 bit length data comprised in described data burst;
Step S5: the data verified by forward error correction are judged as 10G EPON data, the data do not verified by forward error correction are judged as XGPON data;
The step of uplink transmission data specifically comprises:
Step T1: optical line terminal sends data transmission grant information to optical network unit;
Step T2:10G EPON data light network element sends 10G EPON data to optical line terminal according to the data transmission grant information received;
XGPON data light network element sends XGPON data to optical line terminal according to the data transmission grant information received;
Specifically comprise:
According to the optical network unit numbering in the data transmission grant information received, each 10G EPON data light network element judges whether oneself is authorized optical network unit, if so, then according to moment of the transmission data in data transmission grant information and send data length send 10G EPON data to optical line terminal;
According to the optical network unit numbering in the data transmission grant information received, each XGEPON data light network element judges whether oneself is authorized optical network unit, if so, then according to moment of the transmission data in data transmission grant information and send data length send XGEPON data to optical line terminal;
Step T3: optical line terminal judges received decoding data according to the standard of transmitted data transmission grant information, distinguishes 10G EPON data and XGPON data; Specifically comprise:
Optical line terminal intercepts the data of corresponding length in corresponding moment according to transmitted data transmission grant information, and to carry out according to described optical network unit numbering the data that district office receives be 10G EPON data or XGPON data.
2. the uplink and downlink transmission method of broadband optical access data as claimed in claim 1, it is characterized in that, in described step S3, optical line terminal adopts time-multiplexed mode to transfer data to optical network unit.
3. the uplink and downlink transmission method of broadband optical access data as claimed in claim 1, it is characterized in that, the moment that described data transmission grant information comprises authorized optical network unit numbering, authorized optical network unit sends data and send the length of data.
4. the uplink and downlink transmission method of the broadband optical access data as described in any one of claims 1 or 3, is characterized in that, in described step T2, optical network unit adopts time-multiplexed mode to transfer data to optical line terminal.
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| CN103124382B (en) * | 2013-02-01 | 2016-08-03 | 北京邮电大学 | Differentiation network coding method, device and the system transmitted towards asymmetric data |
| CN103138833B (en) * | 2013-02-01 | 2015-09-02 | 北京邮电大学 | Based on network code pair relationhip management method in the PON of flow monitoring |
| CN110380957B (en) | 2015-03-30 | 2022-05-24 | 华为技术有限公司 | Data processing method and device |
| CN117425101B (en) * | 2023-12-18 | 2024-03-22 | 厦门鹏芯半导体有限公司 | Frame decoding method and device of GPON resource checker |
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