CN102740170A - 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 light Access Network technical field of data transmission, be specifically related to a kind ofly utilize existing 10G EPON data structure to make up XGPON downlink information physical layer encodes and realize the downlink transfer of 10G EPON technology and XGPON data and utilize the method for the uplink of licensing scheme with the TDMA mode.
Background technology
Access Network occupies to the pass consequence in whole network, PON (Passive OpticalNetwork, passive optical-fiber network) technology becomes the desirable and long-range solution of Access Network that industry is generally acknowledged with its big capacity, high reliability and low cost.Standardized at present PON technology has (the Asynchronous Transfer Mode based on ATM; 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 Optical Access Network network) with based on the EPON (Ethernet Passive OpticalNetwork, Ethernet passive optical network) of ethernet technology, wherein GPON and EPON are present N mainstream technologys.
EPON is a kind of Optical Access Network technology, and it adopts point to multipoint configuration, passive fiber transmission, and multiple business is provided on Ethernet.It has adopted PON technology in physical layer, uses Ethernet protocol at link layer, utilizes the topological structure of PON to realize the access of Ethernet.The GPON technology adopts the PON technology equally in physical layer, adopts Generic Framing Procedure at link layer, supports many speed grade professional, has higher efficiency of transmission and guarantees with better Qos.IEEE has issued 10G EPON standard, and the XGPON standard is just formulated by ITU-T.10G EPON and XGPON meet the optical access network demand, but owing to both are promoted by the various criterion tissue, can not be compatible in same optical distribution network, independent development causes the network operation to safeguard that complicacy, operation maintenance and cost of investment are higher separately.If both are blended in the optical distribution network, with the cost that effectively reduces big Capacity Optical Access Network, the while can realize making rational planning for of PON technology scale application and high-efficiency management is controlled.
Summary of the invention
The technical problem that (one) will solve
The technical problem that the present invention will solve is how on the uplink and downlink direction, to realize carrying out through an optical distribution network compatibility transmission of 10G EPON and XGPON standard information.
(2) technical scheme
For solving the problems of the technologies described above, the present invention provides a kind of broadband light to insert the downlink transmission method of data, comprises 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 is carried out physical layer encodes to the XGPON data;
Step S3: with 10G EPON data and the coding after the XGPON transfer of data to optical network unit;
Step S4: optical network unit receives after the data, and received data are carried out the forward error correction verification;
Step S5: will be judged as 10G EPON data through the data of forward error correction verification, data through the forward error correction verification not are judged as the XGPON data.
Specifically comprise the steps: among the said step S2
Step S201: is that unit divides into groups with the XGPON data with 64 bit lengths;
Step S202: in every group 64 bit length data, add the synchronous head of 2 bits, constitute the block data structure of every group 66 bit length data;
Step S203: 31 groups of said block data structures as the minimum data unit, are formed the subframe structure of XGPON data in physical layer with several said minimum data unit.
Said step S203: in the synchronous head in said 31 groups of block data structures; For preceding 27 groups 27 synchronous heads that said block data structure comprised successively; The synchronous head of the block data structure of wherein odd number order is set at 01, and the synchronous head of the block data structure of even number order that will be wherein is set at 10; Then the synchronous head in the 4 groups of said block data structures in back is set at 00,11,00 and 11 successively.
Said step S4 specifically comprises the steps:
Step S401: obtain synchronously through searching for received synchronization of data head;
Step S402: the data burst that to obtain with 31 group of 66 bit length data be the minimum data unit, and the 31 group of 66 bit length data that is comprised in the said data burst are carried out the forward error correction verification.
Among the said 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 broadband light to insert the ascending transmission method of data, comprises the steps:
Step T1: optical line terminal sends the transfer of data authorization message to optical network unit;
Step T2:10G EPON data light NE sends 10G EPON data to optical line terminal according to the transfer of data authorization message that receives;
XGPON data light NE sends the XGPON data to optical line terminal according to the transfer of data authorization message that receives;
Step T3: optical line terminal to the judgement of decoding of received data, is distinguished 10G EPON data and XGPON data according to the standard of the transfer of data authorization message of being transmitted.
Said transfer of data authorization message comprises that the optical network unit numbering that obtains authorizing, the optical network unit that is authorized to send the moment of data and the length of the data of sending.
Said step T2 specifically comprises:
Each 10G EPON data light NE judges according to the numbering of the optical network unit in the transfer of data authorization message that receives whether oneself is the optical network unit that is authorized to; If then send 10G EPON data to optical line terminal according to the length of the moment of the transmission data in the transfer of data authorization message and the data of sending;
Each XGEPON data light NE judges according to the numbering of the optical network unit in the transfer of data authorization message that receives whether oneself is the optical network unit that is authorized to; If then send the XGEPON data to optical line terminal according to the moment of the transmission data in the transfer of data authorization message and the length of the data of sending.
Said step T3 specifically comprises:
Optical line terminal is according to the data of the transfer of data authorization message of being transmitted in the corresponding respective length of intercepting constantly, and is 10G EPON data or XGPON data according to the data that said optical network unit numbers the district office to receive.
Among the said 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; Insert in the data downstream transmission course at light; Revise through the XGPON data being carried out physical layer architecture; Thereby it can be transmitted through the time division multiplexing mode that generally adopts with 10G EPON data, thereby realized that 10GEPON data and XGPON data carry out the transmission of Campatible at down direction through an optical distribution network, can satisfy compatible high efficiency demand.
In addition; At up direction; Confirm that the optical network unit numbering of transmit ascending data, the optical network unit that is authorized to send the moment of data and the length of the data of sending, thereby can guarantee the transfer of data and the analytic efficiency of up direction owing to utilize licensing scheme.
Description of drawings
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 sketch map of CPON coded system in the down direction data transmission procedure of the present invention;
Fig. 4 is the rule that OLT sends downlink data in the down direction data transmission procedure of the present invention;
Fig. 5 is the OLT functional block diagram in the embodiments of the invention;
Fig. 6 is the ONU functional block diagram in the embodiments of the invention;
Fig. 7 is the sketch map of PON network topology structure of the present invention and classic applications scene.
Embodiment
For making the object of the invention, content and advantage clearer, below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.
A kind of 10G EPON provided by the present invention and XGPON network integration scheme adopt two kinds of information of time division multiplexing mode transmission in physical layer, guarantee the complete compatibility to 10G EPON standard, only XGPON are added physical layer encodes.
Wherein, Broadband light provided by the present invention inserts the downlink transmission method of data; Specifically be applied in the PON access net system, this PON access net system comprise optical line terminal (OpticalLine Terminal, OLT) and optical network unit (Optical Net Unit; ONU); Wherein, the local side downlink information obtains with stores processor, local side transmission and authorizes, the local side downlink information sends, the local side uplink information is received in the optical line terminal and realizes, the far-end downlink information receives, the far-end uplink information sends and then in optical network unit, realizes.
(1) down direction
As shown in Figure 1, the downlink transmission method that said broadband light inserts data comprises the steps:
Step 100: optical line terminal OLT is at first obtained 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 it directly deposits among the buffer memory A with it;
Step 103: if not 10G EPON data, show that then it is the XGPON data, these XGPON data are carried out physical layer encodes according to the physical layer encodes structure of 10G EPON data;
Step 104: the XGPON data after will encoding deposit among the buffer memory B;
Step 105: optical line terminal OLT is according to the memory state of buffer memory, from buffer memory, chooses XGPON data behind 10G EPON data and the coding with certain rule, adopts time-multiplexed mode to be sent to optical network unit ONU;
Step 106: optical network unit ONU is at first searched for received synchronization of data head and is obtained synchronously after receiving the data of optical line terminal OLT transmission, and obtaining with 31 64bit data block data is the data burst of minimum data unit;
Step 107: 31 group of 66 bit length data to being comprised in the said data burst are carried out forward error correction FEC verification;
Step 108: whether judgment data is through the forward error correction verification;
Step 109: will be judged as 10G EPON data through the data of forward error correction verification;
Step 110: will be not data through the forward error correction verification be judged as the XGPON data.
Wherein, as shown in Figure 3, according to the physical layer encodes structure of 10G EPON data the XGPON data are carried out the process of physical layer encodes among the said step S103, specifically comprise the steps:
Step S103A: is that unit is grouped into independent data block 300 with the XGPON data with 64 bit lengths;
Step S103B: in every group 64 bit length data, add the synchronous head of 2 bits, constitute the block data structure of every group 66 bit length data;
Step S103C: 31 groups of said block data structures as the minimum data unit, are formed the subframe structure of XGPON data in physical layer with several said minimum data unit.
Wherein, Among the said step S103C; In the synchronous head in said 31 groups of block data structures; For preceding 27 groups 27 synchronous heads 301 that said block data structure comprised successively, the synchronous head of the block data structure of wherein odd number order is set at 01, and the synchronous head of the block data structure of even number order that will be wherein is set at 10; Then the synchronous head 302 in the 4 groups of said block data structures in back is set at 00,11,00 and 11 successively.
The structure that so just to have constituted with 31 66 bit data block be unit.The XGPON data structure of N 31*66bit length is formed XGPON subframe 303 in physical layer.For 10GEPON information; 64/66B coding and scrambler FEC forward error correction verification 304 through 10G EPON standard criterion; Formation is the data structure 305 of 31 66bit by the length that 27 66bit data blocks and 4 66bit controll block constitute; The synchronous head of wherein preceding 27 data blocks is in turn for being 01 and 10, back 4 controll block synchronous heads successively 00,11,00,11.The 10G EPON data structure of M 31*66bit length is formed 10G EPON subframe 306 in physical layer.XGPON subframe 303 and the 10G EPON subframe 306 common CPON frames 307 of forming.Said search synchronous head obtains synchronously, is the data block of this structure of search, obtains to be not less than K 31*66bit length data structure 301 or 305 continuously and is indicated as synchronously, and M, N, K are system configuration.
As shown in Figure 4, optical line terminal OLT reading of data from buffer memory is sent as follows according to certain rule in the said step 105.The OLT initial condition is a state 1, and OLT sends the EPON data 400 of N*31*66bit.Jump to state 2 then, OLT sends the XGPON data 401 of M*31*66bit, sends unconditional jump to the state 1 afterwards that finishes.M and N value can be passed through system configuration.
(2) up direction
As shown in Figure 2, broadband light provided by the present invention inserts the ascending transmission method of data, comprises the steps:
Step 200: optical line terminal OLT powers on and at 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 is according to self caching situation generation transmission request, and the request of transmission includes only 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 is according to self caching situation generation transmission request;
Step 205: optical line terminal OLT receives the transmission request that two kinds of optical network unit ONU are sent;
Step 206: optical line terminal OLT generates the transfer of data authorization message; And send transfer of data authorization message to said two kinds of optical network unit ONU, the transfer of data authorization message comprises that the optical network unit numbering that obtains authorizing, the optical network unit that is authorized to send the moment of data and the length of the data of sending;
The optical network unit ONU of step 207:10G EPON receives the transfer of data authorization message;
The optical network unit ONU of step 208:10G EPON adopts data that time-multiplexed mode sends respective length to optical line terminal OLT according to the transfer of data authorization message that receives in the corresponding time;
The optical network unit ONU of step 209:XGPON receives the transfer of data authorization message;
The optical network unit ONU of step 210:XGPON adopts data that time-multiplexed mode sends respective length to optical line terminal OLT according to the transfer of data authorization message that receives in the corresponding time;
Step 211: the known optical network unit ONU of optical line terminal OLT is sent due in, length and the data type of data; Can distinguish 10G EPON data and XGPON data according to the standard of the transfer of data authorization message of being transmitted to the judgement of decoding of received data.
Wherein, Said step 208 specifically comprises: each 10G EPON data optical network unit ONU judges according to the numbering of the optical network unit in the transfer of data authorization message that receives whether oneself is the optical network unit that is authorized to; If then send 10G EPON data to optical line terminal OLT according to the length of the moment of the transmission data in the transfer of data authorization message and the data of sending.
Wherein, Said step 210 specifically comprises: each XGEPON data optical network unit ONU judges according to the numbering of the optical network unit in the transfer of data authorization message that receives whether oneself is the optical network unit that is authorized to; If then send the XGEPON data to optical line terminal OLT according to the moment of the transmission data in the transfer of data authorization message and the length of the data of sending.
Said step 211 specifically comprises: optical line terminal OLT is according to the data of the transfer of data authorization message of being transmitted in the corresponding respective length of intercepting constantly, and is 10G EPON data or XGPON data according to the data that said optical network unit numbers the district office to receive.
The functional block diagram of related OLT is referring to Fig. 5 in the present embodiment, and the ONU functional block diagram is referring to Fig. 6.Fig. 7 is PON network topology structure according to the invention and classic applications scene.
Fig. 5 is the functional block diagram of embodiment optical line terminal OLT according to the invention.Optical line terminal utilizes " Ethernet switching chip ", and upper layer network exchange data, data type are 10GEPON data and XGPON data, and promptly abovementioned steps 100 is accomplished in this module." the local side downlink information obtains and the stores processor module " obtained the data that network layer sends over from Ethernet switching chip, and these information are stored and handled accordingly, and promptly step 101 and 103 is accomplished in this module." OLT PON functional module " accomplished the standard feature of OLT, and FEC is arranged, the rate transition of data, and data and string transform, and promptly step 102 and 104 is accomplished in this module." local side transmission authorization module " generates corresponding authorization message according to the authorized application that ONU sends, and promptly step 200,206 is accomplished in this module." local side downlink information sending module " is responsible for sending data to ONU, and promptly step 105 is accomplished in this module." local side uplink information receiver module " receives the data that ONU sends; These data are divided into 10G EPON data or XGPON data; And carry out corresponding decoding processing, and the data after handling are sent to " Ethernet switching chip ", promptly step 205,211 is accomplished in this module.
Fig. 6 is an embodiment ONU functional block diagram according to the invention." far-end downlink information receiver module " receives the data that OLT sends, and data are distinguished differentiation and are sent to next module, and promptly step 201,203,207,209 is accomplished in this module." far-end uplink information sending module " asks according to sending, and sends data according to sending to authorize, and promptly step 202,204,208,210 is accomplished in this module.The basic PON functional module of ONU is the module of standard ONU definition, accomplishes the physical layer encoding and decoding, carries out data exchanging function with the user.
Fig. 7 is PON network topology structure according to the invention and classic applications scene.Showed the PON network and constituted, in network, be between core net and the user by OLT and ONU.The present invention's innovation is that the ONU of 10G EPON type and the ONU of XGPON type can receive on the same OLT, no longer need the OLT of difference in functionality to remove to insert respectively different ONU.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from know-why of the present invention; Can also make some improvement and distortion, these improvement and distortion also should be regarded as protection scope of the present invention.
Claims (10)
1. the downlink transmission method of broadband light access data is characterized in that said downlink transmission method comprises 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 is carried out physical layer encodes to the XGPON data;
Step S3: with 10G EPON data and the coding after the XGPON transfer of data to optical network unit;
Step S4: optical network unit receives after the data, and received data are carried out the forward error correction verification;
Step S5: will be judged as 10G EPON data through the data of forward error correction verification, data through the forward error correction verification not are judged as the XGPON data.
2. insert the downlink transmission method of data like claims 1 described broadband light, it is characterized in that, specifically comprise the steps: among the said step S2
Step S201: is that unit divides into groups with the XGPON data with 64 bit lengths;
Step S202: in every group 64 bit length data, add the synchronous head of 2 bits, constitute the block data structure of every group 66 bit length data;
Step S203: 31 groups of said block data structures as the minimum data unit, are formed the subframe structure of XGPON data in physical layer with several said minimum data unit.
3. insert the downlink transmission method of data like claims 2 described broadband light; It is characterized in that; Said step S203: in the synchronous head in said 31 groups of block data structures; For preceding 27 groups 27 synchronous heads that said block data structure comprised successively, the synchronous head of the block data structure of wherein odd number order is set at 01, and the synchronous head of the block data structure of even number order that will be wherein is set at 10; Then the synchronous head in the 4 groups of said block data structures in back is set at 00,11,00 and 11 successively.
4. insert the downlink transmission method of data like claims 3 described broadband light, it is characterized in that said step S4 specifically comprises the steps:
Step S401: obtain synchronously through searching for received synchronization of data head;
Step S402: the data burst that to obtain with 31 group of 66 bit length data be the minimum data unit, and the 31 group of 66 bit length data that is comprised in the said data burst are carried out the forward error correction verification.
5. insert the downlink transmission method of data like each described broadband light of claims 1-4, it is characterized in that among the said step S3, optical line terminal adopts time-multiplexed mode to transfer data to optical network unit.
6. the ascending transmission method of broadband light access data is characterized in that said method comprises the steps:
Step T1: optical line terminal sends the transfer of data authorization message to optical network unit;
Step T2:10G EPON data light NE sends 10G EPON data to optical line terminal according to the transfer of data authorization message that receives;
XGPON data light NE sends the XGPON data to optical line terminal according to the transfer of data authorization message that receives;
Step T3: optical line terminal to the judgement of decoding of received data, is distinguished 10G EPON data and XGPON data according to the standard of the transfer of data authorization message of being transmitted.
7. insert the ascending transmission method of data like claims 6 described broadband light; It is characterized in that said transfer of data authorization message comprises that the optical network unit numbering that obtains authorizing, the optical network unit that is authorized to send the moment of data and the length of the data of sending.
8. insert the ascending transmission method of data like claims 7 described broadband light, it is characterized in that said step T2 specifically comprises:
Each 10G EPON data light NE judges according to the numbering of the optical network unit in the transfer of data authorization message that receives whether oneself is the optical network unit that is authorized to; If then send 10G EPON data to optical line terminal according to the length of the moment of the transmission data in the transfer of data authorization message and the data of sending;
Each XGEPON data light NE judges according to the numbering of the optical network unit in the transfer of data authorization message that receives whether oneself is the optical network unit that is authorized to; If then send the XGEPON data to optical line terminal according to the moment of the transmission data in the transfer of data authorization message and the length of the data of sending.
9. insert the ascending transmission method of data like claims 7 described broadband light, it is characterized in that said step T3 specifically comprises:
Optical line terminal is according to the data of the transfer of data authorization message of being transmitted in the corresponding respective length of intercepting constantly, and is 10G EPON data or XGPON data according to the data that said optical network unit numbers the district office to receive.
10. insert the ascending transmission method of data like each described broadband light of claims 6-9, it is characterized in that among the said step T2, optical network unit adopts time-multiplexed mode to transfer data to optical line terminal.
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| CN103124382A (en) * | 2013-02-01 | 2013-05-29 | 北京邮电大学 | Differentiation network coding method, device and system for asymmetrical data transfer |
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| CN117425101A (en) * | 2023-12-18 | 2024-01-19 | 厦门鹏芯半导体有限公司 | Frame decoding method and device of GPON resource checker |
| 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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