CN102055727B - Data encapsulation method, encapsulation equipment and branch unit in multi-service transport network - Google Patents
Data encapsulation method, encapsulation equipment and branch unit in multi-service transport network Download PDFInfo
- Publication number
- CN102055727B CN102055727B CN 200910207790 CN200910207790A CN102055727B CN 102055727 B CN102055727 B CN 102055727B CN 200910207790 CN200910207790 CN 200910207790 CN 200910207790 A CN200910207790 A CN 200910207790A CN 102055727 B CN102055727 B CN 102055727B
- Authority
- CN
- China
- Prior art keywords
- frame head
- layer frame
- channel layer
- adaptation layer
- bit pattern
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Time-Division Multiplex Systems (AREA)
Abstract
The embodiment of the invention provides a data encapsulation method, encapsulation equipment and a branch unit in a multi-service transport network. The data encapsulation method in the multi-service transport network comprises the following steps of: generating frame header check bytes of an adaptation layer frame header according to a first frame header check algorithm, and inserting the frame header check bytes into a frame header check field of the adaptation layer frame header; performing XOR operation on the adaptation layer frame header and a first bit pattern, and encapsulating payloads of the adaptation layer frame header and an adaptation layer frame acquired after the XOR operation into the payload of a channel layer frame, wherein the payload of the adaptation layer frame bears service data in the multi-service transport network; generating frame header check bytes of a channel layer frame header according to a second frame header check algorithm, and inserting the frame header check bytes into a frame header check field of the channel layer frame header; and performing XOR operation on the channel layer frame header and a second bit pattern, and encapsulating payloads of the channel layer frame header and the channel layer frame acquired after the XOR operation into the channel layer frame. According to the embodiment of the invention, accurate positioning of the channel layer frame and the adaptation layer frame is realized.
Description
Technical field
The embodiment of the present invention relates to communication technical field, relates in particular to data encapsulation method, sealed in unit and tributary unit in a kind of multi-service transmitting network.
Background technology
The present network carrying multiple business, and as voice, video, online game and network browsing etc., communication network is increasingly sophisticated, and capacity is also increasing.In this case, how to realize time division multiplexing (Time Division Multiplexing; Hereinafter to be referred as: TDM) the unified carrying of business and several data business, and (the Quality of Service that guarantees service quality; Hereinafter to be referred as: QoS), become a urgent problem.
In recent years, very great telecommunications operation commercial city has been selected with gigabit passive optical network (GigabitPassive Optical Network; Hereinafter to be referred as: GPON) as the solution of multiple service supporting.The payload section of GPON frame structure is except bearing asynchronous transmission mode (Asynchronous TransferMode; Hereinafter to be referred as: ATM) outside the cell, also carry GPON packing forms (GPONEncapsulation Method; Hereinafter to be referred as: GEM) frame, GEM is not only adapting protocol, and a kind of link layer protocol with exchange capacity, both be suitable for the encapsulation of the business datums such as Ethernet especially, also being suitable for the encapsulation of the business datums such as TDM, is one of more satisfactory scheme of integrated service access.
In realizing process of the present invention, the inventor finds that in prior art, there are the following problems at least: in the multiple service supporting mode that prior art provides, and the situation that existence can't positioning service data; And prior art does not provide corresponding solution for this situation.
Summary of the invention
The embodiment of the present invention provides data encapsulation method, sealed in unit and the tributary unit in a kind of multi-service transmitting network, to realize by the frame search positioning service data.
The embodiment of the present invention provides the data encapsulation method in a kind of multi-service transmitting network, comprising:
Generate the frame head check byte of adaptation layer frame head according to the first frame head checking algorithm, described frame head check byte is inserted the frame head check field of described adaptation layer frame head;
Described adaptation layer frame head and the first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains after xor operation and the payload of adaptation layer frame are encapsulated in the payload of channel layer frame the business datum in the described multi-service transmitting network of the payload of described adaptation layer frame carrying;
Generate the frame head check byte of channel layer frame head according to the second frame head checking algorithm, described frame head check byte is inserted the frame head check field of described channel layer frame head;
Described channel layer frame head and the second bit pattern are carried out xor operation, and the channel layer frame head that obtains after xor operation and the payload of described channel layer frame are encapsulated as the channel layer frame.
The embodiment of the present invention also provides the de-encapsulation method of the data in a kind of multi-service transmitting network, comprising:
According to bandwidth map placed channel layer frame slot, data flow in described channel layer frame slot and the 3rd bit pattern are carried out xor operation, and the bit pattern that adopts when in described the 3rd bit pattern and channel layer frame encapsulation process, the channel layer frame head being carried out xor operation is identical;
Data flow in the channel layer frame slot that obtains after to xor operation by the 3rd frame head checking algorithm is carried out verification, determine the position of described channel layer frame head, the frame head checking algorithm that adopts in described the 3rd frame head checking algorithm and described channel layer frame encapsulation process is identical;
Extract the adaptation layer data flow according to the position of described channel layer frame head, described adaptation layer data flow and the 4th bit pattern are carried out xor operation, and the bit pattern that adopts when in described the 4th bit pattern and adaptation layer frame encapsulation process, the adaptation layer frame head being carried out xor operation is identical;
The adaptation layer frame data stream that obtains after to xor operation by the 4th frame head checking algorithm is carried out verification, determines the position of described adaptation layer frame head, and the frame head checking algorithm that adopts in described the 4th frame head checking algorithm and described adaptation layer frame encapsulation process is identical;
Extract the payload of described adaptation layer frame head and adaptation layer frame according to the position of described adaptation layer frame head, the business datum in the described multi-service transmitting network of payload carrying of described adaptation layer frame.
The embodiment of the present invention also provides a kind of sealed in unit, comprising:
The first frame head check byte generation module is used for generating according to the first frame head checking algorithm the frame head check byte of adaptation layer frame head, and described frame head check byte is inserted the frame head check field of described adaptation layer frame head;
Adaptation layer frame head xor operation module, be used for described adaptation layer frame head and the first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains after xor operation and the payload of adaptation layer frame are encapsulated in the payload of channel layer frame the business datum in the described multi-service transmitting network of the payload of described adaptation layer frame carrying;
The second frame head check byte generation module is used for generating according to the second frame head checking algorithm the frame head check byte of channel layer frame head, and described frame head check byte is inserted the frame head check field of described channel layer frame head;
Channel layer frame head xor operation module is used for described channel layer frame head and the second bit pattern are carried out xor operation, and the channel layer frame head that obtains after xor operation and the payload of described channel layer frame are encapsulated as the channel layer frame.
The embodiment of the present invention also provides a kind of decapsulation equipment, comprising:
The first data flow xor operation module, be used for according to bandwidth map placed channel layer frame slot, data flow in described channel layer frame slot and the 3rd bit pattern are carried out xor operation, and the bit pattern that adopts when in described the 3rd bit pattern and channel layer frame encapsulation process, the channel layer frame head being carried out xor operation is identical;
Channel layer frame search module, data flow in the channel layer frame slot that is used for obtaining after to described the first data flow xor operation module xor operation by the 3rd frame head checking algorithm is carried out verification, determine the position of described channel layer frame head, the frame head checking algorithm that adopts in described the 3rd frame head checking algorithm and described channel layer frame encapsulation process is identical;
Channel layer frame decapsulation module is used for extracting the adaptation layer data flow according to the position of the definite channel layer frame head of described channel layer frame search module;
The second data flow xor operation module, be used for adaptation layer data flow and the 4th bit pattern that described channel layer frame decapsulation module is extracted are carried out xor operation, the bit pattern that adopts when in described the 4th bit pattern and adaptation layer frame encapsulation process, the adaptation layer frame head being carried out xor operation is identical;
Adaptation layer frame search module, the adaptation layer frame data stream that is used for obtaining after to described the second data flow xor operation module xor operation by the 4th frame head checking algorithm is carried out verification, determine the position of described adaptation layer frame head, the frame head checking algorithm that adopts in described the 4th frame head checking algorithm and described adaptation layer frame encapsulation process is identical;
Adaptation layer frame decapsulation module is used for according to the position described adaptation layer frame head of extraction of the definite adaptation layer frame head of described adaptation layer frame search module and the payload of adaptation layer frame, the business datum in the described multi-service transmitting network of payload carrying of described adaptation layer frame.
The embodiment of the present invention also provides a kind of tributary unit, comprising:
Sealed in unit is used for the frame head check byte according to the first frame head checking algorithm generation adaptation layer frame head, described frame head check byte is inserted the frame head check field of described adaptation layer frame head; Described adaptation layer frame head and the first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains after xor operation and the payload of adaptation layer frame are encapsulated in the payload of channel layer frame the business datum in the described multi-service transmitting network of the payload of described adaptation layer frame carrying; Generate the frame head check byte of channel layer frame head according to the second frame head checking algorithm, described frame head check byte is inserted the frame head check field of described channel layer frame head; Described channel layer frame head and the second bit pattern are carried out xor operation, and the channel layer frame head that obtains after xor operation and the payload of described channel layer frame are encapsulated as the channel layer frame;
Decapsulation equipment, be used for according to bandwidth map placed channel layer frame slot, data flow in described channel layer frame slot and the 3rd bit pattern are carried out xor operation, and the bit pattern that adopts when in described the 3rd bit pattern and channel layer frame encapsulation process, the channel layer frame head being carried out xor operation is identical; Data flow in the channel layer frame slot that obtains after to xor operation by the 3rd frame head checking algorithm is carried out verification, determine the position of described channel layer frame head, the frame head checking algorithm that adopts in described the 3rd frame head checking algorithm and described channel layer frame encapsulation process is identical; Extract the adaptation layer data flow according to the position of described channel layer frame head, described adaptation layer data flow and the 4th bit pattern are carried out xor operation, and the bit pattern that adopts when in described the 4th bit pattern and adaptation layer frame encapsulation process, the adaptation layer frame head being carried out xor operation is identical; The adaptation layer frame data stream that obtains after to xor operation by the 4th frame head checking algorithm is carried out verification, determines the position of described adaptation layer frame head, and the frame head checking algorithm that adopts in described the 4th frame head checking algorithm and described adaptation layer frame encapsulation process is identical; And according to the position described adaptation layer frame head of extraction of described adaptation layer frame head and the payload of adaptation layer frame.
By the embodiment of the present invention, sealed in unit carries out xor operation with adaptation layer frame head and channel layer frame head and bit pattern, and decapsulation equipment carries out xor operation with identical bit pattern to the data flow that receives again, recovers adaptation layer frame head and channel layer frame head; Then decapsulation equipment is determined the position of adaptation layer frame head and channel layer frame head by the frame head checking algorithm, has realized the accurate location of channel layer frame and adaptation layer frame.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do one to the accompanying drawing of required use in embodiment or description of the Prior Art and introduce simply, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of an embodiment of multi-service transmitting network of the present invention;
Fig. 2 is the application scenarios schematic diagram of the present invention's network shown in Figure 1;
Fig. 3 is transmission container (the Transmission Container in multi-service transmitting network of the present invention; Hereinafter to be referred as: the TCONT) structural representation of an embodiment of intersection equipment;
Fig. 4 is the schematic diagram of channel layer frame structure of the present invention and an embodiment of adaptation layer frame structure;
Fig. 5 is that TDM business of the present invention is mapped to enhancement mode GEM (Enhanced GEM; Hereinafter to be referred as: the EGEM) schematic diagram of an embodiment of frame;
Fig. 6 is the schematic diagram that Ethernet service of the present invention is mapped to an embodiment of EGEM frame;
Fig. 7 is that GPON signal map of the present invention is to the schematic diagram of an embodiment of EGEM frame;
Fig. 8 is the schematic diagram of channel layer frame structure of the present invention and another embodiment of adaptation layer frame structure;
Fig. 9 is the flow chart of the embodiment of data encapsulation method in multi-service transmitting network of the present invention;
Figure 10 is the flow chart of another embodiment of data encapsulation method in multi-service transmitting network of the present invention;
Figure 11 is the flow chart of the embodiment of data de-encapsulation method in multi-service transmitting network of the present invention;
Figure 12 is the flow chart of another embodiment of data de-encapsulation method in multi-service transmitting network of the present invention;
Figure 13 is the schematic diagram that the present invention searches an embodiment of frame state machine;
Figure 14 is the structural representation of an embodiment of sealed in unit of the present invention;
Figure 15 is the structural representation of another embodiment of sealed in unit of the present invention;
Figure 16 is the structural representation of an embodiment of decapsulation equipment of the present invention;
Figure 17 is the structural representation of an embodiment of tributary unit of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work belongs to the scope of protection of the invention.
Fig. 1 is the structural representation of an embodiment of multi-service transmitting network of the present invention, and Fig. 2 is the application scenarios schematic diagram of the present invention's network shown in Figure 1.As shown in Figure 2, the node on network rings is divided into two kinds of N node and S nodes, and the N node is common decentralized service access node, and the S node also possesses the function of docking with upper layer network except the function that possesses the N node.Any one node on network rings can directly transmit the business such as traditional TDM business and Ethernet data business, and EPON (Passive Optical Network can also be provided; Hereinafter to be referred as: PON) tributary interface also provides the uplink service interfaces such as 10GE at the S node.The type of service of this network carrying can comprise three kinds: (1) fixed-bandwidth (Fixed Bandwidth; Hereinafter to be referred as: FB) business is mainly used in carrying the business with bandwidth time-delay assurance, for example: TDM, synchronous digital hierarchy (Synchronous Digital Hierarchy; Hereinafter to be referred as: SDH)/Synchronous Optical Network (Synchronous Optical Network; Hereinafter to be referred as: SONET) or private line service etc.; (2) bandwidth assurance service namely guarantees bandwidth (Assured Bandwidth; Hereinafter to be referred as: AB) class business, for example: video, the networking telephone (Voice over Internet Protocol; Hereinafter to be referred as: VoIP) or the business such as special line; (3) assurance business as possible, (Best Effort namely does one's best; Hereinafter to be referred as: BE) class business, such as: common business of networking etc.For AB class and BE class business, network shown in Figure 2 is a kind of converying type network, and aggregation node is the S node, and the S node is realized double copies; For FB class business, network shown in Figure 2 is a kind of peer switch network, can be from business such as any one node transmission TDM, SDH/SONET or special lines.
As shown in Figure 1, this network configuration comprises adaptation layer, channel layer and physical layer three-decker, and level is few, processing of circuit is simple, reliability is high, save cost and power consumption, realizes simple.Adaptation layer is responsible for the miscellaneous service data in multi-service transmitting network are encapsulated and decapsulation according to unified EGEM frame format, and requirement is that each business is specified unique sign in network.Channel layer is responsible for according to principles such as type of service, priority and destination addresses, and a plurality of EGEM frames are formed dissimilar TCONT frame, adds path overhead, consists of channel layer, and can realize alarm end to end and conveying function monitoring to channel layer.Physical layer is responsible for all TCONT frames are formed transmission convergence layer (TransmissionConvergence; Hereinafter to be referred as TC) frame, add physical layer overhead, comprise that frame head is synchronous, administration overhead and bandwidth map etc., consist of physical layer, to facilitate communication and the management of main frame to each node in network, the convenient time slot allocation of adjusting each TCONT realizes the dynamic bandwidth adjustment.
A main feature of the network architecture shown in Figure 1 is, towards Dynamic Bandwidth Allocation (the Dynamic Bandwidth Assignment of the whole network; Hereinafter to be referred as: DBA) module and algorithm: each node detects, adds up and reports dynamic bandwidth request (the Dynamic BandwidthRequirement of inner each service port of this node; Hereinafter to be referred as: DBR), report main frame, main frame judges and calculates according to ring upper existing bandwidth resources, each node traffic type and priority etc., at last the bandwidth allocation information of each node is issued to each node, each node transmits data according to the bandwidth of distributing.The bandwidth allocation information that main frame issues each node is mainly bandwidth map (Bandwidth Map; Hereinafter to be referred as: BWmap), after receiving bandwidth map, each node is according to the size and number of bandwidth map assembling TCONT frame.
Service port in this network comprises traditional TDM service port, SDH/SONET/ATM service port, and the Ethernet data service port, and wherein the Ethernet data business can be through delivering to adaptation layer after the L2 exchange.Except these common form of services, be used for now transmission multiprotocol label switching (the Transport Multi-protocol Label Switching that grouping transmits mainstream technology; Hereinafter to be referred as: T-MPLS) service port and provider backbone bridging traffic engineering (Provider BackboneBridge-Traffic Engineering; Hereinafter to be referred as PBB-TE) service port, also can be used as the service port of this network.In order to dock with Access Layer optical fiber access technology, the GEM frame in GPON also can be used as the service port of the network architecture shown in Figure 1.
Fig. 3 is the structural representation of the embodiment of TCONT intersection equipment in multi-service transmitting network of the present invention, and as shown in Figure 3, this equipment can comprise: east orientation line unit 31, west are to line unit 32, TCONT cross unit 33 and tributary unit 34.
Wherein, east orientation line unit 31 and west are used for carrying out insertion and the extraction of synchronous, the expense of physical layer frame to line unit 32; TCONT cross unit 33 is used for the TCONT passage of this website is increased (add) or reduces (drop), and the break-through of the TCONT passage of non-website (TCONT place time slot constant) or exchange (TCONT place time slot change); Tributary unit 34 is used for the TCONT frame of this website is carried out adaptive/solution adapting operation, and the EGEM frame is carried out adaptive/solution adapting operation; Alternatively, tributary unit 34 can also be completed EGEM exchange, service bandwidth demand statistics and report, and the function such as Business Processing.
, can extract from tributary unit 34 by after TCONT cross unit 33 from the TCONT packet of east orientation line unit 31, also can send from the west to line unit 32; Increase by TCONT cross unit 33 from the TCONT packet of tributary unit 34, and come to send from east orientation line unit 31 together with the TCONT packet of line unit 32 westerly.
For east orientation line unit 31 and western to the synchronous situation of the line clock of line unit 32, each time slot position on the East and West direction circuit, TCONT passage place is fixed, the TCONT packet is also fixed the position in the time slot that distributes, and TCONT cross unit 33 does not need the TCONT idle packet in the TCONT time slot is increased and decreased operation.But for east orientation line unit 31 and western to the asynchronous situation of the line clock of line unit 32, owing between each TCONT passage, the TCONT idle packet being arranged, these TCONT idle packet can be used for absorbing the frequency difference of framing control.So-called framing control is exactly that the TCONT packet in the incoming frame of east orientation line unit 31 is extracted, comprise the TCONT idle packet, the TCONT packet is stored a frame in frame buffer (Buffer), then read TCONT packet in this frame buffer according to the west to the frame synchronization timing of line unit 32, increase or reduce the TCONT idle packet by the phase bit comparison and realize the speed adjustment, again above-mentioned TCONT packet is write again the west in the frame structure of line unit 32, still place these TCONT packets by the position of TCONT frame in bandwidth map.
When the write clock of east orientation line unit 31 faster than readout clock, when phase accumulation arrives certain position, automatically reduce by a TCONT idle packet in new framing, that is to say, former TCONT idle packet position is used to load the TCONT packet, be equivalent to that in transport network, common payload slows down, fill on the contrary a TCONT idle packet, thus realize east orientation line unit 31 and west to the TCONT of line unit 32 because of the different needed speed adjustment functions of line speed.When tributary unit 34 was encapsulated as the EGEM bag, the idle packet of EGEM parlor also can be used for adjusting the difference between service rate and TCONT payload area rate when business datum, and these idle packet are equivalent to just fill in; Equally, the effect of above TCONT idle packet is the frequency difference of adjusting between each network element, also to adopt the mode of just filling in, as long as the time slot of TCONT that DBA distributes to is slightly larger than the flow of actual TCONT packet, just can adopt the mode of just filling in, the mode of just filling in has been arranged, just can support east orientation line unit 31 and west to the asynchronous working of the line clock of line unit 32, as long as east orientation line unit 31 and west are no more than to the frequency difference between line unit 32 scope that can adjust.In the asynchronous working situation these TCONT time slots in east orientation line unit 31 and west in the physical layer frame structure of line unit 32 position with respect to frame synchronous byte be constant, the frequency difference of the identical time slot that is east orientation line unit 31 and west in the line unit 32 that changes, and TCONT packet and TCONT idle packet are also floated in the time slot that distributes.But all the flow than the TCONT packet of required transmission is large due to the capacity of the time slot that distributes, and occurs so do not have the situation of packet loss.After above-mentioned adjustment, just can realize the asynchronous working between network element.
In this TCONT intersection equipment, tributary unit 34 extracts the TCONT packet according to the bandwidth map that DBA distributes, this is only suitable for only having 1 TCONT packet in a TCONT passage, and the situation that the position of TCONT packet in the TCONT passage is fixing, for example: the starting position of TCONT time slot is the situation of the original position of TCONT packet.And be not suitable for having in 1 TCONT passage a plurality of TCONT packets or the TCONT packet unfixed situation in position in the TCONT time slot, for example asynchronous TCONT intersects the TCONT packet situation that float in the position in the TCONT time slot that causes.
For addressing the above problem, the embodiment of the present invention provides data encapsulation method and the de-encapsulation method in a kind of multi-service transmitting network, determines the position of channel layer frame head according to the frame head checking algorithm, realizes accurate placed channel layer frame.In a kind of implementation of the embodiment of the present invention, the channel layer frame head adopts identical frame head checking algorithm with the adaptation layer frame head, but sealed in unit carries out XOR with different bit pattern respectively with channel layer frame head and adaptation layer frame head, decapsulation equipment uses the bit pattern corresponding with sealed in unit to carry out XOR again, wherein, this bit pattern requires to have enough " 0,1 " upset rates; In the another kind of implementation of the embodiment of the present invention, the channel layer frame head adopts different frame head checking algorithms from the adaptation layer frame head.
Fig. 4 is the schematic diagram of channel layer frame structure of the present invention and an embodiment of adaptation layer frame structure, and in the present embodiment, the channel layer frame is the TCONT frame, and the adaptation layer frame is the EGEM frame.TCONT frame structure in the present embodiment and EGEM frame structure improve GPON downlink frame structure, can realize the unified carrying of multi-service.
The below describes in detail to TCONT frame structure shown in Figure 4 and EGEM frame structure.
1, EGEM frame
A, EGEM frame head be totally 5 bytes, each field implication is as follows: payload length indication PLI, 12 bits, be used to indicate the length of payload data, the unit of payload data is byte, the maximum length of payload data is 4095 bytes, if user data greater than this maximum length, the fragment that user data must be cut into less than 4095 bytes transmits; Service port sign (Port Identifier; Hereinafter to be referred as: Port-ID), 12 bits can provide at most 4096 unique service identifications; Payload type indication (Payload TypeIndicator; Hereinafter to be referred as: PTI), 3 bits are used to indicate the type of payload data and the position of this EGEM frame, see table 1 for details; Header error is controlled (Header Error Control; Hereinafter to be referred as: HEC), i.e. the frame head check field of EGEM frame head provides the cyclic redundancy check (CRC) of 13 bits.
Table 1
| PTI | Implication |
| 000 | User data, do not have congested, non-tail frame |
| 001 | User data, do not have congested, the tail frame |
| 010 | User data, have congested, non-tail frame |
| 011 | User data, have congested, the tail frame |
| 100 | Non-user data, Operations, Administration and Maintenance (Operation Administration and Maintenance; Hereinafter to be referred as: OAM) data |
| 101 | Keep |
| 110 | Keep |
| 111 | Keep |
B, on the basis of the GEM of GPON frame, the EGEM frame has increased purpose sign (DestinationNode Identifier; Hereinafter to be referred as: DN-ID) field and source sign (Source Node Identifier; Hereinafter to be referred as: SN-ID) field, the length of purpose identification field and source identification field can be 16 bits, purpose identification field and source identification field all can further be divided into two identification field: network node sign (Node Identifier; Hereinafter to be referred as: Node-ID), 6 bits; And, tributary port sign (TributaryInterface Identifier; Hereinafter to be referred as: TI-ID), 10 bits.Wherein, Node-ID shows can comprise at most 64 nodes in a ring network structure, TI-ID can with Port-ID together, identify wider type of service.Therefore, these three signs of Node-ID, TI-ID and Port-ID combine, each business in unique specified network by different level, for example: TI-ID can correspond to tributary card or the port in apparatus for network node: for the GPON branch road, this GPON branch road comprises a plurality of optical distribution networks (Optical Distribution Network; Hereinafter to be referred as ODN) interface, can be TI-ID of each ODN interface assignment, and then, the different business that continues as on the ONU of same ODN network distributes different Port-ID; For the TDM business, as the E1 business, can be first according to different veneer distribution T I-ID, be the different Port-ID of a plurality of E1 interface assignment in plate again, also can be directly the E1 interface assignment TI-ID all to intra-node, obviously, a kind of front method can obtain larger sign scope; For Ethernet service, TI-ID can be physical port, and Port-ID corresponds to VLAN (VirtualLocal Area Network; Hereinafter to be referred as: VLAN) sign etc.Be only below several examples of the method for identification service, the embodiment of the present invention is not limited to this, and the method for any correctly identification service all should fall into the protection range of the embodiment of the present invention.
The length of C, EGEM frame payload section is specified by PLI, and is variable between 0～4095 byte.(1) for the mapping of TDM business, can be according to the speed of the speed of TDM business itself and EGEM frame poor, in the every increase of data buffer storage or when reducing by 1 byte, adaptively, adjust the value of a PLI in ± 1 bytes range; Fig. 5 is the schematic diagram that TDM business of the present invention is mapped to an embodiment of EGEM frame, as shown in Figure 5, when the TDM business is mapped to the EGEM frame, the TDM business datum is mapped to the EGEM payload section gets final product.(2) for Ethernet service, can be by abandoning frame period and lead code, guarantee the integrality of ethernet frame data, can determine the length of ethernet frame data according to the length field in ethernet frame, other field of ethernet frame is all regular length, thereby can determine the value of PLI, then, with destination address field (DAF), source address field, length/type field, media access control (the Media Access Control of ethernet frame; Hereinafter to be referred as: MAC) client data field and Frame Check Sequence (Frame Check Sequence; Hereinafter to be referred as: FCS) field mappings gets final product to the payload section of EGEM frame, and as shown in Figure 6, Fig. 6 is the schematic diagram that Ethernet service of the present invention is mapped to an embodiment of EGEM frame.During greater than 4095 byte, need to come burst to transmit this ethernet frame when the length of ethernet frame with a plurality of continuous EGEM frames.(3) because the EGEM frame is improved on the basis of GEM frame, so the EGEM frame can dock with the GPON signal well, only needs that GPON signal deblocking is installed to the GEM frame and gets final product, and here, the GEM frame is counted as the client signal of EGEM frame.Mapping from the GEM frame to EGEM, because variation has occured in the implication of Port-ID, therefore need to be Port-ID assignment again, correspondingly, also need to recomputate the HEC check value, the PLI in the GEM frame and the value of PTI, and payload data, can directly copy in EGEM frame corresponding territory, as shown in Figure 7, Fig. 7 is that GPON signal map of the present invention is to the schematic diagram of an embodiment of EGEM frame.
2, TCONT frame
A, TCONT frame head can also comprise other expansion sign except the payload data length T-PLI1 of TCONT frame, as: T-PLI2.The bandwidth that transmits data due to a TCONT passage allows to reach the even larger bandwidth range of 2.5G, 10G, and the payload length of TCONT frame will reach 38880 bytes, 155520 bytes or larger byte, and the indicating range that therefore T-PLI1 can be set is 20 bits.The frame head check field, i.e. HEC field provides the cyclic redundancy check (CRC) of 13 bits.
B, in the overhead area of TCONT frame, allocation identification (Alloc-ID) can be 2 bytes, totally 16 bits are divided into two identification field: network node sign (Node-ID) 6 bits, TCONT number of frames (Sequence Identifier; Hereinafter to be referred as: Seq-ID) 10 bits this means to form at most 1024 TCONT frames in a node.Simple BIP-8 verification is adopted in the BIP verification.Monitoring byte M1 includes 4 bit FEE far end error indication (Remote Error Indication; Hereinafter to be referred as: REI), 1 bit remote bug indication (Remote Defect Indication; Hereinafter to be referred as: RDI), 2 bit bandwidth request DBR.
The length of C, TCONT frame payload section is specified by T-PLI1, and TCONT frame payload section includes a plurality of EGEM frames.Need to prove, the TCONT frame in the embodiment of the present invention and the TCONT frame in GPON have a great difference.In GPON, TCONT is only in the Access Layer scope, at optical line terminal (Optical Line Terminal; Hereinafter to be referred as: OLT) and optical network unit (Optical NetworkUnit; Hereinafter to be referred as: the up direction multiple spot ONU) is applicable to the scope of a bit.TCONT in GPON; it is mainly the realization for the different service types qos requirement; in GPON, the administration overhead of TCONT is except up direction signalling path, up direction power level sequence and the report of up dynamic bandwidth; do not define other administration overhead; as data verification, performance and alarm monitoring etc., thus in GPON the OAM ability of TCONT a little less than, be difficult to realize other function; as interconnection, monitoring and protection etc., can not expand to the metropolitan area network scope and use.In embodiments of the present invention, channel layer TCONT frame inheritance realize the mechanism of QoS in GPON, inherited the structure of a plurality of EGEM frame of payload section framing, and kept the dynamic bandwidth function of reporting, in the time of can changing in the type of service bandwidth of carrying, initiate the Dynamic Bandwidth Allocation request.Aspect OAM, the TCONT frame of the embodiment of the present invention has increased the frame head positioning function, to adapt to application scenario widely; Increased the data check function, and performance and alarm monitoring, can realize that channel layer monitors end to end and manage, and can realize the protection of channel layer and switch.The TCONT frame of the embodiment of the present invention has possessed more perfect OAM(Operation Administration Maintenance), in the time slot that this TCONT frame distributes, can play a real independently effect of Transfer pipe.In addition, compare synchronous digital hierarchy (Synchronous Digital Hierarchy; Hereinafter to be referred as: (the Virtual Container of the virtual container SDH); Hereinafter to be referred as: VC), the length of the TCONT frame of the embodiment of the present invention can be that unit changes by 1 byte, bandwidth availability ratio is very high, faying face is to the DBA mechanism of the whole network, realize that the dynamic bandwidth adjustment is also very convenient, be particularly suitable for Web TV (Internet ProtocolTelevision; Hereinafter to be referred as: IPTV), bandwidth on-demand (Bandwidth On Demand; Hereinafter to be referred as: the business such as BOD).
In the present embodiment, the frame head checking algorithm that TCONT frame head and EGEM frame head adopt is the HEC algorithm.
Fig. 8 is the schematic diagram of channel layer frame structure of the present invention and another embodiment of adaptation layer frame structure, different from frame structure shown in Figure 4 is, in frame structure shown in Figure 8, the frame head checking algorithm that the TCONT frame head adopts is the HEC algorithm, and the frame head checking algorithm that the EGEM frame head adopts is the cHEC algorithm; The implication of all the other fields is identical with frame structure shown in Figure 4, does not repeat them here.
Be introduced below by method for packing and the de-encapsulation method of specific embodiment to above-mentioned channel layer frame and adaptation layer frame.
Fig. 9 is the flow chart of the embodiment of data encapsulation method in multi-service transmitting network of the present invention, and as shown in Figure 9, this embodiment comprises:
Step 901 according to the frame head check byte of the first frame head checking algorithm generation adaptation layer frame head, is inserted this frame head check byte the frame head check field of adaptation layer frame head.
Step 902 is carried out xor operation with this adaptation layer frame head and the first bit pattern, and the adaptation layer frame head that obtains after xor operation and the payload of adaptation layer frame are encapsulated in the payload of channel layer frame; Wherein, the business datum in the payload of this adaptation layer frame carrying multi-service transmitting network.
Step 903 according to the frame head check byte of the second frame head checking algorithm generation channel layer frame head, is inserted this frame head check byte the frame head check field of above-mentioned channel layer frame head.
Step 904 is carried out xor operation with channel layer frame head and the second bit pattern, and the channel layer frame head that obtains after xor operation and the payload of channel layer frame are encapsulated as the channel layer frame.
In the present embodiment, above-mentioned the first frame head checking algorithm and the second frame head checking algorithm can be identical frame head checking algorithm, also can be different frame head checking algorithms.
When the first frame head checking algorithm and the second frame head checking algorithm were identical frame head checking algorithm, the first bit pattern and the second bit pattern were different bit patterns; When the first frame head checking algorithm and the second frame head checking algorithm were different frame head checking algorithm, the first bit pattern and the second bit pattern can be identical or different bit pattern.
In above-described embodiment, sealed in unit carries out xor operation with adaptation layer frame head and channel layer frame head and bit pattern, and then the adaptation layer frame head after xor operation and channel layer frame head are encapsulated in adaptation layer frame and channel layer frame, the identical bit pattern of decapsulation equipment utilization carries out xor operation to receiving data stream, adaptation layer frame head and channel layer frame head can be recovered, thereby accurate placed channel layer frame and adaptation layer frame can be realized.
Figure 10 is the flow chart of another embodiment of data encapsulation method in multi-service transmitting network of the present invention, and in the present embodiment, the adaptation layer frame is the EGEM frame, and the channel layer frame is the TCONT frame; The first frame head checking algorithm and the second frame head checking algorithm are identical frame head checking algorithm, be that EGEM frame head and TCONT frame head adopt identical frame head checking algorithm, the present embodiment is controlled (Header Error Control take the first frame head checking algorithm and the second frame head checking algorithm as header error; Hereinafter to be referred as: HEC) algorithm is that example describes.
As shown in figure 10, this embodiment comprises:
In the present embodiment, the frame head check field of EGEM frame head is the HEC field.
In the present embodiment, the length of the frame head check byte of generation is 13 bits.The HEC algorithm is a kind of coding method that can correct 2 bit mistakes and detect 3 bit mistakes, and the generator polynomial of HEC algorithm is x
12+ x
10+ x
8+ x
5+ x
4+ x
3+ 1.Last 1 bit of the frame head check byte of 13 bits is parity check bit, this make in the EGEM frame head of 40 bits promising " 1 " the position add up to even number.
In the present embodiment, the first bit pattern can be 0xB6AB31E055.Fit within the process of payload of TCONT frame at the EGEM frame, during less than the bandwidth of the payload of TCONT frame, can carry out rate adapted when the bandwidth of EGEM frame with idle (EGEM IDLE) frame of EGEM; EGEM IDLE frame is that all bits of frame head are the sequence of " 0 ".In order to make EGEM IDLE frame have enough " 0; 1 " the upset rate is so that decapsulation equipment is located the EGEM frame, and sealed in unit can carry out xor operation with EGEM frame head and the first bit pattern, wherein, the first bit pattern must have enough " 0,1 " upset rates.Then, then with the EGEM frame head that obtains after xor operation and the payload of EGEM frame be encapsulated in the payload of TCONT frame.
In the present embodiment, the frame head check field of TCONT frame is the HEC field.
In the present embodiment, the second bit pattern can be 0xAAAAAAAAAA.Fit within the process of physical layer payload at the TCONT frame, in order to carry out the adjustment of East and West direction line speed at the TCONT cross unit, use TCONT free time (TCONT IDLE) frame in the front and back of TCONT time slot that frame distributes and fill, TCONT IDLE frame is that all bits of frame head are the sequence of " 0 " entirely.In order to make the TCONTIDLE frame have enough " 0; 1 " the upset rate is so that decapsulation equipment is located the TCONT frame; sealed in unit can carry out xor operation with TCONT frame head and the second bit pattern usually; wherein; the second bit pattern must have enough " 0; 1 " the upset rate, and then the TCONT frame head that obtains after xor operation and the payload of TCONT frame are encapsulated as the TCONT frame.
In the present embodiment, the first frame head checking algorithm and the second frame head checking algorithm are identical frame head checking algorithm, the first frame head checking algorithm and the second frame head checking algorithm also can be different frame head checking algorithms, for example: the first frame head checking algorithm can be the HEC algorithm, and the second frame head checking algorithm can be controlled (core Header Error Control for the core header error; Hereinafter to be referred as: cHEC) algorithm, namely the TCONT frame head can adopt the HEC algorithm, and the EGEM frame head can adopt the cHEC algorithm.The cHEC algorithm is a kind of coding method that can correct 1 bit mistake and detect multi-bit errors.The generator polynomial of cHEC algorithm is x
16+ x
12+ x
5+ 1, there is no parity check bit.
At this moment, according to the data encapsulation method in the present invention's multi-service transmitting network that provides embodiment illustrated in fig. 10, in step 1003, the first bit pattern can be 0xB6AB31E0; In step 1006, the second bit pattern can be 0xB6AB31E055.Although front 4 bytes of the second bit pattern are the same with the first bit pattern, but because the TCONT frame head is different from the frame head checking algorithm that the EGEM frame head adopts, because the generator polynomial of different frame head checking algorithms is different, so decapsulation equipment can be distinguished TCONT frame head and EGEM frame head.
In above-described embodiment, sealed in unit carries out xor operation with EGEM frame head and TCONT frame head and bit pattern, and then the EGEM frame head after xor operation and TCONT frame head are encapsulated in EGEM frame and TCONT frame, the identical bit pattern of decapsulation equipment utilization carries out xor operation to receiving data stream, EGEM frame head and TCONT frame head can be recovered, thereby TCONT frame and EGEM frame can be realized accurately locating.The method that the present embodiment provides, no matter the TCONT frame head adopts different frame head checking algorithms with the EGEM frame head, still adopt identical frame head checking algorithm but carry out XOR from different bit pattern, can realize the accurate location of TCONT frame and EGEM frame, and realizing simple.
Figure 11 is the flow chart of the embodiment of data de-encapsulation method in multi-service transmitting network of the present invention, and as shown in figure 11, this embodiment comprises:
In the present embodiment, the 3rd frame head checking algorithm and the 4th frame head checking algorithm can be identical frame head checking algorithm, also can be different frame head checking algorithms.
When the 3rd frame head checking algorithm and the 4th frame head checking algorithm were identical frame head checking algorithm, the 3rd bit pattern and the 4th bit pattern were different bit patterns; When the 3rd frame head checking algorithm and the 4th frame head checking algorithm were different frame head checking algorithm, the 3rd bit pattern and the 4th bit pattern were identical or different bit pattern.
In above-described embodiment, decapsulation equipment utilization bit pattern carries out xor operation to the data flow that receives, and the bit pattern that adopts in this bit pattern and encapsulation process is identical; And then determine the position of frame head by the frame head checking algorithm, thereby accurately placed channel layer frame and adaptation layer frame.
Figure 12 is the flow chart of another embodiment of data de-encapsulation method in multi-service transmitting network of the present invention, and in this embodiment, the adaptation layer frame is the EGEM frame, and the channel layer frame is the TCONT frame; The 3rd frame head checking algorithm and the 4th frame head checking algorithm are identical frame head checking algorithm, and the present embodiment is the HEC algorithm take the 3rd frame head checking algorithm and the 4th frame head checking algorithm and describes as example.
As shown in figure 12, this embodiment comprises:
In the present embodiment, the 3rd bit pattern can be 0xAAAAAAAAAA.Particularly, sealed in unit reconciliation sealed in unit can be made an appointment and the TCONT frame head be carried out the bit pattern of xor operation.
In the present embodiment, the 3rd frame head checking algorithm is the HEC algorithm, and particularly, sealed in unit is conciliate the sealed in unit frame head checking algorithm that the TCONT frame head adopts of can making an appointment.
In the present embodiment, determine that the position of TCONT frame head is specifically as follows:
Start one and search the frame state machine, this initial condition of searching the frame state machine is for searching frame state, and Figure 13 is the schematic diagram that the present invention searches an embodiment of frame state machine.Searching under frame state, carrying out the HEC verification by the method for the sliding window of byte, from the original position of TCONT time slot, 5 continuous bytes are carried out the HEC verification, if these 5 bytes satisfy the HEC algorithm, can determine correctly to search 1 TCONT frame head, enter presynchronization state; If these 5 bytes do not satisfy the HEC algorithm, 1 byte of sliding, then 5 continuous thereafter bytes are carried out the HEC verification.Under presynchronization state, can search according to the PLI in the TCONT frame head that searches 5 bytes of carrying out HEC verification next time; If HEC verification next time is correct, think and correctly search 1 TCONT frame head, enter synchronous regime, search frame state otherwise enter.Under synchronous regime, find 5 bytes of HEC verification next time according to the PLI of TCONT frame head; If HEC verification next time is correct, keep synchronous regime, search frame state otherwise enter.
In the present embodiment, the 4th bit pattern can be 0xB6AB31E055, and particularly, sealed in unit reconciliation sealed in unit can be made an appointment and the EGEM frame head be carried out the bit pattern of xor operation.
In the present embodiment, when extracting the EGEM data flow, first buffer memory step 1202 is searched in the frame process data flow of TCONT time slot under presynchronization state, enters after synchronous regime the position of the TCONT frame head of determining according to step 1202 again, and the data flow under presynchronization state is carried out the TCONT decapsulation; Particularly, can extract expense and the TCONT payload of TCONT frame head expense, TCONT frame according to the position of TCONT frame head, the TCONT payload is the EGEM data flow.
In the present embodiment, the 4th frame head checking algorithm is the HEC algorithm, and particularly, sealed in unit is conciliate the sealed in unit frame head checking algorithm that the EGEM frame head adopts of can making an appointment.
Wherein, the EGEM data flow that obtains after to xor operation by the HEC algorithm is carried out verification, determines that the method for position of EGEM frame head is identical with the method that step 1202 provides, and does not repeat them here.
Particularly, when extracting the payload of EGEM frame head and EGEM frame, can first buffer memory step 1204 search the EGEM data flow under presynchronization state in the frame process, enter after synchronous regime again the position of the EGEM frame head of determining according to step 1204, extract EGEM frame head in the EGEM data flow and the payload of EGEM frame.
Data de-encapsulation method in the multi-service transmitting network that above-described embodiment provides the embodiment of the present invention as the HEC algorithm as example take the 3rd frame head checking algorithm and the 4th frame head checking algorithm is introduced, data de-encapsulation method in multi-service transmitting network when the 3rd frame head checking algorithm and the 4th frame head checking algorithm are different frame head checking algorithm is similar with it, does not repeat them here.
In above-described embodiment, decapsulation equipment utilization bit pattern carries out xor operation to the data flow that receives, and the bit pattern that adopts in this bit pattern and encapsulation process is identical; And then determine the position of frame head by the frame head checking algorithm, thereby accurately placed channel layer frame and adaptation layer frame; Data de-encapsulation method in the multi-service transmitting network that the present embodiment provides solved that the TCONT packet floats in the TCONT time slot or 1 TCONT time slot in when a plurality of TCONT packet is arranged, can't utilize bandwidth map to extract the problem of TCONT packet, be equally applicable to only have in 1 TCONT time slot the fixing situation in position of 1 TCONT packet and this TCONT packet, compatible good.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be completed by the hardware that program command is correlated with, aforesaid program can be stored in a computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Figure 14 is the structural representation of an embodiment of sealed in unit of the present invention, and the sealed in unit of this embodiment can arrange separately, also can be used as the part of tributary unit, realizes the flow process that the present invention is embodiment illustrated in fig. 9.As shown in figure 14, this sealed in unit can comprise: the first frame head check byte generation module 1401, adaptation layer frame head xor operation module 1402, the second frame head check byte generation module 1403 and channel layer frame head xor operation module 1404.
Wherein, the first frame head check byte generation module 1401 is used for generating according to the first frame head checking algorithm the frame head check byte of adaptation layer frame head, and this frame head check byte is inserted the frame head check field of adaptation layer frame head;
Adaptation layer frame head xor operation module 1402 is used for adaptation layer frame head and the first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains after xor operation and the payload of adaptation layer frame are encapsulated in the payload of channel layer frame; Business datum in the payload carrying multi-service transmitting network of this adaptation layer frame;
The second frame head check byte generation module 1403 is used for generating according to the second frame head checking algorithm the frame head check byte of channel layer frame head, and this frame head check byte is inserted the frame head check field of above-mentioned channel layer frame head;
Channel layer frame head xor operation module 1404 is used for channel layer frame head and the second bit pattern are carried out xor operation, and the channel layer frame head that obtains after xor operation and the payload of channel layer frame are encapsulated as the channel layer frame.
In the present embodiment, when the second frame head checking algorithm that the first frame head checking algorithm that adopts when the first frame head check byte generation module 1401 and the second frame head check byte generation module 1403 adopt was identical frame head checking algorithm, the second bit pattern that the first bit pattern that adaptation layer frame head xor operation module 1402 adopts and channel layer frame head xor operation module 1404 adopt was different bit pattern; Perhaps,
When the second frame head checking algorithm that the first frame head checking algorithm that adopts when the first frame head check byte generation module 1401 and the second frame head check byte generation module 1403 adopt was different frame head checking algorithm, the second bit pattern that the first bit pattern that adaptation layer frame head xor operation module 1402 adopts and channel layer frame head xor operation module 1404 adopt was identical or different bit pattern.
In above-described embodiment, adaptation layer frame head xor operation module 1402 is carried out xor operation with adaptation layer frame head and bit pattern, and the adaptation layer frame head after xor operation is encapsulated in the adaptation layer frame; Channel layer frame head xor operation module 1404 is carried out xor operation with channel layer frame head and bit pattern, and then the channel layer frame head after xor operation is encapsulated in the channel layer frame.The identical bit pattern of decapsulation equipment utilization carries out xor operation to receiving data stream, can recover adaptation layer frame head and channel layer frame head, thereby can realize accurate placed channel layer frame and adaptation layer frame.
Figure 15 is the structural representation of another embodiment of sealed in unit of the present invention, and the sealed in unit of this embodiment can arrange separately, also can be used as the part of tributary unit, realizes the flow process that the present invention is embodiment illustrated in fig. 10.As shown in figure 15, this sealed in unit can comprise: adaptation layer frame package module 1501, the first frame head check byte generation module 1502, adaptation layer frame head xor operation module 1503, channel layer frame package module 1504, the second frame head check byte generation module 1505 and channel layer frame head xor operation module 1506.
Wherein, adaptation layer frame package module 1501, be used for generating the expense of adaptation layer frame head and the expense of adaptation layer frame according to length, destination interface and the type of the business datum of multi-service transmitting network, the frame head verification of adaptation layer frame head is set to 0, and business datum is encapsulated in the payload of this adaptation layer frame the business datum in the i.e. payload of adaptation layer frame carrying multi-service transmitting network;
The first frame head check byte generation module 1502 is used for generating according to the first frame head checking algorithm the frame head check byte of adaptation layer frame head, and this frame head check byte is inserted the frame head check field of adaptation layer frame head;
Adaptation layer frame head xor operation module 1503 is used for adaptation layer frame head and the first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains after xor operation and the payload of adaptation layer frame are encapsulated in the payload of channel layer frame;
Channel layer frame package module 1504 is used for generating the expense of channel layer frame head and the expense of channel layer frame; Particularly, channel layer frame package module 1504 generates PLI according to the payload length of channel layer frame; Report timer to generate channel layer frame head expense M1 according to decapsulation equipment to the BIP check results of channel layer frame and DBR; AllocID, DBR and BIP are inserted in the channel layer frame overhead; The value of the frame head check field of channel layer frame head is made as 0;
The second frame head check byte generation module 1505 is used for generating according to the second frame head checking algorithm the frame head check byte of channel layer frame head, and this frame head check byte is inserted the frame head check field of above-mentioned channel layer frame head;
Channel layer frame head xor operation module 1506 is used for channel layer frame head and the second bit pattern are carried out xor operation, and the channel layer frame head that obtains after xor operation and the payload of channel layer frame are encapsulated as the channel layer frame.
In the present embodiment, when the second frame head checking algorithm that the first frame head checking algorithm that adopts when the first frame head check byte generation module 1502 and the second frame head check byte generation module 1505 adopt was identical frame head checking algorithm, the second bit pattern that the first bit pattern that adaptation layer frame head xor operation module 1503 adopts and channel layer frame head xor operation module 1506 adopt was different bit pattern; Perhaps,
When the second frame head checking algorithm that the first frame head checking algorithm that adopts when the first frame head check byte generation module 1502 and the second frame head check byte generation module 1505 adopt was different frame head checking algorithm, the second bit pattern that the first bit pattern that adaptation layer frame head xor operation module 1503 adopts and channel layer frame head xor operation module 1506 adopt was identical or different bit pattern.
In above-described embodiment, adaptation layer frame head xor operation module 1503 is carried out xor operation with adaptation layer frame head and bit pattern, and the adaptation layer frame head after xor operation is encapsulated in the adaptation layer frame; Channel layer frame head xor operation module 1506 is carried out xor operation with channel layer frame head and bit pattern, and then the channel layer frame head after xor operation is encapsulated in the channel layer frame.The identical bit pattern of decapsulation equipment utilization carries out xor operation to receiving data stream, can recover adaptation layer frame head and channel layer frame head, thereby can realize accurate placed channel layer frame and adaptation layer frame.
Figure 16 is the structural representation of an embodiment of decapsulation equipment of the present invention, and the decapsulation equipment of this embodiment can arrange separately, also can be used as the part of tributary unit, realizes Figure 11 of the present invention or flow process embodiment illustrated in fig. 12.As shown in figure 16, this decapsulation equipment can comprise: the first data flow xor operation module 1601, channel layer frame search module 1602, channel layer frame decapsulation module 1603, the second data flow xor operation module 1604, adaptation layer frame search module 1605 and adaptation layer frame decapsulation module 1606.
Wherein, the first data flow xor operation module 1601, be used for according to bandwidth map placed channel layer frame slot, data flow in the channel layer frame slot and the 3rd bit pattern are carried out xor operation, and the bit pattern that adopts when in the 3rd bit pattern and channel layer frame encapsulation process, the channel layer frame head being carried out xor operation is identical;
Channel layer frame search module 1602, data flow in the channel layer frame slot that is used for obtaining after to the first data flow xor operation module 1601 xor operations by the 3rd frame head checking algorithm is carried out verification, determine the position of channel layer frame head, the frame head checking algorithm that adopts in the 3rd frame head checking algorithm and channel layer frame encapsulation process is identical;
Channel layer frame decapsulation module 1603, the adaptation layer data flow is extracted in the position that is used for the channel layer frame head definite according to channel layer frame search module 1602;
The second data flow xor operation module 1604, be used for adaptation layer data flow and the 4th bit pattern that channel layer frame decapsulation module 1603 is extracted are carried out xor operation, the bit pattern that adopts when in the 4th bit pattern and adaptation layer frame encapsulation process, the adaptation layer frame head being carried out xor operation is identical;
Adaptation layer frame search module 1605, the adaptation layer frame data stream that is used for obtaining after to the second data flow xor operation module 1604 xor operations by the 4th frame head checking algorithm is carried out verification, determine the position of adaptation layer frame head, the frame head checking algorithm that adopts in the 4th frame head checking algorithm and adaptation layer frame encapsulation process is identical;
Adaptation layer frame decapsulation module 1606, the payload of adaptation layer frame head and adaptation layer frame is extracted in the position that is used for the adaptation layer frame head definite according to adaptation layer frame search module 1605; Wherein, the business datum in the payload of this adaptation layer frame carrying multi-service transmitting network.
In the present embodiment, when the 4th frame head checking algorithm that the 3rd frame head checking algorithm that adopts when channel layer frame search module 1602 and adaptation layer frame search module 1605 adopt was identical frame head checking algorithm, the 4th bit pattern that the 3rd bit pattern that the first data flow xor operation module 1601 adopts and the second data flow xor operation module 1604 adopt was different bit pattern; Perhaps,
When the 4th frame head checking algorithm that the 3rd frame head checking algorithm that adopts when channel layer frame search module 1602 and adaptation layer frame search module 1605 adopt was different frame head checking algorithm, the 4th bit pattern that the 3rd bit pattern that the first data flow xor operation module 1601 adopts and the second data flow xor operation module 1604 adopt was identical or different bit pattern.
In above-described embodiment, the first data flow xor operation module 1601 and the second data flow xor operation module 1604 utilize bit pattern to carry out xor operation to the data flow that receives, and the bit pattern that adopts in this bit pattern and encapsulation process is identical; Then channel layer frame search module 1602 and adaptation layer frame search module 1605 are determined the position of frame head by the frame head checking algorithm, thus accurately placed channel layer frame and adaptation layer frame.
Figure 17 is the structural representation of an embodiment of tributary unit of the present invention, and as shown in figure 17, this tributary unit can comprise sealed in unit 1701 reconciliation sealed in units 1702.
Wherein, sealed in unit 1701 is used for the frame head check byte according to the first frame head checking algorithm generation adaptation layer frame head, this frame head check byte is inserted the frame head check field of above-mentioned adaptation layer frame head; This adaptation layer frame head and the first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains after xor operation and the payload of adaptation layer frame are encapsulated in the payload of channel layer frame, the business datum in the payload of this adaptation layer frame carrying multi-service transmitting network; Generate the frame head check byte of channel layer frame head according to the second frame head checking algorithm, above-mentioned frame head check byte is inserted the frame head check field of channel layer frame head; Channel layer frame head and the second bit pattern are carried out xor operation, and the channel layer frame head that obtains after xor operation and the payload of channel layer frame are encapsulated as the channel layer frame; Particularly, sealed in unit 1701 can be realized by Figure 14 of the present invention or sealed in unit shown in Figure 15.
Decapsulation equipment 1702, be used for according to bandwidth map placed channel layer frame slot, data flow in this channel layer frame slot and the 3rd bit pattern are carried out xor operation, and the bit pattern that adopts when in the 3rd bit pattern and channel layer frame encapsulation process, the channel layer frame head being carried out xor operation is identical; Data flow in the channel layer frame slot that obtains after to xor operation by the 3rd frame head checking algorithm is carried out verification, determines the position of channel layer frame head, and the frame head checking algorithm that adopts in the 3rd frame head checking algorithm and channel layer frame encapsulation process is identical; Extract the adaptation layer data flow according to the position of channel layer frame head, this adaptation layer data flow and the 4th bit pattern are carried out xor operation, the bit pattern that adopts when in the 4th bit pattern and adaptation layer frame encapsulation process, the adaptation layer frame head being carried out xor operation is identical; The adaptation layer frame data stream that obtains after to xor operation by the 4th frame head checking algorithm is carried out verification, determines the position of adaptation layer frame head, and the frame head checking algorithm that adopts in the 4th frame head checking algorithm and adaptation layer frame encapsulation process is identical; And according to the position extraction adaptation layer frame head of adaptation layer frame head and the payload of adaptation layer frame; Particularly, decapsulation equipment 1702 can be realized by the present invention's decapsulation equipment shown in Figure 16.
Above-mentioned tributary unit, sealed in unit 1701 carries out xor operation with adaptation layer frame head and channel layer frame head and bit pattern, decapsulation equipment 1702 carries out xor operation with identical bit pattern to the data flow that receives again, recovers adaptation layer frame head and channel layer frame head; Then decapsulation equipment 1702 is determined the position of adaptation layer frame head and channel layer frame head by the frame head checking algorithm, has realized the accurate location of channel layer frame and adaptation layer frame.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. the data encapsulation method in a multi-service transmitting network, is characterized in that, comprising:
Generate the frame head check byte of adaptation layer frame head according to the first frame head checking algorithm, described frame head check byte is inserted the frame head check field of described adaptation layer frame head;
Described adaptation layer frame head and the first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains after xor operation and the payload of adaptation layer frame are encapsulated in the payload of channel layer frame the business datum in the described multi-service transmitting network of the payload of described adaptation layer frame carrying;
Generate the frame head check byte of channel layer frame head according to the second frame head checking algorithm, described frame head check byte is inserted the frame head check field of described channel layer frame head;
Described channel layer frame head and the second bit pattern are carried out xor operation, and the channel layer frame head that obtains after xor operation and the payload of described channel layer frame are encapsulated as the channel layer frame;
Described the first frame head checking algorithm and described the second frame head checking algorithm are identical frame head checking algorithm, and described the first bit pattern and described the second bit pattern are different bit patterns; Perhaps,
Described the first frame head checking algorithm and described the second frame head checking algorithm are different frame head checking algorithms, and described the first bit pattern and described the second bit pattern are identical or different bit pattern.
2. the data de-encapsulation method in a multi-service transmitting network, is characterized in that, comprising:
According to bandwidth map placed channel layer frame slot, data flow in described channel layer frame slot and the 3rd bit pattern are carried out xor operation, and the bit pattern that adopts when in described the 3rd bit pattern and channel layer frame encapsulation process, the channel layer frame head being carried out xor operation is identical;
Data flow in the channel layer frame slot that obtains after to xor operation by the 3rd frame head checking algorithm is carried out verification, determine the position of described channel layer frame head, the frame head checking algorithm that adopts in described the 3rd frame head checking algorithm and described channel layer frame encapsulation process is identical;
Extract the adaptation layer data flow according to the position of described channel layer frame head, described adaptation layer data flow and the 4th bit pattern are carried out xor operation, and the bit pattern that adopts when in described the 4th bit pattern and adaptation layer frame encapsulation process, the adaptation layer frame head being carried out xor operation is identical;
The adaptation layer frame data stream that obtains after to xor operation by the 4th frame head checking algorithm is carried out verification, determines the position of described adaptation layer frame head, and the frame head checking algorithm that adopts in described the 4th frame head checking algorithm and described adaptation layer frame encapsulation process is identical;
Extract the payload of described adaptation layer frame head and adaptation layer frame according to the position of described adaptation layer frame head, the business datum in the described multi-service transmitting network of payload carrying of described adaptation layer frame.
3. method according to claim 2, is characterized in that, described the 3rd frame head checking algorithm and described the 4th frame head checking algorithm are identical frame head checking algorithm, and described the 3rd bit pattern and described the 4th bit pattern are different bit patterns; Perhaps,
Described the 3rd frame head checking algorithm and described the 4th frame head checking algorithm are different frame head checking algorithms, and described the 3rd bit pattern and described the 4th bit pattern are identical or different bit pattern.
4. a sealed in unit, is characterized in that, comprising:
The first frame head check byte generation module is used for generating according to the first frame head checking algorithm the frame head check byte of adaptation layer frame head, and described frame head check byte is inserted the frame head check field of described adaptation layer frame head;
Adaptation layer frame head xor operation module, be used for described adaptation layer frame head and the first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains after xor operation and the payload of adaptation layer frame are encapsulated in the payload of channel layer frame the business datum in the described multi-service transmitting network of the payload of described adaptation layer frame carrying;
The second frame head check byte generation module is used for generating according to the second frame head checking algorithm the frame head check byte of channel layer frame head, and described frame head check byte is inserted the frame head check field of described channel layer frame head;
Channel layer frame head xor operation module is used for described channel layer frame head and the second bit pattern are carried out xor operation, and the channel layer frame head that obtains after xor operation and the payload of described channel layer frame are encapsulated as the channel layer frame;
The second frame head checking algorithm that the first frame head checking algorithm that described the first frame head check byte generation module adopts and described the second frame head check byte generation module adopt is identical frame head checking algorithm, and the second bit pattern that the first bit pattern that described adaptation layer frame head xor operation module adopts and described channel layer frame head xor operation module adopt is different bit pattern; Perhaps,
The second frame head checking algorithm that the first frame head checking algorithm that described the first frame head check byte generation module adopts and described the second frame head check byte generation module adopt is different frame head checking algorithm, and the second bit pattern that the first bit pattern that described adaptation layer frame head xor operation module adopts and described channel layer frame head xor operation module adopt is identical or different bit pattern.
5. sealed in unit according to claim 4, is characterized in that, also comprises:
Adaptation layer frame package module, the length, destination interface and the type that are used for according to business datum generate the expense of described adaptation layer frame head and the expense of described adaptation layer frame, and described business datum are encapsulated in the payload of described adaptation layer frame;
Channel layer frame package module is used for generating the expense of described channel layer frame head and the expense of described channel layer frame.
6. a decapsulation equipment, is characterized in that, comprising:
The first data flow xor operation module, be used for according to bandwidth map placed channel layer frame slot, data flow in described channel layer frame slot and the 3rd bit pattern are carried out xor operation, and the bit pattern that adopts when in described the 3rd bit pattern and channel layer frame encapsulation process, the channel layer frame head being carried out xor operation is identical;
Channel layer frame search module, data flow in the channel layer frame slot that is used for obtaining after to described the first data flow xor operation module xor operation by the 3rd frame head checking algorithm is carried out verification, determine the position of described channel layer frame head, the frame head checking algorithm that adopts in described the 3rd frame head checking algorithm and described channel layer frame encapsulation process is identical;
Channel layer frame decapsulation module is used for extracting the adaptation layer data flow according to the position of the definite channel layer frame head of described channel layer frame search module;
The second data flow xor operation module, be used for adaptation layer data flow and the 4th bit pattern that described channel layer frame decapsulation module is extracted are carried out xor operation, the bit pattern that adopts when in described the 4th bit pattern and adaptation layer frame encapsulation process, the adaptation layer frame head being carried out xor operation is identical;
Adaptation layer frame search module, the adaptation layer frame data stream that is used for obtaining after to described the second data flow xor operation module xor operation by the 4th frame head checking algorithm is carried out verification, determine the position of described adaptation layer frame head, the frame head checking algorithm that adopts in described the 4th frame head checking algorithm and described adaptation layer frame encapsulation process is identical;
Adaptation layer frame decapsulation module is used for according to the position described adaptation layer frame head of extraction of the definite adaptation layer frame head of described adaptation layer frame search module and the payload of adaptation layer frame, the business datum in the described multi-service transmitting network of payload carrying of described adaptation layer frame.
7. decapsulation equipment according to claim 6, it is characterized in that, the 4th frame head checking algorithm that the 3rd frame head checking algorithm that described channel layer frame search module adopts and described adaptation layer frame search module adopt is identical frame head checking algorithm, and the 4th bit pattern that the 3rd bit pattern that described the first data flow xor operation module adopts and described the second data flow xor operation module adopt is different bit pattern; Perhaps,
The 4th frame head checking algorithm that the 3rd frame head checking algorithm that described channel layer frame search module adopts and described adaptation layer frame search module adopt is different frame head checking algorithm, and the 4th bit pattern that the 3rd bit pattern that described the first data flow xor operation module adopts and described the second data flow xor operation module adopt is identical or different bit pattern.
8. the tributary unit in a multi-service transmitting network, is characterized in that, comprising:
Sealed in unit is used for the frame head check byte according to the first frame head checking algorithm generation adaptation layer frame head, described frame head check byte is inserted the frame head check field of described adaptation layer frame head; Described adaptation layer frame head and the first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains after xor operation and the payload of adaptation layer frame are encapsulated in the payload of channel layer frame the business datum in the described multi-service transmitting network of the payload of described adaptation layer frame carrying; Generate the frame head check byte of channel layer frame head according to the second frame head checking algorithm, described frame head check byte is inserted the frame head check field of described channel layer frame head; Described channel layer frame head and the second bit pattern are carried out xor operation, and the channel layer frame head that obtains after xor operation and the payload of described channel layer frame are encapsulated as the channel layer frame;
Decapsulation equipment, be used for according to bandwidth map placed channel layer frame slot, data flow in described channel layer frame slot and the 3rd bit pattern are carried out xor operation, and the bit pattern that adopts when in described the 3rd bit pattern and channel layer frame encapsulation process, the channel layer frame head being carried out xor operation is identical; Data flow in the channel layer frame slot that obtains after to xor operation by the 3rd frame head checking algorithm is carried out verification, determine the position of described channel layer frame head, the frame head checking algorithm that adopts in described the 3rd frame head checking algorithm and described channel layer frame encapsulation process is identical; Extract the adaptation layer data flow according to the position of described channel layer frame head, described adaptation layer data flow and the 4th bit pattern are carried out xor operation, and the bit pattern that adopts when in described the 4th bit pattern and adaptation layer frame encapsulation process, the adaptation layer frame head being carried out xor operation is identical; The adaptation layer frame data stream that obtains after to xor operation by the 4th frame head checking algorithm is carried out verification, determines the position of described adaptation layer frame head, and the frame head checking algorithm that adopts in described the 4th frame head checking algorithm and described adaptation layer frame encapsulation process is identical; And according to the position described adaptation layer frame head of extraction of described adaptation layer frame head and the payload of adaptation layer frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910207790 CN102055727B (en) | 2009-10-30 | 2009-10-30 | Data encapsulation method, encapsulation equipment and branch unit in multi-service transport network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910207790 CN102055727B (en) | 2009-10-30 | 2009-10-30 | Data encapsulation method, encapsulation equipment and branch unit in multi-service transport network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102055727A CN102055727A (en) | 2011-05-11 |
| CN102055727B true CN102055727B (en) | 2013-06-26 |
Family
ID=43959659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910207790 Active CN102055727B (en) | 2009-10-30 | 2009-10-30 | Data encapsulation method, encapsulation equipment and branch unit in multi-service transport network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102055727B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9537779B2 (en) * | 2013-10-11 | 2017-01-03 | Huawei Technologies Co., Ltd. | System and method for real-time traffic delivery |
| CN110084971A (en) * | 2019-04-25 | 2019-08-02 | 益逻触控系统公司 | The operating method and self-service terminal of self-service terminal |
| CN112312184B (en) * | 2019-07-30 | 2023-01-13 | 苏州华兴源创科技股份有限公司 | Video framing method |
| CN111555832B (en) * | 2020-04-22 | 2022-02-18 | 中国电子科技集团公司第五十四研究所 | 1+1 hot backup dual-channel synchronization and maintenance method based on continuous frame positioning |
| CN111729293B (en) * | 2020-08-28 | 2020-12-22 | 腾讯科技（深圳）有限公司 | Data processing method, device and storage medium |
| CN114338828B (en) * | 2020-09-30 | 2024-05-24 | 中国电子科技集团公司第五十四研究所 | Communication method, communication device and computer storage medium |
| CN117155523B (en) * | 2023-10-30 | 2024-01-26 | 杭州芯旗电子技术有限公司 | Multi-rate data framing device and method based on FPGA |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1859382A (en) * | 2005-12-16 | 2006-11-08 | 华为技术有限公司 | Communication device for supporting multiple service and its method |
| WO2008021372A2 (en) * | 2006-08-11 | 2008-02-21 | Slt Logic Llc | Enhanced ethernet protocol for shortened data frames within a constrained neighborhood based on unique id |
| CN101198190A (en) * | 2008-01-03 | 2008-06-11 | 中兴通讯股份有限公司 | Calibration method for Gigabit passive optical network packaging mode frame user data |
| CN101374035A (en) * | 2008-09-19 | 2009-02-25 | 中兴通讯股份有限公司 | Decoding method and system for GBIT passive optical network and framing method |
-
2009
- 2009-10-30 CN CN 200910207790 patent/CN102055727B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1859382A (en) * | 2005-12-16 | 2006-11-08 | 华为技术有限公司 | Communication device for supporting multiple service and its method |
| WO2008021372A2 (en) * | 2006-08-11 | 2008-02-21 | Slt Logic Llc | Enhanced ethernet protocol for shortened data frames within a constrained neighborhood based on unique id |
| CN101198190A (en) * | 2008-01-03 | 2008-06-11 | 中兴通讯股份有限公司 | Calibration method for Gigabit passive optical network packaging mode frame user data |
| CN101374035A (en) * | 2008-09-19 | 2009-02-25 | 中兴通讯股份有限公司 | Decoding method and system for GBIT passive optical network and framing method |
Non-Patent Citations (5)
| Title |
|---|
| 《GPON终端TC成帧子层关键技术研究》;党鑫;《中国优秀硕士学位论文全文数据库 信息科技辑 》;20100115(第1期);全文 * |
| 《吉比特无源光网络GTC层关键技术研究》;王鹏驰;《中国优秀硕士学位论文全文数据库 信息科技辑》;20080915(第9期);全文 * |
| 党鑫.《GPON终端TC成帧子层关键技术研究》.《中国优秀硕士学位论文全文数据库 信息科技辑 》.2010,(第1期), |
| 卞英音.《吉比特无源光网络（GPON）终端高层业务的研究与实现》.《中国优秀硕士学位论文全文数据库 信息科技辑》.2009,(第1期), * |
| 王鹏驰.《吉比特无源光网络GTC层关键技术研究》.《中国优秀硕士学位论文全文数据库 信息科技辑》.2008,(第9期), |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102055727A (en) | 2011-05-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101662417B (en) | Method and equipment for multi-service adapting and multi-service loading | |
| CN102055727B (en) | Data encapsulation method, encapsulation equipment and branch unit in multi-service transport network | |
| CN101729371B (en) | Method for service transmission and device for service transmission | |
| US11082199B2 (en) | Data transmission method in optical network and optical network device | |
| CN101378388B (en) | Method, system and equipment for transmitting passive optical network data | |
| CN1748381B (en) | Efficient framing procedure for variable length packets | |
| CN102056031B (en) | Method and device for transmitting multi-channel service | |
| US20030137975A1 (en) | Ethernet passive optical network with framing structure for native Ethernet traffic and time division multiplexed traffic having original timing | |
| US6847644B1 (en) | Hybrid data transport scheme over optical networks | |
| CN101815229A (en) | Method and device for service adaptation | |
| US6771663B1 (en) | Hybrid data transport scheme over optical networks | |
| CN112672236B (en) | Service signal processing method and equipment | |
| US20110318001A1 (en) | Method and device for sending and receiving service data | |
| US6778561B1 (en) | Hybrid data transport scheme over optical networks | |
| CN101453671A (en) | Method, system and equipment for passive optical network data transmission | |
| US6973084B1 (en) | Hybrid data transport scheme over optical networks | |
| CN101668003B (en) | Method, device and system for transmitting data frames | |
| CN101489154B (en) | Method, system and device for passive optical network connection processing | |
| CN102804651B (en) | Connected by pseudo-line during network interruption and keep time division multiplexing | |
| US20040114640A1 (en) | System, method and device for aggregating SONET links | |
| CN101582814A (en) | EOS tester of integrated LCAS simulation and VCG time delay simulation | |
| CN100370778C (en) | Resilient packet ring business transport method | |
| Guild | Next Generation Synchronous Digital Hierarchy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |