CN102055727A - 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 PDF

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Publication number
CN102055727A
CN102055727A CN200910207790XA CN200910207790A CN102055727A CN 102055727 A CN102055727 A CN 102055727A CN 200910207790X A CN200910207790X A CN 200910207790XA CN 200910207790 A CN200910207790 A CN 200910207790A CN 102055727 A CN102055727 A CN 102055727A
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frame head
layer frame
channel layer
adaptation layer
xor operation
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CN102055727B (en
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蒋红丽
胡幸
马腾
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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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

Data encapsulation method in the multi-service transmitting network, sealed in unit and tributary unit
Technical field
The embodiment of the 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) professional and the unified of several data business carries, 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 (Gigabit Passive 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 Transfer Mode; Hereinafter to be referred as: ATM) outside the cell, also carry GPON packing forms (GPON Encapsulation Method; Hereinafter to be referred as: GEM) frame, GEM is not only an adapting protocol, and a kind of especially link layer protocol with exchange capacity both had been suitable for the encapsulation of business datums such as Ethernet, also being suitable for the encapsulation of business datums such as TDM, is that integrated service inserts one of more satisfactory scheme.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art: 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 at this situation.
Summary of the invention
The embodiment of the 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 invention provides the data encapsulation method in a kind of multi-service transmitting network, comprising:
According to the frame head check byte of 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;
The described adaptation layer frame head and first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains behind the xor operation and the payload of adaptation layer frame be encapsulated in the payload of channel layer frame, the payload of described adaptation layer frame carries the business datum in the described multi-service transmitting network;
According to the frame head check byte of second frame head checking algorithm generation channel layer frame head, described frame head check byte is inserted the frame head check field of described channel layer frame head;
The described channel layer frame head and second bit pattern are carried out xor operation, and the channel layer frame head that obtains behind the xor operation and the payload of described channel layer frame are encapsulated as the channel layer frame.
The embodiment of the 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 the 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 the channel layer frame encapsulation process 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 the described channel layer frame encapsulation process is identical;
The adaptation layer data flow is extracted in position according to 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 the adaptation layer frame encapsulation process adaptation layer frame head being carried out xor operation is identical;
Carry out verification by the adaptation layer frame data stream that the 4th frame head checking algorithm obtains after to xor operation, 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 the 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 payload of described adaptation layer frame carries the business datum in the described multi-service transmitting network.
The embodiment of the 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 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 the described adaptation layer frame head and first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains behind the xor operation and the payload of adaptation layer frame be encapsulated in the payload of channel layer frame, the payload of described adaptation layer frame carries the business datum in the described multi-service transmitting network;
The second frame head check byte generation module is used for generating according to the second frame head checking algorithm 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 the described channel layer frame head and second bit pattern are carried out xor operation, and the channel layer frame head that obtains behind the xor operation and the payload of described channel layer frame are encapsulated as the channel layer frame.
The embodiment of the 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 the 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 the channel layer frame encapsulation process 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 the described 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 the 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 the adaptation layer frame encapsulation process adaptation layer frame head being carried out xor operation is identical;
Adaptation layer frame search module, be used for carrying out verification by the adaptation layer frame data stream that the 4th frame head checking algorithm obtains after to the described second data flow xor operation module xor operation, 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 the described adaptation layer frame encapsulation process is identical;
Adaptation layer frame decapsulation module, the payload of described adaptation layer frame head and adaptation layer frame is extracted in the position that is used for the adaptation layer frame head determined according to described adaptation layer frame search module, and the payload of described adaptation layer frame carries the business datum in the described multi-service transmitting network.
The embodiment of the invention also provides a kind of tributary unit, comprising:
Sealed in unit is used for the frame head check byte according to 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; The described adaptation layer frame head and first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains behind the xor operation and the payload of adaptation layer frame be encapsulated in the payload of channel layer frame, the payload of described adaptation layer frame carries the business datum in the described multi-service transmitting network; According to the frame head check byte of second frame head checking algorithm generation channel layer frame head, described frame head check byte is inserted the frame head check field of described channel layer frame head; The described channel layer frame head and second bit pattern are carried out xor operation, and the channel layer frame head that obtains behind the 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 the 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 the channel layer frame encapsulation process 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 the described channel layer frame encapsulation process is identical; The adaptation layer data flow is extracted in position according to 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 the adaptation layer frame encapsulation process adaptation layer frame head being carried out xor operation is identical; Carry out verification by the adaptation layer frame data stream that the 4th frame head checking algorithm obtains after to xor operation, 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 the described adaptation layer frame encapsulation process is identical; And extract the payload of described adaptation layer frame head and adaptation layer frame according to the position of described adaptation layer frame head.
By the embodiment of the 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; Decapsulation equipment is determined the position of adaptation layer frame head and channel layer frame head, the accurate location of having realized channel layer frame and adaptation layer frame by the frame head checking algorithm then.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
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 the 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 a channel layer frame structure of the present invention and an embodiment of adaptation layer frame structure;
Fig. 5 is mapped to enhancement mode GEM (Enhanced GEM for TDM business of the present invention; Hereinafter to be referred as: the EGEM) schematic diagram of an embodiment of frame;
Fig. 6 is mapped to the schematic diagram of an embodiment of EGEM frame for Ethernet service of the present invention;
Fig. 7 is the schematic diagram of GPON signal map of the present invention to 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 the multi-service transmitting network of the present invention;
Figure 10 is the flow chart of another embodiment of data encapsulation method in the multi-service transmitting network of the present invention;
Figure 11 is the flow chart of the embodiment of data de-encapsulation method in the multi-service transmitting network of the present invention;
Figure 12 is the flow chart of another embodiment of data de-encapsulation method in the multi-service transmitting network of the present invention;
Figure 13 searches the schematic diagram of an embodiment of frame state machine for the present invention;
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 invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained 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 the 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 the network rings can directly transmit 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 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 and has the business that the bandwidth time-delay guarantees, 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 guarantees business, promptly 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 business such as special line; (3) guarantee business as possible, (Best Effort promptly does one's best; Hereinafter to be referred as: BE) class business, for example: 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 the multi-service transmitting network are encapsulated and decapsulation according to unified EGEM frame format, and requirement is the unique sign of the professional appointment of each bar 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 frames, adds path overhead, constitutes 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 (Transmission Convergence; Hereinafter to be referred as TC) frame, add physical layer overhead, comprise frame head synchronously, administration overhead and bandwidth map etc., constitute physical layer, main frame is to the communication and the management of each node in the network to make things convenient for, and 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 detection, add up and report dynamic bandwidth request (the Dynamic Bandwidth Requirement of inner each service port of this node; Hereinafter to be referred as: DBR), report main frame, main frame is gone up existing bandwidth resources, each node traffic type and priority etc. according to ring, judges and calculates, 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 mainly is bandwidth map (Bandwidth Map; Hereinafter to be referred as: BWmap), receive after the bandwidth map, each node is according to the size and the quantity 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 to divide into groups to transmit transmission multiprotocol label switching (the Transport Multi-protocol Label Switching of mainstream technology now; Hereinafter to be referred as: T-MPLS) service port and provider backbone bridging traffic engineering (Provider Backbone Bridge-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 among the GPON also can be used as the service port of the network architecture shown in Figure 1.
Fig. 3 is the structural representation of an embodiment of the intersection equipment of the TCONT in the 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 to line unit 32 be used to carry out physical layer frame synchronously, the insertion and the extraction of expense; TCONT cross unit 33 is used for the TCONT passage of this website is increased (add) or reduces (drop), and break-through of the TCONT passage of non-website (TCONT place time slot is constant) or exchange (variation of TCONT place time slot); Tributary unit 34 be used for TCONT frame to this website carry out adaptive/separate adapting operation, and the EGEM frame carried out adaptive/separate adapting operation; Alternatively, tributary unit 34 can also be finished EGEM exchange, service bandwidth demand statistics and report, and function such as Business Processing.
, can extract by behind the TCONT cross unit 33 from the TCONT packet of east orientation line unit 31, also can send from the west to line unit 32 from tributary unit 34; Increase by TCONT cross unit 33 from the TCONT packet of tributary unit 34, send from east orientation line unit 31 to the TCONT of line unit 32 packet westerly with coming.
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 institute's distributed time slot, 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 is arranged all, 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), regularly read TCONT packet in this frame buffer according to the west to the frame synchronization of line unit 32 then, 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.
Write clock faster than readout clock when east orientation line unit 31, when phase accumulation arrives certain position, automatically reduce by a TCONT idle packet in the new framing, that is to say, former TCONT idle packet position is used to load the TCONT packet, be equivalent to transmit payload common in the net and slow down, then fill in a TCONT idle packet on the contrary, thereby realization east orientation line unit 31 is adjusted functions to the TCONT of line unit 32 because of the different needed speed of line speed with the west.When business datum is encapsulated as EGEM when bag at tributary unit 34, the idle packet of EGEM parlor also can be used for adjusting the difference between service rate and the TCONT payload area rate, 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 be to adopt the mode of just filling in, as long as the time slot of TCONT that DBA distributes to is bigger slightly 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 asynchronous working, as long as east orientation line unit 31 and the west frequency difference between line unit 32 is no more than the scope that can adjust to the line clock of line unit 32.The position with respect to frame synchronous byte in the physical layer frame structure of line unit 32 is constant to these TCONT time slots at east orientation line unit 31 and west under the asynchronous working situation, change be east orientation line unit 31 and western in line unit 32 frequency difference of identical time slot, and TCONT packet and TCONT idle packet are also floated in institute's distributed time slot.But since the capacity of institute's distributed time slot all the flow than the TCONT packet of required transmission is big, occur 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 distributed, this is suitable for having only 1 TCONT packet in the TCONT passage, and the situation of the fixed-site of TCONT packet in the TCONT passage, for example: the starting position of TCONT time slot is the situation of the original position of TCONT packet.And being 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 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 to realize accurate placed channel layer frame according to the frame head checking algorithm.In a kind of implementation of the embodiment of the 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 invention, the channel layer frame head adopts different frame head checking algorithms with the adaptation layer frame head.
Fig. 4 is the schematic diagram of a 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.
Below TCONT frame structure shown in Figure 4 and EGEM frame structure are described in detail.
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 a byte, the maximum length of payload data is 4095 bytes, if user data greater than this maximum length, then 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 4096 unique service identifications at most; Payload type indication (Payload Type Indicator; 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 control (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
B, on the basis of the GEM of GPON frame, the EGEM frame has increased purpose sign (Destination Node 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 (Tributary Interface Identifier; Hereinafter to be referred as: TI-ID), 10 bits.Wherein, Node-ID shows can comprise 64 nodes at most in the 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 bar business in can unique by different level specified network, for example: TI-ID can correspond to tributary card or the port in the 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 earlier according to different veneer distribution T I-ID, be the different Port-ID of a plurality of E1 interface assignment in the plate again, also can directly all E1 interface assignment TI-ID to intra-node, obviously, preceding a kind of method can obtain bigger sign scope; For Ethernet service, TI-ID can be physical port, and Port-ID corresponds to VLAN (Virtual Local Area Network; Hereinafter to be referred as: VLAN) sign etc.Below only be several examples of the method for identification service, the embodiment of the invention is not limited thereto, and the method for any correctly identification service all should fall into the protection range of the embodiment of the 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 professional speed poor of speed and EGEM frame of TDM itself, in the every increase of metadata cache or when reducing by 1 byte, adaptively, the value of a PLI of adjustment 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 the ethernet frame, other field of ethernet frame all is a regular length, thereby can determine the value of PLI, then, with destination address field (DAF), source address field, length/type field, medium 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 mapped to the schematic diagram of an embodiment of EGEM frame for Ethernet service of the present invention.When the length of ethernet frame during, need to use a plurality of continuous EGEM frames come burst to transmit this ethernet frame greater than 4095 bytes.(3) because the EGEM frame is improved on the basis of GEM frame, so the EGEM frame can dock with the GPON signal well, and only need install to the GEM frame with GPON signal deblocking and get 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 taken place in the implication of Port-ID, therefore need be Port-ID assignment again, correspondingly, also need to recomputate the HEC check value, PLI in the GEM frame and the value of PTI, and payload data, can directly copy in the corresponding territory of EGEM frame, as shown in Figure 7, Fig. 7 is the schematic diagram of GPON signal map of the present invention to 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.Because the bandwidth of TCONT channel transfer data allows to reach 2.5G, 10G even bigger bandwidth range, the payload length of TCONT frame will reach 38880 bytes, 155520 bytes or bigger 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 at an intranodal to form 1024 TCONT frames at most.Simple BIP-8 verification is adopted in the BIP verification.Monitoring byte M1 includes 4 bit FEE far end errors 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 that TCONT frame in the embodiment of the invention and the TCONT frame among the 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 Network Unit; Hereinafter to be referred as: the up direction multiple spot ONU) is suitable for to the scope of a bit.TCONT among the GPON; it mainly is realization for the different service types qos requirement; the administration overhead of TCONT is except up direction signalling path, up direction power level sequence and the report of up dynamic bandwidth among the GPON; do not define other administration overhead; as data verification, performance and alarm monitoring etc., thus among the GPON 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 among the GPON, inherited the structure of a plurality of EGEM frame of payload section framing, and kept the dynamic bandwidth function of reporting, can when changing, loaded service type bandwidth initiate the Dynamic Bandwidth Allocation request.Aspect OAM, the TCONT frame of the embodiment of the 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 invention has possessed more perfect OAM(Operation Administration Maintenance), in this TCONT frame institute distributed time slot, can play an effect that really independently transmits passage.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 invention can be that unit changes by 1 byte, and bandwidth availability ratio is very high, and faying face is to the DBA of the whole network mechanism, realize that the dynamic bandwidth adjustment is also very convenient, be particularly suitable for Web TV (Internet Protocol Television; Hereinafter to be referred as: IPTV), bandwidth on-demand (Bandwidth On Demand; Hereinafter to be referred as: BOD) wait business.
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 with frame structure shown in Figure 4 is, in the 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 the method for packing and the de-encapsulation method of specific embodiment above-mentioned channel layer frame and adaptation layer frame.
Fig. 9 is the flow chart of the embodiment of data encapsulation method in the 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 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 first bit pattern, and the adaptation layer frame head that obtains behind the 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 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 the channel layer frame head and second bit pattern, and the channel layer frame head that obtains behind the xor operation and the payload of channel layer frame are encapsulated as the channel layer frame.
In the present embodiment, the above-mentioned first frame head checking algorithm can be identical frame head checking algorithm with the second 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, first bit pattern was different bit patterns with second bit pattern; When the first frame head checking algorithm and the second frame head checking algorithm were different frame head checking algorithm, first bit pattern and second bit pattern can be identical or different bit pattern.
In the foregoing description, sealed in unit carries out xor operation with adaptation layer frame head and channel layer frame head and bit pattern, and then adaptation layer frame head behind the xor operation and channel layer frame head be encapsulated in adaptation layer frame and the 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 the 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 is identical frame head checking algorithm with the second frame head checking algorithm, be that the EGEM frame head adopts identical frame head checking algorithm with the TCONT frame head, present embodiment is header error control (Header Error Control with the first frame head checking algorithm and the second frame head checking algorithm; Hereinafter to be referred as: HEC) algorithm is that example describes.
As shown in figure 10, this embodiment comprises:
Step 1001 is according to length, destination interface and the type generation EGEM frame head expense and the EGEM frame overhead of the business datum in the multi-service transmitting network; The value of the frame head check field of EGEM frame head is made as 0, and the business datum in the above-mentioned multi-service transmitting network is placed in the payload of EGEM frame; It is the business datum in the payload carrying multi-service transmitting network of EGEM frame.
In the present embodiment, the frame head check field of EGEM frame head is the HEC field.
Step 1002 generates the frame head check byte of EGEM frame head according to the HEC algorithm, and this frame head check byte is inserted the HEC field of EGEM frame head.
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 a parity check bit, this make in the EGEM frame head of 40 bits promising " 1 " the position add up to even number.
Step 1003 is carried out xor operation with the EGEM frame head and first bit pattern, and with the EGEM frame head that obtains behind the xor operation and the payload of EGEM frame, promptly the EGEM frame is encapsulated in the payload of TCONT frame.
In the present embodiment, first bit pattern can be 0xB6AB31E055.Fit within the process of payload of TCONT frame at the EGEM frame,, can carry out rate adapted with EGEM free time (EGEM IDLE) frame when the bandwidth of EGEM frame during less than the bandwidth of the payload of TCONT frame; EGEM IDLE frame is the sequences of all bits of frame head for " 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 the EGEM frame head and first bit pattern, wherein, first bit pattern must have enough " 0,1 " upset rates.Then, again the EGEM frame head that obtains behind the xor operation and the payload of EGEM frame are encapsulated in the payload of TCONT frame.
Step 1004 is according to payload length generation payload length indication (the Payload Length Indicator of TCONT frame; Hereinafter to be referred as: PLI); Bit interleaved parity (Bit Interleaved Parity according to decapsulation equipment TCONT frame; Hereinafter to be referred as: BIP) check results and dynamic bandwidth request (Dynamic Bandwidth Request; Hereinafter to be referred as: DBR) report timer to generate TCONT frame head expense M1; Allocation identification (Allocation Identifier with TCONT; Hereinafter to be referred as: AllocID), DBR and BIP be inserted in the TCONT frame overhead; The value of the frame head check field of TCONT frame is made as 0.
In the present embodiment, the frame head check field of TCONT frame is the HEC field.
Step 1005 according to the frame head check byte of HEC algorithm generation TCONT frame head, is inserted this frame head check byte the HEC field of above-mentioned TCONT frame head.
Step 1006 is carried out xor operation with the TCONT frame head and second bit pattern, and the TCONT frame head that obtains behind the xor operation and the payload of TCONT frame are encapsulated as the TCONT frame.
In the present embodiment, 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 TCONT IDLE frame have enough " 0; 1 " the upset rate is so that decapsulation equipment location TCONT frame; sealed in unit can carry out xor operation with the TCONT frame head and second bit pattern usually; wherein; second bit pattern must have enough " 0; 1 " the upset rate, and then the TCONT frame head that obtains behind the xor operation and the payload of TCONT frame be encapsulated as the TCONT frame.
In the present embodiment, the first frame head checking algorithm is identical frame head checking algorithm with the second frame head checking algorithm, the first frame head checking algorithm also can be different frame head checking algorithms with the second frame head checking algorithm, for example: the first frame head checking algorithm can be the HEC algorithm, and the second frame head checking algorithm can be core header error control (core Header Error Control; Hereinafter to be referred as: cHEC) algorithm, promptly 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 not 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, first bit pattern can be 0xB6AB31E0; In step 1006, second bit pattern can be 0xB6AB31E055.Though preceding 4 bytes of second bit pattern are the same with first bit pattern, but because the TCONT frame head is different with the frame head checking algorithm that the EGEM frame head adopts, because the generator polynomial difference of different frame head checking algorithms, so decapsulation equipment can be distinguished TCONT frame head and EGEM frame head.
In the foregoing description, sealed in unit carries out xor operation with EGEM frame head and TCONT frame head and bit pattern, and then EGEM frame head behind the xor operation and TCONT frame head be encapsulated in EGEM frame and the 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 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, can both realize the accurate location of TCONT frame and EGEM frame, and realize simple with different bit pattern.
Figure 11 is the flow chart of the embodiment of data de-encapsulation method in the multi-service transmitting network of the present invention, and as shown in figure 11, this embodiment comprises:
Step 1101, 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 the channel layer frame encapsulation process channel layer frame head being carried out xor operation is identical.
Step 1102, the 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 the channel layer frame encapsulation process is identical.
Step 1103, the adaptation layer data flow is extracted in position according to the channel layer frame head, this adaptation layer data flow and the 4th bit pattern are carried out xor operation, and wherein, the bit pattern that adopts when in the 4th bit pattern and the adaptation layer frame encapsulation process adaptation layer frame head being carried out xor operation is identical.
Step 1104 is carried out verification by the adaptation layer frame data stream that the 4th frame head checking algorithm obtains after to xor operation, determines the position of described adaptation layer frame head, and the frame head checking algorithm that adopts in the 4th frame head checking algorithm and the adaptation layer frame encapsulation process is identical.
Step 1105 is according to the position extraction adaptation layer frame head of adaptation layer frame head and the payload of adaptation layer frame; Wherein, the business datum in the payload of this adaptation layer frame carrying multi-service transmitting network.
In the present embodiment, the 3rd frame head checking algorithm can be identical frame head checking algorithm with the 4th 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 was different bit patterns with the 4th bit pattern; 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 the foregoing description, 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 the encapsulation process is identical; And then determine the position of frame head, thereby accurately placed channel layer frame and adaptation layer frame by the frame head checking algorithm.
Figure 12 is the flow chart of another embodiment of data de-encapsulation method in the multi-service transmitting network of the present invention, and among 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 is identical frame head checking algorithm with the 4th frame head checking algorithm, and it is that example describes that present embodiment is the HEC algorithm with the 3rd frame head checking algorithm and the 4th frame head checking algorithm.
As shown in figure 12, this embodiment comprises:
Step 1201, according to bandwidth map location TCONT time slot, data flow in this TCONT time slot and the 3rd bit pattern are carried out xor operation, and the bit pattern that adopts when in the 3rd bit pattern and the TCONT frame encapsulation process TCONT frame head being carried out xor operation is identical.
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.
Step 1202, the data flow in the TCONT time slot that obtains after to xor operation by the 3rd frame head checking algorithm is carried out verification, determines the position of TCONT frame head, and the frame head checking algorithm that adopts in the 3rd frame head checking algorithm and the TCONT frame encapsulation process is identical.
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 searches the schematic diagram of an embodiment of frame state machine for the present invention.Searching under the 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, then 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 then sliding is carried out the HEC verification to 5 continuous thereafter bytes again.Under presynchronization state, can search 5 bytes of carrying out HEC verification next time according to the PLI in the TCONT frame head that searches; If HEC verification next time is correct, then 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.
Step 1203, the EGEM data flow is extracted in position according to the TCONT frame head, this EGEM data flow and the 4th bit pattern are carried out xor operation, and wherein, the bit pattern that adopts when in the 4th bit pattern and the EGEM frame encapsulation process EGEM frame head being carried out xor operation is identical.
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, elder generation's buffer memory step 1202 is searched in the frame process data flow of TCONT time slot under the presynchronization state, enters after the synchronous regime position of the TCONT frame head of determining according to step 1202 again, and the data flow under the presynchronization state is carried out the TCONT decapsulation; Particularly, can extract the 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.
Step 1204 is carried out verification by the EGEM data flow that the 4th frame head checking algorithm obtains after to xor operation, determines the position of EGEM frame head, and the frame head checking algorithm that adopts in the 4th frame head checking algorithm and the EGEM frame encapsulation process is identical.
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, carry out verification, determine that the method for position of EGEM frame head is identical with the method that step 1202 provides, do not repeat them here by the EGEM data flow that the HEC algorithm obtains after to xor operation.
Step 1205 is according to the position extraction EGEM frame head of EGEM frame head and the payload of EGEM frame.
Particularly, when extracting the payload of EGEM frame head and EGEM frame, can first buffer memory step 1204 search the EGEM data flow under the presynchronization state in the frame process, enter after the synchronous regime again the position of the EGEM frame head of determining according to step 1204, extract the EGEM frame head in the EGEM data flow and the payload of EGEM frame.
The foregoing description is that data de-encapsulation method in the HEC algorithm multi-service transmitting network that to be example provide the embodiment of the invention is introduced with the 3rd frame head checking algorithm and the 4th frame head checking algorithm, 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 the foregoing description, 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 the encapsulation process is identical; And then determine the position of frame head, thereby accurately placed channel layer frame and adaptation layer frame by the frame head checking algorithm; Data de-encapsulation method in the multi-service transmitting network that 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 have only in 1 TCONT time slot the situation of the fixed-site 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 finished by the relevant hardware of program command, aforesaid program can be stored in the 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: 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 be provided with separately, also can be used as the part of tributary unit, realizes the present invention's flow process 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 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 the adaptation layer frame head and first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains behind the 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 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 the channel layer frame head and second bit pattern are carried out xor operation, and the channel layer frame head that obtains behind the 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, first bit pattern that adaptation layer frame head xor operation module 1402 adopts was different bit patterns with second bit pattern that channel layer frame head xor operation module 1404 adopts; 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, second bit pattern that 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 the foregoing description, 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 behind the 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 behind the 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 be provided with separately, also can be used as the part of tributary unit, realizes the present invention's flow process 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, the length, destination interface and the type that are used for according to the business datum of multi-service transmitting network generate the expense of adaptation layer frame head and the expense of adaptation layer frame, 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 the 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 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 the adaptation layer frame head and first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains behind the 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 to generate 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 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 the channel layer frame head and second bit pattern are carried out xor operation, and the channel layer frame head that obtains behind the 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, first bit pattern that adaptation layer frame head xor operation module 1503 adopts was different bit patterns with second bit pattern that channel layer frame head xor operation module 1506 adopts; 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, second bit pattern that 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 the foregoing description, 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 behind the 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 behind the 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 be provided with 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 the channel layer frame encapsulation process 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 the 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 determined 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 the adaptation layer frame encapsulation process adaptation layer frame head being carried out xor operation is identical;
Adaptation layer frame search module 1605, be used for carrying out verification by the adaptation layer frame data stream that the 4th frame head checking algorithm obtains after to the second data flow xor operation module, 1604 xor operations, determine the position of adaptation layer frame head, the frame head checking algorithm that adopts in the 4th frame head checking algorithm and the 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 determined 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 3rd bit pattern that the first data flow xor operation module 1601 adopts was different bit patterns with the 4th bit pattern that the second data flow xor operation module 1604 adopts; 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 the foregoing description, the first data flow xor operation module 1601 and the second data flow xor operation module 1604 utilize bit pattern that the data flow that receives is carried out xor operation, and the bit pattern that adopts in this bit pattern and the encapsulation process is identical; 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 then, 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 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 first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains behind the 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; According to the frame head check byte of second frame head checking algorithm generation channel layer frame head, above-mentioned frame head check byte is inserted the frame head check field of channel layer frame head; The channel layer frame head and second bit pattern are carried out xor operation, and the channel layer frame head that obtains behind the 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 the channel layer frame encapsulation process 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 the 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 the adaptation layer frame encapsulation process adaptation layer frame head being carried out xor operation is identical; Carry out verification by the adaptation layer frame data stream that the 4th frame head checking algorithm obtains after to xor operation, determine the position of adaptation layer frame head, the frame head checking algorithm that adopts in the 4th frame head checking algorithm and the 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; Decapsulation equipment 1702 is determined the position of adaptation layer frame head and channel layer frame head, the accurate location of having realized channel layer frame and adaptation layer frame by the frame head checking algorithm then.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the 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 among the 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 present embodiment.The module of the foregoing description 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 made amendment to the technical scheme that aforementioned each embodiment put 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 (10)

1. the data encapsulation method in the multi-service transmitting network is characterized in that, comprising:
According to the frame head check byte of 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;
The described adaptation layer frame head and first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains behind the xor operation and the payload of adaptation layer frame be encapsulated in the payload of channel layer frame, the payload of described adaptation layer frame carries the business datum in the described multi-service transmitting network;
According to the frame head check byte of second frame head checking algorithm generation channel layer frame head, described frame head check byte is inserted the frame head check field of described channel layer frame head;
The described channel layer frame head and second bit pattern are carried out xor operation, and the channel layer frame head that obtains behind the xor operation and the payload of described channel layer frame are encapsulated as the channel layer frame.
2. method according to claim 1 is characterized in that, the described first frame head checking algorithm is identical frame head checking algorithm with the described second frame head checking algorithm, and described first bit pattern is different bit patterns with described second bit pattern; Perhaps,
The described first frame head checking algorithm is different frame head checking algorithms with the described second frame head checking algorithm, and described first bit pattern and described second bit pattern are identical or different bit pattern.
3. the data de-encapsulation method in the multi-service transmitting network is characterized in that, comprising:
According to bandwidth map placed channel layer frame slot, data flow in the 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 the channel layer frame encapsulation process 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 the described channel layer frame encapsulation process is identical;
The adaptation layer data flow is extracted in position according to 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 the adaptation layer frame encapsulation process adaptation layer frame head being carried out xor operation is identical;
Carry out verification by the adaptation layer frame data stream that the 4th frame head checking algorithm obtains after to xor operation, 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 the 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 payload of described adaptation layer frame carries the business datum in the described multi-service transmitting network.
4. method according to claim 3 is characterized in that, described the 3rd frame head checking algorithm is identical frame head checking algorithm with described the 4th frame head checking algorithm, and described the 3rd bit pattern is different bit patterns with described the 4th bit pattern; Perhaps,
Described the 3rd frame head checking algorithm is different frame head checking algorithms with described the 4th frame head checking algorithm, and described the 3rd bit pattern and described the 4th bit pattern are identical or different bit pattern.
5. 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 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 the described adaptation layer frame head and first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains behind the xor operation and the payload of adaptation layer frame be encapsulated in the payload of channel layer frame, the payload of described adaptation layer frame carries the business datum in the described multi-service transmitting network;
The second frame head check byte generation module is used for generating according to the second frame head checking algorithm 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 the described channel layer frame head and second bit pattern are carried out xor operation, and the channel layer frame head that obtains behind the xor operation and the payload of described channel layer frame are encapsulated as the channel layer frame.
6. sealed in unit according to claim 5 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 to generate the expense of described channel layer frame head and the expense of described channel layer frame.
7. sealed in unit according to claim 5, it is characterized in that, the first frame head checking algorithm that the described first frame head check byte generation module adopts is identical frame head checking algorithm with the second frame head checking algorithm that the described second frame head check byte generation module adopts, and first bit pattern that described adaptation layer frame head xor operation module adopts is different bit patterns with second bit pattern that described channel layer frame head xor operation module adopts; Perhaps,
The first frame head checking algorithm that the described first frame head check byte generation module adopts is different frame head checking algorithms with the second frame head checking algorithm that the described second frame head check byte generation module adopts, and second bit pattern that 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.
8. 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 the 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 the channel layer frame encapsulation process 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 the described 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 the 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 the adaptation layer frame encapsulation process adaptation layer frame head being carried out xor operation is identical;
Adaptation layer frame search module, be used for carrying out verification by the adaptation layer frame data stream that the 4th frame head checking algorithm obtains after to the described second data flow xor operation module xor operation, 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 the described adaptation layer frame encapsulation process is identical;
Adaptation layer frame decapsulation module, the payload of described adaptation layer frame head and adaptation layer frame is extracted in the position that is used for the adaptation layer frame head determined according to described adaptation layer frame search module, and the payload of described adaptation layer frame carries the business datum in the described multi-service transmitting network.
9. decapsulation equipment according to claim 8, it is characterized in that, the 3rd frame head checking algorithm that described channel layer frame search module adopts is identical frame head checking algorithm with the 4th frame head checking algorithm that described adaptation layer frame search module adopts, and the 3rd bit pattern that the described first data flow xor operation module adopts is different bit patterns with the 4th bit pattern that the described second data flow xor operation module adopts; Perhaps,
The 3rd frame head checking algorithm that described channel layer frame search module adopts is different frame head checking algorithms with the 4th frame head checking algorithm that described adaptation layer frame search module adopts, and the 4th bit pattern that the 3rd bit pattern that the described first data flow xor operation module adopts and the described second data flow xor operation module adopt is identical or different bit pattern.
10. a tributary unit is characterized in that, comprising:
Sealed in unit is used for the frame head check byte according to 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; The described adaptation layer frame head and first bit pattern are carried out xor operation, and the adaptation layer frame head that obtains behind the xor operation and the payload of adaptation layer frame be encapsulated in the payload of channel layer frame, the payload of described adaptation layer frame carries the business datum in the described multi-service transmitting network; According to the frame head check byte of second frame head checking algorithm generation channel layer frame head, described frame head check byte is inserted the frame head check field of described channel layer frame head; The described channel layer frame head and second bit pattern are carried out xor operation, and the channel layer frame head that obtains behind the 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 the 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 the channel layer frame encapsulation process 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 the described channel layer frame encapsulation process is identical; The adaptation layer data flow is extracted in position according to 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 the adaptation layer frame encapsulation process adaptation layer frame head being carried out xor operation is identical; Carry out verification by the adaptation layer frame data stream that the 4th frame head checking algorithm obtains after to xor operation, 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 the described adaptation layer frame encapsulation process is identical; And extract the payload of described adaptation layer frame head and adaptation layer frame according to the position of described adaptation layer frame head.
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