CN105307060A - Data transmission and holding method for heterogeneous network - Google Patents

Data transmission and holding method for heterogeneous network Download PDF

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Publication number
CN105307060A
CN105307060A CN201510650307.0A CN201510650307A CN105307060A CN 105307060 A CN105307060 A CN 105307060A CN 201510650307 A CN201510650307 A CN 201510650307A CN 105307060 A CN105307060 A CN 105307060A
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data
frame
epon
network
priority
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CN201510650307.0A
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CN105307060B (en
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陈卫
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东莞理工学院
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Abstract

The invention discloses a data transmission and holding method for a heterogeneous network, which is used for converging and accessing sensor networks. The data transmission is divided into uplink direction data transmission and downlink direction data transmission. During the uplink direction data transmission, an ONU optical network unit receives uplink data of the sensor networks, packages a data frame in a net charge part of an EPON data frame structure, dispatches a QoS processing strategy, sets different priority levels for different sensor networks and respectively sends the priority levels to corresponding priority level queues, and data stream with a higher priority level is sent preferably. During the downlink direction data transmission, an EPON data frame is transmitted to the ONU optical network unit to be decapsulated and processed and is sent to a sensor network coordinator. The method is used for converging and accessing multiple sensor networks to a core network through EPON to achieve integrated management and centralized dispatch of the multiple sensor networks, so as to collect, analyze and process big data from the multiple sensor networks more conveniently.

Description

A kind of transfer of data of heterogeneous network and keeping method

Technical field

The present invention relates to the technical field of communication data transfer, particularly a kind of transfer of data of heterogeneous network and keeping method.

Background technology

Sensor network range of application is more and more wider, and quantity gets more and more.At present, sensor network normally accesses personal computer or local area network (LAN), and such access way is not easy to monitor multiple sensor network, and the mass data be not easy to gathering comprehensively is analyzed.

Sensor network transmits data by wireless communication link, and the physical layer reliability of wireless communication link is lower, has higher error probability.The physical layer stable performance of wired communications links, communication quality is higher, and carrier-class QoS (QualityofService, service quality) can be provided to ensure.

By forming amalgamation heterogeneous network to wired communications links system extension wireless traffic interface, can the wired and wireless traffic of centralized control, unifiedly realize multi-service telemanagement, maintenance and service dispense etc.This system makes full use of the reliability of wire communication, is convenient to the access that operator realizes multiple business.How the access of such heterogeneous physical links realizes being the important technological problems that the present invention will solve.

Summary of the invention

The object of the invention is to overcome the shortcoming of prior art and deficiency, a kind of transfer of data and keeping method of heterogeneous network are provided, to the method achieve multiple sensor network on the basis of existing EPON system by EPON (EthernetPassiveOpticalNetwork, ether passive optical-fiber network) converge core network access, so as to realize the integrated management of multiple sensor network, comprehensive to analyze, centralized dispatching, be more convenient for gathering, analyze, process large data from multiple sensor network.

Object of the present invention is achieved through the following technical solutions:

The transfer of data of heterogeneous network and a keeping method, comprise the following steps:

S1, up direction transfer of data, the upstream data of ONU optical network unit receiving sensor network coordinator, the Frame of described upstream data is encapsulated in the payload part of EPON data frame structure, call QoS processing policy, to different sensor networks, artificial correspondence arranges different priority, by in the header field of the field write ethernet frame of reflection priority, deliver to corresponding priority query respectively, if the sending time slots of described ONU optical network unit arrives, then ONU optical network unit sends the data of each priority query, the data flow that level of priority is high first sends, by ODN Optical Distribution Network by EPON data frame transfer to OLT optical line terminal, be then sent to the interface of the sensor network data processing center in core net,

S2, down direction transfer of data, OLT optical line terminal receives the downlink data of the sensor network data processing center in core net, by ODN Optical Distribution Network by EPON data frame transfer to ONU optical network unit, and in described ONU optical network unit, after decapsulation, revert to the heterogeneous data frame of coincidence senser network coordinator cable business interface format, be then sent to described sensor network telegon and send.

Preferably, described step S1 is specially:

The upstream data of S11, described ONU optical network unit receiving sensor network coordinator;

S12, complete the configuration of described ONU optical network unit up-downgoing controller, realize the control of up-downgoing data channel;

S13, the described upstream data received carried out to classification and extract, extract data length, text and check code, then distribute different memory spaces to store, described memory space comprises text area, length field, check code district, respectively length count check and CRC inspection are carried out to described upstream data, if count value equals above-mentioned data length and CRC check is correct, then the text of storage and length are skipped to next step as up ethernet frame payload data, will be dropped if count incorrect or that CRC check is wrong Frame;

S14, described up ethernet frame payload data is assembled into EPON Frame;

S15, described ethernet frame carried out priority and arrange and send into corresponding priority query respectively and carry out buffer memory afterwards, according to described QoS processing policy, export the EPON Frame of high priority, realize the scheduling of different priorities queue at many queues storage area;

S16, described OLT optical line terminal receive EPON Frame by described ODN Optical Distribution Network;

Up EPON Frame to be sent is sent to the interface of the sensor network data processing center in core net by S17, described OLT optical line terminal.

Preferably, described step S2 is specially:

S21, described OLT optical line terminal receive the downlink data of the sensor network data processing center in core net;

S22, described OLT optical line terminal send EPON Frame by described ODN Optical Distribution Network;

S23, described ONU optical network unit receive EPON Frame by described ODN Optical Distribution Network;

S24, described ONU optical network unit carry out CRC check to above-mentioned EPON Frame, the wrong EPON Frame of verification is abandoned, the errorless EPON Frame of verification is carried out address check, the EPON Frame that the MAC Address of described OLT optical line terminal or target MAC (Media Access Control) address be different from the MAC Address of described ONU optical network unit is different from for source MAC abandon, then length check is carried out to this EPON Frame, the EPON Frame not meeting length range is abandoned; According to Length Indication, revert to the heterogeneous data frame of coincidence senser network coordinator cable business interface format after taking out payload field frame number and corresponding length data, then send;

S25, described heterogeneous data frame to be stored, judged whether lost data frames simultaneously, if there is loss, reported, if do not have loss to skip to next step;

S26, complete the configuration of described ONU optical network unit up-downgoing controller, realize the control of up-downgoing data channel, and downlink data is sent to described sensor network telegon.

Preferably, described qos policy process comprises and arranges Priority flag and Priority Queuing table, according to user's needs, sensor network data corresponding for different ONU optical network unit can be arranged to different priorities mark, and respective priority thresholding in EPON frame head is set, during uplink frame classification buffer memory, Priority flag is read, form the Priority Queuing table that frame is corresponding with priority, control many queue buffer.

Preferably, the upstream data of the air interface of described sensor network telegon and downlink data are the zigbee signal meeting IEEE802.15.4 agreement.

The present invention has following advantage and effect relative to prior art:

1) adopt EPON to access in design of the present invention, the mass data that multiple sensor network gathers is converged in core net, be convenient to Realization analysis, monitoring, modeling, build the integrated applications such as storehouse.The present invention takes full advantage of the reliability of optical fiber communication, and merges sensor network in EPON system.

2) in design of the present invention, the basic function of the interface of PHY layer and MAC layer and the function of data communication can be tested by the packet loss and throughput etc. of test macro, the function of system QoS mechanism can be recorded by the time delay measuring Various types of data, the data of limit priority increase successively to the data delay of lowest priority, and shake increases successively.

3) when the present invention's design makes heterogeneous data transmit in heterogeneous network, QoS is protected, and realizes the transmission of the data flow of the different grade of service, and the qos parameter that heterogeneous data comprises simultaneously is kept in a stream.

Accompanying drawing explanation

Fig. 1 is the isomery UNE structure chart of the heterogeneous data access in the present invention based on EPON system;

Fig. 2 is ONU side heterogeneous data transport module practical function block diagram in the present invention;

Fig. 3 is the transfer of data of heterogeneous network in the present invention and the transmitting uplink data flow chart of keeping method;

Fig. 4 is the transfer of data of heterogeneous network in the present invention and the downlink data transmission flow chart of keeping method;

Fig. 5 is EPON ethernet frame structural representation in the present invention;

Fig. 6 is ONU side data converter function block diagram in the present invention;

Fig. 7 is the state machine diagram of ONU side uplink frame buffer in the present invention;

Fig. 8 is the state machine diagram of ONU side uplink frame wrapper in the present invention;

Fig. 9 is the state machine diagram of ONU side downlink frame resolver in the present invention;

Figure 10 is the state machine diagram of ONU side downlink frame buffer in the present invention;

Figure 11 is the state machine diagram of line control unit under ONU side in the present invention;

Figure 12 is the state machine diagram of ONU side upload control device in the present invention;

Figure 13 is the schematic diagram realizing DiffServ in IEEE802.3 frame;

Figure 14 is the Priority Queuing schematic diagram that in the present invention, in uplink frame queue device, many queue buffer supported data is distinguished;

Figure 15 is medium priority queue output state machine figure of the present invention.

Embodiment

For making object of the present invention, technical scheme and advantage clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.

One, SYSTEM SUMMARY

EPON, based on Optical Fiber Transmission, provides multiple network side and user side interface, adaptive multiple access technology and multiple applied environment.In order to increase the mobile model of network, in EPON system, increase wave point, form isomery UNE, the mass data of sensor network nodes collection is converged to core net by Optical Fiber Transmission by this isomery UNE.This network possesses multiple advantage, both provides large bandwidth, is applicable to big data quantity transmission, supports again mobile access, can use broadband services flexible and changeablely.

The upstream data of the air interface of sensor network telegon and downlink data are the ZigBee signal meeting IEEE802.15.4 agreement.

Wherein, ZigBee technology be a kind of closely, low complex degree, low-power consumption, low rate, low cost bidirectional wireless communication technology.Be mainly used in apart from short, low in energy consumption and carry out transfer of data between the digital transmission module that transmission rate is not high.A ZigBee system is by the wireless data sending network platform that can how to form to 65000 wireless data transmission modules.

In the present embodiment, the mass data of sensor network nodes collection is transferred to Zigbee telegon by Zigbee communication by isomery UNE, be transferred to ONU (OpticalNetworkUnit again, optical network unit), then by ODN (OpticalDistributionNetwork, Optical Distribution Network) Optical Fiber Transmission is to OLT (OpticalLineTerminal, optical line terminal) after converge to core net again, wherein ODN is the fiber cable network based on PON equipment.

Concrete structure composition as shown in Figure 1, Fig. 1 is the isomery UNE structure chart of the heterogeneous data access in the present embodiment based on EPON system, the present invention is the transfer of data supporting Zigbee communication on the basis of EPON system, to access to high efficient and reliable and to transmit EPON data flow and heterogeneous data stream in EPON system.The transfer of data of EPON system is the Ethernet protocol based on IEEE802.3 standard, adopts IP packet structure.

In the present embodiment, adopt EPON access, the mass data that multiple sensor network gathers is linked into core net.Different from the past sensor network is accessed personal computer or local area network (LAN), present invention achieves and multiple sensor network is converged core network access by EPON, so as to realize the integrated management of multiple sensor network, comprehensive to analyze, centralized dispatching, be more convenient for gathering, analyze, process large data from multiple sensor network.

In this heterogeneous network, data stream transmitting is based on the Frame of EPONEthernet frame format, the ZigBee sensor network meeting IEEE802.15.4 agreement is called foreign peoples's signal through the signal that ZigBee telegon accesses in EPON system, this foreign peoples's signal coincidence senser network coordinator cable business interface format.

Two, radio interface data streams processing procedure

As shown in Figure 2, in figure, solid box represents the function that ONU side heterogeneous data transport module realizes, simultaneously the transfer of data of heterogeneous network and the transmitting uplink data flow chart of keeping method and downlink data transmission flow chart in composition graphs 3 and Fig. 4 the present invention, known:

When the transfer of data of heterogeneous network disclosed in the present embodiment and keeping method are transmitting uplink data, the data of collection send in the mode of Zigbee wireless signal by sensor network nodes, the Zigbee telegon linked with ONU optical network unit is sent into through air interface, Zigbee telegon, by data receiver, sends into data converter through interface driver.Data converter realizes foreign peoples's signal frame to be encapsulated in payload part in ethernet frame, and then ONU optical network unit only sends data at its sending time slots.Data flow is transferred in OLT optical line terminal through ODN Optical Distribution Network, then passes to core network interface.Sensor network data processing center is routed to again by core net.

When the transfer of data of heterogeneous network disclosed in the present embodiment and keeping method are downlink data transmission, downstream data flow enters OLT optical line terminal from core net, and is sent to ONU optical network unit by OLT optical line terminal through ODN Optical Distribution Network.ONU optical network unit receives the packet in one's name time slot, and data converter, to this packet decapsulation, realizes being extracted from ethernet frame by foreign peoples's signal frame and doing respective handling.

In the design, heterogeneous data stream is supported to realize in the data converter of the respective design of QoS mechanism mainly in heterogeneous data transmission.

Three, data converter

For up-downgoing data, the Core Feature realized in data converter mainly comprises uplink frame buffer memory, uplink frame encapsulation, the parsing of downlink frame buffer memory, downlink frame, up-downgoing control, QoS process, uplink frame queue device etc., realizes the format conversion function and QoS process etc. of foreign peoples's signal frame to ethernet frame.

Wherein, uplink and downlink EPON ethernet frame structure as shown in Figure 5, comprises the destination address of leading, the 6byte of 8byte, the source address of 6byte, the length of 2byte or type-byte, the data of 46 ~ 1500byte and the FCS part of 4byte.

Fig. 6 is ONU side data converter function block diagram in the present embodiment, and be the function that ONU side data transducer realizes in solid box, dotted line frame is the interface driver and ONU mainboard that ONU side data transducer is adjacent.

Downlink frame resolver in ONU side data transducer is connected with ONU mainboard, and the data of descending ethernet frame format are sent to downlink frame resolver by ONU mainboard; Downlink frame resolver is connected with downlink frame buffer, and the ethernet frame format that downlink frame resolver removes data is then sent to downlink frame buffer, stores; Downlink frame buffer is connected with up-downgoing controller, up-downgoing controller according to interrupt requests by the transfer of data of downlink frame buffer to the downstream interface driver portion of interface driver.The upstream Interface driver of interface driver is also connected with the up-downgoing controller in ONU side data transducer, up-downgoing controller is also connected with uplink frame buffer, the transfer of data extremely up frame buffer that upstream Interface driver transmits according to interrupt requests by up-downgoing controller; Upstream data is stored at uplink frame buffer; Uplink frame buffer is connected with uplink frame wrapper, and upstream data is sent to uplink frame wrapper and is assembled into ethernet frame; Uplink frame wrapper is connected with uplink frame queue device, and upstream data arranges according to priority classification in uplink frame queue device; Uplink frame queue device is connected with ONU mainboard, is transferred to ONU mainboard according to the data of priority classification arrangement.Uplink frame buffer is connected with QoS processor with uplink frame queue device, and QoS processor, according to dscp field content and cpu instruction in every frame, determines the priority of every frame in uplink frame queue device.

In the upstream direction, ONU optical network unit receives user data, is ethernet frame format by foreign peoples's signal assemble, manually can also arrange priority simultaneously, the precedence field manually arranged is mapped in ethernet frame, delivers in uplink frame queue device and set up priority query.

In the downstream direction, to ethernet frame decapsulation in ONU optical network unit, revert to foreign peoples's signal frame form and be sent to the storage of downlink frame buffer.

The up-downgoing process of ONU optical network unit side, specifically comprises following content:

1, uplink frame buffer

First foreign peoples's signal data of ONU optical network unit receiving sensor network coordinator transmission, read data and classification is carried out to it and extract, extract data length, text and check code, then distribute different memory spaces: text area, length field, check code district.

To the foreign peoples's signal frame length counting also CRC check stored, when count value equals above-mentioned length value, illustrate that deposited text is complete; If CRC check is also correct, then the text of storage and length are given ethernet frame package module as up ethernet frame payload; If count value is incorrect or CRC check is wrong, then foreign peoples's signal frame will be dropped.The state machine of concrete uplink frame buffer is with reference to shown in Fig. 7.

2, uplink frame wrapper

Uplink frame wrapper realizes function no upstream payload data being assembled into ethernet frame.First uplink frame wrapper reads payload carry out data buffer storage, to foreign peoples's signal frame data cell counting number, if the data cell number of counting is greater than 1500, then arranges to abandon and indicates and abandon this ethernet frame payload; If the data cell number of counting is less than 46, then filling full 0 byte makes the data cell number counted equal 46, if or the data cell number of counting is not less than 46 and is not more than 1500, read Mac address, type etc., be combined into ethernet frame, this frame comprises lead code, target MAC (Media Access Control) address, source MAC, type, payload (uplink data units may need to fill) and FCS (CRC check result).Target MAC (Media Access Control) address is the MAC Address that corresponding OLT holds first line of a couplet equipment; Source MAC is the MAC Address of the telegon be connected with ONU end.The state machine of concrete uplink frame wrapper is with reference to shown in Fig. 8.

3, downlink frame resolver

First downlink frame resolver carries out CRC check to the downlink Ethernet frame received, and is abandoned by the wrong frame of verification, is extracted by frame errorless for verification.The ethernet frame that OLT holds MAC Address or target MAC (Media Access Control) address to be different from ONU end MAC Address is different from for source MAC will abandon.The off-limits ethernet frame of length, also will abandon.According to Length Indication, revert to foreign peoples's signal data frame after taking out payload field frame number and corresponding length data, then send.The state machine of concrete downlink frame resolver is with reference to shown in Fig. 9.

4, downlink frame buffer

Foreign peoples's signal data frame from downlink frame resolver is stored, has judged whether lost frames by counting simultaneously, if there is loss, reported, if do not lost, send.The state machine of concrete downlink frame buffer is with reference to shown in Figure 10.

5, up-downgoing controller

Up-downgoing controller major function has been the configuration of interface chip, realizes uplink and downlink Data Control.After the interrupt signal from interface being detected, read interrupt register value, transmit and control corresponding uplink and downlink data.The state machine of concrete lower line control unit and the state machine of upload control device are respectively with reference to shown in Figure 11,12.

6, QoS processor

According to user's needs, the different sub-network network data of sensor network can be arranged to different priorities, and respective priority thresholding in EPON frame head is set.Form the dispatch list that frame is corresponding with priority, control high-speed cache frame queue device.

QoS process comprises and arranges Priority flag, Priority Queuing table etc.Other strategy follows the original priority policy of EPON system.

6.1 arrange Priority flag

Adopt IEEE802.1DUserPriority, can select to support DSCP Priority flag.In the IEEE802.3 frame format of ethernet standard, dscp field is mapped to header field, thus realizes the quality assurance of DiffServ differential service, on link layer, namely realize QoS ensure, concrete with reference to shown in Figure 13.

Wherein, DSCP priority is made up of 6 in IP packet header, uses ToS byte, and therefore after use DSCP, this byte is also referred to as DSCP byte.Its position in byte is as follows:

DS5DS4DS3DS2DS1DS0CUCU

Wherein: DSCP priority: 6bit (DS5-DS0), wherein, 0 is minimum, and 63 is the highest.

Do not use (CU): 2bit.

The data flow that different node transmits can be corresponding different the grade of service, its Priority flag relative set different value, such qos parameter is kept in a stream simultaneously.

6.2 Priority Queuing tables

Each in priority query stored in a frame, Priority Queuing table just stays next record, the frame length of this frame corresponding and priority thereof.Uplink frame is successively stored in queue, and corresponding information is also successively stored in Priority Queuing table.Often from priority query, export a frame, queue table just deletes a record automatically.

7, uplink frame queue device

As shown in the Priority Queuing schematic diagram that many queue buffer supported data in Figure 14 uplink frame queue device is distinguished, known, the operation principle of uplink frame queue device is as follows:

Grader, according to the Priority flag numerical values recited of incoming frame, sends into corresponding priority query in buffer.

Consider that the transmission rate of wireless link and bandwidth are lower than the speed of EPON system and bandwidth, efficiency is lower, in order to prevent the long-time poor efficiency of wireless user from taking link, adopting cache stored data, improving whole system resource utilization.

Many queue buffer provide differentiable multiple logic subqueue by a memory device, have multiple configurable item: the storage depth etc. of logic subqueue quantity, each subqueue.Subqueue independently can control read and write, and respectively have independently state instruction, the differentiation and the multiple data stream that realize different priorities queue collect and separate.Input data are assigned to one of multiple queue, the grade of service that each queue is corresponding different, and first QoS processor processes the queue of high priority, to guarantee the service level of whole network.

Grader and high speed many queue buffer execution priority sequence.At any time, the many queue buffer of high speed take out the frame with limit priority from each priority query, realize the scheduling of multiple queue in memory block.When each frame adds in queue, its priority relative to the frame of having queued up determined by grader.If the queue of this priority does not exist, then the queue that establishment one is new.

Export drive end select there is limit priority and not for empty queue is transmitted, once transmission, can not interrupt, even buffer newly incorporates the frame of higher priority in transmitting procedure.Priority Queuing table does corresponding renewal.

Wherein, Figure 15 is the present embodiment medium priority queue output state machine figure.

In sum, in the design, adopt EPON to access, the mass data that multiple sensor network gathers is converged in core net, be convenient to Realization analysis, monitoring, modeling, build the integrated applications such as storehouse.Along with sensor network scale is increasing, the data volume gathered grows with each passing day, and the analysis that the design overcomes big data quantity can not meet the real awkward situation analyzed and build the needs in storehouse etc. in personal computer or local area network (LAN).The design is different from the past accesses personal computer or local area network (LAN) by sensor network, achieves and multiple sensor network is converged core network access by EPON, so that integrated management, comprehensively analyze, centralized dispatching, is more convenient for gathering, analyzes, processes large data.

The transfer of data of heterogeneous network disclosed in the present embodiment and keeping method, solve QoS security problem when heterogeneous data transmits in heterogeneous network, realize the transmission of the data flow of the different grade of service, the qos parameter that heterogeneous data comprises simultaneously is kept in a stream.

Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (5)

1. the transfer of data of heterogeneous network and a keeping method, is characterized in that, comprise the following steps:
S1, up direction transfer of data, the upstream data of ONU optical network unit receiving sensor network coordinator, the Frame of described upstream data is encapsulated in the payload part of EPON data frame structure, call QoS processing policy, to different sensor networks, artificial correspondence arranges different priority, by in the header field of the field write ethernet frame of reflection priority, deliver to corresponding priority query respectively, if the sending time slots of described ONU optical network unit arrives, then ONU optical network unit sends the data of each priority query, the data flow that level of priority is high first sends, by ODN Optical Distribution Network by EPON data frame transfer to OLT optical line terminal, be then sent to the interface of the sensor network data processing center in core net,
S2, down direction transfer of data, OLT optical line terminal receives the downlink data of the sensor network data processing center in core net, by ODN Optical Distribution Network by EPON data frame transfer to ONU optical network unit, and in described ONU optical network unit, after decapsulation, revert to the heterogeneous data frame of coincidence senser network coordinator cable business interface format, be then sent to described sensor network telegon and send.
2. the transfer of data of heterogeneous network according to claim 1 and keeping method, it is characterized in that, described step S1 is specially:
The upstream data of S11, described ONU optical network unit receiving sensor network coordinator;
S12, complete the configuration of described ONU optical network unit up-downgoing controller, realize the control of up-downgoing data channel;
S13, the described upstream data received carried out to classification and extract, extract data length, text and check code, then distribute different memory spaces to store, text area, length field, check code district is comprised between described memory block, respectively length count check and CRC inspection are carried out to described upstream data, if count value equals above-mentioned data length and CRC check is correct, then the text of storage and length are skipped to next step as up ethernet frame payload data, will be dropped if count incorrect or that CRC check is wrong Frame;
S14, described up ethernet frame payload data is assembled into EPON Frame;
S15, described ethernet frame carried out priority and arrange and send into corresponding priority query respectively and carry out buffer memory afterwards, according to described QoS processing policy, export the EPON Frame of high priority, realize the scheduling of different priorities queue at many queues storage area;
S16, described OLT optical line terminal receive EPON Frame by described ODN Optical Distribution Network;
Up EPON Frame to be sent is sent to the interface of the sensor network data processing center in core net by S17, described OLT optical line terminal.
3. the transfer of data of heterogeneous network according to claim 1 and keeping method, it is characterized in that, described step S2 is specially:
S21, described OLT optical line terminal receive the downlink data of the sensor network data processing center in core net;
S22, described OLT optical line terminal send EPON Frame by described ODN Optical Distribution Network;
S23, described ONU optical network unit receive EPON Frame by described ODN Optical Distribution Network;
S24, described ONU optical network unit carry out CRC check to above-mentioned EPON Frame, the wrong EPON Frame of verification is abandoned, the errorless EPON Frame of verification is carried out address check, the EPON Frame that the MAC Address of described OLT optical line terminal or target MAC (Media Access Control) address be different from the MAC Address of described ONU optical network unit is different from for source MAC abandon, then length check is carried out to this EPON Frame, the EPON Frame not meeting length range is abandoned; According to Length Indication, revert to the heterogeneous data frame of coincidence senser network coordinator cable business interface format after taking out payload field frame number and corresponding length data, then send;
S25, described heterogeneous data frame to be stored, judged whether lost data frames simultaneously, if there is loss, reported, if do not have loss to skip to next step;
S26, complete the configuration of described ONU optical network unit up-downgoing controller, realize the control of up-downgoing data channel, and downlink data is sent to described sensor network telegon.
4. the transfer of data of heterogeneous network according to claim 1 and 2 and keeping method, it is characterized in that, described qos policy process comprises and arranges Priority flag and Priority Queuing table, according to user's needs, sensor network data corresponding for different ONU optical network unit can be arranged to different priorities mark, and respective priority thresholding in EPON frame head is set, during uplink frame classification buffer memory, Priority flag is read, form the Priority Queuing table that frame is corresponding with priority, control the many queue buffer of high speed.
5., according to transfer of data and the keeping method of the arbitrary described heterogeneous network of claims 1 to 3, it is characterized in that, the upstream data of the air interface of described sensor network telegon and downlink data are the zigbee signal meeting IEEE802.15.4 agreement.
CN201510650307.0A 2015-10-09 2015-10-09 A kind of data transmission of heterogeneous network and keeping method CN105307060B (en)

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