WO2018086564A1 - 多通道无源光网络的帧序号承载方法、装置及系统、存储介质 - Google Patents

多通道无源光网络的帧序号承载方法、装置及系统、存储介质 Download PDF

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Publication number
WO2018086564A1
WO2018086564A1 PCT/CN2017/110282 CN2017110282W WO2018086564A1 WO 2018086564 A1 WO2018086564 A1 WO 2018086564A1 CN 2017110282 W CN2017110282 W CN 2017110282W WO 2018086564 A1 WO2018086564 A1 WO 2018086564A1
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Prior art keywords
data packet
frame
optical network
passive optical
network data
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PCT/CN2017/110282
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English (en)
French (fr)
Inventor
张伟良
袁立权
黄新刚
耿丹
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP17869995.5A priority Critical patent/EP3541088B1/en
Priority to ES17869995T priority patent/ES2972536T3/es
Publication of WO2018086564A1 publication Critical patent/WO2018086564A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0064—Arbitration, scheduling or medium access control aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13216—Code signals, frame structure

Definitions

  • the present invention relates to the field of communications, and in particular, to a frame number carrying method, device and system, and storage medium for a multi-channel passive optical network.
  • IEEE NGEPON Next Generation EPON, Next Generation Etherpass Optical Network
  • 100GEPON 100Gbps EPON, 100Gbps Ethernet Passive Optical Network
  • OLTs optical line terminals
  • the optical network unit (ONU) can transmit data through multiple channels. Since multiple channels use different wavelengths, the transmission delay of NGEPON data packets on these channels may be different, so it is transmitted on multiple channels.
  • the order of the NGEPON data packets arriving at the receiving end may be different from the order of leaving the transmitting end, and the receiving end needs to solve the sequential recovery problem of the NGEPON data packets.
  • the current proposed method determines the order of NGEPON data packets in the order in which the NGEPON data packets arrive at the receiving end, that is, the NGEPON data packet that arrives at the receiving end first and then the NGEPON data packet that arrives at the receiving end.
  • the order in which the NGEPON data packets arrive at the receiving end does not correctly reflect the order of leaving the transmitting end. Therefore, in this way, the sequence recovery of the NGEPON data packets on the receiving side is realized, and many compensation techniques need to be considered. It is more complicated, and the feasibility needs further argumentation.
  • Defining the sequence number for the data packet is a more common method for sequential recovery, but as the basis for defining the NGEPON frame structure, the Ethernet frame structure and the EPON frame structure defined by the Ethernet frame structure and the 10GEPON frame structure are not defined, and from the following It can be seen from the analysis that defining the NGEPON sequence number based on the existing Ethernet, EPON, and 10GEPON frame structures will affect the existing functions, and it is difficult to maintain the existing functions and carry the frame numbers.
  • a preamble is a preamble
  • an SFD is a frame delimitation start start of frame delimiter
  • a destination address is a destination address
  • a source address is a source address
  • a Length/Type field is a payload.
  • the length or frame type, Frame Check Sequence is the frame check sequence.
  • Ethernet frame headers including preamble and SFD.
  • the receiving end In the Ethernet data transmission process, the receiving end generally needs to determine the frame start by detecting the preamble and the SFD.
  • the EPON/10GEPON frame structure is redefined based on the Ethernet frame structure.
  • 2 is a schematic structural diagram of an EPON/10GEPON frame in the related art according to the present invention, which is redefined based on an Ethernet frame structure, a preamble is a preamble, a DA is a destination address, and a SA is a source address (Len).
  • /Type field is the payload length or frame type, FCS Is the Frame Check Sequence.
  • the EPON and 10GEPON frame headers are defined as shown in Table 2.
  • the modification includes: the third byte is changed to SLD (Start of LLID delimiter, LLID start and bound), and the value is 0xd5, which is used to identify the starting position of the LLID. 6, 7 bytes are redefined as LLID (Logical Link ID), and the 8th byte is redefined as CRC, and the 3-7th byte is verified.
  • FIG. 3 is a schematic diagram of the structure of the EPON frame with SPD in the related art of the present invention.
  • the transmission of the SPD may overwrite several bytes in the preamble. Therefore, in the Ethernet passive optical network, only 0xd5, 0x55, and 0x55 of the 3rd, 4th, and 5th bytes in the frame header can be reliably used for frame header detection.
  • FIG. 4 is a schematic diagram of the SPD replacing the preamble header byte in the related art of the present invention.
  • FIG. 4 includes two cases, and the PCS layer inserts the SPD and replaces the byte of the preamble header.
  • the SPD When the SPD is in the even clock position, it replaces the first byte 0x55 in the preamble, and when the SPD is in the odd clock position, the two bytes of the preamble header are replaced with an SPD.
  • the embodiments of the present invention provide a method, a device, and a system for storing a frame number of a multi-channel passive optical network, and a storage medium, to at least solve the technical problem that the Ethernet passive optical network data packet cannot be recovered in sequence in the related art.
  • a frame sequence carrying method for a multi-channel passive optical network including: adding a frame sequence number and/or a multi-channel passive optical network data packet or a data packet fragment to be sent.
  • Frame delimitation wherein the frame sequence number is used to indicate a transmission order of the multi-channel passive optical network data packet or packet fragment, and the frame delimitation is used to indicate the multi-channel passive optical network data packet. Or the start of the frame of the packet fragmentation;
  • adding a frame sequence number to a multi-channel passive optical network data packet or a data packet fragment to be sent includes at least one of the following: a multi-channel passive optical network data packet or a data packet fragment to be transmitted. Adding the frame sequence number to the header; adding a layer of packaging in addition to the multi-channel passive optical network data packet to be sent, adding the frame sequence number in the added package; and the multi-channel passive optical network to be transmitted After the packet is fragmented, a layer of packaging is added outside the packet fragmentation, and the frame number is added to the added package.
  • adding a frame delimiter in a multi-channel passive optical network data packet or a data packet fragment to be sent includes: reusing a multi-channel passive optical network data packet to be sent or a frame fragmentation of a data packet fragment. Adding the frame delimitation to the header of the multi-channel passive optical network data packet or packet fragment to be transmitted; adding a layer of packaging in addition to the multi-channel passive optical network data packet to be transmitted, increasing Adding the frame delimitation in the package; after sharding the multi-channel passive optical network data packet to be sent, adding a layer of packaging outside the packet fragmentation, adding in the added package Frame delimitation.
  • a frame number bearing method of another Ethernet passive optical network including: receiving a multi-channel passive optical network data packet or a data packet fragmentation; and parsing the multi-channel passive optical network
  • the data packet or the data packet fragment obtains a frame delimitation and a frame sequence number carried in the multi-channel passive optical network data packet or the data packet fragment; determining the multiple according to the frame delimitation and the frame serial number respectively The sequence of the channel passive optical network data packet or the fragment start of the data packet fragment, and the transmitting end when transmitting the multi-channel passive optical network data packet or the data packet fragmentation.
  • parsing the multi-channel passive optical network data packet or data packet fragment to obtain a frame delimitation carried in the multi-channel passive optical network data packet or data packet fragment includes: physical coding
  • the layer PCS layer recovers the first m bytes of the multi-channel passive optical network data packet or the data packet fragment, wherein the m bytes are used to detect the multi-channel passive optical network data packet or data The start position of the packet fragment; the multi-channel passive optical network data packet or the data packet fragment is submitted to the MAC layer, and the MAC layer detects the multi-channel passive optical network data packet or the data packet fragment header
  • the first n bytes obtain the header of the multi-channel passive optical network data packet or the packet fragment, and obtain the frame delimitation; wherein m and n are positive integers, respectively.
  • parsing the multi-channel passive optical network data packet or the data packet fragment to obtain a frame delimitation carried in the multi-channel passive optical network data packet or the data packet fragment includes: The header of the multi-channel passive optical network packet or packet fragment parses out the frame delimitation.
  • parsing the multi-channel passive optical network data packet or data packet fragment to obtain a frame sequence number carried in the multi-channel passive optical network data packet or data packet fragment includes: acquiring at a PCS layer Frame number; when submitting a multi-channel passive optical network data packet or a data packet fragment to the MAC layer, the frame sequence number is submitted to the MAC layer through a primitive, and the multi-channel passive is obtained in the MAC layer.
  • Optical network packet or packet fragmentation and corresponding frame number includes: acquiring at a PCS layer Frame number; when submitting a multi-channel passive optical network data packet or a data packet fragment to the MAC layer, the frame sequence number is submitted to the MAC layer through a primitive, and the multi-channel passive is obtained in the MAC layer.
  • parsing the multi-channel passive optical network data packet or packet fragmentation includes: parsing the frame serial number in a header of the multi-channel passive optical network data packet or the data packet fragment.
  • the frame start and the transmit end of the multi-channel passive optical network data packet or the data packet fragment are respectively determined according to the frame delimitation and the frame serial number, and the multi-channel passive transmission is performed.
  • the method further includes: obtaining the multi-channel passive optical network data packet or the data packet fragmentation by frame delimiting by recovering and/or acquiring frame delimitation. Start and obtain the frame number to restore the sequence of multi-channel passive optical network data packets or packet fragmentation.
  • a frame number carrying device of an Ethernet passive optical network including: an adding module configured to add in a multi-channel passive optical network data packet or a data packet fragment to be sent.
  • Frame sequence number and/or frame delimitation wherein the frame sequence number is used to indicate a transmission order of the multi-channel passive optical network data packet or packet fragment, and the frame delimitation is used to indicate that the multi-channel is not a frame start of the source optical network data packet; and a sending module configured to send the multi-channel passive optical network data packet or data packet fragmentation.
  • the adding module includes: a first adding unit configured to add the frame serial number in a header of a multi-channel passive optical network data packet or a data packet fragment to be sent; a second adding unit, The method is configured to add a layer of packaging in addition to the multi-channel passive optical network data packet to be sent, and add the frame serial number in the added package; and the third adding unit is configured to be in the multi-channel passive optical network to be sent. After the packet is fragmented, a layer of packaging is added outside the packet fragmentation, and the frame number is added to the added package.
  • the adding module includes: a fourth adding unit, configured to reuse a frame delimiting of a multi-channel passive optical network data packet or a data packet fragment to be sent; and a fifth adding unit configured to be in a standby manner Adding the frame delimitation to the header of the sent multi-channel passive optical network data packet or packet fragment; the sixth adding unit is configured to be in the multi-channel passive optical network data packet to be sent Adding a layer of packaging to add the frame delimitation in the added package; the seventh adding unit is configured to slice the multi-channel passive optical network data packet to be sent after being fragmented, and outside the packet fragmentation Add a layer of packaging and add frame delimitation to the added package.
  • a frame number carrying device of another Ethernet passive optical network including: a receiving module configured to receive a multi-channel passive optical network data packet or a data packet fragment; and a parsing module, And configured to parse the multi-channel passive optical network data packet or the data packet fragment to obtain a frame delimitation and a frame sequence number carried in the multi-channel passive optical network data packet or the data packet fragment; the determining module is configured to Determining, according to the frame delimitation and the frame sequence number, a frame start of the multi-channel passive optical network data packet and a sequence of the transmitting end when transmitting the multi-channel passive optical network data packet.
  • the apparatus further includes: an obtaining module, configured to determine, at the determining module, a frame start of the multi-channel passive optical network data packet according to the frame delimitation and the frame serial number respectively After the sending end sends the multi-channel passive optical network data packet, the frame is delimited by the frame to obtain the start of the multi-channel passive optical network data packet or the data packet fragmentation; the recovery module is configured as The sequence of multi-channel passive optical network data packets or data packet fragments is recovered by the frame sequence number.
  • the parsing module includes: a restoring unit configured to recover the first m bytes of the multi-channel passive optical network data packet or the data packet fragment in the physical coding layer PCS layer, where The m bytes are used to detect the starting position of the multi-channel passive optical network data packet or the data packet fragmentation; the submitting unit is configured to submit the multi-channel passive optical network data packet or the data packet fragmentation To the MAC layer, the MAC layer obtains the header of the multi-channel passive optical network data packet or the packet fragment by detecting the multi-channel passive optical network data packet or the first n bytes of the packet fragmentation header, and obtains The frame is delimited; wherein m and n are positive integers, respectively.
  • the parsing module includes: an obtaining unit configured to acquire a frame serial number at a PCS layer; and a processing unit configured to submit a multi-channel passive optical network data packet to the MAC layer or At the same time, the frame number of the data packet is submitted to the MAC layer by primitives, and the multi-channel passive optical network data packet or the data packet fragment and the corresponding frame sequence number are obtained in the MAC layer.
  • a frame number bearing system of an Ethernet passive optical network including a transmitting end and a receiving end, where the transmitting end includes: an adding module configured to be in a multi-channel passive to be transmitted. Adding a frame number and/or a frame delimiter to the optical network data packet or the packet fragment, wherein the frame sequence number is used to indicate a sending sequence of the multi-channel passive optical network data packet or the data packet fragment, The frame delimitation is used to indicate a frame start of the multi-channel passive optical network data packet or the data packet fragmentation, and the sending module is configured to send the multi-channel passive optical network data packet or the data packet fragment;
  • the receiving end includes: a receiving module configured to receive a multi-channel passive optical network data packet or a data packet fragmentation; and a parsing module configured to parse the multi-channel passive optical network data packet or the data packet fragment to be carried in the a frame delimitation and/or frame sequence number in a multi-channel passive optical network data packet or
  • Adding a frame number and/or frame delimitation to the multi-channel passive optical network data packet or packet fragment to be sent where the frame sequence number is used to indicate the multi-channel passive optical network data packet or data packet a sequence of sending the fragments, the frame delimitation is used to indicate a frame start of the multi-channel passive optical network data packet or the data packet fragmentation;
  • the technical solution of the embodiment of the present invention adds a frame sequence number and/or a frame delimitation in a multi-channel passive optical network data packet or a data packet fragment to be sent, where the frame sequence number is used to indicate that the multi-channel is not a transmission sequence of a source optical network data packet or a data packet fragment, the frame delimitation being used to indicate a frame start of the multi-channel passive optical network data packet or a data packet fragment; and transmitting the multi-channel
  • the passive optical network data packet or data packet fragmentation by adding the frame sequence number in the NGEPON data packet, and also ensuring the normal function of the NGEPON data packet, solves the technical problem that the NGEPON data packet cannot be recovered in order in the related art, and improves the technical problem. Processing efficiency of NGEPON data packets.
  • FIG. 1 is a schematic structural diagram of an Ethernet frame in the related art of the present invention.
  • FIG. 2 is a schematic structural diagram of an EPON/10GEPON frame in the related art of the present invention.
  • FIG. 3 is a schematic structural diagram of an EPON frame with SPD in the related art of the present invention.
  • FIG. 4 is a schematic diagram of an SPD replacing a preamble header byte in the related art of the present invention
  • FIG. 5 is a flowchart of a frame number bearing method of a multi-channel passive optical network according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a layered model of an EPON protocol according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of a frame number bearing method of another multi-channel passive optical network according to an embodiment of the present invention.
  • FIG. 8 is a structural block diagram of a frame number carrying device of a multi-channel passive optical network according to an embodiment of the present invention.
  • FIG. 9 is a structural block diagram of a frame number carrying device of another multi-channel passive optical network according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram showing the relationship between a MAC layer and a PCS layer according to an embodiment of the present invention.
  • Figure 11 is a schematic diagram 1 of the processing of the transmitting side in the first embodiment of the present invention.
  • Figure 12 is a schematic diagram 1 of the receiving side processing in the first embodiment of the present invention.
  • FIG. 13 is a second schematic diagram of processing on the transmitting side according to an embodiment of the present invention.
  • FIG. 14 is a schematic diagram 2 of a receiving side processing according to a specific embodiment of the present invention.
  • 15 is a schematic diagram of processing on a receiving side in a second embodiment of the present invention.
  • Figure 16 is a schematic diagram of processing on the receiving side of the second embodiment of the present invention.
  • 17 is a schematic diagram of processing on the transmitting side of a third embodiment of the present invention.
  • FIG. 18 is a schematic diagram of processing on the receiving side of a third embodiment of the present invention.
  • 19 is a schematic diagram of processing on the receiving side of the fourth embodiment of the present invention.
  • FIG. 20 is a schematic diagram of processing on the transmitting side of a fifth embodiment of the present invention.
  • 21 is a schematic diagram of processing on the receiving side of a fifth embodiment of the present invention.
  • FIG. 22 is a schematic diagram of processing on the transmitting side of a sixth embodiment of the present invention.
  • FIG. 23 is a schematic diagram of processing on the receiving side of a sixth embodiment of the present invention.
  • Figure 24 is a schematic diagram of processing on the transmitting side of a seventh embodiment of the present invention.
  • Figure 25 is a schematic diagram of processing on the receiving side of a seventh embodiment of the present invention.
  • FIG. 5 is a flowchart of a frame serial number carrying method of a multi-channel passive optical network according to an embodiment of the present invention, as shown in FIG. 5 . As shown, the process includes the following steps:
  • Step S502 adding a frame sequence number and/or frame delimitation in a multi-channel passive optical network data packet or a data packet fragment to be sent, where the frame sequence number is used to indicate a multi-channel passive optical network data packet or a data packet.
  • the transmission order of the slices, the frame delimitation is used to indicate the frame start of the multi-channel passive optical network data packet or the packet fragmentation;
  • Step S504 transmitting a multi-channel passive optical network data packet or a data packet fragment.
  • frame number and frame delimitation are added to the multi-channel passive optical network data packet or packet fragment to be sent, wherein the frame sequence number is used to indicate multi-channel passive optical network data packet or data packet fragmentation.
  • the transmission order, frame delimitation is used to indicate the start of the frame of the multi-channel passive optical network data packet or packet fragmentation; the transmission of the multi-channel passive optical network data packet or packet fragmentation through the multi-channel passive optical
  • the frame number is added to the network data packet or the data packet fragment. Since the frame number is carried in the multi-channel passive optical network data packet or the data packet fragment, the detection of the frame start may be destroyed, so the MAC is also required to be received at the receiving end.
  • the layer and other layers cooperate with the detection of the start of the recovery frame to obtain the frame number, and also ensure the normal function of the multi-channel passive optical network data packet or the data packet fragmentation, and solve the problem that the multi-channel cannot be restored in sequence in the related art.
  • the technical problem of the source optical network data packet improves the processing efficiency of the multi-channel passive optical network data packet.
  • the execution body of the above steps may be an OLT, an ONU, or the like, but is not limited thereto.
  • the solution of this embodiment also relates to two aspects, one is a protocol layered structure of an Ethernet passive optical network, and the other is a number space of a frame sequence number.
  • 6 is a schematic diagram of a layered model of an EPON protocol according to an embodiment of the present invention, and a layered structure of an Ethernet passive optical network protocol is shown in FIG. 6:
  • PCS layer Three important layers are the PCS layer, the RS layer, and the MAC layer.
  • a PCS (Physical coding sublayer) layer the function includes encoding data bits into a code group that can be transmitted on a physical medium.
  • the RS (Reconciliation sublayer) layer provides a match between the xMII layer signal and the MAC layer service.
  • the MAC (Media Access Control) layer defines media-independent functions, including the desire to send data at the physical layer and receive data from the physical layer.
  • the MAC layer defines data encapsulation (such as framing, addressing, error detection) and media access (such as collision detection, error handling).
  • Embodiments of the present invention relate to a hierarchy involved in MAC frame correlation processing, which is merely a preferred solution provided by the present invention. These related processes may be implemented at other levels without violating relevant processing principles and/or sequences, and thus Within the scope of the protection of the invention.
  • the frame sequence number generally has a range.
  • the present invention uses the FSN (Frame Sequence Number) field as an example, but does not limit the FSN to adopt other value ranges. Other values can be easily derived from the present invention. It is within the scope of the invention.
  • the manner in which the MAC frame of the multi-channel Ethernet passive optical network carries the frame number can be completed according to the following specific embodiments.
  • the FSN is numbered starting from 0. Each time a multi-channel Ethernet passive optical network MAC frame is sent, the FSN is incremented by one, and after a maximum value of 65535, if a multi-channel Ethernet passive optical network MAC frame is sent, the FSN returns to 0. From the receiving end, when receiving a multi-channel Ethernet passive optical network MAC frame with an FSN of 65535, the FSN of the next multi-channel Ethernet passive optical network MAC frame should be zero.
  • the OLT When the OLT sends a multi-channel Ethernet passive optical network MAC frame for each LLID of each ONU, it maintains an independent FSN number space. Different LLIDs have different FSN number spaces, and each ONU is assigned a different LLID.
  • the multi-channel Ethernet passive optical network MAC carries different LLIDs of different ONUs to form mutually independent FSN number spaces.
  • the ONU receives the multi-channel Ethernet passive optical network MAC frame, it is judged by the LLID field in the MAC frame. It is not sent to itself. After filtering the multi-channel Ethernet passive optical network MAC through LLID, it then sequentially responds to the multi-channel Ethernet passive optical network MAC frame according to the FSN.
  • the FSN domain is filled in the FSN domain and the multi-channel Ethernet passive optical light carrying the FSN domain.
  • the network MAC frame enters the bound multiple channels for transmission in a certain way (round robin, the earliest transmission time, etc.).
  • the ONU side performs receiving processing according to the following embodiments or other methods, and the RS layer or the MAC layer pairs the received multi-channel Ethernet passive optical network.
  • the MAC frame is buffered to a certain extent, and the received MAC frames of the multi-channel Ethernet passive optical network are sequentially restored according to the FSN domain.
  • the FSN may not be needed. If the reserved FSN is only redundant information at the receiving end.
  • the OLT transmits the MAC address of the multi-channel Ethernet passive optical network, it can directly increase the FSN domain without distinguishing whether the channel is bound or not. It can also determine whether the target ONU is bound to the channel.
  • the receiving side performs unified processing in the manner of the following embodiments regardless of the processing on the transmitting side.
  • the ONU sends a multi-channel Ethernet passive optical network MAC frame to the OLT, and maintains an independent FSN number space for each LLID, and transmits the same as the downlink.
  • the OLT needs to distinguish which ONU the multi-channel Ethernet passive optical network MAC comes from according to the LLID or MAC address of the ONU, and establish a corresponding FSN number space judgment domain.
  • the sending side maintains a current sending number for each LLID. Each time the current sending number is acquired, it will be incremented before the next acquisition. If the current sending number is greater than the maximum value, it is set to the minimum value.
  • the receiving side maintains a current receiving number for each LLID.
  • the current receiving number is automatically incremented by one every time it is confirmed. If the current receiving number is greater than the maximum value, it is set to the minimum value.
  • adding a frame sequence number to a multi-channel passive optical network data packet or a data packet fragment to be sent includes the following scenarios:
  • a layer of packaging is added outside the data packet fragment, and a frame serial number is added in the added packaging.
  • the header (preamble portion) includes 8 bytes, and the frame number is carried in the 4th and 5th bytes of the leading portion.
  • the frame number ranges from 0 to 65535, wherein each number corresponds to a frame number of a multi-channel passive optical network data packet.
  • adding frame delimitation in a multi-channel passive optical network data packet or packet fragment to be sent includes the following scenarios:
  • a layer of packaging is added in addition to the packet fragmentation, and frame delimitation is added in the added package.
  • FIG. 7 is a multi-channel passive optical network according to an embodiment of the present invention.
  • a flowchart of a receiving method carried by a frame sequence number, as shown in FIG. 7, the process includes the following steps:
  • Step S702 receiving a multi-channel passive optical network data packet or a data packet fragmentation
  • Step S704 parsing a multi-channel passive optical network data packet or a data packet fragment to obtain a frame delimitation and a frame sequence number carried in a multi-channel passive optical network data packet or a data packet fragment;
  • Step S706 determining, according to the frame delimitation and the frame number, respectively, the multi-channel passive optical network data packet or the frame start and the transmitting end of the data packet fragment are transmitting the multi-channel passive optical network data packet or data. The order in which the packets are fragmented.
  • the method further includes: By recovering and/or acquiring frame delimitation, obtaining the start of multi-channel passive optical network data packet or packet fragmentation by frame delimitation, further obtaining the frame serial number, and restoring the multi-channel passive optical network data packet or data The order in which the packets are fragmented.
  • Frame delimitation in passive optical network data packets or packet fragments includes:
  • multi-channel passive optical network data packets or packet fragmentation frames to be transmitted are not reused
  • multi-channel passive optical network data packets or data packet fragments are parsed to be carried in multiple channels.
  • Frame delimitation in passive optical network data packets or packet fragmentation includes parsing frame delimitation at the head of a multi-channel passive optical network data packet or packet fragmentation.
  • parsing the multi-channel passive optical network data packet or the data packet fragment to obtain the frame sequence number carried in the multi-channel passive optical network data packet or the data packet fragment includes:
  • parsing the multi-channel passive optical network data packet or the data packet fragment to obtain the frame sequence number carried in the multi-channel passive optical network data packet or the data packet fragment includes: the data in the multi-channel passive optical network The header of the packet or packet fragment parses the frame number.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods of various embodiments of the present invention.
  • a frame number carrying device and a system for a multi-channel passive optical network are also provided, which are configured to implement the foregoing embodiments and preferred embodiments, and are not described again.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 8 is a structural block diagram of a frame number carrying device of a multi-channel passive optical network according to an embodiment of the present invention. As shown in FIG. 8, the device includes:
  • the adding module 80 is configured to add a frame sequence number and/or a frame delimitation in the multi-channel passive optical network data packet or the data packet fragment to be sent, where the frame serial number is used to indicate the multi-channel passive optical network data packet or The order in which the packet fragments are sent, and the frame delimitation is used to indicate the frame start of the multi-channel passive optical network data packet or packet fragmentation;
  • the sending module 82 is configured to send a multi-channel passive optical network data packet or a data packet fragment.
  • the adding module further includes: a first adding unit, configured to add a frame sequence number to the multi-channel passive optical network data packet or the packet fragment header to be sent; and the second adding unit is configured to be Adding a layer of packaging in addition to the sent multi-channel passive optical network data packet or packet fragmentation, adding a frame sequence number in the added package; and the third adding unit configured to be in the multi-channel passive optical network data to be transmitted After the packet is fragmented, a layer of packaging is added in addition to the packet fragmentation, and the frame number is added to the added package.
  • the header (preamble portion) comprises 8 bytes and the frame sequence number is carried in the 4th and 5th bytes of the preamble portion.
  • the adding module includes: a fourth adding unit configured to reuse a multi-channel passive optical network data packet to be sent or a frame delimiting of the data packet fragment; and a fifth adding unit configured to be sent Adding frame delimitation to the header of the multi-channel passive optical network data packet or packet fragmentation; the sixth adding unit is configured to add a layer of packaging in addition to the multi-channel passive optical network data packet to be transmitted, in addition Adding a frame delimiter in the package; the seventh adding unit is configured to add a layer of packaging outside the packet fragmentation after adding the multi-channel passive optical network data packet to be sent, and adding in the added package Frame delimitation.
  • FIG. 9 is a structural block diagram of a frame number carrying device of another multi-channel passive optical network according to an embodiment of the present invention. As shown in FIG. 9, the method includes:
  • the receiving module 90 is configured to receive a multi-channel passive optical network data packet or a data packet fragmentation
  • the parsing module 92 is configured to parse the multi-channel passive optical network data packet to obtain a frame serial number and frame delimitation carried in the multi-channel passive optical network data packet or the data packet fragment;
  • the determining module 94 is configured to determine a frame start of the multi-channel passive optical network data packet and a sequence of the transmitting end when transmitting the multi-channel passive optical network data packet according to the frame delimitation and the frame serial number, respectively.
  • the apparatus further includes: an acquiring module, configured to determine, at the frame start and the transmitting end, the multi-channel passive optical network data packet is sent by the determining module according to the frame delimitation and the frame serial number respectively After the sequence of the multi-channel passive optical network data packet, the multi-channel passive optical network data packet or the start of the data packet fragmentation is obtained through frame delimitation; the recovery module is configured to recover the multi-channel passive optical network by the frame serial number The order in which packets or packets are fragmented.
  • the parsing module comprises: a restoring unit configured to recover the first m bytes of the multi-channel passive optical network data packet or the data packet fragment in the physical coding layer PCS layer, where m bytes are used Detecting the starting position of the multi-channel passive optical network data packet or the data packet fragmentation; the submitting unit is configured to submit the multi-channel passive optical network data packet or the data packet fragment to the MAC layer, and the MAC layer detects multiple channels without detecting The n-bytes of the header of the source optical network packet or the header of the preamble portion obtain the frame number; wherein m and n are positive integers, respectively.
  • the parsing module includes: an acquiring unit configured to acquire a frame serial number in the PCS layer; and a processing unit configured to submit the frame serial number to the MAC through the primitive at the same time as submitting the multi-channel passive optical network data packet or the data packet fragment to the MAC layer Layer, and obtain multi-channel passive optical network data packet or packet fragmentation and corresponding frame sequence number in the MAC layer.
  • the embodiment further provides a frame serial number carrying system of a multi-channel passive optical network, which includes a transmitting end and a receiving end, and the transmitting end includes: an adding module configured to be in a multi-channel passive optical network data packet or data to be sent.
  • the frame number and frame delimitation are added to the packet fragmentation, wherein the frame sequence number is used to indicate the transmission sequence of the multi-channel passive optical network data packet or the data packet fragment, and the frame delimitation is used to indicate the multi-channel passive optical network data packet.
  • the sending module is configured to send the multi-channel passive optical network data packet or the data packet fragmentation
  • the receiving end comprises: a receiving module configured to receive the multi-channel passive optical network data packet or the data Packet fragmentation; parsing module configured to parse multi-channel passive optical network data packets or data packet fragments to obtain frame number and frame delimitation carried in multi-channel passive optical network data packets or data packet fragments; determining module And configured to determine, according to the frame delimitation and the frame sequence number, a frame start of the multi-channel passive optical network data packet and a sequence of the transmitting end when transmitting the multi-channel passive optical network data packet.
  • each of the above modules can be implemented by software or hardware.
  • the latter can be implemented in the following manner, but is not limited thereto: the above modules are all located in the same processor; or, the above modules are respectively located in different processors in any combination.
  • Embodiment 3 of the multi-channel Ethernet passive optical network system can realize the data transmission method of carrying the frame serial number and ensuring that the receiving end correctly recognizes the start of the frame, and can be applied not only to NGEPON but also to EPON/10GEPON. Used in other passive optical network systems.
  • This embodiment provides a frame serial number carrying and can ensure the receiving end
  • FIG. 10 is a schematic diagram showing the relationship between a MAC layer and a PCS layer in the embodiment of the present invention. As shown in FIG. 10, it is the same as FIG. 6, wherein two important layers are a PCS layer and a MAC layer.
  • PCS Physical coding sublayer
  • the function includes encoding data bits into a code group that can be transmitted on a physical medium.
  • the MAC (Media Access Control) layer defines the functions of independent and medium, including transmitting data to and receiving data from the physical layer.
  • the MAC layer defines data encapsulation (such as framing, addressing, error detection) and media access (such as collision detection, error handling).
  • the frame sequence number is carried in the multi-channel passive optical network data packet or the data packet fragment to indicate the sequence of the Ethernet passive optical network data packet or the data packet fragment transmission. Since the frame number is carried in the multi-channel passive optical network data packet or the packet fragment destroys the detection of the frame start, the detection of the start of the frame is also performed at the receiving end through the MAC layer and other layers, and Frame number. The receiving end determines the sequence of the multi-channel passive optical network data packet or the data packet fragment according to the frame number.
  • the receiving end can be based on multiple The frame number in the channel passive optical network data packet or frame data packet fragment to recover the transmission sequence of the multi-channel passive optical network data packet or the data packet fragment.
  • the carrying of the frame number is increased, and the detection of the frame start is also ensured.
  • the 4th and 5th bytes of the Preamble are used to carry the NGEPON MAC frame sequence number, and the 0x55 and 0x55 of the 1st and 2nd bytes are restored at the receiving end PCS layer for detecting the start of the MAC frame.
  • the 4th and 5th bytes in the preamble are used to carry the Ethernet frame number.
  • the PCS layer on the receiving side recovers after detecting the SPD.
  • the two bytes 0x55 and 0x55 of the preamble header are submitted to the MAC layer, and the MAC layer detects the start position of the Ethernet frame by detecting 0x55, 0x55, 0xd5 in the first, second, and third bytes of the preamble header.
  • FIG. 11 is a schematic diagram of processing on the transmitting side in the first embodiment of the present invention
  • FIG. 11 is a schematic diagram of a process of transmitting data packets in an Ethernet passive optical network.
  • the frame sequence number FSN Frarame Sequence Number
  • the Ethernet passive optical network data packet passes through the RS layer and the xMII layer and enters the PCS layer.
  • the processing of the PCS layer does not change.
  • the SPD is inserted to replace the Ethernet passive.
  • the 0x55 byte of the optical network packet header is transmitted after being processed by the PMA, PMD, and MDI layers.
  • FIG. 12 is a schematic diagram of processing on the receiving side in the first embodiment of the present invention
  • FIG. 12 is a schematic diagram of processing on the receiving side.
  • the PCS layer After detecting the SPD, the PCS layer replaces it with 0x55, submits the MAC frame to the MAC layer, and the MAC layer detects 0x55/0x55.
  • the /0xd5 sequence obtains the frame start, and then obtains the frame number FSN, which is used to restore the Ethernet passive optical network packet sequence.
  • the 4th and 5th bytes in the MAC frame header are used as the frame sequence number field to carry the frame sequence number, considering that the transmitting side PCS layer may cover the first byte of the MAC frame header when the SPD layer is inserted. Or the first and second bytes, in order to keep the receiving side able to detect the start of the MAC frame, the receiving side PCS layer will restore the first byte (0x55) or the first and second bytes (0x55, 0x55) of the MAC frame, For the receiving side to detect the start of the frame.
  • FIG. 13 is a second schematic diagram of processing on the transmitting side according to an embodiment of the present invention, and the example covers a 0x55.
  • FIG. 14 is a schematic diagram of a receiving side processing according to a specific embodiment of the present invention. The example covers a 0x55.
  • the specific steps of this embodiment include: (Steps 1-4 are processing on the transmitting side, as shown in FIG. Step 5-7 is the processing on the receiving side, as shown in Figure 14):
  • the MAC layer on the transmitting side forms a MAC frame, and submits the MAC frame to the RS layer on the transmitting side;
  • the RS layer obtains the current transmission number corresponding to the LLID as the frame number FSN of the MAC frame according to the LLID corresponding to the MAC frame, and puts the LLID into the LLID field of the MAC frame header, and puts the frame sequence number into the frame in the MAC frame header.
  • the sequence number field is the 4th and 5th bytes, and then the MAC frame is submitted to the transmitting side PCS layer through the xMII interface;
  • the SPD is inserted when the MAC frame is submitted to the PMA layer, and the first byte or the first and second bytes of the MAC frame are overwritten according to the sending clock condition;
  • the MAC frame continues to be processed by the transmitting side PMA layer, the PMD layer, the MDI layer, and transmitted to the receiving side through the media layer;
  • the MAC frame is processed by the receiving side media layer, the MDI layer, the PMD layer, and the PMA layer, and submitted to the receiving side PCS layer;
  • the receiving side PCS layer determines whether the next byte is 0x55 or 0xd5. If it is 0x55, insert a 0x55 after the SPD to recover a byte 0x55 of the MAC header header. If it is 0xd5, Then insert 2 0x55 after the SPD, recover the two bytes 0x55, 0x55 of the header of the MAC frame header, and then submit the MAC frame to the RS layer of the receiving side through the xMII interface;
  • the receiving side RS layer obtains the MAC frame start position by detecting the first, second, and third bytes of the MAC header header, that is, 0x55, 0x55, and 0xd5, and the LLID field and the frame number field in the frame header of the MAC frame.
  • the LLID and the frame number are respectively obtained. If the acquired frame number is the current receiving number of the LLID, the MAC frame is submitted to the MAC layer, the current receiving number is incremented by 1, and the MAC frame with the same receiving number in the buffer is forwarded. Otherwise, the MAC frame will be received for buffering;
  • the 4th and 5th bytes of the Preamble are used to carry the NGEPON MAC frame sequence number, and the FSN domain is obtained at the receiving end PCS layer.
  • the FSN domain is submitted to the MAC layer through the primitive.
  • the 4th and 5th bytes of the preamble are directly carried by the frame number FSN.
  • the receiving side PCS layer can detect the SPD and obtain the Ethernet frame starting position.
  • the 4th and 5th bytes are replaced with 0x55, 0x55, and the frame number is submitted to the MAC layer through the primitive.
  • the transmission side processing is the same as that of FIG.
  • the PCS layer After detecting the SPD, the PCS layer extracts the FSN domain, saves the FSN, and replaces the FSN domain with 0x55 and 0x55, submits the MAC frame to the MAC layer, and passes the FSN. The primitive is also submitted to the MAC layer.
  • the MAC layer detects the 0xd5/0x55/0x55 sequence to obtain the frame start, and obtains the frame number FSN through the primitive to restore the NGEPON MAC frame sequence.
  • the 4th and 5th bytes in the MAC frame header are used as the frame sequence number field to carry the frame sequence number, considering that the transmitting side PCS layer may cover the first byte of the MAC frame header when the SPD layer is inserted. Or the first and second bytes, in order to keep the receiving side able to detect the start of the MAC frame, the FSN field is acquired at the receiving side PCS layer, and the FSN field in the MAC frame is replaced with 0x55, 0x55, and the third of the MAC frame header.
  • Step 1-4 is a processing on the transmitting side, as shown in FIG. 13
  • Step 5-7 is a processing on the receiving side
  • FIG. 16 is a schematic diagram of processing on the receiving side of the second embodiment of the present invention, and example coverage is performed.
  • the MAC layer on the transmitting side forms a MAC frame, and submits the MAC frame to the RS layer on the transmitting side;
  • the RS layer obtains the current transmission number corresponding to the LLID as the frame sequence number FSN (Frame Sequence Number) of the MAC frame according to the LLID corresponding to the MAC frame, and puts the LLID into the LLID field of the MAC frame header, and puts the frame sequence number into the MAC address.
  • FSN Framework Sequence Number
  • the frame number field in the frame header is the 4th and 5th bytes, and then the MAC frame is submitted to the transmitting side PCS layer through the xMII interface;
  • the SPD is inserted when the MAC frame is submitted to the PMA layer, and the first byte or the first and second bytes of the MAC frame are overwritten according to the sending clock condition;
  • the MAC frame continues to be processed by the transmitting side PMA layer, the PMD layer, the MDI layer, and transmitted to the receiving side through the media layer;
  • the MAC frame is processed by the receiving side media layer, the MDI layer, the PMD layer, and the PMA layer, and submitted to the receiving side PCS layer;
  • the receiving side PCS layer determines whether the next byte is 0x55 or 0xd5. If it is 0x55, the FSN field is after 0xd5, if it is 0xd5, the FSN domain is after 0xd5. Extract the FSN domain and replace the FSN domain with 0x55 and 0x55, and then submit the MAC frame and the FSN domain value to the receiving side RS layer through the xMII interface.
  • the receiving side RS layer obtains the MAC frame and the corresponding FSN domain value, and obtains the MAC frame start position by detecting the 0xd5, 0x55, and 0x55 sequences of the MAC frame header, and obtains the LLID from the LLID field in the MAC frame header, from the FSN domain.
  • the value is obtained by the frame number. If the obtained frame number is the current receiving number of the LLID, the MAC frame is submitted to the MAC layer, the current receiving number is incremented by 1, and the MAC frame with the same receiving number in the buffer is forwarded. Otherwise, A MAC frame is received for caching.
  • the transmitting side PCS layer does not insert the SPD.
  • the bytes in the header of the MAC header in the PCS layer are not replaced.
  • the 4th and 5th bytes in the MAC frame header are used as the frame sequence number field, and are used to carry the frame sequence number.
  • the transmitting side carries the frame number of the 4th and 5th bytes in the MAC frame header, and the receiving side PCS.
  • the layer does not detect the SPD, the layer directly submits the frame to the RS layer, and the receiving side RS layer detects the start position of the Ethernet frame by detecting 0x55, 0x55, 0xd5 in the first, second, and third bytes of the header header. .
  • Step 1-4 is a processing on the transmitting side
  • FIG. 17 is a schematic diagram of processing on the transmitting side according to Embodiment 3 of the present invention.
  • Step 5-7 is processing on the receiving side.
  • 18 is a schematic diagram of processing on the receiving side of the third embodiment of the present invention, as shown in FIG. 18:
  • the MAC layer on the transmitting side forms a MAC frame, and submits the MAC frame to the RS layer on the transmitting side;
  • the RS layer obtains the current transmission number corresponding to the LLID as the frame sequence number FSN (Frame Sequence Number) of the MAC frame according to the LLID corresponding to the MAC frame, and puts the LLID into the LLID field of the MAC frame header, and puts the frame sequence number into the MAC address.
  • FSN Framework Sequence Number
  • the frame number field in the frame header is the 4th and 5th bytes, and then the MAC frame is submitted to the transmitting side PCS layer through the xMII interface;
  • the MAC frame continues to be processed by the transmitting side PMA layer, the PMD layer, the MDI layer, and transmitted to the receiving side through the media layer;
  • the MAC frame is processed by the receiving side media layer, the MDI layer, the PMD layer, and the PMA layer, and submitted to the receiving side PCS layer;
  • the receiving side PCS layer submits the MAC frame to the receiving side RS layer through the xMII interface;
  • the receiving side RS layer obtains the MAC frame start position by detecting the first, second, and third bytes of the MAC header header, that is, 0x55, 0x55, and 0xd5, and the LLID field and the frame number field in the frame header of the MAC frame.
  • the LLID and the frame number are respectively obtained. If the acquired frame number is the current receiving number of the LLID, the MAC frame is submitted to the MAC layer, the current receiving number is incremented by 1, and the MAC frame with the same receiving number in the buffer is forwarded. Otherwise, the MAC frame will be received for buffering.
  • the byte of the MAC frame header in the PCS layer is not replaced.
  • the 4th and 5th bytes in the MAC frame header are used as the frame sequence number field to carry the frame sequence number.
  • the FSN domain is acquired on the receiving side PCS layer. And replacing the FSN field in the MAC frame with 0x55, 0x55, 0x55, 0x55, 0xd5, 0x55, 0x55 of the 1, 2, 3, 4, 5 bytes of the MAC frame header or any combination thereof for detecting the MAC frame Initially, the receiving side PCS layer submits the acquired FSN domain value to the receiving side RS layer through the primitive while submitting the MAC frame to the receiving side RS layer.
  • Step 1-4 is a processing on the transmitting side
  • step 5-7 is a processing on the receiving side
  • FIG. 19 is a schematic diagram of processing on the receiving side of the fourth embodiment of the present invention. As shown in Figure 19:
  • the MAC layer on the transmitting side forms a MAC frame, and submits the MAC frame to the RS layer on the transmitting side;
  • the RS layer obtains the current transmission number corresponding to the LLID as the frame sequence number FSN (Frame Sequence Number) of the MAC frame according to the LLID corresponding to the MAC frame, and puts the LLID into the LLID field of the MAC frame header, and puts the frame sequence number into the MAC address.
  • FSN Framework Sequence Number
  • the frame number field in the frame header is the 4th and 5th bytes, and then the MAC frame is submitted to the transmitting side PCS layer through the xMII interface;
  • the MAC frame continues to be processed by the transmitting side PMA layer, the PMD layer, the MDI layer, and transmitted to the receiving side through the media layer;
  • the MAC frame is processed by the receiving side media layer, the MDI layer, the PMD layer, and the PMA layer, and submitted to the receiving side PCS layer;
  • the receiving side PCS layer detects the FSN domain by detecting, the idle or other feature content before the MAC frame, or the content in the MAC frame header, extracting the FSN domain and replacing the FSN domain with 0x55, 0x55, and then submit the MAC frame and the FSN domain value to the receiving side RS layer through the xMII interface;
  • the receiving side RS layer obtains the MAC frame and the corresponding FSN domain value, and obtains the MAC frame start position by detecting the 0x55, 0x55, 0xd5, 0x55, 0x55 sequence of the MAC frame header or any combination thereof, from the MAC frame header.
  • the LLID field obtains the LLID, and obtains the frame number from the FSN domain value. If the obtained frame number is the current receiving number of the LLID, the MAC frame is submitted to the MAC layer, the current receiving number is incremented by 1, and the buffer is the same as the current receiving number. The MAC frame is forwarded, otherwise the MAC frame will be received for buffering;
  • a layer of encapsulation is added outside the MAC frame for carrying the frame sequence number and related information, including the frame sequence number, the frame number start (such as 0xe5, of course, other values may be used), and other starting contents (such as two 0x55).
  • the added encapsulation layer can be added at the sender MAC layer. Then, the sender and the receiver do not process at the RS layer.
  • the receiver RS layer directly submits the MAC frame of the encapsulation layer to the MAC layer, and the receiving side detects 0x55 and 0x55. 0xe5 byte sequence, thereby obtaining an outer layer encapsulated MAC frame, and further parsing the subsequent LLID and FSN to restore the Ethernet passive optical network frame sequence.
  • a layer of encapsulation is added outside the MAC frame, including 0x55, 0x55, 0xe5, and a two-byte frame sequence number field, and the frame sequence number field is used to carry the frame sequence number, and the frame serial number domain bearer in the encapsulation added on the transmitting side Frame number, the receiving side PCS layer directly submits the frame to the RS layer, and the receiving side RS layer detects the MAC frame start position by detecting 0x55, 0x55, 0xe5 in the first, second, and third bytes of the header header.
  • Step 1-4 is a processing on the transmitting side
  • FIG. 20 is a schematic diagram of processing on the transmitting side according to Embodiment 5 of the present invention.
  • Step 5-7 is processing on the receiving side.
  • Figure 21 is a schematic diagram of processing on the receiving side of the fifth embodiment of the present invention, as shown in Figure 21:
  • the MAC layer on the transmitting side forms a MAC frame, and submits the MAC frame to the RS layer on the transmitting side;
  • the RS layer puts the corresponding LLID field of the MAC frame header according to the LLID corresponding to the MAC frame, and obtains the current transmission number corresponding to the LLID as the frame sequence number FSN (Frame Sequence Number) of the MAC frame, and sequentially increases 0x55 outside the MAC frame. 0x55, 0xe5 and FSN, and then submit the MAC frame to the transmitting side PCS layer through the xMII interface;
  • FSN Framework Sequence Number
  • the MAC frame continues to be processed by the transmitting side PMA layer, the PMD layer, the MDI layer, and transmitted to the receiving side through the media layer;
  • the MAC frame is processed by the receiving side media layer, the MDI layer, the PMD layer, and the PMA layer, and submitted to the receiving side PCS layer;
  • the receiving side PCS layer submits the MAC frame to the receiving side RS layer through the xMII interface;
  • the receiving side RS layer obtains the MAC frame start position by detecting the first, second, and third bytes of the MAC header header, that is, 0x55, 0x55, and 0xe5, and the frame sequence number field and the LLID field in the frame header of the MAC frame.
  • the LLID and the frame number are respectively obtained. If the acquired frame number is the current receiving number of the LLID, the MAC frame is submitted to the MAC layer, the current receiving number is incremented by 1, and the MAC frame with the same receiving number in the buffer is forwarded. Otherwise, the MAC frame will be received for buffering;
  • the MAC frame header is redefined, the frame sequence number is added after the LLID, and the LLID and the frame sequence number field are protected by the CRC area.
  • the MAC frame header is redesigned, and a 2-byte FSN field is added to the LLID field of the original MAC header to carry the frame number, and the CRC performs check protection on the SLD, LLID, and FSN.
  • the LLID and the FSN are added on the transmitting side RS layer, and the receiving side detects the 0x55, 0x55, 0xd5, 0x55, 0x55 byte sequence or any combination thereof, thereby obtaining the MAC frame header, and further parsing the subsequent LLID and FSN.
  • the receiving side detects the 0x55, 0x55, 0xd5, 0x55, 0x55 byte sequence or any combination thereof, thereby obtaining the MAC frame header, and further parsing the subsequent LLID and FSN.
  • Step 1-4 is a processing on the transmitting side
  • FIG. 5 is a schematic diagram of processing on the transmitting side of the sixth embodiment.
  • step 5-7 is processing on the receiving side
  • FIG. 23 is DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Sixth processing diagram of the receiving side, as shown in FIG.
  • the MAC layer on the transmitting side forms a MAC frame, and submits the MAC frame to the RS layer on the transmitting side;
  • the RS layer puts the corresponding LLID field of the MAC frame header according to the LLID corresponding to the MAC frame, obtains the current transmission number corresponding to the LLID as the frame sequence number FSN (Frame Sequence Number) of the MAC frame, and then submits the MAC frame through the xMII interface.
  • FSN Frae Sequence Number
  • the MAC frame continues to be processed by the transmitting side PMA layer, the PMD layer, the MDI layer, and transmitted to the receiving side through the media layer;
  • the MAC frame is processed by the receiving side media layer, the MDI layer, the PMD layer, and the PMA layer, and submitted to the receiving side PCS layer;
  • the receiving side PCS layer submits the MAC frame to the receiving side RS layer through the xMII interface;
  • the receiving side RS layer obtains the MAC frame start position by detecting the first, second, third, fourth, and fifth bytes of the MAC header header, that is, 0x55, 0x55, 0xd5, 0x55, 0x55, or any combination thereof.
  • the LLID field of the MAC frame and the frame number field in the frame header respectively obtain the LLID and the frame number. If the acquired frame number is the current receiving number of the LLID, the MAC frame is submitted to the MAC layer, the current receiving number is incremented by 1, and the buffer is added. Forwarding with the same MAC frame as the current receiving number, otherwise it will receive the MAC frame for buffering;
  • the method of transmitting data on multiple channels after fragmentation is adopted, and the method of data fragment transmission is adopted, the efficiency is higher, and the delay is smaller, but the data fragmentation destroys the original MAC frame encapsulation, so Based on the fragmentation, the package is redesigned, involving LLID, slice serial number, slice delimitation and other related content.
  • FIG. 24 is a schematic diagram of processing on the transmitting side of the seventh embodiment of the present invention.
  • FIG. 24 and FIG. 25 are schematic diagrams of processing on the receiving side of the seventh embodiment of the present invention, and FIG.
  • synchronization is used to obtain a slice header, which may be 0x55, 0x55, or 0x55, 0x55, SSD (Start of Segment Delimiter, the fragmentation start delimitation, which can take the value 0xe5 or other values)
  • the LLID field is used to carry the LLID value
  • the FSN domain is used to carry the frame number
  • the CRC is used to check and protect the LLID and FSN.
  • steps 1-4 are processing on the transmitting side, as shown in FIG. 22, and steps 5-7 are processing on the receiving side, as shown in FIG. 23):
  • the MAC layer on the transmitting side forms a MAC frame, and submits the MAC frame to the RS layer on the transmitting side;
  • the RS layer divides the MAC frame according to the minimum transmission time principle of the MAC frame, and allocates each fragment to each channel, and adds synchronization content such as 0x55, 0x55, LLID, FSN, CRC, etc. to each fragment.
  • the FSN is the current transmission number corresponding to the LLID, and then each fragment is submitted to the transmitting side PCS layer through the xMII interface of the respective channel;
  • the MAC frame continues to be processed by the transmitting side PMA layer, the PMD layer, the MDI layer, and transmitted to the receiving side through the media layer;
  • the MAC frame is processed by the receiving side media layer, the MDI layer, the PMD layer, and the PMA layer, and submitted to the receiving side PCS layer;
  • the receiving side PCS layer submits the MAC frame to the receiving side RS layer through the xMII interface;
  • the receiving side RS layer obtains the starting position of the fragment by detecting the synchronization of the fragment header, that is, 0x55, 0x55, and obtains the LLID and the frame number from the LLID field and the frame number field of the fragment respectively, if the obtained frame number is If the LLID corresponds to the current receiving number, the fragment is submitted to the MAC layer, and the current receiving number is incremented by 1, and the fragment with the same receiving number in the buffer is forwarded, otherwise the fragment is received for buffering.
  • Embodiments of the present invention also provide a storage medium.
  • the storage medium may be configured to store program code for performing the following steps:
  • the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • a mobile hard disk e.g., a hard disk
  • magnetic memory e.g., a hard disk
  • the processor adds a frame sequence number and a frame delimitation in the multi-channel passive optical network data packet or the data packet fragment to be sent according to the stored program code in the storage medium, where
  • the frame sequence number is used to indicate the transmission sequence of the multi-channel passive optical network data packet or the data packet fragmentation, and the frame delimitation is used to indicate the frame start of the multi-channel passive optical network data packet;
  • the processor performs transmitting the multi-channel passive optical network data packet according to the stored program code in the storage medium.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the embodiment of the present invention further provides a storage medium, wherein the computer program is configured to execute the frame serial number carrying method of the multi-channel passive optical network according to the embodiment of the present invention.
  • the technical solution of the embodiment of the present invention adds a frame sequence number and/or a frame delimitation in a multi-channel passive optical network data packet or a data packet fragment to be sent, where the frame sequence number is used to indicate that the multi-channel is not a transmission sequence of a source optical network data packet or a data packet fragment, the frame delimitation being used to indicate a frame start of the multi-channel passive optical network data packet or a data packet fragment; and transmitting the multi-channel passive optical
  • the network data packet or the data packet fragmentation by adding the frame sequence number in the NGEPON data packet, and also ensuring the normal function of the NGEPON data packet, solves the technical problem that the NGEPON data packet cannot be recovered in order in the related art, and improves the NGEPON data packet. Processing efficiency.

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Abstract

本发明提供了一种多通道无源光网络的帧序号承载方法、装置及系统、存储介质，其中，该方法包括：在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，帧序号用于标示多通道无源光网络数据包或者数据包分片的发送顺序，帧定界用于标示多通道无源光网络数据包或者数据包分片的帧起始；发送多通道无源光网络数据包或者数据包分片。通过本发明，解决了多通道无源光网络相关技术中在接收侧不能完全恢复多通道无源光网络数据包或者数据包分片顺序的技术问题，提高了多通道无源光网络数据包或者数据包分片的处理效率。

Description

多通道无源光网络的帧序号承载方法、装置及系统、存储介质
相关申请的交叉引用
本申请基于申请号为201611035955.6、申请日为2016年11月09日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及通信领域，具体而言，涉及一种多通道无源光网络的帧序号承载方法、装置及系统、存储介质。
背景技术
IEEE NGEPON(Next Generation EPON，下一代以太无源光网络)/100GEPON(100Gbps EPON，100Gbps以太无源光网络)在标准制定过程中，定义光纤线路终端(Optical Line Terminal，简称为OLT)和光纤网络单元(Optical Network Unit，简称为ONU)之间可以通过多个通道进行数据传输，由于多个通道采用不同波长，NGEPON数据包在这些通道上的传输延迟可能不一样，因此在多个通道上传输的NGEPON数据包到达接收端的顺序与离开发送端的顺序可能不一样，接收端需要解决NGEPON数据包的顺序恢复问题。目前提出的方法是以NGEPON数据包到达接收端的先后次序来判断NGEPON数据包的先后顺序，即先到达接收端的NGEPON数据包在前，后到达接收端的NGEPON数据包在后。但是由于多个通道上的传输延迟不一样，NGEPON数据包到达接收端的顺序并不能正确反映离开发送端的顺序，因此，通过这种方法实现接收侧NGEPON数据包的顺序恢复，还需要考虑很多补偿技术，比较复杂，而且可行性还需进一步论证。
为数据包定义序号是顺序恢复较常用的方法，但是作为定义NGEPON帧结构的基础，以太网帧结构以及以以太网帧结构定义的EPON帧结构、10GEPON帧结构都未定义序号，而且从下面的分析可以看出，在现有的以太网、EPON、10GEPON帧结构的基础上定义NGEPON序号，都会影响现有的功能，要实现保持现有功能又承载帧序号，有较大难度。
由于EPON、10GEPON在以太网帧结构基础上进行重定义，NGEPON将继续结合以太网、EPON、10GEPON帧结构的基础上进行进一步地重定义。
图1为本发明相关技术中的以太网帧结构示意图，preamble为前导，SFD为帧定界起始start of frame delimiter，destination address为目标地址，source address为源地址，Length/Type域为净荷长度或者帧类型，Frame Check Sequence为帧校验序列。
如表1所示，为以太网帧头(包括preamble和SFD)的定义。在以太网数据传输过程中，接收端一般需要通过检测preamble和SFD来确定帧起始。
表1
Figure PCTCN2017110282-appb-000001
EPON/10GEPON帧结构在以太网帧结构基础上进行重定义。图2为本发明相关技术中的EPON/10GEPON帧结构示意图，在以太网帧结构基础上进行重新定义，preamble为前导，DA为目标地址(destination address)，SA为源地址(source address)，Len/Type域为净荷长度或者帧类型，FCS 为帧校验序列(Frame Check Sequence)。
EPON、10GEPON帧头定义如表2所示，修改包括：第3个字节改为SLD(Start of LLID delimiter，LLID起始定界)，取值0xd5，用于识别LLID的起始位置，第6、7字节重定义为LLID(Logical Link ID，逻辑链路标识)，第8字节重定义为CRC，对第3-7字节进行校验。
表2
字节 含义 取值
1 - 0x55
2 - 0x55
3 SLD 0xd5
4 - 0x55
5 - 0x55
6 LLID[15:8] <mode,logical_link_id[14:8]>
7 LLID[7:0] <logical_link_id[7:0]>
8 CRC8 针对字节3-7字节计算的CRC8值
在特定速率条件下，例如1Gbps的EPON，帧结构之前还有一个SPD为包起始定界(start of packet delimiter)，图3是本发明相关技术中带SPD的EPON帧结构示意图，所示。在发送侧的处理中，SPD的发送可能会覆盖preamble中的若干字节。因此在以太无源光网络中，帧头中只有第3、4、5字节的0xd5、0x55、0x55可以可靠地用于帧头检测。
图4是本发明相关技术中SPD替代preamble首部字节的示意图，图4包括两种情况，PCS层会插入SPD并替代preamble首部的字节。当SPD处于even clock位置时，替代preamble中的第一个字节0x55，而当SPD处于odd clock位置时，preamble首部的两个字节都会被替换成一个SPD。
从以上EPON、10GEPON帧结构定义看，并没有帧序号的承载。从EPON、10GEPON帧结构从以太网帧结构的修改来看，虽然为了实现数据顺序的恢复，在EPON、10GEPON帧头携带帧序号是较好的方法，但是第1、2字节在传输过程中可能会被替换成其他内容(例如替换成SPD的部分内容)，不能用来可靠地承载帧序号，第4、5字节可以用来承载帧序号， 但是在去掉第4、5字节后帧识别只能依靠第3字节的0xd5，识别准确率将大幅降低。
针对相关技术中存在的上述问题，目前尚未发现有效的解决方案。
发明内容
本发明实施例提供了一种多通道无源光网络的帧序号承载方法、装置及系统、存储介质，以至少解决了相关技术中不能按顺序恢复以太无源光网络数据包的技术问题。
根据本发明的一个实施例，提供了一种多通道无源光网络的帧序号承载方法，包括：在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，所述帧序号用于标示所述多通道无源光网络数据包或者数据包分片的发送顺序，所述帧定界用于标示所述多通道无源光网络数据包或者数据包分片的帧起始；
发送所述多通道无源光网络数据包或者数据包分片。
在一实施方式中，在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号包括以下至少之一：在待发送的多通道无源光网络数据包或者数据包分片的头部添加所述帧序号；在待发送的多通道无源光网络数据包之外增加一层包装，在增加的包装内添加所述帧序号；在将待发送的多通道无源光网络数据包进行分片后，在数据包分片之外增加一层包装，在增加的包装内添加帧序号。
在一实施方式中，在待发送的多通道无源光网络数据包或者数据包分片中添加帧定界包括：重用待发送的多通道无源光网络数据包或者数据包分片的帧定界；在待发送的多通道无源光网络数据包或者数据包分片的头部添加所述帧定界；在待发送的多通道无源光网络数据包之外增加一层包装，在增加的包装内添加所述帧定界；在将待发送的多通道无源光网络数据包进行分片后，在数据包分片之外增加一层包装，在增加的包装内添加 帧定界。
根据本发明的一个实施例，提供了另一种以太无源光网络的帧序号承载方法，包括：接收多通道无源光网络数据包或者数据包分片；解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧定界和帧序号；根据所述帧定界和所述帧序号分别确定所述多通道无源光网络数据包或者数据包分片的帧起始、发送端在发送所述多通道无源光网络数据包或者数据包分片时的顺序。
在一实施方式中，解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧定界包括：在物理编码层PCS层恢复所述多通道无源光网络数据包或者数据包分片的的前m个字节，其中，所述m个字节用于检测所述多通道无源光网络数据包或者数据包分片的起始位置；将所述多通道无源光网络数据包或者数据包分片提交给MAC层，MAC层通过检测所述多通道无源光网络数据包或者数据包分片头部前n个字节得到多通道无源光网络数据包或者数据包分片的头部，并获取所述帧定界；其中，m、n分别为正整数。
在一实施方式中，解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧定界包括：在所述多通道无源光网络数据包或者数据包分片的头部解析出所述帧定界。
在一实施方式中，解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧序号包括：在PCS层获取帧序号；在向MAC层提交多通道无源光网络数据包或者数据包分片同时，将所述帧序号通过原语提交给所述MAC层，并在MAC层中得到所述多通道无源光网络数据包或者数据包分片及对应的帧序号。
在一实施方式中，解析所述多通道无源光网络数据包或者数据包分片 得到承载在所述多通道无源光网络数据包或者数据包分片中的帧序号包括：在所述多通道无源光网络数据包或者数据包分片的头部解析出所述帧序号。
在一实施方式中，在根据所述帧定界和所述帧序号分别确定所述多通道无源光网络数据包或者数据包分片的帧起始和发送端在发送所述多通道无源光网络数据包或者数据包分片时的顺序之后，所述方法还包括：通过恢复和/或获取帧定界，通过帧定界获得多通道无源光网络数据包或者数据包分片的起始，并获取帧序号，恢复多通道无源光网络数据包或者数据包分片的顺序。
根据本发明的另一个实施例，提供了一种以太无源光网络的帧序号承载装置，包括：添加模块，配置为在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，所述帧序号用于标示所述多通道无源光网络数据包或者数据包分片的发送顺序，所述帧定界用于标示所述多通道无源光网络数据包的帧起始；发送模块，配置为发送所述多通道无源光网络数据包或数据包分片。
在一实施方式中，所述添加模块包括：第一添加单元，配置为在待发送的多通道无源光网络数据包或者数据包分片的头部添加所述帧序号；第二添加单元，配置为在待发送的多通道无源光网络数据包之外增加一层包装，在增加的包装内添加所述帧序号；第三添加单元，配置为在将待发送的多通道无源光网络数据包进行分片后，在数据包分片之外增加一层包装，在增加的包装内添加帧序号。
在一实施方式中，所述添加模块包括：第四添加单元，配置为重用待发送的多通道无源光网络数据包或者数据包分片的帧定界；第五添加单元，配置为在待发送的多通道无源光网络数据包或者数据包分片的头部添加所述帧定界；第六添加单元，配置为在待发送的多通道无源光网络数据包之 外增加一层包装，在增加的包装内添加所述帧定界；第七添加单元，配置为在将待发送的多通道无源光网络数据包进行分片后，在数据包分片之外增加一层包装，在增加的包装内添加帧定界。
根据本发明的另一个实施例，提供了另一种以太无源光网络的帧序号承载装置，包括：接收模块，配置为接收多通道无源光网络数据包或者数据包分片；解析模块，配置为解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧定界和帧序号；确定模块，配置为根据所述帧定界和所述帧序号分别确定所述多通道无源光网络数据包的帧起始和发送端在发送所述多通道无源光网络数据包时的顺序。
在一实施方式中，所述装置还包括：获取模块，配置为在所述确定模块根据所述帧定界、所述帧序号分别确定所述多通道无源光网络数据包的帧起始和发送端在发送所述多通道无源光网络数据包时的顺序之后，通过所述帧定界获得所述多通道无源光网络数据包或者数据包分片的起始；恢复模块，配置为通过所述帧序号恢复多通道无源光网络数据包或者数据包分片的顺序。
在一实施方式中，所述解析模块包括：恢复单元，配置为在物理编码层PCS层恢复所述多通道无源光网络数据包或者数据包分片的的前m个字节，其中，所述m个字节用于检测所述多通道无源光网络数据包或者数据包分片的起始位置；提交单元，配置为将所述多通道无源光网络数据包或者数据包分片提交给MAC层，MAC层通过检测所述多通道无源光网络数据包或者数据包分片头部前n个字节得到多通道无源光网络数据包或者数据包分片的头部，并获取所述帧定界；其中，m、n分别为正整数。
在一实施方式中，所述解析模块包括：获取单元，配置为在PCS层获取帧序号；处理单元，配置为在向MAC层提交多通道无源光网络数据包或 者数据包分片同时，将所述帧序号通过原语提交给所述MAC层，并在MAC层中得到所述多通道无源光网络数据包或者数据包分片及对应的帧序号。
根据本发明的又一个实施例，提供了一种以太无源光网络的帧序号承载系统，包括发送端、接收端，所述发送端包括：添加模块，配置为在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，所述帧序号用于标示所述多通道无源光网络数据包或者数据包分片的发送顺序，所述帧定界用于标示所述多通道无源光网络数据包或者数据包分片的帧起始；发送模块，配置为发送所述多通道无源光网络数据包或数据包分片；所述接收端包括：接收模块，配置为接收多通道无源光网络数据包或者数据包分片；解析模块，配置为解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧定界和/或帧序号；确定模块，配置为根据所述帧定界和所述帧序号分别确定所述多通道无源光网络数据包的帧起始和发送端在发送所述多通道无源光网络数据包时的顺序。
根据本发明的又一个实施例，还提供了一种存储介质，该存储介质设置为存储用于执行以下步骤的程序代码：
在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，所述帧序号用于标示所述多通道无源光网络数据包或者数据包分片的发送顺序，所述帧定界用于标示所述多通道无源光网络数据包或者数据包分片的帧起始；
发送所述多通道无源光网络数据包或者数据包分片。
本发明实施例的技术方案，在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，所述帧序号用于标示所述多通道无源光网络数据包或者数据包分片的发送顺序，所述帧定界用于标示所述多通道无源光网络数据包或者数据包分片的帧起始；发送所述多通道 无源光网络数据包或者数据包分片，通过在NGEPON数据包中添加帧序号，同时还保证了NGEPON数据包正常功能，解决了相关技术中不能按顺序恢复NGEPON数据包的技术问题，提高了NGEPON数据包的处理效率。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1为本发明相关技术中的以太网帧结构示意图；
图2为本发明相关技术中的EPON/10GEPON帧结构示意图；
图3是本发明相关技术中带SPD的EPON帧结构示意图；
图4是本发明相关技术中SPD替代preamble首部字节的示意图；
图5是根据本发明实施例的一种多通道无源光网络的帧序号承载方法的流程图；
图6是本发明实施例的EPON协议分层模型示意图；
图7是根据本发明实施例的另一种多通道无源光网络的帧序号承载方法的流程图；
图8是根据本发明实施例的一种多通道无源光网络的帧序号承载装置的结构框图；
图9是根据本发明实施例的另一种多通道无源光网络的帧序号承载装置的结构框图；
图10是本发明实施例中MAC层和PCS层的关系示意图；
图11是本发明具体实施例一中发送侧处理示意图一；
图12是本发明具体实施例一中接收侧处理示意图一；
图13是本发明具体实施例发送侧处理示意图二；
图14是本发明具体实施例接收侧处理示意图二；
图15是本发明具体实施例二中接收侧处理示意图；
图16是发明具体实施例二接收侧处理示意图；
图17是本发明具体实施例三发送侧处理示意图；
图18是本发明具体实施例三接收侧处理示意图；
图19是本发明具体实施例四接收侧处理示意图；
图20是本发明具体实施例五发送侧处理示意图；
图21是本发明具体实施例五接收侧处理示意图；
图22是本发明具体实施例六发送侧处理示意图；
图23是本发明具体实施例六接收侧处理示意图；
图24是本发明具体实施例七发送侧处理示意图；
图25是本发明具体实施例七接收侧处理示意图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。
实施例1
在本实施例中提供了一种多通道无源光网络的帧序号承载方法，图5是根据本发明实施例的一种多通道无源光网络的帧序号承载方法的流程图，如图5所示，该流程包括如下步骤：
步骤S502，在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，帧序号用于标示多通道无源光网络数据包或者数据包分片的发送顺序，帧定界用于标示多通道无源光网络数据包或者数据包分片的帧起始；
步骤S504，发送多通道无源光网络数据包或者数据包分片。
通过上述步骤，在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和帧定界，其中，帧序号用于标示多通道无源光网络数据包或者数据包分片的发送顺序，帧定界用于标示多通道无源光网络数据包或者数据包分片的帧起始；发送多通道无源光网络数据包或者数据包分片，通过在多通道无源光网络数据包或者数据包分片中添加帧序号，由于在多通道无源光网络数据包或者数据包分片中携带帧序号可能破坏了帧起始的检测，因此，还要在接收端通过MAC层和其他层配合恢复帧起始的检测，以获得帧序号，同时还保证了多通道无源光网络数据包或者数据包分片的正常功能，解决了相关技术中不能按顺序恢复多通道无源光网络数据包的技术问题，提高了多通道无源光网络数据包的处理效率。
在一实施方式中，上述步骤的执行主体可以为OLT、ONU等，但不限于此。
本实施例的方案还涉及两个方面，一方面是以太无源光网络的协议分层结构，另一方面是帧序号的编号空间。图6是本发明实施例的EPON协议分层模型示意图，以太无源光网络协议分层结构见图6：
其中三个重要的层为PCS层、RS层和MAC层。
PCS(Physical coding sublayer，物理编码)层，功能包括，将数据比特编码成能在物理媒介上传输的码组。
RS(Reconciliation sublayer)层，为xMII层信号和MAC层服务之间提供匹配。
MAC(Media access control，媒介访问控制)层，定义独立于媒介的功能，包括想物理层发送数据和从物理层接收数据。总体来说，MAC层定义数据封装(如成帧，寻址，错误检测)和媒介访问(如冲突检测，错误处理)。
本发明的实施例中涉及MAC帧相关处理涉及的层次，这仅仅是本发明提供的优选方案，在不违反相关处理原则和/或顺序的情况下，这些相关处理可以在其他层次实施，因此也在本发明保护的范围中。
帧序号一般都有一个范围，本发明以FSN(Frame Sequence Number)域为2字节为例，但并不限制FSN采用其他取值范围，其他取值范围可以轻易地从本发明推导出来，也在本发明保护范围内。
多通道以太网无源光网络MAC帧承载帧序号的方式，可以按照后续具体实施例完成。
FSN从0开始编号，每发送一个多通道以太网无源光网络MAC帧，FSN加1，到最大值65535后，若再发送一个多通道以太网无源光网络MAC帧，则FSN回到0，从接收端看，当收到FSN为65535的多通道以太网无源光网络MAC帧后，下一个多通道以太网无源光网络MAC帧的FSN应该为0。
OLT针对每一个ONU的每一个LLID发送多通道以太网无源光网络MAC帧时，保持一个独立的FSN编号空间，不同的LLID有不同的FSN编号空间，每个ONU被分配不同的LLID，在多通道以太网无源光网络MAC中携带不同ONU的不同LLID，就形成互相独立的FSN编号空间，ONU在接收多通道以太网无源光网络MAC帧时，通过MAC帧中的LLID域判断是不是发给自己的，通过LLID对多通道以太网无源光网络MAC进行过滤后，再根据FSN对多通道以太网无源光网络MAC帧进行顺序回复。OLT给一个ONU发送多通道以太网无源光网络MAC帧时，在进入绑定通道前，顺序已经按照下述实施例或其他方法填写了FSN域，携带FSN域的多通道以太网无源光网络MAC帧按照一定方式(round robin，发送时间最早，等等)进入绑定的多个通道进行发送。ONU侧按照下述实施例或者其他方法进行接收处理，RS层或者MAC层对接收到的多通道以太网无源光网络 MAC帧进行一定程度的缓存，并对接收到的多通道以太网无源光网络MAC帧根据FSN域进行顺序恢复。
对于单通道情况，由于多通道以太网无源光网络MAC帧不会出现乱序情况，FSN可以不需要，如果保留FSN在接收端仅是个冗余信息。
因此，OLT在发送多通道以太网无源光网络MAC帧时，可以不区分是否通道绑定，直接增加FSN域；也可以先判断目标ONU是否通道绑定，是通道绑定才增加FSN域。接收侧不管发送侧的处理情况，按照下述实施例的方式统一处理。
ONU给OLT发送多通道以太网无源光网络MAC帧，针对每一个LLID保持一个独立的FSN编号空间，发送与下行一样。接收侧，OLT需要根据ONU的LLID或者MAC地址来区分多通道以太网无源光网络MAC来自哪个ONU，并建立相应的FSN编号空间判断域。
编号空间：
发送侧针对每个LLID维护一个当前发送编号，当前发送编号每被获取一次，将在下次被获取之前加一，如果当前发送编号大于最大值，则设置为最小值。
接收侧针对每个LLID维护一个当前接收编号，当前接收编号每确认一次，将自动加1，如果当前接收编号大于最大值，则设置为最小值。
本发明中所采取的步骤以及采取步骤所在侧层次，都是本发明的优选实施例，其他可实现的组合都在本发明保护范围内。
在本实施例中，在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号包括以下几种场景：
在待发送的多通道无源光网络数据包或者数据包分片的头部添加帧序号；
在待发送的多通道无源光网络数据包或者数据包分片之外增加一层包 装，在增加的包装内添加帧序号；
在将待发送的多通道无源光网络数据包进行分片后，在数据包分片之外增加一层包装，在增加的包装内添加帧序号。
在本实施例中，头部(前导部分)包括8个字节，帧序号承载在前导部分的第4和第5字节。
在本实施例中，帧序号的编号范围为0至65535，其中，每个编号对应一个多通道无源光网络数据包的帧序号。
在本实施例中，在待发送的多通道无源光网络数据包或者数据包分片中添加帧定界包括以下几种场景：
重用待发送的多通道无源光网络数据包或者数据包分片的帧定界；
在待发送的多通道无源光网络数据包或者数据包分片的头部添加帧定界；
在待发送的多通道无源光网络数据包之外增加一层包装，在增加的包装内添加帧定界；
在将待发送的多通道无源光网络数据包进行分片后，在数据包分片之外增加一层包装，在增加的包装内添加帧定界。
在本实施例中提供了一种多通道无源光网络的帧序号承载的接收方法，与图5所示的方案对应，图7是根据本发明实施例的一种多通道无源光网络的帧序号承载的接收方法的流程图，如图7所示，该流程包括如下步骤：
步骤S702，接收多通道无源光网络数据包或者数据包分片；
步骤S704，解析多通道无源光网络数据包或者数据包分片得到承载在多通道无源光网络数据包或者数据包分片中的帧定界和帧序号；
步骤S706，根据帧定界和帧序号分别确定多通道无源光网络数据包或者数据包分片的帧起始和发送端在发送多通道无源光网络数据包或者数据 包分片时的顺序。
在一实施方式中，在根据帧定界和帧序号分别确定多通道无源光网络数据包的帧起始和发送端在发送多通道无源光网络数据包时的顺序之后，方法还包括：通过恢复和/或获取帧定界，通过帧定界获得多通道无源光网络数据包或者数据包分片的起始，并进一步获取帧序号，并恢复多通道无源光网络数据包或者数据包分片的顺序。
在根据本实施例的可选实施方式中，在重用待发送的多通道无源光网络数据包或者数据包分片的帧定界时，解析多通道无源光网络数据包得到承载在多通道无源光网络数据包或者数据包分片中的帧定界包括：
S11，在物理编码层PCS层恢复多通道无源光网络数据包或者数据包分片的的前m个字节，其中，m个字节用于检测多通道无源光网络数据包或者数据包分片的起始位置；
S12，将多通道无源光网络数据包或者数据包分片提交给MAC层，MAC层通过检测多通道无源光网络数据包或者数据包分片头部前n个字节得到多通道无源光网络数据包或者数据包分片的头部，并获取帧定界；其中，m、n分别为正整数。具体的，m为2，和/或，n为3。
在一实施方式中，在未重用待发送的多通道无源光网络数据包或者数据包分片的帧定界时，解析多通道无源光网络数据包或者数据包分片得到承载在多通道无源光网络数据包或者数据包分片中的帧定界包括：在多通道无源光网络数据包或者数据包分片的头部解析出帧定界。
在根据本实施例的另一个可选实施方式中，解析多通道无源光网络数据包或者数据包分片得到承载在多通道无源光网络数据包或者数据包分片中的帧序号包括：
S21，在PCS层获取帧序号；
S22，在向MAC层提交多通道无源光网络数据包或者数据包分片同时， 将帧序号通过原语提交给MAC层，并在MAC层中得到多通道无源光网络数据包或者数据包分片以及相应的帧序号。
在一实施方式中，解析多通道无源光网络数据包或者数据包分片得到承载在多通道无源光网络数据包或者数据包分片中的帧序号包括：在多通道无源光网络数据包或者数据包分片的头部解析出帧序号。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到根据上述实施例的方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，或者网络设备等)执行本发明各个实施例的方法。
实施例2
在本实施例中还提供了一种多通道无源光网络的帧序号承载装置、系统，配置为实现上述实施例及优选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图8是根据本发明实施例的一种多通道无源光网络的帧序号承载装置的结构框图，如图8所示，该装置包括：
添加模块80，配置为在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，帧序号用于标示多通道无源光网络数据包或者数据包分片的发送顺序，帧定界用于标示多通道无源光网络数据包或者数据包分片的帧起始；
发送模块82，配置为发送多通道无源光网络数据包或者数据包分片。
在一实施方式中，添加模块还包括：第一添加单元，配置为在待发送的多通道无源光网络数据包或者数据包分片头部添加帧序号；第二添加单元，配置为在待发送的多通道无源光网络数据包或者数据包分片之外增加一层包装，在增加的包装内添加帧序号；第三添加单元，配置为在将待发送的多通道无源光网络数据包进行分片后，在数据包分片之外增加一层包装，在增加的包装内添加帧序号。
在一实施方式中，头部(前导部分)包括8个字节，帧序号承载在前导部分的第4和第5字节。
在一实施方式中，添加模块包括：第四添加单元，配置为重用待发送的多通道无源光网络数据包或者数据包分片的帧定界；第五添加单元，配置为在待发送的多通道无源光网络数据包或者数据包分片的头部添加帧定界；第六添加单元，配置为在待发送的多通道无源光网络数据包之外增加一层包装，在增加的包装内添加帧定界；第七添加单元，配置为在将待发送的多通道无源光网络数据包进行分片后，在数据包分片之外增加一层包装，在增加的包装内添加帧定界。
图9是根据本发明实施例的另一种多通道无源光网络的帧序号承载装置的结构框图，如图9所示，包括：
接收模块90，配置为接收多通道无源光网络数据包或者数据包分片；
解析模块92，配置为解析多通道无源光网络数据包得到承载在多通道无源光网络数据包或者数据包分片中的帧序号和帧定界；
确定模块94，配置为根据帧定界和帧序号分别确定多通道无源光网络数据包的帧起始和发送端在发送多通道无源光网络数据包时的顺序。
在一实施方式中，装置还包括：获取模块，配置为在确定模块根据帧定界和帧序号分别确定多通道无源光网络数据包的帧起始和发送端在发送 多通道无源光网络数据包时的顺序之后，通过帧定界获得多通道无源光网络数据包或者数据包分片的起始；恢复模块，配置为通过帧序号恢复多通道无源光网络数据包或者数据包分片的顺序。
在一实施方式中，解析模块包括：恢复单元，配置为在物理编码层PCS层恢复多通道无源光网络数据包或者数据包分片的前m个字节，其中，m个字节用于检测多通道无源光网络数据包或者数据包分片的起始位置；提交单元，配置为将多通道无源光网络数据包或者数据包分片提交给MAC层，MAC层通过检测多通道无源光网络数据包的头部或者前导部分首部的n个字节得到帧序号；其中，m、n分别为正整数。解析模块包括：获取单元，配置为在PCS层获取帧序号；处理单元，配置为在向MAC层提交多通道无源光网络数据包或者数据包分片同时，将帧序号通过原语提交给MAC层，并在MAC层中得到多通道无源光网络数据包或者数据包分片及对应的帧序号。
本实施例还提供了一种多通道无源光网络的帧序号承载系统，包括发送端、接收端，发送端包括：添加模块，配置为在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和帧定界，其中，帧序号用于标示多通道无源光网络数据包或者数据包分片的发送顺序，帧定界用于标示多通道无源光网络数据包或者数据包分片的帧起始；发送模块，配置为发送多通道无源光网络数据包或者数据包分片；接收端包括：接收模块，配置为接收多通道无源光网络数据包或者数据包分片；解析模块，配置为解析多通道无源光网络数据包或者数据包分片得到承载在多通道无源光网络数据包或者数据包分片中的帧序号和帧定界；确定模块，配置为根据帧定界和帧序号分别确定多通道无源光网络数据包的帧起始和发送端在发送多通道无源光网络数据包时的顺序。
需要说明的是，上述各个模块是可以通过软件或硬件来实现的，对于 后者，可以通过以下方式实现，但不限于此：上述模块均位于同一处理器中；或者，上述各个模块以任意组合的形式分别位于不同的处理器中。
实施例3种多通道以太无源光网络系统中既能实现帧序号携带又能保证接收端正确识别帧起始的数据传输方法，不但可以应用于NGEPON，也可以应用于EPON/10GEPON，也可以应用于其他无源光网络系统。本实施例提供一种帧序号携带又能保证接收端
本发明提供一正确识别帧起始的数据传输方法。图10是本发明实施例中MAC层和PCS层的关系示意图，如图10所示，和图6相同，其中两个重要的层为PCS层和MAC层。PCS(Physical coding sublayer，物理编码层)，功能包括，将数据比特编码成能在物理媒介上传输的码组。MAC(Media access control，媒介访问控制)层，定义独立与媒介的功能，包括向物理层发送数据和从物理层接收数据。总体来说，MAC层定义数据封装(如成帧，寻址，错误检测)和媒介访问(如冲突检测，错误处理)。
本实施例通过在多通道无源光网络数据包或者数据包分片中携带帧序号，以标示以太无源光网络数据包或者数据包分片发送的先后顺序。由于在多通道无源光网络数据包或者数据包分片中携带帧序号破坏了帧起始的检测，因此，还要在接收端通过MAC层和其他层配合恢复帧起始的检测，以及获得帧序号。接收端根据帧序号判断多通道无源光网络数据包或者数据包分片的先后顺序，即使多通道无源光网络数据包或者数据包分片在传输中发生接收顺序错乱，接收端可以根据多通道无源光网络数据包或帧数据包分片中的帧序号，以恢复多通道无源光网络数据包或者数据包分片的传输顺序。
通过本实施例，在原有的多通道无源光网络帧结构基础上，增加了帧序号的携带，同时还保证了帧起始的检测。
下面结合具体实施例进行详细说明：
具体实施例一
帧序号承载方法一
将Preamble第4、5字节用来承载NGEPON MAC帧序号，在接收端PCS层恢复第1、2字节的0x55、0x55用于检测MAC帧的起始。
本实施例中，将preamble中的第4、5个字节用于承载以太网帧序号，为了保持接收侧检测以太网起始的成功率，接收侧的PCS层在检测到SPD后，恢复出preamble首部的两个字节0x55、0x55，再将MAC帧提交给MAC层，MAC层通过检测preamble首部第1、2、3字节中的0x55、0x55、0xd5来检测以太网帧起始位置。
图11是本发明具体实施例一中发送侧处理示意图一，图11为以太无源光网络数据包发送过程示意图，在MAC成帧过程中，将帧序号FSN(Frame Sequence Number)，放入SLD后的两个字节中，以太无源光网络数据包经过RS层、xMII层处理后进入PCS层，PCS层的处理不改变，在插入一定数量的Idle后，再插入SPD，替换以太无源光网络数据包帧头的0x55字节，在通过PMA、PMD、MDI层处理后进行发送。
图12是本发明具体实施例一中接收侧处理示意图一，图12为接收侧处理示意图，PCS层检测到SPD后，替换成0x55，将MAC帧提交给MAC层，MAC层通过检测0x55/0x55/0xd5序列获得帧起始，再获得帧序号FSN，用来恢复以太无源光网络数据包顺序。
在本实施例中，将MAC帧头中的第4、5字节作为帧序号域，用来承载帧序号，考虑到发送侧PCS层在插入SPD时可能会覆盖MAC帧头的第1字节或者第1、2字节，为了保持接收侧能够检测到MAC帧起始，因此接收侧PCS层将恢复MAC帧的第1字节(0x55)或者第1、2字节(0x55、0x55)，以用于接收侧检测帧起始。
图13是本发明具体实施例发送侧处理示意图二，示例覆盖一个0x55 的情况，图14是本发明具体实施例接收侧处理示意图二，示例覆盖一个0x55的情况，本实施例的具体步骤包括(其中步骤1-4为发送侧的处理，如图13所示所示，步骤5-7为接收侧的处理，如图14所示)：
1、发送侧MAC层形成MAC帧，并将MAC帧提交给发送侧RS层；
2、RS层根据MAC帧对应的LLID，获取LLID对应的当前发送编号作为该MAC帧的帧序号FSN，并将LLID放入MAC帧头的LLID域，将帧序号放入MAC帧头中的帧序号域即第4、5个字节，然后将MAC帧通过xMII接口提交给发送侧PCS层；
3、发送侧PCS层对MAC进行相应处理后，向PMA层提交MAC帧时插入SPD，根据发送时钟情况MAC帧的第1字节或者第1、2字节被覆盖；
4、MAC帧继续通过发送侧PMA层、PMD层、MDI层处理以及通过媒介层传输到接收侧；
5、MAC帧通过接收侧媒介层、MDI层、PMD层、PMA层处理，提交给接收侧PCS层；
6、接收侧PCS层在检测到SPD后，判断下一个字节是0x55还是0xd5，如果是0x55，则在SPD之后插入一个0x55，恢复出MAC帧头首部的一个字节0x55，如果是0xd5，则在SPD之后插入2个0x55，恢复出MAC帧头首部的两个字节0x55、0x55，再将MAC帧通过xMII接口提交给接收侧RS层；
7、接收侧RS层通过检测MAC帧头首部的第1、2、3字节，即0x55、0x55、0xd5，来获取MAC帧起始位置，从MAC帧的帧头中LLID域和帧序号域分别获得LLID和帧序号，如果所获取帧序号是LLID对应当前接收编号，则将该MAC帧提交给MAC层，当前接收编号加1，并将缓存中与当前接收编号相同的MAC帧进行转发，否则将接收到MAC帧进行缓存；
具体实施例二
帧序号承载方法二
将Preamble第4、5字节用来承载NGEPON MAC帧序号，在接收端PCS层获取FSN域，在向MAC层提交MAC帧同时，将FSN域通过原语提交给MAC层。
直接把preamble的第4和5字节承载帧序号FSN，为了接收侧MAC层能够检测以太网起始位置，接收侧PCS层检测到SPD后可以获得以太网帧起始位置，获取帧序号后将第4、5字节替换为0x55，0x55，并将帧序号通过原语提交给MAC层。
发送侧处理与图11一样。
图15是本发明具体实施例二中接收侧处理示意图，PCS层检测到SPD后，提取FSN域，保存FSN并将FSN域替换成0x55、0x55，将MAC帧提交给MAC层，并将FSN通过原语也提交给MAC层，MAC层检测0xd5/0x55/0x55序列获得帧起始，通过原语获得帧序号FSN，用来恢复NGEPON MAC帧顺序。
在本实施例中，将MAC帧头中的第4、5字节作为帧序号域，用来承载帧序号，考虑到发送侧PCS层在插入SPD时可能会覆盖MAC帧头的第1字节或者第1、2字节，为了保持接收侧能够检测到MAC帧起始，因此在接收侧PCS层获取FSN域，并将MAC帧中的FSN域替换成0x55、0x55，MAC帧头的第3、4、5字节的0xd5、0x55、0x55用于检测MAC帧起始，接收侧PCS层在向接收侧RS层提交MAC帧的同时，将获取的FSN域值通过原语提交给接收侧RS层。
本实施例的具体步骤包括，其中步骤1-4为发送侧的处理，如图13所示，步骤5-7为接收侧的处理，图16是发明具体实施例二接收侧处理示意图，示例覆盖一个0x55的情况，如图16所示：
1、发送侧MAC层形成MAC帧，并将MAC帧提交给发送侧RS层；
2、RS层根据MAC帧对应的LLID，获取LLID对应的当前发送编号作为该MAC帧的帧序号FSN(Frame Sequence Number)，并将LLID放入MAC帧头的LLID域，将帧序号放入MAC帧头中的帧序号域即第4、5个字节，然后将MAC帧通过xMII接口提交给发送侧PCS层；
3、发送侧PCS层对MAC进行相应处理后，向PMA层提交MAC帧时插入SPD，根据发送时钟情况MAC帧的第1字节或者第1、2字节被覆盖；
4、MAC帧继续通过发送侧PMA层、PMD层、MDI层处理以及通过媒介层传输到接收侧；
5、MAC帧通过接收侧媒介层、MDI层、PMD层、PMA层处理，提交给接收侧PCS层；
6、接收侧PCS层在检测到SPD后，判断下一个字节是0x55还是0xd5，如果是0x55，FSN域在之后的0xd5之后，如果是0xd5，FSN域在则在该0xd5之后。提取FSN域并将FSN域替换为0x55、0x55，再将MAC帧、FSN域值通过xMII接口提交给接收侧RS层；
7、接收侧RS层获得MAC帧和对应的FSN域值，通过检测MAC帧头的0xd5、0x55、0x55序列，来获取MAC帧起始位置，从MAC帧头中LLID域获取LLID，从FSN域值获取帧序号，如果所获取帧序号是LLID对应当前接收编号，则将该MAC帧提交给MAC层，当前接收编号加1，并将缓存中与当前接收编号相同的MAC帧进行转发，否则将接收到MAC帧进行缓存。
具体实施例三
帧序号承载方法三
本实施例在具体实施例一的基础上，考虑发送侧PCS层不会插入SPD 的情况，那么在PCS层中MAC帧头首部的字节不会被替代。
本实施例中，将MAC帧头中的第4、5个字节作为帧序号域，用于承载帧序号，发送侧在MAC帧头的第4、5个字节承载帧序号，接收侧PCS层在检测不到SPD的情况下，直接将帧提交给RS层，接收侧RS层通过检测帧头首部第1、2、3字节中的0x55、0x55、0xd5来检测以太网帧起始位置。
本实施例的具体步骤包括，其中步骤1-4为发送侧的处理，图17是本发明具体实施例三发送侧处理示意图，如图17所示，步骤5-7为接收侧的处理，图18是本发明具体实施例三接收侧处理示意图，如图18所示)：
1、发送侧MAC层形成MAC帧，并将MAC帧提交给发送侧RS层；
2、RS层根据MAC帧对应的LLID，获取LLID对应的当前发送编号作为该MAC帧的帧序号FSN(Frame Sequence Number)，并将LLID放入MAC帧头的LLID域，将帧序号放入MAC帧头中的帧序号域即第4、5个字节，然后将MAC帧通过xMII接口提交给发送侧PCS层；
3、发送侧PCS层对MAC进行相应处理后，向PMA层提交MAC帧；
4、MAC帧继续通过发送侧PMA层、PMD层、MDI层处理以及通过媒介层传输到接收侧；
5、MAC帧通过接收侧媒介层、MDI层、PMD层、PMA层处理，提交给接收侧PCS层；
6、接收侧PCS层将MAC帧通过xMII接口提交给接收侧RS层；
7、接收侧RS层通过检测MAC帧头首部的第1、2、3字节，即0x55、0x55、0xd5，来获取MAC帧起始位置，从MAC帧的帧头中LLID域和帧序号域分别获得LLID和帧序号，如果所获取帧序号是LLID对应当前接收编号，则将该MAC帧提交给MAC层，当前接收编号加1，并将缓存中与当前接收编号相同的MAC帧进行转发，否则将接收到MAC帧进行缓存。
具体实施例四
帧序号承载方法四
本实施例在具体实施例二的基础上，考虑发送侧PCS层不会插入SPD的情况，那么在PCS层中MAC帧头首部的字节不会被替代。
在本实施例中，将MAC帧头中的第4、5字节作为帧序号域，用来承载帧序号，为了保持接收侧能够检测到MAC帧起始，因此在接收侧PCS层获取FSN域，并将MAC帧中的FSN域替换成0x55、0x55，MAC帧头的第1、2、3、4、5字节的0x55、0x55、0xd5、0x55、0x55或者其任意组合用于检测MAC帧起始，接收侧PCS层在向接收侧RS层提交MAC帧的同时，将获取的FSN域值通过原语提交给接收侧RS层。
本实施例的具体步骤包括，其中，步骤1-4为发送侧的处理，如图17所示，步骤5-7为接收侧的处理，图19是本发明具体实施例四接收侧处理示意图，如图19所示：
1、发送侧MAC层形成MAC帧，并将MAC帧提交给发送侧RS层；
2、RS层根据MAC帧对应的LLID，获取LLID对应的当前发送编号作为该MAC帧的帧序号FSN(Frame Sequence Number)，并将LLID放入MAC帧头的LLID域，将帧序号放入MAC帧头中的帧序号域即第4、5个字节，然后将MAC帧通过xMII接口提交给发送侧PCS层；
3、发送侧PCS层对MAC进行相应处理后，向PMA层提交MAC帧；
4、MAC帧继续通过发送侧PMA层、PMD层、MDI层处理以及通过媒介层传输到接收侧；
5、MAC帧通过接收侧媒介层、MDI层、PMD层、PMA层处理，提交给接收侧PCS层；
6、接收侧PCS层通过检测，MAC帧之前的idle或者其他特征内容、或者MAC帧头中的内容，检测到FSN域，提取FSN域并将FSN域替换为 0x55、0x55，再将MAC帧、FSN域值通过xMII接口提交给接收侧RS层；
7、接收侧RS层获得MAC帧和对应的FSN域值，通过检测MAC帧头的0x55、0x55、0xd5、0x55、0x55序列或者其任意组合，来获取MAC帧起始位置，从MAC帧头中LLID域获取LLID，从FSN域值获取帧序号，如果所获取帧序号是LLID对应当前接收编号，则将该MAC帧提交给MAC层，当前接收编号加1，并将缓存中与当前接收编号相同的MAC帧进行转发，否则将接收到MAC帧进行缓存；
具体实施例五
帧序号承载方法五
本实施例中，在MAC帧外增加一层封装，用于携带帧序号及相关信息，包含帧序号、帧序号起始(如0xe5，当然可以使用其他值)、其他起始内容(如两个0x55)。
增加的封装层可以在发送端MAC层增加，那么在发送方和接收方在RS层都不做处理，接收方RS层直接将增加封装层的MAC帧提交给MAC层，接收侧检测0x55、0x55、0xe5字节序列，从而获得增加外层封装后的MAC帧，并进一步解析出后续的LLID和FSN，用以恢复以太无源光网络帧顺序。
本实施例中，在MAC帧外增加一层封装，包括0x55、0x55、0xe5和两个字节的帧序号域，帧序号域用于承载帧序号，发送侧增加的封装中的帧序号域承载帧序号，接收侧PCS层直接将帧提交给RS层，接收侧RS层通过检测帧头首部第1、2、3字节中的0x55、0x55、0xe5来检测MAC帧起始位置。
本实施例的具体步骤包括，其中，步骤1-4为发送侧的处理，图20是本发明具体实施例五发送侧处理示意图，如图20所示，步骤5-7为接收侧的处理，图21是本发明具体实施例五接收侧处理示意图，如图21所示：
1、发送侧MAC层形成MAC帧，并将MAC帧提交给发送侧RS层；
2、RS层根据MAC帧对应的LLID，放入MAC帧头相应的LLID域，获取LLID对应的当前发送编号作为该MAC帧的帧序号FSN(Frame Sequence Number)，在MAC帧外依次增加0x55、0x55、0xe5和FSN，然后将MAC帧通过xMII接口提交给发送侧PCS层；
3、发送侧PCS层对MAC进行相应处理后，向PMA层提交MAC帧；
4、MAC帧继续通过发送侧PMA层、PMD层、MDI层处理以及通过媒介层传输到接收侧；
5、MAC帧通过接收侧媒介层、MDI层、PMD层、PMA层处理，提交给接收侧PCS层；
6、接收侧PCS层将MAC帧通过xMII接口提交给接收侧RS层；
7、接收侧RS层通过检测MAC帧头首部的第1、2、3字节，即0x55、0x55、0xe5，来获取MAC帧起始位置，从MAC帧的帧头中帧序号域和LLID域分别获得LLID和帧序号，如果所获取帧序号是LLID对应当前接收编号，则将该MAC帧提交给MAC层，当前接收编号加1，并将缓存中与当前接收编号相同的MAC帧进行转发，否则将接收到MAC帧进行缓存；
当然，以本实施例为基础，考虑插入SPD的情况，可以采用实施例一的方法进行处理，本实施例不再赘述。
具体实施例六
帧序号承载方法六
本实施例在具体实施例五的基础上，重新定义MAC帧头，在LLID之后增加帧序号，并且用CRC区域对LLID、帧序号域进行保护。
本实施例中，重新设计MAC帧帧头，在原有MAC帧头的LLID域后面增加2字节的FSN域，用于携带帧序号，CRC对SLD、LLID、FSN进行校验保护。
本实施例中，LLID、FSN在发送侧RS层增加，接收侧检测0x55、0x55、0xd5、0x55、0x55字节序列或者其任意组合，从而获得MAC帧头，并进一步解析出后续的LLID和FSN，用以恢复以太无源光网络帧顺序。
本实施例的具体步骤包括，其中步骤1-4为发送侧的处理，图5具体实施例六发送侧处理示意图，如图22所示，步骤5-7为接收侧的处理，图23是本发明具体实施例六接收侧处理示意图，如图23所示：
1、发送侧MAC层形成MAC帧，并将MAC帧提交给发送侧RS层；
2、RS层根据MAC帧对应的LLID，放入MAC帧头相应的LLID域，获取LLID对应的当前发送编号作为该MAC帧的帧序号FSN(Frame Sequence Number)，然后将MAC帧通过xMII接口提交给发送侧PCS层；
3、发送侧PCS层对MAC进行相应处理后，向PMA层提交MAC帧；
4、MAC帧继续通过发送侧PMA层、PMD层、MDI层处理以及通过媒介层传输到接收侧；
5、MAC帧通过接收侧媒介层、MDI层、PMD层、PMA层处理，提交给接收侧PCS层；
6、接收侧PCS层将MAC帧通过xMII接口提交给接收侧RS层；
7、接收侧RS层通过检测MAC帧头首部的第1、2、3、4、5字节，即0x55、0x55、0xd5、0x55、0x55或者其任意组合，来获取MAC帧起始位置，从MAC帧的LLID域和帧头中帧序号域分别获得LLID和帧序号，如果所获取帧序号是LLID对应当前接收编号，则将该MAC帧提交给MAC层，当前接收编号加1，并将缓存中与当前接收编号相同的MAC帧进行转发，否则将接收到MAC帧进行缓存；
当然，以本实施例为基础，考虑插入SPD的情况，可以采用实施例一的方法进行处理，本实施例不再赘述。
具体实施例七
帧序号承载方法七
本实施例采用数据进行分片后在多通道上发送的方式，采用数据分片发送的方式，效率更高，延迟更小，但是数据分片破坏了原有的MAC帧封装，因此还要在分片的基础上重新设计封装，涉及LLID、分片序号、分片定界等相关内容。
本实施例中，数据进行分片后在多通道上发送，并为分片重新设计分片头，包括同步、LLID、FSN、CRC等域，图24是本发明具体实施例七发送侧处理示意图，图24、图25是本发明具体实施例七接收侧处理示意图，图25中包含一种具体实现方式，其中同步用于获得分片头，可以是0x55、0x55，或者0x55、0x55、SSD(Start of Segment Delimiter，分片起始定界，可以取值0xe5或者其他值)，LLID域用于携带LLID值，FSN域用于携带帧序号，CRC对LLID、FSN等进行校验保护。
本实施例的具体步骤包括(其中步骤1-4为发送侧的处理，如图22所示，步骤5-7为接收侧的处理，如图23所示)：
1、发送侧MAC层形成MAC帧，并将MAC帧提交给发送侧RS层；
2、RS层根据MAC帧最少发送时间原则，将MAC帧进行分片，并将各分片分配到各个通道上，对各分片增加同步0x55、0x55、LLID、FSN、CRC等头部内容，其中FSN为LLID对应的当前发送编号，然后将各分片通过各自通道的xMII接口提交给发送侧PCS层；
3、发送侧PCS层对MAC进行相应处理后，向PMA层提交MAC帧；
4、MAC帧继续通过发送侧PMA层、PMD层、MDI层处理以及通过媒介层传输到接收侧；
5、MAC帧通过接收侧媒介层、MDI层、PMD层、PMA层处理，提交给接收侧PCS层；
6、接收侧PCS层将MAC帧通过xMII接口提交给接收侧RS层；
7、接收侧RS层通过检测分片头首部的同步，即0x55、0x55，来获取分片起始位置，从分片的LLID域和帧序号域分别获得LLID和帧序号，如果所获取帧序号是LLID对应当前接收编号，则将该分片提交给MAC层，当前接收编号加1，并将缓存中与当前接收编号相同的分片进行转发，否则将接收到分片进行缓存。
实施例4
本发明的实施例还提供了一种存储介质。在一实施方式中，在本实施例中，上述存储介质可以被设置为存储用于执行以下步骤的程序代码：
S1，在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，帧序号用于标示多通道无源光网络数据包或者数据包分片的发送顺序，帧定界用于标示多通道无源光网络数据包或者数据包分片的帧起始；
S2，发送多通道无源光网络数据包或者数据包分片。
可选地，在本实施例中，上述存储介质可以包括但不限于：U盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
可选地，在本实施例中，处理器根据存储介质中已存储的程序代码执行在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和帧定界，其中，帧序号用于标示多通道无源光网络数据包或者数据包分片的发送顺序，帧定界用于标示多通道无源光网络数据包的帧起始；
可选地，在本实施例中，处理器根据存储介质中已存储的程序代码执行发送多通道无源光网络数据包。
可选地，本实施例中的具体示例可以参考上述实施例及可选实施方式中所描述的示例，本实施例在此不再赘述。
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
相应地，本发明实施例还提供一种存储介质，其中存储有计算机程序，该计算机程序配置为执行本发明实施例的多通道无源光网络的帧序号承载方法。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
工业实用性
本发明实施例的技术方案，在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，所述帧序号用于标示所述多通道无源光网络数据包或者数据包分片的发送顺序，所述帧定界用于标示所述多通道无源光网络数据包或者数据包分片的帧起始；发送所述多通道无源光网络数据包或者数据包分片，通过在NGEPON数据包中添加帧序号，同时还保证了NGEPON数据包正常功能，解决了相关技术中不能按顺序恢复NGEPON数据包的技术问题，提高了NGEPON数据包的处理效率。

Claims (18)

  1. 一种多通道无源光网络的帧序号承载方法，包括：
    在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，所述帧序号用于标示所述多通道无源光网络数据包或者数据包分片的发送顺序，所述帧定界用于标示所述多通道无源光网络数据包或者数据包分片的帧起始；
    发送所述多通道无源光网络数据包或者数据包分片。
  2. 根据权利要求1所述的方法，其中，在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号包括以下至少之一：
    在待发送的多通道无源光网络数据包或者数据包分片的头部添加所述帧序号；
    在待发送的多通道无源光网络数据包之外增加一层包装，在增加的包装内添加所述帧序号；
    在将待发送的多通道无源光网络数据包进行分片后，在数据包分片之外增加一层包装，在增加的包装内添加帧序号。
  3. 根据权利要求1所述的方法，其中，在待发送的多通道无源光网络数据包或者数据包分片中添加帧定界包括：
    重用待发送的多通道无源光网络数据包或者数据包分片的帧定界；
    在待发送的多通道无源光网络数据包或者数据包分片的头部添加所述帧定界；
    在待发送的多通道无源光网络数据包之外增加一层包装，在增加的包装内添加所述帧定界；
    在将待发送的多通道无源光网络数据包进行分片后，在数据包分片之外增加一层包装，在增加的包装内添加帧定界。
  4. 一种多通道无源光网络的帧序号承载方法，包括：
    接收多通道无源光网络数据包或者数据包分片；
    解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧定界和帧序号；
    根据所述帧定界和所述帧序号分别确定所述多通道无源光网络数据包或者数据包分片的帧起始和发送端在发送所述多通道无源光网络数据包或者数据包分片时的顺序。
  5. 根据权利要求4所述的方法，其中，解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧定界包括：
    在物理编码层PCS层恢复所述多通道无源光网络数据包或者数据包分片的的前m个字节，其中，所述m个字节用于检测所述多通道无源光网络数据包或者数据包分片的起始位置；
    将所述多通道无源光网络数据包或者数据包分片提交给MAC层，MAC层通过检测所述多通道无源光网络数据包或者数据包分片头部前n个字节得到多通道无源光网络数据包或者数据包分片的头部，并获取所述帧定界；
    其中，m、n分别为正整数。
  6. 根据权利要求4所述的方法，其中，解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧定界包括：
    在所述多通道无源光网络数据包或者数据包分片的头部解析出所述帧定界。
  7. 根据权利要求4所述的方法，其中，解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧序号包括：
    在PCS层获取帧序号；
    在向MAC层提交多通道无源光网络数据包或者数据包分片同时，将所述帧序号通过原语提交给所述MAC层，并在MAC层中得到所述多通道无源光网络数据包或者数据包分片及对应的帧序号。
  8. 根据权利要求4所述的方法，其中，解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧序号包括：
    在所述多通道无源光网络数据包或者数据包分片的头部解析出所述帧序号。
  9. 根据权利要求4所述的方法，其中，在根据所述帧定界和所述帧序号分别确定所述多通道无源光网络数据包或者数据包分片的帧起始和发送端在发送所述多通道无源光网络数据包或者数据包分片时的顺序之后，所述方法还包括：
    通过恢复和/或获取帧定界，通过帧定界获得多通道无源光网络数据包或者数据包分片的起始，并获取帧序号，恢复多通道无源光网络数据包或者数据包分片的顺序。
  10. 一种多通道无源光网络的帧序号承载装置，包括：
    添加模块，配置为在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，所述帧序号用于标示所述多通道无源光网络数据包或者数据包分片的发送顺序，所述帧定界用于标示所述多通道无源光网络数据包的帧起始；
    发送模块，配置为发送所述多通道无源光网络数据包或数据包分片。
  11. 根据权利要求10所述的装置，其中，所述添加模块包括：
    第一添加单元，配置为在待发送的多通道无源光网络数据包或者数据包分片的头部添加所述帧序号；
    第二添加单元，配置为在待发送的多通道无源光网络数据包之外增加一层包装，在增加的包装内添加所述帧序号；
    第三添加单元，配置为在将待发送的多通道无源光网络数据包进行分片后，在数据包分片之外增加一层包装，在增加的包装内添加帧序号。
  12. 根据权利要求10所述的装置，其中，所述添加模块包括：
    第四添加单元，配置为重用待发送的多通道无源光网络数据包或者数据包分片的帧定界；
    第五添加单元，配置为在待发送的多通道无源光网络数据包或者数据包分片的头部添加所述帧定界；
    第六添加单元，配置为在待发送的多通道无源光网络数据包之外增加一层包装，在增加的包装内添加所述帧定界；
    第七添加单元，配置为在将待发送的多通道无源光网络数据包进行分片后，在数据包分片之外增加一层包装，在增加的包装内添加帧定界。
  13. 一种多通道无源光网络的帧序号承载装置，包括：
    接收模块，配置为接收多通道无源光网络数据包或者数据包分片；
    解析模块，配置为解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧定界和帧序号；
    确定模块，配置为根据所述帧定界和所述帧序号分别确定所述多通道无源光网络数据包的帧起始和发送端在发送所述多通道无源光网络数据包时的顺序。
  14. 根据权利要求13所述的装置，其中，所述装置还包括：
    获取模块，配置为在所述确定模块根据所述帧定界和所述帧序号分别确定所述多通道无源光网络数据包的帧起始和发送端在发送所述多通道无源光网络数据包时的顺序之后，通过所述帧定界获得所述多通道无 源光网络数据包或者数据包分片的起始；
    恢复模块，配置为通过所述帧序号恢复多通道无源光网络数据包或者数据包分片的顺序。
  15. 根据权利要求13所述的装置，其中，所述解析模块包括：
    恢复单元，配置为在物理编码层PCS层恢复所述多通道无源光网络数据包或者数据包分片的的前m个字节，其中，所述m个字节用于检测所述多通道无源光网络数据包或者数据包分片的起始位置；
    提交单元，配置为将所述多通道无源光网络数据包或者数据包分片提交给MAC层，MAC层通过检测所述多通道无源光网络数据包或者数据包分片头部前n个字节得到多通道无源光网络数据包或者数据包分片的头部，并获取所述帧定界；
    其中，m、n分别为正整数。
  16. 根据权利要求13所述的装置，其中，所述解析模块包括：
    获取单元，配置为在PCS层获取帧序号；
    处理单元，配置为在向MAC层提交多通道无源光网络数据包或者数据包分片同时，将所述帧序号通过原语提交给所述MAC层，并在MAC层中得到所述多通道无源光网络数据包或者数据包分片及对应的帧序号。
  17. 一种多通道无源光网络的帧序号承载系统，包括发送端、接收端，
    所述发送端包括：
    添加模块，配置为在待发送的多通道无源光网络数据包或者数据包分片中添加帧序号和/或帧定界，其中，所述帧序号用于标示所述多通道无源光网络数据包或者数据包分片的发送顺序，所述帧定界用于标示所述多通道无源光网络数据包或者数据包分片的帧起始；
    发送模块，配置为发送所述多通道无源光网络数据包或数据包分片；
    所述接收端包括：
    接收模块，配置为接收多通道无源光网络数据包或者数据包分片；
    解析模块，配置为解析所述多通道无源光网络数据包或者数据包分片得到承载在所述多通道无源光网络数据包或者数据包分片中的帧定界和/或帧序号；
    确定模块，配置为根据所述帧定界和所述帧序号分别确定所述多通道无源光网络数据包的帧起始和发送端在发送所述多通道无源光网络数据包时的顺序。
  18. 一种存储介质，所述存储介质中存储有计算机可执行指令，该计算机可执行指令配置为执行权利要求1-3任一项所述的多通道无源光网络的帧序号承载方法，或者权利要求4-9任一项所述的多通道无源光网络的帧序号承载方法。
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