WO2017177549A1 - Architecture de réseau optique passif, procédé permettant à une architecture de réseau optique passif d'exécuter une transmission de données, et dispositif de réseau optique - Google Patents

Architecture de réseau optique passif, procédé permettant à une architecture de réseau optique passif d'exécuter une transmission de données, et dispositif de réseau optique Download PDF

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Publication number
WO2017177549A1
WO2017177549A1 PCT/CN2016/086906 CN2016086906W WO2017177549A1 WO 2017177549 A1 WO2017177549 A1 WO 2017177549A1 CN 2016086906 W CN2016086906 W CN 2016086906W WO 2017177549 A1 WO2017177549 A1 WO 2017177549A1
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Prior art keywords
data
channel
transmitted
onu
channels
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PCT/CN2016/086906
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English (en)
Chinese (zh)
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张伟良
李明生
袁立权
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2589—Bidirectional transmission
    • H04B10/25891—Transmission components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • 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
    • H04Q11/0003—Details
    • 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
    • H04Q11/0005—Switch and router aspects
    • 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

Definitions

  • the embodiments of the present invention relate to, but are not limited to, optical communication technologies, and in particular, a passive optical network (PON) architecture, a method for implementing data transmission, and an optical network device.
  • PON passive optical network
  • Passive Optical Network is an important technical means for user access, as shown in Figure 1.
  • the optical line terminal OLT
  • the optical splitter passes through the branch optical fiber and multiple user-side optical network units (ONU, Optical Network). Unit), the OLT and the ONU communicate through a pair of wavelengths.
  • the OLT can use a multi-wavelength optical module to configure four or more uplink and downlink wavelengths.
  • the OLT supports multiple wavelengths, as shown in FIG. 2, in the downlink direction, a plurality of different wavelengths ⁇ d0 , ⁇ d1 ... ⁇ dn After being merged at the central office, it is transmitted to an Optical Wavelength Distribution Network (OWDN) and distributed to each ONU according to different wavelengths.
  • OWDN Optical Wavelength Distribution Network
  • different user ONUs emit different optical wavelengths ⁇ u0 , ⁇ u1 ... ⁇ un
  • the OLT In this way, the uplink and downlink transmission of the optical signal is completed.
  • the user side needs to deploy a corresponding number of ONUs supporting a single wavelength to respectively correspond to each wavelength.
  • ONUs need to support larger throughput and bandwidth.
  • the number of wavelengths supported by ONUs has gradually evolved from one to more than one. How to support ONUs with different wavelengths under the same ODN and how to implement them Upgrade evolution, there is no relevant technical solution.
  • the present invention provides a passive optical network architecture, a method for implementing data transmission, and an optical network device, which can implement control of an ONU supporting a multi-wavelength OLT to achieve rate adaptation.
  • an embodiment of the present invention provides a passive optical network PON architecture, including: an optical line terminal OLT supporting multiple channels, and one or the same optical channel network ODN supporting one or more channels. More than one optical network unit ONU; wherein
  • the OLT/ONU is set to obtain the number of channels supported by the transmission data and/or the corresponding channel, and the data to be transmitted is evenly distributed and transmitted on the corresponding channel, and the preset data is transmitted or not transmitted on other channels at the same time. ;
  • the ONU/OLT is configured to receive data on its own supported channel and reassemble the received data according to the transmission rules as needed.
  • the OLT is configured to: acquire a destination ONU that needs to transmit data, and a number of channels supported by the destination ONU;
  • the data to be transmitted is equally divided into j shares, and each data is separately allocated to each channel supported by the destination ONU, and the corresponding time transmission on the remaining (ij) channels is preset. Data or not transmitting data;
  • i is the number of channels supported by the OLT, i is a positive integer greater than or equal to 1; j is the number of channels supported by the ONU, j is a positive integer greater than or equal to 1 and j is less than or equal to i.
  • the OLT is further configured to: encapsulate the data to be sent or data fragments on each channel into data frames and transmit the data to the target ONU.
  • the pre-set data is idle idle data, and/or repetition of the data to be transmitted, and/or other preset data.
  • the destination ONU is configured to: the target ONU supporting the j wavelength receives the data frame on the channel 0 to the channel (j-1).
  • the destination ONU is further configured to: receive data and/or data fragments according to channel information and/or address information in the data frame and local channel information and/or address information, and receive the data. Fragmentation for data reorganization.
  • the OLT is further configured to allocate an uplink bandwidth to the ONU: for the target ONU supporting the j channel, the same bandwidth is allocated on the channel 0 to the channel (j-1), and the channel j and the channel (j+1) are respectively allocated. ... The bandwidth of the corresponding location of the channel (i-1) is not allocated;
  • i is the number of channels supported by the OLT, i is a positive integer greater than or equal to 1; j is the number of channels supported by the ONU, j is a positive integer greater than or equal to 1 and j is less than or equal to i.
  • the ONU is further configured to: obtain an uplink bandwidth allocated by the OLT on each channel, uniformly distribute data in each uplink bandwidth, and not transmit data on other wavelengths that do not obtain bandwidth allocation.
  • the OLT is further configured to: receive a data frame on a channel supported by itself, receive data according to channel information and/or address information in the data frame, and local channel information and/or address information, and/or Data fragmentation, and data reassembly of the received data fragments sent by the same ONU in the same time slot;
  • an embodiment of the present invention further provides a method for implementing data transmission in a PON architecture, including:
  • the OLT/ONU obtains the number of channels supported by the transmission data and/or the corresponding channel, and uniformly distributes the data to be transmitted on the corresponding channel, and transmits the preset data or does not transmit the data on other channel waves at the same time;
  • the OLT supports multiple channels; the ONU supports one or more channels and is located under the same ODN.
  • the OLT acquires the number of channels and/or corresponding channels supported by the transmission data, and uniformly distributes the data to be transmitted on the corresponding channel, including:
  • the data to be transmitted is equally divided into j shares, and each data is separately allocated to each channel supported by the destination ONU, and the corresponding time transmission on the remaining (ij) channels is preset. Data or not transmitting data;
  • i is the number of channels supported by the OLT, i is a positive integer greater than or equal to 1; j is the number of channels supported by the ONU, j is a positive integer greater than or equal to 1 and j is less than or equal to i.
  • the method further includes: the OLT dividing data to be sent or data on each channel
  • the chip is encapsulated into a data frame and transmitted to the destination ONU.
  • the pre-set data is idle idle data, and/or repetition of the data to be transmitted, and/or other preset data.
  • the sizes of the to-be-sent data corresponding to the same location in the j channels are the same.
  • the size of the sent data of each of the j channels is the same, and the XGEM frame or the medium access control MAC frame size of the new generation PON encapsulation method is the same;
  • the physical layer frame PHY Frame size of the data frame completed on the j channels is the same.
  • the framing sub-layer FS of the data frame is framing, insert the same number of physical layer OAM PLOAM message numbers and transmission bandwidth mapping BWmap entries; or
  • PLOAM messages and BWmap entries sent to all ONUs are copied on all channels; or,
  • the PLOAM message and BWmap sent to the ONU supporting the j channel are transmitted only on channel 0, channel 1, channel 2, ... wavelength j.
  • the method further includes:
  • the OLT allocates an uplink bandwidth to the ONU, the same bandwidth, channel j, channel (j+1), and channel (i) are allocated to the ONUs supporting the j channel on the channel 0 to the channel (j-1). -1) The bandwidth of the corresponding location is not allocated;
  • i is the number of channels supported by the OLT, i is a positive integer greater than or equal to 1; j is the number of channels supported by the ONU, j is a positive integer greater than or equal to 1 and j is less than or equal to i.
  • the method further includes:
  • the embodiment of the present invention further provides a method for implementing data transmission in a PON architecture, including: an ONU supporting a j channel receiving a data frame on a channel 0 to a channel (j-1);
  • j is the number of channels supported by the ONU
  • j is a positive integer greater than or equal to 1
  • j is less than or equal to i
  • i is the number of channels supported by the OLT.
  • the method further includes:
  • the ONU acquires an uplink bandwidth allocated by the OLT on each channel;
  • the data is evenly distributed and transmitted within each uplink bandwidth, and no data is transmitted at other wavelengths where bandwidth allocation is not obtained;
  • the allocation of the uplink bandwidth includes: for the target ONU supporting the j channel, the same bandwidth is allocated on the channel 0 to the channel (j-1), and the channel j, the channel (j+1), and the channel (i-1) are respectively corresponding. The bandwidth of the location is not allocated.
  • the embodiment of the present invention further provides an optical network device, including a first acquiring module and a first processing module;
  • a first obtaining module configured to obtain a number of channels supported by the transmission data and/or a corresponding channel
  • the first processing module is configured to evenly distribute the data to be transmitted on the corresponding channel for transmission, and transmit preset data or no data on other channel waves at the same time.
  • the first acquiring module is specifically configured to: obtain a destination ONU that needs to transmit data, and a number of channels supported by the destination ONU;
  • the first processing module is specifically configured to:
  • the data to be transmitted is equally divided into j shares, and each data is separately allocated to each channel supported by the destination ONU, and the corresponding time transmission on the remaining (ij) channels is preset. Data or not transmitting data;
  • i is the number of channels supported by the OLT, i is a positive integer greater than or equal to 1; j is the number of channels supported by the ONU, j is a positive integer greater than or equal to 1 and j is less than or equal to i.
  • the first processing module is further configured to: send data or numbers to be sent on each channel The fragment is encapsulated into a data frame and transmitted to the destination ONU.
  • the pre-set data is idle idle data, and/or repetition of the data to be transmitted, and/or other preset data.
  • the sizes of the to-be-sent data corresponding to the same location in the j channels are the same.
  • the size of the sent data of each of the j channels is the same, and the XGEM frame or the MAC frame size of the data frame encapsulation is the same;
  • the physical layer frame PHY Frame size of the data frame completed on the j channels is the same.
  • PLOAM messages and BWmap entries sent to all ONUs are copied on all channels; or,
  • the PLOAM message and BWmap sent to the ONU supporting the j channel are transmitted on channel 0, channel 1, channel 2, ... channel j.
  • the first processing module is further configured to allocate an uplink bandwidth to the ONU, and for the ONUs that support the j channel, respectively allocate the same bandwidth on the channel 0 to the channel (j-1), and the channel j and the channel respectively The bandwidth of the corresponding position of (j+1)... and channel (i-1) is not allocated;
  • i is the number of channels supported by the OLT, i is a positive integer greater than or equal to 1; j is the number of channels supported by the ONU, j is a positive integer greater than or equal to 1 and j is less than or equal to i.
  • the method further includes receiving, configured to receive a data frame on a channel supported by the OLT, and receive data according to channel information and/or address information in the data frame and local channel information and/or address information. And/or data fragmentation, and data reassembly of the received data fragments sent by the same ONU in the same time slot;
  • the optical network device is disposed in an OLT or is a separate entity.
  • an embodiment of the present invention further provides an optical network device, including: a second acquisition mode Block, a second processing module; wherein
  • a second acquiring module configured to receive a data frame on channel 0 to channel (j-1);
  • the second processing module is configured to receive data and/or data fragments according to channel information and/or address information in the received data frame and local channel information and/or address information of the ONU, and perform data fragmentation on the received data.
  • j is the number of channels supported by the ONU
  • j is a positive integer greater than or equal to 1
  • j is less than or equal to i
  • i is the number of channels supported by the OLT.
  • the second obtaining module is further configured to: obtain an uplink bandwidth allocated by the OLT on each channel;
  • the second processing module is further configured to: uniformly distribute data in each uplink bandwidth, and not transmit data on other wavelengths that do not obtain bandwidth allocation;
  • the allocation of the uplink bandwidth includes: for the target ONU supporting the j channel, the same bandwidth is allocated on the channel 0 to the channel (j-1), and the channel j, the channel (j+1), and the channel (i-1) are respectively corresponding. The bandwidth of the location is not allocated.
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions for performing the method for implementing data transmission by any of the PON architectures described above.
  • the PON architecture provided by the present application includes: an optical line terminal OLT supporting multiple channels, and one or more optical network units ONU supporting one or more channels under the same optical distribution network ODN.
  • the OLT/ONU obtains the number of channels supported by the transmission data and/or the corresponding channel, uniformly distributes the data to be transmitted on the corresponding channel, and transmits the preset data or not transmits on other channels at the same time.
  • Data; ONU/OLT receiving data on its own supported channels.
  • the technical solution provided by the embodiment of the present invention implements the control of the ONU supporting the multi-wavelength OLT, and achieves rate adaptation.
  • FIG. 1 is a schematic structural diagram of a PON system in a related art
  • FIG. 2 is a schematic diagram of an uplink and downlink transmission scenario in which the OLT supports multiple wavelengths in the related art
  • FIG. 3 is a schematic diagram of a PON network architecture of a first embodiment of an ONU supporting different wavelengths under the same ODN according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a PON network architecture of a second embodiment of an ONU supporting different wavelengths under the same ODN according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a PON network architecture of a third embodiment of an ONU supporting different wavelengths under the same ODN according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of uniformly distributing data according to the number of wavelengths according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a first embodiment of ITU-T data downlink transmission based on a PON architecture according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of a first embodiment of IEEE data downlink transmission based on a PON architecture according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a second embodiment of ITU-T data downlink transmission based on a PON architecture according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a second embodiment of IEEE data downlink transmission based on a PON architecture according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of a third embodiment of ITU-T data downlink transmission based on a PON architecture according to an embodiment of the present invention.
  • FIG. 12 is a schematic diagram of a third embodiment of IEEE data downlink transmission based on a PON architecture according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of an embodiment of data uplink transmission in a PON architecture according to an embodiment of the present invention.
  • FIG. 14 is a schematic structural diagram of a first embodiment of an optical network device according to an embodiment of the present invention.
  • FIG. 15 is a schematic structural diagram of a second embodiment of an optical network device according to an embodiment of the present invention.
  • the Next Generation Ethernet Passive Optical Network is under discussion in standardization.
  • One technology is to achieve 25 Gigabits per second (Gbps) (single 25G) at a single wavelength rate, and can follow single wavelength, 2 wavelength, 3 wavelength.
  • Step-by-step deployment of 4 wavelengths that is, support for 1 wavelength (the number of channels is 1), 2 wavelengths (the number of channels is 2), 3 wavelengths (the number of channels is 3), 4 wavelengths (the number of channels is 4), etc.
  • the ONUs coexist and are compatible under the same Optical Distribution Network (ODN).
  • ODN Optical Distribution Network
  • the rate of each wavelength here is the same and both are 25G, but in practical applications, there may be cases where the rate of each wavelength is not completely the same, for example, the rate of each wavelength may be different from 25G.
  • the uplink and downlink rates of each wavelength may also be different. In this case, the method of the present invention can still be employed.
  • the rate of each channel is completely the same, the data to be transmitted is completely evenly distributed on each transmission channel, and when the rate of each channel is not completely the same, the data to be transmitted is evenly distributed on each transmission channel according to the rate ratio of each channel.
  • FIG. 3 is a schematic diagram of a network architecture of a first embodiment of an ONU supporting different wavelengths under the same ODN according to an embodiment of the present invention.
  • the OLT is implemented at a single wavelength rate of 25 Gbps, and all ONUs are implemented at a single wavelength rate. 25Gbps, in this mode, all ONUs only support a single wavelength, the OLT also supports a single wavelength, and the wavelength is fixed at ⁇ 0 .
  • the number of channels supported by ONU1, ONU2, ... ONUn is 1.
  • FIG. 4 is a schematic diagram of a network architecture of a second embodiment of an ONU supporting different wavelengths under the same ODN according to an embodiment of the present invention.
  • the OLT is 50 Gbps at a wavelength of 2
  • ONU1 and ONU2 are implemented at a single wavelength rate.
  • ONU3 achieves 50 Gbps at 2 wavelengths.
  • the OLT supports 2 wavelengths, and ONUs supporting 2 wavelengths coexist with ONUs supporting single wavelengths.
  • the wavelength of the single-wavelength ONU is fixed to ⁇ 0
  • the wavelength of the 2-wavelength ONU is fixed to ⁇ 0 and ⁇ 1 .
  • the number of channels supported by ONU1 and ONU2 is 1, and the wavelength is fixed to ⁇ 0 ; the number of channels supported by ONU3 is 2, and the wavelengths are fixed to ⁇ 0 and ⁇ 1 respectively .
  • FIG. 5 is a schematic diagram of a network architecture of a third embodiment for supporting ONUs of different wavelengths under the same ODN according to an embodiment of the present invention.
  • the OLT is 100 Gbps at a wavelength of 4 Gbps
  • the ONU 1 is 25 Gbps at a single wavelength rate.
  • ONU2 achieves 50 Gbps for 2 wavelengths and 100 Gbps for 4 wavelengths.
  • the OLT supports 4 wavelengths, supports 4 wavelength ONUs, supports single wavelength ONUs, and supports 2 wavelength ONUs.
  • the wavelength of the single-wavelength ONU is fixed to ⁇ 0
  • the wavelengths of the two-wavelength ONU are fixed to ⁇ 0 and ⁇ 1 , respectively
  • the wavelengths of the four-wavelength ONU are fixed to ⁇ 0 , ⁇ 1 , ⁇ 2 , and ⁇ 3 , respectively .
  • the number of channels supported by ONU1 is 1 and the wavelength is fixed to ⁇ 0
  • the number of channels supported by ONU2 is 2 and the wavelengths are fixed to ⁇ 0 and ⁇ 1 respectively
  • the number of channels supported by ONU3 is 4 and the wavelengths are fixed to ⁇ 0 , ⁇ 1 , ⁇ 2 and ⁇ 3 .
  • the PON architecture of the embodiment of the present invention includes at least: an OLT supporting multiple channels, and one or more ONUs under the same ODN supporting one or more channels, where
  • the OLT/ONU is set to obtain the number of channels supported by the transmission data and/or the corresponding channel, and the data to be transmitted is evenly distributed and transmitted on the corresponding channel, and the preset data is transmitted or not transmitted on other channels at the same time. ;
  • the ONU/OLT is configured to receive data on the channel waves supported by itself, and reassemble the received data according to the transmission rules as needed.
  • the number of channels in the PON architecture of the present invention may be equal to the number of wavelengths, or may be equal to the number of optical fibers, or may be the number of wavelengths included in multiple optical fibers.
  • the OLT is configured to acquire the number of channels supported by the destination ONU and the destination ONU and/or the corresponding channel; the data to be transmitted is evenly distributed in the corresponding channel according to the number of channels of the obtained ONU and the number of channels supported by the host. Up-transmission, transmitting pre-set data or not transmitting data on other channels at the same time.
  • the corresponding channel refers to a channel supported by both the OLT and the destination ONU, and the other channels refer to channels other than the corresponding channel in the channel supported by the OLT.
  • the destination ONU is set to receive data on its own supported channel and send it as needed.
  • the rules reassemble the received data accordingly.
  • the OLT is specifically configured to: obtain the destination ONU of the data to be transmitted and the number of channels supported by the destination ONU; for each destination ONU, divide the data to be transmitted into j shares equally, and assign each data to the destination ONU separately. Supported on each channel, the remaining (ij) channels corresponding to the transmission of pre-set data or no data; where i is the number of channels supported by the OLT, i is a positive integer greater than or equal to 1; j is The number of channels supported by the ONU, j is a positive integer greater than or equal to 1 and j is less than or equal to i.
  • the OLT is further configured to: encapsulate the data to be sent or the data fragment on each channel into a data frame and transmit the data to the target ONU.
  • the destination ONU is specifically configured to: the destination ONU supporting the j wavelength receives the data frame on the channel 0 to the channel (j-1).
  • the destination ONU is further configured to: receive data and/or data fragments according to channel information and/or address information in the data frame and local channel information and/or address information, and perform data reassembly on the received data fragments.
  • the preset data is idle idle data, and/or repetition of data to be transmitted, and/or other preset data.
  • the OLT is also configured to allocate an upstream bandwidth for the ONU: for the destination ONU supporting the j channel, the same bandwidth is allocated on channel 0 to channel (j-1), channel j, channel (j+1), and channel (i- 1) The bandwidth of the corresponding location is not allocated.
  • the destination ONU is further configured to: obtain the uplink bandwidth allocated by the OLT on each channel, uniformly distribute the data in each uplink bandwidth, and not transmit data on other wavelengths that do not obtain bandwidth allocation.
  • the OLT is further configured to receive a data frame on its own supported channel, receive data and/or data fragments according to channel information and/or address information and local channel information and/or address information in the data frame, and receive the data.
  • the destination ONU to which the data is sent and the number of wavelengths supported by the destination ONU; where the data transmission request submitted by the service layer carries the data to be transmitted, the wavelength information to be transmitted by the data, and/or the destination ONU information, etc.
  • the OLT can extract the number of wavelengths to the destination ONU and its support according to the data transmission request.
  • the data transmission generally has queue management.
  • the queue management can be an actual module or a virtual module. For example, combined with other modules, the data will be put into the queue first, and then sent. The data is sent from the queue for transmission.
  • the data to be transmitted is evenly distributed and transmitted on the corresponding wavelength.
  • the data to be transmitted is evenly distributed on the corresponding wavelength according to the obtained number of wavelengths of the obtained ONU, and specifically includes:
  • the ONU supports j wavelengths, where i is a positive integer greater than or equal to 1, j is a positive integer greater than or equal to 1 and j is less than or equal to i. Then, for each ONU, the data to be transmitted is equally divided into j shares, each of which is allocated to each wavelength supported by the ONU, and for the remaining (ij) wavelengths, the preset data is transmitted. Or do not transfer data.
  • the ONU can encapsulate the data to be transmitted or the data fragment corresponding to each wavelength into a data frame and transmit it to the destination ONU.
  • the pre-set data may be idle data, and/or repetition of data to be transmitted, and/or other preset data such as other data sent to the destination ONU, or data sent to other ONUs, etc. Wait.
  • the bandwidth allocated by the OLT to the ONU since the bandwidth allocated by the OLT to the ONU has determined which wavelengths the ONU transmits data, it is not necessary to transmit the preset data at other wavelengths, that is, directly transmit data.
  • Distributing each piece of data to the wavelength corresponding to each wavelength supported by the ONU for uniform transmission includes: placing each piece of data into a queue and evenly distributing the transmissions at each wavelength supported by the ONU.
  • the OLT supports 4 wavelengths
  • the ONU1 supports a single wavelength
  • the ONU2 supports 2 wavelengths
  • the ONU3 supports 4 wavelengths.
  • FIG. 6 is a schematic diagram of an embodiment of uniformly distributing data according to the number of wavelengths according to an embodiment of the present invention.
  • an ONU having a wavelength of 1 that is, an ONU, such as ONU1
  • the entire data to be transmitted is put into queue 0 (queue0); And put the same size of idle data in the other three queues, queue1, queue2, and queue3;
  • the data to be transmitted is evenly divided into two equal parts, which are respectively placed into queue0 and queue1. For example, odd bytes can be placed in queue0, even numbers can be placed in queue1, and in queue2. And queue3 respectively put id data of 1/2 data size;
  • the data to be transmitted is evenly divided into 4 shares, which are respectively placed into queue0, queue1, queue2, and queue3.
  • the first byte is placed in queue0 and the second byte is placed in queue1.
  • the third byte is placed in queue2, the fourth byte is placed in queue3, then the fifth byte is placed in queue0, the sixth byte is placed in queue1, the seventh byte is placed in queue2, and the eighth byte is placed in queue3. ,So on and so forth.
  • FIG. 7 is a schematic diagram of a first embodiment of ITU-T data downlink transmission based on a PON architecture according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of a first embodiment of IEEE data downlink transmission based on a PON architecture according to an embodiment of the present invention.
  • the entire data1 (abbreviated as 1 in the drawing) is placed.
  • queue 0 and on the corresponding wavelength ⁇ 0 other queues, ie queue1, queue2 and queue3, are placed in the same size of idle data; for example, if the ONU supports 2 wavelengths, as shown in Figure 7 and Figure 8.
  • the data 2 to be transmitted (abbreviated as 2 in the drawing) is the transmission in the case where the ONU supports 2 wavelengths, and the data 2 is equally divided into data 2-1 (abbreviated as 2-1 in the drawing) and data 2-2 (Fig. The middle is abbreviated as 2-2), where data2-1 is placed in queue0 and transmitted on the corresponding wavelength ⁇ 0 , data2-2 is placed in queue1 and transmitted on the corresponding wavelength ⁇ 1 , while other queues are queue2 and queue3.
  • the data3 to be transmitted is the transmission when the ONU supports 4 wavelengths
  • the data3 (abbreviated as 3 in the drawing) is equally divided into data3-1 (abbreviated as 3- in the drawing) 1), data3-2 (abbreviated as 3-2 in the drawing), data3-3 (abbreviated as 3-3 in the drawing), and data3-4 (abbreviated as 3-4 in the drawing), where data3-1 Placed in queue 0 and transmitted on the corresponding wavelength ⁇ 0 , data3-2 is placed in queue 1 and transmitted on the corresponding wavelength ⁇ 1 , data 3-3 is placed in queue 2 and transmitted on the corresponding wavelength ⁇ 2 , and data 3-4 is placed Queue3 is transmitted on the corresponding wavelength ⁇ 3 .
  • the number of idles in the first embodiment may be replaced with data to be sent, that is, data to be transmitted may be repeatedly transmitted on an unsupported wavelength.
  • data to be transmitted may be repeatedly transmitted on an unsupported wavelength.
  • the data to be transmitted is entirely placed in queue 0, and the data to be transmitted is also placed in the other three queues, namely queue1, queue2, and queue3;
  • the data to be transmitted is evenly divided into two equal parts, which are respectively placed into queue0 and queue1. For example, odd bytes can be placed in queue0, even numbers can be placed in queue1; The average of the transferred data is divided into two parts and placed into queue2 and queue3 respectively;
  • the data to be transmitted is evenly divided into 4 points, which are respectively placed into queue0, queue1, queue2, and queue3.
  • the first byte is placed in queue0 and the second byte is placed in queue1.
  • the third byte is placed in queue2, the fourth byte is placed in queue3, then the fifth byte is placed in queue0, the sixth byte is placed in queue1, the seventh byte is placed in queue2, and the eighth byte is placed in queue3. ,So on and so forth.
  • FIG. 9 is a schematic diagram of a second embodiment of ITU-T data downlink transmission based on a PON architecture according to an embodiment of the present invention
  • FIG. 10 is a schematic diagram of a second embodiment of IEEE data downlink transmission based on a PON architecture according to an embodiment of the present invention.
  • the other queues ie queue1, queue2 and queue3, are placed in the same size of the entire data1; for example, if the ONU supports 2 wavelengths, as shown in Figure 9 and Figure 10.
  • the data 2 to be transmitted (abbreviated as 2 in the drawing) is the transmission in the case where the ONU supports 2 wavelengths, and the data 2 is equally divided into data 2-1 (abbreviated as 2-1 in the drawing) and data 2-2 (Fig. The middle is abbreviated as 2-2), where data2-1 is placed in queue0 and transmitted on the corresponding wavelength ⁇ 0 , data2-2 is placed in queue1 and transmitted on the corresponding wavelength ⁇ 1 , while other queues are queue2 and queue3.
  • the data3 to be transmitted is the transmission when the ONU supports 4 wavelengths
  • the data3 (abbreviated as 3 in the drawing) is equally divided into data3-1 (the abbreviated in the drawing is 3-1), data3-2 (abbreviated as 3-2 in the drawing), data3-3 (abbreviated as 3-3 in the drawing), and data3-4 (abbreviated as 3-4 in the drawing), where data3 -1 is placed in queue 0 and transmitted on the corresponding wavelength ⁇ 0
  • data3-2 is placed in queue 1 and transmitted on the corresponding wavelength ⁇ 1
  • data 3-3 is placed in queue 2 and transmitted on the corresponding wavelength ⁇ 2
  • data 3-4 Placed in queue3 and transmitted on the corresponding wavelength ⁇ 3 .
  • the number of idles in the first embodiment may be replaced with other pre-set data, that is, data set in advance, such as data received by other ONUs, may be transmitted on a wavelength that is not supported by the target ONU.
  • data set in advance such as data received by other ONUs
  • the data to be transmitted is entirely put into queue 0; and, the preset data1' may be entirely placed in queue1, where data1' is sent to the target.
  • the data of other ONUs other than ONU, and the other two queues, namely queue2 and queue3, are placed with idle data;
  • the data to be transmitted is evenly divided into two equal parts, which are respectively placed into queue0 and queue1. For example, odd bytes can be placed in queue0, even numbers can be placed in queue1, and in queue2. And queue3 respectively put id data of 1/2 data size;
  • the data to be transmitted is evenly divided into 4 points, which are respectively placed into queue0, queue1, queue2, and queue3.
  • the first byte is placed in queue0 and the second byte is placed in queue1.
  • the third byte is placed in queue2, the fourth byte is placed in queue3, then the fifth byte is placed in queue0, the sixth byte is placed in queue1, the seventh byte is placed in queue2, and the eighth byte is placed in queue3. ,So on and so forth.
  • FIG. 11 is a schematic diagram of a third embodiment of ITU-T data downlink transmission based on a PON architecture according to an embodiment of the present invention
  • FIG. 12 is a schematic diagram of a third embodiment of IEEE data downlink transmission based on a PON architecture according to an embodiment of the present invention.
  • the entire data1 (abbreviated as 1 in the drawing) is placed.
  • ⁇ 0 is transmitted, data3-2 is placed in queue1 and transmitted on the corresponding wavelength ⁇ 1 , data3-3 is placed in queue 2 and transmitted on the corresponding wavelength ⁇ 2 , and data 3-4 is placed in queue 3 and at the corresponding wavelength ⁇ 3 Transfer on.
  • the next-generation passive optical network is an important branch in the evolution of PON technology.
  • the encapsulation process of data transmission generally includes: data is first encapsulated into a new generation PON encapsulation method ( XGEM (XG-PON Encapsulation Method) frame, the XGEM frame includes the overhead and the payload, and the XGEM port identifier (Port ID) is carried in the overhead; the multiple XGEM frames are encapsulated into the super frame, and the superframe includes the overhead and the payload, and the overhead includes The physical layer OAM (PLOAM, Physical Layer OAM) message, the transmission bandwidth mapping (BWmap) bandwidth allocation, etc.; the super frame is processed by FEC and then encapsulated into a physical layer frame (PHY Frame), and the physical frame includes a frame header and a payload.
  • PLOAM Physical Layer OAM
  • the frame header is used by the receiver to detect the starting position of the physical frame.
  • EPON/10GEPON is another important branch of PON evolution.
  • the encapsulation process of data transmission generally includes: data is first encapsulated into a medium access control (MAC) frame, and the MAC frame includes overhead and payload. Multiple MAC frames are then encapsulated into physical frames, which include overhead and payload headers and payloads.
  • MAC medium access control
  • the sizes of the to-be-sent data corresponding to the same position in the j wavelengths are the same.
  • the size of the transmission data extracted every time for the j wavelengths is the same, and the XGEM frame or the MAC frame size of the package is also the same.
  • the size of the physical layer frame (PHY Frame) completed in the j wavelengths is the same, and in order to ensure that the data transmitted on each wavelength is good, further includes:
  • PLOAM messages and BWmap entries sent to all ONUs are copied at all wavelengths, ie PLOAM messages and BWmap entries on each wavelength include PLOAM messages and BWmap entries for all wavelengths; or
  • the PLOAM message and BWmap sent to the ONU supporting the j-wavelength are transmitted only on ⁇ 0 , ⁇ 1 , ⁇ 2 ... ⁇ j .
  • the size of the to-be-sent data corresponding to the same location in the four queues is the same; the size of the sent data of each of the four queues is the same.
  • the encapsulated XGEM frame size is also the same;
  • the physical layer frames (PHY Frames) that are completed at the four wavelengths are the same size. To ensure that the data transmitted on each wavelength is good, further includes:
  • PLOAM messages and BWmap entries sent to all ONUs are copied at all wavelengths; or,
  • the PLOAM message and BWmap sent to the ONU supporting the j-wavelength are transmitted only on ⁇ 0 , ⁇ 1 , ⁇ 2 and ⁇ j .
  • the PLOAM message and BWmap sent to the ONU supporting 2 wavelengths are only transmitted on ⁇ 0 and ⁇ 1
  • the PLOAM message and BWmap sent to the ONU supporting 4 wavelengths are transmitted on ⁇ 0 , ⁇ 1 , ⁇ 2 and ⁇ 3 . .
  • the downlink data sent by the OLT to the ONU may be discontinuous, and the data is sent in a burst manner, such as in an IEEE Ethernet Passive Optical Network (EPON) system, and the manner of managing information similar to PLOAM/BWmap may be adopted.
  • MPCP Multi-Point Control Protocol
  • MPCP can be transmitted as data, that is, transmitted uniformly on the wavelengths according to the number of wavelengths.
  • MPCP can also transmit on the wavelengths supported by each ONU, while transmitting idle data or not transmitting data on other wavelengths.
  • MPCP can also be fixed at Sending on ⁇ 0 , transmitting idle data or not transmitting data at positions corresponding to time on ⁇ 1 , ⁇ 2 , and ⁇ 3 .
  • MPCP can also send one copy per wavelength.
  • the OLT supports the i-wavelength.
  • the method for implementing data transmission according to the present invention further includes:
  • the ONU supporting the j wavelength receives the data frame on ⁇ 0 ⁇ ⁇ (j-1) , and receives the data frame according to the received data frame and the local wavelength information and/or address information; correspondingly according to the OLT side transmission mode
  • the received data frame is decapsulated, and data is reorganized for data fragmentation. At this time, if an idle frame is received at some wavelengths, and/or the data frame is repeated, it may be directly discarded.
  • the method for implementing data transmission according to the present invention further includes:
  • bandwidth is allocated on ⁇ 0 ⁇ ⁇ (j-1) , and ⁇ j , ⁇ (j+1) ... and ⁇ (i-1) are corresponding positions. Bandwidth is not allocated;
  • the ONU sends uplink data within the allocated bandwidth.
  • FIG. 13 is a schematic diagram of an embodiment of data uplink transmission in a PON architecture according to an embodiment of the present invention, which supports a single-wavelength ONU to transmit a data frame to a bandwidth allocated to its own wavelength at a wavelength ⁇ 0 , corresponding to ⁇ 1 , ⁇ 2 , and ⁇ 3
  • the location of the time does not send data, and the OLT receives the data frame according to the received data frame and the local wavelength information and/or the address information, and may also receive the data frame according to the bandwidth allocated by the OLT to the ONU;
  • An ONU supporting 2 wavelengths transmits data frames within its own bandwidth on ⁇ 0 and ⁇ 1 , and does not transmit data at positions corresponding to ⁇ 2 and ⁇ 3 at the corresponding time.
  • the OLT according to the received data frame and local wavelength information And/or receiving the data frame by the address information, and receiving the data frame according to the bandwidth allocated by the OLT to the ONU; and performing data reassembly on the received data fragment according to the sending manner of the ONU side.
  • An ONU supporting 4 wavelengths transmits data frames within its own bandwidth on ⁇ 0 , ⁇ 1 , ⁇ 2 , and ⁇ 3 , and the OLT receives data frames according to the received data frames and local wavelength information and/or address information.
  • the data frame may also be received according to the bandwidth allocated by the OLT to the ONU; and the received data fragment is reorganized according to the transmission mode of the ONU side.
  • bandwidth is allocated on ⁇ 0 , and bandwidths at corresponding positions of ⁇ 1 , ⁇ 2 and ⁇ 3 are not allocated; correspondingly, ONU is only on ⁇ 0
  • the data is transmitted within the allocated bandwidth, and idle data is not required on ⁇ 1 , ⁇ 2 and ⁇ 3 ;
  • the same bandwidth is allocated on ⁇ 0 and ⁇ 1 , and the bandwidths at corresponding positions of ⁇ 2 and ⁇ 3 are not allocated; accordingly, the ONU is allocated only on ⁇ 0 and ⁇ 1 Data is transmitted within the bandwidth, and idle data is not required on ⁇ 2 and ⁇ 3 ;
  • ONU3 supporting 4 wavelengths the same bandwidth is allocated on ⁇ 0 , ⁇ 1 , ⁇ 2 and ⁇ 3 ; correspondingly, ONUs supporting 4 wavelengths are allocated on ⁇ 0 , ⁇ 1 , ⁇ 2 and ⁇ 3 Send data within the bandwidth.
  • FIG. 14 is a schematic structural diagram of a first embodiment of an optical network device according to an embodiment of the present invention. As shown in FIG. 14, the method includes at least a first acquiring module and a first processing module.
  • a first obtaining module configured to obtain a number of channels supported by the transmission data and/or a corresponding channel
  • the first processing module is configured to evenly distribute the data to be transmitted on the corresponding channel for transmission, and transmit preset data or no data on other channel waves at the same time.
  • the first acquiring module is specifically configured to: obtain the destination ONU of the data to be transmitted and the number of channels supported by the destination ONU; correspondingly,
  • the first processing module is specifically configured as:
  • the data to be transmitted is equally divided into j shares, and each data is separately allocated to each channel supported by the destination ONU, and the corresponding time transmission on the remaining (ij) channels is preset. Data or not transmitting data;
  • i is the number of channels supported by the OLT, i is a positive integer greater than or equal to 1; j is the number of channels supported by the ONU, j is a positive integer greater than or equal to 1 and j is less than or equal to i.
  • the first processing module is further configured to: encapsulate the data to be sent or the data fragment on each channel into a data frame and transmit the data to the destination ONU.
  • the preset data may be idle data, and/or data to be transmitted. Repeat, and/or other pre-set data, etc.
  • Assigning each copy to each of the wavelengths supported by the ONU includes: placing each piece of data in its respective queue and distributing it separately for each wavelength supported by the ONU.
  • the size of the data to be transmitted corresponding to the same position in the j channels is the same.
  • the size of the transmitted data of each j channel is the same, and the size of the encapsulated XGEM frame or MAC frame is also the same.
  • the PHY Frame size completed on the j channels is the same.
  • the PHY Frame size completed on the j channels is the same.
  • PLOAM messages and BWmap entries sent to all ONUs are copied on all channels, ie PLOAM messages and BWmap entries on each wavelength include PLOAM messages and BWmap entries for all wavelengths; or,
  • the PLOAM message and BWmap sent to the ONU supporting the j channel are transmitted on channel 0, channel 1, channel 2... channel j (when the number of channels is equal to the number of wavelengths, here ⁇ 0 , ⁇ 1 , ⁇ 2 and ⁇ j ).
  • the first processing module is further configured to: when the uplink bandwidth is allocated for the ONU, for the ONUs supporting the j channel, the same bandwidth is allocated on the channel 0 to the channel (j-1), and the channel j and the channel are respectively The bandwidth of j+1)...and the corresponding position of channel (i-1) is not allocated.
  • a receiving module is further provided, configured to receive a data frame on a channel supported by the OLT itself, and receive data and/or data according to channel information and/or address information in the data frame and local channel information and/or address information. Fragmentation, and data reassembly of the received data fragments sent by the same ONU in the same time slot;
  • the optical network device shown in FIG. 14 may be disposed in the OLT or may be an independent entity.
  • FIG. 15 is a schematic structural diagram of a second embodiment of an optical network device according to an embodiment of the present invention. As shown in FIG. 15, the method includes at least a second acquiring module and a second processing module.
  • a second acquiring module configured to receive a data frame on channel 0 to channel (j-1);
  • the second processing module is configured to receive data and/or data fragments according to channel information and/or address information in the received data frame and local channel information and/or address information of the ONU, and perform data fragmentation on the received data.
  • j is the number of channels supported by the ONU
  • j is a positive integer greater than or equal to 1
  • j is less than or equal to i
  • i is the number of channels supported by the OLT.
  • the second obtaining module is further configured to: obtain an uplink bandwidth allocated by the OLT on each channel;
  • the second processing module is further configured to: uniformly distribute data in each uplink bandwidth, and not transmit data on other wavelengths that do not obtain bandwidth allocation;
  • the allocation of the uplink bandwidth includes: for the target ONU supporting the j channel, the same bandwidth is allocated on the channel 0 to the channel (j-1), and the channel j, the channel (j+1), and the channel (i-1) are respectively corresponding. The bandwidth of the location is not allocated.
  • the device described in FIG. 15 may be disposed in the ONU or may be an independent entity
  • the size of the data block, the size of the data frame, and the like are only listed as an implementation manner, and those skilled in the art It is to be understood that, in other implementations, the size of the data block, the size of the data frame, and the like may be changed and implemented in other implementations, and is not intended to limit the scope of the present invention.
  • 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 particular hardware and software. Combine.
  • the passive optical network architecture and the data transmission method and the optical network device provided by the embodiments of the present invention implement the control of the ONU supporting multiple wavelengths and the ONUs supporting different wavelengths and wavelengths, and realize flexible binding of the channels, and fully Take advantage of bandwidth.

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Abstract

L'invention concerne une architecture de réseau optique passif, un procédé permettant à une architecture de réseau optique passif d'exécuter une transmission de données, et un dispositif de réseau optique. L'architecture comprend un terminal de ligne optique (OLT) prenant en charge une pluralité de canaux, et une ou plusieurs unités de réseau optique (ONU) prenant en charge un ou plusieurs canaux et situés sous un même réseau de distribution optique (ODN). L'OLT/les ONU sont configurés pour obtenir le nombre de canaux prenant en charge la transmission de données et/ou les canaux correspondants et un état d'envoi des canaux de prise en charge et attribuer des données devant être transmises, à un ou plusieurs des canaux de prise en charge pour une transmission, les données étant de préférence transmises sur le canal ayant l'heure de début d'envoi le plus précoce, et une heure de fin d'envoi sur le canal transmettant les données étant proche ou se terminant à une heure de fin d'envoi. Les ONU/l'OLT sont configurés pour recevoir des données sur des canaux pris en charge par eux-mêmes, et réassembler alors les données selon une règle d'envoi. La présente invention permet à un OLT prenant en charge une pluralité de longueurs d'onde de commander des ONU prenant en charge différents nombres de longueur d'onde et différentes longueurs d'onde, implémente une liaison de canal flexible, et utilise pleinement la largeur de bande.
PCT/CN2016/086906 2016-04-14 2016-06-23 Architecture de réseau optique passif, procédé permettant à une architecture de réseau optique passif d'exécuter une transmission de données, et dispositif de réseau optique WO2017177549A1 (fr)

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