LTZOO60US (l903944CN08-US)
`SUBSTITUTE SPECIFICATION — MARKED COPY
`
`PASSIVE OPTICAL NETWORK SYSTEM AND IMPLEMENTATION METHOD THEREOF
`
`CROSS-REFERENCE TO RELATED APPLICATIONS
`
`
`This is a continuation application under 35 U.S.C. § 371 of PCT Application No.
`[0001]
`
`PCT/CN2017/ 111302 filed on November 16 2017 which is based upon and claims priority to
`
`Chinese Patent Application 2016110968605, filed on December 2, 2016, the whole contents thereof
`
`are incorporated herein by reference.
`
`TECHNICAL FIELD
`
`[0002]
`
`The present disclosure relates to passive optical network technologies, and more
`
`particularly to a passive optical network (PON) system and an implementation method thereof.
`
`BACKGROUND
`
`[0003]
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`Traditional network architecture of passive optical network is shown in Fig. 1. The
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`channel between the optical line terminal (0LT) and the optical network unit (ONU) transmits both
`
`data and management information, that is, the OLT and the GNU communicate through one channel.
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`With the development of mobile networks, passive optical networks have gradually become one of
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`the bearer technologies for mobile pre-transmission, mobile backhaul, sensor networks, and in-
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`vehicle networks. When these network services are used, the transmission delay requirements for
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`mobile networks and even passive optical networks as carriers are very strict.
`
`[0004]
`
`Transmission delays in passive optical networks comprise: optical transmission delay,
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`delay caused by opening quiet window, bandwidth allocation delay, and the like. Wherein the
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`optical transmission delay is relevant to the distance of optical fiber, and transmission time for
`
`20KM is about lOOus. Opening quiet window is for OLT discovery, ranging ONU, as shown in Fig.
`
`2, and is belong to an expense of channel connection initialization between the OLT and ONU. In
`
`order to find an ONU that is at most 20KM away from the OLT, it is necessary to open a quiet
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`window of 200 microseconds, during which the normally operating ONU cannot communicate
`
`normally with the OLT. On the other hand, in order to realize the rapid discovery of the GNU, the
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`OLT needs to periodically open a quiet window to discover the GNU. The period is related to the
`
`actual application. If the GNU is required to register the GNU at the seconds level, the period
`
`should be the seconds level, that is, a quiet window of 200 microseconds at maximum must be
`
`opened in every seconds, since the quiet window is for the GNU to be registered and activated to
`
`transmit uplink signals, while the other ONUs which have been registered and activated and is
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`

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`LTZOO60US (l903944CN08-US)
`SUBSTITUTE SPECIFICATION — MARKED COPY
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`normally working cannot transmit uplink signals in the quiet window. If a normally working ONU
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`has uplink data to be sent at the beginning of the quiet window, it must wait for the quiet window to
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`end before it has the opportunity to send the uplink data. In this case, the uplink data sent by the
`
`working ONU may cause a maximum of 200 microseconds delay. In the related art, when the OLT
`
`performs ranging to the GNU, it is also necessary to open a quiet window. However, when the OLT
`
`finds the GNU, the OLT can estimate the distance between the OLT and the GNU, that is, the OLT
`
`can estimate the arrival time of response that the OLT ranges to the GNU, and the quiet window for
`
`ranging is used exclusively for the GNU to be measured. It does not require multiple ONUs to
`
`compete, so a quiet window opened for ranging can be smaller than an opened quiet window that is
`
`found for the GNU. The delay for a working ONU is also small.
`
`[0005]
`
`On the other hand,
`
`in traditional passive optical network systems, the bandwidth
`
`allocation is done generally based on the ONU’s bandwidth request or the OLT’s own detection of
`
`the GNU traffic, that is, dynamic bandwidth allocation. This bandwidth allocation method can
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`achieve high bandwidth utilization, but there is a certain lag in a process of bandwidth allocation,
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`and bring greater delay when the PON carries low latency services. Taking bandwidth allocation
`
`based on ONU bandwidth request as an example, as shown in Fig. 3, from user data arriving at the
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`GNU until the GNU sending the user data to the OLT, there are following processes: the GNU
`
`requesting the bandwidth to the OLT according to the user data, the OLT inputting ONU bandwidth
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`request to a DBA algorithm engine and obtaining a the process of obtaining a bandwidth allocation
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`result from the DBA algorithm engine, the OLT transmitting the bandwidth allocation result to the
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`GNU, and the GNU transmitting the user data at the determined time. The delays caused by the
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`foregoing operations
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`comprise ONU preparation bandwidth request
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`time TDBRu, uplink
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`transmission delay TPROGu, bandwidth allocation calculation time TDBA, downstream
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`transmission delay TPROGd, transmission time offset TOFF, wherein in a case that the fiber has a
`
`20KM length, uplink transmission delay and downlink transmission delay are 100 microseconds,
`
`respectively, and bandwidth allocation method based on bandwidth request will at least bring a 200
`
`microseconds delay to the uplink data transmission.
`
`|0006|
`
`In order to reduce the transmission delay of the PON system, at least one of the
`
`above problems must be solved, and the above problems need to be solved in order for the PON
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`system to carry services with high delay requirements such as mobile preamble, mobile backhaul,
`
`sensor network, and in— vehicle network.
`
`{0006}|0007 | This section provides background information related to the present disclosure which
`
`is not necessarily prior art.
`
`

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`LTZOO60US (l903944CN08-US)
`SUBSTITUTE SPECIFICATION — MARKED COPY
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`SUMMARY
`
`{0007-}|0008|
`
`In order to solve the above technical problems, the present disclosure provides a
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`PON system and an implementation method thereof, which can reduce the transmission delay of a
`
`passive optical network system.
`
`{0008}|0009|
`
`In order to achieve the object of the present disclosure,
`
`the present disclosure
`
`provides an implementation method of a PON system, wherein a first transmission channel and a
`
`second transmission channel are provided between an 0LT and an ONU in the PON system, and the
`
`method comprises:
`
`{0009}|0010|
`
`the 0LT transmits data over the first transmission channel,
`
`{001-0}|0011|
`
`the 0LT transmits, over an uplink channel of the second transmission channel, all of
`
`uplink management information, or
`
`{001—1-}|0012|
`
`the 0LT transmits, over the uplink channel of the second transmission channel, a part
`
`of the uplink management
`
`information, and transmits, over an uplink channel of the first
`
`transmission channel, remaining uplink management information other than the part of the uplink
`
`management information transmitted over the uplink channel of the second transmission channel.
`
`{001—2}|0013|
`
`In an embodiment, the method further comprises:
`
`{001%}|0014|
`
`the 0LT transmits, over a downlink channel of the first transmission channel or a
`
`downlink channel of the second transmission channel, all downlink management information, or
`
`{0014}|0015|
`
`the 0LT transmits, over the downlink channel of the second transmission channel, a
`
`part of
`
`the downlink management information, and transmits, over the downlink channel of the
`
`first transmission channel, remaining downlink management information other than the part of the
`
`downlink management
`
`information transmitted over
`
`the downlink channel of the second
`
`transmission channel.
`
`{0015}|0016|
`
`In an embodiment, the management information includes but is not limited to the
`
`following information:
`
`{0&16}|0017| management information in an optical network unit ONU discovering process,
`
`{0014-}|0018| management information in an ONU ranging process,
`
`{0018}|0019| management information in bandwidth allocation,
`
`{001—9}|0020| optical network unit management control
`
`interface OMCI information, operation
`
`management and maintenance 0AM information,
`
`{0020}|0021| physical
`
`layer operation management and maintenance PLOAM information and
`
`multipoint control protocol MP CP information.
`
`{0021-}l0022l
`
`In an embodiment, a standard of the second transmission channel is different from or
`
`identical to a standard of the first transmission channel, or
`
`

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`LTZOO60US (l903944CN08-US)
`SUBSTITUTE SPECIFICATION — MARKED COPY
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`{002—2-}|0023| when the first transmission channel comprises a subchannel, the standard of the
`
`second transmission channel is the same as the standard of the subchannel of the first transmission
`
`channel; or
`
`WMwhen the first transmission channel comprises a plurality of subchannels, the second
`
`transmission channel is a subchannel in the first transmission channel for the OLT to transmit all or
`
`a part of the management information; remaining subchannels in the first transmission channel are
`
`used for the OLT to transmit data, or transmit the data and remaining management information
`
`other than the part of the management information transmitted to the OLT.
`
`{0024mm an embodiment, the method further comprises:
`
`WMthe OLT allocates periodic bandwidths for the GNU according to characteristics of
`
`service carried on the PON system, and a spacing between two adjacent bandwidths is less than or
`
`equal to a fixed value T.
`
`WMIn an embodiment, the fixed value T is:
`
`WMa difference value between a time tl when traffic data arrives at the GNU and a time
`
`t2 when the GNU transmits processed traffic data to the 0LT, and a time when the GNU processes
`
`traffic data is an upper time limit that the GNU processes traffic data, which is required to ensure
`
`completion of the service.
`
`{WMAn embodiment of the disclosure further provides an implementation method of a
`
`PON system, comprising:
`
`WMan OLT allocates periodic bandwidths for an ONU according to characteristics of
`
`service carried on the PON system, and a spacing between two adjacent bandwidths is less than or
`
`equal to a fixed value T.
`
`WMIn an embodiment, the fixed value T is:
`
`WMa difference value between a time tl when traffic data arrives at the GNU and a time
`
`t2 when the GNU transmits processed traffic data to the 0LT, and a time when the GNU processes
`
`traffic data is an upper time limit that the GNU processes traffic data, which is required to ensure
`
`completion of the service.
`
`mmin an embodiment, a first transmission channel and a second transmission channel
`
`are provided between an OLT and an ONU in the PON system; and the method comprises:
`
`WMLthe OLT transmits data over the first transmission channel,
`
`WMthe OLT transmits, over an uplink channel of the second transmission channel, all of
`
`uplink management information, or
`
`WMLthe OLT transmits, over the uplink channel of the second transmission channel, a part
`
`of the uplink management
`
`information, and transmits, over an uplink channel of the first
`
`

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`LTZ0060US (l903944CN08-US)
`SUBSTITUTE SPECIFICATION — MARKED COPY
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`transmission channel, remaining uplink management information other than the part of the uplink
`
`management information transmitted over the uplink channel of the second transmission channel.
`
`{0036“0037 |
`
`In an embodiment, the method further comprises:
`
`{0037-}|0038|
`
`the 0LT transmits, over a downlink channel of the first transmission channel or a
`
`downlink channel of the second transmission channel, all downlink management information, or
`
`{0038}|0039|
`
`the 0LT transmits, over the downlink channel of the second transmission channel, a
`
`part of
`
`the downlink management information, and transmits, over the downlink channel of the
`
`first transmission channel, remaining downlink management information other than the part of the
`
`downlink management
`
`information transmitted over
`
`the downlink channel of the second
`
`transmission channel.
`
`{0039}|0040|
`
`In an embodiment, the management information includes but is not limited to the
`
`following information:
`
`{0040}|0041| management information in an optical network unit ONU discovering process,
`
`{0041-}|0042| management information in an ONU ranging process,
`
`{0042}|0043| management information in bandwidth allocation,
`
`{0043}|0044| optical network unit management control
`
`interface OMCI information, operation
`
`management and maintenance 0AM information,
`
`{0044}|0045| physical
`
`layer operation management and maintenance PLOAM information and
`
`multipoint control protocol MP CP information.
`
`{0045}|0046|
`
`In an embodiment, a standard of the second transmission channel is different from or
`
`identical to a standard of the first transmission channel, or
`
`{0046}|0047| when the first transmission channel comprises a subchannel, the standard of the
`
`second transmission channel is the same as the standard of the subchannel of the first transmission
`
`channel, or
`
`{0047-}|0048| when the first transmission channel comprises a plurality of subchannels, the second
`
`transmission channel is a subchannel in the first transmission channel for the 0LT to transmit all or
`
`a part of the management information, remaining subchannels in the first transmission channel are
`
`used for the 0LT to transmit data, or transmit the data and remaining management information
`
`other than the part of the management information transmitted to the 0LT.
`
`{0048}|0049| An embodiment of the disclosure further provides a passive optical network PON
`
`system, a first transmission channel and a second transmission channel are provided between an
`
`optical line terminal 0LT and an optical network unit ONU in the PON system, and wherein,
`
`{0049}|0050|
`
`the first transmission channel is configured to transmit data by the 0LT,
`
`{0050}|0051| an uplink channel of the second transmission channel is configured to transmit all of
`
`

`

`LTZOO60US (l903944CN08-US)
`SUBSTITUTE SPECIFICATION — MARKED COPY
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`uplink management information by the 0LT; or
`
`{0051-}|0052| an uplink channel of the first
`
`transmission channel
`
`is configured to transmit
`
`remaining uplink management
`
`information other
`
`than the part of the uplink management
`
`information transmitted over the uplink channel of the second transmission channel by the 0LT;
`
`{0052}|0053|
`
`the uplink channel of the second transmission channel is configured to transmit a
`
`part of uplink management information by the 0LT.
`
`{0053}|0054|
`
`In an embodiment, a downlink channel of the first transmission channel or a
`
`downlink channel of the second transmission channel are also used by the 0LT to transmit all of
`
`downlink management information; or
`
`{0054—}|0055|
`
`the downlink channel of the second transmission channel is also used by the 0LT to
`
`transmit a part of downlink management information;
`
`{0055}|0056|
`
`the downlink channel of the first transmission channel is also used by the 0LT to
`
`transmit
`
`remaining downlink management
`
`information other
`
`than the part of the downlink
`
`management
`
`information transmitted over the downlink channel of the second transmission
`
`channel.
`
`{0056}|0057|
`
`In an embodiment, the management information includes but is not limited to the
`
`following information:
`
`{0057-}|0058| management information in an optical network unit ONU discovering process;
`
`{0058}|0059| management information in an ONU ranging process;
`
`{0059}|0060| management information in bandwidth allocation;
`
`{0060}|0061| optical network unit management control
`
`interface OMCI information; operation
`
`management and maintenance 0AM information;
`
`{0061-}|0062| physical
`
`layer operation management and maintenance PLOAM information and
`
`multipoint control protocol MP CP information.
`
`{0062-}|0063|
`
`In an embodiment; a standard of the second transmission channel is different from or
`
`identical to a standard of the first transmission channel; or
`
`{0063}|0064| when the first transmission channel comprises a subchannel; the standard of the
`
`second transmission channel is the same as the standard of the subchannel of the first transmission
`
`channel; or
`
`{0064}|0065| when the first transmission channel comprises a plurality of subchannels; the second
`
`transmission channel is a subchannel in the first transmission channel for the 0LT to transmit all or
`
`a part of the management information; remaining subchannels in the first transmission channel are
`
`used for the 0LT to transmit data; or transmit the data and remaining management information
`
`other than the part of the management information transmitted to the 0LT.
`
`

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`LTZOO60US (l903944CN08-US)
`SUBSTITUTE SPECIFICATION — MARKED COPY
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`{0065}|0066|
`
`In an embodiment, the OLT is also used to allocate periodic bandwidths for the GNU
`
`according to characteristics of service carried on the PON system, and a spacing between two
`
`adjacent bandwidths is less than or equal to a fixed value T.
`
`mamrn an embodiment,
`
`the fixed value T is:
`
`WMa difference value between a time t1 when traffic data arrives at the GNU and a time
`
`t2 when the GNU transmits processed traffic data to the OLT, and a time when the GNU processes
`
`traffic data is an upper time limit that the GNU processes traffic data, which is required to ensure
`
`completion of the service.
`
`WMAn embodiment of the disclosure further provides a PON system, wherein an OLT in
`
`the system is configured to allocate periodic bandwidths for an ONU according to characteristics of
`
`service carried on the PON system, and a spacing between two adjacent bandwidths is less than or
`
`equal to a fixed value T.
`
`WMIn an embodiment, the fixed value T is:
`
`WMa difference value between a time t1 when traffic data arrives at the GNU and a time
`
`t2 when the GNU transmits processed traffic data to the OLT, and a time when the GNU processes
`
`traffic data is an upper time limit that the GNU processes traffic data, which is required to ensure
`
`completion of the service.
`
`{WMIn an embodiment, a first transmission channel and a second transmission channel
`
`are provided between an OLT and an ONU in the PON system, and wherein,
`
`Mmme first transmission channel is configured to transmit data by the 0LT,
`
`WMan uplink channel of the second transmission channel is configured to transmit all of
`
`uplink management information by the 0LT, or
`
`{WMan uplink channel of the first
`
`transmission channel
`
`is configured to transmit
`
`remaining uplink management
`
`information other
`
`than the part of the uplink management
`
`information transmitted over the uplink channel of the second transmission channel by the 0LT,
`
`WMthe uplink channel of the second transmission channel is configured to transmit a
`
`part of uplink management information by the OLT.
`
`WMIn an embodiment, a downlink channel of the first transmission channel or a
`
`downlink channel of the second transmission channel are also used by the OLT to transmit all of
`
`downlink management information, or
`
`Mmme downlink channel of the second transmission channel is also used by the OLT to
`
`transmit a part of downlink management information,
`
`WMthe downlink channel of the first transmission channel is also used by the OLT to
`
`transmit
`
`remaining downlink management
`
`information other
`
`than the part of the downlink
`
`

`

`LTZOO60US (l903944CN08-US)
`SUBSTITUTE SPECIFICATION — MARKED COPY
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`management
`
`information transmitted over the downlink channel of the second transmission
`
`channel.
`
`{0017—9}|0080|
`
`In an embodiment, the management information includes but is not limited to the
`
`following information:
`
`{0080}|0081| management information in an optical network unit ONU discovering process;
`
`{0081-}|0082| management information in an ONU ranging process;
`
`{0082}|0083| management information in bandwidth allocation;
`
`{0083}|0084| optical network unit management control
`
`interface OMCI information; operation
`
`management and maintenance 0AM information;
`
`{0084—}|0085| physical
`
`layer operation management and maintenance PLOAM information and
`
`multipoint control protocol MP CP information.
`
`{0085}|0086|
`
`In an embodiment; a standard of the second transmission channel is different from or
`
`identical to a standard of the first transmission channel; or
`
`{0086}|0087| when the first transmission channel comprises a subchannel; the standard of the
`
`second transmission channel is the same as the standard of the subchannel of the first transmission
`
`channel; or
`
`{0087—}|0088| when the first transmission channel comprises a plurality of subchannels; the second
`
`transmission channel is a subchannel in the first transmission channel for the 0LT to transmit all or
`
`a part of the management information; remaining subchannels in the first transmission channel are
`
`used for the 0LT to tranth data; or transmit the data and remaining management information
`
`other than the part of the management information transmitted to the 0LT.
`
`{0088}|0089| Comparing with the prior art;
`
`in the embodiments of the disclosure; a first
`
`transmission channel and a second transmission channel are provided between an optical
`
`line
`
`terminal (0LT) and an optical network unit (ONU) in the PON system; and the method comprises:
`
`the 0LT transmits data over the first transmission channel;
`
`the 0LT transmits; over an uplink
`
`channel of the second transmission channel; all of uplink management information; or the 0LT
`
`transmits; over the uplink channel of the second transmission channel; a part of the uplink
`
`management information; and transmits; over an uplink channel of the first transmission channel;
`
`remaining uplink management
`
`information other
`
`than the part of the uplink management
`
`information transmitted over the uplink channel of the second transmission channel. In the present
`
`disclosure; a part of or all of the management information is interacted on management channels
`
`such that the bandwidth occupied by the management
`
`information interaction is peeled from
`
`original data channel; so that bandwidth utilization the original data channel is higher; and delay of
`
`sending data is smaller and more controllable.
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`

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`LTZOO60US (l903944CN08-US)
`SUBSTITUTE SPECIFICATION — MARKED COPY
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`{0089}|0090| The embodiments of the disclosure further comprise:
`
`the 0LT allocates periodic
`
`bandwidths for the GNU according to characteristics of service carried on the PON system, and a
`
`spacing between two adjacent bandwidths is less than or equal to a fixed value T. It can be seen that
`
`bandwidth allocation of the present disclosure is no longer dependent on bandwidth request of the
`
`GNU or the 0LT monitoring traffic of the GNU, further reducing delay that the GNU sends data.
`
`|0091|
`
`Other features and advantages of the disclosure will be set forth in the description
`
`which follows, and will be partially apparent from the description, or will be understood by
`
`implementing the disclosure. The objectives and other advantages of the disclosure may be realized
`
`and obtained by means of the structure particularly pointed in the description, the appended claims,
`
`and the drawings.
`
`{0090}|0092| This section provides a summary of various implementations or examples of the
`
`technology described in the disclosure, and is not a comprehensive disclosure of the filll scope or all
`
`features of the disclosed technology.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`WMThe drawings provide a further understanding of aspects of the present disclosure,
`
`constitute a part of the specification, serve to explain the technical solution of the present disclosure
`
`together with embodiments of the disclosure, and will not limit the technical solution of the present
`
`disclosure.
`
`WMFi g. l is a schematic view of a conventional passive optical network architecture,
`
`WMFig. 2 is a schematic view showing that a quiet window influences a working ONU
`
`in an ONU registration process,
`
`{WMFig 3 is a schematic view of a delay caused by bandwidth allocation based on a
`
`bandwidth request,
`
`{OOQSHMLFig 4 is an example of mobile pre-transmission architecture applying a PON,
`
`WMFig. 5 is a first schematic view of implementation method process of the PON
`
`system of an embodiment of the present disclosure,
`
`WMFig. 6 is a second schematic view of implementation method process of the PON
`
`system of an embodiment of the present disclosure,
`
`{WMFig 7 is a schematic view of the PON architecture of an embodiment of the present
`
`disclosure,
`
`WMFig. 8 is a third schematic view of implementation method process of the PON
`
`system of an embodiment of the present disclosure,
`
`W|00102| Fig. 9 is a fourth schematic view of implementation method process of the PON
`
`

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`LTZOO60US (l903944CN08-US)
`SUBSTITUTE SPECIFICATION — MARKED COPY
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`system of an embodiment of the present disclosure;
`
`{001-01-}|00103| Fig. 10 is a schematic View of a structure of the PON system of an embodiment of
`
`the present disclosure;
`
`{001-02}|00104| Fig. 11 is a schematic View of a working principle and process of LD-PON of a
`
`first embodiment of the present disclosure;
`
`{001-03}|00105| Fig. 12 is a schematic View of a working principle and process of LD-PON of a
`
`second embodiment of the present disclosure;
`
`{001-04}|00106| Fig. 13 is a schematic View showing that an OLT allocates periodic bandwidths
`
`for single ONU under the 10GGPON standard;
`
`{001-05}|00107| Fig. 14 is a schematic View showing that the OLT allocates periodic bandwidths
`
`for a multi-channel ONU under the multi-channel NG—PON2 standard;
`
`{001-06-}|00108| Fig. 15 is a schematic View of the bandwidth allocation method in 10GGPON;
`
`{001-017-}|00109| Fig. 16 is a schematic View of the bandwidth allocation in a channel bonding
`
`system such as multi-channel NG—PON2/40GGPON/100GPON and the like;
`
`{001-08}|00110| Fig. 17 is a schematic View showing that an OLT allocates periodic bandwidths
`
`for single ONU under the 10GGPON standard;
`
`{00109}|00111| Fig. 18 is a schematic View showing that the OLT allocates periodic bandwidths
`
`for a multi-channel ONU under the multi-channel NG—PON2 standard;
`
`{001—10-}|00112| Fig. 19 is a schematic View of the bandwidth allocation in 10GGPON;
`
`{001—1—H|00113| Fig. 20 is a schematic View of the bandwidth allocation in a channel bonding
`
`system such as multi-channel NG—PON2/40GGPON/100GPON and the like.
`
`DETAILED DESCRIPTION
`
`{001—1—2—}|00114|
`
`In order to make the objects; technical solutions and advantages of the present
`
`invention more clear; the embodiments of the present disclosure will be described in detail below
`
`with reference to the accompanying drawings. It should be noted that; in the case of no conflict; the
`
`features in the embodiments and the embodiments in the present application may be arbitrarily
`
`combined with each other.
`
`{001—13}|00115| The steps illustrated in the flowchart of the drawings may be executed in a
`
`computer system such as a set of computer executable instructions. Also; although logical
`
`sequences are shown in the flowcharts;
`
`in some cases;
`
`the steps shown or described may be
`
`performed in a different order than the ones described herein.
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`{001—14}|00116| Based on the background technology; the transmission delay is briefly described
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`in conjunction with a mobile pre-transmission architecture applying a PON. Based on consideration
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`SUBSTITUTE SPECIFICATION — MARKED COPY
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`of functional separation, a traditional base station is divided into a remote unit (RU) and a central
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`unit (CU). The PON can be used as a good system and technology for connecting RU and CU
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`because the PON can be reduced optical fiber deployment, as shown in Fig. 4. In LTE and its
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`evolution system, it is required that a total delay between the CU and a user equipment (UE) is less
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`than 10ms, and the total delay comprises a propagation delay between the CU and RU, as well as a
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`processing delay of every device, and it is required that a transmission delay between the CU and
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`the RU is less than 250us. On the other hand, in a 5G mobile system, it is required that the overall
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`delay is less than 4ms. For the enhanced mobile broadband (eMBB) service, the transmission delay
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`between the CU and the RU is required to be less than 100us, and the processing delays of an OLT
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`and an ONU are less than 10us. Based on the strict requirements of the mobile network for the
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`transmission delay, the embodiment of the present disclosure provides the following solutions:
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`{001—15}|00117| An embodiment of the disclosure provides an implementation method of a PON
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`system, wherein a first transmission channel and a second transmission channel are provided
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`between an optical line terminal 0LT and an optical network unit ONU in the PON system, as
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`shown in Figs. 5 and 6 the method comprises:
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`{OOHGWOI 18|
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`step 501 a: the 0LT transmits data over the first transmission channel,
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`{00H—‘7—}|00119|
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`step 502a: the 0LT transmits, over an uplink channel of the second transmission
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`channel, all of uplink management information.
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`{GOES}|00120|
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`step 501b: the 0LT transmits, over the uplink channel of the second transmission
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`channel, a part of the uplink management information,
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`{-00-1—1—9}|00121|
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`step 502b: an uplink channel of the first transmission channel transmits remaining
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`uplink management
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`information other than the part of the uplink management
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`information
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`transmitted over the uplink channel of the second transmission channel.
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`{001—2-0H00122l Here,
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`it should be noted that the execution order of steps 501 and 502 is not
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`limited, and the order of the labels is merely for convenience of description.
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`{001—21-}|00123| The disclosure puts some or all of the interaction of the management information
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`on the management channel, so that the bandwidth occupied by the interaction of the management
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`information is stripped from the original data channel, so that the bandwidth utilization of the
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`original data channel is higher, and the delay of sending data is smaller and more controllable.
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`{001—2—2—}|00124| Optionally, the method fiirther comprises:
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`the 0LT transmits, over a downlink
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`channel of the first transmission channel or a downlink channel of the second transmission channel,
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`all downlink management information, or
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`{001—23}WOIZS|
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`the 0LT transmits, over the downlink channel of the second transmission channel,
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`a part of
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`the downlink management information, and transmits, over the downlink channel of the
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`LTZOO60US (l903944CN08-US)
`SUBSTITUTE SPECIFICATION — MARKED COPY
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`first transmission channel, remaining downlink management information other than the part of the
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`downlink management
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`information transmitted over
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`the downlink channel of the second
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`transmission channel.
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`{001—24}l00126|
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`It should be noted that when the downlink channel of the second transmission
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`channel is consistent with the downlink channel of the first transmission channel (for example, the
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`wavelengths are the same), data and management information are transmitted; when inconsistent,
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`only management information is transmitted.
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`{001—25}|00127|
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`In actual application, an additional management channel
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`(i.e.,
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`the second
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`transmission channel) may be established on the basis of the original PON architecture, and the
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`additional management channel adopts at least a different uplink wavelength from other original
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`channel (i.e., the first transmission channel) (i.e., downstream wavelength may be identical to other
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`original channels). Further, a standard which is the same as or different from that of the original
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`channels in original PON architecture is used for carrying part or all of the management information
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`between the OLT and the GNU, and other interactions between the OLT and the GNU are still
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`performed on the original data channel. As shown in Fig. 7, the solid line channel is the original
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`data channel, the broken line channel is the new additional management channel.
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`{001—26}WOIZS|
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`In an embodiment of the disclosure, the management information includes but is
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`not limited to the following information:
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`{001—217-}|00129| management information in an ONU discovering process,
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`{001—28}|00130| management information in an ONU ranging process,
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`{001—29}WO 131| management information in bandwidth allocation,
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`{001%0}|00132| optical network unit management control interface (OMCI) information, operation
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`management and maintenance (0AM) information,
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`{00131-}|00133| physical layer operation management and maintenance (PLOAM) information and
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`multipoint control protocol (MPCP) information.
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`W|00134|
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`In an embodiment, a standard of the second transmission channel is different from
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`or identical to a standard of the first transmission channel, or
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`{00133}|00135| when the first transmission channel comprises a subchannel, the standard of the
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`second transmission channel is the same as the standard of the subchannel of the first transmission
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`channel, or
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`{001%4}|00136| when the first transmission channel comprises a plurality of subchannels,
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`the
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`second transmission channel
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`is a subchannel
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`in the first transmission channel for the 0LT to
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`tran