WO2018120178A1 - 数据通信系统、光线路终端及基带单元 - Google Patents

数据通信系统、光线路终端及基带单元 Download PDF

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Publication number
WO2018120178A1
WO2018120178A1 PCT/CN2016/113857 CN2016113857W WO2018120178A1 WO 2018120178 A1 WO2018120178 A1 WO 2018120178A1 CN 2016113857 W CN2016113857 W CN 2016113857W WO 2018120178 A1 WO2018120178 A1 WO 2018120178A1
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Prior art keywords
time
alloc
onu
onu1
data stream
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PCT/CN2016/113857
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English (en)
French (fr)
Inventor
张伦
万席锋
郑刚
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华为技术有限公司
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Priority to BR112019013564-2A priority Critical patent/BR112019013564B1/pt
Priority to RU2019123829A priority patent/RU2721167C1/ru
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to KR1020197022163A priority patent/KR102308349B1/ko
Priority to JP2019536106A priority patent/JP6841919B2/ja
Priority to EP16905693.4A priority patent/EP3367592B1/en
Priority to CN202110486540.5A priority patent/CN113365163B/zh
Priority to CN201680036062.5A priority patent/CN109075863B/zh
Priority to CA3048928A priority patent/CA3048928A1/en
Priority to PCT/CN2016/113857 priority patent/WO2018120178A1/zh
Priority to ES16905693T priority patent/ES2917948T3/es
Priority to EP21174604.5A priority patent/EP3926859A1/en
Priority to TW106145710A priority patent/TWI725274B/zh
Priority to ARP170103706A priority patent/AR110694A1/es
Priority to US15/862,285 priority patent/US11038617B2/en
Publication of WO2018120178A1 publication Critical patent/WO2018120178A1/zh
Priority to US17/318,334 priority patent/US11652564B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0238—Wavelength allocation for communications one-to-many, e.g. multicasting wavelengths
    • H04J14/0239—Wavelength allocation for communications one-to-many, e.g. multicasting wavelengths in WDM-PON sharing multiple downstream wavelengths for groups of optical network units [ONU], e.g. multicasting wavelengths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0223—Conversion to or from optical TDM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/22—Adaptations for optical transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0064—Arbitration, scheduling or medium access control aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0086—Network resource allocation, dimensioning or optimisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0088—Signalling aspects

Definitions

  • the present application relates to the field of optical communications, and in particular, to a data communication system, an optical line terminal (OLT), and a baseband unit (BBU).
  • OLT optical line terminal
  • BBU baseband unit
  • a passive optical network is a point-to-multipoint network topology. It usually includes an optical line terminal (OLT) at the central office and multiple optical network units at the user end. Network Unit (ONU) and an Optical Distribution Network (ODN) located between the two.
  • OLT optical line terminal
  • ONU Network Unit
  • ODN Optical Distribution Network
  • Dynamic Bandwidth Assignment is a mechanism that can dynamically allocate uplink bandwidth in microsecond or millisecond time intervals.
  • the OLT broadcasts a message (Bandwidth Map, BWMap) message according to the request bandwidth reported by each ONU, so that each ONU transmits data in the time allocated by the OLT through the BWMap message, but due to the current bandwidth
  • the allocation mechanism the average delay of receiving data from the uplink port of the ONU to the PON port of the OLT is more than 300us, or even 1-4 milliseconds ms.
  • the system specifies that the delay from the ONU's upstream port to the OLT's port is within 20 microseconds. Obviously, the current DBA allocation mechanism will cause the delay in the scenario of the mobile bearer to fail to meet the performance requirements of the delay of the service transmission.
  • the first design provides a method of bandwidth allocation, which includes:
  • each optical network unit ONU receives a bandwidth request sent by each optical network unit ONU, where each ONU includes a first ONU1;
  • the BWMap message includes: a first allocation identifier Alloc-ID1, a first time corresponding to the Alloc-ID1; a second allocation identifier Alloc-ID2, a second time corresponding to the Alloc-ID2; the Alloc-ID1 and Alloc-ID2 are allocated to the ONU1 for use;
  • the video data of the ONU1 can allocate the bandwidth authorization twice for transmitting the video data in one cycle, generally one transmission period is 125 microseconds uss, that is, within 125 us seconds, the video data can be It is transmitted twice. If the cycle is 125us, the transmission time corresponding to each T-CONT is 125/6, which is about 21us, that is, the time from the first transmission of the video data to the next transmission of the video data. The interval is 63us. Compared with the existing DBA transmission mechanism, if the ONU1 only transmits the video data once within 125us, the time interval for transmitting the video data next time is 125us.
  • the ONU Need to wait for 125us before making a second transmission. It can be seen that the improvement of the message format of the BWMap in the embodiment of the present application can not only shorten the transmission interval of the service flow of each ONU, but also greatly reduce the transmission delay of the ONU. After experiments, the average transmission of the ONU is known. The delay can be reduced to 20us, which solves the problem that the transmission delay of the PON system is not satisfied when the mobile backhaul is applied, improves the data transmission rate and efficiency, and improves the user satisfaction.
  • the BWMap message further includes: a third allocation identifier Alloc-ID3 and a third time corresponding to the Alloc-ID3; the Alloc-ID3 is used to identify the second ONU2, the third time is used for allocation to the ONU2 for use.
  • the first time includes: a first start time start time 1, a first end time end time 1; and the second time includes: a second start time start Time 2, a second end time end time 2; wherein the start time 1 is used to indicate that the ONU1 transmits a start byte of the first data stream, and the end time 1 is used to indicate that the ONU1 transmits a data stream.
  • the start time 2 is used to indicate that the ONU1 transmits the second data stream
  • the start byte, the second end time end time 2 is used to indicate that the ONU1 transmits the end byte of the second data stream, where the first data stream and the second data stream carry the same type of service stream; or The first data stream and the second data stream carry different types of traffic flows.
  • the location of the Alloc-ID1 in the BWMap message of each period relative to the Alloc-ID2 is fixed.
  • a method for bandwidth allocation comprising:
  • the BWMap message includes: a first allocation identifier Alloc-ID1, a first time corresponding to the Alloc-ID1; a second allocation identifier Alloc-ID2, and the Alloc a second time corresponding to ID2; the Alloc-ID1 and Alloc-ID2 are both assigned to the first ONU1.
  • the video data of the ONU1 can allocate the bandwidth authorization twice for transmitting the video data in one cycle, generally one transmission period is 125 microseconds uss, that is, within 125 us seconds, the video data can be It is transmitted twice. If the cycle is 125us, the transmission time corresponding to each T-CONT is 125/6, which is about 21us, that is, the time from the first transmission of the video data to the next transmission of the video data. The interval is 63us. Compared with the existing DBA transmission mechanism, if the ONU1 only transmits the video data once within 125us, the time interval for transmitting the video data next time is 125us.
  • the ONU Need to wait for 125us before making a second transmission. It can be seen that the improvement of the message format of the BWMap in the embodiment of the present application can not only shorten the transmission interval of the service flow of each ONU, but also greatly reduce the transmission delay of the ONU. After experiments, the average transmission of the ONU is known. The delay can be reduced to 20us, which solves the problem that the transmission delay of the PON system is not satisfied when the mobile backhaul is applied, improves the data transmission rate and efficiency, and improves the user satisfaction.
  • the method further includes:
  • the BWMap message further includes: a third allocation identifier Alloc-ID3 and a third time corresponding to the Alloc-ID3; the Alloc-ID3 is used to identify the first Two ONU2, the third time is used for allocation to the ONU2 for use.
  • the first time includes: a first start time start time 1, a first end time end time 1; and the second time includes: a second start time start time 2, a second end time end time 2; wherein the start time 1 is used to indicate that the ONU1 transmits a start byte of the first data stream, and the end time 1 is used to indicate that the ONU1 transmits a data stream.
  • End byte 2 is used to indicate that the ONU1 transmits a start byte of the second data stream, and the second end time end time 2 is used to instruct the ONU1 to transmit the end byte of the second data stream, where
  • the first data stream and the second data stream carry the same type of service flow; or the first data stream and the second data stream carry different types of service flows.
  • the location of the Alloc-ID1 in the BWMap message of each period relative to the Alloc-ID2 is fixed.
  • an optical line terminal OLT is provided, and the OLT includes:
  • the transceiver is configured to receive a bandwidth request sent by each optical network unit ONU, where each ONU includes a first ONU1; and a bandwidth map BWMap message is sent to each ONU.
  • a processor configured to generate the BWMap message according to the bandwidth requested by the ONU and the bandwidth configured by the ONU, where the BWMap message includes: a first allocation identifier Alloc-ID1, corresponding to the Alloc-ID1 The first time; the second allocation identifier Alloc-ID2, the second time corresponding to the Alloc-ID2; the Alloc-ID1 and the Alloc-ID2 are all allocated for use by the ONU1.
  • the video data of the ONU1 can allocate the bandwidth authorization twice for transmitting the video data in one cycle, generally one transmission period is 125 microseconds uss, that is, within 125 us seconds, the video data can be It is transmitted twice. If the cycle is 125us, the transmission time corresponding to each T-CONT is 125/6, which is about 21us, that is, the time from the first transmission of the video data to the next transmission of the video data. The interval is 63us, compared to the existing DBA transmission mechanism, if ONU1 To transmit the video data only once in 125us, the time interval for transmitting the video data next time is 125us.
  • the ONU1 misses the transmission data, the ONU needs to wait for 125us before performing the second transmission. It can be seen that the improvement of the message format of the BWMap in the embodiment of the present application can not only shorten the transmission interval of the service flow of each ONU, but also greatly reduce the transmission delay of the ONU. After experiments, the average transmission of the ONU is known. The delay can be reduced to 20us, which solves the problem that the transmission delay of the PON system is not satisfied when the mobile backhaul is applied, improves the data transmission rate and efficiency, and improves the user satisfaction.
  • the BWMap message further includes: a third allocation identifier Alloc-ID3 and a third time corresponding to the Alloc-ID3; the Alloc-ID3 is used to identify The second ONU2, the third time is used for allocation to the ONU2 for use.
  • the first time includes: a first start time start time 1, a first end time end time 1; the second time includes: a second start
  • the start time 2 is used to indicate that the ONU1 transmits a start byte of the first data stream, and the end time 1 is used to indicate that the ONU1 transmits a first time.
  • the end byte of the data stream is used to indicate that the ONU1 transmits the start byte of the second data stream, and the second end time end time 2 is used to indicate that the ONU1 transmits the end word of the second data stream.
  • the first data stream and the second data stream carry the same type of service flow; or the first data flow and the second data flow carry different types of service flows.
  • the location of the Alloc-ID1 relative to the Alloc-ID2 in the BWMap message of each period is fixed.
  • the video data of the ONU1 can allocate the bandwidth authorization twice for transmitting the video data in one cycle, generally one transmission period is 125 microseconds uss, that is, within 125 us seconds, the video data can be It is transmitted twice. If the cycle is 125us, the transmission time corresponding to each T-CONT is 125/6, which is about 21us, that is, the time from the first transmission of the video data to the next transmission of the video data. The interval is 63us.
  • the improvement of the message format of the BWMap in the embodiment of the present application can not only shorten the transmission interval of the service flow of each ONU, but also greatly reduce the transmission delay of the ONU.
  • the average transmission of the ONU is known. The delay can be reduced to 20us, which solves the problem that the transmission delay of the PON system is not satisfied when the mobile backhaul is applied, improves the data transmission rate and efficiency, and improves the user satisfaction.
  • an optical network unit ONU is provided, and the ONU includes:
  • a transmitter configured to send a bandwidth request to the optical line terminal OLT
  • a receiver configured to receive a bandwidth map BWMap message returned by the optical line terminal OLT, where the BWMap message includes: a first allocation identifier Alloc-ID1, a first time corresponding to the Alloc-ID1; and a second allocation identifier Alloc-ID2 a second time corresponding to the Alloc-ID2; the Alloc-ID1 and the Alloc-ID2 are both assigned to the first ONU1.
  • the ONU further includes:
  • a processor configured to acquire, according to its own Alloc-ID, a first time and a second time corresponding to the ONU1, instructing the transmitter to transmit data at the first time and the second time;
  • the transmitter is further configured to transmit the first data according to the acquired first time, and transmit the second data according to the second time.
  • the BWMap message further includes: a third allocation identifier Alloc-ID3 and a third time corresponding to the Alloc-ID3; the Alloc-ID3 It is used to identify the second ONU2, and the third time is used for allocation to the ONU2 for use.
  • the first time includes: a first start time start time 1, a first end time end time 1; and the second time includes: second a start time 2, a second end time end time 2; wherein the start time 1 is used to indicate that the ONU1 transmits a start byte of the first data stream, and the end time 1 is used to indicate the ONU1 Transmitting an end byte of a data stream; the start time 2 is used to indicate that the ONU1 transmits a start byte of the second data stream, and the second end time end time 2 is used to instruct the ONU1 to transmit the second data stream.
  • End byte wherein the first data stream and the second data stream carry the same type of service flow; or the first data stream and the second data stream carry different types of service flows.
  • a fourth possible implementation manner is provided, where the location of the Alloc-ID1 in the BWMap message of each period is fixed with respect to the Alloc-ID2.
  • the video data of the ONU1 can allocate the bandwidth authorization twice for transmitting the video data in one cycle, generally one transmission period is 125 microseconds uss, that is, within 125 us seconds, the video data can be It is transmitted twice. If the cycle is 125us, the transmission time corresponding to each T-CONT is 125/6, which is about 21us, that is, the time from the first transmission of the video data to the next transmission of the video data. The interval is 63us. Compared with the existing DBA transmission mechanism, if the ONU1 only transmits the video data once within 125us, the time interval for transmitting the video data next time is 125us.
  • the ONU Need to wait for 125us before making a second transmission. It can be seen that the improvement of the message format of the BWMap in the embodiment of the present application can not only shorten the transmission interval of the service flow of each ONU, but also greatly reduce the transmission delay of the ONU. After experiments, the average transmission of the ONU is known. The delay can be reduced to 20us, which solves the problem that the transmission delay of the PON system is not satisfied when the mobile backhaul is applied, improves the data transmission rate and efficiency, and improves the user satisfaction.
  • a passive optical network system PON including an optical line terminal OLT and an optical network unit ONU, where the OLT is connected to the ONU through an optical distribution network ODN, and the OLT includes the third
  • the OLT involved in the design scheme includes the ONU described in the fourth design described above.
  • the video data of the ONU1 can allocate the bandwidth authorization twice for transmitting the video data in one cycle, generally one transmission period is 125 microseconds uss, that is, within 125 us seconds, the video data can be It is transmitted twice. If the cycle is 125us, the transmission time corresponding to each T-CONT is 125/6, which is about 21us, that is, the time from the first transmission of the video data to the next transmission of the video data. The interval is 63us.
  • the improvement of the message format of the BWMap in the embodiment of the present application can not only shorten the transmission interval of the service flow of each ONU, but also greatly reduce the transmission delay of the ONU.
  • the average transmission of the ONU is known. The delay can be reduced to 20us, which solves the problem that the transmission delay of the PON system is not satisfied when the mobile backhaul is applied, improves the data transmission rate and efficiency, and improves the user satisfaction.
  • FIG. 1 is a system architecture diagram of a data communication system provided by an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a method for bandwidth allocation provided by an embodiment of the present application
  • FIG. 3 shows a BWMap message format provided by an embodiment of the present application
  • FIG. 4 is a diagram showing an allocation period corresponding to a BWMap message provided by an embodiment of the present application
  • FIG. 5 shows a BWMap message format provided by an embodiment of the present application
  • FIG. 6 is a diagram showing an allocation period corresponding to a BWMap message provided by an embodiment of the present application.
  • FIG. 7 shows another BWMap message format provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of an optical line terminal OLT according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of an optical network unit ONU according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of another network device according to an embodiment of the present application.
  • Multiple as referred to herein means two or more. "and/or”, describing the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately.
  • the character "/" generally indicates that the contextual object is an "or" relationship.
  • the passive optical network system 100 includes at least one optical line termination (OLT) 110, a plurality of optical network units (ONUs) 120, and an optical distribution network (ODN) 130.
  • the optical line terminal 110 is connected to the plurality of optical network units 120 in a point-to-multipoint manner through the optical distribution network 130.
  • the optical line terminal 110 and the optical network unit 120 can communicate using a TDM mechanism, a WDM mechanism, or a TDM/WDM hybrid mechanism.
  • the direction from the optical line terminal 110 to the optical network unit 120 is defined as a downlink direction, and the direction from the optical network unit 120 to the optical line terminal 110 is an uplink direction.
  • the passive optical network system 100 can be a communication network that does not require any active devices to implement data distribution between the optical line terminal 110 and the optical network unit 120.
  • the optical line Data distribution between the terminal 110 and the optical network unit 120 can be implemented by passive optical devices (such as optical splitters) in the optical distribution network 130.
  • the passive optical network system 100 may be an Asynchronous Transfer Mode Passive Optical Network (ATM PON) system or a Broadband Passive Optical Network (BPON) system defined by the ITU-T G.983 standard, and an ITU-T G.984 series standard.
  • ATM PON Asynchronous Transfer Mode Passive Optical Network
  • BPON Broadband Passive Optical Network
  • GPON Gigabit Passive Optical Network
  • EPON Ethernet Passive Optical Network
  • WDM PON Wavelength Division Multiplexed Passive Optical Network
  • NGA PON systems such as the XGPON system defined by the ITU-T G.987 series of standards, the 10G EPON system defined by the IEEE 802.3av standard, the TDM/WDM hybrid PON system, etc.
  • the optical line terminations 110 are typically located at a central location (e.g., Central Office, CO) that can collectively manage the plurality of optical network units 120.
  • the optical line terminal 110 may serve as a medium between the optical network unit 120 and an upper layer network (not shown), and forward data received from the upper layer network to the optical network unit 120 as downlink data, and The uplink data received from the optical network unit 120 is forwarded to the upper layer network.
  • the specific structural configuration of the optical line terminal 110 may vary depending on the specific type of the passive optical network 100.
  • the optical line terminal 110 may include an optical transceiver component 200 and a data processing module (The optical transceiver module 200 can convert the downlink data processed by the data processing module into a downlink optical signal, and send the downlink optical signal to the optical network unit 120 through the optical distribution network 130. And receiving the uplink optical signal sent by the optical network unit 120 through the optical distribution network 130, and converting the uplink data signal into an electrical signal and providing the data processing module to the data processing module for processing.
  • the optical transceiver module 200 can convert the downlink data processed by the data processing module into a downlink optical signal, and send the downlink optical signal to the optical network unit 120 through the optical distribution network 130. And receiving the uplink optical signal sent by the optical network unit 120 through the optical distribution network 130, and converting the uplink data signal into an electrical signal and providing the data processing module to the data processing module for processing.
  • the optical network unit 120 can be distributedly disposed at a user-side location (such as a customer premises).
  • the optical network unit 120 may be a network device for communicating with the optical line terminal 110 and a user, and specifically, the optical network unit 120 may serve as an interface between the optical line terminal 110 and the user.
  • the medium for example, the optical network unit 120 may forward the downlink data received from the optical line terminal 110 to the user, and forward the data received from the user to the optical line terminal 110 as uplink data.
  • the specific configuration of the optical network unit 120 may be different depending on the specific type of the passive optical network 100.
  • the optical network unit 120 may include an optical transceiver component 300.
  • the component 300 is configured to receive a downlink data signal sent by the optical line terminal 110 through the optical distribution network 130, and send an uplink data signal to the optical line terminal 110 through the optical distribution network 130.
  • the structure of the optical network unit 120 is similar to that of an optical network terminal (ONT). Therefore, in the solution provided in this application, the optical network unit and the optical network terminal may mutually change.
  • the optical distribution network 130 can be a data distribution system that can include optical fibers, optical couplers, optical multiplexers/demultiplexers, optical splitters, and/or other devices.
  • the optical fiber, optical coupler, optical multiplexer/demultiplexer, optical splitter, and/or other device may be a passive optical device, in particular, the optical fiber, optical coupler, photosynthetic
  • the wave/demultiplexer, optical splitter, and/or other device may be a device that distributes data signals between the optical line terminal 110 and the optical network unit 120 without the need for power support.
  • the optical distribution network 130 may also include one or more processing devices, such as optical amplifiers or relay devices.
  • the optical distribution network 130 may specifically extend from the optical line terminal 110 to the plurality of optical network units 120, but may also be configured in any other point-to-multipoint structure. .
  • the optical transceiver module 200 or 300 may be a pluggable optical transceiver component integrated with an optical signal transceiving and photoelectric conversion function and an OTDR testing function.
  • the optical transceiver component 200 of the optical line terminal 110 is taken as an example, and the optical transceiver
  • the components may include a light emitting module 210, a light receiving module 220, and an OTDR testing module 230.
  • the optical transmitting module 210 is configured to send the downlink data signal to the optical network unit 120 through the optical distribution network 130, and check the optical fiber network and the PON device.
  • the OTDR test signal is modulated to the downlink data signal and output to the optical distribution network 130 according to the OTDR test control signal provided by the OTDR detection module 230.
  • the light receiving module 220 is configured to receive an uplink data signal that is transmitted from the optical network unit 120 and transmitted through the optical distribution network 130, and convert it into an electrical signal by photoelectric conversion and forward it to the optical line terminal 110.
  • the control module or data processing module (not shown) performs processing.
  • the PON system shown in FIG. 1 may be an EPON system or a GPON system, or may be a 10G EPON or a 100G EPON, or may be an XG-PON, an XGS-PON, or a TWDM-PON. This is limited.
  • FIG. 2 is a method for bandwidth allocation, which is applied to the system architecture of FIG. 1 above.
  • the method includes:
  • Each ONU sends a bandwidth map request to the OLT, and requests the OLT to allocate bandwidth, where each ONU includes the first ONU1.
  • the OLT receives a bandwidth request sent by each ONU.
  • the OLT generates a bandwidth map BWMap message according to the bandwidth requested by the ONU and the bandwidth configured by the ONU, where the BWMap message includes: a first allocation identifier (Allocation Identifier, Alloc-ID) 1, and the Alloc- The first time corresponding to the ID1; the second allocation identifier Alloc-ID2, the second time corresponding to the Alloc-ID2; the Alloc-ID1 and the Alloc-ID2 are all allocated for use by the ONU1.
  • Allocation Identifier Alloc-ID
  • the first time includes: a first start time start time 1, a first end time end time 1; the second time includes: a second start time start time 2, a second end time end time 2;
  • the start time 1 is used to indicate that the ONU1 transmits a start byte of the first data stream, and the end time 1 is used to indicate that the ONU1 transmits an end byte of a data stream;
  • Instructing the ONU1 to transmit a start byte of the second data stream, the second end time end time2 is used to instruct the ONU1 to transmit an end byte of the second data stream, where the first data stream and the second data are
  • the flow carries the same type of traffic flow; or the first data flow and the second data flow carry different types of traffic flows.
  • the BWMap message further includes: a third allocation identifier Alloc-ID3 and the The third time corresponding to Alloc-ID3; the Alloc-ID3 is used to identify the second ONU2, and the third time is used for allocation to the ONU2.
  • the BWMap message further includes: a third allocation identifier Alloc-ID3 and a third time corresponding to the Alloc-ID3; the Alloc-ID3 is used to identify the second ONU2, and the third time is used for allocating Used for the ONU2.
  • the BWMap message includes: an allocation identifier Alloc-ID field, a start time Start time (abbreviated as Start) field, and an end time End time (abbreviated as End) field, wherein the Alloc-ID field is used to identify each The Transmission Container (T-CONT) of the ONU, the container for transmitting data by the T-CONT, specifically indicating how many bytes of data streams can be transmitted; the Start time field is used to indicate that the T-CONT carries data. The time corresponding to the start byte; the End time field is used to indicate the time corresponding to the end byte of the T-CONT bearer data.
  • T-CONT The Transmission Container
  • End time field is used to indicate the time corresponding to the end byte of the T-CONT bearer data.
  • the transmission capacity corresponding to each ONU is also pre-configured, according to The transmission rate and the number of data bytes to be transmitted can be used to know the time corresponding to the start byte of the ONU and the time corresponding to the ONU ending the transmission of the byte to be transmitted, here with ITU-T G.984.3 and G.987.3BWMap The description of the fields is consistent and will not be repeated here.
  • the OLT generates a BWMap message including: Alloc-ID 1 is used to identify T-CONT1 assigned to ONU1, and Start time 100 and End time 300 indicate that ONU1 starts transmitting data from the 100th byte and ends transmitting at the 300th byte.
  • the T-CONT1 is used to carry 200 bytes of data capacity
  • the T-CONT1 is used to carry the data of the ONU1
  • the Alloc-ID 2 is used to identify the T-CONT2 assigned to the ONU2
  • the Start time 400 and the End time 500 represent ONU2 starts transmitting data from the 400th byte and ends transmitting data at the 500th byte.
  • the T-CONT2 is used to carry 100 bytes of data capacity, and the T-CONT2 is used to carry data of ONU2; Alloc-ID 3 is used for The T-CONT3 assigned to the ONU3, the Start time 520 and the End time 600 indicate that the ONU3 starts transmitting data from the 520th byte, and ends transmitting data at the 600th byte, and the T-CONT2 is used to carry 80 bytes of data capacity.
  • the T-CONT3 is used to carry the data of the ONU3.
  • the BWMap is different from the implementation of the existing BWMap.
  • the BWMap also includes: Alloc-ID 1 is used to identify the T-CONT1, Start time 700 and the assigned to the ONU1.
  • End time 900 indicates that ONU1 starts transmitting data from the 700th byte.
  • the 900th byte ends the transmission of data.
  • the T-CONT1 is used to carry a data capacity of 200 bytes.
  • the T-CONT1 is used to carry the data of the ONU1; in a BWMap of one cycle, the ONU1
  • the data can be allocated twice in a specified time.
  • the data transmitted by the ONU1 can be data of the same service type or data of different service types.
  • the video data of the ONU1 can pass T-CONT1 and T- CONT2 bears respectively, starts transmitting the video data at the 100th byte, stops transmitting the video data at the 300th byte, starts transmitting the video data again at the 700th byte, and ends the transmission of the video data at the 900th byte.
  • the video data of the ONU1 can be allocated twice the bandwidth for transmitting the video data in one cycle, generally one transmission period is 125 microseconds us, that is, within 125 us seconds, the video data can be transmitted twice. If the cycle is 125us, the transmission time corresponding to each T-CONT is 125/6, which is about 21us, that is, the time interval between the first transmission of the video data and the next transmission of the video data is 63us. Compared with the existing DBA transmission mechanism, if ONU1 wants to transmit the video data only once within 125us, the time interval for transmitting the video data next time is 125us. If the ONU1 misses the transmission data, the ONU needs to wait for 125us before proceeding. Second transmission.
  • the improvement of the message format of the BWMap in the embodiment of the present application can not only shorten the transmission interval of the service flow of each ONU, but also greatly reduce the transmission delay of the ONU.
  • the average transmission of the ONU is known. The delay can be reduced to 20us, which solves the problem that the transmission delay of the PON system is not satisfied when the mobile backhaul is applied, improves the data transmission rate and efficiency, and improves the user satisfaction.
  • the BWMap message may further include: Alloc-ID 4 is used to identify the T-CONT4 allocated to the ONU2, and the Start time 1000 and the End time 1050 indicate that the ONU2 starts transmitting data from the 1000th byte and ends at the 1050th byte.
  • the T-CONT4 is used to carry 50 bytes of data capacity
  • the T-CONT4 is used to carry data of the ONU2; thus, the ONU2 is in a BWMap of one cycle, and the data of the ONU2 can be respectively separated within a specified time.
  • data of the same service type can also be transmitted.
  • video data of ONU2 can be carried by T-CONT1, and the video data is transmitted at the 1000th byte, and the video data is stopped at the 1050th byte; ONU2 It is also possible to start transmitting the Internet data at the 1000th byte and ending the transmission of the Internet data at the 1050th byte.
  • the data of different service types also greatly shortens the transmission time of data of various service types to be transmitted in ONU2, which greatly reduces the data transmission delay of ONU2, and ensures this.
  • the transmission delay of each ONU under the design satisfies the requirement within 20us, improves the data transmission rate and transmission efficiency of various service types, and improves the user satisfaction.
  • the allocation period corresponding to the BWMap message is as shown in FIG. 4 .
  • the allocation period is exemplified by the existing 125 us per cycle, but is not limited to this cycle.
  • the time corresponding to each T-CONT is 125/6, which is about 21us, that is, T-CONT1 transmits data once for about 21us.
  • the ONU1 transmits data to T-CONT1 to the next transmission through T-CONT1.
  • the data interval is 21*3, which is about 63us.
  • the data to be transmitted that can be used to carry the ONU1 to the T-CONT1 in the 125us is twice, that is, compared with the prior art, the transmission time interval of each transmission data for the ONU is from one cycle to the other.
  • the 125us is reduced to 63us, so with this design, the calculated average delay of ONU1 can also be reduced to 20us.
  • the BWMap message generated by the OLT may specifically be the message format shown in FIG. 5, and the difference from FIG. 4 is that the BWMap message format shown in FIG. 5 includes two T-CONT1s assigned to the ONU1.
  • the secondary bandwidth grant may also include a primary bandwidth grant assigned by the OLT to the ONU 2 and the ONU 3 or the ONU 4 .
  • the BWMap message format can be compatible with the two bandwidth grants allocated for the ONU1 in FIG. 5, and can be compatible with the format of the bandwidth grant for other ONUs in the existing BWMap message. details as follows:
  • Alloc-ID 1 is used to identify T-CONT1 assigned to ONU1.
  • Start time 100 and End time300 indicate that ONU1 starts transmitting data from the 100th byte and ends transmitting data at the 300th byte.
  • the T-CONT1 is used to carry 200 words.
  • the data capacity of the section, the T-CONT1 is used to carry the data of the ONU1;
  • the Alloc-ID 2 is used to identify the T-CONT2 assigned to the ONU2, and the Start time 400 and the End time 500 indicate that the ONU2 starts transmitting data from the 400th byte.
  • the 500th byte ends the transmission of data.
  • the T-CONT2 is used to carry 100 bytes of data capacity
  • the T-CONT2 is used to carry the data of the ONU2
  • the Alloc-ID 3 is used to identify the T-CONT3 assigned to the ONU3
  • Start time 520 and End time 600 indicate that ONU3 starts transmitting data from the 520th byte, and ends transmitting data at the 600th byte.
  • the T-CONT2 is used to carry 80 bytes of data capacity, and the T-CONT3 is used to carry data of the ONU3;
  • the BWMap also includes: Alloc-ID 1 for identifying the T-CONT1 assigned to the ONU1, and the Start time 700 and the End time 900 indicating that the ONU1 starts transmitting data from the 700th byte and ends transmitting data at the 900th byte.
  • the T-CONT1 is used to carry a data capacity of 200 bytes, the T- CONT1 is used to carry the data of the ONU1.
  • the data of the ONU1 can be allocated twice the bandwidth authorization within a specified time.
  • the data transmitted by the ONU1 can be the same service type data or different service types.
  • the video data of ONU1 can be carried by T-CONT1 and T-CONT2 respectively, the video data is transmitted at the 100th byte, the video data is stopped at the 300th byte, and the 700th byte is started again. The video data is transmitted, and the video data is transmitted at the beginning of the 900th byte.
  • the video data of the ONU1 can be allocated twice the bandwidth for transmitting the video data in one cycle, generally one transmission period is 125 microseconds us, that is, within 125 us seconds, the video data can be transmitted twice. If the cycle is 125us, the transmission time corresponding to each T-CONT is 125/6, which is about 21us, that is, the time interval between the first transmission of the video data and the next transmission of the video data is 63us. Compared with the existing DBA transmission mechanism, if ONU1 wants to transmit the video data only once within 125us, the time interval for transmitting the video data next time is 125us. If the ONU1 misses the transmission data, the ONU needs to wait for 125us before proceeding. Second transmission.
  • the improvement of the message format of the BWMap in the embodiment of the present application can not only shorten the transmission interval of the service flow of each ONU, but also greatly reduce the transmission delay of the ONU.
  • the average transmission of the ONU is known. The delay can be reduced to 20us, which solves the problem that the transmission delay of the PON system is not satisfied when the mobile backhaul is applied, improves the data transmission rate and efficiency, and improves the user satisfaction.
  • the BWMap message may further include: Alloc-ID 4 is used to identify the T-CONT4 allocated to the ONU4, and the Start time 1000 and the End time 1050 indicate that the ONU4 starts transmitting data from the 1000th byte and ends at the 1050th byte. Transmitting data, the T-CONT4 is used to carry 50 bytes of data capacity, and the T-CONT4 is used to carry data of the ONU4; thus, the BWMap message can be used to allocate the bandwidth authorization to the ONU1 in one cycle.
  • the bandwidth allocation period for ONU1 is 125us/N
  • the bandwidth allocation period for ONU4 is 125us, which allows the system to support this situation, thereby greatly shortening various service types to be transmitted in each ONU.
  • the data transmission time greatly reduces the data transmission delay of the system, and ensures that the transmission delay of each ONU under this design satisfies the requirement within 20us, improves the data transmission rate and transmission efficiency of various service types, and improves The degree of user satisfaction.
  • the allocation period corresponding to the BWMap message is as shown in FIG. 6.
  • the T-CONT1 is the data carrying the ONU1, and the description corresponding to the bandwidth authorization in the existing DBA allocation mechanism, such as Allco-ID2, is added. Allco-ID3 and Allco-ID4 and Allco-ID5, etc.
  • the allocation period is exemplified by the existing 125 us per cycle, but is not limited to this cycle.
  • the time corresponding to each T-CONT is 125/6, which is about 21us, that is, T-CONT1 transmits data once for about 21us.
  • the ONU1 transmits data to T-CONT1 to the next pass T-CONT1.
  • the time interval for transmitting data is 21*3, which is about 63us.
  • the 125-us can be used for the T-CONT1 to carry the ONU1 to allocate two bandwidth grants, that is, the bandwidth grant time slot is smaller than that of the prior art ONU1, and each transmission of the ONU in one cycle
  • the data transmission time interval is reduced from 125us to 63us, so with this design, the calculated average delay of ONU1 can also be reduced to 20us.
  • another BWMap message format is basically the same as the message format of the above two BWMap frames, and the relative positions of the fields in the message format are also different.
  • FIG. 7 is a format of a downlink frame downlink frame n sent by the OLT to the ONU, including: a frame header header and a payload frame payload of the frame, where the uplink bandwidth map US BWMap message format is located in the downlink nth frame.
  • the header part is as follows:
  • Alloc-ID 1 is used to identify T-CONT1 assigned to ONU1.
  • Start time 100 and End time300 indicate that ONU1 starts transmitting data from the 100th byte and ends transmitting data at the 300th byte.
  • the T-CONT1 is used to carry 200 words.
  • the data capacity of the section, the T-CONT1 is used to carry the data of the ONU1;
  • the Alloc-ID 2 is used to identify the T-CONT2 assigned to the ONU2, and the Start time 400 and the End time 500 indicate that the ONU2 starts transmitting data from the 400th byte.
  • the 500th byte ends the transmission of data.
  • the T-CONT2 is used to carry 100 bytes of data capacity, the T-CONT2 is used to carry the data of the ONU2, and the Alloc-ID 3 is used to identify the T-CONT3 assigned to the ONU3, Start time 520 and End time 600 indicate that ONU3 starts transmitting data from the 520th byte, and ends transmitting data at the 600th byte.
  • the T-CONT2 is used to carry 80 bytes of data capacity, and the T-CONT3 is used to carry data of the ONU3;
  • the BWMap is different from the implementation of the existing BWMap.
  • the BWMap also includes: Alloc-ID 1 is used to identify the T-CONT1 assigned to the ONU1, and the Start time 700 and the End time 900 indicate that the ONU1 starts from the 700th byte.
  • Send data send data at the end of the 900th byte
  • the T-CON T1 is used to carry 200 bytes of data capacity
  • the T-CONT1 is used to carry data of the ONU1; in a BWMap of one cycle, the data of the ONU1 can allocate the bandwidth grant twice in a specified time, and the data transmitted by the ONU1 It can be data of the same service type or data of different service types.
  • the video data of ONU1 can be carried by T-CONT1 and T-CONT2 respectively, and the video data is transmitted at the 100th byte, at the 300th word.
  • the section stops transmitting the video data; the video data is again transmitted at the 700th byte, and the video data is transmitted at the beginning of the 900th byte.
  • the video data of the ONU1 can be allocated twice the bandwidth for transmitting the video data in one cycle, generally one transmission period is 125 microseconds us, that is, within 125 us seconds, the video data can be transmitted twice. If the cycle is 125us, the corresponding transmission of each T-CONT The time is 125/6, which is about 21us, that is, the time interval between the first transmission of the video data and the next transmission of the video data is 63us. Compared with the existing DBA transmission mechanism, if ONU1 is to be within 125us only The video data is transmitted once, and the time interval for transmitting the video data is 125us. If the ONU1 misses the transmission data, the ONU needs to wait for 125us for the second transmission.
  • the improvement of the message format of the BWMap in the embodiment of the present application can not only shorten the transmission interval of the service flow of each ONU, but also greatly reduce the transmission delay of the ONU.
  • the average transmission of the ONU is known. The delay can be reduced to 20us, which solves the problem that the transmission delay of the PON system is not satisfied when the mobile backhaul is applied, improves the data transmission rate and efficiency, and improves the user satisfaction.
  • the BWMap message may further include: Alloc-ID 4 is used to identify the T-CONT4 allocated to the ONU2, and the Start time 1000 and the End time 1050 indicate that the ONU2 starts transmitting data from the 1000th byte and ends at the 1050th byte.
  • the T-CONT4 is used to carry 50 bytes of data capacity
  • the T-CONT4 is used to carry data of the ONU2; thus, the ONU2 is in a BWMap of one cycle, and the data of the ONU2 can be respectively separated within a specified time.
  • data of the same service type can also be transmitted.
  • video data of ONU2 can be carried by T-CONT1, and the video data is transmitted at the 1000th byte, and the video data is stopped at the 1050th byte; ONU2 It is also possible to start transmitting the Internet data at the 1000th byte and ending the transmission of the Internet data at the 1050th byte.
  • the data of different service types also greatly shortens the transmission time of data of various service types to be transmitted in ONU2, which greatly reduces the data transmission delay of ONU2, and ensures this.
  • the transmission delay of each ONU under the design satisfies the requirement within 20us, improves the data transmission rate and transmission efficiency of various service types, and improves the user satisfaction.
  • Alloc-ID1 refers to the T-CONT allocated to ONU1, and in the next cycle, the position of Alloc-ID1 is also relatively fixed, and then improved.
  • the DBA allocation mechanism of the BWMapde message format can reduce the transmission delay between the ONU and the OLT, and improve the transmission efficiency and the transmission rate.
  • the OLT sends the BWMap message to each ONU.
  • the OLT broadcasts the BWMap message to each ONU.
  • the ONU1 receives a bandwidth map BWMap message returned by the optical line terminal OLT.
  • the method may further include:
  • the ONU1 acquires the first time corresponding to the ONU1 according to its own Alloc-ID. And the second time.
  • the OLT allocates an Al loc-ID to each ONU by using a management configuration message in advance, and each ONU receives and stores a respective Al loc-ID.
  • each ONU receives the BWMap message sent by the OLT through the broadcast, each ONU obtains its own ONU's own T-CONT according to its Al loc-ID, and obtains the bandwidth authorization of the T-CONT, that is, obtains the T-CONT corresponding to the T-CONT. first timing.
  • the ONU learns that the ONU has at least two bandwidth grants in a BWMap message in a period according to the lookup Al loc-ID
  • the data is transmitted according to the bandwidth grant time in the message, that is, according to the obtained first Transmitting the first data, and transmitting the second data according to the second time; wherein, the first time corresponds to the start transmission byte and the end transmission byte of the T-CONT bearer data; the second time corresponds to the T-CONT
  • the start and end of the data are carried.
  • the first time and the second time are assigned in an ascending manner.
  • the video data of the ONU1 can be allocated twice the bandwidth for transmitting the video data in one cycle, generally one transmission period is 125 microseconds us, that is, within 125 us seconds, the video data can be transmitted twice. If the cycle is 125us, the transmission time corresponding to each T-CONT is 125/6, which is about 21us, that is, the time interval between the first transmission of the video data and the next transmission of the video data is 63us. Compared with the existing DBA transmission mechanism, if ONU1 wants to transmit the video data only once within 125us, the time interval for transmitting the video data next time is 125us. If the ONU1 misses the transmission data, the ONU needs to wait for 125us before proceeding. Second transmission.
  • the improvement of the message format of the BWMap in the embodiment of the present application can not only shorten the transmission interval of the service flow of each ONU, but also greatly reduce the transmission delay of the ONU.
  • the average transmission of the ONU is known. The delay can be reduced to 20us, which solves the problem that the transmission delay of the PON system is not satisfied when the mobile backhaul is applied, improves the data transmission rate and efficiency, and improves the user satisfaction.
  • An embodiment of the present invention further provides an optical line terminal OLT.
  • the OLT includes:
  • the transceiver 800 is configured to receive a bandwidth request sent by each optical network unit ONU, where each ONU includes a first ONU1; and a bandwidth map BWMap message is sent to each ONU.
  • the processor 802 is configured to generate the BWMap message according to the bandwidth requested by the ONU and the bandwidth configured by the ONU, where the BWMap message includes: a first allocation identifier Alloc-ID1, corresponding to the Alloc-ID1 The first time; the second allocation identifier Alloc-ID2, the second time corresponding to the Alloc-ID2; the Alloc-ID1 and Alloc-ID2 are all allocated for use by the ONU1.
  • the BWMap message further includes: a third allocation identifier Alloc-ID3 and a third time corresponding to the Alloc-ID3; the Alloc-ID3 is used to identify the second ONU2, and the third time is used for allocating Used for the ONU2.
  • the first time includes: a first start time start time 1, a first end time end time 1; the second time includes: a second start time start time 2, a second end time end time 2;
  • the start time 1 is used to indicate that the ONU1 transmits a start byte of the first data stream, and the end time 1 is used to indicate that the ONU1 transmits an end byte of a data stream;
  • Instructing the ONU1 to transmit a start byte of the second data stream, the second end time end time2 is used to instruct the ONU1 to transmit an end byte of the second data stream, where the first data stream and the second data are
  • the flow carries the same type of traffic flow; or the first data flow and the second data flow carry different types of traffic flows.
  • the location of the Alloc-ID1 in the BWMap message of each period is fixed with respect to the Alloc-ID2.
  • the location of the OLT in the PON system architecture is shown in the OLT of FIG. 1.
  • the transceiver 800 may be the optical transceiver component 200 of the OLT 110 in the system architecture, or the transceiver 800 is located in the system architecture. In the optical transceiver assembly 200 of the OLT.
  • the improvement of the message format of the BWMap generated by the OLT in the embodiment of the present application can not only shorten the transmission interval of the service flow of each ONU, but also greatly reduce the transmission delay of the ONU.
  • the average transmission delay of the ONU is known. It can be reduced to 20us, which solves the problem that the transmission delay of the PON system is not satisfied when the mobile backhaul is applied, and the data transmission rate and efficiency are improved. The rate increases user satisfaction.
  • the optical line terminal in FIG. 1 further includes a processor 800 as shown in FIG. 8, which is not shown in the figure.
  • the processor 800 in the figure may be a media access controller. (Media Access Controller, MAC) or other microprocessor.
  • media access controller Media Access Controller, MAC
  • MAC Media Access Controller
  • An embodiment of the present invention further provides an optical network unit ONU.
  • the ONU includes:
  • a transmitter 900 configured to send a bandwidth request to the optical line terminal OLT;
  • the receiver 902 is configured to receive a bandwidth map BWMap message returned by the optical line terminal OLT, where the BWMap message includes: a first allocation identifier Alloc-ID1, a first time corresponding to the Alloc-ID1; and a second allocation identifier Alloc- ID2, a second time corresponding to the Alloc-ID2; the Alloc-ID1 and Alloc-ID2 are both assigned to the first ONU1.
  • the ONU further includes:
  • the processor 904 is configured to acquire, according to its own Alloc-ID, a first time and a second time corresponding to the ONU1, instructing the transmitter to transmit data at the first time and the second time;
  • the transmitter 900 is further configured to transmit the first data according to the acquired first time, and transmit the second data according to the second time.
  • the BWMap message further includes: a third allocation identifier Alloc-ID3 and a third time corresponding to the Alloc-ID3; the Alloc-ID3 is used to identify the second ONU2, and the third time is used for allocating Used for the ONU2.
  • the first time includes: a first start time start time 1, a first end time end time 1; the second time includes: a second start time start time 2, a second end time end time 2;
  • the start time 1 is used to indicate that the ONU1 transmits a start byte of the first data stream, and the end time 1 is used to indicate that the ONU1 transmits an end byte of a data stream;
  • Instructing the ONU1 to transmit a start byte of the second data stream, the second end time end time2 is used to instruct the ONU1 to transmit an end byte of the second data stream, where the first data stream and the second data are
  • the flow carries the same type of traffic flow; or the first data flow and the second data flow carry different types of traffic flows.
  • the location of the Alloc-ID1 in the BWMap message of each period is fixed with respect to the Alloc-ID2.
  • the ONU receives the improved message format of the BWMap, which not only shortens the transmission interval of each ONU service stream, but also greatly reduces the transmission delay of the ONU.
  • the average transmission delay of the ONU is known. It can be reduced to 20us, which solves the problem that the transmission delay of the PON system is not satisfied when the mobile backhaul is applied, improves the data transmission rate and efficiency, and improves the user's satisfaction.
  • optical transceiver assembly 300 of FIG. 1 can include transmitter 900 and receiver 902 of FIG.
  • the transmitter 900 and the receiver 902 can be assembled into one device, such as an optical module, or can be separately provided.
  • the processor 904 is not illustrated in the optical network unit 120 of FIG. 1, but the optical network unit also includes the processor 904.
  • the processor 904 in the figure may be a Media Access Controller (MAC). Or other microprocessors.
  • MAC Media Access Controller
  • a passive optical network system PON includes an optical line terminal OLT and an optical network unit ONU, and the OLT is connected to the ONU through an optical distribution network ODN.
  • OLT 110 refers to the specific OLT.
  • ONU refers to the description of the specific structure of the ONU.
  • functions performed by the OLT and the ONU refer to the description of the above embodiments, and details are not described herein.
  • the message format of the BWMap generated by the OLT in the embodiment of the present application can not only shorten the transmission interval of the service flow of each ONU, but also greatly reduce the transmission delay of the ONU. After experiments, the average transmission delay of the ONU can be reduced. Within 20us, the problem that the transmission delay of the PON system applied to the mobile backhaul does not meet the requirements is solved, the data transmission rate and efficiency are improved, and the user satisfaction is improved.
  • an embodiment of the present invention further provides a data communication device, as shown in FIG. 10.
  • the data communication device includes a processor, a memory and a bus system, the processor and the memory being connected by the bus system, the memory for storing instructions, and the processor for executing the instructions stored by the memory .
  • the processor is configured to: receive a bandwidth request sent by each optical network unit ONU, where each ONU includes a first ONU1; and according to a bandwidth requested by the ONU and configured by the ONU Bandwidth, a bandwidth map BWMap message is generated, wherein the BWMap message includes: a first allocation identifier Alloc-ID1, a first time corresponding to the Alloc-ID1; a second allocation identifier Alloc-ID2, and the Alloc-ID2 Corresponding second time; the Alloc-ID1 and the Alloc-ID2 are all allocated to the ONU1; the BWMap message is sent to each ONU.
  • the processor may be configured to: send a bandwidth map BWMap request to the optical line terminal OLT, request the OLT to allocate bandwidth; and receive the bandwidth map returned by the optical line terminal OLT.
  • a BWMap message the BWMap message includes: a first allocation identifier Alloc-ID1, a first time corresponding to the Alloc-ID1; a second allocation identifier Alloc-ID2, a second time corresponding to the Alloc-ID2; Alloc-ID1 and Alloc-ID2 are assigned to the first ONU1.
  • the device after receiving the registration request message, the device temporarily allocates the bandwidth resource to the user equipment, and ensures that no uplink data arrives at the RRU and the ONU during the registration period, thereby preventing the data from being sent to the BBU in time due to the ONU registration, and the delay
  • the problem of the delay of the interface between the BBU and the RRU is solved.
  • the problem of the impact of the ONU registration on the delay-sensitive service is solved.
  • the application of the PON system to the mobile bearer system can still meet the requirements of service transmission and improve user satisfaction. degree.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

Abstract

本申请公开了一种带宽分配的方法、光线路终端、光网络单元以及系统，该方法包括：接收各光网络单元ONU发送的带宽请求，所述各ONU包括第一ONU1；根据所述ONU请求的带宽和所述ONU配置的带宽，生成带宽地图BWMap消息，其中，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述ONU1使用；发送所述BWMap消息给各ONU，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。

Description

数据通信系统、光线路终端及基带单元 技术领域
本申请涉及光通信领域，特别涉及一种数据通信系统、光线路终端(Optical Line Terminal，OLT)及基带单元(Baseband Unit，BBU)。
背景技术
无源光网络(Passive Optical Network，PON)是一种点对多点的网络拓扑结构，通常包括位于中心局的光线路终端(Optical Line Terminal，OLT)、位于用户端的多个光网络单元(Optical Network Unit，ONU)以及位于两者之间的光分配网络(Optical Distribution Network，ODN)。
PON系统中，动态带宽分配(Dynamically Bandwidth Assignment,DBA)，是一种能在微秒或毫秒级的时间间隔内完成对上行带宽的动态分配的机制。现有的PON系统中，OLT根据各ONU上报的请求带宽，广播下发(Bandwidth Map，BWMap)消息，使得各ONU通过所述BWMap消息在OLT分配的时间内传输数据，但是由于目前这种带宽分配机制，从ONU的上行端口发送数据到OLT的PON端口接收数据产生的平均延时300us微妙以上，甚至有1-4毫秒ms，对于应用5G的移动回传场景，由于用户的数据的实时传输需求，系统规定从ONU的上行端口到OLT的端口接收数据这期间产生的延时在20微妙内。显然，目前的DBA分配机制将导致移动承载的场景下的时延无法满足业务传输所的时延的性能要求。
发明内容
为了解决PON系统应用到移动回传时传输时延不满足要求的问题，进而通过降低PON系统的传输时延，提高数据传输速率和传输效率，所述技术方案如下：
第一种设计方案，提供了一种带宽分配的方法，该方法包括：
接收各光网络单元ONU发送的带宽请求，所述各ONU包括第一ONU1；
根据所述ONU请求的带宽和所述ONU配置的带宽，生成带宽地图BWMap消息，其中，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述ONU1使用；
发送所述BWMap消息给各ONU。
本设计方案中，这样设计后，ONU1的视频数据就可以一个周期内分配两次带宽授权用于传输该视频数据，一般一个传输周期为125微秒us，即在125us秒内，该视频数据可以被传输两次，若按照一个周期为125us，则每个T-CONT对应的传输时间为125/6，约为21us，即从第一次传输该视频数据到下一次传输该视频数据之间时间间隔为63us，相比现有的DBA的传输机制，若ONU1要在125us内仅传输一次该视频数据，下次传输该视频数据的时间间隔为125us，若该ONU1错过该次传输数据，该ONU需要等待125us再进行第二次传输。由此可知，通过本申请实施例这种BWMap的消息格式的改进，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。
基于上述的设计方案，一种可能的设计中，所述BWMap消息还包括：第三分配标识Alloc-ID3和与所述Alloc-ID3对应的第三时间；所述Alloc-ID3用于标识第二ONU2，所述第三时间用于分配给所述ONU2使用。
基于上述的设计方案，另一种可能的设计中，所述第一时间包括：第一起始时间start time 1，第一结束时间end time 1；所述第二时间包括：第二起始时间start time 2，第二结束时间end time 2；其中，所述start time 1用于指示所述ONU1传输第一数据流的起始字节，所述end time 1用于指示所述ONU1传输一数据流的结束字节；所述start time 2用于指示所述ONU1传输第二数据流的 起始字节，第二结束时间end time 2用于指示所述ONU1传输第二数据流的结束字节，其中，所述第一数据流和第二数据流承载相同类型的业务流；或者，所述第一数据流和所述第二数据流承载不同类型的业务流。
基于上述的设计方案，另一种可能的设计中，所述Alloc-ID1相对于所述Alloc-ID2在各个周期的BWMap消息中的位置固定。
第二种设计方案中，提供了一种带宽分配的方法，该方法包括：
发送带宽地图BWMap请求给光线路终端OLT，请求OLT分配带宽；
接收光线路终端OLT返回的带宽地图BWMap消息，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述第一ONU1。
本设计方案中，这样设计后，ONU1的视频数据就可以一个周期内分配两次带宽授权用于传输该视频数据，一般一个传输周期为125微秒us，即在125us秒内，该视频数据可以被传输两次，若按照一个周期为125us，则每个T-CONT对应的传输时间为125/6，约为21us，即从第一次传输该视频数据到下一次传输该视频数据之间时间间隔为63us，相比现有的DBA的传输机制，若ONU1要在125us内仅传输一次该视频数据，下次传输该视频数据的时间间隔为125us，若该ONU1错过该次传输数据，该ONU需要等待125us再进行第二次传输。由此可知，通过本申请实施例这种BWMap的消息格式的改进，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。
基于上述的涉及方案，一种可能的设计中，所述方法还包括：
根据自身的Alloc-ID，获取所述ONU1对应的第一时间和第二时间；
根据所述获取的第一时间传输第一数据，以及根据所述第二时间传输第二 数据。
基于上述的涉及方案，另一种可能的设计中，所述BWMap消息还包括：第三分配标识Alloc-ID3和与所述Alloc-ID3对应的第三时间；所述Alloc-ID3用于标识第二ONU2，所述第三时间用于分配给所述ONU2使用。
基于上述的涉及方案，一种可能的设计中，所述第一时间包括：第一起始时间start time 1，第一结束时间end time 1；所述第二时间包括：第二起始时间start time 2，第二结束时间end time 2；其中，所述start time 1用于指示所述ONU1传输第一数据流的起始字节，所述end time 1用于指示所述ONU1传输一数据流的结束字节；所述start time 2用于指示所述ONU1传输第二数据流的起始字节，第二结束时间end time 2用于指示所述ONU1传输第二数据流的结束字节，其中，所述第一数据流和第二数据流承载相同类型的业务流；或者，所述第一数据流和所述第二数据流承载不同类型的业务流。
基于上述的涉及方案，另一种可能的设计中，所述Alloc-ID1相对于所述Alloc-ID2在各个周期的BWMap消息中的位置固定。
第三种设计方案中提供了一种光线路终端OLT，所述OLT包括：
收发器，用于接收各光网络单元ONU发送的带宽请求，所述各ONU包括第一ONU1；以及发送带宽地图BWMap消息给各ONU。
处理器，用于根据所述ONU请求的带宽和所述ONU配置的带宽，生成所述BWMap消息，其中，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述ONU1使用。
本设计方案中，这样设计后，ONU1的视频数据就可以一个周期内分配两次带宽授权用于传输该视频数据，一般一个传输周期为125微秒us，即在125us秒内，该视频数据可以被传输两次，若按照一个周期为125us，则每个T-CONT对应的传输时间为125/6，约为21us，即从第一次传输该视频数据到下一次传输该视频数据之间时间间隔为63us，相比现有的DBA的传输机制，若ONU1 要在125us内仅传输一次该视频数据，下次传输该视频数据的时间间隔为125us，若该ONU1错过该次传输数据，该ONU需要等待125us再进行第二次传输。由此可知，通过本申请实施例这种BWMap的消息格式的改进，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。
基于第三种设计方案，在一种可能的设计中，所述BWMap消息还包括：第三分配标识Alloc-ID3和与所述Alloc-ID3对应的第三时间；所述Alloc-ID3用于标识第二ONU2，所述第三时间用于分配给所述ONU2使用。
基于第三种设计方案，在另一种可能的设计中，所述第一时间包括：第一起始时间start time 1，第一结束时间end time 1；所述第二时间包括：第二起始时间start time 2，第二结束时间end time 2；其中，所述start time 1用于指示所述ONU1传输第一数据流的起始字节，所述end time 1用于指示所述ONU1传输一数据流的结束字节；所述start time 2用于指示所述ONU1传输第二数据流的起始字节，第二结束时间end time 2用于指示所述ONU1传输第二数据流的结束字节，其中，所述第一数据流和第二数据流承载相同类型的业务流；或者，所述第一数据流和所述第二数据流承载不同类型的业务流。
基于第三种设计方案，在另一种可能的设计中，所述Alloc-ID1相对于所述Alloc-ID2在各个周期的BWMap消息中的位置固定。
本设计方案中，这样设计后，ONU1的视频数据就可以一个周期内分配两次带宽授权用于传输该视频数据，一般一个传输周期为125微秒us，即在125us秒内，该视频数据可以被传输两次，若按照一个周期为125us，则每个T-CONT对应的传输时间为125/6，约为21us，即从第一次传输该视频数据到下一次传输该视频数据之间时间间隔为63us，相比现有的DBA的传输机制，若ONU1要在125us内仅传输一次该视频数据，下次传输该视频数据的时间间隔为 125us，若该ONU1错过该次传输数据，该ONU需要等待125us再进行第二次传输。由此可知，通过本申请实施例这种BWMap的消息格式的改进，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。
第四种设计方案中，提供了一种一种光网络单元ONU，所述ONU包括：
发送器，用于发送带宽请求给光线路终端OLT；
接收器，用于接收光线路终端OLT返回的带宽地图BWMap消息，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述第一ONU1。
基于第四种设计方案中，提供了一种可能的实现方式，所述ONU还包括：
处理器，用于根据自身的Alloc-ID，获取所述ONU1对应的第一时间和第二时间，指示所述发送器在所述第一时间和第二时间传输数据；
所述发送器，还用于根据所述获取的第一时间传输第一数据，以及根据所述第二时间传输第二数据。
基于第四种设计方案中，提供了另一种可能的实现方式，所述BWMap消息还包括：第三分配标识Alloc-ID3和与所述Alloc-ID3对应的第三时间；所述Alloc-ID3用于标识第二ONU2，所述第三时间用于分配给所述ONU2使用。
基于第四种设计方案中，提供了第三种可能的实现方式，所述第一时间包括：第一起始时间start time 1，第一结束时间end time 1；所述第二时间包括：第二起始时间start time 2，第二结束时间end time 2；其中，所述start time 1用于指示所述ONU1传输第一数据流的起始字节，所述end time 1用于指示所述ONU1传输一数据流的结束字节；所述start time 2用于指示所述ONU1传输第二数据流的起始字节，第二结束时间end time 2用于指示所述ONU1传输第二数据流 的结束字节，其中，所述第一数据流和第二数据流承载相同类型的业务流；或者，所述第一数据流和所述第二数据流承载不同类型的业务流。
基于第四种设计方案中，提供了第四种可能的实现方式，所述Alloc-ID1相对于所述Alloc-ID2在各个周期的BWMap消息中的位置固定。
本设计方案中，这样设计后，ONU1的视频数据就可以一个周期内分配两次带宽授权用于传输该视频数据，一般一个传输周期为125微秒us，即在125us秒内，该视频数据可以被传输两次，若按照一个周期为125us，则每个T-CONT对应的传输时间为125/6，约为21us，即从第一次传输该视频数据到下一次传输该视频数据之间时间间隔为63us，相比现有的DBA的传输机制，若ONU1要在125us内仅传输一次该视频数据，下次传输该视频数据的时间间隔为125us，若该ONU1错过该次传输数据，该ONU需要等待125us再进行第二次传输。由此可知，通过本申请实施例这种BWMap的消息格式的改进，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。
第五种设计方案中，提供了一种无源光网络系统PON，包括光线路终端OLT和光网络单元ONU，所述OLT通过光分配网ODN与所述ONU连接，所述OLT包括如上述第三中设计方案中涉及的OLT，所述ONU包括上述第四种设计方案中所述的ONU。
本设计方案中，这样设计后，ONU1的视频数据就可以一个周期内分配两次带宽授权用于传输该视频数据，一般一个传输周期为125微秒us，即在125us秒内，该视频数据可以被传输两次，若按照一个周期为125us，则每个T-CONT对应的传输时间为125/6，约为21us，即从第一次传输该视频数据到下一次传输该视频数据之间时间间隔为63us，相比现有的DBA的传输机制，若ONU1要在125us内仅传输一次该视频数据，下次传输该视频数据的时间间隔为 125us，若该ONU1错过该次传输数据，该ONU需要等待125us再进行第二次传输。由此可知，通过本申请实施例这种BWMap的消息格式的改进，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。
附图说明
图1示出了本申请一个实施例提供的数据通信系统的系统架构图；
图2示出了本申请实施例提供的一种带宽分配的方法流程示意图；
图3示出了本申请实施例提供的一种BWMap消息格式；
图4示出了本申请实施例提供的BWMap消息对应的分配周期图；
图5示出了本申请实施例提供的一种BWMap消息格式；
图6示出了本申请实施例提供的BWMap消息对应的分配周期图；
图7示出了本申请实施例提供的另一种BWMap消息格式；
图8示出了本申请实施例提供的一种光线路终端OLT的结构示意图；
图9示出了本申请实施例提供的一种光网络单元ONU的结构示意图；
图10示出了申请实施例提供的另一种网络设备的结构示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
在本文中提及的“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。
请参考图1，所述无源光网络系统100包括至少一个光线路终端(OLT)110、多个光网络单元(ONU)120和一个光分配网络(ODN)130。所述光线路终端110通过所述光分配网络130以点到多点的形式连接到所述多个光网络单元120。 所述光线路终端110和所述光网络单元120之间可以采用TDM机制、WDM机制或者TDM/WDM混合机制进行通信。其中，从所述光线路终端110到所述光网络单元120的方向定义为下行方向，而从所述光网络单元120到所述光线路终端110的方向为上行方向。
所述无源光网络系统100可以是不需要任何有源器件来实现所述光线路终端110与所述光网络单元120之间的数据分发的通信网络，在具体实施例中，所述光线路终端110与所述光网络单元120之间的数据分发可以通过所述光分配网络130中的无源光器件(比如分光器)来实现。所述无源光网络系统100可以为ITU-T G.983标准定义的异步传输模式无源光网络(ATM PON)系统或宽带无源光网络(BPON)系统、ITU-T G.984系列标准定义的吉比特无源光网络(GPON)系统、IEEE 802.3ah标准定义的以太网无源光网络(EPON)、波分复用无源光网络(WDM PON)系统或者下一代无源光网络(NGA PON系统，比如ITU-T G.987系列标准定义的XGPON系统、IEEE 802.3av标准定义的10G EPON系统、TDM/WDM混合PON系统等)。上述标准定义的各种无源光网络系统的全部内容通过引用结合在本申请文件中。
所述光线路终端110通常位于中心位置(例如中心局Central Office，CO)，其可以统一管理所述多个光网络单元120。所述光线路终端110可以充当所述光网络单元120与上层网络(图未示)之间的媒介，将从所述上层网络接收到的数据作为下行数据转发到所述光网络单元120，以及将从所述光网络单元120接收到的上行数据转发到所述上层网络。所述光线路终端110的具体结构配置可能会因所述无源光网络100的具体类型而异，在一种实施例中，所述光线路终端110可以包括光收发组件200和数据处理模块(图未示)，所述光收发组件200可以将经过所述数据处理模块处理的下行数据转换成下行光信号，并通过所述光分配网络130将下行光信号发送给所述光网络单元120，并且接收所述光网络单元120通过所述光分配网络130发送的上行光信号，并将所述上行数据信号转换为电信号并提供给所述数据处理模块进行处理。
所述光网络单元120可以分布式地设置在用户侧位置(比如用户驻地)。所述光网络单元120可以为用于与所述光线路终端110和用户进行通信的网络设备，具体而言，所述光网络单元120可以充当所述光线路终端110与所述用户之间的媒介，例如，所述光网络单元120可以将从所述光线路终端110接收到的下行数据转发到用户，以及将从用户接收到的数据作为上行数据转发到所述光线路终端110。所述光网络单元120的具体结构配置可能会因所述无源光网络100的具体类型而异，在一种实施例中，所述光网络单元120可以包括光收发组件300，所述光收发组件300用于接收所述光线路终端110通过所述光分配网络130发送的下行数据信号，并且通过所述光分配网络130向所述光线路终端110发送上行数据信号。应当理解，在本申请文件中，所述光网络单元120的结构与光网络终端(Optical Network Terminal,ONT)相近，因此在本申请文件提供的方案中，光网络单元和光网络终端之间可以互换。
所述光分配网络130可以是一个数据分发系统，其可以包括光纤、光耦合器、光合波/分波器、光分路器和/或其他设备。在一个实施例中，所述光纤、光耦合器、光合波/分波器、光分路器和/或其他设备可以是无源光器件，具体来说，所述光纤、光耦合器、光合波/分波器、光分路器和/或其他设备可以是在所述光线路终端110和所述光网络单元120之间分发数据信号是不需要电源支持的器件。另外，在其他实施例中，该光分配网络130还可以包括一个或多个处理设备，例如，光放大器或者中继设备(Relay device)。在如图1所示的分支结构中，所述光分配网络130具体可以从所述光线路终端110延伸到所述多个光网络单元120，但也可以配置成其他任何点到多点的结构。
所述光收发组件200或300可以是集成有光信号收发与光电转换功能以及OTDR测试功能的可插拔光收发组件，以所述光线路终端110的光收发组件200为例，所述光收发组件可以包括光发射模块210、光接收模块220和OTDR测试模块230。其中，所述光发射模块210用于将下行数据信号通过所述光分配网络130下发给所述光网络单元120，并在需要对光纤网络和PON设备进行检 测时，根据OTDR检测模块230提供的OTDR测试控制信号，将OTDR测试信号调制到所述下行数据信号并输出到所述光分配网络130。所述光接收模块220用于接收来自所述光网络单元120且通过所述光分配网络130传送的上行数据信号，并通过光电转换将其转换为电信号并转发给所述光线路终端110的控制模块或者数据处理模块(图未示)进行处理。
需要说明的是，图1所示的PON系统可以为EPON系统、GPON系统；也可以是10G EPON、100G EPON；还可以是XG-PON，XGS-PON，TWDM-PON，本申请实施例并不对此进行限定。
下面所描述的各种带宽分配的方法均适用于上述图1的系统。
请参考图2，图2为一种带宽分配的方法，应用于上述图1的系统架构中。
所述方法包括：
S200、各ONU发送带宽地图请求给OLT，请求OLT分配带宽，所述各ONU包括第一ONU1。
S202、OLT接收各ONU发送的带宽请求。
S204、OLT根据所述ONU请求的带宽和所述ONU配置的带宽，生成带宽地图BWMap消息，其中，所述BWMap消息包括：第一分配标识Allocation Identifier，Alloc-ID)1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述ONU1使用。
进一步地，所述第一时间包括：第一起始时间start time 1，第一结束时间end time 1；所述第二时间包括：第二起始时间start time 2，第二结束时间end time 2；其中，所述start time 1用于指示所述ONU1传输第一数据流的起始字节，所述end time 1用于指示所述ONU1传输一数据流的结束字节；所述start time 2用于指示所述ONU1传输第二数据流的起始字节，第二结束时间end time2用于指示所述ONU1传输第二数据流的结束字节，其中，所述第一数据流和第二数据流承载相同类型的业务流；或者，所述第一数据流和所述第二数据流承载不同类型的业务流。
进一步地，所述BWMap消息还包括：第三分配标识Alloc-ID3和与所述 Alloc-ID3对应的第三时间；所述Alloc-ID3用于标识第二ONU2，所述第三时间用于分配给所述ONU2使用。
进一步地，所述BWMap消息还包括：第三分配标识Alloc-ID3和与所述Alloc-ID3对应的第三时间；所述Alloc-ID3用于标识第二ONU2，所述第三时间用于分配给所述ONU2使用。
具体的OLT生成的BWMap消息的格式如图3所示：
所述BWMap消息包括：分配标识Alloc-ID字段、开始时间Start time(图中简写为Start)字段、结束时间End time(图中简写为End)字段，其中Alloc-ID字段用于标识分配给各ONU的传输容器(Transmission Container，T-CONT)，所述T-CONT用于传输数据的容器，具体表示可以传输多少字节的数据流；所述Start time字段用于表示T-CONT承载数据的起始字节对应的时间；所述End time字段用于表示T-CONT承载数据的结束字节对应的时间，由于各ONU传输速率固定的，每个ONU对应的传输容量也是预先配置的，根据该传输速率和待传送的数据字节数便可以获知该ONU的起始字节对应的时间和ONU结束发送待传送的字节对应的时间，这里与ITU-T G.984.3以及G.987.3BWMap的字段的描述一致，这里就不再赘述。
如图3，OLT生成BWMap消息包括：Alloc-ID 1用于标识分配给ONU1的T-CONT1，Start time 100和End time 300表示ONU1从第100字节开始发送数据，在第300字节结束发送数据，该T-CONT1用于承载200字节的数据容量，该T-CONT1用于承载ONU1的数据；Alloc-ID 2用于标识分配给ONU2的T-CONT2，Start time 400和End time 500表示ONU2从第400字节开始发送数据，在第500字节结束发送数据，该T-CONT2用于承载100字节的数据容量，该T-CONT2用于承载ONU2的数据；Alloc-ID 3用于标识分配给ONU3的T-CONT3，Start time 520和End time 600表示ONU3从第520字节开始发送数据，在第600字节结束发送数据，该T-CONT2用于承载80字节的数据容量，该T-CONT3用于承载ONU3的数据；该BWMap与现有BWMap的实现有所不同，该周期内该BWMap还包括：Alloc-ID 1用于标识分配给ONU1的T-CONT1，Start time 700和End time 900表示ONU1从第700字节开始发送数据，在第900字节结束发送数据，该T-CONT1用于承载200字节的数据容量，该T-CONT1用于承载ONU1的数据；在一个周期的一个BWMap内，ONU1 的数据可以在指定的时间内分配两次带宽授权，该ONU1传输的数据可以是同一业务类型的数据，也可以是不同业务类型的数据，例如，ONU1的视频数据可以通过T-CONT1和T-CONT2分别承载，在第100字节开始传输该视频数据，在第300字节停止传输该视频数据；在第700字节又开始传输该视频数据，在第900字节开始结束传输该视频数据。
这样设计后，ONU1的视频数据就可以一个周期内分配两次带宽授权用于传输该视频数据，一般一个传输周期为125微秒us，即在125us秒内，该视频数据可以被传输两次，若按照一个周期为125us，则每个T-CONT对应的传输时间为125/6，约为21us，即从第一次传输该视频数据到下一次传输该视频数据之间时间间隔为63us，相比现有的DBA的传输机制，若ONU1要在125us内仅传输一次该视频数据，下次传输该视频数据的时间间隔为125us，若该ONU1错过该次传输数据，该ONU需要等待125us再进行第二次传输。由此可知，通过本申请实施例这种BWMap的消息格式的改进，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。
进一步地，所述BWMap消息还可以包括：Alloc-ID 4用于标识分配给ONU2的T-CONT4，Start time 1000和End time 1050表示ONU2从第1000字节开始发送数据，在第1050字节结束发送数据，该T-CONT4用于承载50字节的数据容量，该T-CONT4用于承载ONU2的数据；如此设计，ONU2在一个周期的一个BWMap内，ONU2的数据可以在指定的时间内分别传输不同类型的数据，也可以传输相同业务类型的数据例如，ONU2的视频数据可以通过T-CONT1承载，在第1000字节开始传输该视频数据，在第1050字节停止传输该视频数据；ONU2还可以在第1000字节开始传输上网数据，在第1050字节开始结束传输该上网数据。如此设计，对于ONU2而言，不同业务类型的数据而言，也极大地缩短了ONU2中待传输的各种业务类型的数据的传输时间，极大地降低了ONU2的数据传输时延，保证了这种设计下的各ONU的传输时延满足20us内的要求，提高了各种业务类型数据传输速率和传输效率，提高了用户的满意程度。
对应于上述实施例的描述，该BWMap消息对应的分配周期如图4所示， 该分配周期以现有每个周期125us举例说明的，但是不局限于该周期。当分配周期为125us一次时，每个T-CONT对应的时间125/6，约为21us，即T-CONT1传输一次数据约21us，该ONU1在T-CONT1传输数据到下一次通过T-CONT1传输数据的时间间隔为21*3，约为63us。该125us内对T-CONT1而言可以用于承载ONU1的待发送的数据有两次，即相比现有技术，在一个周期内，对该ONU而言的每次传输数据的传输时间间隔从125us降低到63us，因此通过该设计，计算的ONU1的平均时延也可以降低到20us内。
如图5所示，OLT所生成的BWMap消息具体还可以为图5所示的消息格式，与图4的区别在于，图5所示的BWMap消息格式除了包括给ONU1的T-CONT1分配了两次带宽授权，还可以包括OLT给ONU2以及ONU3或者ONU4分配的一次带宽授权。这种BWMap消息格式既可以兼容上述图5中针对ONU1分配的两次带宽授权，又可以兼容现有的BWMap消息中为其它ONU分配一次带宽授权的格式。具体如下：
Alloc-ID 1用于标识分配给ONU1的T-CONT1，Start time 100和End time300表示ONU1从第100字节开始发送数据，在第300字节结束发送数据，该T-CONT1用于承载200字节的数据容量，该T-CONT1用于承载ONU1的数据；Alloc-ID 2用于标识分配给ONU2的T-CONT2，Start time 400和End time 500表示ONU2从第400字节开始发送数据，在第500字节结束发送数据，该T-CONT2用于承载100字节的数据容量，该T-CONT2用于承载ONU2的数据；Alloc-ID 3用于标识分配给ONU3的T-CONT3，Start time 520和End time 600表示ONU3从第520字节开始发送数据，在第600字节结束发送数据，该T-CONT2用于承载80字节的数据容量，该T-CONT3用于承载ONU3的数据；该周期内该BWMap还包括：Alloc-ID 1用于标识分配给ONU1的T-CONT1，Start time 700和End time 900表示ONU1从第700字节开始发送数据，在第900字节结束发送数据，该T-CONT1用于承载200字节的数据容量，该T-CONT1用于承载ONU1的数据；在一个周期的一个BWMap内，ONU1的数据可以在指定的时间内分配两次带宽授权，该ONU1传输的数据可以是同一业务类型的数据，也可以是不同业务类型的数据，例如，ONU1的视频数据可以通过T-CONT1和T-CONT2分别承载，在第100字节开始传输该视频数据，在第300字节停止传输该视频数据；在第700字节又开始传输该视频数据，在第900字节开始结束传输该视频数据。
这样设计后，ONU1的视频数据就可以一个周期内分配两次带宽授权用于传输该视频数据，一般一个传输周期为125微秒us，即在125us秒内，该视频数据可以被传输两次，若按照一个周期为125us，则每个T-CONT对应的传输时间为125/6，约为21us，即从第一次传输该视频数据到下一次传输该视频数据之间时间间隔为63us，相比现有的DBA的传输机制，若ONU1要在125us内仅传输一次该视频数据，下次传输该视频数据的时间间隔为125us，若该ONU1错过该次传输数据，该ONU需要等待125us再进行第二次传输。由此可知，通过本申请实施例这种BWMap的消息格式的改进，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。
进一步地，所述BWMap消息还可以包括：Alloc-ID 4用于标识分配给ONU4的T-CONT4，Start time 1000和End time 1050表示ONU4从第1000字节开始发送数据，在第1050字节结束发送数据，该T-CONT4用于承载50字节的数据容量，该T-CONT4用于承载ONU4的数据；如此设计，表示该BWMap消息即可以给ONU1在一个周期内分配两次带宽授权，也可以给在给各ONU分配完固定的带宽授权外，还可以兼容现有的带宽分配机制，将剩余带宽用于给其它只分配一次带宽授权的ONU使用，例如：Alloc-ID 5,Alloc-ID 6，以及Alloc-ID7所示的带宽授权的起始字节以及结束字节。如此设计，对于ONU1而言的带宽分配周期为125us/N，而对ONU4而言带宽分配周期为125us，允许该系统支持这种情况，进而极大地缩短了各ONU中待传输的各种业务类型的数据的传输时间，极大地降低了系统的数据传输时延，保证了这种设计下的各ONU的传输时延满足20us内的要求，提高了各种业务类型数据传输速率和传输效率，提高了用户的满意程度。
对应于上述实施例的描述，该BWMap消息对应的分配周期如图6所示，该T-CONT1为承载ONU1的数据，同时增加对应现有DBA分配机制中带宽授权的描述，例如Allco-ID2，Allco-ID3以及Allco-ID4和Allco-ID5等。该分配周期以现有每个周期125us举例说明的，但是不局限于该周期。当分配周期为125us一次时，每个T-CONT对应的时间125/6，约为21us，即T-CONT1传输一次数据约21us，该ONU1在T-CONT1传输数据到下一次通过T-CONT1 传输数据的时间间隔为21*3，约为63us。该125us内对T-CONT1而言可以用于承载ONU1分配两次带宽授权，即相比现有技术ONU1的带宽授权时隙更小了，在一个周期内，对该ONU而言的每次传输数据的传输时间间隔从125us降低到63us，因此通过该设计，计算的ONU1的平均时延也可以降低到20us内。
如图7所示为另一种BWMap消息格式，该消息格式与上述两种的BWMap帧的消息格式基本相同，消息格式中的各个字段的相对位置也不边。
图7中为OLT下发给ONU的一种下行帧downstream frame n的格式，包括：帧头frame header和帧的净荷frame payload，其中上行带宽地图US BWMap消息格式位于所述下行第n帧的帧头部分，具体如下：
Alloc-ID 1用于标识分配给ONU1的T-CONT1，Start time 100和End time300表示ONU1从第100字节开始发送数据，在第300字节结束发送数据，该T-CONT1用于承载200字节的数据容量，该T-CONT1用于承载ONU1的数据；Alloc-ID 2用于标识分配给ONU2的T-CONT2，Start time 400和End time 500表示ONU2从第400字节开始发送数据，在第500字节结束发送数据，该T-CONT2用于承载100字节的数据容量，该T-CONT2用于承载ONU2的数据；Alloc-ID 3用于标识分配给ONU3的T-CONT3，Start time 520和End time 600表示ONU3从第520字节开始发送数据，在第600字节结束发送数据，该T-CONT2用于承载80字节的数据容量，该T-CONT3用于承载ONU3的数据；该BWMap与现有BWMap的实现有所不同，该周期内该BWMap还包括：Alloc-ID 1用于标识分配给ONU1的T-CONT1，Start time 700和End time 900表示ONU1从第700字节开始发送数据，在第900字节结束发送数据，该T-CONT1用于承载200字节的数据容量，该T-CONT1用于承载ONU1的数据；在一个周期的一个BWMap内，ONU1的数据可以在指定的时间内分配两次带宽授权，该ONU1传输的数据可以是同一业务类型的数据，也可以是不同业务类型的数据，例如，ONU1的视频数据可以通过T-CONT1和T-CONT2分别承载，在第100字节开始传输该视频数据，在第300字节停止传输该视频数据；在第700字节又开始传输该视频数据，在第900字节开始结束传输该视频数据。
这样设计后，ONU1的视频数据就可以一个周期内分配两次带宽授权用于传输该视频数据，一般一个传输周期为125微秒us，即在125us秒内，该视频数据可以被传输两次，若按照一个周期为125us，则每个T-CONT对应的传输 时间为125/6，约为21us，即从第一次传输该视频数据到下一次传输该视频数据之间时间间隔为63us，相比现有的DBA的传输机制，若ONU1要在125us内仅传输一次该视频数据，下次传输该视频数据的时间间隔为125us，若该ONU1错过该次传输数据，该ONU需要等待125us再进行第二次传输。由此可知，通过本申请实施例这种BWMap的消息格式的改进，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。
进一步地，所述BWMap消息还可以包括：Alloc-ID 4用于标识分配给ONU2的T-CONT4，Start time 1000和End time 1050表示ONU2从第1000字节开始发送数据，在第1050字节结束发送数据，该T-CONT4用于承载50字节的数据容量，该T-CONT4用于承载ONU2的数据；如此设计，ONU2在一个周期的一个BWMap内，ONU2的数据可以在指定的时间内分别传输不同类型的数据，也可以传输相同业务类型的数据例如，ONU2的视频数据可以通过T-CONT1承载，在第1000字节开始传输该视频数据，在第1050字节停止传输该视频数据；ONU2还可以在第1000字节开始传输上网数据，在第1050字节开始结束传输该上网数据。如此设计，对于ONU2而言，不同业务类型的数据而言，也极大地缩短了ONU2中待传输的各种业务类型的数据的传输时间，极大地降低了ONU2的数据传输时延，保证了这种设计下的各ONU的传输时延满足20us内的要求，提高了各种业务类型数据传输速率和传输效率，提高了用户的满意程度。
通过上述的描述结合附图，显然，前后两次的带宽授权中，Alloc-ID1是指给ONU1分配的T-CONT，在下一个周期里，Alloc-ID1的位置也是相对固定，进而通过改进后的BWMapde的消息格式的DBA分配机制，可以降低了ONU到OLT之间传输时延，提高了传输效率和传输速率。
S206、OLT发送所述BWMap消息给各ONU。
具体地，所述OLT广播所述BWMap消息给各ONU。
S208、所述ONU1接收光线路终端OLT返回的带宽地图BWMap消息。
进一步地，所述方法还可以包括：
S210、所述ONU1根据自身的Alloc-ID，获取所述ONU1对应的第一时间 和第二时间。
S212、根据所述获取的第一时间传输第一数据，以及根据所述第二时间传输第二数据。
具体地，所述OLT预先通过管理配置消息为各ONU分配Al loc-ID，所述各ONU接收并存储各自的Al loc-ID。当ONU1接收OLT通过广播发送的BWMap消息的时候，各ONU根据自身的Al loc-ID，获取各自ONU自己的T-CONT，进而获得该T-CONT的带宽授权，即获取该T-CONT对应的第一时间。若该ONU根据查找Al loc-ID获知该ONU在一个周期内的一个BWMap消息中有至少两次带宽授权，则分别根据消息中的带宽授权时间，传送数据，即，根据所述获取的第一时间传输第一数据，以及根据所述第二时间传输第二数据；其中，第一时间对应该T-CONT承载数据的起始发送字节和结束发送字节；第二时间对应该T-CONT承载数据的起始发送字节和结束发送字节。第一时间和第二时间为按照增序的方式进行分配。
这样设计后，ONU1的视频数据就可以一个周期内分配两次带宽授权用于传输该视频数据，一般一个传输周期为125微秒us，即在125us秒内，该视频数据可以被传输两次，若按照一个周期为125us，则每个T-CONT对应的传输时间为125/6，约为21us，即从第一次传输该视频数据到下一次传输该视频数据之间时间间隔为63us，相比现有的DBA的传输机制，若ONU1要在125us内仅传输一次该视频数据，下次传输该视频数据的时间间隔为125us，若该ONU1错过该次传输数据，该ONU需要等待125us再进行第二次传输。由此可知，通过本申请实施例这种BWMap的消息格式的改进，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。
本发明实施例还提供了一种光线路终端OLT，如图8所示所述OLT包括：
收发器800，用于接收各光网络单元ONU发送的带宽请求，所述各ONU包括第一ONU1；以及发送带宽地图BWMap消息给各ONU。
处理器802，用于根据所述ONU请求的带宽和所述ONU配置的带宽，生成所述BWMap消息，其中，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述ONU1使用。
进一步地，所述BWMap消息还包括：第三分配标识Alloc-ID3和与所述Alloc-ID3对应的第三时间；所述Alloc-ID3用于标识第二ONU2，所述第三时间用于分配给所述ONU2使用。
进一步地，所述第一时间包括：第一起始时间start time 1，第一结束时间end time 1；所述第二时间包括：第二起始时间start time 2，第二结束时间end time 2；其中，所述start time 1用于指示所述ONU1传输第一数据流的起始字节，所述end time 1用于指示所述ONU1传输一数据流的结束字节；所述start time 2用于指示所述ONU1传输第二数据流的起始字节，第二结束时间end time2用于指示所述ONU1传输第二数据流的结束字节，其中，所述第一数据流和第二数据流承载相同类型的业务流；或者，所述第一数据流和所述第二数据流承载不同类型的业务流。
进一步地，所述Alloc-ID1相对于所述Alloc-ID2在各个周期的BWMap消息中的位置固定。
上述OLT生成的BWMap消息请参见图2-图7中以及相应的描述，这里就不再具体赘述。
上述的OLT在PON系统架构中的位置请参见图1中的OLT所示，其中，上述的收发器800可以为系统架构中的OLT110的光收发组件200，或者改收发器800位于该系统架构中OLT的光收发组件200中。
通过本申请实施例OLT生成的这种BWMap的消息格式的改进，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效 率，提高了用户的满意度。
结合图8以及图1的系统架构图，图1中的光线路终端还包括如图8所示的处理器800，图中未示出，该图中的处理器800可以为媒体接入控制器(Media Access Controller，MAC)或者其它微处理器。
本发明实施例还提供一种光网络单元ONU，如图9所示，所述ONU包括：
发送器900，用于发送带宽请求给光线路终端OLT；
接收器902，用于接收光线路终端OLT返回的带宽地图BWMap消息，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述第一ONU1。
进一步地，所述ONU还包括：
处理器904，用于根据自身的Alloc-ID，获取所述ONU1对应的第一时间和第二时间，指示所述发送器在所述第一时间和第二时间传输数据；
所述发送器900，还用于根据所述获取的第一时间传输第一数据，以及根据所述第二时间传输第二数据。
进一步地，所述BWMap消息还包括：第三分配标识Alloc-ID3和与所述Alloc-ID3对应的第三时间；所述Alloc-ID3用于标识第二ONU2，所述第三时间用于分配给所述ONU2使用。
进一步地，所述第一时间包括：第一起始时间start time 1，第一结束时间end time 1；所述第二时间包括：第二起始时间start time 2，第二结束时间end time 2；其中，所述start time 1用于指示所述ONU1传输第一数据流的起始字节，所述end time 1用于指示所述ONU1传输一数据流的结束字节；所述start time 2用于指示所述ONU1传输第二数据流的起始字节，第二结束时间end time2用于指示所述ONU1传输第二数据流的结束字节，其中，所述第一数据流和第二数据流承载相同类型的业务流；或者，所述第一数据流和所述第二数据流承载不同类型的业务流。
进一步地，所述Alloc-ID1相对于所述Alloc-ID2在各个周期的BWMap消息中的位置固定。
上述ONU接收到的BWMap的消息结构请参见图2-图7中以及相应的描述，这里就不再具体赘述。
通过本申请实施例ONU接收到该改进的BWMap的消息格式，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。
结合图1的系统架构图，图1中的光收发组件300可以包括图9中的发送器900和接收器902。另外，该发送器900和接收器902均可以组装成一个器件，例如光模块，也可以分开设置。
图1中的光网络单元120中未示意出处理器904，但是该光网络单元也包括该处理器904，，该图中的处理器904可以为媒体接入控制器(Media Access Controller，MAC)或者其它微处理器。
如图1所示的一种无源光网络系统PON，包括光线路终端OLT和光网络单元ONU，所述OLT通过光分配网ODN与所述ONU连接，所述OLT110的结构请参见上述OLT的具体结构的描述，所述ONU的具体结构请参见上述ONU的具体结构的描述，所示OLT与ONU执行的功能请分别参见上述的各个实施例的描述，这里就不再赘述。
通过本申请实施例OLT生成的的BWMap的消息格式，不仅可以缩短各ONU的业务流的传输间隔，而且极大地降低了ONU的传输延时，经过实验可知，该ONU的平均传输延时可以降低到20us之内，解决了PON系统应用到移动回传时传输时延不满足要求的问题，提高了数据传输速率和效率，提高了用户的满意度。
如图10所示，本发明实施例还提供了一种数据通信设备，如图10所示， 所述数据通信设备包括：处理器、存储器和总线系统，所述处理器和所述存储器通过所述总线系统相连，所述存储器用于存储指令，所述处理器用于执行所述存储器存储的指令。
当所述数据通信设备是OLT的时候，所述处理器用于：接收各光网络单元ONU发送的带宽请求，所述各ONU包括第一ONU1；根据所述ONU请求的带宽和所述ONU配置的带宽，生成带宽地图BWMap消息，其中，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述ONU1使用；发送所述BWMap消息给各ONU。
在另一种实施例中，当所述数据通信设备是ONU，所述处理器可以用于：发送带宽地图BWMap请求给光线路终端OLT，请求OLT分配带宽；接收光线路终端OLT返回的带宽地图BWMap消息，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述第一ONU1。
上述本申请实施例序号仅仅为了描述，不代表实施例的优劣。
本实施例中，当设备接收到注册请求消息后，暂停分配带宽资源给用户设备，保证在注册期间无上行数据到达RRU和ONU，进而避免因为ONU注册而导致数据无法及时发送给BBU，时延超过BBU和RRU之间接口对时延的要求，解决了ONU注册对时延敏感业务产生的影响的问题,使得将PON系统应用到移动承载系统中，仍然能满足业务传输的要求，提高用户满意度。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本申请的具体实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (19)

  1. 一种带宽分配的方法，其特征在于，该方法包括：
    接收各光网络单元ONU发送的带宽请求，所述各ONU包括第一ONU1；
    根据所述ONU请求的带宽和所述ONU配置的带宽，生成带宽地图BWMap消息，其中，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述ONU1使用；
    发送所述BWMap消息给各ONU。
  2. 根据权利要求1所述的注册方法，其特征在于，所述BWMap消息还包括：第三分配标识Alloc-ID3和与所述Alloc-ID3对应的第三时间；所述Alloc-ID3用于标识第二ONU2，所述第三时间用于分配给所述ONU2使用。
  3. 根据权利要求1所述的注册方法，其特征在于，所述第一时间包括：第一起始时间start time 1，第一结束时间end time 1；所述第二时间包括：第二起始时间start time 2，第二结束时间end time 2；其中，所述start time 1用于指示所述ONU1传输第一数据流的起始字节，所述end time 1用于指示所述ONU1传输一数据流的结束字节；所述start time 2用于指示所述ONU1传输第二数据流的起始字节，第二结束时间end time 2用于指示所述ONU1传输第二数据流的结束字节，其中，所述第一数据流和第二数据流承载相同类型的业务流；或者，所述第一数据流和所述第二数据流承载不同类型的业务流。
  4. 根据权利要求1所述的注册方法，其特征在于，所述Alloc-ID1相对于所述Alloc-ID2在各个周期的BWMap消息中的位置固定。
  5. 一种带宽分配的方法，其特征在于，该方法包括：
    发送带宽地图BWMap请求给光线路终端OLT，请求OLT分配带宽；
    接收光线路终端OLT返回的带宽地图BWMap消息，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识 Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述第一ONU1。
  6. 根据权利要求5所述的方法，其特征在于，所述方法还包括：
    根据自身的Alloc-ID，获取所述ONU1对应的第一时间和第二时间；
    根据所述获取的第一时间传输第一数据，以及根据所述第二时间传输第二数据。
  7. 根据权利要求5所述的注册方法，其特征在于，所述BWMap消息还包括：第三分配标识Alloc-ID3和与所述Alloc-ID3对应的第三时间；所述Alloc-ID3用于标识第二ONU2，所述第三时间用于分配给所述ONU2使用。
  8. 根据权利要求5所述的注册方法，其特征在于，所述第一时间包括：第一起始时间start time 1，第一结束时间end time 1；所述第二时间包括：第二起始时间start time 2，第二结束时间end time 2；其中，所述start time 1用于指示所述ONU1传输第一数据流的起始字节，所述end time 1用于指示所述ONU1传输一数据流的结束字节；所述start time 2用于指示所述ONU1传输第二数据流的起始字节，第二结束时间end time 2用于指示所述ONU1传输第二数据流的结束字节，其中，所述第一数据流和第二数据流承载相同类型的业务流；或者，所述第一数据流和所述第二数据流承载不同类型的业务流。
  9. 根据权利要求1所述的注册方法，其特征在于，所述Alloc-ID1相对于所述Alloc-ID2在各个周期的BWMap消息中的位置固定。
  10. 一种光线路终端OLT，其特征在于，所述OLT包括：
    收发器，用于接收各光网络单元ONU发送的带宽请求，所述各ONU包括第一ONU1；以及发送带宽地图BWMap消息给各ONU。
    处理器，用于根据所述ONU请求的带宽和所述ONU配置的带宽，生成所述BWMap消息，其中，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述ONU1使用。
  11. 根据权利要求10所述的OLT，其特征在于，所述BWMap消息还包括：第三分配标识Alloc-ID3和与所述Alloc-ID3对应的第三时间；所述Alloc-ID3用于标识第二ONU2，所述第三时间用于分配给所述ONU2使用。
  12. 根据权利要求10所述的OLT，其特征在于，所述第一时间包括：第一起始时间start time 1，第一结束时间end time 1；所述第二时间包括：第二起始时间start time 2，第二结束时间end time 2；其中，所述start time 1用于指示所述ONU1传输第一数据流的起始字节，所述end time 1用于指示所述ONU1传输一数据流的结束字节；所述start time 2用于指示所述ONU1传输第二数据流的起始字节，第二结束时间end time 2用于指示所述ONU1传输第二数据流的结束字节，其中，所述第一数据流和第二数据流承载相同类型的业务流；或者，所述第一数据流和所述第二数据流承载不同类型的业务流。
  13. 根据权利要求10所述的注册方法，其特征在于，所述Alloc-ID1相对于所述Alloc-ID2在各个周期的BWMap消息中的位置固定。
  14. 一种光网络单元ONU，其特征在于，所述ONU包括：
    发送器，用于发送带宽请求给光线路终端OLT；
    接收器，用于接收光线路终端OLT返回的带宽地图BWMap消息，所述BWMap消息包括：第一分配标识Alloc-ID1，与所述Alloc-ID1对应的第一时间；第二分配标识Alloc-ID2，与所述Alloc-ID2对应的第二时间；所述Alloc-ID1和Alloc-ID2均分配给所述第一ONU1。
  15. 根据权利要求14所述的ONU，其特征在于，所述ONU还包括：
    处理器，用于根据自身的Alloc-ID，获取所述ONU1对应的第一时间和第二时间，指示所述发送器在所述第一时间和第二时间传输数据；
    所述发送器，还用于根据所述获取的第一时间传输第一数据，以及根据所述第二时间传输第二数据。
  16. 根据权利要求14所述的ONU，其特征在于，所述BWMap消息还包括：第三分配标识Alloc-ID3和与所述Alloc-ID3对应的第三时间；所述Alloc-ID3 用于标识第二ONU2，所述第三时间用于分配给所述ONU2使用。
  17. 根据权利要求14所述的ONU，其特征在于，所述第一时间包括：第一起始时间start time 1，第一结束时间end time 1；所述第二时间包括：第二起始时间start time 2，第二结束时间end time 2；其中，所述start time 1用于指示所述ONU1传输第一数据流的起始字节，所述end time 1用于指示所述ONU1传输一数据流的结束字节；所述start time 2用于指示所述ONU1传输第二数据流的起始字节，第二结束时间end time 2用于指示所述ONU1传输第二数据流的结束字节，其中，所述第一数据流和第二数据流承载相同类型的业务流；或者，所述第一数据流和所述第二数据流承载不同类型的业务流。
  18. 根据权利要求14所述的ONU，其特征在于，所述Alloc-ID1相对于所述Alloc-ID2在各个周期的BWMap消息中的位置固定。
  19. 一种无源光网络系统PON，包括光线路终端OLT和光网络单元ONU，所述OLT通过光分配网ODN与所述ONU连接，其特征在于，所述OLT包括如权利要求10-13所述的OLT，所述ONU包括如权利要求权14-18所述的ONU。
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