WO2013075507A1 - 数据发送方法及系统 - Google Patents

数据发送方法及系统 Download PDF

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Publication number
WO2013075507A1
WO2013075507A1 PCT/CN2012/078255 CN2012078255W WO2013075507A1 WO 2013075507 A1 WO2013075507 A1 WO 2013075507A1 CN 2012078255 W CN2012078255 W CN 2012078255W WO 2013075507 A1 WO2013075507 A1 WO 2013075507A1
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WIPO (PCT)
Prior art keywords
olt
onu
standby
allocated
uplink
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PCT/CN2012/078255
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English (en)
French (fr)
Inventor
耿丹
张伟良
霍季姆斯基·邓内思·A
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中兴通讯股份有限公司
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Publication of WO2013075507A1 publication Critical patent/WO2013075507A1/zh

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Classifications

    • 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
    • H04B10/272—Star-type networks or tree-type networks
    • 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
    • H04B10/03—Arrangements for fault recovery
    • H04B10/032—Arrangements for fault recovery using working and protection systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
    • 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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0057—Operations, administration and maintenance [OAM]
    • H04J2203/006—Fault tolerance and recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0064—Admission Control
    • H04J2203/0067—Resource management and allocation
    • H04J2203/0071—Monitoring
    • 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
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability

Definitions

  • the present invention relates to the field of communications, and in particular to a data transmission method and system.
  • GPON Gigabit-Capable Passive Optical Network
  • EPON Ethernet Passive Optical Network
  • An important branch of technology, similar to other PON technologies, GPON and EPON are passive optical access technologies that use point-to-multipoint topology.
  • the topology of the PON system consists of the Optical Line Terminal (OLT) on the central office, the Optical Network Unit (ONU) on the user side, and the Optical Distribution Network (ODN). Composition, usually a point-to-multipoint network structure.
  • the ODN consists of passive optical components such as single-mode fibers, optical splitters, and optical connectors, providing an optical transmission medium for the physical connection between the OLT and the ONU.
  • the topology structure of the PON system is shown in Figure 1. In the PON system, the data transmission in the downlink direction (from the OLT to the ONU) is broadcast, and each ONU receives all the frames.
  • the ONU of the GPON system obtains the ONU-ID, GEM-Port ID, and Allocation-ID.
  • the own frame, the ONU of the EPON system acquires its own frame according to the LLID and the physical identifier.
  • each ONU For the data transmission in the uplink direction (from the ONU to the OLT), since each ONU needs to share the transmission medium, each ONU should transmit uplink data to the OLT to arrange its own time slot. The distance between each ONU and the OLT is different.
  • the OLT needs to measure the ONU in the registration activation phase. In the GPON, the OLT sends the ranging result of each ONU (for example, the equalization delay value (EqD)) to the corresponding ONU.
  • EqD equalization delay value
  • each ONU Before the ONU sends the uplink data, it needs to delay the time corresponding to the equalization delay value, and then send the uplink data. .
  • each ONU After the OLT completes the ranging of the ONUs in the EPON system, each ONU is allocated an uplink bandwidth according to the ranging result.
  • the PON system provides a protection mode, namely backbone fiber protection, as shown in Figure 2, protecting the backbone fiber between the OLT and the ODN, providing two redundant backbone fibers and two corresponding redundancy.
  • the remaining OLTs are active and standby (also called the primary and backup paths).
  • One backbone fiber and the corresponding OLT (such as OLT1) work normally, and the other backbone fiber and the corresponding OLT (LOT2) are in standby state.
  • the protection switch is performed when the dry fiber or the primary OLT fails, and the standby trunk fiber and the standby OLT become the primary trunk fiber and the primary OLT.
  • the primary OLT and the standby OLT use the same wavelength.
  • the standby OLT cannot dynamically measure the distance of each ONU. Therefore, the OLT after the protection needs to re-measure each ONU.
  • the time required is often long, and the Quality of Service (QoS) of the bearer service cannot be guaranteed.
  • QoS Quality of Service
  • the present invention provides a data transmission method and system to solve at least the above problems, in view of the problem that the ONU cannot quickly recover the service transmission after the protection switching occurs in the PON system in the related art.
  • a data transmission method including: when a primary OLT is switched to a standby OLT, the standby OLT allocates an uplink bandwidth to some or all of the ONUs, and the ONU allocated the uplink bandwidth is itself The uplink data is transmitted within the allocated uplink bandwidth; wherein, the standby OLT and/or the part or all of the ONU does not change the first ranging result before the OLT switching.
  • the standby ONT allocates an uplink bandwidth to some or all of the ONUs, and the ONU that allocates the uplink bandwidth sends uplink data in an uplink bandwidth allocated for itself, including: when the primary 0LT switches to the standby 0LT, the standby 0LT allocates an uplink bandwidth to the part or all of the ONUs; the ONUs that are allocated the uplink bandwidth send uplink data according to the first ranging result allocated by the primary 0LT in the primary channel for each of the allocated uplink bandwidths; or When the primary 0LT is switched to the standby OLT, the standby OLT allocates an uplink bandwidth to the part or all of the ONUs according to the primary ranging result of the primary channel to each ONU according to the primary OLT; The ONU of the upstream bandwidth transmits the uplink data for each of the allocated uplink bandwidths.
  • the sending process of the uplink data further includes: the standby OLT acquires a second ranging result of the ONU of each allocated uplink bandwidth in the standby channel; and the standby OLT continues to perform according to the second ranging result.
  • the uplink data is transmitted between the ONUs to which the uplink bandwidth is allocated.
  • the standby OLT obtains the second ranging result of the 0NU allocated to the uplink bandwidth in the standby channel
  • the method includes: the standby OLT acquiring the 0NU of the allocated uplink bandwidth in the primary channel and the The ranging difference between the alternate channels, the second ranging result is obtained according to the ranging difference and the first ranging result; or the standby OLT receives the uplink of the ONU transmitted by the allocated uplink bandwidth Frame, directly calculating the second ranging result.
  • the types of the first ranging result and the second ranging result include: an equalization delay value EqD, a loop delay value RTD, or a loop time RTT.
  • the standby OLT acquires a ranging difference between the primary channel and the backup channel of the ONU to which the uplink bandwidth is allocated, and the method includes: the standby OLT calculates the ONU sent by the allocated uplink bandwidth. The difference between the actual arrival time value of the uplink data and the arrival time value of the uplink data sent by the ONU that the standby OLT wants to allocate the uplink bandwidth, and the difference between the arrival time values is the ranging difference value; Or the standby OLT measures a ranging value of the ONU allocated to the uplink bandwidth in the standby path, and calculates a ranging value of the ONU allocated to the uplink bandwidth in the primary path and the standby path.
  • the difference between the ranging values, and the difference between the ranging values is the ranging difference.
  • the standby OLT continues to send and receive the uplink data between the ONUs that are allocated the uplink bandwidth according to the second ranging result, and the method includes: the standby OLT adopts each second ranging result. Sending to the ONU corresponding to the second ranging result, wherein the corresponding ONU updates its own ranging value according to the second ranging result; the standby OLT allocates an uplink bandwidth to the corresponding ONU again. The corresponding ONU sends the uplink data by using the updated ranging value; or the standby OLT determines the arrival time of the uplink data according to the second ranging result, and receives the uplink data according to the arrival time. .
  • the standby OLT obtains the second ranging result by using any one of the following methods: the standby OLT allocates the uplink to the The ONU of the bandwidth is re-ranged to obtain the second ranging result; the standby OLT interacts with the ONU that is allocated the uplink bandwidth to obtain the second ranging result.
  • the specified message includes at least one of the following: a physical layer operation management maintenance PLOAM message, an ONU management control interface OMCI message, and a gigabit encapsulation method GEM frame.
  • the method further includes: the standby OLT acquiring the identifier information of the part or all the ONUs as follows: the standby OLT receiving the location sent by the primary OLT The identifier information is obtained; or the standby OLT listens to the uplink frame sent by the part or all the ONUs to obtain the identifier information.
  • the identifier information includes at least one of the following: 0NU-ID, MAC address, sequence number information, logical link identifier, equalization delay value, loop delay value, loop time, transmission container, and gigabit encapsulation Method port ID.
  • the method before the primary OLT switches to the standby OLT, the method further includes: the primary OLT broadcasting configuration profile information corresponding to the standby channel.
  • the uplink bandwidth allocated by the standby OLT to some or all of the ONUs includes: a guard time between the uplink bandwidth allocated by the standby OLT for the part or all of the ONUs is greater than the primary OLT is the part. Or guard time between the upstream bandwidth allocated by all ONUs.
  • the method further includes: the standby OLT synchronizing the uplink frames sent by the part or all the ONUs.
  • the method further includes: if some or all of the ONUs in the ONU to which the uplink bandwidth is allocated are returned to the initial state, the ONU returning to the initial state is re-registered and activated. After the process, it enters the working state.
  • a data transmission system including a backup OLT and an ONU: the backup OLT is configured to allocate an uplink bandwidth to some or all of the ONUs when the primary OLT is switched to the standby OLT; The ONU that allocates the uplink bandwidth is configured to send uplink data in an uplink bandwidth allocated for itself, wherein the standby OLT and/or the part or all of the ONUs do not change the first ranging result before the OLT handover.
  • the standby OLT is further configured to allocate an uplink bandwidth to some or all of the ONUs when the primary OLT switches to the standby OLT; and the ONUs that are allocated the uplink bandwidth are also set to be allocated in the respective uplink bandwidths.
  • the standby OLT is further configured to: when the primary OLT switches to the standby OLT, according to the primary OLT And allocating an uplink bandwidth to the part or all of the ONUs by using the first ranging result of the primary channel to the ONUs; and the ONUs allocated with the uplink bandwidth are further configured to send the uplink data in the uplink bandwidth allocated for each.
  • the standby OLT when the primary OLT switches to the standby OLT, the standby OLT allocates uplink bandwidth to some or all of the ONUs, and the ONUs that are allocated the uplink bandwidth send uplink data in the uplink bandwidth allocated for itself; / or some or all of the ONUs do not change the first ranging result before the OLT switch. That is, in the embodiment of the present invention, after the primary OLT cannot communicate with the ONU, when the active and standby OLTs switch, the standby OLT and some or all of the ONUs do not change the first ranging result before the OLT switching, and do not need to be used for each ONU.
  • FIG. 1 is a structural diagram of a passive optical network according to the related art
  • FIG. 2 is a schematic diagram of a main fiber protection structure of type B in a passive optical network protection mode according to the related art;
  • the first processing flowchart of the data transmitting method of the embodiment is a second processing flowchart of the data transmitting method according to the embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of the data transmitting system according to the embodiment of the present invention.
  • the backup OLT cannot dynamically measure the distance of each ONU in real time when the primary OLT is working normally. Therefore, the OLT after the protection needs to be protected.
  • the ONU can perform normal ranging to work normally. The time required is often long, and the QoS of the bearer service cannot be guaranteed.
  • the embodiment of the present invention provides a data sending method, and the processing flow is as follows:
  • the standby OLT allocates uplink bandwidth to some or all of the ONUs, and the ONU to which the uplink bandwidth is allocated is
  • the uplink data is sent in the uplink bandwidth allocated for itself; wherein the standby OLT and/or some or all of the ONUs do not change the first ranging result before the OLT handover.
  • the standby OLT allocates uplink bandwidth to some or all of the ONUs, and the ONUs that are allocated the uplink bandwidth send uplink data in the uplink bandwidth allocated for itself; / or some or all of the ONUs do not change the first ranging result before the OLT switch.
  • the standby OLT and some or all of the ONUs do not change the first ranging result before the OLT switching, and do not need to re-execute each ONU.
  • the application body of the first ranging data may be a standby OLT or an ONU, and is specifically described according to the main body.
  • the embodiment of the present invention provides a data transmission method.
  • the processing flow is as shown in FIG. 3, and includes steps S302 to S304.
  • Step S302 When the primary OLT switches to the standby OLT, the standby OLT is Some or all of the ONUs allocate uplink bandwidths.
  • Step S304 The ONUs that are allocated the uplink bandwidths send uplink data according to the first ranging result allocated by the primary OLT in the primary channel for each of the allocated uplink bandwidths.
  • the standby OLT allocates uplink bandwidth to some or all of the ONUs, and the ONUs that are allocated the uplink bandwidth are allocated in the primary channel according to the primary OLT for each allocated uplink bandwidth.
  • the first ranging result sends uplink data.
  • the primary OLT does not need to perform ranging for each ONU, but allocates uplink bandwidth directly to some or all of the ONUs.
  • the embodiment of the present invention further provides a data sending method, which is described by using a standby OLT as a main body.
  • the schematic structural diagram is as shown in FIG. 4, and includes steps S402 to S404.
  • Step S402 When the primary OLT switches to the standby OLT, the standby OLT allocates an uplink bandwidth to some or all of the ONUs according to the first ranging result of the primary OLT in the primary channel for each ONU; Step S404, the ONU to which the uplink bandwidth is allocated.
  • the uplink data is transmitted within the uplink bandwidth allocated for each.
  • the standby OLT when the primary OLT switches to the standby OLT, the standby OLT allocates uplink bandwidth to some or all of the ONUs according to the first ranging result of the primary OLT in the primary channel, and is allocated an ONU of the uplink bandwidth.
  • the uplink data is transmitted within the uplink bandwidth allocated for each.
  • the backup OLT does not need to re-enter each ONU.
  • the time is shortened to ensure the QoS of the bearer service.
  • the standby OLT is an uplink bandwidth allocation using the first measurement result measured by the primary OLT on the primary channel or the ONU is an uplink using the first measurement result.
  • Data transmission ie, its associated operations or applications, relies on the first measurement, that is, on the data of the primary channel.
  • the primary channel and the alternate channel have their own differences. For example, the lengths of the primary channel and the secondary channel are different. Therefore, there is a certain difference between the time when the uplink data arrives at the standby OLT and the primary OLT.
  • the standby OLT acquires the second ranging result of the ONUs of each allocated uplink bandwidth in the standby channel; the standby OLT according to the second ranging result The transmission and reception of uplink data are continued between the ONUs to which the uplink bandwidth is allocated.
  • the standby OLT obtains the second ranging result of the allocated ONU in the standby channel, and may adopt any one of the following implementation manners: First, the standby OLT acquires the ONU allocated the uplink bandwidth between the active channel and the standby channel. The ranging difference is obtained according to the ranging difference and the first ranging result. Second, the standby OLT receives the uplink frame transmitted by the ONU to which the uplink bandwidth is allocated, and directly calculates the second ranging result.
  • the types of the first ranging result and the second ranging result may include: an equalization delay value (EqD), a loop delay value (RTD), or a loop time (RTT).
  • EqD equalization delay value
  • RTD loop delay value
  • RTT loop time
  • the ranging result can also adopt other types, which can reflect the ranging result.
  • the standby OLT calculates the difference between the actual time value of the uplink data sent by the ONU to which the uplink bandwidth is allocated and the time value of the uplink data sent by the ONU that the standby OLT wants to allocate the uplink bandwidth, and the difference between the arrival time values is taken.
  • the value is the ranging difference.
  • Embodiment 2 The standby OLT measures the ranging value of the ONU allocated to the uplink bandwidth in the standby path, and calculates the difference between the ranging value of the ONU allocated to the uplink bandwidth and the ranging value of the standby path, and takes the ranging.
  • the difference is the ranging difference.
  • the standby OLT may send the ranging difference to the ONU, and the ONU may determine the second ranging result according to the ranging difference and the first ranging result, and then allocate according to the second ranging result.
  • the uplink data is transmitted on the uplink bandwidth.
  • the standby OLT determines a second ranging result according to the ranging difference value and the first ranging result, and allocates an uplink bandwidth to the ONU according to the second ranging result.
  • the standby OLT may further send each second ranging result to the second ranging result.
  • the ONU in which the corresponding ONU updates its own ranging value according to the second ranging result; the standby OLT allocates an uplink bandwidth to the corresponding ONU again, and the corresponding ONU sends the uplink data by using the updated ranging value.
  • the standby OLT may not notify the ONU of the second ranging result, but determine the arrival time of the uplink data according to the second ranging result, and receive the uplink data according to the arrival time.
  • the backup is performed after the standby OLT establishes communication with the ONU to which the upstream bandwidth is allocated.
  • the OLT obtains the second ranging result by using any one of the following methods: First, the standby OLT re-ranges the ONU to which the uplink bandwidth is allocated, and obtains the second ranging result; Second, the standby OLT and the allocated uplink bandwidth The ONU interaction specifies a message to obtain the second ranging result.
  • the second method may specify multiple types of messages, preferably at least one of the following: a PLOAM message, an OMCI message, and a GEM frame.
  • the backup OLT needs to obtain the identifier information of the ONU, and the manner of obtaining the OLT may be multiple, preferably, may include
  • the standby OLT receives the identifier information sent by the primary OLT; or the standby OLT listens to the uplink frame sent by some or all of the ONUs to obtain the identifier information.
  • the identifier information includes at least one of the following: an ONU-ID, a MAC address, a sequence number information, a logical link identifier, an equalization delay value, a loop delay value, a loop time, a transmission container, and a gigabit encapsulation method port identifier. . If the standby OLT is used to monitor the uplink frame sent by some or all of the ONUs, the standby OLT may listen to the following part or all of the content in the uplink frame to obtain the identifier information of the ONU: a PLOAM message, an OMCI message, and a GEM frame.
  • the primary OLT before the primary OLT switches to the standby OLT, to ensure that the ONU can learn the configuration profile information of the corresponding backup path, the primary OLT broadcasts the profile information corresponding to the backup channel, and notifies the ONU of the information about the alternate channel.
  • the uplink bandwidth allocated by the standby OLT to some or all of the ONUs has the following characteristics: The guard time between the uplink bandwidth allocated by the standby OLT for some or all of the ONUs is greater than the uplink bandwidth allocated by the primary OLT to some or all of the ONUs. Guard time between.
  • the ONU sends uplink data in the uplink bandwidth with this feature to prevent the uplink frame from reaching the standby OLT at the same time, and further guarantees the QoS of the bearer service.
  • the standby OLT allocates uplink bandwidth to some or all of the ONUs, the standby
  • the OLT can directly synchronize the upstream frames sent by some or all of the ONUs.
  • some or all of the ONUs may exit the registration state due to the handover of the OLT and the communication channel, that is, return to the initial state.
  • the ONU returning to the initial state should be re-passed.
  • the registration activation process After the registration activation process, it enters the working state.
  • Embodiment 3 This embodiment describes the data transmission method in detail.
  • Step A The ONU-ID obtaining method
  • the primary OLT sends the following part or all of the information of the ONU to the standby OLT: ONU-ID, MAC address, serial number information, logical link identifier, equalization delay value, and loop delay
  • the value, the loop time, the transmission container, the Gigabit encapsulation method port identifier, or the standby OLT listens to the uplink frame sent by the ONU to obtain some or all of the above information, in the following manner:
  • the standby OLT monitors the PLOAM message and the OMCI message sent by the ONU. And/or GEM frames obtain ONU-ID, ranging results.
  • the standby OLT monitors the uplink frame sent by the ONU, and the standby OLT monitors the uplink frame sent by the ONU to the primary OLT.
  • the standby OLT obtains some or all of the following information through the PLOAM message, the OMCI message, and/or the GEM frame in the uplink frame: ONU-ID , MAC address, serial number information, logical link identifier, equalization delay value, loop delay value, loop time, transport container, gigabit encapsulation method port identifier.
  • Step B Reuse EqD: After the primary OLT cannot communicate with the ONU, the standby OLT allocates uplink bandwidth to some or all of the ONUs.
  • the guard time between the upstream bandwidth allocated by the standby OLT to the ONU is greater than that allocated by the primary OLT to the ONU. Protection time between upstream bandwidths.
  • the ONU transmits the uplink data according to the ranging result allocated by the primary OLT in the uplink bandwidth, or the backup OLT allocates the uplink bandwidth to the ONU according to the ranging result of the primary OLT to the ONU, and the ONU sends the uplink data in the uplink bandwidth.
  • Step C The difference between the active and standby channels EqD or the RTT and EqD obtains the method for the standby OLT to synchronize the uplink frame. After the standby OLT allocates the uplink bandwidth to the ONU, the standby OLT starts to synchronize the uplink frame.
  • the standby OLT obtains the ranging difference that needs to be adjusted by the ONU in step B according to the difference between the actual arrival time of the uplink data sent by the ONU and the arrival time of the uplink data sent by the standby OLT.
  • the standby OLT is based on the ONU.
  • the difference between the RTD value of the primary path and the RTD value of the ONU measured by the standby OLT obtains the ranging difference that the ONU needs to adjust, or the OLT allocates bandwidth to the ONU according to the ranging result of the primary OLT to the ONU.
  • When receiving the uplink frame of the ONU directly calculate the ranging value of the ONU in the alternate channel.
  • Step D The standby OLT calculates the ranging result and sends the result to the ONU.
  • the ONU updates the EqD.
  • the standby OLT calculates the ranging value of the ONU or the ranging difference that the ONU needs to adjust, and then uses the ranging value or the ranging difference that the ONU needs to adjust.
  • the value is sent to the corresponding ONU.
  • the ONU After receiving the above information sent by the standby OLT, the ONU updates its own ranging value, and sends the uplink data with the new ranging value after receiving the uplink bandwidth allocated by the standby OLT again.
  • Step E After the standby OLT establishes communication with the ONU, the OLT can obtain the ranging result value of the ONU in the standby path by one of the following methods: Method 1: The OLT re-measures the ONU to obtain the ranging result value of the ONU; The OLT obtains the ranging result value of the ONU by interacting with the ONU to interact with the PLOAM message, the OMCI message, or the GEM frame. Step F: After the active OLT cannot communicate with the ONU, the standby OLT allocates uplink bandwidth to some or all of the ONUs. If some or all of the ONUs return to the initial state, the ONUs returning to the initial state enter the working state after the registration activation process. .
  • the ranging result is an equalization delay value, a loop delay value, or a loop time.
  • the service transmission can be quickly restored, and the service quality of the network is improved.
  • Example 4 GPON mechanism
  • the first optical line terminal OLT1 passes through the optical splitter to reach the ONU path as the primary path, and the second light
  • the path through which the line terminal OLT2 reaches the ONU through the optical splitter is an alternate path.
  • ONU ID information (ONU-ID) of the ONU that OLT1 will manage The OLT2 is sent to the OLT 2.
  • the primary OLT may also send the following part or all of the information of the ONU to the standby OLT: ONU-ID, sequence number information, equalization delay value, loop delay value, and transmission container
  • the OLT 2 monitors the uplink frame sent by the ONU to the OLT 1 to obtain the ONU identification information.
  • the OLT 2 can also monitor the uplink frame sent by the ONU to the OLT 1 to obtain the following part or All information: ONU-ID, serial number information, equalization delay value, loop delay value, transmission container, gigabit encapsulation method port identifier.
  • OLT2 monitors the upstream frame sent by the ONU to OLT1, and OLT2 passes PLOAM in the upstream frame.
  • Messages, OMCI messages, and/or GEM frames obtain some or all of the above information).
  • the primary OLT broadcasts profile information corresponding to the primary channel and the alternate channel.
  • the primary path serves as a service path for the optical network unit and the optical line terminal. After the primary path is interrupted or the primary OLT fails, the ONU enters a downlink signal loss state (06 state), enabling the alternate path and the OLT 2 to manage all ONUs.
  • the standby OLT sends the downlink frame, and some or all of the ONUs complete the downlink frame synchronization and enter the working state (05); or the standby OLT sends a direct POU-UP message (directed POP-UP messages) to some or all of the ONUs, and the ONU of the 06 state is received.
  • the ONU and OLT2 use the following steps to complete the update of the EQD value of the ONU: Step 1: OLT2 allocates uplink bandwidth to each ONU, and OLT2 allocates uplink bandwidth to the ONU.
  • the guard time is greater than the guard time between the upstream bandwidth allocated by the OLT1 to the ONU.
  • the upstream bandwidth corresponds to a longer preamble.
  • Step 2 Each ONU is equal to the OLT1 equalization in the uplink bandwidth allocated by the OLT2.
  • the delay EqD1 sends uplink data to the OLT2.
  • the uplink frame sent to OLT1 obtains the content), where RTD1 is the RTD value of the ONU in the primary path, and RTD2 is the RTD value of the ONU in the alternate path.
  • Step 4 After receiving the AEqD value sent by the OLT2, each ONU updates its own EqD value, that is, it is updated to the equalization delay value EqD2 corresponding to the OLT2:
  • EqD2 EqDl — AEqD.
  • Step 5 The OLT2 allocates an uplink bandwidth to the ONU that updates the equalization delay, and the guard time between the uplink bandwidth allocated by the OLT2 to the ONUs that both update the equalization delay is equal to the uplink bandwidth allocated by the OLT1 to the ONU.
  • the protection time between the ONUs and the ONU receives the uplink bandwidth allocated by the OLT2, and sends the uplink data according to the updated equalization delay EqD2 to implement uplink data synchronization.
  • the OLT can obtain the EqD value of the ONU in the standby path according to one of the following methods: Method 1: The OLT re-measures the ONU to obtain the ranging result value of the ONU; The OLT obtains the ranging result value of the ONU by interacting with the ONU to interact with the PLOAM message, the OMCI message, or the GEM frame.
  • the EqD value can be selected and sent to the corresponding one as needed.
  • step 1 if some or all of the ONUs return to the initial state, the ONUs returning to the initial state enter the working state after the registration activation process.
  • the OLT 2 sends the difference of the EqD that the ONU needs to adjust to the ONU.
  • the following method may also be used:
  • the OLT1 sends the EqD1 of all the ONUs to the OLT2, and the OLT2 calculates according to the above method.
  • the OLT 2 sends the difference of the EQD that the ONU needs to adjust to the ONU.
  • the following steps may be used to restore the communication of the ONU: Step 1: The OLT2 allocates uplink bandwidth to each ONU. The guard time between the upstream bandwidth allocated by the OLT2 to the ONU is greater than the guard time between the upstream bandwidth allocated by the OLT1 to the ONU, and the upstream bandwidth corresponds to a longer preamble; Step 2: Each ONU allocates itself to the OLT2. In the uplink bandwidth, the uplink data is transmitted to the OLT 2 with the equalization delay EqD1 corresponding to the OLT1. Step 3: OLT2 starts synchronizing the upstream frames sent by the ONU.
  • the OLT 2 starts synchronizing the uplink frame sent by the ONU. Specifically, after the optical module of the OLT 2 detects the uplink optical signal, it immediately sends a reset signal to synchronize the uplink data. After the protection switching occurs, the ONU continues to use the EqD allocated by the OLT1, and does not need to adjust the value of the EqD. After the OLT2 synchronizes to the uplink frame sent by the ONU in step 3, the OLT2 obtains the actual arrival time of the uplink frame sent by the ONU, and the OLT2 can The actual arrival time value of the uplink data of all subsequent ONUs is estimated, and the uplink data is received according to the time.
  • the OLT2 directly allocates the uplink bandwidth to the ONU.
  • the OLT2 may also first send an uplink overhead (upstream_overhead) message to the ONU, and the number of leading bytes in the upstream_overhead message.
  • the ONU receives and stores the above upstream_overhead message, and then the OLT allocates the uplink bandwidth to the ONU.
  • the preamble in the uplink burst sent by the ONU in the uplink bandwidth allocated to itself is the preamble value carried in the upstream-overhead message.
  • the OLT2 synchronizes the uplink frame sent by the ONU.
  • the OLT1 and the OLT2 before the protection switching occurs, complete the ranging of the ONU in the standby path, and the OLT2 saves the ONU. Ranging result of the alternate path.
  • the OLT2 After the protection switching occurs, after the OLT2 allocates the uplink bandwidth to the ONU, the OLT2 can directly receive the uplink frame according to the prior art.
  • Example 5 EPON mechanism
  • the first optical line terminal OLT1 passes through the optical splitter to reach the ONU path as the primary path, and the second light
  • the path through which the line terminal OLT2 reaches the ONU through the optical splitter is an alternate path.
  • the OLT1 sends the ONU logical link identifier (LLID) of the ONU it manages to the OLT2.
  • the OLT1 may also send the following part or all of the information of the ONU to the OLT2: LLID, MAC address, and loop time value.
  • the OLT2 can be used to monitor the uplink frame sent by the ONU to the OLT1 to obtain the LLID of the ONU.
  • the OLT2 can also monitor the uplink frame sent by the ONU to the OLT1 to obtain some or all of the following information: LLID, MAC address The loop time value and the VLAN information.
  • the OLT 2 monitors the uplink frame sent by the ONU to the OLT 1.
  • the OLT 2 obtains some or all of the information by using the eOAM message, the OMCI message, or other parts of the uplink frame in the uplink frame.
  • the primary path serves as a service path for the optical network unit and the optical line terminal. After the primary path is interrupted or the primary OLT fails, the alternate path is enabled and the OLT 2 manages all ONUs.
  • OLTl manages ONUs at OLT2 Previously, all ONUs are sent to the OLT 2 in the ranging result loop time value RTT1 of the primary path, and the OLT 2 stores the above information.
  • Step 1 The OLT2 allocates uplink bandwidth to each ONU according to the RTT1 of each ONU, and the guard time between the upstream bandwidth allocated by the OLT2 to the ONU is greater than the uplink allocated by the OLT1 to the ONU.
  • the protection time between the bandwidths Step 2: Each ONU sends uplink data in the uplink bandwidth allocated by OLT2 to itself.
  • Step 3 The OLT2 starts to synchronize the uplink frame sent by the ONU.
  • Mode 2 The OLT calculates the RTT value of the ONU in the alternate path.
  • the OLT 2 allocates uplink bandwidth to each ONU according to the RTT2 of each ONU.
  • the OLT can re-range the ONU according to the requirement, obtain the ranging result value RTT of the ONU, and allocate the uplink bandwidth to the ONU according to the RTT value.
  • step 1 if some or all of the ONUs return to the initial state, the ONUs returning to the initial state enter the working state after the registration activation process.
  • the OLT 2 calculates the RTT2 value of the ONU in the standby channel.
  • the ONU communication may be restored only by the following steps:
  • the ONU and the OLT 2 establish communication by the following steps: Step 1: The OLT 2 follows The RTT1 of each ONU allocates an uplink bandwidth to each ONU, and the guard time between the upstream bandwidth allocated by the OLT2 to the ONU is greater than the guard time between the upstream bandwidth allocated by the OLT1 to the ONU.
  • the uplink data is sent within the uplink bandwidth allocated by itself.
  • Step 3 OLT2 starts synchronizing the upstream frames sent by the ONU.
  • the embodiment of the present invention further provides a data transmission system.
  • the schematic diagram of the structure is as shown in FIG.
  • the standby OLT 501 when the primary OLT is set to switch to the standby OLT 501.
  • the ONU 502 does not change the first ranging result before the OLT switch.
  • the standby OLT 501 may also be configured to allocate an uplink bandwidth to some or all of the ONUs 502 when the primary OLT switches to the standby OLT 501; the ONU 502 to which the upstream bandwidth is allocated, coupled with the standby OLT 501. And, in the uplink bandwidth allocated for each, the uplink data may be sent according to the first ranging result allocated by the active OLT in the primary channel; or the standby OLT 501 may also be configured to switch to the standby OLT 502 in the primary OLT.
  • the uplink bandwidth is allocated to some or all of the ONUs 502 according to the first ranging result of the active OLT on the primary channel by the primary OLT; the ONU 502 to which the upstream bandwidth is allocated is coupled with the standby OLT 501, and may also be set to be
  • the uplink data is transmitted within the allocated uplink bandwidth. From the above description, it can be seen that the present invention achieves the following technical effects: In the embodiment of the present invention, when the primary OLT switches to the standby OLT, the standby OLT allocates uplink bandwidth to some or all of the ONUs, and allocates uplink bandwidth.
  • the ONUs transmit uplink data according to the first ranging result allocated by the primary OLT in the primary channel for each of the allocated uplink bandwidths.
  • the backup OLT does not need to perform ranging for each ONU, but directly allocates uplink bandwidth to some or all of the ONUs.
  • the ONU continues to use the first ranging result allocated by the active OLT in the primary channel to send uplink data, so that the time required for the standby OLT to perform normal work is shortened, and the QoS of the bearer service is guaranteed.
  • the standby OLT when the primary OLT switches to the standby OLT, the standby OLT allocates uplink bandwidth to some or all of the ONUs, and the ONUs that are allocated the uplink bandwidth send uplink data in the uplink bandwidth allocated for itself; / or some or all of the ONUs do not change the first ranging result before the OLT switch. That is, in the embodiment of the present invention, after the primary OLT cannot communicate with the ONU, when the active and standby OLTs switch, the standby OLT and some or all of the ONUs do not change the first ranging result before the OLT switching, and do not need to be used for each ONU.

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Abstract

本发明公开了一种数据发送方法及系统，该方法包括：主用OLT切换至备用OLT时，备用OLT为部分或者全部ONU分配上行带宽，被分配上行带宽的ONU在为自身分配的上行带宽内发送上行数据；其中，备用OLT和/或部分或者全部ONU不改变OLT切换之前的第一测距结果。采用本发明能够解决相关技术中PON系统中发生保护倒换后ONU不能快速恢复业务传输的问题。

Description

数据发送方法及系统 技术领域 本发明涉及通信领域， 具体而言， 涉及一种数据发送方法及系统。 背景技术 吉比特无源光网络（ Gigabit-Capable Passive Optical Network, GPON)技术和以太 网无源光网络 (Ethernet Passive Optical Network, EPON)是无源光网络（Passive Optical Network, PON)家族中两个重要的技术分支，和其它 PON技术类似， GPON和 EPON 也是采用点到多点拓扑结构的无源光接入技术。
PON系统的拓扑结构由局侧的光线路终端 （Optical Line Terminal, 简称为 OLT)、 用户侧的光网络单元 （Optical Network Unit, 简称为 ONU) 以及光分配网络 （Optical Distribution Network, 简称为 ODN)组成， 通常采用点到多点的网络结构。 ODN由单 模光纤、 分光器、 光连接器等无源光器件组成， 为 OLT和 ONU之间的物理连接提供 光传输媒质。 PON系统的拓扑结构示意图如图 1所示。 在 PON系统中， 下行方向（由 OLT到 ONU)的数据传输采用广播方式， 每个 ONU 分别接收所有的帧， GPON系统的 ONU再根据 ONU-ID、 GEM-Port ID、 Allocation-ID 来获取属于自己的帧， EPON系统的 ONU根据 LLID、物理标识来获取属于自己的帧。 对于上行方向（从 ONU到 OLT)的数据传输， 由于各个 ONU需要共享传输媒质， 因此各个 ONU应该在 OLT安排给自己的时隙内传输上行数据。 各个 ONU与 OLT之 间的距离不同， 为防止各个 ONU发送的上行数据同时到达 OLT， OLT需要对处于注 册激活阶段的 ONU进行测距。 在 GPON中 OLT将每个 ONU的测距结果 （例如均衡 时延值 （EqD)) 分别发送给对应 ONU， ONU发送上行数据之前需要延时上述均衡时 延值对应的时间， 然后再发送上行数据。 EPON系统中 OLT完成对 ONU的测距后， 按照测距结果给每个 ONU分配上行带宽。 为了考虑可靠性， PON系统提供了一种保护方式， 即主干光纤保护，如图 2所示， 对 OLT和 ODN之间的主干光纤进行保护， 提供两条冗余主干光纤及两个相应的冗余 OLT, 互为主备 （也称为主用通路和备用通路）， 一条主干光纤及相应的 OLT (例如 OLT1 ) 正常工作， 另一条主干光纤及相应的 OLT (LOT2) 处于备用状态， 当主用主 干光纤或者主用 OLT故障时进行保护切换， 备用主干光纤及备用 OLT成为主用主干 光纤和主用 OLT。 由于主用 OLT和备用 OLT下行采用相同波长， 在主用 OLT正常工作的情况下， 备用 OLT无法对各个 ONU动态实时地进行测距，因此保护切换后的 OLT需要对各个 ONU重新进行测距才能正常工作， 所需时间往往较长， 无法保证承载业务的服务质量 ( Quality of Service, QoS )。 目前还没有一种统一有效的方法可以实现备用 0LT变为主用 0LT后 0NU能够迅 速恢复业务传输的目的。 针对相关技术中 PON系统中发生保护倒换后 ONU不能快速恢复业务传输的问 题， 目前尚未提出有效的解决方案。 发明内容 针对相关技术中 PON系统中发生保护倒换后 ONU不能快速恢复业务传输的问 题， 本发明提供了一种数据发送方法及系统， 以至少解决上述问题。 根据本发明的一个方面， 提供了一种数据发送方法， 包括： 主用 0LT切换至备用 0LT时， 所述备用 0LT为部分或者全部 0NU分配上行带宽， 所述被分配上行带宽的 0NU在为自身分配的上行带宽内发送上行数据； 其中， 所述备用 0LT和 /或所述部分 或者全部 0NU不改变 0LT切换之前的第一测距结果。 优选的， 所述备用 0LT为部分或者全部 0NU分配上行带宽， 所述被分配上行带 宽的 0NU在为自身分配的上行带宽内发送上行数据，包括：主用 0LT切换至备用 0LT 时， 所述备用 0LT为所述部分或全部 0NU分配上行带宽； 被分配上行带宽的 0NU 在为各自分配的上行带宽内按照所述主用 0LT 在主用通道分配的第一测距结果发送 上行数据； 或者， 所述主用 0LT切换至所述备用 0LT时， 所述备用 0LT按照所述主 用 0LT在所述主用通道对各 0NU的第一测距结果给所述部分或全部 0NU分配上行 带宽； 被分配上行带宽的 0NU在为各自分配的上行带宽内发送所述上行数据。 优选的， 所述上行数据的发送过程还包括： 所述备用 0LT获取各被分配上行带宽 的 0NU在备用通道的第二测距结果； 所述备用 0LT根据所述第二测距结果继续与所 述被分配上行带宽的 0NU间进行所述上行数据的发送。 优选的， 所述备用 0LT获取所述被分配上行带宽的 0NU在备用通道的第二测距 结果， 包括： 所述备用 0LT获取所述被分配上行带宽的 0NU在所述主用通道与所述 备用通道间的测距差值， 根据所述测距差值与所述第一测距结果获取所述第二测距结 果； 或者所述备用 OLT接收所述被分配上行带宽的 ONU传输的上行帧， 直接计算所 述第二测距结果。 优选的， 所述第一测距结果和所述第二测距结果的类型包括： 均衡时延值 EqD、 环路时延值 RTD或者环路时间 RTT。 优选的， 所述备用 OLT获取所述被分配上行带宽的 ONU在所述主用通道与所述 备用通道间的测距差值， 包括： 所述备用 OLT计算所述被分配上行带宽的 ONU发送 的上行数据实际到达的时间值与所述备用 OLT希望所述被分配上行带宽的 ONU发送 的上行数据的到达时间值的差值， 取该到达时间值的差值为所述测距差值； 或者， 所 述备用 OLT测量所述被分配上行带宽的 ONU在所述备用通路的测距值， 计算所述被 分配上行带宽的 ONU在所述主用通路的测距值和所述备用通路的测距值的差值， 取 该测距值的差值为所述测距差值。 优选的，所述备用 OLT根据所述第二测距结果继续与所述被分配上行带宽的 ONU 间进行所述上行数据的发送与接收， 包括： 所述备用 OLT将每个第二测距结果发送给 与该第二测距结果对应的 ONU， 其中， 所述对应的 ONU根据该第二测距结果更新自 身的测距值； 所述备用 OLT再次为所述对应的 ONU分配上行带宽， 所述对应的 ONU 采用更新后的测距值发送所述上行数据；或者所述备用 OLT根据所述第二测距结果判 断所述上行数据的到达时间， 并根据所述到达时间接收所述上行数据。 优选的，所述备用 OLT与所述被分配上行带宽的 ONU建立通信后，所述备用 OLT 通过下列任意之一的方法获取所述第二测距结果：所述备用 OLT对所述被分配上行带 宽的 ONU重新测距， 获取所述第二测距结果； 所述备用 OLT与所述被分配上行带宽 的 ONU交互指定消息获取所述第二测距结果。 优选的， 所述指定消息包括下列至少之一： 物理层操作管理维护 PLOAM消息、 ONU管理控制接口 OMCI消息以及吉比特封装方法 GEM帧。 优选的， 所述主用 OLT切换至备用 OLT之后或者之前， 还包括： 所述备用 OLT 按如下方式获取所述部分或全部 ONU的标识信息： 所述备用 OLT接收所述主用 OLT 发送的所述标识信息； 或者所述备用 OLT监听所述部分或全部 ONU发送的上行帧， 获取所述标识信息。 优选的， 所述标识信息包括下列至少之一： 0NU-ID、 MAC地址、 序列号信息、 逻辑链路标识、 均衡时延值、 环路时延值、 环路时间、 传输容器以及吉比特封装方法 端口标识。 优选的， 所述主用 OLT切换至备用 OLT之前， 还包括： 所述主用 OLT广播对应 备用通道的配置 Profile信息。 优选的， 所述备用 OLT为部分或全部 ONU分配的上行带宽包括： 所述备用 OLT 为所述部分或全部 ONU分配的上行带宽之间的保护时间 guard time大于所述主用 OLT 为所述部分或全部 ONU分配的上行带宽之间的 guard time。 优选的， 所述备用 OLT为部分或全部 ONU分配上行带宽之后， 还包括： 所述备 用 OLT同步所述部分或全部 ONU发送的上行帧。 优选的， 所述备用 OLT给部分或全部 ONU分配上行带宽之后， 还包括： 若所述 被分配上行带宽的 ONU中部分或全部 ONU回到初始状态， 则回到初始状态的 ONU 重新经过注册激活过程后进入工作状态。 根据本发明的另一方面， 提供了一种数据传输系统， 包括备用 OLT和 ONU: 所 述备用 OLT， 设置为主用 OLT切换至备用 OLT时， 为部分或者全部 ONU分配上行带 宽； 所述被分配上行带宽的 ONU， 设置为在为自身分配的上行带宽内发送上行数据， 其中， 所述备用 OLT和 /或所述部分或者全部 ONU不改变 OLT切换之前的第一测距 结果。 优选的， 所述备用 OLT， 还设置为在主用 OLT切换至所述备用 OLT时， 为部分 或全部 ONU分配上行带宽； 被分配上行带宽的 ONU， 还设置为在为各自分配的上行 带宽内按照所述主用 OLT在主用通道分配的第一测距结果发送上行数据；或者所述备 用 OLT， 还设置为在所述主用 OLT切换至所述备用 OLT时， 按照所述主用 OLT在所 述主用通道对各 ONU的第一测距结果给所述部分或全部 ONU分配上行带宽；被分配 上行带宽的 ONU， 还设置为在为各自分配的上行带宽内发送所述上行数据。 在本发明实施例中，主用 OLT切换至备用 OLT时，备用 OLT为部分或者全部 ONU 分配上行带宽， 被分配上行带宽的 ONU在为自身分配的上行带宽内发送上行数据； 其中， 备用 OLT和 /或部分或者全部 ONU不改变 OLT切换之前的第一测距结果。 即， 在本发明实施例中， 主用 OLT不能与 ONU通信后， 主备 OLT发生切换时， 备用 OLT 以及部分或全部 ONU不改变 OLT切换之前的第一测距结果， 并不需要对各个 ONU 重新进行测距， 而是继续使用主用 OLT 在主用通道分配的第一测距结果发送上行数 据， 使得备用 OLT进行正常工作所需时间被缩短， 保证承载业务的 QoS。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部分， 本发 明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的不当限定。 在附图 中： 图 1是根据相关技术的无源光网络的组成结构图； 图 2 是根据相关技术的无源光网络保护模式下类型 B 的主干光纤保护结构示意 图； 图 3是根据本发明实施例的数据发送方法的第一种处理流程图； 图 4是根据本发明实施例的数据发送方法的第二种处理流程图； 图 5是根据本发明实施例的数据发送系统的结构示意图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在不冲突的 情况下， 本申请中的实施例及实施例中的特征可以相互组合。 相关技术中提到， 由于主用 OLT和备用 OLT下行采用相同波长， 在主用 OLT正 常工作的情况下， 备用 OLT无法对各个 ONU动态实时地进行测距， 因此保护切换后 的 OLT需要对各个 ONU重新进行测距才能正常工作， 所需时间往往较长， 无法保证 承载业务的 QoS。 为解决上述技术问题，本发明实施例提供了一种数据发送方法，其处理流程如下： 主用 OLT切换至备用 OLT时， 备用 OLT为部分或者全部 ONU分配上行带宽， 被分 配上行带宽的 ONU在为自身分配的上行带宽内发送上行数据； 其中， 备用 OLT和 / 或部分或者全部 ONU不改变 OLT切换之前的第一测距结果。 在本发明实施例中，主用 OLT切换至备用 OLT时，备用 OLT为部分或者全部 ONU 分配上行带宽， 被分配上行带宽的 ONU在为自身分配的上行带宽内发送上行数据； 其中， 备用 OLT和 /或部分或者全部 ONU不改变 OLT切换之前的第一测距结果。 即， 在本发明实施例中， 主用 OLT不能与 ONU通信后， 主备 OLT发生切换时， 备用 OLT 以及部分或全部 ONU不改变 OLT切换之前的第一测距结果， 并不需要对各个 ONU 重新进行测距， 而是继续使用主用 OLT 在主用通道分配的第一测距结果发送上行数 据， 使得备用 OLT进行正常工作所需时间被缩短， 保证承载业务的 QoS。 备用通道两侧分别涉及备用 OLT以及 ONU， 因此， 第一测距数据的应用主体可 以是备用 OLT， 也可以是 ONU， 根据主体不同进行具体说明。 以 ONU为主体进行说明， 本发明实施例提供了一种数据发送方法， 其处理流程 如图 3所示， 包括步骤 S302至步骤 S304: 步骤 S302、 主用 OLT切换至备用 OLT时， 备用 OLT为部分或全部 ONU分配上 行带宽； 步骤 S304、被分配上行带宽的 ONU在为各自分配的上行带宽内按照主用 OLT在 主用通道分配的第一测距结果发送上行数据。 在本发明实施例中， 主用 OLT切换至备用 OLT时， 备用 OLT为部分或全部 ONU 分配上行带宽， 被分配上行带宽的 ONU在为各自分配的上行带宽内按照主用 OLT在 主用通道分配的第一测距结果发送上行数据。 δΡ， 在本发明实施例中， 主用 OLT不能 与 ONU通信后， 主备 OLT发生切换时， 备用 OLT并不需要对各个 ONU重新进行测 距， 而是直接为部分或全部 ONU分配上行带宽， ONU继续使用主用 OLT在主用通道 分配的第一测距结果发送上行数据， 使得备用 OLT进行正常工作所需时间被缩短， 保 证承载业务的 QoS。 基于同一发明构思， 与图 3所示方法相对应， 本发明实施例还提供了一种数据发 送方法， 以备用 OLT为主体进行说明， 其结构示意图如图 4所示， 包括步骤 S402至 步骤 S404: 步骤 S402、 主用 OLT切换至备用 OLT时， 备用 OLT按照主用 OLT在主用通道 对各 ONU的第一测距结果给部分或全部 ONU分配上行带宽； 步骤 S404、 被分配上行带宽的 ONU在为各自分配的上行带宽内发送上行数据。 在本发明实施例中， 主用 OLT切换至备用 OLT时， 备用 OLT按照主用 OLT在主 用通道对各 ONU的第一测距结果给部分或全部 ONU分配上行带宽，被分配上行带宽 的 ONU在为各自分配的上行带宽内发送上行数据。 δΡ，在本发明实施例中，主用 OLT 不能与 ONU通信后， 主备 OLT发生切换时， 备用 OLT并不需要对各个 ONU重新进 行测距， 而是直接利用主用 OLT在主用通道分配的第一测距结果为部分或全部 ONU 分配上行带宽， ONU在分配的上行带宽内发送上行数据， 使得备用 OLT进行正常工 作所需时间被缩短， 保证承载业务的 QoS。 在图 3及图 4中记载的上行数据的发送过程， 备用 OLT是使用主用 OLT在主用 通道上测得的第一测量结果进行的上行带宽分配或者 ONU是利用第一测量结果进行 的上行数据发送， 即， 其相关操作或应用均是依赖于第一测量结果， 也就是说依赖于 主用通道的数据。 主用通道及备用通道自身具备差异性， 例如， 主用通道和备用通道 的长度不同， 因此， 上行数据到达备用 OLT和主用 OLT的时间存在一定的差值。 为 获得 ONU发送的上行数据到达备用 OLT的准确时间值， 在上行数据发送过程中， 备 用 OLT获取各被分配上行带宽的 ONU在备用通道的第二测距结果；备用 OLT根据第 二测距结果继续与被分配上行带宽的 ONU间进行上行数据的发送和接收。 其中， 备用 OLT获取被分配的 ONU在备用通道的第二测距结果， 可以采用下列 任意一种实施方式： 第一种， 备用 OLT获取被分配上行带宽的 ONU在主用通道与备用通道间的测距 差值， 根据测距差值与第一测距结果获取第二测距结果； 第二种， 备用 OLT接收被分配上行带宽的 ONU传输的上行帧， 直接计算第二测 距结果。 具体的， 第一测距结果和第二测距结果的类型可以包括： 均衡时延值（EqD)、 环 路时延值 （RTD) 或者环路时间 （RTT)。 当然， 在实施时， 测距结果还可以采用其他 类型， 能够体现测距结果即可。 现以上述几种类型为例对测距差值的计算方法进行详 细说明。 实施例一 备用 OLT计算被分配上行带宽的 ONU发送的上行数据实际到达的时间值与备用 OLT希望被分配上行带宽的 ONU发送的上行数据的到达时间值的差值， 取该到达时 间值的差值为测距差值。 实施例二 备用 OLT测量被分配上行带宽的 ONU在备用通路的测距值， 计算被分配上行带 宽的 ONU在主用通路的测距值和备用通路的测距值的差值， 取该测距的差值为测距 差值。 测距差值确定后， 备用 OLT可以将测距差值发送给 ONU， ONU即可以根据测距 差值和第一测距结果确定第二测距结果， 进而根据第二测距结果在分配的上行带宽上 进行上行数据发送。或者，备用 OLT根据测距差值和第一测距结果确定第二测距结果， 根据第二测距结果为 ONU分配上行带宽。 或者， 备用 OLT 还可以将每个第二测距结果发送给与该第二测距结果对应的
ONU, 其中， 对应的 ONU根据该第二测距结果更新自身的测距值； 备用 OLT再次为 对应的 ONU分配上行带宽， 对应的 ONU采用更新后的测距值发送上行数据。 或者， 备用 OLT还可以不将第二测距结果告知 ONU， 而是自身根据第二测距结 果判断出上行数据的到达时间， 并根据该到达时间接收上行数据。 在一个优选的实施例中， 备用 OLT与被分配上行带宽的 ONU建立通信后， 备用
OLT通过下列任意之一的方法获取第二测距结果： 第一种， 备用 OLT对被分配上行带宽的 ONU重新测距， 获取第二测距结果； 第二种， 备用 OLT与被分配上行带宽的 ONU交互指定消息获取第二测距结果。 其中， 第二种方法中指定消息可以为多种， 优选的， 包括下列至少之一： PLOAM 消息、 OMCI消息以及 GEM帧。 实施时，在主用 OLT切换至备用 OLT之后或者之前，为了让备用 OLT能够与 ONU 间建立通信， 备用 OLT需要获取 ONU的标识信息， 其涉及的获取方式可以有多种， 优选的， 可以包括： 备用 OLT接收主用 OLT发送的标识信息； 或者， 备用 OLT监听 部分或全部 ONU发送的上行帧， 获取标识信息。 其中， 标识信息包括下列至少之一： ONU-ID, MAC地址、 序列号信息、 逻辑链路标识、 均衡时延值、 环路时延值、 环路 时间、 传输容器以及吉比特封装方法端口标识。 若采用备用 OLT监听部分或全部 ONU发送的上行帧的方法，备用 OLT可以监听 上行帧中的下述部分或者全部内容获得 ONU的标识信息： PLOAM消息、 OMCI消息 以及 GEM帧。 在本发明实施例中， 主用 OLT切换至备用 OLT之前， 为保证 ONU能够获知对应 备用通路的配置 Profile信息， 主用 OLT广播对应备用通道的 Profile信息， 将备用通 道的相关信息告知 ONU。 在实施过程中， 备用 OLT为部分或全部 ONU分配的上行带宽具备如下特性： 备 用 OLT为部分或全部 ONU分配的上行带宽之间的 guard time大于主用 OLT为部分或 全部 ONU分配的上行带宽之间的 guard time。 ONU在具备该特性的上行带宽中发送 上行数据， 避免上行帧同时达到备用 OLT， 进一步保证承载业务的 QoS。 在一个优选的实施例中， 备用 OLT为部分或全部 ONU分配上行带宽之后， 备用
OLT可以直接同步部分或全部 ONU发送的上行帧。 当然， 备用 OLT给部分或全部 ONU分配上行带宽之后， 部分或全部 ONU由于 切换 OLT及通信通道， 可能会出现退出注册状态， 即回复初始状态， 此时， 应将回到 初始状态的 ONU重新经过注册激活过程后进入工作状态。 为将本发明实施例提供的数据发送方法阐述地更清楚更明白， 现以几个具体实施 例对其进行说明。 实施例三 本实施例对数据发送方法进行详细说明。 步骤 A、 ONU-ID获得方法 主用 OLT将 ONU的下述部分或者全部信息发送给备用 OLT: ONU-ID, MAC地 址、 序列号信息、 逻辑链路标识、 均衡时延值、 环路时延值、 环路时间、 传输容器、 吉比特封装方法端口标识， 或者备用 OLT监听 ONU发送的上行帧， 获得上述部分或 者全部信息， 具体通过下述方式： 备用 OLT监听 ONU发送的 PLOAM消息、 OMCI 消息和 /或 GEM帧获得 ONU-ID、 测距结果。 备用 OLT监听 ONU发送的上行帧， 备 用 OLT监听 ONU发送给主要 OLT的上行帧， 备用 OLT通过该上行帧中的 PLOAM 消息、 OMCI消息和 /或 GEM帧获得下述部分或者全部信息： ONU-ID、 MAC地址、 序列号信息、 逻辑链路标识、 均衡时延值、 环路时延值、 环路时间、 传输容器、 吉比 特封装方法端口标识。 步骤 B、 重用 EqD: 主用 OLT不能与 ONU通信后， 备用 OLT给部分或者全部 ONU分配上行带宽， 备用 OLT给 ONU分配的上行带宽之间的保护时间（guard time)大于主用 OLT给 ONU 分配的上行带宽之间的保护时间。 上述 ONU在上述上行带宽内按照主用 OLT分配的 测距结果发送上行数据， 或者备用 OLT按照主用 OLT对 ONU的测距结果给 ONU分 配上行带宽， ONU在上述上行带宽内发送上行数据。 步骤 C、 主备通道 EqD差值或者 RTT、 EqD获得方法 备用 OLT同步上行帧， 即备用 OLT给 ONU分配上行带宽后， 备用 OLT开始同 步上行帧。备用 OLT根据 ONU发送的上行数据实际到达的时间和备用 OLT希望上述 ONU发送的上行数据的到达时间的差值获得步骤 B中的 ONU需要调整的测距差值， 或者，备用 OLT根据该 ONU在主用通路的 RTD值和备用 OLT测得该 ONU在备用通 路的 RTD值之差获得上述的 ONU需要调整的测距差值， 或者 OLT根据主用 OLT对 ONU的测距结果给 ONU分配带宽后，收到 ONU的上行帧时直接计算 ONU在备用通 道的测距值。 步骤 D、 备用 OLT计算测距结果发送给 ONU， ONU更新 EqD 备用 OLT计算上述 ONU测距值或者上述 ONU需要调整的测距差值后， 将上述 测距值或者上述 ONU需要调整的测距差值发送给对应的 ONU， ONU收到备用 OLT 发送的上述信息后， 更新自己的测距值， 并在再次收到备用 OLT分配的上行带宽后采 用新的测距值发送上行数据。 步骤 E、 备用 OLT与 ONU建立通信后， OLT可以通过下述方法之一获得 ONU 在备用通路的测距结果值： 方法一： OLT对 ONU重新测距， 获得 ONU的测距结果值； 方法二： OLT通过与 ONU交互 PLOAM消息、 OMCI消息或者 GEM帧获得 ONU 的测距结果值。 步骤 F、 主用 OLT不能与 ONU通信后， 备用 OLT给部分或者全部 ONU分配上 行带宽， 若其中部分或者全部 ONU回到初始状态， 则回到初始状态的 ONU重新经过 注册激活过程后进入工作状态。 本实施例中， 测距结果为均衡时延值、 环路时延值或者环路时间。 采用本发明实施例提供的方法， 当 ONU从一个 OLT转移到另一个 OLT处， 可以 快速恢复业务传输， 提高网络的服务质量。 实例四 （GPON机制） 如图 2所示， 在保护主干光纤方式的无源光网络的拓扑结构中， 第一个光线路终 端 OLT1通过分光器到达 ONU的通路为主用通路，第二个光线路终端 OLT2通过分光 器到达 ONU的通路为备用通路。 OLT1将其管理的 ONU的 ONU标识信息（ONU-ID) 发送给 OLT2 (在其他实施例中也可以采用主用 OLT将 ONU的下述部分或者全部信 息发送给备用 OLT: ONU-ID, 序列号信息、 均衡时延值、 环路时延值、 传输容器、 吉比特封装方法端口标识、 VLAN信息）， 或者 OLT2监听 ONU发送给 OLT1的上行 帧获得 ONU标识信息 （在其他实施例中也可以采用 OLT2监听 ONU发送给 OLT1的 上行帧， 获得下述部分或者全部信息： ONU-ID、 序列号信息、 均衡时延值、 环路时延 值、 传输容器、 吉比特封装方法端口标识。 OLT2监听 ONU发送给 OLT1的上行帧， OLT2通过该上行帧中的 PLOAM消息、 OMCI消息和 /或 GEM帧获得上述部分或者全 部信息）。 在主用通路道和备用通道对应不同的配置信息时， 主用 OLT广播对应主用 通路和备用通道的 Profile信息。 主用通路作为光网络单元和光线路终端的服务通路， 在主用通路发生中断或者主 用 OLT发生故障后， ONU进入到下行信号丢失状态（06状态），启用备用通路和 OLT2 管理所有的 ONU。备用 OLT发送下行帧， 部分或者所有 ONU完成下行帧同步后进入 工作状态 ( 05 );或者备用 OLT给部分或者所有 ONU发送直接的 POU-UP消息（directed POP-UP messages), 06状态的 ONU收到 POP-UP消息后进入 05状态， ONU和 OLT2 采用下述步骤完成 ONU的均衡时延 （EqD) 值的更新： 步骤 1 : OLT2给各个 ONU分配上行带宽， OLT2给 ONU分配的上行带宽之间的 保护时间 （guard time) 大于 OLT1给 ONU分配的上行带宽之间的保护时间， 上述上 行带宽对应的前导较长； 步骤 2: 各个 ONU在 OLT2给自己分配的上行带宽内， 以对应 OLT1的均衡时延 EqDl向 OLT2发送上行数据。 步骤 3 : OLT2开始同步 ONU发送的上行帧， 在 OLT成功同步一个 ONU发送的 上行帧后， OLT通过下述两种方式之一计算 ONU需要调整的均衡时延调整值 AEqD: 方式一： AEqD=ONU上行帧的实际到达时间一 ONU上行帧的期望到达时间； 方式二： OLT计算 ONU在备用通路的 RTD值 RTD2, 并计算 AEqD=RTDl-RTD2 (RTD1的值为 OLT1发送给 OLT2或者 OLT2监听 ONU发送给 OLT1的上行帧获得 该内容）， 其中， RTD1为该 ONU在主用通路的 RTD值， RTD2为该 ONU在备用通 路的 RTD值。
OLT2将均衡时延调整值 AEqD发送给所有的 ONU; 步骤 4: 各个 ONU收到 OLT2发送的 AEqD值后， 更新自己的 EqD的值， 即更新 为与 OLT2对应的均衡时延值 EqD2:
EqD2= EqDl —AEqD 。 步骤 5 : OLT2给更新均衡时延的 ONU分配上行带宽， 且 OLT2给两个均完成更 新均衡时延的 ONU分配的上行带宽之间的保护时间 （guard time)等于 OLTl给 ONU 分配的上行带宽之间的保护时间； ONU收到 OLT2分配的上行带宽， 按照更新后的均 衡时延 EqD2发送上行数据以实现上行数据同步。 在本实施例中， 在步骤 5之后， 根据需要 OLT可以通过下述方法之一获得 ONU 在备用通路的 EqD值： 方法一： OLT对 ONU重新测距， 获得 ONU的测距结果值； 方法二： OLT通过与 ONU交互 PLOAM消息、 OMCI消息或者 GEM帧获得 ONU 的测距结果值。
OLT获得 ONU的 EqD值之后， 可以根据需要选择将上述 EqD值发送给相应的
在本实施例中， 在步骤 1 中， 若其中部分或者全部 ONU回到初始状态， 则所述 回到初始状态的 ONU重新经过注册激活过程后进入工作状态。 在本实施例中， OLT2将 ONU需要调整的 EqD的差值发送给 ONU， 在其他的实 施例中， 也可以采用下述方法： OLT1将所有 ONU的 EqDl发送给 OLT2， OLT2按照 上述方法计算出 AEqD,进而计算出 EqD2= EqDl 一 AEqD, OLT2将每个 ONU的 EqD2 发送给所有 ONU。 在本实施例中， OLT2将 ONU需要调整的 EqD的差值发送给 ONU， 在其他的实 施例中， 也可以只采用下述步骤恢复 ONU的通信： 步骤 1 : OLT2给各个 ONU分配上行带宽，且 OLT2给 ONU分配的上行带宽之间 的保护时间 （guard time) 大于 OLTl给 ONU分配的上行带宽之间的保护时间， 上述 上行带宽对应的前导较长； 步骤 2: 各个 ONU在 OLT2给自己分配的上行带宽内， 以对应 OLT1的均衡时延 EqDl向 OLT2发送上行数据。 步骤 3 : OLT2开始同步 ONU发送的上行帧。 在上述步骤 3中， 也可以采用下述方法： OLT2开始同步 ONU发送的上行帧， 具 体为 OLT2的光模块检测到上行光信号后， 立即发出复位信号同步上行数据。 在保护倒换发生后 ONU继续使用 OLT1分配的 EqD，不需要调整 EqD的值， OLT2 在步骤 3中同步到 ONU发送的上行帧后， OLT2获得 ONU发送上行帧的实际到达时 间， OLT2根据上述信息可以估计接下来所有 ONU的上行数据的实际到达时间值， 并 根据该时间接收上行数据。 在本实施例中， 保护倒换发生后， OLT2直接给 ONU分配上行带宽， 在其他的实 施例中， 也可以采用 OLT2首先给 ONU发送上行开销 （upstream_overhead) 消息， 上 述 upstream_overhead 消息中的前导字节数更长， ONU 接收并存储上述 upstream_overhead消息，然后 OLT给 ONU分配上行带宽， ONU在分配给自己的上行 带宽内发送的上行突发中的前导为上述 upstream—overhead消息中携带的前导值。 在本实施例中， 保护倒换发生后， OLT2同步 ONU发送的上行帧， 在其他的实施 例中也可以采用在保护倒换发生前， OLT1和 OLT2完成 ONU在备用通路的测距， OLT2 保存 ONU在备用通路的测距结果。保护倒换发生后， OLT2给 ONU分配上行带宽后， OLT2可以按照现有技术直接接收上行帧。 实例五 （EPON机制） 如图 2所示， 在保护主干光纤方式的无源光网络的拓扑结构中， 第一个光线路终 端 OLT1通过分光器到达 ONU的通路为主用通路，第二个光线路终端 OLT2通过分光 器到达 ONU的通路为备用通路。
OLT1将其管理的 ONU的 ONU逻辑链路标识 （LLID) 发送给 OLT2 (在其他实 施例中也可以采用 OLT1将 ONU的下述部分或者全部信息发送给 OLT2: LLID、 MAC 地址、 环路时间值、 VLAN信息）， 或者 OLT2监听 ONU发送给 OLT1的上行帧获得 ONU的 LLID (在其他实施例中也可以采用 OLT2监听 ONU发送给 OLT1的上行帧， 获得下述部分或者全部信息： LLID、 MAC地址、 环路时间值、 VLAN信息。 OLT2监 听 ONU发送给 OLT1的上行帧， OLT2通过该上行帧中的 eOAM消息、 OMCI消息 或者上行帧的其他部分内容等获得上述部分或者全部信息）。 主用通路作为光网络单元和光线路终端的服务通路， 在主用通路发生中断或者主 用 OLT发生故障后，启用备用通路和 OLT2管理所有的 ONU。OLTl在 OLT2管理 ONU 之前， 将所有 ONU在主用通路的测距结果环路时间值 RTT1发送给 OLT2， OLT2存 储上述信息。
ONU和 OLT2采用下述步骤建立通信： 步骤 1 : OLT2按照各个 ONU的 RTT1给各个 ONU分配上行带宽， 且 OLT2给 ONU分配的上行带宽之间的保护时间 （guard time)大于 OLTl给 ONU分配的上行带 宽之间的保护时间； 步骤 2: 各个 ONU在 OLT2给自己分配的上行带宽内发送上行数据。 步骤 3 : OLT2开始同步 ONU发送的上行帧， 在 OLT成功同步一个 ONU发送的 上行帧后， OLT通过下述两种方式之一计算 ONU在备用通路的 RTT: 方式一： ΔΚΓΤ=ΟΝυ上行帧的实际到达时间一 ONU上行帧的期望到达时间， OLT2 计算 ONU在备用通道的 RTT2值为 RTT2= RTT 1 一 ARTT； 方式二： OLT计算 ONU在备用通路的 RTT值。
OLT2按照各个 ONU的 RTT2给各个 ONU分配上行带宽。 在本实施例中， 在步骤 3之后， 根据需要 OLT可以对 ONU重新测距， 获得 ONU 的测距结果值 RTT， 并根据上述 RTT值给 ONU分配上行带宽。 在本实施例中， 在步骤 1 中， 若其中部分或者全部 ONU回到初始状态， 则所述 回到初始状态的 ONU重新经过注册激活过程后进入工作状态。 在本实施例中， OLT2计算 ONU在备用通道的 RTT2值， 在其他的实施例中， 也 可以只采用下述步骤恢复 ONU的通信： ONU和 OLT2采用下述步骤建立通信： 步骤 1 : OLT2按照各个 ONU的 RTT1给各个 ONU分配上行带宽， 且 OLT2给 ONU分配的上行带宽之间的保护时间 （guard time)大于 OLTl给 ONU分配的上行带 宽之间的保护时间； 步骤 2: 各个 ONU在 OLT2给自己分配的上行带宽内发送上行数据。 步骤 3 : OLT2开始同步 ONU发送的上行帧。 基于同一发明构思， 本发明实施例还提供了一种数据传输系统， 其结构示意图如 图 5所示， 包括备用 0LT 501和 ONU 502： 备用 OLT 501，设置为主用 OLT切换至备用 OLT 501时，为部分或者全部 ONU 502 分配上行带宽； 被分配上行带宽的 ONU 502， 与备用 OLT 501耦合， 设置为在为自身分配的上行 带宽内发送上行数据， 其中， 备用 OLT 501和 /或部分或者全部 ONU 502不改变 OLT 切换之前的第一测距结果。 在一个优选的实施例中， 备用 OLT 501， 还可以设置为在主用 OLT切换至备用 OLT 501时， 为部分或全部 ONU 502分配上行带宽； 被分配上行带宽的 ONU 502， 与备用 OLT 501耦合， 还可以设置为在为各自分配 的上行带宽内按照主用 OLT在主用通道分配的第一测距结果发送上行数据； 或者 备用 OLT 501， 还可以设置为在主用 OLT切换至备用 OLT 502时， 按照主用 OLT 在主用通道对各 ONU的第一测距结果给部分或全部 ONU 502分配上行带宽； 被分配上行带宽的 ONU 502， 与备用 OLT 501耦合， 还可以设置为在为各自分配 的上行带宽内发送上行数据。 从以上的描述中， 可以看出， 本发明实现了如下技术效果： 在本发明实施例中， 主用 OLT切换至备用 OLT时， 备用 OLT为部分或全部 ONU 分配上行带宽， 被分配上行带宽的 ONU在为各自分配的上行带宽内按照主用 OLT在 主用通道分配的第一测距结果发送上行数据。 即， 在本发明实施例中， 主用 OLT不能 与 ONU通信后， 主备 OLT发生切换时， 备用 OLT并不需要对各个 ONU重新进行测 距， 而是直接为部分或全部 ONU分配上行带宽， ONU继续使用主用 OLT在主用通道 分配的第一测距结果发送上行数据， 使得备用 OLT进行正常工作所需时间被缩短， 保 证承载业务的 QoS。 在本发明实施例中，主用 OLT切换至备用 OLT时，备用 OLT为部分或者全部 ONU 分配上行带宽， 被分配上行带宽的 ONU在为自身分配的上行带宽内发送上行数据； 其中， 备用 OLT和 /或部分或者全部 ONU不改变 OLT切换之前的第一测距结果。 即， 在本发明实施例中， 主用 OLT不能与 ONU通信后， 主备 OLT发生切换时， 备用 OLT 以及部分或全部 ONU不改变 OLT切换之前的第一测距结果， 并不需要对各个 ONU 重新进行测距， 而是继续使用主用 OLT 在主用通道分配的第一测距结果发送上行数 据， 使得备用 OLT进行正常工作所需时间被缩短， 保证承载业务的 QoS。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布在多个计算装置所 组成的网络上， 可选地， 它们可以用计算装置可执行的程序代码来实现， 从而， 可以 将它们存储在存储装置中由计算装置来执行， 并且在某些情况下， 可以以不同于此处 的顺序执行所示出或描述的步骤， 或者将它们分别制作成各个集成电路模块， 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样， 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领域的技 术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内， 所作的 任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种数据发送方法， 包括：
主用 0LT切换至备用 OLT时， 所述备用 OLT为部分或者全部 ONU分配 上行带宽， 被分配上行带宽的 ONU在为自身分配的上行带宽内发送上行数据； 其中， 所述备用 OLT和 /或所述部分或者全部 ONU不改变 OLT切换之前 的第一测距结果。
2. 根据权利要求 1所述的方法， 其中， 所述备用 OLT为部分或者全部 ONU分配 上行带宽， 被分配上行带宽的 ONU在为自身分配的上行带宽内发送上行数据， 包括：
主用 OLT切换至备用 OLT时， 所述备用 OLT为所述部分或全部 ONU分 配上行带宽；
被分配上行带宽的 ONU在为各自分配的上行带宽内按照所述主用 OLT在 主用通道分配的第一测距结果发送上行数据； 或者，
所述主用 OLT切换至所述备用 OLT时， 所述备用 OLT按照所述主用 OLT 在所述主用通道对各 ONU的第一测距结果给所述部分或全部 ONU分配上行带 宽；
被分配上行带宽的 ONU在为各自分配的上行带宽内发送所述上行数据。
3. 根据权利要求 2所述的方法， 其中， 所述上行数据的发送过程还包括：
所述备用 OLT 获取各被分配上行带宽的 ONU在备用通道的第二测距结 果；
所述备用 OLT根据所述第二测距结果继续与所述被分配上行带宽的 ONU 间进行所述上行数据的发送。
4. 根据权利要求 3所述的方法， 其中， 所述备用 OLT获取所述被分配上行带宽的 ONU在备用通道的第二测距结果， 包括：
所述备用 OLT获取所述被分配上行带宽的 ONU在所述主用通道与所述备 用通道间的测距差值， 根据所述测距差值与所述第一测距结果获取所述第二测 距结果； 或者 所述备用 OLT接收所述被分配上行带宽的 ONU传输的上行帧， 直接计算 所述第二测距结果。
5. 根据权利要求 4所述的方法， 其中， 所述第一测距结果和所述第二测距结果的 类型包括： 均衡时延值 EqD、 环路时延值 RTD或者环路时间 RTT。
6. 根据权利要求 4所述的方法， 其中， 所述备用 OLT获取所述被分配上行带宽的 ONU在所述主用通道与所述备用通道间的测距差值， 包括：
所述备用 OLT计算所述被分配上行带宽的 ONU发送的上行数据实际到达 的时间值与所述备用 OLT希望所述被分配上行带宽的 ONU发送的上行数据的 到达时间值的差值， 取该到达时间值的差值为所述测距差值； 或者，
所述备用 OLT 测量所述被分配上行带宽的 ONU在所述备用通路的测距 值， 计算所述被分配上行带宽的 ONU在所述主用通路的测距值和所述备用通 路的测距值的差值， 取该测距值的差值为所述测距差值。
7. 根据权利要求 4至 6任一项所述的方法， 其中， 所述备用 OLT根据所述第二测 距结果继续与所述被分配上行带宽的 ONU间进行所述上行数据的发送与接收， 包括：
所述备用 OLT将每个第二测距结果发送给与该第二测距结果对应的 ONU， 其中， 所述对应的 ONU根据该第二测距结果更新自身的测距值；
所述备用 OLT再次为所述对应的 ONU分配上行带宽， 所述对应的 ONU 采用更新后的测距值发送所述上行数据； 或者
所述备用 OLT根据所述第二测距结果判断所述上行数据的到达时间，并根 据所述到达时间接收所述上行数据。
8. 根据权利要求 3至 6任一项所述的方法， 其中， 所述备用 OLT与所述被分配上 行带宽的 ONU建立通信后， 所述备用 OLT通过下列任意之一的方法获取所述 第二测距结果：
所述备用 OLT对所述被分配上行带宽的 ONU重新测距， 获取所述第二测 距结果；
所述备用 OLT与所述被分配上行带宽的 ONU交互指定消息获取所述第二 测距结果。
9. 根据权利要求 8所述的方法， 其中， 所述指定消息包括下列至少之一： 物理层 操作管理维护 PLOAM消息、 ONU管理控制接口 OMCI消息以及吉比特封装方 法 GEM帧。
10. 根据权利要求 1至 9任一项所述的方法，其中，所述主用 OLT切换至备用 OLT 之后或者之前， 还包括： 所述备用 OLT按如下方式获取所述部分或全部 ONU 的标识信息：
所述备用 OLT接收所述主用 OLT发送的所述标识信息； 或者 所述备用 OLT监听所述部分或全部 ONU发送的上行帧， 获取所述标识信 息。
11. 根据权利要求 10所述的方法， 其中， 所述标识信息包括下列至少之一：
ONU-ID, MAC地址、 序列号信息、 逻辑链路标识、 均衡时延值、 环路时 延值、 环路时间、 传输容器以及吉比特封装方法端口标识。
12. 根据权利要求 1所述的方法， 其中， 所述主用 OLT切换至备用 OLT之前， 还 包括： 所述主用 OLT广播对应备用通道的配置 Profile信息。
13. 根据权利要求 1至 6任一项所述的方法， 其中， 所述备用 OLT为部分或全部 ONU分配的上行带宽包括：
所述备用 OLT 为所述部分或全部 ONU分配的上行带宽之间的保护时间 guard time大于所述主用 OLT为所述部分或全部 ONU分配的上行带宽之间的 guard time。
14. 根据权利要求 1所述的方法， 其中， 所述备用 OLT为部分或全部 ONU分配上 行带宽之后，还包括：所述备用 OLT同步所述部分或全部 ONU发送的上行帧。
15. 根据权利要求 1至 6任一项所述的方法， 其中， 所述备用 OLT给部分或全部 ONU分配上行带宽之后， 还包括：
若所述被分配上行带宽的 ONU中部分或全部 ONU回到初始状态，则回到 初始状态的 ONU重新经过注册激活过程后进入工作状态。
16. 一种数据传输系统， 包括备用 OLT和 ONU:
所述备用 OLT，设置为主用 OLT切换至备用 OLT时，为部分或者全部 ONU 分配上行带宽； 所述被分配上行带宽的 ONU，设置为在为自身分配的上行带宽内发送上行 数据， 其中， 所述备用 OLT和 /或所述部分或者全部 ONU不改变 OLT切换之 前的第一测距结果。
17. 根据权利要求 16所述的系统， 其中，
所述备用 OLT， 还设置为在主用 OLT切换至所述备用 OLT时， 为部分或 全部 ONU分配上行带宽；
被分配上行带宽的 ONU，还设置为在为各自分配的上行带宽内按照所述主 用 OLT在主用通道分配的第一测距结果发送上行数据； 或者
所述备用 OLT， 还设置为在所述主用 OLT切换至所述备用 OLT时， 按照 所述主用 OLT 在所述主用通道对各 ONU 的第一测距结果给所述部分或全部 ONU分配上行带宽；
被分配上行带宽的 ONU，还设置为在为各自分配的上行带宽内发送所述上 行数据。
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109451792A (zh) * 2017-08-11 2019-03-08 北京小米移动软件有限公司 调整信息传输的方法、基站及用户设备
CN109691200A (zh) * 2017-09-14 2019-04-26 Oppo广东移动通信有限公司 带宽部分bwp的激活方法及相关产品
CN112350778A (zh) * 2019-08-09 2021-02-09 瑞昱半导体股份有限公司 光网络单元与传送动态带宽报告上行信息的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105357140A (zh) * 2014-08-18 2016-02-24 中兴通讯股份有限公司 路由负荷分担方法和装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1866804A (zh) * 2005-10-19 2006-11-22 华为技术有限公司 对无源光网络的主干光纤进行故障保护倒换的方法
CN101677415A (zh) * 2008-09-19 2010-03-24 华为技术有限公司 光网络系统数据链路切换方法、光网络单元及系统
CN101888268A (zh) * 2009-05-14 2010-11-17 中兴通讯股份有限公司 一种在以太无源光网络实现主干光纤保护的方法和装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101557539B (zh) * 2008-04-09 2012-11-21 华为技术有限公司 一种光网络发送数据的方法、系统和设备
US9319758B2 (en) * 2008-10-21 2016-04-19 Broadcom Corporation Method and system for protection switching in ethernet passive optical networks
CN101990132A (zh) * 2009-07-30 2011-03-23 中兴通讯股份有限公司 光线路终端快速更新光网络单元测距结果的方法及系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1866804A (zh) * 2005-10-19 2006-11-22 华为技术有限公司 对无源光网络的主干光纤进行故障保护倒换的方法
CN101677415A (zh) * 2008-09-19 2010-03-24 华为技术有限公司 光网络系统数据链路切换方法、光网络单元及系统
CN101888268A (zh) * 2009-05-14 2010-11-17 中兴通讯股份有限公司 一种在以太无源光网络实现主干光纤保护的方法和装置

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109451792A (zh) * 2017-08-11 2019-03-08 北京小米移动软件有限公司 调整信息传输的方法、基站及用户设备
CN109451792B (zh) * 2017-08-11 2021-02-09 北京小米移动软件有限公司 调整信息传输的方法、基站及用户设备
US11184829B2 (en) 2017-08-11 2021-11-23 Beijing Xiaomi Mobile Software Co., Ltd. Method for information transmission adjustment, base station, and user equipment
CN109691200A (zh) * 2017-09-14 2019-04-26 Oppo广东移动通信有限公司 带宽部分bwp的激活方法及相关产品
CN109691200B (zh) * 2017-09-14 2020-10-30 Oppo广东移动通信有限公司 带宽部分bwp的激活方法及相关产品
US10833946B2 (en) 2017-09-14 2020-11-10 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Activation method for bandwidth part and related products
US11539593B2 (en) 2017-09-14 2022-12-27 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Activation method for bandwidth part and related products
CN112350778A (zh) * 2019-08-09 2021-02-09 瑞昱半导体股份有限公司 光网络单元与传送动态带宽报告上行信息的方法
CN112350778B (zh) * 2019-08-09 2022-06-14 瑞昱半导体股份有限公司 光网络单元与传送动态带宽报告上行信息的方法

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