Communication method and device, and storage medium

Abstract

The present application provides a communication method and device, and a storage medium. The communication method comprises: before an optical line terminal allocates an optical network terminal device identifier, the optical line terminal sends an access capability to an optical network terminal device; and the optical network terminal device determines a transmission parameter on the basis of the access capability.

Description

Communication method, device and storage medium Technical Field

[0001] The present application relates to the field of communication technology, and in particular to communication methods, devices and storage media. Background Art

[0002] In the 50G Passive Optical Network (PON) space, two different sets of access device specifications for 50G uplink rates exist within the same Optical Distribution Network (ODN) level. This means that equipment manufacturers and operators must choose one or the other for production and deployment in the same ODN scenario. This undoubtedly increases design and manufacturing complexity for equipment manufacturers, deployment costs for operators, and may even lead to fragmentation in the PON market. Therefore, it is necessary to address the compatibility issues between the two different access device specifications.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide a communication method, device, and storage medium, which effectively solve the compatibility problem between two sets of different access device indicators in the related art.

[0005] The present application provides a communication method, which includes:

[0006] The optical central office device sends access capabilities to the optical network terminal device; the optical network terminal device determines transmission parameters according to the access capabilities.

[0007] The present application provides a communication method applied to an optical central office device, which includes:

[0008] The access capability is sent to the optical network terminal device, so that the optical network terminal device determines the transmission parameters according to the access capability.

[0009] An embodiment of the present application provides a communication method applied to an optical network terminal device, which includes:

[0010] Receive access capabilities sent by the optical central office device; and determine transmission parameters according to the access capabilities.

[0011] An embodiment of the present application provides a communication device, comprising: a memory, and one or more processors; the memory is configured to store one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the communication method described in any of the above embodiments.

[0012] An embodiment of the present application provides a storage medium storing a computer program. When the computer program is executed by a processor, the communication method described in any of the above embodiments is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic diagram of an implementation of two different PON transceiver specifications at the same ODN level provided by the related art;

[0014] FIG2 is a schematic diagram of a solution to the compatibility problem of two different PON transceiver specifications at the same ODN level provided by the related art;

[0015] FIG3 is a flow chart of a communication method provided in an embodiment of the present application;

[0016] FIG4 is a flow chart of another communication method provided in an embodiment of the present application;

[0017] FIG5 is a flow chart of another communication method provided in an embodiment of the present application;

[0018] FIG6 is a schematic diagram of the configuration of an OC body of a downlink physical synchronization block PSBd according to an embodiment of the present application;

[0019] FIG7 is a structural block diagram of a communication device provided in an embodiment of the present application;

[0020] FIG8 is a structural block diagram of another communication device provided in an embodiment of the present application;

[0021] FIG9 is a structural block diagram of another communication device provided in an embodiment of the present application;

[0022] FIG10 is a schematic structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present application in conjunction with the accompanying drawings. The following describes the present application in conjunction with the accompanying drawings. The examples are only used to explain the present application and are not used to limit the scope of the present application.

[0024] In a PON system, the optical line terminal (OLT) and optical network unit (ONU) are connected by an optical distribution network (ODN). The ODN loss between the ONU and OLT varies with the fiber distance, splitting ratio, and splitter cascade level between the ONU and OLT. Therefore, under the same ONU transmission specifications, ONUs deployed at different locations can significantly vary the received optical power at the OLT. This requires the OLT to provide a high dynamic range receiver to avoid receiver overload.

[0025] Figure 1 is a schematic diagram of the implementation of two different PON transceiver specifications at the same ODN level, as provided by related technologies. As shown in Figure 1, at the same ODN level, there are two different PON transceiver specifications. Specifically, an ONU with a high transmit power specification needs to access an OLT with a high receive power specification, while an ONU with a low transmit power specification needs to access an OLT with a low receive power specification.

[0026] Data sent from the OLT to the ONU is called downstream transmission, while data sent from the ONU to the OLT is called upstream transmission. To avoid the use of highly dynamic receivers, the Power Leveling function is standardized in related technologies. This function reduces the ONU's transmit optical power to prevent OLT receiver overload. The OLT transmits ONU transmit power control signals to the ONU via Change_Power_Level and Upstream_Overhead messages. In the upstream direction, the ONU reports the adjusted transmit optical power via Serial_Number_ONU.

[0027] Aside from the Power Leveling mechanism, ONUs have no other way to adjust their transmit power. Figure 2 is a schematic diagram of a solution to the compatibility issue of two different PON transceiver specifications at the same ODN level, provided by related technology. As shown in Figure 2, Power Leveling can only attenuate the transmitter's optical power in steps of 3dB. This method of adjusting power does not effectively resolve the compatibility issue of different transceiver specifications under the same ODN. For example, an ONU with a low transmit optical power standard cannot guarantee that it meets the OLT receiver sensitivity requirements of the high-power transceiver specification. Similarly, an ONU with a high transmit optical power standard cannot guarantee that it meets the OLT receiver sensitivity requirements of the high-power transceiver specification after being attenuated by 3dB through Power Leveling. In addition, when an ONU with a high transmit optical power standard is directly connected to a PON network with a low-power transceiver specification, it may also cause an OLT receiver overload.

[0028] Power leveling can partially resolve compatibility issues. That is, after a high-power ONU undergoes 3dB attenuation, a portion of the ONU's transmitted optical power can be received by an OLT with a low receiving power specification. This depends on the ONU's specific location in the ODN and the splitting ratio. Taking G.984.3 as an example, the Power leveling mechanism provides three types of ONU transmitted optical power: nominal optical power, nominal optical power -3dB, and nominal optical power -6dB. This, to a certain extent, can resolve the issue of high-transmitting power ONUs overloading the receiver of low-receiving power OLTs. The original purpose of the Power Levelling function was not to resolve the aforementioned compatibility issues, but to enable ONU energy conservation. Using the Power Levelling function to resolve the aforementioned compatibility issues still requires corresponding revisions and cannot fully resolve the issue.

[0029] Power Levelling includes two ONU transmit optical power adjustment methods:

[0030] The first method: Power adjustment and activation by ONU

[0031] The power adjustment activation in this type of mode is reflected in the ONU online activation process. The ONU online activation process is as follows:

[0032] The ONU passively receives the downstream data frames from the OLT and receives PSync for superframe synchronization. After completing superframe synchronization, the ONU waits for the Upstream_Overhead PLOAM message and, optionally, the Extended_Burst_Length PLOAM message. The ONU receives the operating parameters of the PON and configures them, such as the pre-assigned delay and the initial optical power level. The initial optical power level cannot be adjusted by the ONU itself and can only transmit upstream optical signals according to the size set by the OLT. Once the ONU receives the Serial number request periodically broadcast by the OLT, it sends Serial_Number_ONU to the OLT according to the initial operating parameters to indicate the online request. When the ONU turns on Power After the levelling function is enabled, it can adjust its transmit optical power through continuous cycles, and send a Serial_Number_ONU message to the OLT as a negative response to not receiving the Assign_ONU-ID message sent by the OLT. The Serial_Number_ONU message indicates the transmit optical power currently used. The ONU adjusts the power in a modulo 3 cycle (..0,1,2,0,1,2..). The whole cycle will continue until the ONU receives the disable ONU message or Assign_ONU-ID message sent by the OLT. After the OLT discovers the Serial_Number_ONU of the new ONU, it will directly send a message to the ONU to assign an ONU-ID through the Assign_ONU-ID. The OLT sends a direct Serial number through the bandwidth mapping table. The ONU sends a request to the newly connected ONU and accurately measures its feedback time. The ONU sends a feedback message to the OLT. After receiving the message, the OLT calculates the equivalent delay (EqD) for the ONU and notifies the ONU through a Ranging_Time message. The ONU adjusts the start time of its GTC frame based on the equivalent delay (EqD), completes the online plan, and enters normal operation.

[0033] After the ONU enters normal operation, the OLT monitors the phase and BER of the ONU's upstream transmission data, and may recalculate and update the EqD, or even dynamically adjust the ONU's optical transmit power.

[0034] The second method: The OLT performs power adjustment and activation.

[0035] The OLT dynamically adjusts the ONU's transmit optical power by sending Change_Power_Level PLOAM messages. Each trigger causes the ONU to switch from its current state to the initial activation state and reactivate online. The OLT activates ONU power adjustment only when the ONU is in the ranging or working state.

[0036] The power leveling function is inherited in the standard. When the ONU responds to the SN grant, the Attenuation and Power leveling capabilities in the Serial_Number_ONU message can both attenuate the ONU's transmit power by an integer multiple of 1 to 7 dB of 3.

[0037] The optical terminal device in the embodiment of the present application may include: the OLT in the PON system, or the master device (MFU) in the fiber to the room (FTTR); correspondingly, the optical network terminal device may include: the ONU in the PON system, or the slave device (SFU) in the FTTR.

[0038] In one embodiment, Figure 3 is a flow chart of a communication method provided by an embodiment of the present application. This embodiment is applicable to situations where multiple access device specifications are compatible. This embodiment can be executed by an optical central office device and an optical network terminal device. As shown in Figure 3, this embodiment includes: S310-S320.

[0039] S310. The optical central office device sends access capabilities to the optical network terminal device.

[0040] The access capability sent by the optical central office device refers to the access capability that can match the optical central office device. In an embodiment, before the optical central office device assigns the optical network terminal device identifier to the optical network terminal device, the optical central office device can send the access capability that matches itself to the optical network terminal device.

[0041] S320. The optical network terminal device determines transmission parameters according to access capability.

[0042] In the embodiment, the optical network terminal device dynamically adjusts its own transmission parameters according to the access capability of the optical central office device itself, so that its own transmission parameters can match the access capability of the optical central office device, thereby enabling the optical network terminal device to successfully communicate with the optical central office device.

[0043] In one embodiment, the transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

[0044] In one embodiment, the access capability includes at least one of the following: receiving capability of the optical central office device; transmitting capability of the optical network terminal device; optical distribution network (ODN) level; and forward error correction coding.

[0045] In one example, the optical central office device can explicitly send access capabilities to the optical network terminal device, that is, the optical central office device directly sends the receiving capabilities of the optical central office device and / or the transmitting capabilities of the optical network terminal device supported by the optical central office device to the optical network terminal device. In one example, the optical central office device can also implicitly send access capabilities to the optical network terminal device. For example, the optical central office device sends the ODN level to the optical network terminal device. The optical network terminal device can compare it with the physical layer specification and obtain the receiving capabilities of the optical central office device at the current ODN level and the transmitting capabilities of the optical network terminal device. In one example, the optical central office device can also send forward error correction coding to the optical network terminal device. The optical network terminal device can encode according to the default FEC codeword or other newly added FEC codeword so that its own transmitted optical power can meet the receiving capabilities matched by the optical central office device, or the transmitting capabilities of the optical network terminal device matched by the optical central office device. In one example, the transmitting capabilities of the optical network terminal device refer to the transmitting capabilities that match the receiver specifications of the optical central office device.

[0046] In one embodiment, the receiving capability of the optical central office device includes receiver sensitivity; the transmitting capability of the optical network terminal device includes average transmitted optical power; the optical distribution network (ODN) level includes at least one of the following: ODN levels corresponding to different optical link loss ranges, ODN levels corresponding to different receiver sensitivities within the same optical link loss range, and ODN levels corresponding to different average transmitted optical powers within the same optical link loss range; and the forward error correction (FEC) code includes at least two different FEC codes. In one example, the FEC codeword corresponding to each FEC code has a different coding gain.

[0047] In one embodiment, the receiver sensitivity includes at least one of the following: sensitivity at a given bit error rate (BER) and optical modulation amplitude (OMA) sensitivity at a given bit error rate (BER); and the average transmitted optical power includes at least one of the following: minimum average transmitted power, minimum optical modulation amplitude-transmitter and dispersion eye closure (OMA-TDEC) transmitted power, and minimum OMA transmitted power.

[0048] In one embodiment, the access capability is transmitted in at least one of the following ways: broadcasting the access capability; multicasting the access capability; and unicasting the access capability. In one example, the optical central office device may broadcast the access capability to the optical network terminal device, for example, periodically, intermittently, on-demand, once or multiple times, or with an adjustable broadcast frequency. In one example, the optical central office device may also transmit the access capability to the optical network terminal device in a multicast manner, for example, multicasting (also referred to as groupcasting) to a specific group of optical network terminal devices. In one example, the optical central office device may also transmit the access capability to the optical network terminal device in a unicast manner, thereby establishing a point-to-point network connection between the optical central office device and the optical network terminal device.

[0049] In one embodiment, the access capability includes any one of the following: a value indicating the access capability, an identifier indicating the access capability. In one example, the optical central office device may send a value representing the access capability to the optical network terminal device, or may send an identifier representing the access capability to the optical network terminal device.

[0050] In one embodiment, the transmission parameter includes: the transmission optical power of the optical network terminal device; the optical network terminal device determines the transmission parameter according to the access capability, including one of the following:

[0051] If the ONT device's transmission specification exceeds the access capability, the ONT device reduces its transmitted optical power to meet the access capability. If the ONT device's transmission specification falls below the access capability, the ONT device increases its transmitted optical power to meet the access capability. If the ONT device's transmission specification falls below the access capability, the ONT device transmits optical power according to its own transmission specification. In one example, the ONT device's transmission specification can be understood as the transmission specification configured at the factory, and the access capability can be understood as the access capability that matches the optical central office device.

[0052] In one embodiment, the transmission specification of the optical network terminal device includes: average transmission optical power; the average transmission optical power includes at least one of the following: minimum average transmission power, minimum OMA-TDEC transmission power, and minimum OMA transmission power.

[0053] In one embodiment, the transmission specification of the optical network terminal device being higher than the access capability includes at least one of the following:

[0054] The minimum average transmit power of the optical network terminal device is higher than the minimum average transmit power sent by the optical central office device; the minimum OMA-TDEC transmit power of the optical network terminal device is higher than the minimum OMA-TDEC transmit power sent by the optical central office device; the minimum OMA transmit power of the optical network terminal device is higher than the minimum OMA transmit power sent by the optical central office device; the minimum average transmit power of the optical network terminal device is higher than the sensitivity at a given bit error rate (BER) sent by the optical central office device and the sum of the optical link budget between the optical network terminal device and the optical central office device; the minimum OMA transmit power of the optical network terminal device is higher than the OMA sensitivity at a given bit error rate (BER) sent by the optical central office device and the sum of the optical link budget between the optical network terminal device and the optical central office device.

[0055] In one embodiment, the transmission specification of the optical network terminal device being lower than the access capability includes at least one of the following:

[0056] The minimum average transmit power of the optical network terminal device is lower than the minimum average transmit power sent by the optical central office device; the minimum OMA-TDEC transmit power of the optical network terminal device is lower than the minimum OMA-TDEC transmit power sent by the optical central office device; the minimum OMA transmit power of the optical network terminal device is lower than the minimum OMA transmit power sent by the optical central office device; the minimum average transmit power of the optical network terminal device is lower than the sensitivity at a given bit error rate (BER) sent by the optical central office device and the sum of the optical link budget between the optical network terminal device and the optical central office device; the minimum OMA transmit power of the optical network terminal device is lower than the OMA sensitivity at a given bit error rate (BER) sent by the optical central office device and the sum of the optical link budget between the optical network terminal device and the optical central office device.

[0057] In one embodiment, the optical link budget between the optical network terminal device and the optical central office device includes at least: an absolute value of a maximum optical link loss OPL corresponding to an optical distribution network ODN level.

[0058] In one embodiment, the transmission parameters include: the transmission optical power of the optical network terminal device; if the transmission specification of the optical network terminal device is higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power within its own transmission specification, the optical network terminal device determines the transmission parameters according to the access capability, including:

[0059] The optical network terminal device automatically performs an attenuation operation of the first preset power.

[0060] In one example, the first preset power may be a preconfigured transmit optical power value. If the transmit specification of the optical network terminal device exceeds the receive capability of the optical central office device, the optical network terminal device may automatically attenuate its transmit optical power by one or more of the first preset powers. For example, if the first preset power is 3 dB, the optical network terminal device may attenuate its transmit optical power by 1 to 7 integer multiples of 3 dB.

[0061] In one embodiment, the transmission parameters include: forward error correction coding of the optical network terminal device; if the transmission specification of the optical network terminal device is lower than the receiving capability of the optical central office device, the optical network terminal device determines the transmission parameters according to the access capability, including one of the following:

[0062] The optical network terminal device switches from the default FEC codeword to the first FEC codeword, wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword; the optical network terminal device uses the first high-gain FEC codeword, wherein the coding gain of the first high-gain FEC codeword is greater than the coding gain of other FEC codewords.

[0063] In one example, if the transmission specification of the optical network terminal device is lower than the receiving capability of the optical central office device, the optical network terminal device can switch from the currently used default FEC codeword to a first FEC codeword and use the first FEC codeword for forward error correction. If, after encoding using the first FEC codeword, the optical network terminal device still cannot reach the matching access capability of the optical central office device, it can continue to use a second FEC codeword with a slightly higher coding gain than the first FEC codeword and perform encoding again until the forward error correction coding of the optical network terminal device matches the forward error correction coding of the optical central office device. In another example, if the transmission specification of the optical network terminal device is lower than the receiving capability of the optical central office device, and the coding gain of the first high-gain FEC codeword is greater than the coding gain of all other FEC codewords, the optical network terminal device can directly use the first high-gain FEC codeword for forward error correction to meet the forward error correction coding requirements of the optical central office device.

[0064] In one embodiment, the transmission parameters include: the transmission optical power and forward error correction code of the optical network terminal device; if the transmission specification of the optical network terminal device is higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power within its own transmission specification, the optical network terminal device determines the transmission parameters according to the access capability, including:

[0065] The optical network terminal device automatically performs an attenuation operation of a first preset power; if the power of the optical signal sent by the optical network terminal device to the optical central office device does not meet the receiving capability of the optical central office device, the optical network terminal device switches from the default FEC codeword to the first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword.

[0066] In one example, when the transmission specification of an optical network terminal device exceeds the receiving capability of an optical central office device, the optical network terminal device may first attenuate the optical signal to a first preset power. If the power of the optical signal transmitted by the optical network terminal device to the optical central office device still cannot meet the receiving capability of the optical central office device, the optical network terminal device may switch from the default FEC codeword to the first FEC codeword to perform forward error correction on the optical signal transmitted by the optical network terminal device. Of course, if the optical network terminal device still cannot meet the receiving capability of the optical central office device after encoding using the first FEC codeword, the optical signal transmitted by the optical network terminal device may be further forward-error corrected using a second FEC codeword, a third FEC codeword, or an Nth FEC codeword until the receiving capability of the optical central office device is met. The coding gain of the second FEC codeword is greater than the coding gain of the first FEC codeword; the coding gain of the third FEC codeword is greater than the coding gain of the second FEC codeword; and the coding gain of the Nth FEC codeword is greater than the coding gain of the N-1th FEC codeword.

[0067] In one embodiment, the notification method for the first FEC codeword includes one of the following: specifying, in a bandwidth allocation mapping table, that the optical network terminal device adopt burst configuration information with a new index number; or specifying, via a first management message, that the optical network terminal device adopt a first FEC codeword with a higher coding gain than a default FEC codeword. In one example, the bandwidth allocation mapping table may also be referred to as Bwmap; and the first management message may be a PLOAM message.

[0068] In one embodiment, the communication method further includes: the optical central office device receiving, from the optical network terminal device, a transmit power adjustment capability, a transmit power adjustment status, and transmit indication information. In one example, the transmit power adjustment capability indicates whether the optical network terminal device supports transmit optical power adjustment; the transmit power adjustment status indicates whether the transmit optical power of the optical network terminal has been adjusted; and the transmit indication information indicates the transmit specifications of the optical network terminal device.

[0069] In one embodiment, the transmit power adjustment capability and transmit power adjustment status are carried in a serial number message. In one example, the serial number message may be a Serial Number ONU message.

[0070] In one embodiment, the communication method further includes: the optical central office device receiving a response message of the serial number authorization sent by the optical network terminal device within a pre-configured quiet window according to the transmission parameters.

[0071] In one embodiment, FIG4 is a flow chart of another communication method provided by an embodiment of the present application. This embodiment is applied to situations where multiple different access device indicators are compatible. This embodiment can be executed by an optical central office device. As shown in FIG4 , this embodiment includes: S410.

[0072] S410: Send access capabilities to the optical network terminal device, so that the optical network terminal device determines transmission parameters according to the access capabilities.

[0073] In one embodiment, the transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

[0074] In one embodiment, the access capability includes at least one of the following: receiving capability of the optical central office device; transmitting capability of the optical network terminal device; optical distribution network (ODN) level; and forward error correction coding.

[0075] In one embodiment, the receiving capability of the optical terminal device includes: receiver sensitivity; the transmitting capability of the optical network terminal device includes: average transmitted optical power; the optical distribution network ODN level includes at least one of the following: ODN levels corresponding to different optical link loss ranges, ODN levels corresponding to different receiver sensitivities in the same optical link loss range, and ODN levels corresponding to different average transmitted optical powers in the same optical link loss range; and the forward error correction coding includes: at least two different forward error correction codes.

[0076] In one embodiment, the receiver sensitivity includes at least one of the following: sensitivity at a given bit error rate (BER), and OMA sensitivity at a given bit error rate (BER); the average transmitted optical power includes at least one of the following: minimum average transmitted power, minimum OMA-TDEC transmitted power, and minimum OMA transmitted power.

[0077] In one embodiment, the access capability is sent in at least one of the following ways: broadcasting the access capability; multicasting the access capability; and unicasting the access capability.

[0078] In one embodiment, the access capability includes any one of the following: a value indicating the access capability, an identifier indicating the access capability.

[0079] In one embodiment, the transmission parameter includes: the transmission optical power of the optical network terminal device; the optical network terminal device determines the transmission parameter according to the access capability, including one of the following:

[0080] If the transmission specification of the optical network terminal device is higher than the access capability, the optical network terminal device reduces its transmitted optical power to meet the access capability; if the transmission specification of the optical network terminal device is lower than the access capability, the optical network terminal device increases its transmitted optical power to meet the access capability; if the transmission specification of the optical network terminal device is lower than the access capability, the optical network terminal device transmits optical power according to its own transmission specification.

[0081] In one embodiment, the transmission parameters include: the transmission optical power of the optical network terminal device; if the transmission specification of the optical network terminal device is higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power within its own transmission specification, the optical network terminal device determines the transmission parameters according to the access capability, including:

[0082] The optical network terminal device automatically performs an attenuation operation of the first preset power.

[0083] In one embodiment, the transmission parameters include: forward error correction coding of the optical network terminal device; if the transmission specification of the optical network terminal device is lower than the receiving capability of the optical central office device, the optical network terminal device determines the transmission parameters according to the access capability, including one of the following:

[0084] The optical network terminal device switches from the default FEC codeword to the first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword; the optical network terminal device uses the first high-gain FEC codeword, wherein the coding gain of the first high-gain FEC codeword is greater than the coding gain of other FEC codewords.

[0085] In one embodiment, the transmission parameters include: the transmission optical power and forward error correction code of the optical network terminal device; if the transmission specification of the optical network terminal device is higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power within its own transmission specification, the optical network terminal device determines the transmission parameters according to the access capability, including:

[0086] The optical network terminal device automatically performs an attenuation operation of a first preset power; if the power of the optical signal sent by the optical network terminal device to the optical central office device does not meet the receiving capability of the optical central office device, the optical network terminal device switches from the default FEC codeword to the first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword.

[0087] In one embodiment, the notification method of the first FEC codeword includes one of the following: specifying the burst configuration information of the new index number for the optical network terminal device in the bandwidth allocation mapping table; specifying the optical network terminal device to use the first FEC codeword with a higher coding gain than the default FEC codeword through a first management message.

[0088] In one embodiment, the communication method applied to the optical central office device further includes: receiving the transmission power adjustment capability, transmission power adjustment status and transmission instruction information reported by the optical network terminal device.

[0089] In one embodiment, the communication method applied to the optical central office device further includes: receiving a response message of a sequence number authorization sent by the optical network terminal device within a pre-configured quiet window according to the transmission parameters.

[0090] For explanations of parameters such as access capability, transmission parameters, ODN level, etc. involved in the communication method applied to optical terminal equipment, please refer to the description of corresponding parameters in the above-mentioned communication method applied to the interaction between optical terminal equipment and optical network terminal equipment, which will not be repeated here.

[0091] In one embodiment, FIG5 is a flowchart of another communication method provided by an embodiment of the present application. This embodiment is applied to situations where multiple different access device indicators are compatible. This embodiment can be executed by an optical network terminal device. As shown in FIG5, this embodiment includes: S510-S520.

[0092] S510: Receive access capability sent by the optical central office device.

[0093] S520: Determine transmission parameters according to access capability.

[0094] In one embodiment, the transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

[0095] In one embodiment, the access capability includes at least one of the following: receiving capability of the optical central office device; transmitting capability of the optical network terminal device; optical distribution network (ODN) level; and forward error correction coding.

[0096] In one embodiment, the receiving capability of the optical terminal device includes: receiver sensitivity; the transmitting capability of the optical network terminal device includes: average transmitted optical power; the optical distribution network ODN level includes at least one of the following: ODN levels corresponding to different optical link loss ranges, ODN levels corresponding to different receiver sensitivities in the same optical link loss range, and ODN levels corresponding to different average transmitted optical powers in the same optical link loss range; and the forward error correction coding includes: at least two different forward error correction codes.

[0097] In one embodiment, the receiver sensitivity includes at least one of the following: sensitivity at a given bit error rate (BER), and OMA sensitivity at a given bit error rate (BER); the average transmitted optical power includes at least one of the following: minimum average transmitted power, minimum OMA-TDEC transmitted power, and minimum OMA transmitted power.

[0098] In one embodiment, the access capability is sent in at least one of the following ways: broadcasting the access capability; multicasting the access capability; and unicasting the access capability.

[0099] In one embodiment, the access capability includes any one of the following: a value indicating the access capability, an identifier indicating the access capability.

[0100] In one embodiment, the transmission parameters include: the transmission optical power of the optical network terminal device; the transmission parameters are determined according to the access capability, including one of the following:

[0101] If the transmission specification of the optical network terminal device is higher than the access capability, the optical network terminal device reduces its transmitted optical power to meet the access capability; if the transmission specification of the optical network terminal device is lower than the access capability, the optical network terminal device increases its transmitted optical power to meet the access capability; if the transmission specification of the optical network terminal device is lower than the access capability, the optical network terminal device transmits optical power according to its own transmission specification.

[0102] In one embodiment, the transmission parameters include: the transmission optical power of the optical network terminal device; if the transmission specification of the optical network terminal device is higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power within its own transmission specification, the transmission parameters are determined according to the access capability, including:

[0103] The optical network terminal device automatically performs an attenuation operation of the first preset power.

[0104] In one embodiment, the transmission parameters include: forward error correction coding of the optical network terminal device; if the transmission specification of the optical network terminal device is lower than the receiving capability of the optical central office device, the transmission parameters are determined according to the access capability, including one of the following:

[0105] The optical network terminal device switches from the default FEC codeword to the first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword; the optical network terminal device uses the first high-gain FEC codeword, wherein the coding gain of the first high-gain FEC codeword is greater than the coding gain of other FEC codewords.

[0106] In one embodiment, the transmission parameters include: the transmission optical power and forward error correction code of the optical network terminal device; if the transmission specification of the optical network terminal device is higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power within its own transmission specification, the transmission parameters are determined according to the access capability, including:

[0107] The optical network terminal device automatically performs an attenuation operation of a first preset power; if the power of the optical signal sent by the optical network terminal device to the optical central office device does not meet the receiving capability of the optical central office device, the optical network terminal device switches from the default FEC codeword to the first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword.

[0108] In one embodiment, the notification method of the first FEC codeword includes one of the following: specifying the burst configuration information of the new index number for the optical network terminal device in the bandwidth allocation mapping table; specifying the optical network terminal device to use the first FEC codeword with a higher coding gain than the default FEC codeword through a first management message.

[0109] In one embodiment, the communication method applied to the optical network terminal device further includes: reporting the transmit power adjustment capability, transmit power adjustment status and transmit instruction information to the optical central office device.

[0110] In one embodiment, the communication method applied to the optical network terminal device further includes: sending a response message of serial number authorization to the optical central office device within a pre-configured quiet window according to the transmission parameters.

[0111] For explanations of parameters such as access capability, transmission parameters, ODN level, etc. involved in the communication method applied to optical network terminal equipment, please refer to the description of the corresponding parameters in the above-mentioned communication method applied to the interaction between optical central office equipment and optical network terminal equipment, which will not be repeated here.

[0112] In the following embodiments, the optical central office device is an OLT in a PON system, and the optical network terminal device is an ONU in a PON system as an example to illustrate the implementation process of determining transmission parameters based on access capabilities. Of course, the embodiments of the present application are also applicable to the MFU in FTTR and the SFU in FTTR.

[0113] FIG6 is a schematic diagram of the configuration of an OC body of a PSBd downlink physical synchronization block provided in an embodiment of the present application. As shown in FIG6 , a 3-bit ODN level is defined.

[0114] The operation control structure consists of a 51-bit operation control body (OC body) and a 13-bit HEC field, as shown in Figure 6. The HEC field consists of the BCH (63, 12, 2) code of the first 63 bits of the operation control structure and one parity bit.

[0115] The Operation Control Body has a specific format as described below and is filled in by the OLT CT based on explicitly specified data.

[0116] As shown in Figure 6, when the downlink line rate is 49.7664 Gbit / s, the specific values ​​of the operation control entity are defined as follows:

[0117] a) PON-ID Type (PIT) (8 bits, static, operator assigned): Indication of the ODN architecture, the source of the reported transmit power, and the ODN category. The PIT field is further divided as follows:

[0118] RE Flag (1 bit): Indicates whether the Transmitted Light Level (TOL) field contains the transmit power of the OLT CT (RE = 0) or the transmit power of the extender (RE = 1). ODN Class (3 bits): Identifies the transceiver optical interface parameters according to the ODN Optical Path Loss (OPL) class defined in the applicable PMD layer standard. The ODN class encoding definition for 50G-PON is shown in Table 4.

[0119] Downstream FEC Flag (1 bit): Indicates whether FEC is enabled in the downstream direction. When this bit is set to 1, FEC in the downstream direction is enabled. A value of 0 is reserved. P Flag (1 bit): Protocol indicator for the TC layer protocol. When this bit is set to 1, the TC layer protocol is used. A value of 0 is reserved. Link Type (2 bits): The optical link type described in the applicable PMD standard.

[0120] b) PON-ID (32 bits, static, operator-assigned): identifies the OLT within a domain. The PON-ID consists of the following two fields:

[0121] Management Tag (28 bits): Provided to the OLT CT by the EMS / OSS according to a specific physical or logical numbering plan. The Management Tag is processed transparently by the OLT CT.

[0122] DWLCH ID (4 bits): The index of a wavelength channel within the ordered set of downstream wavelength channels available in a given PON system. In a TDM system, the value of DWLCH ID is 0xF.

[0123] c) R (1 bit): Reserved for future use, set to 0.

[0124] d) C (1 bit): Transmitted optical level reference point indicator. When C = 0, the following TOL value refers to the S / R-CG reference point (in the case of a TDM system). When C = 1, the following TOL value refers to the S / R-CP reference point.

[0125] TOL (9 bits, dynamic, maintained by the system): Transmitted Optical Level. If RE = 0, TOL indicates the current transmit power sent by the OLT CT transceiver to the ODN (at the reference point indicated by the C bit). If RE = 1, TOL indicates the transmit power reaching the extender transceiver. Its value is an integer representing a logarithmic power metric with 0.1 dB granularity relative to -30 dBm (i.e., a value of 0 represents -30 dBm, 0x12C represents 0 dBm, and 0x1FE represents 21 dBm). The default value of 0x1FF indicates that TOL is not supported on the given PON interface.

[0126] Table 1 shows a schematic diagram of the ODN optical path loss classification coding provided by the ITU-T G.9804 standard. As shown in Table 1, the code values ​​represented by these three bits can distinguish the ODN levels corresponding to N1, N2, E1, E2, and C+, that is, the optical path loss range corresponding to the ODN.

[0127] Table 1 ODN optical path loss (OPL) classification and coding

[0128] In Table 1 above, each ODN level corresponds to a specific optical path loss range with a specific physical layer specification (PMD table), which defines the ONU transmitter and OLT receiver specifications. However, for the same ODN loss level, two different sets of ONU transmitter and OLT receiver specifications are defined for ODN levels N1 and C+, respectively. The code value 000 corresponds to two different ONU transmitter and OLT receiver specifications, N1 and N1b; the code value 100 also corresponds to two different ONU transmitter and OLT receiver specifications, C+ and C+b. Continuing to use these three bits in the OC body in the standard, ODN OPL levels N1 and C+ no longer distinguish which set of transceiver specifications applies.

[0129] Therefore, one feasible approach is to continue increasing the value of the Code value shown in Table 1, and to indicate different transceiver specifications at the same ODN level using two different code values; for example, in an embodiment of the present application, it can be provided that: 101 represents N1b, and 110 represents C+b. Alternatively, instead of increasing the above code value, the reserved bits of the System_Profile PLOAM message can be redefined to distinguish different OLT receiver specifications or PON upstream transceiver specifications (OLT receiver specifications + ONU transmitter specifications) at the same ODN level. Table 2 is a configuration diagram of a System_Profile message format provided in an embodiment of the present application. As shown in Table 2, the system configuration version is configured in the 8th byte to indicate the use of different access specifications.

[0130] Table 2 System_Profile message format

[0131] The ONU connected to the PON system will obtain the ONU upstream Burst_Profile information through continuous configuration learning. Based on its own transceiver specifications and transmit power variable capability, the ONU responds to the SN grant through Serial_Number_ONU and provides an indication of the ONU transmit power variable capability.

[0132] As shown in Table 3, for example, the Serial_Number_ONU message includes an indication of the ONU's transmit power capability and adjustment status (byte 38), and optionally an indication that the ONU's transmit index does not match the current OLT's receive index (byte 40):

[0133] Table 3 Serial_number_ONU message format

[0134] When an ONU of the same ODN level accesses a PON system and responds to an SN grant, it must initially adjust its uplink transmit power based on its own transmit power variability. The adjustment method is as follows (regardless of whether the ONU's uplink transmit power is adjusted, the default uplink FEC pattern is used at this stage):

[0135] (1) The minimum average transmit power index of the access ONU does not meet the ONU upstream transmission specification indicated by the OLT downstream direction. Possible adjustment methods are as follows:

[0136] 1) The ONU's transmission specification exceeds the ONU's transmission capability indicated by the OLT, but the ONU's transmitter has power adjustment capability. In this case, the upstream signal transmitted by the ONU may overload the OLT's receiver. Therefore, the ONU needs to reduce its transmission power to meet the OLT's reception specification. After power adjustment, the first four bits of the 38th byte of Serial_Number_ONU will be AA = 10 and BB = 01.

[0137] The meaning of AABB is as follows:

[0138] AA indicates the ability to adjust the transmit power of the ONU transmitter, where: AA = 00 indicates that the current ONU's transmit baseline cannot be adjusted; AA = 01 indicates that the current ONU's transmit baseline can be increased to meet a higher transmit power indicator for the same ODN level; AA = 10 indicates that the current ONU's transmit baseline can be reduced to meet a lower transmit power indicator for the same ODN level; BB indicates the adjustment result of the ONU's own ONU transmit power in the SN grant response phase; where: BB = 00: the transmit baseline is not adjusted; BB = 01: the current ONU's transmit baseline has been reduced; BB = 10: the current ONU's transmit baseline has been increased.

[0139] 2) The ONU's transmission specification is lower than the ONU's transmission capability indicated by the OLT. In this case, the upstream signal transmitted by the ONU may not be correctly received by the OLT. Therefore, the ONU may need to increase its transmission power to meet the OLT's reception specification. The meaning of AABB is the same as in 1). After power adjustment, the first four bits of the 38th byte of Serial_Number_ONU are AA=01 and BB=10.

[0140] 3) The ONU's transmission specifications do not match the ONU's transmission capabilities indicated by the OLT, and the ONU cannot adjust its transmit optical power to meet the OLT's transmission capabilities. Even in this case, the optical signal transmitted by the ONU according to its own transmission specifications may still meet the dynamic range requirements of the OLT receiver at the OLT. Therefore, although the transmission specifications may not be met, the OLT can still normally receive upstream ONU data on the receiving side. In this case, the first four bits of the 38th byte corresponding to Serial_Number_ONU are AA = 00, BB = 00.

[0141] 4) The ONU's transmission specification does not match the ONU's transmission capability indicated by the OLT, and the ONU cannot adjust its transmitted optical power to meet the ONU's transmission capability indicated by the OLT. If the ONU continues to transmit optical signals according to its own transmission specification, the optical power received at the OLT may cause the OLT receiver to overload or be unable to receive correctly. This situation is the same as 3) corresponding to the first 4 bits of the 38th byte of Serial_Number_ONU: AA=00, BB=00.

[0142] (2) The minimum average transmit power index of the access ONU is consistent with the ONU upstream transmission specification indicated by the OLT downstream direction, and the ONU transmits at normal transmit power; this situation corresponds to the first four bits AA=00, BB=00 of the 38th byte of Serial_Number_ONU.

[0143] The OLT further configures the upstream transmission parameters of the ONU.

[0144] After the ONU completes its response to the SN grant, the OLT receives the Serial_Number_ONU message uploaded by the ONU, regardless of whether the ONU is adjusted.

[0145] In most cases, the OLT can detect the ONU's online request and learn about the current status of the connected ONU by analyzing the optical power adjustment capability reported by the ONU. It can then perform subsequent configurations. For example, by analyzing whether the DDDD value in the Activation Debug information of the 40th byte of Serial_Number_ONU is 1110, the OLT can know whether the transmission specification of the online ONU is consistent with the current PON system. And by analyzing the first 4 bits of the 38th byte, the OLT can know whether the optical power of the online ONU supports adjustment and whether it has been adjusted. After the OLT finds that the ONU responds normally, the subsequent activation and registration process is the same as G.9804.2.

[0146] However, there is a special case where the ONU can only transmit optical power within its own transmission specifications. The OLT will either receive an optical signal with an overloaded power leveling system that requires 3dB attenuation before transmission, or the OLT's BER will not meet the required signal reception. In either case, the OLT will reissue an SN grant to the ONU that cannot receive the signal normally and specify a new ONU uplink burst profile template index in the Burst_Profile index corresponding to the BWmap. After configuring the new uplink burst profile, the ONU will resend the Serial_Number_ONU message to the OLT. The uplink burst profile corresponding to the new Burst_Profile index will use a new forward error correction (FEC) codeword to reduce or improve the bit error rate performance of the OLT receiver after error correction, allowing the OLT to properly receive the optical signal sent by the ONU.

[0147] The following is an example of the newly added definition of different FEC code types in the Burst_Profile message (as described in bytes 6 and 7).

[0148] Table 4 Burst configuration message format

[0149] If the ONU does not support optional FEC and cannot be activated online, it should be classified as an ONU type that cannot be activated online due to the incompatibility between the ONU transmitter specification (i.e., the transmission specification of the optical network terminal in the above embodiment) and the current OLT receiver sensitivity specification (i.e., the access capability of the optical terminal equipment in the above embodiment), and should be replaced by the operator.

[0150] Example 1

[0151] The ONU workflow when the ONU's transmission specification does not match the OLT's receiving capability and the ONU's transmit optical power is adjustable. This embodiment includes two situations: the ONU's transmission specification is higher than the ONU's transmission capability indicated by the OLT, and the ONU's transmission specification is lower than the OLT's transmission capability indicated by the OLT. The following operations are included:

[0152] In step S1, the OLT broadcasts the upstream burst configuration information required for ONUs to go online, as well as the quiet window during which new ONUs can respond to activation and registration. This information includes the ODN class in the OC body of the PSBd data block, the system profile shown in Table 2, the burst profile shown in Table 4, and the SN grant.

[0153] S2: After the ONU is connected to the PON system, it passively receives the downstream physical frame, obtains the upstream burst configuration necessary for the ONU to go online and activate from the PSBd, and attempts to synchronize the clock with the OLT.

[0154] S3. Once the ONU is synchronized, it is necessary to adjust the transmit optical power accordingly based on whether the OLT receiving capability or the ONU transmitting capability indicated by the OLT in the downstream data matches the ONU's own transmission specification.

[0155] The adjustment method is as follows:

[0156] 1) The ONU's transmission specification is higher than the ONU's transmission capability indicated by the OLT. The ONU reduces its transmission optical power to meet the OLT's receiving capability or the ONU's transmission capability indicated by the OLT. 2) The ONU's transmission specification is lower than the ONU's transmission capability indicated by the OLT. The ONU increases its transmission optical power to meet the OLT's receiving capability. After the ONU completes the transmission optical power adjustment, it needs to send a Serial_Number_ONU response message to the OLT in the quiet window specified by the OLT. S4, after the OLT receives the Serial_Number_ONU message sent by the ONU, it will further assign an ONU-ID and Alloc-ID to the newly online ONU through Assign_ONU-ID, and perform Power Levelling adjustment, ranging between the OLT and the ONU, registration, and entering the working state are all the same as in the standard and will not be described in detail here. Optionally, in this embodiment, the ONU may also report to the OLT information such as its transmit power adjustability (referred to as transmit power adjustment capability), transmit power adjustment status, and its own transmit indication information. After receiving such information, the OLT may further update the Burst_Profile assigned to the ONU. Of course, the ONU reporting this information or the OLT updating the ONU's Burst_Profile may also be performed after the ONU enters the normal working state. This is not limited in this embodiment.

[0157] Example 2

[0158] ONU workflow when the ONU transmission specification is lower than the OLT receiving capability and the ONU can only transmit optical power within its own transmission specification.

[0159] After the ONU accesses the PON system, the ONU with low transmission specification directly sends upstream data to the OLT, and can be received normally by the OLT. In this case, the ONU online activation and registration process of this embodiment is consistent with the ONU online activation and registration process specified in the standard, and will not be repeated here.

[0160] Example 3

[0161] The ONU workflow is when the ONU transmission specification is higher than the OLT receiving capability and the ONU can only transmit optical power within its own transmission specification. This includes the following operations:

[0162] In step S1, the OLT broadcasts the upstream burst configuration information required for ONUs to go online, as well as the quiet window during which new ONUs can respond to activation and registration. This information includes the ODN class in the OC body of the PSBd data block, the system profile shown in Table 2, the burst profile shown in Table 4, and the SN grant.

[0163] S2: After the ONU is connected to the PON system, it passively receives the downstream physical frame, obtains the upstream burst configuration necessary for the ONU to go online and activate from the PSBd, and attempts to synchronize the clock with the OLT.

[0164] S3: Once the ONU is synchronized, it automatically attenuates the transmitted optical power by 3 dB and then sends a Serial_Number_ONU response message to the OLT during the quiet window specified by the OLT.

[0165] In this embodiment, although the ONU can only transmit optical power within its own transmission specifications, it supports transmission with attenuation of the transmitted optical power, for example, it supports the Power Levelling function specified in the standard. Once the ONU supports this function, it can automatically configure a 3dB attenuation of the transmitted optical power in S3.

[0166] S4. After the OLT receives the Serial_Number_ONU message sent by the ONU, it further assigns an ONU-ID, Alloc-ID, etc. to the newly online ONU via Assign_ONU-ID, and performs Power Leveling adjustment, ranging between the OLT and the ONU, registration, and entry into the working state. These operations are the same as those in the standard and will not be described in detail here. Optionally, in this embodiment, the ONU may also report to the OLT information such as its transmit optical power adjustability (referred to as transmit power adjustment capability), transmit power adjustment status, and its own transmit indication information. After receiving such information, the OLT may further update the Burst_Profile assigned to the ONU. Of course, the ONU reporting this information or the OLT updating the ONU's Burst_Profile may also be performed after the ONU enters the normal operating state. This is not limited in this embodiment.

[0167] Example 4

[0168] The ONU transmission specification is lower than the OLT receiving capability, and the ONU can only transmit optical power within its own transmission specification. However, the ONU workflow when supporting two or more FECs can be switched online.

[0169] This embodiment is for the case where, after an ONU is connected to a PON system, an ONU with a low transmission specification directly sends upstream data to the OLT, but the OLT cannot receive it normally. For example, the BER output by the receiving end is higher than the BER corresponding to the OLT receiver sensitivity specification. The following operations are included:

[0170] In step S1, the OLT broadcasts the upstream burst configuration information required for ONUs to go online, as well as the quiet window during which new ONUs can respond to activation and registration. This information includes the ODN class in the OC body of the PSBd data block, the system profile shown in Table 2, the burst profile shown in Table 4, and the SN grant.

[0171] S2: After the ONU is connected to the PON system, it passively receives the downstream physical frame, obtains the upstream burst configuration necessary for the ONU to go online and activate from the PSBd, and attempts to synchronize the clock with the OLT.

[0172] S3: Once the ONU is synchronized, it directly sends a Serial_Number_ONU response message to the OLT during the quiet window specified by the OLT.

[0173] In step S4, the OLT receives the upstream optical signal sent by the ONU, but is unable to parse the data properly or monitors that the output BER does not meet the reception requirements for normal system operation. The OLT continues to issue the SN grant and notifies the ONU to use a new forward error correction code (FEC codeword) (for example, the first FEC codeword) for upstream data transmission. The coding gain of the new FEC codeword is higher than that of the original FEC codeword. The notification methods for the FEC codeword include: specifying a Burst_Profile with a new index number in the BWmap for the ONU upstream configuration, or directly specifying a higher coding gain forward error correction code for the upstream through a PLOAM message.

[0174] S5: The ONU resets its upstream transmission configuration according to the new FEC codeword in the data sent by the OLT, and sends a Serial_Number_ONU response message to the OLT during the quiet window specified by the OLT.

[0175] S6. After the OLT receives the Serial_Number_ONU message sent by the ONU, it will further assign an ONU-ID, Alloc-ID, etc. to the newly online ONU through Assign_ONU-ID, and perform power leveling adjustment, ranging between the OLT and the ONU, registration, and entering the working state. These operations are the same as the standard and are not repeated here.

[0176] Optionally, in this embodiment, the ONU in S3 and S5 may also report to the OLT information such as its transmit power adjustability (referred to as transmit power adjustment capability), transmit power adjustment status, and its own transmit indication information. After receiving such information, the OLT may further update the Burst_Profile assigned to the ONU. Of course, the ONU reporting this information or the OLT updating the ONU's Burst_Profile may also be performed after the ONU enters normal operating mode. This is not limited in this embodiment.

[0177] Example 5

[0178] The ONU transmission specification is higher than the OLT receiving capability, and the ONU can only transmit optical power within its own transmission specification, but supports two or more FEC switchable ONU workflows when online. The following operations are included:

[0179] In step S1, the OLT broadcasts the upstream burst configuration information required for ONUs to go online, as well as the quiet window during which new ONUs can respond to activation and registration. This information includes the ODN class in the OC body of the PSBd data block, the system profile shown in Table 2, the burst profile shown in Table 4, and the SN grant.

[0180] S2: After the ONU is connected to the PON system, it passively receives the downstream physical frame, obtains the upstream burst configuration necessary for the ONU to go online and activate from the PSBd, and attempts to synchronize the clock with the OLT.

[0181] S3: Once the ONU is synchronized, it automatically attenuates the transmitted optical power by 3 dB, and then sends a Serial_Number_ONU response message to the OLT in the quiet window specified by the OLT.

[0182] In this embodiment, although the ONU can only transmit optical power within its own transmission specifications, it supports transmitter power attenuation for transmission, for example, it supports the Power Levelling function specified in the standard. Once the ONU supports this function, it can automatically perform a 3dB transmission optical power attenuation configuration in Step 3.

[0183] In step S4, the OLT receives the upstream optical signal sent by the ONU, but is unable to parse the data properly or monitors that the output BER does not meet the reception requirements for normal system operation. The OLT continues to issue the SN grant and notifies the ONU to use a new forward error correction code (FEC codeword) (for example, the first FEC codeword) for upstream data transmission. The coding gain of the new FEC codeword is higher than that of the original FEC codeword. The notification methods for the FEC codeword include: specifying a Burst_Profile with a new index number in the BWmap for the ONU upstream configuration, or directly specifying a higher coding gain forward error correction code for the upstream through a PLOAM message.

[0184] S5: The ONU resets its upstream transmission configuration according to the new FEC codeword in the data sent by the OLT, and sends a Serial_Number_ONU response message to the OLT during the quiet window specified by the OLT.

[0185] S6. After the OLT receives the Serial_Number_ONU message sent by the ONU, it will further assign an ONU-ID, Alloc-ID, etc. to the newly online ONU through Assign_ONU-ID, and perform power leveling adjustment, ranging between the OLT and the ONU, registration, and entering the working state. These operations are the same as the standard and are not repeated here.

[0186] Optionally, in this embodiment, the ONUs in S3 and S5 may also report information such as their transmit power adjustability (referred to as transmit power adjustment capability), transmit power adjustment status, and their own transmit indication information to the OLT. Upon receiving this information, the OLT may further update the Burst_Profile assigned to the ONU. Of course, the ONU reporting this information or the OLT updating the ONU's Burst_Profile may also be performed after the ONU enters normal operating mode. This is not limited in this embodiment.

[0187] In this application, if the transmission specifications of other ONUs do not match the receiving capabilities of the OLT and the ONU cannot be activated and registered online, the OLT will directly report an error.

[0188] In one embodiment, FIG7 is a block diagram of a communication device provided by an embodiment of the present application. This embodiment is applicable to optical central office equipment and optical network terminal equipment. As shown in FIG7 , the communication device in this embodiment includes: a transmitter 710 and a determination module 720.

[0189] The transmitter 710 is configured as an optical central office device to send access capabilities to an optical network terminal device.

[0190] The determination module 720 is configured to determine the transmission parameters of the optical network terminal device according to the access capability.

[0191] In one embodiment, the transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

[0192] In one embodiment, the access capability includes at least one of the following: receiving capability of the optical central office device; transmitting capability of the optical network terminal device; optical distribution network (ODN) level; and forward error correction coding.

[0193] In one embodiment, the receiving capability of the optical terminal device includes: receiver sensitivity; the transmitting capability of the optical network terminal device includes: average transmitted optical power; the optical distribution network ODN level includes at least one of the following: ODN levels corresponding to different optical link loss ranges, ODN levels corresponding to different receiver sensitivities in the same optical link loss range, and ODN levels corresponding to different average transmitted optical powers in the same optical link loss range; and the forward error correction coding includes: at least two different forward error correction codes.

[0194] In one embodiment, the receiver sensitivity includes at least one of the following: sensitivity at a given bit error rate (BER), and OMA sensitivity at a given bit error rate (BER); the average transmitted optical power includes at least one of the following: minimum average transmitted power, minimum OMA-TDEC transmitted power, and minimum OMA transmitted power.

[0195] In one embodiment, the access capability is sent in at least one of the following ways: broadcasting the access capability; multicasting the access capability; and unicasting the access capability.

[0196] In one embodiment, the access capability includes any one of the following: a value indicating the access capability, an identifier indicating the access capability.

[0197] In one embodiment, the transmission parameter includes: the transmission optical power of the optical network terminal device; the optical network terminal device determines the transmission parameter according to the access capability, including one of the following:

[0198] If the transmission specification of the optical network terminal device is higher than the access capability, the optical network terminal device reduces its transmitted optical power to meet the access capability; if the transmission specification of the optical network terminal device is lower than the access capability, the optical network terminal device increases its transmitted optical power to meet the access capability; if the transmission specification of the optical network terminal device is lower than the access capability, the optical network terminal device transmits optical power according to its own transmission specification.

[0199] In one embodiment, the transmission specification of the optical network terminal device includes: average transmission optical power; the average transmission optical power includes at least one of the following: minimum average transmission power, minimum OMA-TDEC transmission power, and minimum OMA transmission power.

[0200] In one embodiment, the transmission parameters include: the transmission optical power of the optical network terminal device; if the transmission specification of the optical network terminal device is higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power within its own transmission specification, the optical network terminal device determines the transmission parameters according to the access capability, including:

[0201] The optical network terminal device automatically performs an attenuation operation of the first preset power.

[0202] In one embodiment, the transmission parameters include: forward error correction coding of the optical network terminal device; if the transmission specification of the optical network terminal device is lower than the receiving capability of the optical central office device, the optical network terminal device determines the transmission parameters according to the access capability, including one of the following:

[0203] The optical network terminal device switches from the default FEC codeword to the first FEC codeword, wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword; the optical network terminal device uses the first high-gain FEC codeword, wherein the coding gain of the first high-gain FEC codeword is greater than the coding gain of other FEC codewords.

[0204] In one embodiment, the transmission parameters include: the transmission optical power and forward error correction code of the optical network terminal device; if the transmission specification of the optical network terminal device is higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power within its own transmission specification, the optical network terminal device determines the transmission parameters according to the access capability, including:

[0205] The optical network terminal device automatically performs an attenuation operation of a first preset power; if the power of the optical signal sent by the optical network terminal device to the optical central office device does not meet the receiving capability of the optical central office device, the optical network terminal device switches from the default FEC codeword to the first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword.

[0206] In one embodiment, the notification method of the first FEC codeword includes one of the following: specifying the burst configuration information of the new index number for the optical network terminal device in the bandwidth allocation mapping table; specifying the optical network terminal device to use the first FEC codeword with a higher coding gain than the default FEC codeword through a first management message.

[0207] In one embodiment, the communication method further includes: the optical central office device receiving the transmission power adjustment capability, transmission power adjustment status and transmission instruction information reported by the optical network terminal device.

[0208] In one embodiment, the transmit power adjustment capability and transmit power adjustment status are carried in a sequence number message.

[0209] In one embodiment, the communication method further includes: the optical central office device receiving a response message of the serial number authorization sent by the optical network terminal device within a pre-configured quiet window according to the transmission parameters.

[0210] The communication device provided in this embodiment is configured to implement the communication method applied to the optical central office device and the optical network terminal device of the embodiment shown in FIG3 . The implementation principle and technical effects of the communication device provided in this embodiment are similar and will not be described in detail here.

[0211] In one embodiment, FIG8 is a block diagram of another communication device provided by an embodiment of the present application. This embodiment is applied to an optical central office device. As shown in FIG8 , the communication device in this embodiment includes: a transmitter 810.

[0212] The transmitter 810 is configured to send the access capability to the optical network terminal device, so that the optical network terminal device determines the transmission parameters according to the access capability.

[0213] In one embodiment, the transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

[0214] In one embodiment, the access capability includes at least one of the following: receiving capability of the optical central office device; transmitting capability of the optical network terminal device; optical distribution network (ODN) level; and forward error correction coding.

[0215] In one embodiment, the receiving capability of the optical terminal device includes: receiver sensitivity; the transmitting capability of the optical network terminal device includes: average transmitted optical power; the optical distribution network ODN level includes at least one of the following: ODN levels corresponding to different optical link loss ranges, ODN levels corresponding to different receiver sensitivities in the same optical link loss range, and ODN levels corresponding to different average transmitted optical powers in the same optical link loss range; and the forward error correction coding includes: at least two different forward error correction codes.

[0216] In one embodiment, the receiver sensitivity includes at least one of the following: sensitivity at a given bit error rate (BER), and OMA sensitivity at a given bit error rate (BER); the average transmitted optical power includes at least one of the following: minimum average transmitted power, minimum OMA-TDEC transmitted power, and minimum OMA transmitted power.

[0217] In one embodiment, the access capability is sent in at least one of the following ways: broadcasting the access capability; multicasting the access capability; and unicasting the access capability.

[0218] In one embodiment, the access capability includes any one of the following: a value indicating the access capability, an identifier indicating the access capability.

[0219] In one embodiment, the transmission parameter includes: the transmission optical power of the optical network terminal device; the optical network terminal device determines the transmission parameter according to the access capability, including one of the following:

[0220] If the transmission specification of the optical network terminal device is higher than the access capability, the optical network terminal device reduces its transmitted optical power to meet the access capability; if the transmission specification of the optical network terminal device is lower than the access capability, the optical network terminal device increases its transmitted optical power to meet the access capability; if the transmission specification of the optical network terminal device is lower than the access capability, the optical network terminal device transmits optical power according to its own transmission specification.

[0221] In one embodiment, the transmission specification of the optical network terminal device includes: average transmission optical power; the average transmission optical power includes at least one of the following: minimum average transmission power, minimum OMA-TDEC transmission power, and minimum OMA transmission power.

[0222] In one embodiment, the transmission parameters include: the transmission optical power of the optical network terminal device; if the transmission specification of the optical network terminal device is higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power within its own transmission specification, the optical network terminal device determines the transmission parameters according to the access capability, including:

[0223] The optical network terminal device automatically performs an attenuation operation of the first preset power.

[0224] In one embodiment, the transmission parameters include: forward error correction coding of the optical network terminal device; if the transmission specification of the optical network terminal device is lower than the receiving capability of the optical central office device, the optical network terminal device determines the transmission parameters according to the access capability, including one of the following:

[0225] The optical network terminal device switches from the default FEC codeword to the first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword; the optical network terminal device uses the first high-gain FEC codeword, wherein the coding gain of the first high-gain FEC codeword is greater than the coding gain of other FEC codewords.

[0226] In one embodiment, the transmission parameters include: the transmission optical power and forward error correction code of the optical network terminal device; if the transmission specification of the optical network terminal device is higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power within its own transmission specification, the optical network terminal device determines the transmission parameters according to the access capability, including:

[0227] The optical network terminal device automatically performs an attenuation operation of a first preset power; if the power of the optical signal sent by the optical network terminal device to the optical central office device does not meet the receiving capability of the optical central office device, the optical network terminal device switches from the default FEC codeword to the first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword.

[0228] In one embodiment, the notification method of the first FEC codeword includes one of the following: specifying the burst configuration information of the new index number for the optical network terminal device in the bandwidth allocation mapping table; specifying the optical network terminal device to use the first FEC codeword with a higher coding gain than the default FEC codeword through a first management message.

[0229] In one embodiment, the communication device applied to the optical central office equipment further includes:

[0230] The receiver is configured to receive the transmit power adjustment capability, transmit power adjustment status and transmit indication information reported by the optical network terminal device.

[0231] In one embodiment, the communication device applied to the optical central office equipment further includes:

[0232] The receiver is further configured to receive a response message of the serial number authorization sent by the optical network terminal device according to the transmission parameters within a pre-configured quiet window.

[0233] The communication device provided in this embodiment is configured to implement the communication method applied to the optical central office device of the embodiment shown in FIG4 . The implementation principle and technical effects of the communication device provided in this embodiment are similar and will not be described in detail here.

[0234] In one embodiment, FIG9 is a block diagram of another communication device provided by an embodiment of the present application. This embodiment is applied to an optical network terminal device. As shown in FIG9 , the communication device in this embodiment includes: a receiver 910 and a determination module 920.

[0235] The receiver 910 is configured to receive the access capability sent by the optical central office device.

[0236] The determination module 920 is configured to determine the transmission parameters according to the access capability.

[0237] In one embodiment, the transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

[0238] In one embodiment, the access capability includes at least one of the following: receiving capability of the optical central office device; transmitting capability of the optical network terminal device; optical distribution network (ODN) level; and forward error correction coding.

[0239] In one embodiment, the receiving capability of the optical terminal device includes: receiver sensitivity; the transmitting capability of the optical network terminal device includes: average transmitted optical power; the optical distribution network ODN level includes at least one of the following: ODN levels corresponding to different optical link loss ranges, ODN levels corresponding to different receiver sensitivities in the same optical link loss range, and ODN levels corresponding to different average transmitted optical powers in the same optical link loss range; and the forward error correction coding includes: at least two different forward error correction codes.

[0240] In one embodiment, the receiver sensitivity includes at least one of the following: sensitivity at a given bit error rate (BER), and OMA sensitivity at a given bit error rate (BER); the average transmitted optical power includes at least one of the following: minimum average transmitted power, minimum OMA-TDEC transmitted power, and minimum OMA transmitted power.

[0241] In one embodiment, the access capability is sent in at least one of the following ways: broadcasting the access capability; multicasting the access capability; and unicasting the access capability.

[0242] In one embodiment, the access capability includes any one of the following: a value indicating the access capability, an identifier indicating the access capability.

[0243] In one embodiment, the transmission parameters include: the transmission optical power of the optical network terminal device; the transmission parameters are determined according to the access capability, including one of the following:

[0244] If the transmission specification of the optical network terminal device is higher than the access capability, the optical network terminal device reduces its transmitted optical power to meet the access capability; if the transmission specification of the optical network terminal device is lower than the access capability, the optical network terminal device increases its transmitted optical power to meet the access capability; if the transmission specification of the optical network terminal device is lower than the access capability, the optical network terminal device transmits optical power according to its own transmission specification.

[0245] In one embodiment, the transmission specification of the optical network terminal device includes: average transmission optical power; the average transmission optical power includes at least one of the following: minimum average transmission power, minimum OMA-TDEC transmission power, and minimum OMA transmission power.

[0246] In one embodiment, the transmission parameters include: the transmission optical power of the optical network terminal device; if the transmission specification of the optical network terminal device is higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power within its own transmission specification, the transmission parameters are determined according to the access capability, including:

[0247] The optical network terminal device automatically performs an attenuation operation of the first preset power.

[0248] In one embodiment, the transmission parameters include: forward error correction coding of the optical network terminal device; if the transmission specification of the optical network terminal device is lower than the receiving capability of the optical central office device, the transmission parameters are determined according to the access capability, including one of the following:

[0249] The optical network terminal device switches from the default FEC codeword to the first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword; the optical network terminal device uses the first high-gain FEC codeword, wherein the coding gain of the first high-gain FEC codeword is greater than the coding gain of other FEC codewords.

[0250] In one embodiment, the transmission parameters include: the transmission optical power and forward error correction code of the optical network terminal device; if the transmission specification of the optical network terminal device is higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power within its own transmission specification, the transmission parameters are determined according to the access capability, including:

[0251] The optical network terminal device automatically performs an attenuation operation of a first preset power; if the power of the optical signal sent by the optical network terminal device to the optical central office device does not meet the receiving capability of the optical central office device, the optical network terminal device switches from the default FEC codeword to the first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword.

[0252] In one embodiment, the notification method of the first FEC codeword includes one of the following: specifying the burst configuration information of the new index number for the optical network terminal device in the bandwidth allocation mapping table; specifying the optical network terminal device to use the first FEC codeword with a higher coding gain than the default FEC codeword through a first management message.

[0253] In one embodiment, the communication device applied to the optical network terminal equipment further includes:

[0254] The reporting module is configured to report the transmit power adjustment capability, transmit power adjustment status and transmit instruction information to the optical central office device.

[0255] In one embodiment, the communication device applied to the optical network terminal equipment further includes:

[0256] The transmitter is configured to send a response message of the serial number authorization to the optical central office device within a pre-configured quiet window according to the transmission parameters.

[0257] The communication device provided in this embodiment is configured to implement the communication method applied to an optical network terminal device in the embodiment shown in FIG5 . The implementation principle and technical effects of the communication device provided in this embodiment are similar and will not be described in detail here.

[0258] In one embodiment, Figure 10 is a schematic diagram of the structure of a communication device provided by an embodiment of the present application. As shown in Figure 10, the device provided by the present application includes: a processor 1010, a memory 1020, and a communication module 1030. The number of processors 1010 in the device can be one or more, and Figure 10 uses one processor 1010 as an example. The number of memories 1020 in the device can be one or more, and Figure 10 uses one memory 1020 as an example. The processor 1010, memory 1020, and communication module 1030 of the device can be connected via a bus or other means, and Figure 10 uses bus connection as an example. In this embodiment, the device can be an optical central office device or an optical network terminal device.

[0259] The memory 1020, as a computer-readable storage medium, can be configured to store software programs, computer executable programs, and modules, such as program instructions / modules corresponding to the device of any embodiment of the present application (for example, the transmitter 710 and the determination module 720 in the communication device). The memory 1020 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the device, etc. In addition, the memory 1020 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 1020 may further include a memory remotely located relative to the processor 1010, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0260] In the case where the communication device is an optical local terminal device, the device provided above can be configured to execute the communication method applied to the optical local terminal device provided in any of the above embodiments, and have corresponding functions and effects.

[0261] In the case where the communication device is an optical network terminal device, the device provided above can be configured to execute the communication method applied to the optical network terminal device provided in any of the above embodiments, and have corresponding functions and effects.

[0262] An embodiment of the present application also provides a storage medium containing computer-executable instructions. When the computer-executable instructions are executed by a computer processor, they are used to perform a communication method. Before the optical central office device assigns an optical network terminal device identifier, the method includes: the optical central office device sends access capabilities to the optical network terminal device; the optical network terminal device determines transmission parameters according to the access capabilities.

[0263] An embodiment of the present application also provides a storage medium containing computer-executable instructions. When the computer-executable instructions are executed by a computer processor, they are used to execute a communication method applied to an optical terminal device. Before the optical terminal device assigns an optical network terminal device identifier, the method includes: sending access capabilities to the optical network terminal device so that the optical network terminal device determines transmission parameters according to the access capabilities.

[0264] An embodiment of the present application also provides a storage medium containing computer-executable instructions. When the computer-executable instructions are executed by a computer processor, they are used to execute a communication method applied to an optical network terminal device. Before the optical central office device assigns an optical network terminal device identifier to the optical network terminal device, the method includes: receiving access capabilities sent by the optical central office device; and determining transmission parameters according to the access capabilities.

[0265] It will be appreciated by those skilled in the art that the term user equipment encompasses any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable web browser or a car-mounted mobile station.

[0266] In general, various embodiments of the present application may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, although the present application is not limited thereto.

[0267] Embodiments of the present application may be implemented by executing computer program instructions by a data processor of a mobile device, for example, in a processor entity, or by hardware, or by a combination of software and hardware. The computer program instructions may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages.

[0268] Any block diagram of the logic flow in the drawings of the present application may represent program operations, or may represent interconnected logic circuits, modules and functions, or may represent a combination of program operations and logic circuits, modules and functions. A computer program may be stored on a memory. The memory may be of any type suitable for the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, read-only memory (ROM), random access memory (RAM), optical storage devices and systems (digital versatile discs (DVD) or compact disks (CD)), etc. Computer-readable media may include non-transient storage media. A data processor may be of any type suitable for the local technical environment, such as, but not limited to, a general-purpose computer, a special-purpose computer, a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), and a processor based on a multi-core processor architecture.

Claims

1. A communication method, before an optical central office device assigns an identifier to an optical network terminal device, comprising: The optical central office device sends access capabilities to the optical network terminal device; The optical network terminal equipment determines transmission parameters according to the access capability.

2. The method according to claim 1, wherein The transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

3. The method according to claim 1, wherein The access capability includes at least one of the following: the receiving capability of the optical central office device; the transmitting capability of the optical network terminal device; the optical distribution network ODN level; and forward error correction coding.

4. The method according to claim 3, wherein: The receiving capability of the optical central office equipment includes: receiver sensitivity; The transmission capability of the optical network terminal device includes: average transmission optical power; The ODN level includes at least one of the following: ODN levels corresponding to different optical link loss ranges, ODN levels corresponding to different receiver sensitivities in the same optical link loss range, and ODN levels corresponding to different average transmitted optical powers in the same optical link loss range; The forward error correction code includes: at least two different forward error correction codes.

5. The method according to claim 4, wherein The receiver sensitivity includes at least one of the following: sensitivity under a given bit error rate (BER), optical modulation amplitude (OMA) sensitivity under a given BER; The average optical transmit power includes at least one of the following: minimum average transmit power, minimum OMA-Transmission Dispersion Eye Closure (TDEC) transmit power, and minimum OMA transmit power.

6. The method according to claim 1, wherein The sending mode of the access capability includes at least one of the following: broadcast sending of the access capability; multicast sending of the access capability; unicast sending of the access capability.

7. The method according to claim 1, wherein The access capability includes one of the following: a value indicating the access capability, and an identifier indicating the access capability.

8. The method according to claim 1, wherein The transmission parameters include: the transmission optical power of the optical network terminal device; the optical network terminal device determines the transmission parameters according to the access capability, including one of the following: In response to the transmission specification of the optical network terminal device being higher than the access capability, the optical network terminal device reduces the transmission optical power of the optical network terminal device to meet the access capability; In response to the transmission specification of the optical network terminal device being lower than the access capability, the optical network terminal device increases the transmission optical power of the optical network terminal device to meet the access capability; In response to the transmission specification of the optical network terminal device being lower than the access capability, the optical network terminal The end device transmits optical power according to its own transmission specifications.

9. The method according to claim 8, wherein The transmission specifications of the optical network terminal equipment include: average transmission optical power; The average transmitted optical power includes at least one of the following: minimum average transmitted power, minimum OMA-TDEC transmitted power, and minimum OMA transmitted power.

10. The method according to claim 1, wherein The transmission parameters include: the transmission optical power of the optical network terminal device; in response to the transmission specification of the optical network terminal device being higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power under its own transmission specification, the optical network terminal device determines the transmission parameters according to the access capability, including: The optical network terminal equipment automatically performs an attenuation operation of the first preset power.

11. The method according to claim 1, wherein The transmission parameters include: forward error correction coding of the optical network terminal device; in response to the transmission specification of the optical network terminal device being lower than the receiving capability of the optical central office device, the optical network terminal device determines the transmission parameters according to the access capability, including one of the following: The optical network terminal device switches from a default forward error correction FEC codeword to a first FEC codeword, wherein a coding gain of the first FEC codeword is greater than a coding gain of the default FEC codeword; The optical network terminal device uses a first high-gain FEC codeword, wherein the coding gain of the first high-gain FEC codeword is greater than the coding gains of other FEC codewords.

12. The method according to claim 1, wherein The transmission parameters include: the transmission optical power and forward error correction coding of the optical network terminal equipment; In response to the transmission specification of the optical network terminal device being higher than the receiving capability of the optical central office device, and the optical network terminal device being able to transmit optical power only under its own transmission specification, the optical network terminal device determining the transmission parameters according to the access capability, comprising: The optical network terminal device automatically performs a first preset power attenuation operation; In response to the optical signal power sent by the optical network terminal device to the optical central office device not meeting the receiving capability of the optical central office device, the optical network terminal device switches from a default FEC codeword to a first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword.

13. The method according to claim 11 or 12, wherein: The notification method of the first FEC codeword includes one of the following: specifying the burst configuration information of the new index number used by the optical network terminal device in the bandwidth allocation mapping table; specifying the optical network terminal device to use a first FEC codeword with a higher coding gain than the default FEC codeword through a first management message.

14. The method according to any one of claims 1 to 12, further comprising: The optical central office device receives the transmission power adjustment capability, transmission power adjustment status and transmission instruction information reported by the optical network terminal device.

15. The method according to claim 14, wherein The transmit power adjustment capability and the transmit power adjustment status are carried by a sequence number message.

16. The method according to any one of claims 1 to 12, further comprising: The optical central office device receives a response message of the serial number authorization sent by the optical network terminal device within a pre-configured quiet window according to the transmission parameters.

17. A communication method, applied to an optical central office device, comprising: The access capability is sent to the optical network terminal device, so that the optical network terminal device determines the transmission parameters according to the access capability.

18. The method according to claim 17, wherein The transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

19. The method according to claim 17, wherein The access capability includes at least one of the following: receiving capability of optical central office equipment; transmitting capability of optical network terminal equipment; optical distribution network ODN level; forward error correction coding.

20. The method according to claim 17, wherein The transmission parameters include: the transmission optical power of the optical network terminal device; the optical network terminal device determines the transmission parameters according to the access capability, including one of the following: In response to the transmission specification of the optical network terminal device being higher than the access capability, the optical network terminal device reduces the transmission optical power of the optical network terminal device to meet the access capability; In response to the transmission specification of the optical network terminal device being lower than the access capability, the optical network terminal device increases the transmission optical power of the optical network terminal device to meet the access capability; In response to the transmission specification of the optical network terminal device being lower than the access capability, the optical network terminal device transmits optical power according to its own transmission specification.

21. The method according to claim 17, wherein The transmission parameters include: the transmission optical power of the optical network terminal device; in response to the transmission specification of the optical network terminal device being higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power under its own transmission specification, the optical network terminal device determines the transmission parameters according to the access capability, including: The optical network terminal equipment automatically performs an attenuation operation of the first preset power.

22. The method according to claim 17, wherein The transmission parameters include: forward error correction coding of the optical network terminal device; in response to the transmission specification of the optical network terminal device being lower than the receiving capability of the optical central office device, the optical network terminal device determines the transmission parameters according to the access capability, including one of the following: The optical network terminal device switches from a default forward error correction FEC codeword to a first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword; The optical network terminal device uses a first high-gain FEC codeword, wherein the coding gain of the first high-gain FEC codeword is greater than the coding gains of other FEC codewords.

23. The method according to claim 17, wherein The transmission parameters include: the transmission optical power and forward error correction coding of the optical network terminal equipment; In response to the transmission specification of the optical network terminal device being higher than the receiving capability of the optical central office device, and the optical network terminal device being able to transmit optical power only under its own transmission specification, the optical network terminal device determining the transmission parameters according to the access capability, comprising: The optical network terminal device automatically performs a first preset power attenuation operation; In response to the optical signal power sent by the optical network terminal device to the optical central office device not meeting the receiving capability of the optical central office device, the optical network terminal device switches from a default FEC codeword to a first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword.

24. The method according to claim 22 or 23, wherein The notification method of the first FEC codeword includes one of the following: specifying the burst configuration information of the new index number used by the optical network terminal device in the bandwidth allocation mapping table; specifying the optical network terminal device to use a first FEC codeword with a higher coding gain than the default FEC codeword through a first management message.

25. The method according to any one of claims 17 to 23, further comprising: Receive the transmission power adjustment capability, transmission power adjustment status and transmission instruction information reported by the optical network terminal equipment.

26. The method according to any one of claims 17 to 23, further comprising: Receive a response message of the serial number authorization sent by the optical network terminal device according to the transmission parameters within a pre-configured quiet window.

27. A communication method, applied to an optical network terminal device, comprising: receiving the access capability sent by the optical central office device; Transmission parameters are determined according to the access capability.

28. The method according to claim 27, wherein The transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

29. The method according to claim 27, wherein The access capability includes at least one of the following: receiving capability of optical central office equipment; transmitting capability of optical network terminal equipment; optical distribution network ODN level; forward error correction coding.

30. The method of claim 27, wherein: The transmission parameters include: the transmission power rate of the optical network terminal device; the transmission parameters determined according to the access capability include one of the following: In response to the transmission specification of the optical network terminal device being higher than the access capability, the optical network terminal device reduces the transmission optical power of the optical network terminal device to meet the access capability; In response to the transmission specification of the optical network terminal device being lower than the access capability, the optical network terminal device increases the transmission optical power of the optical network terminal device to meet the access capability; In response to the transmission specification of the optical network terminal device being lower than the access capability, the optical network terminal device transmits optical power according to its own transmission specification.

31. The method of claim 27, wherein: The transmission parameters include: the transmission optical power of the optical network terminal device; in response to the transmission specification of the optical network terminal device being higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power under its own transmission specification, the transmission parameters are determined according to the access capability, including: The optical network terminal equipment automatically performs an attenuation operation of the first preset power.

32. The method of claim 27, wherein: The transmission parameters include: forward error correction coding of the optical network terminal device; in response to the transmission specification of the optical network terminal device being lower than the receiving capability of the optical central office device, the transmission parameters are determined according to the access capability, including one of the following: The optical network terminal device switches from a default forward error correction FEC codeword to a first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword; The optical network terminal device uses a first high-gain FEC codeword, wherein the coding gain of the first high-gain FEC codeword is greater than the coding gains of other FEC codewords.

33. The method of claim 27, wherein: The transmission parameters include: the transmission optical power and forward error correction coding of the optical network terminal equipment; In response to the transmission specification of the optical network terminal device being higher than the receiving capability of the optical central office device, and the optical network terminal device can only transmit optical power under its own transmission specification, the determining of the transmission parameters according to the access capability includes: The optical network terminal device automatically performs a first preset power attenuation operation; In response to the optical signal power sent by the optical network terminal device to the optical central office device not meeting the receiving capacity of the optical central office device, the optical network terminal device switches from the default FEC codeword to the first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword.

34. The method according to claim 32 or 33, wherein The notification method of the first FEC codeword includes one of the following: specifying the burst configuration information of the new index number used by the optical network terminal device in the bandwidth allocation mapping table; specifying the optical network terminal device to use a first FEC codeword with a higher coding gain than the default FEC codeword through a first management message.

35. The method according to any one of claims 27 to 33, further comprising: Report the transmit power adjustment capability, transmit power adjustment status and transmit instruction information to the optical central office device.

36. The method according to any one of claims 27 to 33, further comprising: A response message of serial number authorization is sent to the optical central office device within a pre-configured quiet window according to the transmission parameters.

37. A communication device comprising: memory, and at least one processor; The memory is configured to store at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the communication method as described in any one of claims 1-16, 17-26 or 27-36.

38. A storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the communication method according to any one of claims 1 to 16, 17 to 26, or 27 to 36.

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