Communication method and device, and storage medium

Abstract

The invention provides a communication method, equipment and a storage medium. The communication method comprises the following steps that: before optical local side equipment distributes an optical network terminal equipment identifier, the optical local side equipment sends access capability to optical network terminal equipment; and the optical network terminal device determines a transmission parameter according to the access capability.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method, device and storage medium. 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. Summary of the Invention

[0003] In view of this, 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 prior art.

[0004] The present application provides a communication method, which includes:

[0005] The optical central office equipment sends access capabilities to the optical network terminal equipment;

[0006] The optical network terminal equipment determines transmission parameters according to the access capability.

[0007] An embodiment of 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] Access capability of receiving data sent by optical central office equipment;

[0011] Transmission parameters are determined according to the access capability.

[0012] An embodiment of the present application provides a communication device, comprising: a memory, and one or more processors;

[0013] The memory is configured to store one or more programs;

[0014] When the one or more programs are executed by the one or more processors, the one or more processors implement the method described in any one of the above embodiments.

[0015] An embodiment of the present application provides a storage medium storing a computer program. When the computer program is executed by a processor, the method described in any one of the above embodiments is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the implementation of two different PON transceiver specifications at the same ODN level provided by the existing technology;

[0017] Figure 2 This 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 existing technology;

[0018] Figure 3 This is a flow chart of a communication method provided by an embodiment of the present application;

[0019] Figure 4 is a flow chart of another communication method provided by an embodiment of the present application;

[0020] Figure 5 This is a flow chart of another communication method provided by an embodiment of the present application;

[0021] Figure 6 This is a schematic diagram of the configuration of an OC body of a PSBd downlink physical synchronization block provided by an embodiment of the present application;

[0022] Figure 7 This is a structural block diagram of a communication device provided in an embodiment of the present application;

[0023] Figure 8 This is a structural block diagram of another communication device provided in an embodiment of the present application;

[0024] Figure 9 This is a structural block diagram of another communication device provided in an embodiment of the present application;

[0025] Figure 10 It is a structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] 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.

[0027] In existing PON systems, 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.

[0028] Figure 1 This is a schematic diagram of the implementation of two different PON transceiver specifications at the same ODN level provided by the existing technology, such as Figure 1 As shown in the figure, at the same ODN level, there are two different PON transceiver specifications. Among them, ONUs with high transmit power specifications need to access OLTs with high receive power specifications; and ONUs with high transmit power specifications need to access OLTs with high receive power specifications.

[0029] 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, existing technologies standardize the Power Leveling function, which 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 feedbacks the currently adjusted transmit optical power via Serial_Number_ONU.

[0030] Currently, apart from the power levelling mechanism, ONUs have no other way to adjust the transmit power. Figure 2 This 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 existing technology. Figure 2As shown, power leveling only attenuates the transmitter's optical power in 3dB increments. This power adjustment method doesn't effectively address compatibility issues between different transceiver specifications within the same ODN. For example, an ONU with a low transmit optical power standard cannot guarantee the OLT's receiver sensitivity requirements for high-power transceiver specifications. Similarly, an ONU with a high transmit optical power standard, after attenuating it by 3dB through power leveling, cannot guarantee the OLT's receiver sensitivity requirements for high-power transceiver specifications. Furthermore, directly connecting an ONU with a high transmit optical power standard to a PON network with low-power transceiver specifications may cause OLT receiver overload.

[0031] Power leveling can partially resolve compatibility issues. Specifically, 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 lower receive 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 ONU transmit optical powers: nominal optical power, nominal optical power -3dB, and nominal optical power -6dB. This, to a certain extent, can address the issue of high-transmit power ONUs overloading the receiver of low-receive power OLTs. However, it's worth noting that the original purpose of the Power Leveling feature wasn't to resolve the aforementioned compatibility issues, but rather to enable ONU energy conservation. Using the Power Levelling feature to address the aforementioned compatibility issues still requires revisions and doesn't fully resolve the issue.

[0032] Power Levelling includes two ONU transmit optical power adjustment methods:

[0033] The first method: Power adjustment and activation by ONU

[0034] 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:

[0035] The ONU passively receives the downstream data frames from the OLT and receives PSync for superframe synchronization;

[0036] After the ONU completes superframe synchronization, it waits for the Upstream_Overhead PLOAM message and, optionally, for the Extended_Burst_Length PLOAM message.

[0037] The ONU receives and configures the PON's operating parameters, such as the pre-assigned delay and initial optical power level. Note that the ONU cannot adjust the initial optical power level; it transmits upstream optical signals based on the power level set by the OLT.

[0038] 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.

[0039] When the Power Leveling function is enabled on an ONU, it adjusts its transmit optical power in a continuous cycle and sends 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 current transmit optical power used. The ONU adjusts the power in a modulo 3 cycle (0, 1, 2, 0, 1, 2). The entire cycle continues until the ONU receives a Disable ONU message or an Assign_ONU-ID message from the OLT.

[0040] After the OLT discovers the Serial_Number_ONU of the new ONU, it assigns an ONU-ID to the ONU through the Assign_ONU-ID direct message;

[0041] The OLT uses the bandwidth mapping table to send a direct serial number request to the newly connected ONU and accurately measures its response time.

[0042] 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.

[0043] The ONU adjusts the start time of its GTC frame based on the equivalent delay EqD, completes the online plan, and enters normal operation.

[0044] 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.

[0045] The second method: Power adjustment and activation by OLT

[0046] 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.

[0047] In the existing standard, the power leveling function has been inherited. When the ONU responds to the SN grant (SNgrant), 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.

[0048] It should be noted that the optical terminal equipment in the embodiment of the present application may include: OLT in the PON system, or master device (MFU) in the fiber to the room (FTTR); correspondingly, the optical network terminal equipment may include: ONU in the PON system, or slave device (SFU) in the FTTR.

[0049] In one embodiment, Figure 3 This is a flow chart of a communication method provided by an embodiment of the present application. This embodiment is applied to the case where multiple different access machine indicators are compatible. This embodiment can be executed by an optical central office device and an optical network terminal device. Figure 3 As shown, this embodiment includes: S310-S320.

[0050] S310. The optical central office device sends access capabilities to the optical network terminal device.

[0051] 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.

[0052] S320. The optical network terminal device determines transmission parameters according to access capability.

[0053] 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.

[0054] In one embodiment, the transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

[0055] In one embodiment, 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 (FEC) coding. In one example, the optical central office device can explicitly transmit the access capability to the optical network terminal device, i.e., the optical central office device directly transmits the receiving capability and / or transmitting capability of the optical central office 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 transmit the access capability to the optical network terminal device. For example, the optical central office device can transmit the ODN level to the optical network terminal device, and the optical network terminal device can compare the ODN level with the physical layer specification and obtain the receiving capability and transmitting capability of the optical central office device at the current ODN level. In one example, the optical central office device can also transmit the FEC coding to the optical network terminal device. The optical network terminal device can encode the coding according to the default FEC codeword or other newly added FEC codeword so that its transmitted optical power can meet the receiving capability of the optical central office device or the transmitting capability of the optical network terminal device matched by the optical central office device. In one example, the transmission capability of the optical network terminal device refers to a transmission capability that matches a receiver specification of the optical central office device.

[0056] In one embodiment, the receiving capability of the optical central office device includes: receiver sensitivity;

[0057] The transmission capability of optical network terminal equipment includes: average transmitted optical power;

[0058] 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;

[0059] The forward error correction code includes at least two different forward error correction codes. In one example, the coding gain of the FEC codeword corresponding to each forward error correction code is different.

[0060] In one embodiment, the receiver sensitivity includes at least one of the following: sensitivity at a given bit error rate (BER), optical modulation amplitude (OMA) sensitivity at a given bit error rate (BER);

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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:

[0065] If the transmission specification of the optical network terminal device is higher than the access capability, the optical network terminal device reduces its transmission optical power to meet the access capability;

[0066] If the transmission specification of the optical network terminal device is lower than the access capacity, the optical network terminal device increases its transmission optical power to meet the access capacity;

[0067] 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. In one example, the transmission specification of the optical network terminal device can be understood as the transmission specification configured when the optical network terminal device leaves the factory; the access capability can be understood as the access capability that matches the optical central office device.

[0068] In one embodiment, the transmission specification of the optical network terminal device includes: average transmitted optical power;

[0069] 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.

[0070] 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:

[0071] The minimum average transmission power of the optical network terminal equipment is higher than the minimum average transmission power sent by the optical central office equipment;

[0072] 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;

[0073] 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;

[0074] The minimum average transmit power of the optical network terminal device is higher than the sum of the sensitivity of the optical central office device at a given bit error rate (BER) and the optical link budget between the optical network terminal device and the optical central office device;

[0075] The minimum OMA transmission power of the optical network terminal device is higher than the sum of the OMA sensitivity at a given bit error rate (BER) transmitted by the optical central office device and the optical link budget between the optical network terminal device and the optical central office device.

[0076] 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:

[0077] The minimum average transmission power of the optical network terminal equipment is lower than the minimum average transmission power sent by the optical central office equipment;

[0078] 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;

[0079] 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;

[0080] The minimum average transmit power of the optical network terminal device is lower than the sum of the sensitivity of the optical central office device at a given bit error rate (BER) and the optical link budget between the optical network terminal device and the optical central office device;

[0081] The minimum OMA transmission power of the optical network terminal device is lower than the sum of the OMA sensitivity at a given bit error rate (BER) transmitted by the optical central office device and the optical link budget between the optical network terminal device and the optical central office device.

[0082] 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.

[0083] 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:

[0084] The optical network terminal device automatically performs a first preset power attenuation operation. In one example, the first preset power can 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 can automatically attenuate its transmit optical power by one or more of the first preset powers. For example, if the first preset power can be 3dB, the optical network terminal device can attenuate its transmit optical power by 1-7 integer multiples of 3dB.

[0085] 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:

[0086] The optical network terminal device switches from a default 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;

[0087] The optical network terminal device uses a first high-gain FEC codeword, wherein a coding gain of the first high-gain FEC codeword is greater than coding gains of other FEC codewords.

[0088] 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.

[0089] In one embodiment, the transmission parameters include: the transmission optical power and forward error correction coding of the optical network terminal device;

[0090] 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:

[0091] The optical network terminal device automatically performs a first preset power attenuation operation;

[0092] 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 a first FEC codeword; wherein the coding gain of the first FEC codeword is greater than the coding gain of the default FEC codeword. In one example, if the transmission specification of the optical network terminal device exceeds the receiving capability of the optical central office device, the optical network terminal device may first attenuate the power by a first preset value. If the power of the optical signal sent by the optical network terminal device to the optical central office device still does not 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 does not 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. Among them, 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; the coding gain of the NFEC codeword is greater than the coding gain of the N-1 FEC codeword.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] In one embodiment, Figure 4 This is a flow chart of another communication method provided by an embodiment of the present application. This embodiment is applied to the case where multiple different access machine indicators are compatible. This embodiment can be executed by an optical terminal device. Figure 4 As shown, this embodiment includes: S410.

[0098] 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.

[0099] In one embodiment, the transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

[0100] 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.

[0101] In one embodiment, the receiving capability of the optical central office device includes: receiver sensitivity;

[0102] The transmission capability of optical network terminal equipment includes: average transmitted optical power;

[0103] 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;

[0104] The forward error correction code includes: at least two different forward error correction codes.

[0105] In one embodiment, the receiver sensitivity includes at least one of the following: sensitivity at a given bit error rate (BER), OMA sensitivity at a given bit error rate (BER);

[0106] 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.

[0107] 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.

[0108] In one embodiment, the access capability includes any one of the following: a value indicating the access capability, an identifier indicating the access capability.

[0109] 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:

[0110] If the transmission specification of the optical network terminal device is higher than the access capability, the optical network terminal device reduces its transmission optical power to meet the access capability;

[0111] If the transmission specification of the optical network terminal device is lower than the access capacity, the optical network terminal device increases its transmission optical power to meet the access capacity;

[0112] 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.

[0113] 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:

[0114] The optical network terminal device automatically performs an attenuation operation of the first preset power.

[0115] 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:

[0116] The optical network terminal device switches from a default 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;

[0117] The optical network terminal device uses a first high-gain FEC codeword, wherein a coding gain of the first high-gain FEC codeword is greater than coding gains of other FEC codewords.

[0118] In one embodiment, the transmission parameters include: the transmission optical power and forward error correction coding of the optical network terminal device;

[0119] 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:

[0120] The optical network terminal device automatically performs a first preset power attenuation operation;

[0121] If the optical signal power 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] It should be noted that for the explanation 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 the corresponding parameters in the above-mentioned communication method applied to the interaction between optical terminal equipment and optical network terminal equipment, and will not be repeated here.

[0126] In one embodiment, Figure 5 This is a flow chart of another communication method provided by an embodiment of the present application. This embodiment is applied to the case where multiple different access machine indicators are compatible. This embodiment can be executed by an optical network terminal device. Figure 5 As shown, this embodiment includes: S510-S520.

[0127] S510: Receive access capability sent by the optical central office device.

[0128] S520: Determine transmission parameters according to access capability.

[0129] In one embodiment, the transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

[0130] 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.

[0131] In one embodiment, the receiving capability of the optical central office device includes: receiver sensitivity;

[0132] The transmission capability of optical network terminal equipment includes: average transmitted optical power;

[0133] 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;

[0134] The forward error correction code includes: at least two different forward error correction codes.

[0135] In one embodiment, the receiver sensitivity includes at least one of the following: sensitivity at a given bit error rate (BER), OMA sensitivity at a given bit error rate (BER);

[0136] 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.

[0137] 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.

[0138] In one embodiment, the access capability includes any one of the following: a value indicating the access capability, an identifier indicating the access capability.

[0139] 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:

[0140] If the transmission specification of the optical network terminal device is higher than the access capability, the optical network terminal device reduces its transmission optical power to meet the access capability;

[0141] If the transmission specification of the optical network terminal device is lower than the access capacity, the optical network terminal device increases its transmission optical power to meet the access capacity;

[0142] 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.

[0143] 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:

[0144] The optical network terminal device automatically performs an attenuation operation of the first preset power.

[0145] 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:

[0146] The optical network terminal device switches from a default 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;

[0147] The optical network terminal device uses a first high-gain FEC codeword, wherein a coding gain of the first high-gain FEC codeword is greater than coding gains of other FEC codewords.

[0148] In one embodiment, the transmission parameters include: the transmission optical power and forward error correction coding of the optical network terminal device;

[0149] 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:

[0150] The optical network terminal device automatically performs a first preset power attenuation operation;

[0151] If the optical signal power 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] It should be noted that for the explanation 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 terminal equipment and optical network terminal equipment, and will not be repeated here.

[0156] 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.

[0157] Figure 6 This is a schematic diagram of the configuration of the OC body of a PSBd downlink physical synchronization block provided by an embodiment of the present application, such as Figure 6 As shown, a 3-bit ODN level is defined.

[0158] The operation control structure consists of a 51-bit operation control body (OC body) and a 13-bit HEC field, see Figure 6 The HEC field is composed of the BCH (63, 12, 2) code of the first 63 bits of the operation control structure and 1 parity bit.

[0159] The Operation Control Body has a specific format as described below and is filled in by the OLT CT based on explicitly specified data.

[0160] like Figure 6 As shown in the figure, when the downlink line speed is 49.7664 Gbit / s, the specific values ​​of the operation control entity are specified as follows:

[0161] 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:

[0162] RE flag (1 bit): Indicates whether the Transmitted Optical Level (TOL) field contains the transmit power of the OLT CT (RE=0) or the transmit power of the extender (RE=1);

[0163] ODN Class (3 bits): Identifies the transceiver optical interface parameters based on 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.

[0164] Downstream FEC flag (1 bit): Indicates whether FEC is enabled on the downstream side. When this bit is set to 1, FEC in the downstream direction is enabled. The value 0 is reserved;

[0165] P flag (1 bit): Protocol indication flag of TC layer protocol. When this bit is set to 1, the TC layer protocol will be used. The value 0 is reserved;

[0166] Link Type (2 bits): The optical link type as described in the applicable PMD standard.

[0167] b) PON-ID (32 bits, static, operator-assigned): identifies the OLT within a domain. The PON-ID consists of the following two fields:

[0168] 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.

[0169] 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.

[0170] c) R (1 bit): reserved for future use, set to 0;

[0171] 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 TDM system), and when C = 1, the following TOL value refers to the S / R-CP reference point;

[0172] 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.

[0173] 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.

[0174] Table 1 ODN optical path loss (OPL) classification and coding

[0175] Code Value ODN OPL type 000 N1 001 N2 010 E1 011 E2 100 C+ 101～111 reserve

[0176] In Table 1 above, each ODN level has a clear physical layer specification (PMD table) for the optical path loss range, which is used to define 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 currently defined for the two ODN levels N1 and C+. The code value 000 will correspond to two different ONU transmitter and OLT receiver specifications, N1 and N1b; the code value 100 will also correspond to two different ONU transmitter and OLT receiver specifications, C+ and C+b. Continuing to use the three bits of the OCbody in the existing standard for ODN OPL levels N1 and C+ will no longer distinguish which set of transceiver specifications are used.

[0177] Therefore, one feasible approach is to continue increasing 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, 101 may represent N1b, and 110 may represent C+b. Alternatively, instead of increasing the above code value, the reserved bits of the System_Profile PLOAM message may be redefined to distinguish between 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.

[0178] Table 2 System_Profile message format

[0179]

[0180]

[0181] The ONU connected to the PON system will obtain the ONU upstream Burst_Profile information through continuous configuration learning. The ONU responds to SNgrant through Serial_Number_ONU and provides an indication of the ONU's transmit power variable capability based on its own transmit and receive specifications and the variable transmit power capability.

[0182] 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):

[0183] Table 3 Serial_number_ONU message format

[0184]

[0185]

[0186]

[0187] 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):

[0188] (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:

[0189] 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 cause overload on the OLT's receiver, so the ONU needs to reduce its transmission power to meet the OLT's reception specification.

[0190] After the power is adjusted, the first four bits of the 38th byte corresponding to Serial_Number_ONU are AA=10 and BB=01.

[0191] The meaning of AABB is as follows:

[0192] AA indicates the ability to adjust the transmit power of the ONU transmitter. AA = 00 means the current ONU transmit power cannot be adjusted; AA = 01 means the current ONU transmit power can be increased to meet a higher transmit power specification for the same ODN level; AA = 10 means the current ONU transmit power can be reduced to meet a lower transmit power specification for the same ODN level.

[0193] BB indicates the adjustment result of the ONU's own ONU transmit power when responding to the SN grant phase;

[0194] Among them: BB=00: the transmission benchmark has not been adjusted; BB=01, it means that the current ONU transmission benchmark has been reduced; BB=10, it means that the current ONU transmission benchmark has been increased.

[0195] 2) The ONU's transmission specification is lower than the ONU's transmission capability indicated by the OLT. In this case, the uplink signal transmitted by the ONU may not be received correctly by the OLT. Therefore, the ONU may need to increase its transmission power to meet the OLT's reception specification.

[0196] The meaning of AABB is the same as 1). After power adjustment, the first four bits of the 38th byte corresponding to Serial_Number_ONU are AA=01 and BB=10.

[0197] 3) 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. Even in this case, the optical signal transmitted by the ONU according to its own transmission specification may still meet the dynamic range requirements of the OLT receiver at the optical power received at the OLT;

[0198] Therefore, although the transmission specification may not meet the requirements, the OLT can still receive the upstream ONU data normally on the receiving side. At this time, the first four bits of the 38th byte corresponding to Serial_Number_ONU are AA=00, BB=00.

[0199] 4) The ONU's transmission specification does not match the ONU's transmission capability indicated by the OLT, and the ONU cannot adjust its transmit 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 fail to receive correctly.

[0200] This situation is the same as 3) and corresponds to the first 4 bits of the 38th byte of Serial_Number_ONU: AA=00, BB=00.

[0201] (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.

[0202] The OLT further configures the upstream transmission parameters of the ONU.

[0203] 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 adjusts the upstream optical power, in most cases the OLT can normally detect the ONU's online request and analyze the optical power adjustment capability reported by the ONU to understand the status of the currently connected ONU. It then performs subsequent configuration. 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 specifications of the online ONU are consistent with the current PON system. And by analyzing the first four 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 detects that the ONU has responded normally, the subsequent activation and registration process is the same as G.9804.2.

[0204] 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.

[0205] 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).

[0206] Table 4 Burst configuration message format

[0207]

[0208]

[0209]

[0210]

[0211] 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.

[0212] Example 1

[0213] The ONU workflow when the ONU transmission specification does not match the OLT's receiving capability and the ONU's transmit optical power is adjustable includes two cases: the ONU transmission specification is higher than the ONU transmission capability indicated by the OLT, and the ONU transmission specification is lower than the OLT transmission capability indicated by the OLT. The steps are as follows:

[0214] Step 1: The OLT broadcasts the upstream burst configuration information required for ONUs to go online, as well as the quiet window during which newly online 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 serial number grant (SNgrant).

[0215] Step 2: 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.

[0216] Step 3: 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.

[0217] The adjustment method is as follows:

[0218] 1) The ONU's transmission specification is higher than the ONU's transmission capability indicated by the OLT. The ONU reduces its transmit optical power to meet the OLT's receiving capability or the ONU's transmission capability indicated by the OLT.

[0219] 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.

[0220] After the ONU completes the transmit optical power adjustment, it needs to send a Serial_Number_ONU response message to the OLT during the quiet window specified by the OLT.

[0221] Step 4: After the OLT receives the Serial_Number_ONU message from the ONU, it will further assign an ONU-ID and Alloc-ID 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 steps are the same as the current standard and are not repeated here.

[0222] Optionally, in this embodiment, the ONU may also report to the OLT information such as its transmit power adjustability (hereinafter 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 state. This is not limited in this embodiment.

[0223] Example 2

[0224] 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.

[0225] After the ONU is connected to the PON system, the ONU with low transmission specification directly sends upstream data to the OLT, and the OLT can receive it normally. 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 existing standard, and this is not repeated.

[0226] Example 3

[0227] The ONU workflow is performed when the ONU transmission specification exceeds the OLT receiving capability and the ONU can only transmit optical power within its own transmission specification. It includes the following steps:

[0228] Step 1: The OLT broadcasts the upstream burst configuration information required for ONUs to go online, as well as the quiet window during which newly online 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 serial number grant (SNgrant).

[0229] Step 2: 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.

[0230] Step 3: 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.

[0231] In this embodiment, although the ONU can only transmit optical power within its own transmission specifications, it supports transmission with attenuated optical power, 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.

[0232] Step 4: 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 steps are the same as the current standard and are not repeated here;

[0233] Optionally, in this embodiment, the ONU may also report to the OLT information such as its transmit optical power adjustability (hereinafter 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 may report this information or the OLT may update the ONU's Burst_Profile after the ONU enters normal operation. This is not limited in this embodiment.

[0234] Example 4

[0235] 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.

[0236] In this embodiment, after an ONU is connected to a PON system, an ONU with a low transmission specification directly sends upstream data to an OLT, but the OLT cannot normally receive the data. For example, the BER output by the receiving end is higher than the BER corresponding to the sensitivity specification of the OLT receiver.

[0237] The steps include:

[0238] Step 1: The OLT broadcasts the upstream burst configuration information required for ONUs to go online, as well as the quiet window during which newly online 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 serial number grant (SNgrant).

[0239] Step 2: 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.

[0240] Step 3: 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.

[0241] In step 4, 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 must be higher than that of the original FEC codeword. The notification method of the FEC codeword includes: specifying the 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.

[0242] Step 5: 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 in the quiet window specified by the OLT.

[0243] In step 6, 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 steps are the same as the current standard and are not repeated here.

[0244] Optionally, in steps 3 and 5 of this embodiment, the ONU may also report to the OLT information such as its transmit power adjustability (hereinafter 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 may report this information or the OLT may update the ONU's Burst_Profile after the ONU enters normal operation. This is not limited in this embodiment.

[0245] Example 5

[0246] 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 FECs that can be switched online. The ONU workflow includes the following steps:

[0247] Step 1: The OLT broadcasts the upstream burst configuration information required for ONUs to go online, as well as the quiet window during which newly online 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 serial number grant (SNgrant).

[0248] Step 2: 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.

[0249] Step 3: 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.

[0250] 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.

[0251] In step 4, 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 must be higher than that of the original FEC codeword. The notification method of the FEC codeword includes: specifying the 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.

[0252] Step 5: 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 in the quiet window specified by the OLT.

[0253] In step 6, 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 steps are the same as the current standard and are not repeated here.

[0254] Optionally, in this embodiment, in steps 3 and 5, the ONU may also report to the OLT information such as its transmit power adjustability (hereinafter 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 may report this information or the OLT may update the ONU's Burst_Profile after the ONU enters normal operation. This is not limited in this embodiment.

[0255] 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.

[0256] In one embodiment, Figure 7 This is a structural block diagram of a communication device provided by an embodiment of the present application. This embodiment is applied to optical central office equipment and optical network terminal equipment. Figure 7 As shown, the communication device in this embodiment includes: a transmitter 710 and a determination module 720.

[0257] The transmitter 710 is configured as an optical central office device to send access capabilities to an optical network terminal device.

[0258] The determination module 720 is configured to determine the transmission parameters of the optical network terminal device according to the access capability.

[0259] In one embodiment, the transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

[0260] 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.

[0261] In one embodiment, the receiving capability of the optical central office device includes: receiver sensitivity;

[0262] The transmission capability of optical network terminal equipment includes: average transmitted optical power;

[0263] 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;

[0264] The forward error correction code includes: at least two different forward error correction codes.

[0265] In one embodiment, the receiver sensitivity includes at least one of the following: sensitivity at a given bit error rate (BER), OMA sensitivity at a given bit error rate (BER);

[0266] 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.

[0267] 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.

[0268] In one embodiment, the access capability includes any one of the following: a value indicating the access capability, an identifier indicating the access capability.

[0269] 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:

[0270] If the transmission specification of the optical network terminal device is higher than the access capability, the optical network terminal device reduces its transmission optical power to meet the access capability;

[0271] If the transmission specification of the optical network terminal device is lower than the access capacity, the optical network terminal device increases its transmission optical power to meet the access capacity;

[0272] 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.

[0273] In one embodiment, the transmission specification of the optical network terminal device includes: average transmitted optical power;

[0274] 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.

[0275] 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:

[0276] The optical network terminal device automatically performs an attenuation operation of the first preset power.

[0277] 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:

[0278] The optical network terminal device switches from a default 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;

[0279] The optical network terminal device uses a first high-gain FEC codeword, wherein a coding gain of the first high-gain FEC codeword is greater than coding gains of other FEC codewords.

[0280] In one embodiment, the transmission parameters include: the transmission optical power and forward error correction coding of the optical network terminal device;

[0281] 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:

[0282] The optical network terminal device automatically performs a first preset power attenuation operation;

[0283] If the optical signal power 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.

[0284] 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.

[0285] 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.

[0286] In one embodiment, the transmit power adjustment capability and transmit power adjustment status are carried in a sequence number message.

[0287] 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.

[0288] The communication device provided in this embodiment is configured to implement Figure 3 The communication method applied to the optical central office equipment and the optical network terminal equipment in the illustrated embodiment is similar to the implementation principle and technical effect of the communication device provided in this embodiment, and will not be repeated here.

[0289] In one embodiment, Figure 8 This is a structural block diagram of another communication device provided by an embodiment of the present application. This embodiment is applied to optical terminal equipment. Figure 8 As shown, the communication device in this embodiment includes: a transmitter 810.

[0290] 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.

[0291] In one embodiment, the transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

[0292] 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.

[0293] In one embodiment, the receiving capability of the optical central office device includes: receiver sensitivity;

[0294] The transmission capability of optical network terminal equipment includes: average transmitted optical power;

[0295] 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;

[0296] The forward error correction code includes: at least two different forward error correction codes.

[0297] In one embodiment, the receiver sensitivity includes at least one of the following: sensitivity at a given bit error rate (BER), OMA sensitivity at a given bit error rate (BER);

[0298] 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.

[0299] 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.

[0300] In one embodiment, the access capability includes any one of the following: a value indicating the access capability, an identifier indicating the access capability.

[0301] 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:

[0302] If the transmission specification of the optical network terminal device is higher than the access capability, the optical network terminal device reduces its transmission optical power to meet the access capability;

[0303] If the transmission specification of the optical network terminal device is lower than the access capacity, the optical network terminal device increases its transmission optical power to meet the access capacity;

[0304] 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.

[0305] In one embodiment, the transmission specification of the optical network terminal device includes: average transmitted optical power;

[0306] 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.

[0307] 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:

[0308] The optical network terminal device automatically performs an attenuation operation of the first preset power.

[0309] 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:

[0310] The optical network terminal device switches from a default 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;

[0311] The optical network terminal device uses a first high-gain FEC codeword, wherein a coding gain of the first high-gain FEC codeword is greater than coding gains of other FEC codewords.

[0312] In one embodiment, the transmission parameters include: the transmission optical power and forward error correction coding of the optical network terminal device;

[0313] 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:

[0314] The optical network terminal device automatically performs a first preset power attenuation operation;

[0315] If the optical signal power 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.

[0316] 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.

[0317] In one embodiment, the communication device applied to the optical central office equipment further includes:

[0318] 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.

[0319] In one embodiment, the communication device applied to the optical central office equipment further includes:

[0320] 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.

[0321] The communication device provided in this embodiment is configured to implement Figure 4 The communication method applied to the optical central office device in the illustrated embodiment is similar to the implementation principle and technical effect of the communication device provided in this embodiment, and will not be described in detail here.

[0322] In one embodiment, Figure 9 This is a structural block diagram of another communication device provided by the embodiment of the present application. This embodiment is applied to optical network terminal equipment. Figure 9 As shown, the communication device in this embodiment includes: a receiver 910 and a determination module 920.

[0323] The receiver 910 is configured to receive the access capability sent by the optical central office device.

[0324] The determination module 920 is configured to determine the transmission parameters according to the access capability.

[0325] In one embodiment, the transmission parameters include at least one of the following: transmission optical power; forward error correction coding.

[0326] 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.

[0327] In one embodiment, the receiving capability of the optical central office device includes: receiver sensitivity;

[0328] The transmission capability of optical network terminal equipment includes: average transmitted optical power;

[0329] 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;

[0330] The forward error correction code includes: at least two different forward error correction codes.

[0331] In one embodiment, the receiver sensitivity includes at least one of the following: sensitivity at a given bit error rate (BER), OMA sensitivity at a given bit error rate (BER);

[0332] 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.

[0333] 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.

[0334] In one embodiment, the access capability includes any one of the following: a value indicating the access capability, an identifier indicating the access capability.

[0335] 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:

[0336] If the transmission specification of the optical network terminal device is higher than the access capability, the optical network terminal device reduces its transmission optical power to meet the access capability;

[0337] If the transmission specification of the optical network terminal device is lower than the access capacity, the optical network terminal device increases its transmission optical power to meet the access capacity;

[0338] 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.

[0339] In one embodiment, the transmission specification of the optical network terminal device includes: average transmitted optical power;

[0340] 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.

[0341] 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:

[0342] The optical network terminal device automatically performs an attenuation operation of the first preset power.

[0343] 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:

[0344] The optical network terminal device switches from a default 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;

[0345] The optical network terminal device uses a first high-gain FEC codeword, wherein a coding gain of the first high-gain FEC codeword is greater than coding gains of other FEC codewords.

[0346] In one embodiment, the transmission parameters include: the transmission optical power and forward error correction coding of the optical network terminal device;

[0347] 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:

[0348] The optical network terminal device automatically performs a first preset power attenuation operation;

[0349] If the optical signal power 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.

[0350] 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.

[0351] In one embodiment, the communication device applied to the optical network terminal equipment further includes:

[0352] 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.

[0353] In one embodiment, the communication device applied to the optical network terminal equipment further includes:

[0354] 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.

[0355] The communication device provided in this embodiment is configured to implement Figure 5 The communication method applied to the optical network terminal equipment in the illustrated embodiment is similar to the implementation principle and technical effect of the communication device provided in this embodiment, and will not be described in detail here.

[0356] In one embodiment, Figure 10 This is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. Figure 10 As shown, the device provided by this 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. Figure 10 In the example, a processor 1010 is used. The number of memories 1020 in the device can be one or more. Figure 10 In the example, a memory 1020 is used. The processor 1010, memory 1020 and communication module 1030 of the device can be connected via a bus or other means. Figure 10 In the embodiment, the device may be an optical central office device or an optical network terminal device.

[0357] 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.

[0358] 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.

[0359] 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.

[0360] 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.

[0361] 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.

[0362] 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.

[0363] 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.

[0364] 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.

[0365] 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.

[0366] The block diagram of any logical flow in the drawings of the present application may represent program steps, or may represent interconnected logical circuits, modules and functions, or may represent a combination of program steps and logical 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, a read-only memory (ROM), a random access memory (RAM), an optical storage device and system (a digital versatile disc (DVD) or a compact disk (CD)). 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.

[0367] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A communication method, characterized in that: Before the optical network terminal equipment is assigned an optical network terminal equipment identifier, the following steps are required: The optical central office equipment sends access capabilities to the optical network terminal equipment; The optical network terminal equipment determines transmission parameters according to the access capability.

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

3. The method according to claim 1, characterized in that 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.

4. The method according to claim 3, characterized in that 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 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; The forward error correction code includes: at least two different forward error correction codes.

5. The method according to claim 4, characterized in that The receiver sensitivity includes at least one of the following: sensitivity under a given bit error rate BER, OMA sensitivity under 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.

6. The method according to claim 1, characterized in that 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, characterized in that The access capability includes any one of the following: a value indicating the access capability, an identifier indicating the access capability.

8. The method according to claim 1, characterized in that 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: 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 transmission 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.

9. The method according to claim 8, characterized in that 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, characterized in that 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 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; 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: The optical network terminal device switches from a default 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, characterized in that The transmission parameters include: the transmission optical power and forward error correction coding of the optical network terminal equipment; 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: The optical network terminal device automatically performs a first preset power attenuation operation; If the optical signal power 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.

13. The method according to claim 11 or 12, characterized in that 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, characterized in that The method further comprises: 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, characterized in that 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, characterized in that The method further comprises: 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, characterized in that: Applied to an optical central office device, before the optical central office device allocates an optical network terminal device identifier, the method includes: 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, characterized in that 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: 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 transmission 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.

21. The method according to claim 17, wherein 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 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; 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: The optical network terminal device switches from a default 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.

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; 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: The optical network terminal device automatically performs a first preset power attenuation operation; If the optical signal power 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.

24. The method according to claim 22 or 23, characterized in that 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, characterized in that The method further comprises: 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, characterized in that The method further comprises: 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, characterized in that: Applied to an optical network terminal device, before an optical central office device allocates an optical network terminal device identifier to the optical network terminal device, the method comprises: Access capability of receiving data sent by optical central office equipment; Transmission parameters are determined according to the access capability.

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

29. The method according to claim 27, characterized in that 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 according to claim 27, wherein The transmission parameters include: the transmission power rate of the optical network terminal device; the determination of the transmission parameters according to the access capability includes one of the following: 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 transmission 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.

31. The method according to claim 27, wherein 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 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 according to claim 27, wherein 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: The optical network terminal device switches from a default 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.

33. The method according to claim 27, wherein The transmission parameters include: the transmission optical power and forward error correction coding of the optical network terminal equipment; 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, determining the transmission parameters according to the access capability includes: The optical network terminal device automatically performs a first preset power attenuation operation; If the optical signal power 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.

34. The method according to claim 32 or 33, characterized in that 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, characterized in that The method further comprises: 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, characterized in that The method further comprises: 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, characterized in that: include: 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 method according to any one of claims 1 to 16, 17 to 26, or 27 to 36.

38. A storage medium, characterized in that The storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 16, 17 to 26, or 27 to 36 is implemented.

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