CN112771796A

CN112771796A - Method and device for distributing uplink luminous time slots of optical network equipment

Info

Publication number: CN112771796A
Application number: CN201880098177.6A
Authority: CN
Inventors: 曾小飞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-09-29
Filing date: 2018-09-29
Publication date: 2021-05-07
Anticipated expiration: 2038-09-29
Also published as: WO2020062162A1; CN112771796B

Abstract

A method and a device for allocating an uplink light-emitting time slot of optical network equipment are used for solving the problems of high adjustment complexity and high cost of adjusting the emission power of an optical network unit in the prior art. In this embodiment of the present application, the order in which each ONT sends the uplink optical signal is determined by comparing the optical power of the uplink optical signal sent by each ONT reaching the OLT, so that the time when the ONT with the higher optical power sends the optical signal is later than the time when the OTN with the lower optical power sends the optical signal.

Description

Method and device for distributing uplink luminous time slots of optical network equipment

Technical Field

The present application relates to the field of optical communications technologies, and in particular, to a method and an apparatus for allocating uplink light-emitting timeslots to optical network devices.

Background

In a Time Division Multiplexing (TDM) Passive Optical Network (PON) system, different optical network devices, such as Optical Network Terminals (ONTs) or Optical Network Units (ONUs), transmit uplink optical signals at different time slots under the control of an Optical Line Terminal (OLT).

The order in which each ONT transmits the uplink optical signal is generally determined by the on-line sequence of each ONT in the system or by the order in which the manually set ONT transmits the uplink optical signal.

Usually, the difference of the optical power emitted by each ONT is relatively small, but because the distance, the connector, the connection quality and the like between different ONTs and the OLT cause different transmission links, the optical attenuations of the optical signals sent by different ONTs reaching the OLT are also different, and further, the optical power of the uplink optical signals sent by each ONT reaching the OLT is also different.

However, when optical signals transmitted by two ONTs sequentially adjacent to each other in the optical signal transmission sequence reach the OLT, if the optical power P1 of the optical signal transmitted by the front ONT reaching the OLT is much larger than the optical power P2 of the optical signal transmitted by the rear ONT reaching the OLT, that is, P1 is much larger than P2, the optical signal transmitted by the front ONT received by the OLT affects the received optical signal transmitted by the rear ONT, which may generate an error or cause a packet loss.

In the prior art, a mode of dynamically adjusting the optical power of each ONT is generally adopted, so that the difference between the optical powers of uplink optical signals sent by each ONT and arriving at the OLT is small. The method for dynamically adjusting the optical power of each ONT needs to adjust the optical power of each ONT, and the adjustment is complex and the cost is high.

Disclosure of Invention

The embodiment of the application provides a method and a device for allocating an uplink light-emitting time slot to optical network equipment, which are used for solving the problems of high adjustment complexity and high cost when the power of the emitted light of each ONT is adjusted in the prior art.

In a first aspect, an embodiment of the present application provides a method for allocating an uplink light-emitting timeslot to an optical network device, including:

the optical line terminal OLT acquires optical power corresponding to a plurality of optical network devices respectively. The optical power corresponding to the first optical network device is the power of the OLT receiving the optical signal sent by the first optical network device, or the power of the first optical network device receiving the optical signal sent by the OLT, where the first optical network device is one of the plurality of optical network devices. The optical network equipment may be an optical network terminal ONT or an optical network unit ONU. The OLT obtains the power of the optical signal sent by the OLT, which may be that after the first optical network device determines to receive the power of the optical signal sent by the OLT, the OLT is notified of the power.

After the OLT acquires the optical power respectively corresponding to the plurality of optical network devices, the OLT allocates uplink light-emitting time slots for the plurality of optical network devices to send uplink optical signals in a Dynamic Bandwidth Allocation (DBA) period according to the optical power respectively corresponding to the plurality of optical network devices;

wherein, an uplink light-emitting time slot of a jth optical network device in the plurality of optical network devices for sending an uplink optical signal is earlier than an uplink light-emitting time slot of a jth +1 optical network device for sending an uplink optical signal, and an optical power corresponding to the jth optical network device is smaller than an optical power corresponding to the jth +1 optical network device, a value of j is an integer smaller than n, and n is equal to the number of optical network devices communicating with the OLT. Or, the plurality of optical network devices may be divided into M groups, where one group includes at least one optical network device, an uplink light-emitting time slot, during which any optical network device included in the ith group sends an uplink optical signal, is earlier than an uplink light-emitting time slot, during which any optical network device included in the (i + 1) th group sends an uplink optical signal, an optical power corresponding to any optical network device included in the ith group is smaller than an optical power corresponding to any optical network device included in the (i + 1) th group, M is an integer greater than 1, and a value of i is an integer smaller than M.

In this embodiment of the present application, the order in which each ONT sends the uplink optical signal is determined by comparing the optical power of the uplink optical signal sent by each ONT reaching the OLT, so that the time when the ONT with the higher optical power sends the optical signal is later than the time when the OTN with the lower optical power sends the optical signal. And further, the ONT with higher optical power is prevented from being sent before the OTN with lower optical power, and the influence on the receiving of the optical signal sent by the OTN with lower optical power is avoided. Or grouping the ONTs, so that the optical powers belonging to the same group have smaller differences, and optical signals among the ONTs of the same group are not affected basically, and determining the order in which the groups send the uplink optical signals based on the grouping result, so that the time when the ONTs with higher optical power send the optical signals is later than the time when the OTNs with lower optical power send the optical signals, thereby avoiding that the ONTs with higher optical power send before the OTNs with lower optical power and affect the reception of the optical signals sent by the OTNs with lower optical power.

In one possible design, the DBA period includes a guard time interval, and the guard time interval is located after an uplink light-emitting time slot allocated to a last optical network device that transmits an uplink optical signal or before an uplink light-emitting time slot allocated to a first optical network device that transmits an uplink optical signal. Through the design, the situation that the optical signal with larger front optical power influences the optical signal with smaller rear optical power at the upstream period junction of the front DBA and the rear DBA can be avoided, and the optical signal receiving quality is improved.

In a second aspect, the present application provides an apparatus, which may be an OLT, or other apparatuses capable of supporting the OLT to implement the method, for example, an apparatus in the OLT, which includes an obtaining module and an adjusting module, where the obtaining module and the adjusting module may perform corresponding functions of the OLT in the first aspect or any design example of the first aspect, and the OLT may communicate with multiple optical network devices. The optical network device is an optical network terminal ONT or an optical network unit ONU, specifically:

an obtaining module, configured to obtain optical powers corresponding to the multiple optical network devices, respectively, where the optical power corresponding to a first optical network device is a power of an optical signal sent by the first optical network device received by the OLT, or is a power of an optical signal sent by the OLT received by the first optical network device, and the first optical network device is one of the multiple optical network devices;

and the adjusting module is used for allocating uplink light-emitting time slots for the plurality of optical network devices to send uplink optical signals in a Dynamic Bandwidth Allocation (DBA) period according to the optical powers respectively corresponding to the plurality of optical network devices.

In a possible design, a time when a jth optical network device among the plurality of optical network devices sends an uplink optical signal is earlier than a time when a j +1 th optical network device sends the uplink optical signal, optical power corresponding to the jth optical network device is smaller than optical power corresponding to the j +1 th optical network device, j is an integer smaller than n, and n is equal to the number of optical network devices communicating with the OLT.

In another possible design, the plurality of optical network devices are divided into M groups, one group includes at least one optical network device, a time when any optical network device included in the ith group sends an uplink optical signal is earlier than a time when any optical network device included in the (i + 1) th group sends an uplink optical signal, an optical power corresponding to any optical network device included in the ith group is smaller than an optical power corresponding to any optical network device included in the (i + 1) th group, M is an integer greater than 1, and i takes a value of an integer smaller than M.

For example, the DBA period may include a guard time interval, and the guard time interval may be located after the uplink light-emitting time slot allocated to the last optical network device that sends the uplink optical signal, or may be located before the uplink light-emitting time slot allocated to the first optical network device that sends the uplink optical signal.

In a third aspect, an embodiment of the present application further provides an apparatus, which may be an OLT, configured to implement the method described in the first aspect; the apparatus may also be other apparatuses capable of supporting the OLT to implement the method described in the first aspect, for example, an apparatus that may be disposed in the OLT. The OLT may be a chip system, a module, a circuit, or the like provided therein, which is not particularly limited in this application. The apparatus comprises a processor configured to implement the function of the OLT in the method described in the first aspect. The apparatus may also include a memory for storing program instructions and data. The memory is coupled to the processor, and the processor invokes and executes the program instructions stored in the memory, so as to implement the function of the OLT in the method described in the first aspect. The apparatus may also include a communication interface for the apparatus to communicate with other devices. Illustratively, the other device is an ONT or an ONU. In the embodiments of the present application, the communication interface may include a circuit, a bus, an interface, a communication interface, or any other device capable of implementing a communication function.

In a fourth aspect, this embodiment of the present application further provides a computer storage medium, where a software program is stored, and the software program can implement the method according to the first aspect or any design of the first aspect when being read and executed by one or more processors.

In a fifth aspect, embodiments of the present application provide a computer program product comprising instructions that, when executed on a computer, cause the computer to perform the method of the first aspect or any design of the first aspect.

In a sixth aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor and may further include a memory, and is configured to implement a function of the OLT in the foregoing method. The chip system may be formed by a chip, and may also include a chip and other discrete devices.

In a seventh aspect, an embodiment of the present application provides a system, where the system includes an OLT and multiple ONTs (or ONUs). In one aspect, the ONT is configured to send an optical signal to the OLT, and the OLT is configured to receive the optical signal and perform the method according to the first aspect or any design of the first aspect based on the optical signal. On the other hand, the OLT transmits optical signals to a plurality of ONTs, respectively, and each ONT determines the optical power of the received optical signal and notifies the OLT, so that the OLT performs the method of the first aspect or any design of the first aspect based on the optical power of each ONT.

Drawings

Fig. 1 is a schematic diagram of an optical communication system according to an embodiment of the present application;

fig. 2 is a schematic flowchart of a method for allocating an uplink light-emitting timeslot to an optical network device according to an embodiment of the present disclosure;

fig. 3 is a schematic sequence diagram of sending uplink optical signals corresponding to different ONT optical powers in a DBA period according to an embodiment of the present application;

fig. 4A and fig. 4B are schematic diagrams of a guard interval according to an embodiment of the present application;

fig. 5 is a schematic sequence diagram of sending uplink optical signals corresponding to different ONT optical powers in another DBA period according to the embodiment of the present application;

fig. 6A and fig. 6B are schematic diagrams of a guard interval according to an embodiment of the present application;

FIG. 7 is a schematic diagram of an apparatus 700 according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of an OLT800 according to an embodiment of the present application.

Detailed Description

The embodiment of the invention can be applied to an optical communication system, and the optical communication system can be a TDM PON system. The TDM PON system may be a gigabit-passive optical network (GPON) system, an ethernet passive optical network (ethernet PON, EPON) system, a 10G ethernet passive optical network (10Gb/s ethernet passive optical network, 10G-EPON) system, a 10G gigabit-passive optical network (10 XG-PON) system, or a 10G gigabit-symmetric passive optical network (10 Gb-capacitive passive optical network, XGs-PON) system, etc.

The optical communication system at least comprises an OLT and a plurality of ONTs, wherein the OLT is respectively communicated with the plurality of ONTs. In this embodiment of the present application, the optical communication system may also include an OLT and a plurality of ONUs, where the OLT communicates with the plurality of ONUs respectively, which is not specifically limited in this embodiment, and the following description takes the ONT as an example. Referring to FIG. 1, an OLT communicates with n ONTs through optical splitters. In fig. 1, n ONTs are ONT1, ONTs 2, … …, and ONTn, respectively.

At present, the order in which each ONT sends an uplink optical signal is usually determined by the uplink sequence of each ONT in the system or manually set order in which the ONT sends the uplink optical signal, that is, in a Dynamic Bandwidth Allocation (DBA) period, the time sequence corresponding to the time slot allocated to each ONT by the OLT is the uplink sequence of the ONT or the manually configured order in which the ONT sends the uplink optical signal. The difference of the optical power emitted by each ONT is relatively small, but because the distance, the connector, the connection quality and the like between different ONTs and the OLT cause different transmission links, the optical attenuations of optical signals sent by different ONTs reaching the OLT are also different, and further, the optical power of uplink optical signals sent by each ONT reaching the OLT is also different.

When the upstream optical signals transmitted by two ONTs adjacent in sequence for transmitting optical signals reach the OLT, if the optical power P1 of the upstream optical signal transmitted by the front ONT reaching the OLT is less than the optical power P2 of the optical signal transmitted by the rear ONT reaching the OLT, i.e., P1< P2; or the optical power P1 of the optical signal sent by the front ONT reaching the OLT is slightly larger than the optical power P2 of the optical signal sent by the rear ONT reaching the OLT, i.e. P1-P2< power threshold, which is an empirical value that the signal sent by the front ONT received by the OLT does not affect the reception of the optical signal of the rear ONT, in both cases, the sent optical signal is not substantially affected.

However, if the optical power P1 of the uplink optical signal sent by the front ONT reaching the OLT is much greater than the optical power P2 of the uplink optical signal sent by the rear ONT reaching the OLT, that is, P1 is much greater than P2, the uplink optical signal sent by the front ONT received by the OLT may affect the received optical signal sent by the rear ONT, and when the uplink optical signal sent by the rear ONT is received, the OLT performs discharge processing on the optical power of the front received ONT, so when the optical power of the uplink optical signal of the front received ONT is higher, the discharge time is longer, the influence on the received optical signal with lower optical power of the rear ONT is greater, and an error may be generated or a packet may be lost.

Taking fig. 1 as an example, the optical power of the uplink optical signal sent by ONT1 reaching the OLT is P1, the optical power of the uplink optical signal sent by ONT2 reaching the OLT is P2, and the optical power of the uplink optical signal sent by ONT3 reaching the OLT is P3. The order of sending uplink optical signals by the ONT1, the ONT2 and the ONT3 is ONT1, ONT2, ONT3, P1< P2, P2> P3. The uplink optical signal of ONT1 received by the OLT does not affect the reception of the uplink optical signal of ONT2 by the OLT, and since P2> P3 and P2 and P3 are different greatly, the uplink optical signal of ONT1 received by the OLT affects the reception of the uplink optical signal of ONT2 by the OLT.

In order to solve the above problem, a method of dynamically adjusting the transmission optical power of each ONT is generally adopted in the prior art, so that the adjusted optical power of the optical signal sent by each ONT reaching the OLT is equivalent. One way is to configure an optical power range for each ONT in advance, and the ONT adjusts the emitted optical power according to the received optical power of the optical signal sent by the OLT, for example, the received optical power is located outside the optical power range and is smaller than the minimum optical power in the optical power range, which means that the insertion loss corresponding to the ONT is larger, and the ONT can adjust the emitted optical power larger, and vice versa. The other way is that the OLT tests the actual optical power of the optical signal sent by each ONT reaching the OLT, and if the optical power of the optical signal sent by a certain ONT reaching the OLT is found to be outside the optical power range and is smaller than the minimum optical power in the optical power range, an instruction may be sent to the ONT to instruct the ONT to increase the transmitting optical power; if a large is found, an instruction may be sent to the ONT instructing the ONT to reduce the emitted optical power. This kind of mode of dynamic adjustment each ONT's emitted light power size needs to adjust to a plurality of ONTs, may need adjustment many times, and the complexity is higher, and the cost is higher adjusting.

Based on this, embodiments of the present application provide a method and an apparatus for allocating an uplink light-emitting timeslot to an optical network device, so as to solve the problems of high adjustment complexity and high cost in the prior art. In this embodiment of the present application, the order in which each ONT sends the uplink optical signal is determined by comparing the optical power of the uplink optical signal sent by each ONT reaching the OLT, so that the time when the ONT with the higher optical power sends the optical signal is later than the time when the OTN with the lower optical power sends the optical signal. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

The plurality of the present application means two or more. In addition, it is to be understood that the terms first, second, etc. in the description of the present application are used for distinguishing between the descriptions and not necessarily for describing a sequential or chronological order.

The following provides a detailed description of the scheme provided in the examples of the present application.

Referring to fig. 2, a schematic flowchart of a method for allocating an uplink light-emitting timeslot to an optical network device according to an embodiment of the present application is shown. Take the case where the OLT communicates with n ONTs.

S201, the OLT acquires optical power corresponding to the n ONTs respectively. And the optical power corresponding to the jth ONT is the received optical power of the OLT communicating with the jth ONT. j is an integer less than n.

For example, the received optical power of the OLT communicating with the jth ONT may be the power of the OLT receiving an optical signal sent by the jth ONT, or may be the power of the jth ONT receiving an optical signal sent by the OLT.

Further, the OLT acquires optical powers corresponding to the n ONTs, and may be implemented as follows:

the first method is as follows:

and the OLT measures the optical power of the received optical signals respectively sent by the n ONTs.

The second method comprises the following steps:

and the OLT receives the optical power of the optical signal sent by the OLT and received by each ONT fed back by the n ONTs. Illustratively, the jth ONT measures the optical power of the received optical signal sent by the OLT and feeds back the measured optical power to the OLT.

S202, the OLT allocates, to the plurality of ONTs, uplink light-emitting timeslots for sending uplink optical signals in the DBA period according to optical powers corresponding to the n ONTs, respectively.

After the OLT allocates the uplink light-emitting time slots to the n ONTs, the OLT notifies the n ONTs of the uplink light-emitting time slots, so that the ONTs send uplink optical signals to the OLT based on the uplink light-emitting time slots allocated by the OLT.

In a possible implementation manner, the OLT allocates, to the plurality of ONTs, uplink light-emitting time slots for sending the uplink optical signal in the DBA period according to optical powers corresponding to the n ONTs, where the OLT may allocate, to the plurality of ONTs, the uplink light-emitting time slots for sending the uplink optical signal in the DBA period according to a size arrangement order of the optical powers corresponding to the n ONTs, respectively.

The time when the jth ONT of the n ONTs sends the uplink optical signal is earlier than the time when the j +1 th ONT sends the uplink optical signal, the optical power corresponding to the jth ONT is smaller than the optical power corresponding to the j +1 th ONT, and the value of j is an integer smaller than n.

In addition, a time when the jth ONT of the n ONTs sends the uplink optical signal is earlier than a time when the j +1 th ONT sends the uplink optical signal, which may be described as an uplink light-emitting timeslot when the jth ONT of the n ONTs sends the uplink optical signal is earlier than an uplink light-emitting timeslot when the j +1 th ONT sends the uplink optical signal.

For example, taking 4 ONTs as an example, the received optical powers of the 4 ONTs are arranged in sequence, as shown in fig. 3. In fig. 3, the height of the rectangular box indicates the corresponding received optical power of each ONT, i.e., ONT3< ONT1< ONT 4< ONT 2.

Based on this, the OLT allocates the time sequence of the upstream light-emitting timeslots for the 4 ONTs, see fig. 3.

In addition, in order to avoid the influence of the optical signal with higher front optical power on the optical signal with lower rear optical power at the boundary between the front and rear DBA uplink periods, a guard time interval may be configured in the DBA period. The guard time interval may be located at the end of the DBA period, i.e. after the uplink light-emitting timeslot allocated for the last OTN sending the uplink optical signal. The guard time interval may also be located at the head of the DBA period, that is, may also be located before the uplink light-emitting timeslot allocated to the first ONT transmitting the uplink optical signal. Taking the time sequence of the uplink light-emitting timeslots allocated to 4 ONTs shown in fig. 3 as an example, when the protection time interval is located at the tail of the DBA cycle, as shown in fig. 4A, the protection time interval is located after the uplink light-emitting timeslot allocated to the ONT2 that sends the uplink optical signal at the latest in the DBA cycle. If the guard interval is at the head of the DBA period, see fig. 4B, the guard interval is located before the upstream optical time slot allocated to the ONT3 that sent the upstream optical signal earliest in the DBA period.

No ONT is assigned to transmit upstream optical signals during the guard time interval. Therefore, the OLT can realize the switching and adjustment from the optical signal with larger optical power to the optical signal with smaller optical power in the protection time interval, thereby avoiding the influence of the optical signal with larger optical power in front on the reception of the optical signal with smaller optical power adjacent in the back.

In another possible implementation, the OLT allocates, according to the optical powers corresponding to the n ONTs, uplink light-emitting timeslots for sending uplink optical signals to the n ONTs in the DBA period, or the OLT groups the n ONTs according to the optical powers corresponding to the n ONTs. For example, n ONTs are divided into M groups, each group including at least one ONT. Each group corresponds to one optical power range, the optical power ranges corresponding to different groups do not overlap, and the time sequence of the uplink light-emitting time slots distributed for each group is the arrangement sequence of the optical power ranges from small to large. In other words, the time when any ONT included in the i-th group sends the uplink optical signal is earlier than the time when any ONT included in the i + 1-th group sends the uplink optical signal, the optical power corresponding to any ONT included in the i-th group is smaller than the optical power corresponding to any ONT included in the i + 1-th group, and the value of i is an integer smaller than M.

When the optical power corresponding to each of the n ONTs is divided into a plurality of ranges, it can be ensured that the influence between the optical signal corresponding to the maximum optical power and the optical signal corresponding to the minimum optical power which belong to the same range is acceptable by the system as much as possible.

For example, the optical power corresponding to n ONTs is divided into two optical power ranges. For example, an optical power value smaller than a certain value is called a small optical segment, and an optical power value equal to or larger than the certain value is called a large optical segment. The ONTs whose optical power values lie in the small optical section belong to one group and the ONTs whose optical power values lie in the large optical section belong to another group. For convenience of description, a group to which the ONT whose optical power value is located in the small optical segment belongs is referred to as a small optical segment group, and a group to which the ONT whose optical power value is located in the large optical segment belongs is referred to as a large optical segment group. When the OLT allocates the uplink light-emitting time slots to the ONTs belonging to the same group, the OLT may not limit the order of the light-emitting time slots of the OTNs in the group, and may determine the time sequence of the uplink light-emitting time slots of the OTNs included in the group according to the on-line order of the ONTs included in the group. Certainly, the time sequence of the uplink light-emitting timeslots of the ONTs included in the group may also be customized, which is not specifically limited in this embodiment of the application.

For example, for the ONTs belonging to the small optical segment group, the order of the uplink light-emitting timeslots of the ONTs included in the small optical segment group may be regarded as the order of the uplink light-emitting timeslots of the ONTs included in the small optical segment group from front to back. For the ONTs belonging to the group of the large optical segment, the time sequence of the uplink light-emitting timeslots of the ONTs included in the large optical segment group may be set according to the back-to-front arrangement sequence of the upper lines of the ONTs included in the large optical segment group.

Illustratively, 4 ONTs are taken as an example, and are respectively an ONT1-ONT4, an ONT1 and an ONT3 belong to a small optical segment group, and an ONT2 and an ONT4 belong to a large optical segment group. The received optical power corresponding to the 4 ONTs is arranged in the order of ONT3< ONT1< ONT 4< ONT 2. For the ONTs included in the same group, the time sequence of the allocated uplink light-emitting timeslots is determined by using the uplink sequence, for example, the uplink sequence of 4 ONTs is ONT1, ONT2, ONT3 and ONT 4.

ONT1 belongs to the small optical segment group, the uplink light-emitting timeslot allocated for ONT1 is the earliest in time in the DBA cycle. ONT2 belongs to the large optical segment group, the uplink light-emitting time slot allocated for ONT1 is the latest in time in the DBA cycle. If ONT3 belongs to the small optical segment group, then the uplink light-emitting timeslot allocated for ONT3 is located after the uplink light-emitting timeslot of ONT1, and if ONT4 belongs to the large optical segment group, then the uplink light-emitting timeslot allocated for ONT4 is located before the uplink light-emitting timeslot of ONT2, but not earlier than the uplink light-emitting timeslot allocated for ONT3, as shown in fig. 5. The corresponding received optical power of each ONT is indicated in fig. 5 by the height of the rectangular box. It should be noted that although the optical power of ONT3 is less than that of ONT1, ONT3 and ONT1 belong to the same group, and the influence between the optical signals of ONTs belonging to the same group is small and negligible, so that ONT3 may not be adjusted before ONT1, but may be placed after ONT 1.

In addition, in order to avoid the influence of the optical signal with higher front optical power on the optical signal with lower rear optical power at the boundary between the front and rear DBA uplink periods, a guard time interval may be configured in the DBA period. The guard time interval may be located at the end of the DBA period, i.e. after the uplink light-emitting timeslot allocated for the last OTN sending the uplink optical signal. The guard time interval may also be located at the head of the DBA period, that is, may also be located before the uplink light-emitting timeslot allocated to the first ONT transmitting the uplink optical signal. Taking the time sequence of the uplink light-emitting timeslots allocated to 4 ONTs shown in fig. 5 as an example, when the protection time interval is located at the tail of the DBA cycle, as shown in fig. 6A, the protection time interval is located after the uplink light-emitting timeslot allocated to the ONT2 that sends the uplink optical signal at the latest in the DBA cycle. If the guard interval is at the head of the DBA period, see fig. 6B, the guard interval is located before the upstream optical time slot allocated to the ONT1 that sent the upstream optical signal earliest in the DBA period.

Based on the same inventive concept as the above embodiment, the embodiment of the present application further provides a device. The device is applied to the OLT. The apparatus may be specifically a processor, a chip system, or a functional module for transmission. As shown in fig. 7, the apparatus includes an obtaining module 701, an adjusting module 702; the obtaining module 701 is configured to execute S201, and the adjusting module 702 is configured to execute S202. Optionally, the two modules may also perform other relevant optional steps performed by the OLT in any of the embodiments, which are not described herein again.

The division of the modules in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional modules in the embodiments of the present application may be integrated into one processor, may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.

An embodiment of the present application further provides an OLT structure, and as shown in fig. 8, an OLT800 includes a communication interface 810, a processor 820, and a memory 830.

The obtaining module 701 and the adjusting module 702 shown in fig. 7 may be implemented by the processor 820. The processor 820 receives the optical signal through the communication interface 810 and is used to implement the method performed by the OLT in fig. 2. In implementation, the steps of the processing flow may be implemented by instructions in the form of hardware integrated logic circuits or software in the processor 820, so as to implement the method performed by the OLT in any of the embodiments described above.

In the embodiment of the present application, the communication interface 810 may be a circuit, a bus, a transceiver, or any other device that can be used for information interaction. The other device may be a device connected to the apparatus 800, for example, the other device may be an ONT or an ONU.

The processor 820 in the embodiments of the present application may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, and may implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor, or in a combination of hardware and software elements in the processor. Program code executed by processor 820 to implement the above-described methods may be stored in memory 830. The memory 830 is coupled with the processor 820. The coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, and may be an electrical, mechanical or other form for information interaction between the devices, units or modules. The processor 820 may operate in conjunction with the memory 830. The memory 830 may be a nonvolatile memory such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (RAM), such as a random-access memory (RAM). The memory 830 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such.

The specific connection medium among the communication interface 810, the processor 820 and the memory 830 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 830, the processor 820 and the communication interface 810 are connected by a bus in fig. 8, the bus is represented by a thick line in fig. 8, and the connection manner between other components is merely illustrative and is not limited thereto. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 8, but this is not intended to represent only one bus or type of bus.

Based on the above embodiments, the present application embodiment may further provide a system, where the system includes an OLT and a plurality of ONTs (or ONUs). The OLT is used for transmitting optical signals to the ONTs or receiving the optical signals transmitted by the ONTs.

In a possible implementation manner, the ONTs send optical signals to the OLT, and the OLT executes, for the received optical signals sent by the ONTs, the method executed by the OLT in any of the above embodiments, to obtain optical power for receiving the optical signals sent by the multiple ONTs, so as to allocate an uplink light-emitting time slot to each ONT in a DBA cycle according to the optical power. And the OLT respectively notifies the uplink luminous time slots allocated to each ONT. Thus, the ONT receives the notification information sent by the OLT for notifying the upstream transmission time slot. And the ONT sends the uplink optical signal at the corresponding time according to the notification information.

In one possible implementation, the ONT receives an optical signal transmitted by the OLT, determines an optical power of the received signal based on the received optical signal, and transmits the optical power to the OLT. Therefore, the OLT allocates the uplink light-emitting time slots to the plurality of ONTs in the DBA period according to the optical power sent by each ONT, and the specific allocation manner may refer to the detailed description in the foregoing embodiment of the method, which is not described herein again. And the OLT respectively notifies the uplink luminous time slots allocated to each ONT. Thus, the ONT receives the notification information sent by the OLT for notifying the upstream transmission time slot. And the ONT sends the uplink optical signal at the corresponding time according to the notification information.

Based on the above embodiments, the present application further provides a computer storage medium, in which a software program is stored, and the software program can implement the method provided by any one or more of the above embodiments when being read and executed by one or more processors. The computer storage medium may include: u disk, removable hard disk, read only memory, random access memory, etc. may be used to store the program code.

Based on the above embodiments, the present application further provides a chip, where the chip includes a processor, and is configured to implement the functions related to any one or more of the above embodiments, such as acquiring or processing the data frame related to the above method. Optionally, the chip further comprises a memory for the processor to execute the necessary program instructions and data. The chip may be constituted by a chip, or may include a chip and other discrete devices.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

A method for allocating an uplink light-emitting time slot to an optical network device, comprising:

an Optical Line Terminal (OLT) acquires optical power corresponding to a plurality of optical network devices respectively, wherein the optical power corresponding to a first optical network device is the power of the OLT for receiving an optical signal sent by the first optical network device, or the power of the first optical network device for receiving the optical signal sent by the OLT, and the first optical network device is one of the plurality of optical network devices;

the OLT allocates uplink light-emitting time slots for the plurality of optical network devices to send uplink optical signals in a Dynamic Bandwidth Allocation (DBA) period according to the optical power respectively corresponding to the plurality of optical network devices;

wherein, an uplink light-emitting time slot of a jth optical network device in the plurality of optical network devices for sending an uplink optical signal is earlier than an uplink light-emitting time slot of a jth +1 optical network device for sending an uplink optical signal, and an optical power corresponding to the jth optical network device is smaller than an optical power corresponding to the jth +1 optical network device, a value of j is an integer smaller than n, and n is equal to the number of optical network devices communicating with the OLT.
The method of claim 1, wherein the DBA period comprises a guard time interval, and wherein the guard time interval is located after an uplink light-emitting time slot allocated to a last optical network device transmitting the uplink optical signal or before an uplink light-emitting time slot allocated to a first optical network device transmitting the uplink optical signal.
The method according to claim 1 or 2, wherein the optical network device is an optical network terminal ONT or an optical network unit ONU.
A method for allocating an uplink light-emitting time slot to an optical network device, comprising:

an Optical Line Terminal (OLT) acquires optical power corresponding to a plurality of optical network devices respectively, wherein the optical power corresponding to a first optical network device is the power of the OLT for receiving an optical signal sent by the first optical network device, or the power of the first optical network device for receiving the optical signal sent by the OLT, and the first optical network device is one of the plurality of optical network devices;

the OLT allocates uplink light-emitting time slots for the plurality of optical network devices to send uplink optical signals in a Dynamic Bandwidth Allocation (DBA) period according to the optical power respectively corresponding to the plurality of optical network devices;

the plurality of optical network devices are divided into M groups, one group includes at least one optical network device, an uplink light-emitting time slot, in which any optical network device included in the ith group sends an uplink optical signal, is earlier than an uplink light-emitting time slot, in which any optical network device included in the (i + 1) th group sends an uplink optical signal, optical power corresponding to any optical network device included in the ith group is smaller than optical power corresponding to any optical network device included in the (i + 1) th group, M is an integer greater than 1, and a value of i is an integer smaller than M.
The method of claim 4, wherein the DBA period comprises a guard time interval, and wherein the guard time interval is located after an uplink light-emitting time slot allocated to a last optical network device transmitting the uplink optical signal or before an uplink light-emitting time slot allocated to a first optical network device transmitting the uplink optical signal.
The method according to claim 4 or 5, wherein the optical network device is an optical network terminal ONT or an optical network unit ONU.
An allocation device for upstream light-emitting time slots of optical network equipment, which is applied to an Optical Line Terminal (OLT), and comprises:

an obtaining module, configured to obtain optical powers corresponding to multiple optical network devices, where an optical power corresponding to a first optical network device is a power of an optical signal sent by the first optical network device and received by the OLT, or a power of an optical signal sent by the OLT and received by the first optical network device, and the first optical network device is one of the multiple optical network devices;

the adjusting module is used for allocating uplink light-emitting time slots for the plurality of optical network devices to send uplink optical signals in a Dynamic Bandwidth Allocation (DBA) cycle according to the optical powers respectively corresponding to the plurality of optical network devices;

wherein, an uplink light-emitting time slot of a jth optical network device in the plurality of optical network devices for sending an uplink optical signal is earlier than an uplink sending time slot of a jth +1 optical network device for sending an uplink optical signal, and optical power corresponding to the jth optical network device is smaller than optical power corresponding to the jth +1 optical network device, j takes an integer smaller than n, and n is equal to the number of optical network devices communicating with the OLT.
The apparatus of claim 7, wherein the DBA period comprises a guard time interval after an uplink light-emitting time slot allocated for a last optical network device transmitting the uplink optical signal or before an uplink light-emitting time slot allocated for a first optical network device transmitting the uplink optical signal.
The apparatus according to claim 7 or 8, wherein the optical network device is an optical network terminal ONT or an optical network unit ONU.
An allocation device for upstream light-emitting time slots of optical network equipment, which is applied to an Optical Line Terminal (OLT), comprises:

an obtaining module, configured to obtain optical powers corresponding to multiple optical network devices, where an optical power corresponding to a first optical network device is a power of an optical signal sent by the first optical network device and received by the OLT, or a power of an optical signal sent by the OLT and received by the first optical network device, and the first optical network device is one of the multiple optical network devices;

the adjusting module is used for allocating uplink light-emitting time slots used for sending uplink optical signals in a dynamic bandwidth allocation DBA to the plurality of optical network devices according to optical power cycles respectively corresponding to the plurality of optical network devices;

the plurality of optical network devices are divided into M groups, one group includes at least one optical network device, an uplink light-emitting time slot, in which any optical network device included in the ith group sends an uplink optical signal, is earlier than an uplink light-emitting time slot, in which any optical network device included in the (i + 1) th group sends an uplink optical signal, optical power corresponding to any optical network device included in the ith group is smaller than optical power corresponding to any optical network device included in the (i + 1) th group, M is an integer greater than 1, and a value of i is an integer smaller than M.
The apparatus of claim 10, wherein the DBA period comprises a guard time interval after an uplink light-emitting time slot allocated for a last optical network device transmitting the uplink optical signal or before an uplink light-emitting time slot allocated for a first optical network device transmitting the uplink optical signal.
The apparatus according to claim 10 or 11, wherein the optical network device is an optical network terminal ONT or an optical network unit ONU.
An optical line terminal comprising a processor and a memory, wherein:

the memory is used for storing program codes;

the processor is used for reading and executing the program codes stored in the memory so as to realize the method of any one of claims 1 to 6.
A passive optical network, PON, system comprising the OLT of claim 13 and a plurality of optical network devices in communication with the OLT.