CN117177104A

CN117177104A - Information feedback method, equipment and storage medium

Info

Publication number: CN117177104A
Application number: CN202210593206.4A
Authority: CN
Inventors: 朱景龙; 李俊玮; 张德朝
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2023-12-05
Also published as: WO2023227096A1

Abstract

The invention discloses an information feedback method, equipment and a storage medium, comprising the following steps: and the OLT feeds back fourth information to the ONU when judging that the effective bandwidth and/or the time delay do not meet the requirement according to at least one of the first information, the second information of the ONU and the third information. By adopting the invention, the time delay can be reduced, the protection time interval required by each ONU can be determined to be optimized, and the bandwidth utilization rate is improved.

Description

Information feedback method, equipment and storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to an information feedback method, an information feedback device, and a storage medium.

Background

In recent years, network delay performance is getting more and more attention, and is becoming a new hot spot in the communication industry. Low latency networks have also become a network development of interest to operators.

PON (passive optical network ) has become a mainstream technology of an optical access network, and with the continuous improvement of ODN (optical distribution network ) network coverage, the PON network is used as the first kilometer of user service access, and needs to simultaneously meet different network access bearer requirements of different services. Telecommunication networks are being deeply integrated with various industries, and some emerging industries and emerging services place near-stringent demands on network latency, even to the extent that existing optical access network technologies and networking structures are not adequate.

With the development of the domestic industrial internet, the service demands of factories for scenes such as machine vision quality inspection, equipment collaborative operation, equipment fault diagnosis, production field detection and the like emerge, and compared with the traditional industrial internet technology based on copper wires (twisted pair wires and network cables), the PON access network has obvious advantages: anti-interference, easy deployment, easy expansion, long relay-free transmission distance, etc. PON devices can be deployed in workshops and factory settings in industrial production networks for carrying industrial production, monitoring and office data traffic. Different industrial applications, the demands on the bearer network are also different. The bandwidth requirements and response times are different in different scenarios, and for field-level network applications, the low latency, low jitter characteristics of the carrier network will be very critical requirements, which can be as high as millisecond or even sub-millisecond. Therefore, it is very necessary to perform deep analysis on the low-latency service requirements, so as to further research the low-latency optimization technology of the optical access network, so as to better meet the low-latency service requirements.

The prior art has the following defects: the scheme used to guarantee that access to a new ONU (optical network unit ) can be allowed cannot effectively reduce the average upstream burst transmission delay.

Disclosure of Invention

The invention provides an information feedback method, equipment and a storage medium, which are used for solving the problem that an average uplink burst transmission time delay cannot be effectively reduced by a scheme used for ensuring that access of a new ONU can be allowed.

The invention provides the following technical scheme:

an information feedback method, comprising:

and the OLT feeds back fourth information to the ONU when judging that the effective bandwidth and/or the time delay do not meet the requirement according to at least one of the first information, the second information of the ONU and the third information.

In practice, the first information is used to represent a minimum effective bandwidth and/or to represent a required maximum delay.

In an implementation, the first information is a minimum bandwidth tolerance and/or a maximum latency requirement.

In practice, the method further comprises:

the OLT receives second information sent by the ONU.

In an implementation, the second information of the ONU is device information of the ONU.

In implementation, the device information of the ONU is physical capability information of the ONU.

In an implementation, the OLT receives capability information sent by an ONU, including:

the OLT receives second information reported by the ONU;

and/or the OLT receives second information sent by the ONU according to the requirement of the OLT.

In practice, the method further comprises:

The OLT also receives a first identifier reported by the ONU, wherein the first identifier is used for indicating whether the ONU is adjustable.

In practice, the method further comprises:

the OLT obtains third information at least according to the second information of the ONU;

the judging that the effective bandwidth and/or the time delay do not meet the requirement comprises the following steps:

and the OLT judges that the effective bandwidth and/or the time delay do not meet the requirements according to the first information and the third information.

In implementation, the bandwidth mapping BWmap calculation result of the OLT is obtained at least according to the OLT first information and/or the ONU second information.

In an implementation, the OLT obtains third information at least according to the second information of the ONU, including:

the BWmap in the OLT is calculated at least according to the second information of the ONU, and takes the total result or part of the result of calculation, or the result after processing the total or part of the result, as the third information.

In an implementation, the third information is a bandwidth value and/or a delay value.

In an implementation, the second information of the ONU is adjustable or non-adjustable information.

In an implementation, the feeding back the fourth information to the ONU includes:

and feeding back fourth information to the ONU for adjustment by the ONU.

In practice, the method further comprises:

when the judging times exceeds M, the OLT modifies the first information;

Wherein M is an integer greater than 0.

An OLT, comprising:

a processor for reading the program in the memory, performing the following process:

according to at least one of the first information, the second information and the third information of the ONU, when the effective bandwidth and/or the time delay are judged to be unsatisfied with the requirement, fourth information is fed back to the ONU;

and a transceiver for receiving and transmitting data under the control of the processor.

In practice, the method further comprises:

and receiving the second information sent by the ONU.

receiving second information reported by an ONU;

and/or receiving second information sent by the ONU according to the requirement of the OLT.

In practice, the method further comprises:

and receiving a first identifier reported by the ONU, wherein the first identifier is used for indicating whether the ONU is adjustable.

In practice, the method further comprises:

Obtaining third information at least according to the second information of the ONU;

and judging that the effective bandwidth and/or the time delay do not meet the requirement according to the first information and the third information.

In an implementation, obtaining the third information at least according to the second information of the ONU includes:

and feeding back fourth information to the ONU for adjustment by the ONU.

In practice, the method further comprises:

when the judging times exceeds M, the OLT modifies the first information;

wherein M is an integer greater than 0.

An OLT, comprising:

and the feedback module is used for feeding back fourth information to the ONU when judging that the effective bandwidth and/or the time delay do not meet the requirement according to at least one of the first information, the second information and the third information of the ONU.

In practice, the method further comprises:

and the first receiving module is used for receiving the second information sent by the ONU.

In an implementation, the first receiving module is further configured to, when receiving capability information sent by the ONU, include:

receiving second information reported by an ONU;

In practice, the method further comprises:

the second receiving module is used for the OLT to also receive a first identifier reported by the ONU, and the first identifier is used for indicating whether the ONU is adjustable or not.

In practice, the method further comprises:

the information module is used for obtaining third information at least according to the second information of the ONU;

the feedback module is further configured to, when the determining that the effective bandwidth and/or the delay do not meet the requirement, include:

In an implementation, the information module is further configured to, when obtaining the third information at least according to the second information of the ONU, include:

In an implementation, the feedback module is further configured to, when feeding back the fourth information to the ONU, include:

and feeding back fourth information to the ONU for adjustment by the ONU.

In practice, the method further comprises:

the modification module is used for modifying the first information when the judging times exceed M;

wherein M is an integer greater than 0.

A computer readable storage medium storing a computer program which when executed by a processor implements the above-described information feedback method.

The invention has the following beneficial effects:

in the technical scheme provided by the embodiment of the invention, only the maximum available bandwidth parameter is considered for the DBA algorithm applied to the single-frame multi-burst system at present, the guard intervals between adjacent ONUs are generally the same, and the joint optimization of throughput and time delay cannot be realized by taking the guard interval required by the ONU with the worst performance as a reference. Therefore, the OLT feeds back fourth information to the ONU when judging that the effective bandwidth and/or the delay do not meet the requirement according to at least one of the first information, the second information of the ONU, and the third information.

Because the second information (such as equipment information/capability information of the ONU) of the ONU is introduced in the DBA calculation process, the time delay and the bandwidth can be balanced in a targeted manner according to the real-time condition of the ONU, and the low-time delay system applied by the scheme provided by the embodiment of the invention can improve the utilization rate of the bandwidth while reducing the time delay;

the third information can be the bandwidth value or the time delay value calculated according to the current parameter condition, and the bandwidth value or the time delay value calculated by the embodiment of the invention can be compared with the target value of the first information, so that the time delay and the bandwidth can be dynamically adjusted, and the utilization rate of the bandwidth is improved while the time delay is reduced.

Further, the OLT may determine the time slot allocation of each ONU in the upstream frame by using the minimum bandwidth tolerance and the physical layer capability reported by each ONU as the input parameters calculated by the BWmap, and since the minimum bandwidth tolerance (Rm) of the system and the physical layer capability of each ONU are added as the input parameters calculated by the BWmap, it makes sense only if the delay is reduced on the premise of reducing the delay, and further, since the physical layer capability of each ONU can be perceived, the guard interval with the adjacent ONU can be determined according to the actual situation of each ONU, so that the guard time interval required by each ONU can be determined to be optimized, and the bandwidth utilization rate is also improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

fig. 1 is a schematic flow chart of an implementation of an information feedback method at an OLT side in an embodiment of the present invention;

FIG. 2 is a schematic diagram of a single frame multi-burst in an embodiment of the present invention;

FIG. 3 is a schematic block diagram of DBA computation in an embodiment of the invention;

fig. 4 is a schematic diagram of low-latency and deterministic latency ONU slot allocation in accordance with an embodiment of the present invention;

fig. 5 is a schematic diagram of an interaction mechanism of an ONU reporting capability to an OLT in an embodiment of the present invention;

fig. 6 is a schematic diagram of an interaction mechanism of OLT processing and result issuing ONUs in the embodiment of the present invention;

fig. 7 is a schematic diagram of an OLT structure in an embodiment of the present invention.

Detailed Description

The inventors noted during the course of the invention that:

in order to ensure that access to a new ONU (optical network unit ) can be allowed, the OLT (optical line terminal ) will periodically open a silence window, during which an already on-line ONU is not allowed to send upstream data, and only unregistered ONUs are allowed to send registration request messages. Since the ONU distance allowed by a typical PON system needs to cover 0-20 km, the round trip delay difference of transmission on the optical fiber reaches 200 microseconds. Thus, during ONU registration phase, the silence window size is typically 250 microseconds in length. In addition to registration, when an ONU needs ranging, the OLT also needs to complete with an upstream silence window. Since the registration/ranging window does not allow the normal ONU to transmit the uplink data, if the ONU has uplink traffic to transmit at this time, it can only wait for the silence window to end to transmit. Thus, the registration/ranging window of the PON system introduces an additional delay, typically 250 microseconds.

In order to avoid the extra delay and jitter introduced by registration/ranging windowing, an effective approach is to introduce an extra one wavelength channel. The OLT and the ONU are provided with 2 uplink channels, wherein one uplink channel is used for normal service and management; another channel is used for registration/ranging, and at the same time, the registration/ranging channel may also be used for transmitting uplink traffic. In the system, there are 2 uplink wavelength channels and 1 downlink wavelength channel, the uplink and downlink respectively adopt different wavelengths, and share the same ODN network through wavelength division multiplexing. The transmission of the ONU activation response message and the user data transmission after the ONU activation online can be flexibly configured according to the service requirement, for example, the first uplink channel is configured to activate+user data transmission (at this time, the channel is an uplink channel with a larger time delay and is mainly used for transmitting user data or service with insensitive time delay), the second uplink channel is configured to transmit and receive only user data (the uplink channel is an uplink channel with a low time delay and is used for transmitting user data or service with sensitive time delay), or vice versa, the first uplink channel is configured to transmit and receive only user data, and the second uplink channel is configured to activate+user data transmission. In some specific application scenarios, in order to achieve load balancing between two uplink transmission channels, corresponding information intercommunication may need to be performed between two DBA (dynamic bandwidth allocation ) scheduling modules of the OLT to achieve uplink bandwidth scheduling optimization. The uplink bandwidth grant of 2 uplink channels may be allocated by Bwmap (bandwidth map) in the same downlink channel.

This approach can only reduce the maximum delay, but has very little impact on the reduction of the average delay.

From the above scheme, it can be seen that the influence of the registration/ranging window can be completely eliminated by adding additional uplink wavelength channels, and both the ONU and the OLT need to add an additional wavelength channel, and further need to add an additional logic processing chip to complete the co-scheduling of 2 uplink wavelength channels. Therefore, this solution introduces a certain cost increase and requires modification of the hardware of the boards and modules, which is not supported by the current conventional PON system hardware. From the above analysis, it can be seen that the conventional silence window size is 250 microseconds, the most critical factor of which is to consider that the farthest and nearest ONU distance differences in the system may occur to be 20km. However, in an actual PON network deployment, this does not occur. The distances of the trunk optical fiber parts of the ONUs under the same PON port are the same, and the distance difference is mainly reflected in the branch optical fibers. For certain scenarios, such as 5G bearer or industrial field applications, different ONU branch fiber differences under the same PON port are controllable. Taking the single PON port as an example, the maximum distance difference between the branched optical fibers is 1km, the round trip delay difference between the branched optical fibers and the optical fibers is about 10 microseconds, and if the random delay of the ONU is 48 microseconds and the response time of the ONU is 2 microseconds during conventional windowing, the windowing size is 60 microseconds, so that the requirement can be satisfied. By this windowing, the extra delay of the original 250 microseconds can be reduced to 60 microseconds without adding hardware resources.

This scheme can only reduce the maximum delay, but has very little impact on the reduction of the average delay; at the same time, the jitter still depends on the time of opening the small window, and the jitter cannot be eliminated.

Both of the above schemes are directed to reducing latency by eliminating or reducing the time of the silence window. However, the number of times the silence window is opened is about once per second, so the above scheme hardly reduces the average delay.

Based on the above, the embodiment of the invention provides a passive optical network uplink time slot allocation scheme supporting low time delay and deterministic time delay, which can effectively reduce uplink burst transmission time delay, realize deterministic time delay transmission and improve bandwidth utilization.

The following describes specific embodiments of the present invention with reference to the drawings.

In the description process, the implementation of the OLT and the ONU will be described separately, and then an example of the implementation of the OLT and the ONU will be given to better understand the implementation of the scheme given in the embodiment of the present invention. Such an explanation does not mean that the two must be implemented cooperatively or separately, and in fact, when the OLT and the ONU are implemented separately, they solve the problem on one side of each, and when the two are used in combination, a better technical effect is obtained.

Fig. 1 is a schematic flow chart of an implementation of an information feedback method at an OLT side, and as shown in the drawing, may include:

and 101, the OLT feeds back fourth information to the ONU when judging that the effective bandwidth and/or the time delay do not meet the requirement according to at least one of the first information, the second information and the third information of the ONU.

In practice, the effective bandwidth and/or latency herein may also be referred to as the available bandwidth and/or latency. Here, the ONU may be one ONU or a plurality of ONUs, and may feed back to one ONU or a plurality of ONUs. When the OLT hangs down a plurality of ONUs, the feeding back the fourth information to the ONUs here may be: and feeding back fourth information to one or part or all of the plurality of ONUs.

The first information here may be preconfigured. The first information may also be subsequently reset or modified by itself. The first information here acts as a target value or threshold value for comparison with the actual value to determine whether the demand can be met at present.

Because the second information (specifically, the equipment information/capability information of the ONU and the like) of the ONU is introduced in the DBA calculation process, the time delay and the bandwidth can be purposefully balanced according to the real-time situation of the ONU, so that the low-time delay system applied by the method provided by the embodiment of the invention can improve the utilization rate of the bandwidth while reducing the time delay.

In a specific implementation, for example, an ONU may determine a physical layer capability; and the physical layer capacity reported by the ONU to the OLT is used for the OLT to determine the time slot allocation of each ONU in the uplink frame.

The OLT determines a minimum bandwidth tolerance and receives physical layer capacity reported by each ONU, wherein the minimum bandwidth is the minimum available bandwidth expected to be realized;

and determining the time slot allocation of each ONU in the uplink frame by taking the minimum bandwidth tolerance and the physical layer capacity reported by each ONU as input parameters calculated by BWMap.

In a TDM (time division multiplexing ) PON system, a multiplexing mechanism of TDMA (time division multiple access ) is employed for the uplink. The OLT is responsible for allocating and scheduling an upstream transmission slot window of the ONU, and the ONU can only transmit upstream data within the slot allocated by the OLT. Since the PON system is a point-to-multipoint physical topology connection, the receiving timeslots of the OLT need to be reasonably allocated to all ONUs. For a specific ONU, the uplink time slot window is limited, and the period from the end of a certain uplink time slot to the start of the next time slot is a transmission time slot belonging to other ONUs, and the specific ONU cannot transmit any uplink data, and during this period, the data to be transmitted will be locally buffered in the ONU, and wait for the arrival of the next time slot for retransmission. Therefore, the upstream time slot interval has a large influence on the upstream time delay of the ONU. In the TDM PON system of ITU (international union, international Telecommunication Union) system, an upstream timeslot allocation packet of an ONU is located in a BWmap of fixed overhead of a frame header of each downstream frame, and each BWmap may complete allocation of an upstream timeslot of 125 microseconds corresponding to the downstream frame. In each frame, each ONU has only one transmission time slot, and if the uplink service of the ONU just arrives, and the transmission time slot just arrives or has passed, the service needs to wait for the arrival of the next time slot, which causes additional uplink delay, and cannot meet the scenes and services (industrial PON, 5G substation backhaul, cloud VR (Virtual Reality) service, etc.) with high requirements on delay and jitter, so that new technology needs to be introduced to optimize the uplink delay.

In particular, the first information herein indicates the smallest available bandwidth, and may also be understood as indicating the smallest available bandwidth, etc. The minimum bandwidth tolerance (Minimum effective bandwith, minimum available bandwith, minimum tolerance bandwidth, or Minimum distributable bandwidth) may be specifically referred to as minimum bandwidth tolerance, or referred to as minimum tolerance bandwidth, minimum bandwidth utilization, or minimum bandwidth threshold, etc., where the minimum available bandwidth that the OLT can allocate to all ONUs down-link each time the OLT performs DBA process, i.e., the bandwidth that is used for transmitting ethernet packets or the bandwidth of transmitting GEM (GPON encapsulation, G-PON Encapsulation Mode; GPON: gigabit-Capable PON) frames. For example, the line rate is 10Gbps, and when the first information is an effective/available bandwidth, the first information may be specifically one line rate value, for example, 6Gbps; when the first information is the minimum bandwidth utilization, the first information may be specifically a percentage, for example 60%.

Of course, the first information here may also represent an inactive bandwidth, through which the OLT obtains the minimum active bandwidth. For example, the line rate is 10Gbps, and when the first information is an inactive bandwidth, the first information may specifically be a line rate value, for example, 4Gbps, and then the OLT may obtain the minimum active bandwidth of 6Gbps according to the line rate and the inactive bandwidth; when the first information is the non-effective bandwidth utilization, the first information may be specifically a percentage, for example, 40%, so that the OLT may obtain the minimum bandwidth utilization as 60% according to the line rate and the non-effective bandwidth.

In practice, it may further comprise:

the OLT receives second information sent by the ONU.

Specifically, the ONU may periodically send the second information, or may continuously send the second information, or may send the second information at intervals, or may send the second information according to event triggering.

In a specific implementation, the second information of the ONU is device information of the ONU.

Specifically, the device information of the ONU herein may specifically be device capability information of the ONU, which is used to indicate the device capability of the ONU. It will be appreciated that the device capabilities of an ONU may change over time, e.g. the device capabilities of an ONU are best shipped from the factory, and will deteriorate over time. In the embodiment of the invention, the device information of the ONU, which is received by the OLT and sent by the ONU, can be understood as the device capability condition of the current ONU. That is, the device capability condition changes with time, so that the ONU needs to send the current device capability condition to the OLT multiple times or periodically, so that the OLT can determine whether to meet the bandwidth and/or the requirement of the delay according to the real-time device capability condition of the ONU, and further can dynamically balance the delay and the bandwidth, so that the bandwidth utilization rate of the system is maximized.

In a specific implementation, the device information of the ONU is physical capability information of the ONU.

Specifically, the physical capability information of the ONU herein is used to represent the physical capability of the ONU. For example, switching time of ONU laser, response time of APD, etc.

the OLT receives second information reported by the ONU;

Specifically, the first case refers to the ONU actively reporting capability information to the OLT, and the second case refers to the ONU sending the capability information according to the requirement and/or the request of the OLT. These two cases may only exist, or both, e.g. an ONU supports active reporting, while also supporting sending capability information according to the OLT's requirements or requests.

In specific implementation, the method can further comprise:

In practice, it may further comprise:

correspondingly, the judging that the effective bandwidth and/or the time delay do not meet the requirement comprises the following steps:

Specifically, the determining according to the first information and the third information may actually be comparing the first information and the third information, that is, comparing the calculated bandwidth and/or delay value with the target bandwidth and/or delay value, so as to determine whether the requirement is met.

The OLT may consider other parameters in addition to the second message reported and/or sent by the ONU when calculating the third information. For example, the number of ONUs may be specifically the number of on-line ONUs to be hung down, etc.; as another example, the TIA in the OLT and the response time of the limiting amplifier, etc.

In a specific implementation, the calculation result of the bandwidth mapping BWmap of the OLT is obtained at least according to the first information of the OLT and/or the second information of the ONU.

In a specific implementation, the OLT obtains third information at least according to the second information of the ONU, including:

In a specific implementation, the third information is a bandwidth value and/or a delay value.

Specifically, the second information of the ONU is adjustable: the second information reported by the ONU is adjustable to the OLT. For example, when the ONU is known to be an adjustable ONU (there is not necessarily a step of judging whether the ONU is adjustable or not, and the ONU may be adjusted by default), in the subsequent adjustment, the ONU may be controlled to adjust within a range greater than or equal to N.

The second information of the ONU is not adjustable means that: the second information reported by the ONU is not adjustable to the OLT. For example, if the on-time of the ONU laser is fixed to N, then the subsequent OLT cannot adjust the on-time of the ONU laser.

and feeding back fourth information to the ONU for adjustment by the ONU.

In practice, it may further comprise:

when the judging times exceeds M, the OLT modifies the first information;

wherein M is an integer greater than 0.

Specifically, in actual cases, the following may occur: all ONU hung under the OLT are in a limit working state, but after multiple judgments, the bandwidth and/or the time delay threshold represented by the first information still cannot be met, and at this time, the system may be in a locking state. To avoid such a situation, embodiments of the present invention may further include: when the number of times of judgment exceeds M (M is an integer greater than 0), the OLT may modify the first information, i.e. modify the bandwidth and/or the delay threshold represented by the first information, in order to prevent a deadlock situation.

Fig. 2 is a schematic diagram of single frame multiple bursts, and the scheme for allocating uplink timeslots in a passive optical network supporting low latency and deterministic latency according to the embodiment is shown in fig. 2, and is executed by the OLT according to the content reported by the ONUs. And the OLT determines the burst number of each ONU in the single frame according to the content reported by the ONU, thereby meeting the requirement of the service on the time delay tau. When each ONU has N uplink burst time slots in every 125 microseconds, the maximum time delay is reduced to 1/N (N is a positive integer) when the interval between the time slots is 125/N microseconds. Optionally, zero jitter is achieved when the burst position of each ONU within each frame remains unchanged. That is, in implementation, the method may further include:

After determining the burst number of each ONU in a single frame, the burst position of each ONU in each frame is kept unchanged, and the ONU can also be changed as required.

In the TDM PON system, each burst packet sent by an ONU needs to have a certain preamble pattern, that is, a so-called guard time interval, and the preamble occupies part of the uplink time slot, and introduces a certain overhead. The greater the number of bursts per frame, the greater the overhead introduced by the preamble. Therefore, the number of bursts within a single frame cannot be increased without limit, otherwise, the upstream bandwidth efficiency in the system becomes very low; on the other hand, under the specific burst number, the effective bandwidth can be improved to the maximum extent by adaptively optimizing the guard interval between adjacent bursts. The guard interval is determined by the number of ONUs, the time of the ONU laser switching, the corresponding time of the APD (avalanche photodiode ) at the OLT end, the TIA (transimpedance amplifier ) and the response time of the limiting amplifier. Therefore, in the embodiment, a DBA calculation scheme of delay and bandwidth joint optimization is provided, the minimum bandwidth tolerance of the system and the physical layer capacity of each ONU are taken as new input parameters to be incorporated into DBA calculation, the guard interval of adjacent time slots can be determined according to the physical characteristics of ONUs allocated by the time slots, and therefore, ONUs with poorer performance do not need to be migrated, and the uplink delay is reduced while the bandwidth utilization rate is improved. The specific implementation can be as follows:

Fig. 3 is a schematic block diagram of DBA calculation, and as shown in the drawing, in the PON system, the uplink timeslot allocation of an ONU in each frame is obtained by calculating the DBA in the OLT. The prior DBA algorithm does not sense the physical layer capacity of each ONU, only considers the maximum available bandwidth parameter, and when the algorithm is applied to a single-frame multi-burst system, the guard interval between adjacent ONUs is generally the same, and the joint optimization of throughput and time delay cannot be realized by taking the guard interval required by the ONU with the worst performance as a reference. Therefore, in the scheme provided by the embodiment, the minimum bandwidth tolerance (Rm) of the system and the physical layer capacity of each ONU are added as input parameters of BWmap calculation, and it is meaningful to reduce the delay on the premise that the minimum bandwidth is the minimum available bandwidth expected to be realized. The physical layer capacity of the ONU is perceived, and the protection interval between each ONU and the adjacent ONU can be determined according to the actual condition of each ONU, so that the protection time interval required by each ONU can be determined to be optimized, and the bandwidth utilization rate is improved. BWMap calculates the time slot allocation of each ONU in the upstream frame according to the input parameters. The OAM in fig. 3 is maintained for operation administration (Operation Administration and Maintenance).

In implementation, the physical layer capability reported by the ONU includes one or a combination of the following capabilities:

Switching time of ONU laser and response time of APD.

In practice, the physical layer capability reported by each ONU is received through one or a combination of the following management channels:

OMCI、TR069、PLOAM。

in implementation, the OLT side may further include:

and informing each ONU of the time slot allocation result through the management channel.

Correspondingly, the ONU side includes:

and receiving the time slot allocation result notified by the OLT through the management channel.

In implementation, the OLT side may further include:

and determining uplink bandwidth allocation by taking physical layer capacity reported by each ONU, response time of TIA and limiting amplifier in the OLT and minimum bandwidth tolerance as input parameters calculated by BWMap.

In a specific implementation, after determining the uplink bandwidth allocation, the method further includes:

and when the effective bandwidth does not meet the requirement, notifying each ONU to adjust the corresponding physical layer parameter until the effective bandwidth is determined to meet the requirement, and notifying each ONU of the time slot allocation result through the management channel.

Correspondingly, the ONU side includes:

after determining the uplink bandwidth allocation, further comprising:

and adjusting physical layer parameters according to the notification of the OLT, and receiving a time slot allocation result notified by the OLT through the management channel.

The following is an example.

Fig. 4 is a schematic diagram of low-latency and deterministic-latency ONU slot allocation, which is shown in fig. 4. The ONU physical layer capacity collecting and regulating device is arranged in the ONU, the PON low-delay optimizing device is arranged in the OLT, the ONU physical layer capacity collecting and regulating device and the PON low-delay optimizing device are named for convenience of description, and corresponding devices can be set according to the needs in specific practice.

Fig. 5 is a schematic diagram of an interaction mechanism of reporting capability of an ONU to an OLT, where an ONU physical layer capability collection and control device collects the ONU's own physical layer capability, and reports the ONU's own physical layer capability to the OLT through a management channel. The reporting capability at least comprises the switching time of the ONU laser, the response time of the APD and the like. Reporting is performed through a management channel, including but not limited to OMCI (ONT management and control interface, ONT Management and Control Interface; ONT: optical network terminal, optical Network Terminal), TR069 (user terminal equipment wide area network management protocol), PLOAM (physical layer operation management and maintenance, physical Layer Operations, administration and Maintenance), etc. And the ONU acquires uplink transmission time slots, the switching time of the laser and the APD response time information by analyzing messages in a downlink management channel (including but not limited to OMCI, PLOAM or TR069 and the like) and adjusting the switching time of the laser and the APD response time as required by receiving the feedback result of the PON low-delay optimizing device.

Fig. 6 is a schematic diagram of an interaction mechanism of OLT processing and result issuing ONUs, as shown in the figure, including:

On the OLT side: the OLT reads the physical layer capability reported by the ONU, and performs DBA optimization calculation by combining the capability of the switching time and the APD response time of the laser collected from the ONU:

if the ONU has the adjusting capability, the switching time and the APD response time of the ONU laser are used as parameter input in the calculation process, and the optimization is carried out.

If the ONU does not have the adjustment capability, the switching time and the APD response time of the ONU laser are not changed in the calculation process.

The ONU is informed of the calculation result through a downstream management channel (including but not limited to OMCI, PLOAM or TR 069).

On the ONU side: the ONU obtains the upstream transmit time slot, the switching time of the laser, and APD response time information by parsing the messages in the downstream management channels (including but not limited to OMCI, PLOAM, or TR 069).

Specifically, the PON low-latency optimization device senses the capability of reporting by the ONU, the TIA in the OLT, and the response time of the limiting amplifier, and uses the above parameters together with the minimum bandwidth tolerance report Bwmap of the system to calculate the upstream bandwidth allocation. The PON low-delay optimizing device senses the BWMap feedback result for current calculation, judges whether the effective bandwidth, the delay and the like meet the requirements at the moment, if not, feeds back to the ONU to adjust the corresponding physical layer parameters, and feeds the ONU to the OLT to perform calculation again. Repeating the steps until the time slot allocation result meeting the required time delay and jitter is obtained, and informing each ONU of the time slot allocation result through the management channel.

Based on the same inventive concept, the embodiments of the present invention further provide an OLT and a computer readable storage medium, and since the principle of solving the problem by these devices is similar to that of the timeslot allocation method, the implementation of these devices may refer to the implementation of the method, and the repetition is omitted.

In implementing the technical scheme provided by the embodiment of the invention, the method can be implemented as follows.

Fig. 7 is a schematic structural diagram of an OLT, where the OLT includes:

the processor 700 is configured to read the program in the memory 720, and execute the following procedures:

a transceiver 710 for receiving and transmitting data under the control of the processor 700.

In practice, the method further comprises:

and receiving the second information sent by the ONU.

receiving second information reported by an ONU;

In practice, the method further comprises:

and the BWMap in the OLT is calculated according to at least the second information of the ONU, and takes the total result or partial result of the calculated result or the result obtained by processing the total result or partial result as three information.

and feeding back fourth information to the ONU for adjustment by the ONU.

In practice, the method further comprises:

when the judging times exceeds M, the OLT modifies the first information;

wherein M is an integer greater than 0.

Wherein in fig. 7, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 700 and various circuits of memory represented by memory 720, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 710 may be a number of elements, i.e. comprising a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 in performing operations.

The embodiment of the invention also provides an OLT, which comprises:

In practice, the method further comprises:

receiving second information reported by an ONU;

In practice, the method further comprises:

In an implementation, the feedback module is further configured to obtain a bandwidth mapping BWmap calculation result of the OLT at least according to the first information of the OLT and/or the second information of the ONU.

and feeding back fourth information to the ONU for adjustment by the ONU.

In practice, the method further comprises:

wherein M is an integer greater than 0.

For convenience of description, the parts of the above apparatus are described as being functionally divided into various modules or units, respectively. Of course, the functions of each module or unit may be implemented in the same piece or pieces of software or hardware when implementing the present invention.

The embodiment of the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program realizes the information feedback method when being executed by a processor.

Specific implementation can be seen from the implementation of the information feedback method.

In summary, the embodiment of the invention provides a passive optical network uplink time slot allocation scheme supporting low-latency and deterministic latency, a DBA algorithm supporting joint optimization of latency and effective bandwidth, a PON low-latency optimization scheme at the OLT side, an ONU physical layer capability collection and adjustment scheme at the ONU side, and an interaction mechanism supporting ONU protection interval capability reporting.

Aiming at the scenes sensitive to time delay and jitter, such as industrial and 5G small station backhaul, the transmission effect with low time delay and zero jitter is realized by the provided DBA calculation method for reducing the time delay and improving the effective bandwidth.

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

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. An information feedback method, comprising:

and the optical line terminal OLT feeds back fourth information to the ONU when judging that the effective bandwidth and/or the time delay do not meet the requirement according to at least one of the first information, the second information and the third information of the optical network unit ONU.

2. The method according to claim 1, wherein the method further comprises:

3. The method according to claim 2, characterized in that the bandwidth map BWmap calculation result of the OLT is obtained at least from the OLT first information and/or the ONU second information.

4. The method of claim 2, wherein the OLT obtains third information based at least on the second information of the ONUs, comprising:

the bandwidth mapping BWmap in the OLT is calculated at least according to the second information of the ONU, and takes the total result or part of the result of calculation, or the result after processing the total or part of the result, as the third information.

5. The method of claim 4, wherein the third information is a bandwidth value and/or a delay value.

6. The method according to claim 1, characterized in that the first information is used for representing a minimum effective bandwidth and/or for representing a required maximum delay.

7. The method according to claim 1 or 6, wherein the first information is a minimum bandwidth tolerance and/or a maximum latency requirement.

8. The method according to claim 1, wherein the method further comprises:

The OLT receives second information sent by the ONU.

9. The method of claim 8, wherein the second information of the ONU is device information of the ONU.

10. The method of claim 9, wherein the device information of the ONU is physical capability information of the ONU.

11. The method of claim 1, wherein the OLT receives capability information sent by an ONU, comprising:

the OLT receives second information reported by the ONU;

12. The method of claim 11, wherein the method further comprises:

13. The method of claim 1, wherein the second information of the ONU is adjustable or non-adjustable information.

14. The method of claim 1, wherein the feeding back fourth information to the ONU comprises:

and feeding back fourth information to the ONU for adjustment by the ONU.

15. The method according to claim 1, wherein the method further comprises:

when the judging times exceeds M, the OLT modifies the first information;

Wherein M is an integer greater than 0.

16. An OLT, comprising:

17. An OLT, comprising:

18. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed by a processor, implements the method of any of claims 1 to 15.