WO2023227096A1

WO2023227096A1 - Information feedback method, device, and storage medium

Info

Publication number: WO2023227096A1
Application number: PCT/CN2023/096474
Authority: WO
Inventors: 朱景龙; 李俊玮; 张德朝
Original assignee: 中国移动通信有限公司研究院; 中国移动通信集团有限公司
Priority date: 2022-05-27
Filing date: 2023-05-26
Publication date: 2023-11-30
Also published as: CN117177104A

Abstract

The present disclosure provides an information feedback method, a device, and a storage medium. The method comprises: an OLT feeds back fourth information to an ONU according to at least one of first information, second information of the ONU and third information when determining that the effective bandwidth and/or delay do not meet the requirements.

Description

An information feedback method, device and storage medium

Cross-references to related applications

This application claims priority to Chinese Patent Application No. 202210593206.4 filed in China on May 27, 2022, the entire content of which is incorporated herein by reference.

Technical field

The present disclosure relates to the field of communication technology, and in particular to an information feedback method, device and storage medium.

Background technique

In recent years, network delay performance has attracted more and more attention and has gradually become a new hot topic in the communications industry. Low-latency networks have also become a network development direction that operators are paying attention to.

Passive Optical Network (PON) has become the mainstream technology of optical access network. With the continuous improvement of optical distribution network (Optical Distribution Network, ODN) network coverage, PON network has become the first choice for user business access. kilometers, it is necessary to meet different network access carrying requirements of different services at the same time. With the in-depth development of "digital transformation" and "network power", telecommunications networks have begun to be deeply integrated with all walks of life. Some emerging industries and emerging services have put forward almost demanding demands on network latency, and some demands have even reached the level of existing ones. The extent that optical access network technology and networking structure cannot satisfy.

With the development of the domestic industrial Internet, factories have emerging business needs for machine vision quality inspection, equipment collaborative operations, equipment fault diagnosis, production site inspection and other scenarios. Compared with traditional PON access networks based on copper wires (twisted pairs, network cables) The industrial Internet technology has obvious advantages: anti-interference, easy deployment, easy expansion, long transmission distance without relay, etc. PON equipment can be deployed in workshops and factory scenarios in industrial production networks to carry industrial production, monitoring and office data services. Different industrial applications have different requirements for bearer networks. In different scenarios, the bandwidth requirements and response time requirements are different. For field-level network applications, the low latency and low jitter characteristics of the bearer network will be very critical requirements. The requirements for latency and jitter can be to millisecond level or even sub-millisecond level. Therefore, it is very necessary to conduct in-depth analysis of low-latency business requirements and further study Low-latency optimization technology for optical access networks to better meet the needs of these low-latency services.

The shortcoming of the related technology is that the solution used to ensure that the optical network unit (Optical Network Unit, ONU) can be accessed cannot effectively reduce the average uplink burst transmission delay.

Contents of the invention

The present disclosure provides an information feedback method, device and storage medium to solve the problem that the solution used to ensure that the access of new ONUs can be allowed cannot effectively reduce the average uplink burst transmission delay.

This disclosure provides the following technical solutions:

An information feedback method, including:

When the OLT determines that the effective bandwidth and/or delay does not meet the requirements based on at least one of the first information, the ONU's second information, and the third information, it feeds back the fourth information to the ONU.

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

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

During implementation, the method also includes:

The OLT receives the second information sent by the ONU.

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

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

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

The OLT receives the second information reported by the ONU;

And/or, the OLT receives the second information sent by the ONU according to the requirements of the OLT.

During implementation, the method also includes:

The OLT also receives the first identification reported by the ONU, and the first identification is used to indicate whether the ONU is adjustable.

During implementation, the method also includes:

The OLT at least obtains the third information based on the second information of the ONU;

The determination that the effective bandwidth and/or delay does not meet the requirements includes:

The OLT determines that the effective bandwidth and/or delay does not meet the requirements based on the first information and the third information.

In implementation, the bandwidth map (BWmap) calculation result of the OLT is obtained based on at least the first information of the OLT and/or the second information of the ONU.

In implementation, the OLT obtains third information based on at least the second information of the ONU, including:

The BWmap in the OLT is calculated based on at least the second information of the ONU, and uses all the results of the calculation results, or part of the results, or the processed results of all or part of the results as the third information.

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

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

During implementation, the fourth information fed back to the ONU includes:

Feed back the fourth information to the ONU for adjustment by the ONU.

During implementation, the method also includes:

When the number of judgments exceeds M, the OLT modifies the first information;

Among them, M is an integer greater than 0.

An OLT includes:

Processor, used to read the program in the memory and perform the following processes:

According to at least one of the first information, the ONU's second information and the third information, when it is judged that the effective bandwidth and/or delay does not meet the requirements, feed back the fourth information to the ONU;

Transceiver, used to receive and send data under the control of a processor.

Implementation also includes:

Receive the second information sent by the ONU.

Receive the second information reported by the ONU;

And/or, receive the second information sent by the ONU according to the requirements of the OLT.

Implementation also includes:

It also receives a first identification reported by the ONU, where the first identification is used to indicate whether the ONU is adjustable.

Implementation also includes:

At least obtain the third information based on the second information of the ONU;

According to the first information and the third information, it is determined that the effective bandwidth and/or delay do not meet the requirements.

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

During implementation, at least the third information is obtained based on the second information of the ONU, including:

During implementation, the fourth information fed back to the ONU includes:

Feed back the fourth information to the ONU for adjustment by the ONU.

During implementation, the method also includes:

When the number of judgments exceeds M, the OLT modifies the first information;

Among them, M is an integer greater than 0.

An OLT includes:

The feedback module is configured to feed back fourth information to the ONU when it is determined that the effective bandwidth and/or delay does not meet the requirements based on at least one of the first information, the second information of the ONU, and the third information.

Implementation also includes:

The first receiving module is used to receive the second information sent by the ONU.

In implementation, the first receiving module is further used to receive the capability information sent by the ONU, including:

Receive the second information reported by the ONU;

Implementation also includes:

The second receiving module is used by the OLT to also receive the first identification reported by the ONU, where the first identification is used to indicate whether the ONU is adjustable.

Implementation also includes:

An information module, used to obtain the third information based on at least the second information of the ONU;

The feedback module is further used to include: when it is judged that the effective bandwidth and/or delay does not meet the requirements:

In implementation, the information module is further used to obtain the third information based on at least the second information of the ONU, including:

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

Feed back the fourth information to the ONU for adjustment by the ONU.

Implementation also includes:

A modification module configured to modify the first information by the OLT when the number of judgments exceeds M;

Among them, M is an integer greater than 0.

A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the above-mentioned information feedback method is implemented.

The beneficial effects of this disclosure are as follows:

In the technical solution provided by the embodiment of the present disclosure, the DBA algorithm currently applied to single-frame multi-burst systems only considers the maximum available bandwidth parameter. The guard intervals between adjacent ONUs are usually the same, and the ONU with the worst performance requires The guard interval is used as the benchmark, and joint optimization of throughput and delay cannot be achieved. Therefore, based on at least one of the first information, the second information of the ONU, and the third information, when the OLT determines that the effective bandwidth and/or delay does not meet the requirements, the OLT feeds back the fourth information to the ONU.

Since the second information of ONU is introduced in the DBA calculation process (for example, it can be ONU equipment information/capability information, etc.), so that the delay and bandwidth can be balanced in a targeted manner according to the real-time situation of the ONU, so that the low-latency system applied by the solution provided by the embodiment of the present disclosure can reduce the delay while Improve bandwidth utilization;

Since the third information here can be a bandwidth value or delay value calculated based on the current parameter situation, embodiments of the present disclosure can compare the calculated bandwidth value or delay value with the target value of the first information, thereby dynamically Adjust latency and bandwidth to reduce latency while improving bandwidth utilization.

Furthermore, the physical layer capabilities reported by each ONU can be used, and the OLT uses the minimum bandwidth tolerance and the physical layer capabilities reported by each ONU as input parameters for BWmap calculation to determine the time slot allocation of each ONU in the uplink frame. Due to the increase in the system minimum The bandwidth tolerance (R _m ) and the physical layer capability of each ONU are used as input parameters for BWmap calculation, because it is meaningful to reduce the delay only under this premise. Furthermore, because the physical layer capability of the ONU can be sensed, it can be based on each ONU. The actual situation of each ONU is used to determine the protection interval between adjacent ONUs, so that the protection time interval required for each ONU can be determined to be optimized, and the bandwidth utilization rate is improved.

Description of the drawings

The drawings described here are used to provide a further understanding of the present disclosure and constitute a part of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the attached picture:

Figure 1 is a schematic flow chart of the implementation of the information feedback method on the OLT side in an embodiment of the present disclosure;

Figure 2 is a schematic diagram of multiple bursts in a single frame in an embodiment of the present disclosure;

Figure 3 is a schematic block diagram of DBA calculation in an embodiment of the present disclosure;

Figure 4 is a schematic diagram of low-latency and deterministic-latency ONU time slot allocation in an embodiment of the present disclosure;

Figure 5 is a schematic diagram of the interaction mechanism of ONU reporting capabilities to OLT in an embodiment of the present disclosure;

Figure 6 is a schematic diagram of the interaction mechanism of OLT processing and result delivery to ONU in an embodiment of the present disclosure;

Figure 7 is a schematic structural diagram of an OLT in an embodiment of the present disclosure.

Detailed ways

The inventor noticed during the invention process:

In order to ensure that the new optical network unit (Optical Network Unit, ONU) can be allowed to access, the optical line terminal (Optical Line Terminal, OLT) will regularly open a silent window. During this period, the online ONU is not allowed to send uplink data, only unused data. Registered ONUs are allowed to send registration request messages. Since the ONU distance allowed by a typical PON system needs to cover 0 to 20km, the round-trip delay difference in transmission over optical fiber reaches 200 microseconds. Therefore, during the ONU registration phase, the silent window size is usually 250 microseconds in length. In addition to registration, when the ONU needs ranging, the OLT also needs to use the uplink silent window to complete it. Since the registration/ranging window does not allow normal ONUs to send uplink data, and if the ONU has uplink services that need to be sent at this time, it can only wait for the end of the silent window before sending. Therefore, the PON system's registration/ranging window introduces additional latency, which is typically 250 microseconds.

In order to avoid the additional delay and jitter introduced by registration/ranging windowing, an effective method is to introduce an additional wavelength channel. Both OLT and ONU have two upstream channels, one of which is used for normal services and management; the other is used for registration/ranging. At the same time, the registration/ranging channel can also be used to send uplink services. In this system, there are 2 uplink wavelength channels and 1 downlink wavelength channel. The uplink and downlink use different wavelengths and share the same ODN network through wavelength division multiplexing. The sending of ONU activation response messages and the sending of user data after ONU activation and online can be flexibly configured according to business needs. For example, the first uplink channel is configured as activation + user data sending (at this time, this channel is an uplink with a large delay). channel, mainly used to transmit delay-insensitive user data or services), and the second uplink channel is configured to only send and receive user data (this uplink channel is a low-latency uplink channel, used to transmit delay-sensitive user data or services) service), or conversely, the first uplink channel is configured to only transmit and receive 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 the two uplink transmission channels, corresponding information exchange may be required between the two Dynamic Bandwidth Allocation (DBA) scheduling modules of the OLT to achieve uplink bandwidth. Scheduling optimization. The upstream bandwidth authorization of the two upstream channels can be allocated by the bandwidth map (Bwmap) in the same downlink channel.

This method can only reduce the maximum delay, but has very little impact on reducing the average delay.

As can be seen from the above solution, the impact of the registration/ranging window can be completely eliminated by adding additional upstream wavelength channels. Both ONU and OLT need to add an additional wavelength channel, and additional logic processing chips are also required to complete 2 upstream Co-scheduling of wavelength channels. Therefore, the program It will introduce a certain cost increase and require changes to the hardware of single boards and modules. Current conventional PON system hardware cannot support this function. It can be seen from the above analysis that the conventional silent window size is 250 microseconds. The most critical factor is that the distance difference between the farthest and nearest ONU that may appear in the system is 20km. However, in actual PON network deployment, this situation does not occur. For ONUs under the same PON port, the distance between their trunk optical fibers is the same, and the distance difference is mainly reflected in the branch optical fibers. For specific scenarios, such as 5G transport or industrial field applications, the differences in optical fibers of different ONU branches under the same PON port are controllable. Taking the maximum distance difference of branch fibers as 1km under a single PON port as an example, the round-trip delay difference of its transmission on the fiber is about 10 microseconds. If the window is still opened according to the conventional method, the ONU random delay will be 48 microseconds and the ONU response time difference will be 48 microseconds. 2 microseconds, then the window size of 60 microseconds can meet the requirements. Through this method of opening a small window, the original additional delay of 250 microseconds can be reduced to 60 microseconds without increasing hardware resources.

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

Both of the above solutions are aimed at eliminating or reducing the silent window time to reduce latency. However, the number of times the silent window is opened is about once per second, so the above solution will hardly reduce the average latency.

Based on this, embodiments of the present disclosure propose a passive optical network uplink time slot allocation scheme that supports low latency and deterministic latency, which can effectively reduce uplink burst transmission latency and achieve deterministic latency transmission. and improve bandwidth utilization.

Specific implementations of the present disclosure will be described below with reference to the accompanying drawings.

During the explanation process, the implementation will be explained from the OLT and ONU sides respectively, and then an example of the two's coordinated implementation will be given to better understand the implementation of the solution given in the embodiment of the present disclosure. This way of explanation does not mean that the two must be implemented together or separately. In fact, when OLT and ONU are implemented separately, they each solve their own problems, and when they are used together, they will get better results. Good technical effect.

Figure 1 is a schematic diagram of the implementation process of the information feedback method on the OLT side. As shown in the figure, it can include:

Step 101: Based on at least one of the first information, the ONU's second information, and the third information, the OLT feeds back the fourth information to the ONU when it determines that the effective bandwidth and/or delay does not meet the requirements.

In implementation, the effective bandwidth and/or delay here may also be referred to as available bandwidth and/or delay. this The ONU in can be one ONU or multiple ONUs, and can feed back to one ONU or multiple ONUs. When the OLT is connected to multiple ONUs, the feedback of the fourth information to the ONU may be: feedback of the fourth information to one, part or all of the multiple ONUs.

The first information here may be pre-configured. The first information can also be reset or modified later. The function of the first information here is actually a target value or threshold, which is used to compare with the actual value to determine whether the current demand can be met.

Since the second information of the ONU is introduced in the DBA calculation process (specifically, it can be the device information/capability information of the ONU, etc.), the delay and bandwidth can be balanced in a targeted manner according to the real-time situation of the ONU, making the embodiment of the present disclosure The low-latency system applied by the provided method can improve bandwidth utilization while reducing latency.

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

The OLT determines the minimum bandwidth tolerance and receives the physical layer capabilities reported by each ONU, where the minimum bandwidth is the minimum available bandwidth expected to be achieved;

The minimum bandwidth tolerance and the physical layer capabilities reported by each ONU are used as input parameters for BWmap calculation to determine the time slot allocation of each ONU in the uplink frame.

In a Time Division Multiplexing (TDM) PON system, the upstream uses a Time Division Multiple Access (TDMA) multiplexing mechanism. The OLT is responsible for allocating and scheduling the uplink transmission time slot window of the ONU. The ONU can only send uplink data within the time slot allocated by the OLT. Since the PON system is a point-to-multipoint physical topology connection, the receiving time slots of the OLT need to be reasonably allocated to all ONUs. For a specific ONU, its uplink time slot window is limited. The period from the end of a certain uplink time slot to the beginning of the next time slot belongs to the sending time slots of other ONUs. This specific ONU cannot send any uplink data. , the data that needs to be sent during this period will be cached locally in the ONU and wait for the next time slot to arrive before sending. Therefore, the upstream time slot interval has a greater impact on the upstream delay of the ONU. In the International Telecommunication Union (International In the TDM PON system of the Telecommunication Union (ITU) system, the uplink time slot allocation message of the ONU is located in the BWmap (i.e., bandwidth mapping) with a fixed overhead in the header of each downlink frame. Each BWmap can complete the 125 corresponding to the downlink frame. Microsecond uplink time slot allocation. In each frame, each ONU has only one transmission time slot. At this time, if the ONU's uplink service happens to arrive and the transmission time slot has just happened or has passed, the service needs to wait for the arrival of the next time slot, which will cause additional uplink traffic. Latency cannot meet scenarios and services that have high requirements on latency and jitter (industrial PON, 5G small station backhaul, and cloud virtual reality technology (Virtual Reality, VR) services, etc.). Therefore, there is an urgent need to introduce new technologies to optimize uplink time. extension.

Specifically, the first information here represents the minimum effective bandwidth, which can also be understood as indicating the minimum available bandwidth, etc. Specifically, it can be called minimum bandwidth tolerance (Minimum effective bandwith, Minimum available bandwith, Minimum tolerance bandwidth, or Minimum distributable bandwidth). It refers to the fact that when the OLT allocates the upstream bandwidth to the ONU, the OLT can allocate it to the downstream bandwidth every time it performs DBA. The minimum available bandwidth of all ONUs, which is the bandwidth used to transmit Ethernet messages or the bandwidth to transmit GPON encapsulation mode (G-PON Encapsulation Mode, GEM; GPON: Gigabit-capable PON) frames, or called It is the minimum tolerated bandwidth, or minimum bandwidth utilization, or minimum bandwidth threshold, etc. For example, the line rate is 10Gbps. When the first information is the effective/available bandwidth, the first information can be specifically a line rate value, for example, 6Gbps; when the first information is the minimum bandwidth utilization, the first information can be specifically: A percentage, such as 60%.

Of course, the first information here can also represent the non-effective bandwidth, and the OLT obtains the minimum effective bandwidth through the non-effective bandwidth. For example, the line rate is 10Gbps. When the first information is an ineffective bandwidth, the first information can be a line rate value, for example, 4Gbps. Then, the OLT can obtain the minimum effective bandwidth based on the line rate and the ineffective bandwidth. 6Gbps; when the first information is the ineffective bandwidth utilization, the first information can be specifically a percentage, such as 40%, and then the OLT can obtain the minimum bandwidth utilization of 60% based on the line rate and the ineffective bandwidth.

Implementation may also include:

The OLT receives the second information sent by the ONU.

Specifically, the ONU may send the second information periodically, may send the second information continuously, may send the second information at intervals, or may send the second information based on an event trigger.

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

Specifically, the device information of the ONU here may specifically be the device capability information of the ONU, which is used to represent the device capability of the ONU. It is not difficult to understand that the equipment capabilities of ONUs can change over time. For example, the equipment capabilities of ONUs are the best when they leave the factory. As the use time increases, their equipment capabilities will gradually deteriorate. In the embodiment of the present disclosure, the device information of the ONU sent by the ONU received by the OLT can be understood as the current device capability of the ONU. In other words, since the device capability changes over time, the ONU needs to send the current device capability to the OLT multiple times or periodically, so that the OLT can determine whether the bandwidth and bandwidth requirements are met based on the ONU's real-time device capability. / Or delay requirements, and then be able to dynamically balance delay and bandwidth to maximize the bandwidth utilization of the system.

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

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

The OLT receives the second information reported by the ONU;

Specifically, the first case means that the ONU actively reports capability information to the OLT, and the second case means that the ONU sends the capability information according to the OLT's requirements and/or requests. These two situations can exist only one way or at the same time. For example, the ONU supports active reporting and also supports sending capability information according to the requirements or requests of the OLT.

Specific implementation may also include:

Implementation may also include:

Correspondingly, the judgment that the effective bandwidth and/or delay does not meet the requirements includes:

Specifically, judging based on the first information and the third information may actually be based on the first information and the third information. Compare the third information, that is, compare the calculated bandwidth and/or delay value with the target bandwidth and/or delay value, and then determine whether the requirement is met.

When calculating the third information, the OLT may also consider other parameters in addition to the second message reported and/or sent by the ONU. For example, the number of ONUs can be specifically the number of online ONUs connected below; another example is the response time of the transimpedance amplifier (TIA) and limiting amplifier in the OLT.

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

In specific implementation, the OLT obtains third information based on at least 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 adjustable second information of the ONU means that the second information reported by the ONU is adjustable for the OLT. For example, the shortest ON time of the ONU laser is N, and the ONU reports the information that the shortest ON time of the laser is N to the OLT. When the OLT learns that the ONU is an adjustable ONU (it does not necessarily have to determine whether the ONU is adjustable), It may also be adjustable by default). In subsequent adjustments, the ONU can be controlled to adjust within a range greater than or equal to N.

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

During implementation, the fourth information fed back to the ONU includes:

Feed back the fourth information to the ONU for adjustment by the ONU.

Implementation may also include:

When the number of judgments exceeds M, the OLT modifies the first information;

Where M is an integer greater than 0.

Specifically, in actual situations, the following situation may occur: all ONUs connected to the OLT are in extreme working status, but after multiple judgments, they still cannot meet the bandwidth and/or delay threshold represented by the first information. This The system may be in a locked state. To avoid such a situation, Embodiments of the present disclosure may also include: when the number of judgments exceeds M (M is an integer greater than 0), in order to prevent a lockup situation, the OLT may modify the first information, that is, modify the bandwidth and/or represented by the first information. or delay threshold.

Figure 2 is a schematic diagram of multiple bursts in a single frame. The passive optical network uplink time slot allocation scheme proposed in the embodiment to support low latency and deterministic latency, as shown in Figure 2, is executed by the OLT based on the content reported by the ONU. The OLT determines the number of bursts for each ONU in a single frame based on the content reported by the ONU, thereby meeting the service requirements for delay τ. When each ONU has N uplink burst time slots every 125 microseconds, and the interval between each time slot is 125/N microseconds, the maximum delay is reduced to the original 1/N (N is a positive integer ). Optionally, when the burst position of each ONU remains unchanged in each frame, zero jitter is achieved. That is, during implementation, it may further include:

After determining the burst number of each ONU in a single frame, the burst position of each ONU in each frame remains unchanged or can be changed as needed.

In the TDM PON system, each burst packet sent by the ONU needs a certain preamble pattern, which is the so-called guard time interval. This preamble will occupy part of the uplink time slot and introduce a certain overhead. In each frame, the greater the number of bursts, the greater the total overhead introduced by the preamble. Therefore, the number of bursts in a single frame cannot be increased without limit, otherwise, the uplink bandwidth efficiency in the system will become very low; on the other hand, under a specific number of bursts, through adaptive optimization of the distance between adjacent bursts The guard interval can maximize the effective bandwidth. The protection interval is determined by the number of ONUs, the switching time of the ONU laser, the response time of the Avalanche Photodiode (APD) at the OLT end, the response time of the Transimpedance Amplifier (TIA) and the limiting amplifier. Therefore, the embodiment proposes a DBA calculation scheme for joint optimization of delay and bandwidth. The minimum bandwidth tolerance of the system and the physical layer capability of each ONU are included as new input parameters in the DBA calculation. The guard intervals of adjacent time slots can be based on The physical characteristics of the ONU to which the time slot is allocated are determined, eliminating the need to accommodate an ONU with worse performance, reducing the upstream delay and improving bandwidth utilization. The specific implementation can be as follows:

Figure 3 is a schematic block diagram of DBA calculation. As shown in the figure, in the PON system, the uplink time slot allocation of the ONU in each frame is calculated by the DBA in the OLT. The current DBA algorithm does not perceive the physical layer capabilities of each ONU, and only considers the maximum available bandwidth parameter. When this algorithm is applied to a single-frame multi-burst system, the guard intervals between adjacent ONUs are usually the same, and the worst-case performance ONU required to ensure Using the guard interval as the benchmark cannot achieve joint optimization of throughput and latency. Therefore, in the solution provided by the embodiment, the minimum bandwidth tolerance (Rm) of the system and the physical layer capability of each ONU are added as input parameters for BWmap calculation. The minimum bandwidth is the minimum available bandwidth expected to be achieved. Under this premise, the only way to reduce the delay is to meaningful. By sensing the physical layer capabilities of the ONU, the protection interval between adjacent ONUs can be determined based on the actual situation of each ONU. This can ensure that the protection time interval required for each ONU is optimized and improve bandwidth utilization. BWmap calculates the time slot allocation of each ONU in the uplink frame based on the input parameters. OAM in Figure 3 is Operation Administration and Maintenance.

During implementation, the physical layer capabilities reported by the ONU include one or a combination of the following capabilities:

The switching time of the ONU laser and the response time of the APD.

During implementation, the physical layer capabilities reported by each ONU are received through one of the following management channels or a combination thereof:

OMCI, TR069, PLOAM.

Among them, OMCI refers to the ONT Management and Control Interface (ONT Management and Control Interface); ONT refers to the Optical Network Terminal (Optical Network Terminal); TR069 refers to the user terminal equipment WAN management protocol; PLOAM refers to the physical layer operation management and maintenance ( Physical Layer Operations, Administration and Maintenance).

During implementation, the OLT side may further include:

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

Correspondingly, the ONU side has:

Receive the time slot allocation results notified by the OLT through the management channel.

During implementation, the OLT side may further include:

The physical layer capabilities reported by each ONU, the TIA in the OLT, the response time of the limiting amplifier, and the minimum bandwidth tolerance are used as input parameters for BWmap calculation to determine the uplink bandwidth allocation.

In specific implementation, after the uplink bandwidth allocation is determined, it further includes:

When the effective bandwidth does not meet the demand, each ONU is notified to adjust the corresponding physical layer parameters until it is determined that the effective bandwidth meets the demand, and the time slot allocation result is notified to each ONU through the management channel.

Correspondingly, the ONU side has:

After determining the uplink bandwidth allocation, further include:

Adjust the physical layer parameters according to the notification from the OLT, and receive the time slot allocation results notified by the OLT through the management channel.

The following is an example.

Figure 4 is a schematic diagram of low-latency and deterministic delay ONU time slot allocation. The low-latency and deterministic delay ONU time slot allocation scheme is shown in Figure 4. The ONU physical layer capability collection and control device is placed in the ONU, and the PON low-latency optimization device is deployed in the OLT. The ONU physical layer capability collection and control device, and the PON low-latency optimization device are all named for convenience of explanation. In specific practice, they can Set the appropriate devices as needed.

Figure 5 is a schematic diagram of the interaction mechanism of the ONU reporting capabilities to the OLT. As shown in the figure, the ONU physical layer capability collection and control device collects the ONU's own physical layer capabilities and reports them to the OLT through the management channel. The reporting capability at least includes the switching time of the ONU laser, the response time of the APD, etc. The reporting method is through the management channel, including but not limited to ONT Management and Control Interface (OMCI; ONT: Optical Network Terminal), user terminal equipment WAN management protocol (TR069) and physical layer operations Management and maintenance (Physical Layer Operations, Administration and Maintenance, PLOAM), etc. The ONU physical layer capability collection and control device autonomously adjusts the physical layer parameters of the ONU by receiving the feedback results from the PON low-latency optimization device. The ONU automatically adjusts the physical layer parameters of the ONU by parsing the messages in the downstream management channel (including but not limited to OMCI, PLOAM or TR069, etc.) , obtain the uplink transmission time slot, laser switching time and APD response time information, and adjust the laser switching time and APD response time as needed.

Figure 6 is a schematic diagram of the interaction mechanism of OLT processing and result delivery to ONU. As shown in the figure, it includes:

On the OLT side: The OLT reads the physical layer capabilities reported by the ONU, combines the capabilities collected from the ONU about the laser switching time and APD response time, and performs DBA optimization calculations:

If the ONU has the ability to adjust, the switching time of the ONU laser and the APD response time are input as parameters during the calculation process, and both are optimized.

If the ONU does not have the ability to adjust, the switching time and APD response time of the ONU laser will not be changed during the calculation process.

Inform the ONU of the calculation results through the downstream management channel (including but not limited to OMCI, PLOAM or TR069).

On the ONU side: ONU analyzes downstream management channels (including but not limited to OMCI, PLOAM Or the message in TR069) to obtain the uplink transmission time slot, laser switching time and APD response time information.

Specifically, the PON low-latency optimization device senses the ability of the ONU to report, the TIA in the OLT, and the response time of the limiting amplifier, and reports the above parameters together with the system's minimum bandwidth tolerance to Bwmap to calculate the uplink bandwidth allocation. The PON low-latency optimization device senses the BWmap feedback results and uses them for the current calculation, and determines whether the effective bandwidth and delay at this time meet the requirements. If not, it feeds back to the ONU to adjust the corresponding physical layer parameters and sends them to the OLT for recalculation. . Repeat the above steps until the time slot allocation result that meets the required delay and jitter is obtained, and inform each ONU of the time slot allocation result through the management channel.

Based on the same inventive concept, embodiments of the present disclosure also provide an OLT and a computer-readable storage medium. Since the principles of solving problems of these devices are similar to the time slot allocation method, the implementation of these devices can be referred to the implementation of the method. The repetitive parts will not be repeated.

When implementing the technical solution provided by the embodiments of the present disclosure, it can be implemented in the following manner.

Figure 7 is a schematic diagram of the OLT structure. As shown in the figure, the OLT includes:

The processor 700 is used to read the program in the memory 720 and perform the following processes:

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

Implementation also includes:

Receive the second information sent by the ONU.

Receive the second information reported by the ONU;

Implementation also includes:

The BWmap in the OLT calculates at least the third information based on the second information of the ONU, and uses all the results of the calculation results, or part of the results, or the processed results of all or part of the results as the third information.

During implementation, the fourth information fed back to the ONU includes:

Feed back the fourth information to the ONU for adjustment by the ONU.

During implementation, the method also includes:

When the number of judgments exceeds M, the OLT modifies the first information;

Among them, M is an integer greater than 0.

In FIG. 7 , the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 700 and various circuits of the memory represented by memory 720 are linked together. The bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are all well known in the art and therefore will not be described further herein. The bus interface provides the interface. Transceiver 710 may be a plurality of elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium. The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 can store data used by the processor 700 when performing operations.

The embodiment of the present disclosure also provides an OLT, including:

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

Implementation also includes:

Receive the second information reported by the ONU;

Implementation also includes:

In implementation, the feedback module is further used to obtain the bandwidth mapping BWmap calculation result of the OLT based on at least the first information of the OLT and/or the second information of the ONU.

Feed back the fourth information to the ONU for adjustment by the ONU.

Implementation also includes:

Among them, M is an integer greater than 0.

For the convenience of description, each part of the above-described device is divided into various modules or units by function and described separately. Of course, when implementing the present disclosure, the functions of each module or unit can be implemented in the same or multiple software or hardware.

Embodiments of the present disclosure also provide a computer-readable storage medium that stores a computer program. When the computer program is executed by a processor, the above-mentioned information feedback method is implemented.

For specific implementation, please refer to the implementation of the above information feedback method.

To sum up, the embodiments of the present disclosure provide a passive optical network uplink time slot allocation scheme that supports low latency and deterministic latency, a DBA algorithm that supports joint optimization of latency and effective bandwidth, and a low-latency PON on the OLT side. Delay optimization solution, ONU physical layer capability collection and control solution on the ONU side, and an interactive mechanism that supports ONU guard interval capability reporting.

For scenarios sensitive to delay and jitter such as industrial and 5th Generation Mobile Communication Technology ( ^5th Generation Mobile Communication Technology, 5G) small station backhaul, the proposed jointly optimized DBA calculation is used to reduce delay and improve effective bandwidth. Method to achieve low-latency, zero-jitter transmission effects.

Those skilled in the art will appreciate that embodiments of the present disclosure may be provided as methods, systems, or computer program products. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment that combines software and hardware aspects. Furthermore, the present disclosure 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) embodying computer-usable program code therein.

The disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes 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 device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device produce a use A device for realizing the functions specified in one process or multiple processes of the flowchart and/or one block or multiple blocks of the block diagram.

These computer program instructions may also be stored in a computer or other programmable data processing device that A computer-readable memory configured to operate in a specific manner such that instructions stored in the computer-readable memory produce an article of manufacture including instruction means implemented in a process or processes of a flowchart and/or a method of a block diagram A function specified in a box or boxes.

These computer program instructions may also be loaded onto a computer or other programmable data processing device, causing a series of operating steps to be performed on the computer or other programmable device to produce computer-implemented processing, thereby executing on the computer or other programmable device. Instructions provide steps for implementing the functions specified in a process or processes of a flowchart diagram and/or a block or blocks of a block diagram.

Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the spirit and scope of the disclosure. In this way, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and equivalent technologies, the present disclosure is also intended to include these modifications and variations.

Claims

An information feedback method, including:

The optical line terminal OLT feeds back the fourth information to the ONU when it determines that the effective bandwidth and/or delay does not meet the requirements based on at least one of the first information, the second information of the optical network unit ONU, and the third information.
The method of claim 1, further comprising:

The OLT at least obtains the third information based on the second information of the ONU;

The determination that the effective bandwidth and/or delay does not meet the requirements includes:

The OLT determines that the effective bandwidth and/or delay does not meet the requirements based on the first information and the third information.
The method according to claim 2, wherein the bandwidth map BWmap calculation result of the OLT is obtained based on at least the first information of the OLT and/or the second information of the ONU.
The method according to claim 2, wherein the OLT obtains the third information based on at least the second information of the ONU, including:

The bandwidth map BWmap in the OLT is calculated based on at least the second information of the ONU, and uses all the results of the calculation results, or part of the results, or the processed results of all or part of the results as the third information.
The method of claim 4, wherein the third information is a bandwidth value and/or a delay value.
The method according to claim 1, wherein the first information is used to represent a minimum effective bandwidth and/or is used to represent a required maximum delay.
The method according to claim 1 or 6, wherein the first information is a minimum bandwidth tolerance and/or a maximum delay requirement.
The method of claim 1, further comprising:

The OLT receives the second information sent by the ONU.
The method according to claim 8, wherein the second information of the ONU is device information of the ONU.
The method according to claim 9, wherein the device information of the ONU is physical capability information of the ONU.
The method according to claim 1, wherein the OLT receives the capability information sent by the ONU, including:

The OLT receives the second information reported by the ONU;

And/or, the OLT receives the second information sent by the ONU according to the requirements of the OLT.
The method of claim 11, further comprising:

The OLT also receives the first identification reported by the ONU, and the first identification is used to indicate whether the ONU is adjustable.
The method according to claim 1, wherein the second information of the ONU is adjustable or non-adjustable information.
The method according to claim 1, wherein the feedback of fourth information to the ONU includes:

Feed back the fourth information to the ONU for adjustment by the ONU.
The method of claim 1, further comprising:

When the number of judgments exceeds M, the OLT modifies the first information;

Among them, M is an integer greater than 0.
An OLT includes:

Processor, used to read the program in the memory and perform the following processes:

According to at least one of the first information, the second information of the ONU and the third information, when it is judged that the effective bandwidth and/or delay does not meet the requirements, feed back the fourth information to the ONU;

Transceiver, used to receive and send data under the control of a processor.
An OLT includes:

The feedback module is configured to feed back fourth information to the ONU when it is determined that the effective bandwidth and/or delay does not meet the requirements based on at least one of the first information, the second information of the ONU, and the third information.
A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method of any one of claims 1 to 15 is implemented.