CN116095841B - Zero-latency scheduling method and device, electronic equipment and storage medium - Google Patents

Zero-latency scheduling method and device, electronic equipment and storage medium Download PDF

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CN116095841B
CN116095841B CN202310201393.1A CN202310201393A CN116095841B CN 116095841 B CN116095841 B CN 116095841B CN 202310201393 A CN202310201393 A CN 202310201393A CN 116095841 B CN116095841 B CN 116095841B
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time slot
cont
network unit
idle frames
idle
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CN116095841A (en
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刘微微
谈杰
许明
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Tianjin Kepu Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1221—Wireless traffic scheduling based on age of data to be sent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The application discloses a zero-latency scheduling method, a zero-latency scheduling device, electronic equipment and a storage medium, which are applied to local side equipment of a communication network, wherein the communication network further comprises a network unit, and the zero-latency scheduling method comprises the following steps: and allocating an initial time slot for the uplink burst sent by the T-CONT of the network unit according to the T-CONT parameter of the network unit, and adjusting the time slot allocated to the network unit according to the IDLE frame numbers of the head and tail of the uplink burst on the basis of the initial time slot until the time slot allocated to the network unit can enable only one IDLE frame to exist at the head and tail of each uplink burst, so that the time slot allocated to the T-CONT is obtained, and the time slot is sent to the T-CONT through BWMAP. And the T-CONT transmits an uplink burst through a time slot allocated by the local side equipment, the head of the uplink burst is provided with an IDLE frame, and when the uplink burst is transmitted, all messages in the uplink burst frame cannot reside in a network unit, so that zero-waiting scheduling is realized.

Description

Zero-latency scheduling method and device, electronic equipment and storage medium
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a zero-latency scheduling method, device, electronic device, and storage medium.
Background
In broadband access technology, a communication network generally adopts a point-to-multipoint communication mechanism, and downlink service data is transmitted through broadcasting. The behavior on the communication network enables each network unit to obtain the maximum bandwidth under the premise of fairness, and a DBA algorithm is introduced, but the existing DBA algorithm cannot realize zero buffer time of a message on the network unit, namely zero-waiting scheduling cannot be realized.
Disclosure of Invention
In view of the above problems, the present application provides a zero-latency scheduling method, apparatus, electronic device, and storage medium, which can solve the above problems.
In a first aspect, an embodiment of the present application provides a zero-latency scheduling method, which is applied to a local side device of a communication network, where the communication network further includes a network element, and the method includes: allocating an initial time slot for an uplink burst sent by the T-CONT of the network unit according to the T-CONT parameter of the network unit, and issuing the initial time slot to the T-CONT of the network unit through a BWMAP table, wherein the T-CONT parameter at least comprises a bandwidth parameter; detecting the number of IDLE frames at the head and tail of the uplink burst; based on the initial time slot, the time slot of the T-CONT allocated to the network unit is adjusted according to the number of the IDLE frames at the head and the tail of the uplink burst until the time slot of the T-CONT allocated to the network unit causes only one IDLE frame at the head and the tail of each uplink burst, so as to obtain the time slot of the T-CONT allocated to the network unit; the time slot is transmitted to the T-CONT of the network element through BWMAP.
In a second aspect, an embodiment of the present application provides a zero-latency communication method, which is applied to a communication network, where the communication network includes a local side device and a network element, and the method includes: the local side equipment allocates an initial time slot for an uplink burst sent by the T-CONT of the network unit according to the T-CONT parameter of the network unit, and sends the initial time slot to the T-CONT of the network unit through a BWMAP table, wherein the T-CONT parameter at least comprises a bandwidth parameter; the local side equipment detects the number of IDLE frames at the head and tail of the uplink burst; the local side equipment adjusts the time slot of the T-CONT allocated to the network unit according to the number of the IDLE frames at the head and the tail of the uplink burst on the basis of the initial time slot until the time slot of the T-CONT allocated to the network unit enables only one IDLE frame at the head and the tail of each uplink burst to obtain the time slot of the T-CONT allocated to the network unit; the local side equipment sends the time slot to the T-CONT of the network unit through BWMAP; and the network unit receives the time slot sent by the local side equipment and sends an uplink burst to the local side equipment according to the time slot.
In a third aspect, an embodiment of the present application provides a communication network, where the communication network includes a local side device and a network element. The local side equipment is used for distributing an initial time slot for an uplink burst sent by the T-CONT of the network unit according to the T-CONT parameter of the network unit, and distributing the initial time slot to the T-CONT of the network unit through a BWMAP table, wherein the T-CONT parameter at least comprises a bandwidth parameter; the local side equipment is also used for detecting the number of IDLE frames at the head and tail of the uplink burst; the local side equipment is further configured to adjust, based on the initial time slot, time slots allocated to the T-CONT of the network element according to the number of IDLE frames at the head and tail of the uplink burst until the time slots allocated to the T-CONT of the network element make only one IDLE frame at the head and tail of each uplink burst, so as to obtain the time slots allocated to the T-CONT of the network element; the local side equipment is further configured to send the time slot to a T-CONT of the network element through BWMAP; the network unit is configured to receive a time slot sent by the local side device, and send an uplink burst to the local side device according to the time slot.
In a fourth aspect, an embodiment of the present application provides a zero-latency scheduling apparatus, which is applied to a local side device of a communication network, where the communication network further includes a network element, and the apparatus includes: an initial time slot allocation module, an IDLE detection module, a time slot adjustment module and a time slot sending module. An initial time slot allocation module, configured to allocate an initial time slot for an uplink burst sent by a T-CONT of the network unit according to a T-CONT parameter of the network unit, and send the initial time slot to the T-CONT of the network unit through a BWMAP table, where the T-CONT parameter at least includes a bandwidth parameter; an IDLE detection module, configured to detect the number of IDLE frames at the head and tail of the uplink burst; the time slot adjusting module is used for adjusting the time slots of the T-CONT allocated to the network unit according to the IDLE frame numbers of the head and the tail of the uplink burst on the basis of the initial time slot until the time slots of the T-CONT allocated to the network unit enable the head and the tail of each uplink burst to have only one IDLE frame, so as to obtain the time slots of the T-CONT allocated to the network unit; and the time slot sending module is used for sending the time slot to the T-CONT of the network unit through BWMAP.
In a fifth aspect, embodiments of the present application provide an electronic device, including: one or more processors; a memory; one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, the one or more applications configured to perform the above-described method.
In a sixth aspect, embodiments of the present application provide a computer readable storage medium having program code stored therein, the program code being callable by a processor to perform the above method.
In a seventh aspect, embodiments of the present application provide a computer program product comprising instructions, wherein the computer program product has instructions stored therein, which when run on a computer, cause the computer to implement the above method.
It can be seen that, in the embodiment of the present application, an initial time slot may be allocated to an uplink burst sent by a T-CONT of a network element according to a T-CONT parameter of the network element, then, based on the initial time slot, the time slots allocated to the T-CONT of the network element are adjusted according to the number of IDLE frames at the head and tail of the uplink burst until the time slots allocated to the T-CONT of the network element can have only one IDLE frame at the head and tail of each uplink burst, so as to obtain the time slots allocated to the T-CONT of the network element, and finally, the time slots are sent to the T-CONT of the network element by BWMAP. The T-CONT of the network unit sends an uplink burst through a time slot allocated by the local side equipment, the head of the uplink burst is provided with an IDLE frame, which indicates that a message entering the network unit from a UNI port of the network unit does not reside in the network unit, and the tail of the uplink burst is provided with an IDLE frame, which indicates that the message entering the network unit from the UNI port of the network unit is all sent, namely, all the messages in the uplink burst frame do not reside in the network unit, and zero waiting of the uplink burst is scheduled in the network unit. The messages in the T-CONT of the network unit are scheduled by zero waiting, the uplink time delay is the same as the point-to-point direct connection delay, and the uplink time delay and the downlink time delay are the same as the downlink time delay, so that the symmetric uplink time delay and the downlink time delay with the lowest time delay required by an industrial scene are realized.
These and other aspects of the present application will be more readily apparent from the following description of the embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a network configuration diagram of a communication network;
fig. 2 shows a message transmission schematic diagram in a downlink direction of a communication network;
fig. 3 shows a schematic diagram of message transmission in an uplink direction of a communication network;
FIG. 4 is a flow chart illustrating a zero-latency scheduling method according to an embodiment of the present application;
FIG. 5 is a schematic diagram of an embodiment of the present application for providing uplink bursts;
FIG. 6 is a flow chart illustrating the adjustment of time slots according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of providing an uplink burst according to another embodiment of the present application;
fig. 8 shows a schematic application scenario provided in an embodiment of the present application;
Fig. 9 shows a schematic application scenario provided in another embodiment of the present application;
FIG. 10 shows a block diagram of a zero-latency scheduler provided by an embodiment of the present application;
FIG. 11 shows a block diagram of an electronic device according to an embodiment of the present application;
fig. 12 shows a block diagram of a computer-readable storage medium according to an embodiment of the present application.
Detailed Description
In order to enable those skilled in the art to better understand the present application, the following description will make clear and complete descriptions of the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application.
A communication network may consist of a local side device, a network element, such as network element 1, network element 2, …, network element n, etc., as well as a distribution network, typically in a point-to-multipoint network configuration, as in fig. 1, which provides a transmission medium for the physical connection between the local side device and the network element. If the communication network is a communication network (Passive Optical Network, PON), the distribution network may be an optical distribution network (Optical Distributio Network, ODN) composed of passive optical devices such as single-mode optical fibers, optical splitters, optical connectors, and the like. In the communication network system, data transmission in a downlink direction (from the local side device to the network units) adopts a broadcasting mode, and each network unit receives all frames respectively. PON networks have evolved for 3 generations, the first generation GPON, the second generation being 10G GPON, the third generation being 50G GPON, GPON and 10G GPON having been scaled up for commercial use, while 50G PON has been standardized, and the next generation of 50G-PON (possibly 200G-PON) is also being put into industry standard discussion in the ITU standard in the production development.
In the downstream direction of the communication network, the office device broadcasts a message to the network element, and the network element selects and receives a UNI interface to which the message is forwarded, as shown in fig. 2.
In the uplink direction of the communication network, the network unit sends a data message in the uplink direction, and the authorization of the local side equipment needs to be obtained, and the authorization of the local side equipment to the network unit is given to a time slot, and the network unit can send the message in the time slot. To ensure that messages between the splitter (i.e., the distribution network) and the backbone network element between the office-side devices do not collide, the messages are arranged sequentially, and the time slots allocated to the network elements by the office-side devices are staggered from each other, as shown in fig. 3. The network unit firstly caches the message received from the UNI, and after the time slot allocated to the network unit by the local side equipment arrives, the network unit sends the message in the time slot, and introduces large time delay for message transmission in the uplink direction of the communication network.
The communication network introduces a DBA algorithm in the upstream direction for letting each network element get the maximum bandwidth on the premise of fairness. At present, three kinds of DBA algorithms are mainly available, and the three kinds of DBA algorithms are respectively as follows:
1) SR-DBA: the network unit reports the buffer occupancy condition to the local side equipment through a message, and the DBA algorithm of the local side equipment calculates the bandwidth distributed to the network unit through the DBA algorithm according to the SR report value of the network unit and the bandwidth configuration value of the network unit and sends the bandwidth to the network unit through the BW-MAP.
2) TM-DBA: detecting the duty ratio of an uplink channel IDLE frame of a network unit, and then combining with configuration parameters of the uplink bandwidth of the network unit, calculating the bandwidth given to the network unit by the DBA, and then issuing the bandwidth to the network unit through a BW-MAP table.
3) CO-DBA, the local side equipment is externally connected with application equipment, the application sends scheduling information to the local side equipment, and the local side equipment DBA algorithm distributes uplink sending time slots to the network unit according to the application scheduling information. CO-DBA is mainly used for wireless transmission between BBU and AAU on the G.987.3 standard.
The SR-DBA and TM-DBA can be used independently or in combination to improve the performance of the DBA, i.e. to have each network element get a fair maximum bandwidth. The time delay aspect cannot achieve zero buffer time of the message on the network element, namely zero waiting scheduling. The CO-DBA is to apply the direct control DBA algorithm to allocate bandwidth to the network unit, so that the buffer time of the message on the network unit can be zero in principle, namely zero-waiting scheduling is realized, but the following 3 limitations lead to the fact that the CO-DBA cannot be used commercially:
(1) And the method is strongly bound with specific application, and needs the application to send scheduling information to the local side equipment, so as to control the DBA module of the local side equipment to allocate time slots to the network unit.
(2) The local side equipment and the application equipment need to be in butt joint by a special scheduling interface to transmit scheduling information. The industry has not yet applied devices to support scheduling interfaces.
(3) The time delay of the scheduling interface can influence the realization of zero-waiting scheduling of the local side equipment on the network unit, namely the distance between the local side equipment and the application equipment is required to be very short, the local side equipment and the application equipment are deployed in the same physical machine room, and few scenes can meet the constraint.
PON technology is used in an enterprise intranet from FTTH to replace a traditional ethernet switch, for example, in the field of industrial control, where PON uplink and downlink delays are required to be the same, and low delay is required, and delay is the same as that of point-to-point optical fiber direct connection, that is, PON uplink is required to achieve zero-latency scheduling. The industry has not addressed three constraints of CO-DBA, a commercially available zero-latency DBA algorithm.
In order to realize zero-latency scheduling, the inventor of the application finds out after careful study that the time slot of the T-CONT allocated to the network unit by the local side equipment can be adjusted according to the number of the IDLE frames at the head and the tail of the uplink burst of the network unit, so that the head and the tail of each uplink burst have 1 IDLE frame. When an uplink burst is sent, all messages in the uplink burst frame cannot reside in a network unit, so that zero-waiting scheduling is realized.
The following describes in detail, by means of specific embodiments, a zero-latency scheduling method, an apparatus, an electronic device, and a storage medium provided in the embodiments of the present application.
Referring to fig. 4, a flow chart of a zero-wait scheduling method according to an embodiment of the present application is shown. The method can be applied to each network element of a communication network that further includes a local side device. The following details about the flow shown in fig. 4, the zero-waiting scheduling method specifically may include steps S410 to S440:
step S410: and allocating an initial time slot for the uplink burst sent by the T-CONT of the network unit according to the T-CONT parameter of the network unit, and issuing the initial time slot to the T-CONT of the network unit through a BWMAP table, wherein the T-CONT parameter at least comprises a bandwidth parameter.
The T-CONT is a carrier for carrying the service in the uplink direction, all GEM PORTs are mapped into the T-CONT, and the local side equipment uplink in a DBA scheduling mode. T-CONT is the most basic control unit for the upstream traffic in the communication network. Each T-CONT is uniquely identified by an Alloc-ID. The Alloc-ID is globally assigned by the office device, i.e. each network element under the office device cannot use T-CONT with Alloc-ID repetition. There may be multiple T-CONTs on each network element, and each TCONT may bind multiple GEMPORT. Each network element supports multiple T-CONTs and may be configured for different traffic types. The T-CONT of the same type has different bandwidth allocation modes, and can meet different QoS requirements of different service flows on time delay, jitter, packet loss rate and the like. And the T-CONT uplink to the local side equipment side demodulates the GEM Port, then demodulates the service payload in the GEM Port, and carries out relevant service processing.
The communication network also defines a new transport convergence sublayer GTC, which serves as a general transport platform to carry various client signals (atm\gem). The GTC framing sublayer refers to a layer that is visible to all data transmitted in the communication network system, and the office device GTC framing sublayer and the network element GTC framing sublayer are directly peer-to-peer. In the downstream direction, the GTC frame is made up of a downstream physical control block (PCBd) and a GTC payload portion.
In the embodiment of the present application, the local side device may allocate an initial time slot for an uplink burst sent by the T-CONT of the current network element according to the T-COUT parameter of the network element. The time slot (including the initial time slot) allocated by the local side equipment for the network unit includes two parameters, namely a start time and a time slot length, wherein the start time is used for indicating when the T-CONT of the network unit transmits the uplink burst, and the time slot length is used for indicating how long the T-CONT of the network unit can transmit the uplink burst from the start time.
In some embodiments, the T-CONT parameters include at least the bandwidth parameters of the T-CONT and may also include the traffic cycle parameters.
Step S420: and detecting the number of IDLE frames at the head and tail of the uplink burst.
An IDLE frame is the content of an uplink burst except for carrying an uplink message (for carrying a client signal). The local side device in the embodiment of the present application may include an IDLE detection module, configured to detect the number of IDLE frames at the head and tail of the uplink burst.
Step S430: and on the basis of the initial time slot, adjusting the time slot of the T-CONT allocated to the network unit according to the number of the IDLE frames at the head and the tail of the uplink burst until the time slot of the T-CONT allocated to the network unit enables only one IDLE frame at the head and the tail of each uplink burst, and obtaining the time slot of the T-CONT allocated to the network unit.
In some embodiments, first, the header and the tail of the uplink burst sent by the T-CONT of the network element are detected to have several IDLE frames, and then the time slots allocated to the T-CONT of the network element are adjusted according to the number of IDLE frames of the header and the tail of the uplink burst. The steps of detecting the number of IDLE frames and adjusting the time slots are circularly performed until the time slots allocated to the network element are converged to only one IDLE frame at the head and tail of each uplink burst, and the uplink burst structure is shown in fig. 5.
Step S440: the time slot is transmitted to the T-CONT of the network element through BWMAP.
The T-CONT of the network unit sends an uplink burst through a time slot allocated by the local side equipment, the head of the uplink burst is provided with an IDLE frame, which indicates that a message entering the network unit from a UNI port of the network unit does not reside in the network unit, and the tail of the uplink burst is provided with an IDLE frame, which indicates that the message entering the network unit from the UNI port of the network unit is all sent, namely, all the messages in the uplink burst frame do not reside in the network unit, and zero waiting of the uplink burst is scheduled in the network unit. The messages in the T-CONT of the network unit are scheduled by zero waiting, the uplink time delay is the same as the point-to-point direct connection delay, and the uplink time delay and the downlink time delay are the same as the downlink time delay, so that the symmetric uplink time delay and the downlink time delay with the lowest time delay required by an industrial scene are realized.
In some embodiments, the above-mentioned procedure of adjusting the time slot of the T-CONT allocated to the network element according to the number of IDLE frames of the head and tail of the uplink burst on the basis of the initial time slot until the time slot of the T-CONT allocated to the network element is such that there is only one IDLE frame of the head and tail of each uplink burst can be referred to as shown in fig. 6.
First, it is determined whether the number of IDLE frames of the upstream burst header is 0, 1 or greater than 1. In some embodiments, the number of IDLE frames of the header may be noted as N1, and then it is determined whether n1=0, n1=1, or N1>1.
When the number of IDLE frames of the header is 0, that is, n1=0, the start time of the T-CONT slot allocated to the network element is advanced by one IDLE long time on the basis of the initial slot, so that the number of IDLE frames of the header is increased to 1. When the number of IDLE frames of the header is 1, that is, n1=1, the start time of the T-CONT slot allocated to the network element is kept unchanged from the start time of the initial slot, so that the number of IDLE frames of the header is kept 1. When the number of IDLE frames of the header is greater than 1, that is, N1>1, on the basis of the initial time slot, the start time of the T-CONT time slot allocated to the network element is shifted backward by one IDLE long time, so that the number of IDLE frames of the header is reduced by 1, the start time of the T-CONT time slot allocated to the network element at this time is taken as the start time of the initial time slot, and the steps of judging whether the number of IDLE frames of the header is 0, 1 or greater than 1 and thereafter are continuously performed until the number of IDLE frames of the header is 1.
In some exemplary embodiments, the time slot length of the T-CONT time slot allocated to the network element may be adjusted according to the IDLE frame number at the tail of the uplink burst, while the start time of the T-CONT time slot allocated to the network element is adjusted according to the IDLE frame number at the head of the uplink burst.
First, the number of IDLE frames at the tail of the uplink burst is determined to be 0, 1 or more than 1. In some embodiments, the number of IDLE frames at the tail may be denoted as N2, and then it is determined whether n2=0, n2=1, or N2>1. When the number of IDLE frames at the tail is 0, that is, n2=0, the slot length of the T-CONT slot allocated to the network element is increased by one IDLE long time on the basis of the initial slot, so that the number of IDLE frames at the tail is increased to 1. When the number of IDLE frames at the tail is 1, that is, n2=1, the slot length of the T-CONT slot allocated to the network element is kept constant as the slot length of the initial slot, so that the number of IDLE frames at the tail is kept to be 1. When the number of IDLE frames of the tail is greater than 1, that is, N2>1, on the basis of the initial time slot, the time slot length of the T-CONT time slot allocated to the network unit is shortened by one IDLE long time, so that the number of IDLE frames of the tail is reduced by 1, the time slot length of the T-CONT time slot allocated to the network unit at this time is taken as the time slot length of the initial time slot, and the steps of judging whether the number of IDLE frames of the tail is 0, 1 or greater than 1 and thereafter are continuously executed until the number of IDLE frames of the tail is 1.
Finally, the starting time of the adjusted time slot and the time slot length can be combined together to obtain the time slot allocated to the network unit by the local side equipment, and the time slot is issued to the T-CONT of the network unit through BWMAP.
In some exemplary embodiments, the communication network shown in any of the foregoing method embodiments may be a passive optical network, the office device may be an optical line terminal OLT, and the network unit may be an optical network unit ONU.
The existing PON DBA technology cannot meet the fields of industrial control and the like due to large time delay and large jitter. By supporting the zero-latency scheduling method proposed in any of the above embodiments, PON technology can be applied to:
1) In the field of industrial control, the control message is sent periodically, and the PON meets the requirements of the industrial control field, such as low delay, low jitter, uplink and downlink symmetric delay and jitter by supporting the zero-latency scheduling method of any embodiment of the present application.
2) In the periodic signaling scene, a low-delay periodic control signal is arranged between the AC and the AP in the FTTR and POL scenes, and the PON meets the control signaling transmission requirement between the AC and the AP by supporting a zero-waiting scheduling algorithm of any embodiment.
The zero-latency scheduling method is applicable to EPON, GPON, 10G-EPON, XG-PON, XGS-PON and ITU 50G-PON. These PONs can be made to support:
1) Uplink zero waiting: the uplink delay is the same as that of the point-to-point optical fiber direct connection, the data message is zero-waiting at the network unit, and low delay is realized;
2) Upstream zero jitter: the zero-waiting PON DBA algorithm shown in the embodiment of the application can be used for directly dispatching the data message entering the network unit from the UNI port of the network unit, and the PON can not add jitter to the message entering the PON network from the network unit UNI, so that zero-jitter addition is realized.
3) Delay and jitter symmetry: in the prior art of PON, the downstream delay and jitter are small, while the upstream delay and jitter are large, and asymmetric, the zero-latency PON DBA algorithm shown in this embodiment of the present application may implement the same upstream delay and jitter, that is, the symmetry of upstream and downstream delay and jitter.
The zero-latency PON DBA algorithm is the same as the CO-DBA in low-latency and low-jitter performance index, and three using constraint conditions of the CO-DBA are solved while low latency and low jitter are achieved, so that the zero-latency PON algorithm is more universal and easier to commercialize and deploy.
Compared with the existing CO-DBA without using constraint conditions, the zero-waiting scheduling method shown in the embodiment of the application is more universal, commercial and easy to deploy. The method can be applied to the following two fields.
(1) In the field of industrial control, the control message is sent periodically, and the PON meets the requirements of low delay, low jitter, uplink and downlink symmetric delay and jitter in the field of industrial control by supporting the zero-latency scheduling method shown in the embodiment of the present application. In the industrial PON scenario, as shown in fig. 7, the zero-latency scheduling method in the embodiment of the present application may support zero-latency and zero-jitter on an uplink service packet at a network element, so as to satisfy real-time transmission of a periodic industrial control flow. The local side equipment and the industrial PON equipment have no scheduling interface, the deployment position can be at any distance, and the local side equipment and the industrial PON equipment do not need to be restrained at the same physical position.
(2) In a periodic signaling scenario, a low-delay and low-jitter control signal is provided between an FTTR main gateway (i.e., AC) and an FTTR sub-gateway (i.e., AP) in the FTTR scenario, and the PON meets a control signaling transmission requirement between the AC and the AP by supporting a zero-latency scheduling method shown in the embodiment of the present application, that is, the AC may be used as a local side device to execute the zero-latency scheduling method shown in the embodiment of the present application, and the AP may be used as a network element to send an uplink burst through a time slot calculated by the zero-latency scheduling method shown in the embodiment of the present application. As shown in fig. 8.
Referring to fig. 9, a block diagram of a communication network according to an embodiment of the present application is shown. The communication network comprises a local side device 910 and at least one network element 920.
The local side equipment is used for distributing an initial time slot for an uplink burst sent by the T-CONT of the network unit according to the T-CONT parameter of the network unit, and distributing the initial time slot to the T-CONT of the network unit through a BWMAP table, wherein the T-CONT parameter at least comprises a bandwidth parameter; the local side equipment is also used for detecting the number of IDLE frames at the head and tail of the uplink burst; the local side device is further configured to adjust, based on the initial time slot, a time slot allocated to the T-CONT of the network element according to the number of IDLE frames at the head and tail of the uplink burst until the time slot allocated to the T-CONT of the network element has only one IDLE frame at the head and tail of each uplink burst, so as to obtain a time slot allocated to the T-CONT of the network element, where the local side device is further configured to send the time slot to the T-CONT of the network element through BWMAP.
The network unit is configured to receive a time slot sent by the local side device, and send an uplink burst to the local side device according to the time slot.
Optionally, the communication network in any of the foregoing embodiments may be a communication network, the office device may be an optical line terminal OLT, and the network unit may be an optical network unit ONU.
Alternatively, the passive optical network of any of the above embodiments may be any of an EPON network, a GPON network, a 10G-EPON network, an XGPON network, an XGS-PON network, or a 50G-PON, which is not limited by the embodiments of the present application.
Referring to fig. 10, a block diagram of a zero-latency scheduling apparatus according to an embodiment of the present application is shown. The device can be applied to local side equipment of a communication network, and the communication network further comprises a network unit. Specifically, the zero-latency scheduling apparatus may include: an initial slot allocation module 1010, an IDLE detection module 1020, a slot adjustment module 1030, and a slot transmission module 1040.
The initial time slot allocation module 1010 is configured to allocate an initial time slot for an uplink burst sent by the T-CONT of the network unit according to a T-CONT parameter of the network unit, and send the initial time slot to the T-CONT of the network unit through a BWMAP table, where the T-CONT parameter at least includes a bandwidth parameter; an IDLE detection module 1020, configured to detect the number of IDLE frames at the head and tail of the uplink burst; the timeslot adjustment module 1030 is configured to adjust timeslots of the T-CONT allocated to the network element according to the number of IDLE frames at the head and tail of the uplink burst on the basis of the initial timeslots until the timeslots of the T-CONT allocated to the network element make only one IDLE frame at the head and tail of each uplink burst, so as to obtain timeslots of the T-CONT allocated to the network element; a timeslot transmitting module 1040, configured to transmit the timeslot to the T-CONT of the network element through BWMAP.
In some embodiments, the T-CONT parameter in the zero-wait scheduling apparatus may further include a traffic cycle parameter.
In some embodiments, the time slot adjustment module 1030 may include: the first judging module is used for judging whether the number of the IDLE frames of the head is 0, 1 or more than 1; a first execution module, configured to, when the number of IDLE frames of the header is 0, advance a start time of a T-CONT slot allocated to the network element by one IDLE long time on the basis of the initial slot, so that the number of IDLE frames of the header is increased to 1; a second execution module, configured to, when the number of IDLE frames of the header is 1, keep a start time of a T-CONT slot allocated to the network element as a start time of the initial slot unchanged, so that the number of IDLE frames of the header is kept to be 1; and a third execution module, configured to, when the number of IDLE frames of the header is greater than 1, shift the start time of the T-CONT time slot allocated to the network element back by one IDLE long time on the basis of the initial time slot, so that the number of IDLE frames of the header is reduced by 1, and continue to execute the steps of determining whether the number of IDLE frames of the header is 0, 1 or greater than 1 and thereafter until the number of IDLE frames of the header is 1, with the start time of the T-CONT time slot allocated to the network element at this time as the start time of the initial time slot.
In other embodiments, the time slot adjusting module 1030 may include: the second judging module is used for judging whether the number of the IDLE frames at the tail part is 0, 1 or more than 1; a fourth execution module, configured to increase, based on the initial time slot, a time slot length of a T-CONT time slot allocated to the network element by one IDLE long time when the number of IDLE frames of the tail is 0, so that the number of IDLE frames of the tail is increased to 1; a fifth execution module, configured to, when the number of IDLE frames of the tail is 1, keep the slot length of the T-CONT slot allocated to the network element to be the same as the slot length of the initial slot, so that the number of IDLE frames of the tail is kept to be 1; and a sixth execution module, configured to shorten, on the basis of the initial slot, a slot length of the T-CONT slot allocated to the network element by one IDLE length when the number of IDLE frames of the tail is greater than 1, so that the number of IDLE frames of the tail is reduced by 1, and continue to execute steps of determining whether the number of IDLE frames of the tail is 0, 1 or greater than 1 and thereafter until the number of IDLE frames of the tail is 1, with the slot length of the T-CONT slot allocated to the network element at this time being the slot length of the initial slot.
Optionally, the communication network is a passive optical network, the local side device is an optical line terminal OLT, and the network unit is an optical network unit ONU.
Optionally, in some embodiments, the passive optical network is any one of an EPON network, a GPON network, a 10G-EPON network, an XGPON network, an XGS-PON network, and a 50G-PON.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working processes of the modules/units/sub-units/components in the above-described apparatus may refer to corresponding processes in the foregoing method embodiments, which are not described herein again.
In the several embodiments provided herein, the illustrated or discussed coupling or direct coupling or communication connection of the modules to each other may be through some interfaces, indirect coupling or communication connection of devices or modules, electrical, mechanical, or other forms. In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules.
Referring to fig. 11, a block diagram of an electronic device according to an embodiment of the present application is shown. The electronic device in this embodiment may include one or more of the following components: a processor 1110, a memory 1120, and one or more applications, wherein the one or more applications may be stored in the memory 1120 and configured to be executed by the one or more processors 1110, the one or more applications configured to perform the method as described in the foregoing method embodiments.
Wherein the electronic device may be any of a variety of types of computer system devices that are mobile, portable, and perform wireless communications. In particular, the electronic device may be a mobile phone or a smart phone (e.g., an iPhone-based (TM) -based phone), a Portable game device (e.g., a Nintendo DS (TM) -based phone, a PlayStation Portable (TM) -Gameboy Advance TM, an iPhone (TM)), a laptop, a PDA, a Portable internet device, a music player, and a data storage device, other handheld devices, and devices such as a smart watch, a smart bracelet, a headset, a pendant, etc., and the electronic device may also be other wearable devices (e.g., devices such as an electronic glasses, an electronic garment, an electronic bracelet, an electronic necklace, an electronic tattooing, an electronic device, or a head-mounted device (HMD)).
The electronic device may also be any of a number of electronic devices including, but not limited to, cellular telephones, smart phones, smart watches, smart bracelets, other wireless communication devices, personal digital assistants, audio players, other media players, music recorders, video recorders, cameras, other media recorders, radios, medical devices, vehicle transportation equipment, calculators, programmable remote controls, pagers, laptop computers, desktop computers, printers, netbooks, personal Digital Assistants (PDAs), portable Multimedia Players (PMPs), moving picture experts group (MPEG-1 or MPEG-2) audio layer 3 (MP 3) players, portable medical devices, and digital cameras, and combinations thereof.
In some cases, the electronic device may perform a variety of functions (e.g., playing music, displaying video, storing pictures, and receiving and sending phone calls). The electronic device may be, for example, a cellular telephone, a media player, other handheld device, a wristwatch device, a pendant device, an earpiece device, or other compact portable device, if desired.
Optionally, the electronic device may be a server, for example, an independent physical server, a server cluster or a distributed system formed by a plurality of physical servers, or a cloud server that provides cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN (Content Delivery Network ), and basic cloud computing services such as big data and an artificial intelligent platform, or a dedicated or platform server that provides face recognition, autopilot, industrial internet services, data communication (such as 4G, 5G, etc.).
Processor 1110 may include one or more processing cores. The processor 1110 utilizes various interfaces and lines to connect various portions of the overall electronic device, perform various functions of the electronic device, and process data by executing or executing instructions, applications, code sets, or instruction sets stored in the memory 1120, and invoking data stored in the memory 1120. Alternatively, the processor 1110 may be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), programmable logic array (Programmable Logic Array, PLA). The processor 1110 may integrate one or a combination of several of a central processing unit (Central Processing Unit, CPU), an image processor (Graphics Processing Unit, GPU), and a modem, etc. The CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for being responsible for rendering and drawing of display content; the modem is used to handle wireless communications. It will be appreciated that the modem may not be integrated into the processor 1110 and may be implemented solely by a single communication chip.
The Memory 1120 may include a random access Memory (Random Access Memory, RAM) or a Read-Only Memory (Read-Only Memory). Memory 1120 may be used to store instructions, applications, code sets, or instruction sets. The memory 1120 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for implementing at least one function (e.g., a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the various method embodiments described below, etc. The stored data area may also be data created by the electronic device in use (e.g., phonebook, audio-video data, chat-record data), etc.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the processor 1110 and the memory 1120 of the electronic device described above may refer to the corresponding process in the foregoing method embodiment, which is not repeated herein.
Referring to fig. 12, a block diagram of a computer readable storage medium according to an embodiment of the present application is shown. The computer readable storage medium 1200 has stored therein program code that can be invoked by a processor to perform the methods described in the method embodiments described above.
The computer readable storage medium 1200 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, a hard disk, or a ROM. Optionally, the computer readable storage medium 1200 includes a non-volatile computer readable storage medium (non-transitory computer-readable storage medium). The computer readable storage medium 1200 has memory space for program code 1210 that performs any of the method steps described above. The program code can be read from or written to one or more computer program products. Program code 1210 may be compressed, for example, in a suitable form. The computer readable storage medium 1200 may be, for example, a Read-Only Memory (ROM), a random access Memory (Random Access Memory RAM), an SSD, an electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read Only Memory EEPROM), or a Flash Memory (Flash).
In some embodiments, a computer program product or computer program is provided that includes computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the steps in the above-described method embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
From the above description of the embodiments, it will be clear to those skilled in the art that the method of the above embodiments may be implemented by means of software plus a necessary general purpose hardware platform, or of course by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, SSD, flash) and including several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method of the embodiments of the present application.
According to the zero-waiting scheduling method, the zero-waiting scheduling device, the electronic equipment and the storage medium, firstly, local side equipment of a communication network can allocate initial time slots for uplink bursts sent by T-CONT of a network unit according to T-CONT parameters of the network unit, then on the basis of the initial time slots, the time slots allocated to the T-CONT of the network unit are adjusted according to the IDLE frame numbers of the head and the tail of the uplink bursts until the time slots allocated to the T-CONT of the network unit can enable the head and the tail of each uplink burst to have only one IDLE frame, so that the time slots allocated to the T-CONT of the network unit are obtained, and finally the time slots are sent to the T-CONT of the network unit through BWMPs. The T-CONT of the network unit sends an uplink burst through a time slot allocated by the local side equipment, the head of the uplink burst is provided with an IDLE frame, which indicates that a message entering the network unit from a UNI port of the network unit does not reside in the network unit, and the tail of the uplink burst is provided with an IDLE frame, which indicates that the message entering the network unit from the UNI port of the network unit is all sent, namely, all the messages in the uplink burst frame do not reside in the network unit, and zero waiting of the uplink burst is scheduled in the network unit. The messages in the T-CONT of the network unit are scheduled by zero waiting, the uplink time delay is the same as the point-to-point direct connection delay, and the same as the PON downlink delay, so that the PON uplink and downlink time delay symmetry and the minimum delay required by industrial scenes are realized.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (8)

1. A zero-latency scheduling method, applied to a local side device of a communication network, the communication network further comprising a network element, the method comprising:
allocating an initial time slot for an uplink burst sent by the T-CONT of the network unit according to the T-CONT parameter of the network unit, and issuing the initial time slot to the T-CONT of the network unit through a BWMAP table, wherein the T-CONT parameter at least comprises a bandwidth parameter; detecting the number of IDLE frames at the head and tail of the uplink burst;
judging whether the number of the IDLE frames of the head is 0, 1 or more than 1;
when the number of IDLE frames of the header is 0, advancing the start time allocated to the network unit T-CONT slot by one IDLE long time on the basis of the initial slot such that the number of IDLE frames of the header is increased to 1;
When the number of IDLE frames of the header is 1, keeping the start time of the initial time slot allocated to the network unit T-CONT constant so that the number of IDLE frames of the header is kept to be 1;
when the number of the IDLE frames of the head is larger than 1, on the basis of the initial time slot, the starting time of the T-CONT time slot allocated to the network unit is shifted back by one IDLE for a long time, so that the number of the IDLE frames of the head is reduced by 1, the starting time of the T-CONT time slot allocated to the network unit at the moment is taken as the starting time of the initial time slot, and the steps of judging whether the number of the IDLE frames of the head is 0, 1 or larger than 1 and later are continuously executed until the number of the IDLE frames of the head is 1;
judging whether the number of the IDLE frames at the tail part is 0, 1 or more than 1;
when the number of IDLE frames of the tail part is 0, on the basis of the initial time slot, increasing the time slot length of the T-CONT time slot allocated to the network unit by one IDLE for a long time, so that the number of IDLE frames of the tail part is increased to 1;
when the number of IDLE frames of the tail is 1, keeping the time slot length of the time slot allocated to the network unit T-CONT as the time slot length of the initial time slot unchanged, so that the number of IDLE frames of the tail is kept to be 1;
When the number of the IDLE frames of the tail part is larger than 1, shortening the time slot length allocated to the T-CONT time slot of the network unit by one IDLE for a long time on the basis of the initial time slot, so that the number of the IDLE frames of the tail part is reduced by 1, taking the time slot length allocated to the T-CONT time slot of the network unit at the moment as the time slot length of the initial time slot, continuously executing the steps of judging whether the number of the IDLE frames of the tail part is 0, 1 or larger than 1 and then until the number of the IDLE frames of the tail part is 1, and obtaining the time slot of the T-CONT allocated to the network unit;
the time slot is transmitted to the T-CONT of the network element through BWMAP.
2. The method of claim 1, wherein the T-CONT parameters further comprise a traffic cycle parameter.
3. The method according to any of claims 1-2, wherein the communication network is a passive optical network, the office-side equipment is an optical line terminal OLT, and the network unit is an optical network unit ONU.
4. A method according to claim 3, wherein the passive optical network is any one of an EPON network, a GPON network, a 10G-EPON network, an XGPON network, an XGS-PON network, a 50G-PON.
5. A zero-latency communication method, characterized in that it is applied to a communication network, the communication network comprising a local side device and a network element, the method comprising:
the local side equipment allocates an initial time slot for an uplink burst sent by the T-CONT of the network unit according to the T-CONT parameter of the network unit, and sends the initial time slot to the T-CONT of the network unit through a BWMAP table, wherein the T-CONT parameter at least comprises a bandwidth parameter;
the local side equipment detects the number of IDLE frames at the head and tail of the uplink burst;
the local side device judges whether the number of the IDLE frames of the head is 0 or more than 1, when the number of the IDLE frames of the head is 0, on the basis of the initial time slot, the start time of the T-CONT time slot allocated to the network unit is moved forward by one IDLE long time so that the number of the IDLE frames of the head is increased by 1, when the number of the IDLE frames of the head is 1, the start time of the IDLE frames allocated to the T-CONT time slot of the network unit is kept unchanged, the number of the IDLE frames of the head is kept as the start time of the initial time slot, when the number of the IDLE frames of the head is more than 1, on the basis of the initial time slot, the number of the IDLE frames allocated to the network unit is increased by 1, the number of the IDLE frames allocated to the end is further increased by 1, when the number of the IDLE frames of the end is not increased by 1, the IDLE frames allocated to the end is kept as the initial time slot, the end time slot is increased by 1, and when the number of the IDLE frames allocated to the end is not increased by 1, the end time slot is kept as the 1, the end time slot is increased by 1, the end time slot is kept as the length of the initial time slot 1, and when the number of the IDLE frames is increased by 1, the end 1 is kept as the end time slot is increased by 1, and the end time slot is kept as the end time length of the initial time slot 1, on the basis of the initial time slot, shortening the time slot length allocated to the network unit T-CONT time slot by one IDLE long time, so that the number of IDLE frames of the tail is reduced by 1, taking the time slot length allocated to the network unit T-CONT time slot at the moment as the time slot length of the initial time slot, continuously executing the steps of judging whether the number of IDLE frames of the tail is 0, 1 or more than 1 and the later until the number of IDLE frames of the tail is 1, and obtaining the time slot allocated to the T-CONT of the network unit;
The local side equipment sends the time slot to the T-CONT of the network unit through BWMAP; and the network unit receives the time slot sent by the local side equipment and sends an uplink burst to the local side equipment according to the time slot.
6. A zero-latency scheduling apparatus, applied to a local side device of a communication network, the communication network further comprising a network element, the apparatus comprising:
an initial time slot allocation module, configured to allocate an initial time slot for an uplink burst sent by a T-CONT of the network unit according to a T-CONT parameter of the network unit, and send the initial time slot to the T-CONT of the network unit through a BWMAP table, where the T-CONT parameter at least includes a bandwidth parameter; an IDLE detection module, configured to detect the number of IDLE frames at the head and tail of the uplink burst;
a time slot adjusting module, configured to determine whether the number of IDLE frames of the header is 0, 1 or greater than 1, when the number of IDLE frames of the header is greater than 1, on the basis of the initial time slot, move the start time of the IDLE frame allocated to the network unit T-CONT time slot forward by one IDLE long time so that the number of IDLE frames of the header is increased by 1, when the number of IDLE frames of the header is 1, keep the start time allocated to the network unit T-CONT time slot constant, so that the number of IDLE frames of the header is kept 1, when the number of IDLE frames of the header is greater than 1, on the basis of the initial time slot, move the start time of the IDLE frame allocated to the network unit T-CONT time slot backward by one IDLE long time, so that the number of IDLE frames of the header is reduced by 1, continue to perform determination when the number of IDLE frames of the header is 1, keep the number of IDLE frames allocated to the network unit T-CONT time slot is not longer than 1, and when the number of IDLE frames of the header is kept 1, keep the number of IDLE frames of the IDLE frames is not increased by 1, and when the number of IDLE frames of the header is kept 1 is not longer than 1, and when the number of IDLE frames of the IDLE frames is kept 1 is increased by 1, so that the IDLE frames of the network unit is kept 1, on the IDLE time is increased by 1, on the basis of the initial time slot, shortening the time slot length allocated to the network unit T-CONT time slot by one IDLE long time, so that the number of IDLE frames of the tail is reduced by 1, taking the time slot length allocated to the network unit T-CONT time slot at the moment as the time slot length of the initial time slot, continuously executing the steps of judging whether the number of IDLE frames of the tail is 0, 1 or more than 1 and the later until the number of IDLE frames of the tail is 1, and obtaining the time slot allocated to the T-CONT of the network unit;
And the time slot sending module is used for sending the time slot to the T-CONT of the network unit through BWMAP.
7. An electronic device comprising a processor, a memory, the memory storing a computer program, the processor being configured to perform the method of any one of claims 1 to 4 by invoking the computer program.
8. A computer readable storage medium having stored therein at least one instruction, at least one program, code set, or instruction set, the at least one instruction, the at least one program, the code set, or instruction set being loaded and executed by a processor to implement the method of any one of claims 1 to 4.
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