CN114302268A - Multi-service coexistence scheduling method and system based on multi-polling window in EPON system - Google Patents
Multi-service coexistence scheduling method and system based on multi-polling window in EPON system Download PDFInfo
- Publication number
- CN114302268A CN114302268A CN202111560187.7A CN202111560187A CN114302268A CN 114302268 A CN114302268 A CN 114302268A CN 202111560187 A CN202111560187 A CN 202111560187A CN 114302268 A CN114302268 A CN 114302268A
- Authority
- CN
- China
- Prior art keywords
- service
- onu
- scheduling
- transmission
- polling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000005540 biological transmission Effects 0.000 claims abstract description 95
- 238000004364 calculation method Methods 0.000 claims abstract description 32
- 239000000872 buffer Substances 0.000 claims abstract description 27
- 238000013475 authorization Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims description 24
- 230000011664 signaling Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 14
- 230000003287 optical effect Effects 0.000 description 9
- 238000004422 calculation algorithm Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 5
- 230000003044 adaptive effect Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 238000000638 solvent extraction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011176 pooling Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Small-Scale Networks (AREA)
Abstract
The invention discloses a multi-service coexistence scheduling method and a multi-service coexistence scheduling system based on a multi-polling window EPON system, wherein the method comprises the following steps: s1, the OLT grasps the queuing condition in the ONU buffer area, and sends GRANT signal to the ONU for bandwidth authorization; s2, the ONU starts uRLLC service transmission after receiving the GRANT signal; s3, the ONU continues to send a REPORT signal after finishing the uRLLC data packet transmission; s4, after the OLT receives the REPORT signal of the last ONU in the polling scheduling, the OLT sends a GRANT signal of a new scheduling period; s5, the OLT decides the eMBB service scheduling sequence of the ONU according to the eMBB data packet in the ONU buffer area; s6, the eMB service is sent in the round-trip spare time slot of the REPORT uploading of the last ONU and the GRANT issued by the OLT, and the ONU carries out the second round of scheduling aiming at the eMB service according to the scheduling sequence specified in the previous step; s7, when the GRANT signal sent by the OLT reaches the ONU and the eMBB transmission is not finished, the eMBB transmission is terminated, the uRLLC service transmission is executed and the next scheduling period is entered; and S8, performing uplink time delay calculation on the data packet after uplink transmission.
Description
Technical Field
The invention belongs to the technical field of optical and wireless integrated access, and particularly relates to a multi-service coexistence scheduling method and system based on a multi-polling-window EPON system.
Background
With the coming and wide application of the fifth generation mobile communication system (5G), the mobile data traffic and various new services will have blowout-type growth, and the demands of users on data rate, transmission delay, expandability and the like are continuously increased, which provides new challenges for the existing wireless access network. In order to reduce the bandwidth pressure of the forward Network, on the basis of the baseband pooling of a Cloud Radio Access Network (C-RAN), different function partitioning options are used for re-partitioning the forward Network into functions of a baseband processing Unit (BBU) and a Radio Remote Unit (RRU). The Radio access network of 5G evolves from a BBU-RRU two-level structure of 4G/LTE to a three-level structure of a Centralized Unit (CU), a Distributed Unit (DU), and a Radio Unit (RU). However, even if a three-level access network structure with function division is adopted, the requirement of the mobile forwarding network on the bandwidth is still high.
In 5G, there are three main service application scenarios, which are enhanced Mobile BroadBand (eMBB), large Machine Type Communication (mtc), and ultra-Low Latency high reliability Communication (urrllc). The uRLLC service has very high requirement on time delay, the end-to-end communication time delay reaches millisecond level, and the communication reliability reaches more than 99.999%. The eMBB service has higher requirements on the speed of a mobile forwarding network, and has low requirements on time delay and reliability. Therefore, it is one of the important points of current research on how to simultaneously satisfy the characteristic requirements of different communication services in a multi-service coexisting network environment.
Due to the requirement of the mobile forward network for low time delay and large bandwidth, the requirement for the transmission network technology of the mobile forward is also increased. Among many candidates, Ethernet Passive Optical Network (EPON) is considered to be a viable Passive solution due to its low cost and large capacity. The EPON system includes an Optical Link Terminal (OLT) and a plurality of Optical Network Units (ONUs), wherein the OLT is disposed in a central office, and the ONUs are disposed near a subscriber end for receiving and transmitting data from the subscriber end. Due to the structural characteristics of the tree topology of the EPON, uplink transmission data from different ONUs collide in the optical splitter during uplink transmission. Therefore, a good Multi-point Control Protocol (MPCP) is important for an EPON system.
In order to solve the above mentioned problem of collision occurring during the uplink transmission process of the EPON system, the OLT must allocate the uplink transmission Bandwidth to the ONUs in the system through a Dynamic Bandwidth Allocation (DBA) algorithm, which ensures that each ONU can only transmit data within the allocated transmission window. The DBA algorithm relies mainly on two information elements of MPCP, REPORT and GRANT. The ONU REPORTs the current condition and the bandwidth request in the buffer area by uploading REPORT information, the OLT carries out DBA calculation according to the bandwidth request information reported by the ONU, and then sends GRANT signals to the ONUs to allocate bandwidth to each ONU. However, the existing DBA algorithm does not have a good solution for an EPON system with multiple services coexisting, and it is difficult to satisfy the characteristic requirements of different services at the same time. The hybrid dynamic bandwidth allocation algorithm is provided in a laboratory of a folk teacher of Shanghai university of transportation in 2020, and the main idea is that polling is performed by a uRLLC service and an eMBB service in different windows, the uRLLC service REPORTs a REPORT signal through a small competition time slot, but if two ONUs select the same time slot, transmission of the uRLLC service of the two ONUs is cancelled, so that delay of a data packet is increased.
Disclosure of Invention
Aiming at the current situation, the invention provides a technical scheme of multi-service coexistence scheduling in an EPON system based on multiple polling windows to overcome the defects of the prior art, and provides a multi-service coexistence scheduling method and system in the EPON system based on the multiple polling windows.
In order to achieve the purpose, the invention adopts the following technical scheme:
a resource scheduling method for multi-service coexistence based on EPON comprises the following steps:
step 4, according to the principle of offline scheduling, after receiving the REPORT signal of the last ONU in polling scheduling, the OLT sends a GRANT signal of a new scheduling period;
step 5, the OLT determines the dispatching sequence of eMBB services of the ONU according to the number descending sequence of the eMBB data packets in each ONU buffer area;
step 6, the eMB service is sent in a Round-Trip-free Time slot (RTT) of a REPORT uploading of the last ONU and a GRANT signal issued by the OLT, and the ONU carries out a second Round of scheduling aiming at the eMB service according to a scheduling sequence specified in the previous step, namely, step 5 is executed;
step 7, if the GRANT signal sent by the OLT reaches the ONU and the transmission of the eMBB is not finished, the transmission of the eMBB is terminated and the transmission of the urrllc service is executed immediately and the next scheduling cycle is entered, that is, step 2 is executed;
and 8, performing uplink time delay calculation on all the data packets after uplink transmission is finished.
Preferably, the GRANT information sent by the OLT to the ONUs is generated according to a scheduling algorithm in the multi-service coexisting EPON system of the first priority of the resource-isolated uRLLC service proposed in the present invention. As an innovative point of the present invention, according to the disadvantages of the conventional single polling mechanism, the present invention proposes a scheme of performing time slot resource isolation and performing two polling in a single polling cycle. The bandwidth allocation method comprises the start time and the end time of each ONU transmission window polled for the uRLLC service for the first time, the start time and the end time of each ONU transmission window polled for the enhanced-Mobile BroadBand (eMBB) service for the second time, and the length of a polling period after equal-length partitioning. In a first uRLLC polling window, queuing and sending uRLLC service data packets in each ONU buffer area according to a polling sequence, greatly improving the priority of uRLLC service through first polling, and ensuring that the uRLLC service has sufficient bandwidth resources to ensure the reliability of the uRLLC service; in the second polling, the eMBB service data packets in each ONU buffer area are queued and sent according to the polling sequence, and the uRLLC service is sent before the eMBB service, so that the queuing delay of the uRLLC service data packets can be reduced, and the low-delay requirement of the uRLLC service can be effectively ensured.
Preferably, in step 2, immediately after each ONU receives the GRANT signal, the transmission of the urrllc service is started according to a conventional polling sequence, and a guard interval with a length of 2us is provided between two adjacent ONUs for avoiding unnecessary upstream transmission collisions.
Preferably, in step 3, each ONU continues to send a REPORT signal after completing the urrllc packet transmission, so as to REPORT the condition in each ONU buffer and the bandwidth request. Two service types exist in the system, namely uRLLC service and eMBB service. The urrllc service data and the eMBB service data in each ONU arrive in each polling cycle according to poisson distribution. The uRLLC service is sporadic, the data volume is small, but the requirements on time delay and reliability are high, and the time delay of the uRLLC service is required to be controlled within 250us for a mobile forward network; the eMBB has large service volume, low requirements on time delay and reliability, and the time delay is controlled within 4 ms. Therefore, for the eMBB service, the priority is lower than that of the urrllc service. Preferably, in the system, 624.22Bytes are adopted for the uRLLC packet Ethernet frame size and the eMB packet Ethernet frame size, and 64Bytes are adopted for both the REPORT signal Ethernet frame size and the GRANT signal Ethernet frame size.
Preferably, in step 4, different from online scheduling, according to the principle of offline scheduling, the OLT only collects REPORT information of all ONUs in the EPON system in the scheduling period of this time, and then the OLT sends GRANT signals of a new scheduling period to ONUs in the system.
Preferably, in step 5, the OLT determines the scheduling order of the eMBB services of the ONUs in descending order according to the number of the eMBB packets in each ONU buffer in the report information.
Preferably, in step 6, the eMBB service is transmitted in a Round-Trip free Time slot (RTT) of a REPORT upload of the last ONU and a GRANT signal issued by the OLT, and the ONU performs a second Round of scheduling for the eMBB service according to the scheduling order defined in the previous step. Preferably, in the present system, the RTT takes 66.7us, which is the shortest time from the time when a REPORT signal is sent from the ONU to the time when the ONU receives GRANT.
Preferably, in step 7, if the GRANT signal issued by the OLT reaches the ONU and the transmission of the eMBB is not finished, the transmission of the eMBB is terminated and the transmission of the urrllc service is performed immediately and the next scheduling period is entered. The design is to reduce the queuing delay of the uRLLC service in the uplink transmission process, and as long as the OLT finishes collecting REPORT signals of all ONUs and finishes DBA calculation, the GRANT signal can be issued.
Preferably, in step 8, a calculation model is provided for the delay calculation of each data packet in the present invention, as follows:
Latency＝Dqueuing+Dprocessing+Dtransport
in the above delay calculation model, Dqueuing、DprocessingAnd DtransportRespectively representing queuing delay, processing delay and transmission delay. The distance between the ONU and the OLT is preferably set, namely the fronthaul transmission distance is 10km, the generation time delay of an optical signal in an optical fiber is 5us/km, and the transmission time delay is 50 us; the queuing delay refers to the delay from one polling scheduling period to the time before the next week of data packets is sent; the processing delay refers to the time from the beginning of transmitting one bit of a data packet to the end of the last bit.
The invention also discloses a multi-service coexistence scheduling system based on the multi-polling window EPON system, which comprises the following modules:
a bandwidth authorization module: time t0The OLT already grasps the internal queuing condition of each ONU buffer area and sends GRANT signals to the ONUs in the system for bandwidth authorization;
the uRLLC service transmission module: each ONU starts the transmission of uRLLC service immediately after receiving the GRANT signal;
a REPORT signaling module: after finishing the uRLLC data packet transmission, each ONU continuously sends a REPORT signal to REPORT the condition and the bandwidth request in each ONU buffer area;
a GRANT signal sending module: after receiving the REPORT signal of the last ONU in the polling scheduling, the OLT sends a GRANT signal of a new scheduling period;
eMB service scheduling order determining module: the OLT determines the dispatching sequence of eMBB services of the ONU according to the number descending order of the eMBB data packets in each ONU buffer area;
a second round of service scheduling module: sending the eMB service in the round-trip free time slot of the REPORT uploading of the last ONU and the GRANT signal issued by the OLT, and carrying out a second round of scheduling aiming at the eMB service by the ONU according to the scheduling sequence specified in the previous step;
and transmitting and entering the next scheduling period module by the uRLLC service: if the transmission of the eMBB is not finished when the GRANT signal issued by the OLT reaches the ONU, the transmission of the eMBB is terminated and the transmission of the uRLLC service is immediately executed and enters the next scheduling period;
an uplink time delay calculation module: and performing uplink time delay calculation on all the data packets after uplink transmission is finished.
Preferably, the urrllc service transmission module is specifically as follows: each ONU starts the transmission of urrllc traffic according to the conventional polling order immediately after receiving the GRANT signal, with a guard interval of length 2us between two adjacent transmitting ONUs.
Preferably, the module for sending the REPORT signal is specifically as follows: uRLLC service data and eMB service data in each ONU arrive in each polling period according to Poisson distribution; the uRLLC service is sporadic, the data volume is small, but the requirements on time delay and reliability are high, and the time delay is required to be controlled within 250us for a mobile fronthaul network; the eMBB service volume is large, the requirements on time delay and reliability are low, and the time delay is controlled within 4 ms; for the eMBB service, the priority is lower than for the urrllc service.
Preferably, the second round of service scheduling module is specifically as follows: the round-trip free time slot takes 66.7us, the shortest time from when a REPORT signal is sent from an ONU to when the ONU receives GRANT.
Preferably, the uplink delay calculating module specifically includes: a calculation model is provided for the time delay calculation of each data packet, and the calculation model comprises the following steps:
Latency＝Dqueuing+Dprocessing+Dtransport
in the above delay calculation model, Dqueuing、DprocessingAnd DtransportRespectively representing queuing delay, processing delay and transmission delay; the queuing delay refers to the delay from one polling scheduling period to the time before the next round of data packets are sent; the processing delay refers to the time from the beginning of sending one bit of a data packet to the end of the last bit; the transmission delay is a fixed value.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the prior art that the uplink dynamic bandwidth allocation method based on the EPON only aims at the characteristic requirement of a single service in the network, the multi-service coexistence scheduling method based on the multi-polling window PON system provided by the invention can better meet the characteristic requirement of each service in the multi-service coexistence network.
2. The method for scheduling the coexistence of the multiple services in the EPON system based on the polling windows has the advantages that the uRLLC service is polled in the first service, and the priority of the uRLLC service is improved.
3. Since the ONU at the end of the polling queue may not obtain bandwidth resources in the face of high load in the prior art dynamic bandwidth allocation method, it is fatal to guarantee the reliability of the urrllc service in these ONUs. The method for scheduling the coexistence of the multiple services in the EPON system based on the multiple polling windows advances the priority of the uRLLC service, and firstly allocates bandwidth to uRLLC service data in each ONU. Therefore, under the condition of high network load, the broadband is firstly distributed to the uRLLC service, and the reliability of the uRLLC service can be effectively guaranteed.
Drawings
FIG. 1 is a flowchart illustrating a method for scheduling coexistence of multiple services in an EEPON system based on multiple polling windows according to an embodiment;
fig. 2 is a schematic diagram of a 5G mobile fronthaul network structure and an uplink transmission scheme based on a TDM-PON according to an embodiment;
fig. 3 is a schematic diagram of a multi-service coexistence scheduling method in an EPON system based on multiple polling windows according to an embodiment;
fig. 4 is an analysis diagram of an average delay simulation experiment result of urrllc based on a multi-service coexistence scheduling method in a multi-polling-window EPON system according to an embodiment;
fig. 5 is an analysis diagram of an eMBB average delay simulation experiment result of a multi-service coexistence scheduling method in an EPON system with multiple polling windows according to an embodiment;
fig. 6 is a distribution diagram of the cumulative probability of uRLLC packet delay based on the multi-service coexistence scheduling method in the multi-polling window EPON system according to an embodiment;
fig. 7 is a block diagram of a multi-service coexistence scheduling system in the multi-polling window based EPON system according to the second embodiment.
Detailed Description
The following description of the embodiments of the present invention is provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
This embodiment A
As shown in fig. 1, a multi-service coexistence scheduling method in an EPON system based on multiple polling windows includes the steps of:
step 1: suppose that at some starting time t0When the system is in use, the OLT already knows the internal queuing condition of each ONU buffer area and sends GRANT signals to the ONUs in the system for bandwidth authorization;
step 2: each ONU starts the transmission of uRLLC service immediately according to the traditional polling sequence after receiving the GRANT signal, and a guard interval with the length of 2us is arranged between two adjacent transmitted ONUs to avoid unnecessary uplink transmission collision;
and 3, step 3: after finishing the uRLLC data packet transmission, each ONU can continuously send a REPORT signal to REPORT the condition and the bandwidth request in each ONU buffer area;
in this step, each ONU continues to send a REPORT signal after completing the urrllc packet transmission, so as to REPORT the conditions in the buffers of the ONUs and the bandwidth request. Two service types exist in the system, namely uRLLC service and eMBB service. The urrllc service data and the eMBB service data in each ONU arrive in each polling cycle according to poisson distribution. The uRLLC service is sporadic, the data volume is small, but the requirements on time delay and reliability are high, and the time delay of the uRLLC service is required to be controlled within 250us for a mobile forward network; the eMBB has large service volume, low requirements on time delay and reliability, and the time delay is controlled within 4 ms. Therefore, for the eMBB service, the priority is lower than that of the urrllc service. In the system, 624.22Bytes are adopted for the uRLLC packet Ethernet frame size and the eMB packet Ethernet frame size, and 64Bytes are adopted for both the REPORT signal Ethernet frame size and the GRANT signal Ethernet frame size.
And 4, step 4: different from online scheduling, according to the principle of offline scheduling, the OLT only collects REPORT information of all ONUs in the PON system in the scheduling period, and then the OLT sends GRANT signals of a new scheduling period to ONUs in the system;
and 5, step 5: the OLT determines the scheduling sequence of eMB service of the ONU according to the number descending order of eMB data packets in each ONU buffer area in the reported information;
and 6, step 6: in the Round-Trip free Time slot (RTT) where the REPORT of the last ONU uploads and the OLT issues the GRANT signal, the eMBB service is transmitted, and the ONU performs a second Round of scheduling for the eMBB service according to the scheduling order specified in the previous step. In the present system, RTT takes 66.7us, i.e. the shortest time from the time a REPORT signal is sent from ONU to the time the ONU receives GRANT;
and 7, step 7: if the GRANT signal sent by the OLT reaches the ONU and the transmission of the eMBB is not finished, the transmission of the eMBB is terminated and the transmission of the uRLLC service is immediately executed and enters the next scheduling period, the design is to reduce the queuing time delay of the uRLLC service in the uplink transmission process, and the GRANT signal can be sent as long as the OLT finishes the collection of REPORT signals of all the ONU and finishes the DBA calculation;
and 8, step 8: and performing uplink time delay calculation on all the data packets after uplink transmission is finished. The invention provides a calculation model for the time delay calculation of each data packet, which comprises the following steps:
Latency＝Dqueuing+Dprocessing+Dtransport
in the above delay calculation model, Dqueuing、DprocessingAnd DtransportRespectively representing queuing delay, processing delay and transmission delay. The distance between the ONU and the OLT is preferably set, namely the fronthaul transmission distance is 10km, the generation time delay of an optical signal in an optical fiber is 5us/km, and the transmission time delay is 50 us; the queuing delay refers to the delay from one polling scheduling period to the time before the next week of data packets is sent; the processing delay refers to the time from the beginning of transmitting one bit of a data packet to the end of the last bit.
As shown in fig. 2, a schematic diagram of a 5G mobile fronthaul network architecture and an EPON-based upstream transmission scheme is provided. As shown in fig. 2(a), a 5G mobile fronthaul network architecture based on EPON is provided, in which a CU, a DU, and an OLT are physically located together, and an ONU is located at the near end of the RU. The EPON is a point-to-multipoint network, and one OLT is connected with a plurality of ONUs, and the OLT integrally schedules the ONUs. As shown in fig. 2(b), due to the tree topology of the EPON system, during uplink transmission, uplink transmission data from different ONUs may collide in the optical splitter.
As shown in fig. 3, a schematic diagram of a multi-service coexistence scheduling method in an EPON system based on multiple polling windows is provided, and its main idea is: after the ONUs receive the GRANT signal of the OLT, each ONU starts to transmit the uRLLC service according to the traditional polling sequence, and the eMBB service is transmitted after the transmission of the uRLLC service is completed; the transmission of the eMBBs is determined according to the descending order of the number of eMBBs in the buffer of each polling period, and in the process of the eMBBs transmission, if the GRANT signal of a new polling period reaches ONUs, the transmission of the eMBBs is terminated, and the next polling period is started.
As shown in fig. 4, an analysis diagram of the result of the urrllc average delay simulation experiment based on the multi-service coexistence scheduling method in the multi-polling-window EPON system is provided, where the diagram is marked with squares to illustrate the technical solution proposed by the present invention, the lines marked with circles are the same kind of methods for comparison, and the lines marked with triangles are the most classical interleaving polling methods with adaptive periods in the EPON uplink scheduling method. In the figure, the horizontal axis represents the network load, and the vertical axis represents the average time delay of the uRLLC data packet, and it can be seen from the figure that the method and the comparison method provided by the invention can keep the average time delay within 250us, and the interleaved polling method of the adaptive period completely does not guarantee the time delay characteristic requirement. Meanwhile, the change of the network load of the method provided by the invention has little influence on the average time delay of the uRLLC.
As shown in fig. 5, an analysis diagram of eMBB average delay simulation experiment results based on a multi-service coexistence scheduling method in a multi-polling-window EPON system is provided, where the diagram is marked with squares to illustrate the technical solution proposed by the present invention, lines marked with circles are the same kind of methods for comparison, and lines marked with triangles are the most classical interleaving polling methods with adaptive periods in an EPON uplink scheduling method. In the figure, the horizontal axis represents network load, the vertical axis represents average time delay of an eMBB data packet, and the performance of the interleaving polling method of the adaptive period is better because the interleaving polling method only adopts one polling in one scheduling period, so that the required guard interval is reduced, and the bandwidth utilization rate is increased. But the method provided by the invention can still keep the average time delay within 4 ms.
As shown in fig. 6, in the distribution diagram of the cumulative probability of packet delay of the urrllc based on the multi-service coexistence scheduling method in the multi-polling window EPON system, the vertical axis in the diagram is the cumulative probability, the horizontal axis is the distribution of packet delay, and the leftmost line is the distribution curve of the packet delay probability of the method of the present invention, it can be seen that all the packet delays are controlled to 250us, that is, the reliability is 99.999% or more, and the reliability effect of the other two comparison schemes is obviously not as good as that of the scheme of the present invention. This is also an advantage of the present invention.
Compared with the prior art, the invention has the following beneficial effects:
1. different from the traditional uplink dynamic bandwidth allocation method based on the EPON, which only aims at the characteristic requirement of a single service in the network, the multi-service coexistence scheduling method based on the multi-polling-window EPON system provided by the invention can better meet the characteristic requirement of each service in the multi-service coexistence network.
2. Different from other similar methods, the other methods have the processing effect on the uRLLC priority and are not obvious enough for ensuring the uRLLC service requirement.
3. Since the conventional dynamic bandwidth allocation algorithm may not obtain bandwidth resources in the ONU at the end of the polling queue in the face of high load, it is fatal to guarantee the reliability of the urrllc service in these ONUs. The multi-service coexistence scheduling method based on the multi-polling window EPON system advances the priority of the uRLLC service, and firstly allocates bandwidth to the uRLLC service data in each ONU. Therefore, under the condition of high network load, the broadband is firstly distributed to the uRLLC service, and the reliability of the uRLLC service can be effectively guaranteed.
The invention is used for realizing the future 5G and 6G data access Network resource scheduling based on an Optical fiber Network based on a multi-polling window EPON system, and the method is characterized in that the time slot resources transmitted by an Ethernet Passive Optical Network (EPON) are subjected to resource isolation, the time slot resources are divided into an ultra-Reliable Low Latency Communication (ULRLLC) transmission window and an enhanced Mobile broadband (eBB) transmission window in a single polling period, and the polling of all the uRLLC services in the system is firstly completed to improve the priority of the services so as to ensure the requirements of Low time delay and high reliability of the services.
Example two
As shown in fig. 7, the multi-service coexistence scheduling system in the multi-polling window based EPON system includes the following modules:
a bandwidth authorization module: time t0The OLT already grasps the internal queuing condition of each ONU buffer area and sends GRANT signals to the ONUs in the system for bandwidth authorization;
the uRLLC service transmission module: each ONU starts the transmission of uRLLC service immediately according to the traditional polling sequence after receiving the GRANT signal, and a guard interval with the length of 2us is arranged between two adjacent transmitted ONUs;
a REPORT signaling module: after finishing the uRLLC data packet transmission, each ONU continuously sends a REPORT signal to REPORT the condition and the bandwidth request in each ONU buffer area; uRLLC service data and eMB service data in each ONU arrive in each polling period according to Poisson distribution; the uRLLC service is sporadic, the data volume is small, but the requirements on time delay and reliability are high, and the time delay is required to be controlled within 250us for a mobile fronthaul network; the eMBB service volume is large, the requirements on time delay and reliability are low, and the time delay is controlled within 4 ms; for the eMBB service, the priority is lower than that of the uRLLC service;
a GRANT signal sending module: after receiving the REPORT signal of the last ONU in the polling scheduling, the OLT sends a GRANT signal of a new scheduling period;
eMB service scheduling order determining module: the OLT determines the dispatching sequence of eMBB services of the ONU according to the number descending order of the eMBB data packets in each ONU buffer area;
a second round of service scheduling module: sending the eMB service in the round-trip free time slot of the REPORT uploading of the last ONU and the GRANT signal issued by the OLT, and carrying out a second round of scheduling aiming at the eMB service by the ONU according to the scheduling sequence specified in the previous step; the round-trip free time slot takes 66.7us, namely the shortest time from the time when a REPORT signal is sent from the ONU to the time when the ONU receives GRANT;
and transmitting and entering the next scheduling period module by the uRLLC service: if the transmission of the eMBB is not finished when the GRANT signal issued by the OLT reaches the ONU, the transmission of the eMBB is terminated and the transmission of the uRLLC service is immediately executed and enters the next scheduling period;
an uplink time delay calculation module: and performing uplink time delay calculation on all the data packets after uplink transmission, wherein the calculation model is as follows:
Latency＝Dqueuing+Dprocessing+Dtransport
in the above delay calculation model, Dqueuing、DprocessingAnd DtransportRespectively representing queuing delay, processing delay and transmission delay; the queuing delay refers to the delay from one polling scheduling period to the time before the next round of data packets are sent; the processing delay refers to the time from the beginning of sending one bit of a data packet to the end of the last bit; the transmission delay is a fixed value.
The invention is based on the multi-polling window, and integrates the DBA algorithm of the first priority of the uRLLC service, and further improves the priority of the uRLLC service on the basis of the prior similar technical scheme. Simulation experiment results show that the technical scheme provided by the invention is superior to the prior similar technical scheme, and meanwhile, the performance of the network is more outstanding under the network condition of higher uRLLC ratio.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The multi-service coexistence scheduling method based on the multi-polling window EPON system is characterized by comprising the following steps:
s1, at start time t0The OLT already grasps the internal queuing condition of each ONU buffer area and sends GRANT signals to the ONUs in the system for bandwidth authorization;
s2, each ONU starts the transmission of uRLLC service immediately after receiving the GRANT signal;
s3, each ONU continues to send a REPORT signal after finishing uRLLC data packet transmission, for reporting the condition and bandwidth request in each ONU buffer area;
s4, when the OLT receives the REPORT signal of the last ONU in the polling scheduling, the OLT sends a GRANT signal of a new scheduling period;
s5, the OLT determines the dispatching sequence of the eMBB service of the ONU according to the number descending order of the eMBB data packets in each ONU buffer area;
s6, transmitting eMB service in the round-trip free time slot of the REPORT uploading of the last ONU and the GRANT signal issued by the OLT, the ONU performing the second round of scheduling aiming at the eMB service according to the scheduling sequence specified in the previous step, and executing the step S5;
s7, if the GRANT signal sent by the OLT reaches the ONU and the transmission of the eMBB is not finished, the transmission of the eMBB is terminated and the transmission of the uRLLC service is executed immediately and enters the next scheduling period, and the step 2 is executed;
and S8, performing uplink time delay calculation on all the data packets after uplink transmission.
2. The multi-service coexistence scheduling method in a multi-polling-window based EPON system according to claim 1, wherein in S2, immediately after each ONU receives the GRANT signal, the transmission of the urrllc service is started according to a conventional polling order, and there is a guard interval with a length of 2us between two adjacent transmitting ONUs.
3. The multi-service coexistence scheduling method in the multi-polling-window based EPON system according to claim 1, wherein in S3, the uRLLC service data and the eMBB service data in each ONU arrive in each polling cycle according to poisson distribution; the uRLLC service is sporadic, the data volume is small, but the requirements on time delay and reliability are high, and the time delay is required to be controlled within 250us for a mobile fronthaul network; the eMBB service volume is large, the requirements on time delay and reliability are low, and the time delay is controlled within 4 ms; for the eMBB service, the priority is lower than for the urrllc service.
4. The multi-service coexistence scheduling method according to claim 1 in the multi-polling window based EPON system, wherein the round-trip free time slot is 66.7us, which is the shortest time from when a REPORT signal is transmitted from the ONU to when the ONU receives the GRANT, in S6.
5. The multi-service coexistence scheduling method in the multi-polling-window-based EPON system according to any one of claims 1 to 4, wherein S8 proposes a calculation model for the delay calculation of each packet, as follows:
Latency＝Dqueuing+Dprocessing+Dtransport
in the time delay calculation model, Dqueuing, Dprocessing and Dtransport respectively represent queuing time delay, processing time delay and transmission time delay; the queuing delay refers to the delay from one polling scheduling period to the time before the next round of data packets are sent; the processing delay refers to the time from the beginning of sending one bit of a data packet to the end of the last bit; the transmission delay is a fixed value.
6. The multi-service coexistence scheduling system based on the multi-polling window EPON system is characterized by comprising the following modules:
a bandwidth authorization module: at time t0, the OLT already knows the internal queuing conditions of the ONU buffers, and sends GRANT signals to the ONUs in the system to perform bandwidth authorization;
the uRLLC service transmission module: each ONU starts the transmission of uRLLC service immediately after receiving the GRANT signal;
a REPORT signaling module: after finishing the uRLLC data packet transmission, each ONU continuously sends a REPORT signal to REPORT the condition and the bandwidth request in each ONU buffer area;
a GRANT signal sending module: after receiving the REPORT signal of the last ONU in the polling scheduling, the OLT sends a GRANT signal of a new scheduling period;
eMB service scheduling order determining module: the OLT determines the dispatching sequence of eMBB services of the ONU according to the number descending order of the eMBB data packets in each ONU buffer area;
a second round of service scheduling module: sending the eMB service in the round-trip free time slot of the REPORT uploading of the last ONU and the GRANT signal issued by the OLT, and carrying out a second round of scheduling aiming at the eMB service by the ONU according to the scheduling sequence specified in the previous step;
and transmitting and entering the next scheduling period module by the uRLLC service: if the transmission of the eMBB is not finished when the GRANT signal issued by the OLT reaches the ONU, the transmission of the eMBB is terminated and the transmission of the uRLLC service is immediately executed and enters the next scheduling period;
an uplink time delay calculation module: and performing uplink time delay calculation on all the data packets after uplink transmission is finished.
7. The multi-service coexistence scheduling system according to claim 6 in the multi-polling-window-based EPON system, wherein the uRLLC service transmission module is specifically as follows: each ONU starts the transmission of urrllc traffic according to the conventional polling order immediately after receiving the GRANT signal, with a guard interval of length 2us between two adjacent transmitting ONUs.
8. The multi-service coexistence scheduling system according to claim 6, wherein the REPORT signal sending module is specifically as follows: uRLLC service data and eMB service data in each ONU arrive in each polling period according to Poisson distribution; the uRLLC service is sporadic, the data volume is small, but the requirements on time delay and reliability are high, and the time delay is required to be controlled within 250us for a mobile fronthaul network; the eMBB service volume is large, the requirements on time delay and reliability are low, and the time delay is controlled within 4 ms; for the eMBB service, the priority is lower than for the urrllc service.
9. The multi-service coexistence scheduling system according to claim 6 in the multi-polling-window-based EPON system, wherein the second round of service scheduling module specifically comprises: the round-trip free time slot takes 66.7us, the shortest time from when a REPORT signal is sent from an ONU to when the ONU receives GRANT.
10. The multi-service coexistence scheduling system according to any one of claims 6 to 9 in the multi-polling-window-based EPON system, wherein the uplink delay calculating module is specifically as follows: a calculation model is provided for the time delay calculation of each data packet, and the calculation model comprises the following steps:
Latency＝Dqueuing+Dprocessing+Dtransport
in the time delay calculation model, Dqueuing, Dprocessing and Dtransport respectively represent queuing time delay, processing time delay and transmission time delay; the queuing delay refers to the delay from one polling scheduling period to the time before the next round of data packets are sent; the processing delay refers to the time from the beginning of sending one bit of a data packet to the end of the last bit; the transmission delay is a fixed value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111560187.7A CN114302268B (en) | 2021-12-20 | 2021-12-20 | Multi-service coexistence scheduling method and system in EPON system based on multi-polling window |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111560187.7A CN114302268B (en) | 2021-12-20 | 2021-12-20 | Multi-service coexistence scheduling method and system in EPON system based on multi-polling window |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114302268A true CN114302268A (en) | 2022-04-08 |
| CN114302268B CN114302268B (en) | 2024-02-23 |
Family
ID=80968355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111560187.7A Active CN114302268B (en) | 2021-12-20 | 2021-12-20 | Multi-service coexistence scheduling method and system in EPON system based on multi-polling window |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114302268B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115175024A (en) * | 2022-06-01 | 2022-10-11 | 苏州大学 | Passive optical network bandwidth resource scheduling method and system for mobile transmission |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103905336A (en) * | 2014-04-24 | 2014-07-02 | 河北工程大学 | Method for scheduling QoS sensing in SIEPON based on network coding technology |
| CN109348315A (en) * | 2018-10-15 | 2019-02-15 | 中天宽带技术有限公司 | Based on the time-multiplexed distribution method of dynamic bandwidth for adjusting bandwidth allocation parameters |
| CN110784295A (en) * | 2019-10-25 | 2020-02-11 | 中山大学 | Uplink URRLC service and eMBB service coexistence method based on preemption |
| CN112087782A (en) * | 2020-09-11 | 2020-12-15 | 杭州电子科技大学 | Bandwidth allocation method for coexistence of EMBB and URLLC in X-Haul network |
| CN112312564A (en) * | 2020-10-23 | 2021-02-02 | 惠州Tcl移动通信有限公司 | Communication service scheduling method and device and storage medium |
| CN113207048A (en) * | 2021-03-15 | 2021-08-03 | 广东工业大学 | Uplink bandwidth allocation method based on neural network prediction in 50G-PON (Passive optical network) |
-
2021
- 2021-12-20 CN CN202111560187.7A patent/CN114302268B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103905336A (en) * | 2014-04-24 | 2014-07-02 | 河北工程大学 | Method for scheduling QoS sensing in SIEPON based on network coding technology |
| CN109348315A (en) * | 2018-10-15 | 2019-02-15 | 中天宽带技术有限公司 | Based on the time-multiplexed distribution method of dynamic bandwidth for adjusting bandwidth allocation parameters |
| CN110784295A (en) * | 2019-10-25 | 2020-02-11 | 中山大学 | Uplink URRLC service and eMBB service coexistence method based on preemption |
| CN112087782A (en) * | 2020-09-11 | 2020-12-15 | 杭州电子科技大学 | Bandwidth allocation method for coexistence of EMBB and URLLC in X-Haul network |
| CN112312564A (en) * | 2020-10-23 | 2021-02-02 | 惠州Tcl移动通信有限公司 | Communication service scheduling method and device and storage medium |
| CN113207048A (en) * | 2021-03-15 | 2021-08-03 | 广东工业大学 | Uplink bandwidth allocation method based on neural network prediction in 50G-PON (Passive optical network) |
Non-Patent Citations (1)
| Title |
|---|
| ZHIWEI XU 等: "An Upstream Latency Optimization Scheme for TDM-PON Fronthaul Network based on Double Polling Mechanism", 《ASIA COMMUNICATIONS AND PHOTONICS CONFERENCE 2021》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115175024A (en) * | 2022-06-01 | 2022-10-11 | 苏州大学 | Passive optical network bandwidth resource scheduling method and system for mobile transmission |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114302268B (en) | 2024-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106658735B (en) | Long propagation time delay wireless link time slot allocation method based on TDMA | |
| CN110224755B (en) | Low-delay device and method for 5G forward transmission | |
| CN108494649B (en) | Bus system based on combination of polling and uniform time slot and data transmission method | |
| Nakayama et al. | Wavelength and bandwidth allocation for mobile fronthaul in TWDM-PON | |
| CN107222404B (en) | Parallel path forwarding method with redundant coding in WOBAN | |
| CN105188150A (en) | Method and system for lowering long term evolution (LTE) uplink data transmission delay | |
| CN114039934B (en) | Scheduling method of multi-service coexistence TDM-PON system based on double polling mechanism | |
| CN113207048B (en) | Neural network prediction-based uplink bandwidth allocation method in 50G-PON (Passive optical network) | |
| CN111556528A (en) | Channel state judgment method based on frequency hopping time hopping pattern under self-organizing network | |
| CN108200652B (en) | Communication method and device applied to unmanned aerial vehicle cluster | |
| CN114302268B (en) | Multi-service coexistence scheduling method and system in EPON system based on multi-polling window | |
| Wang et al. | On the performance of Hybrid-PON scheduling strategies for NG-EPON | |
| CN102904836A (en) | Real-time service time slot encapsulating method for multi-frequency time-division multiple-address access system | |
| CN116634313B (en) | Single-frame multi-burst distribution method, burst frame uplink method, distribution device and computer readable storage medium in optical forwarding network | |
| CN114339491B (en) | TWDM-PON system multi-service coexistence scheduling method and system based on 5G network slice | |
| WO2020221430A1 (en) | Method and apparatus for controlling transmission of an upstream packet traffic in a tdm pon-based fronthaul | |
| CN108141403A (en) | Relay transmission system, relay transmission method and relay transmission device | |
| CN117098192B (en) | Urban rail ad hoc network resource allocation method based on capacity and time delay optimization | |
| Clarke et al. | Simultaneous and interleaved polling: an upstream protocol for WDM-PON | |
| CN101471851B (en) | Registration method of slave equipment to main equipment of packet-switching network | |
| CN115175024B (en) | Method and system for scheduling bandwidth resources of passive optical network for mobile transmission | |
| CN112261667B (en) | FIWI network media access control system and method based on edge calculation | |
| Das et al. | Schedulers synchronization supporting ultra reliable low latency communications (URLLC) in cloud-RAN over virtualised mesh PON | |
| CN114979841A (en) | Method, device and system for improving uplink bandwidth utilization rate in passive optical network | |
| Huo et al. | Cluster and probability competition based MAC scheme in power line communications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |