CN114302268B - Multi-service coexistence scheduling method and system in EPON system based on multi-polling window - Google Patents
Multi-service coexistence scheduling method and system in EPON system based on multi-polling window Download PDFInfo
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Abstract
The invention discloses a multi-service coexistence scheduling method and a system in an EPON system based on a multi-polling window, wherein the method comprises the following steps: s1, an OLT grasps queuing conditions in an ONU buffer area and sends GRANT signals to the ONU for bandwidth authorization; s2, after receiving GRANT signals, ONU starts uRLLC service transmission; s3, the ONU continues to send the REPORT signal after completing uRLLC data packet transmission; s4, after the OLT receives the REPORT signal of the last ONU in the polling scheduling, the OLT transmits a GRANT signal of a new scheduling period; s5, the OLT determines an eMBB service scheduling sequence of the ONU according to the eMBB data packet in the ONU buffer area; s6, the last ONU transmits the eMBB service in the REPORT uploading of the last ONU and the round trip free time slot of the GRANT issued by the OLT, and the ONU performs the second round of scheduling for the eMBB service according to the scheduling sequence specified in the previous step; s7, when the GRANT signal issued by the OLT reaches the ONU, the eMBB transmission is terminated if the eMBB transmission is not finished, uRLLC service transmission is executed, and the next scheduling period is entered; s8, carrying out 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 fusion access, and particularly relates to a multi-service coexistence scheduling method and system based on a multi-polling window EPON system.
Background
With the advent of the fifth generation mobile communication system (5G) and wide application, the mobile data flow and various new services will have blowout type growth, and the demands of users on data rate, transmission delay, expandability and other aspects continue to increase, which presents new challenges to the existing wireless access network. In order to relieve bandwidth pressure of the forwarding network, on the basis of baseband pooling of the cloud radio access network (Cloud Radio Access Network, C-RAN), different function segmentation options re-divide functions of a baseband processing Unit (BBU) and a remote radio Unit (Radio Remote Unit, RRU) of the forwarding network. The 5G Radio access network evolves from a BBU-RRU two-level structure of 4G/LTE to a three-level structure of Centralized Units (CUs), distributed Units (DUs), radio Units (RU). However, even with a three-level access network architecture with function segmentation, the bandwidth requirements of the mobile forwarding network are still high.
There are three main service application scenarios in 5G, namely enhanced Mobile BroadBand (eMBB), large-scale machine type communication (massive Machine Type Communication, emtc), and ultra low latency high reliability communication (ultra-Reliable and Low Latency Communication, ul lc). The uRLLC service has very high time delay requirement, 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 the mobile forwarding network, and has low requirements on time delay and reliability. Therefore, how to simultaneously satisfy the characteristic requirements of different communication services in a network environment where multiple services coexist in a mobile forwarding network is one of the key points of current research.
Due to the low-delay and large-bandwidth requirements of the mobile forwarding network, the requirements on the technology of the mobile forwarding transmission network are also improved. Among the many alternatives, ethernet passive optical networks (Ethernet Passive Optical Network, EPON) are considered to be a viable passive solution due to their low cost, high capacity. The EPON system is composed of an optical link terminal (Optical Terminal Link, OLT) and a plurality of optical network units (Optical Network Unit, ONU), the OLT is arranged in a central office, and the ONU is arranged near a user end for receiving and transmitting data of the user end. Because of the tree topology of EPONs, in the uplink transmission process, uplink transmission data from different ONUs may collide in the optical splitter. Therefore, a good multipoint control protocol (Multi-point Control Protocol, MPCP) is particularly important for EPON systems.
In order to solve the above-mentioned collision problem that may occur during the uplink transmission process of the EPON system, the OLT must allocate the uplink transmission bandwidth to the ONUs in the system by using a dynamic bandwidth allocation (Dynamic Bandwidth Allocation, DBA) algorithm, so as to ensure that each ONU can only perform data transmission within the allocated transmission window. The DBA algorithm relies mainly on two information units, REPORT and GRANT, of MPCP. The ONU REPORTs the condition and the bandwidth request in the current buffer area by uploading REPORT information, the OLT carries out DBA calculation according to the bandwidth request information reported by the ONU, and then a GRANT signal is sent to the ONUs to allocate the bandwidth to each ONU. However, the existing DBA algorithm does not have a better solution for an EPON system with multiple services coexisting, and it is difficult to well meet the characteristic requirements of different services at the same time. The hybrid dynamic bandwidth allocation algorithm is proposed by a teacher laboratory of Shanghai university She Tong in 2020, and the main idea is that the uRLLC service and the eMBB service are polled in windows, and the uRLLC service REPORTs the REPORT signal through competing small time slots, but if two ONUs select the same time slot, the uRLLC service transmission of the two ONUs is cancelled, thereby increasing the delay of the data packet.
Disclosure of Invention
Aiming at the current situation, the invention provides a multi-service coexistence scheduling technical scheme based on a multi-polling window EPON system to overcome the defects of the prior art, and provides a multi-service coexistence scheduling method and system based on the multi-polling window EPON system.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a multi-service coexistence resource scheduling method based on EPON comprises the following steps:
step 1, assume that at a certain start time t 0 When the OLT has mastered the internal queuing condition of each ONU buffer zone, and sends GRANT signals to the ONU in the system for bandwidth authorization;
step 2, each ONU immediately starts the transmission of uRLLC business after receiving GRANT signal; preferably, this step may start transmission of the ul lc traffic according to a conventional polling order.
Step 3, each ONU continuously transmits a REPORT signal after completing uRLLC data packet transmission so as to REPORT the condition and bandwidth request in each ONU buffer;
step 4, according to the principle of off-line scheduling, after the OLT receives the REPORT signal of the last ONU in the polling scheduling, the OLT transmits a GRANT signal of a new round of scheduling period;
step 5, the OLT determines the scheduling sequence of the eMBB service of the ONU according to the descending order of the number of eMBB data packets in each ONU buffer area;
step 6, in the REPORT uploading of the last ONU and the Round-Trip Time (RTT) of the GRANT signal issued by the OLT, the ONU performs the second Round of scheduling on the eMBB service according to the scheduling sequence specified in the previous step, namely, the step 5 is executed;
step 7, if the GRANT signal sent by the OLT reaches the ONU, the transmission of the eMBB is not finished yet, and then the transmission of the eMBB is terminated to immediately perform the transmission of the ul lc service and enter the next scheduling period, i.e. step 2 is performed;
and 8, performing uplink time delay calculation on all the data packets after uplink transmission.
Preferably, the GRANT information sent by the OLT to the ONU is generated according to the scheduling algorithm in the multi-service coexistence EPON system of the first priority of the resource-isolated ul lc service proposed in the present invention. As an innovation point of the present invention, according to the shortcomings of the conventional single polling mechanism, the present invention proposes a scheme of performing slot resource isolation and performing polling twice in a single polling period. The content of the bandwidth allocation method comprises the beginning time and the ending time of each ONU transmission window of the first time of the uRLLC service polling, the beginning time and the ending time of each ONU transmission window of the second time of the enhanced-Mobile BroadBand (eMBB) service polling, and the polling period length after being divided according to the equal length. In a first uRLLC polling window, queuing and transmitting uRLLC service data packets in each ONU buffer area according to a polling sequence, and greatly improving the priority of the uRLLC service through first polling to ensure that the uRLLC service data packets have sufficient bandwidth resources to ensure the reliability of the uRLLC service data packets; 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 is reduced, and the low delay requirement of the uRLLC service can be effectively ensured.
Preferably, in step 2, each ONU immediately starts transmission of the ul lc service according to the conventional polling sequence after receiving the GRANT signal, and there is a guard interval with a length of 2us between two adjacent transmitting ONUs, so as to avoid unnecessary uplink transmission collision.
Preferably, in step 3, each ONU will continue to send a REPORT signal after completing the ul lc packet transmission, so as to REPORT the situation and bandwidth request in each ONU buffer. There are two types of traffic in the system, namely the uRLLC traffic and the eMBB traffic. The uRLLC service data and the eMBB service data in each ONU arrive in each polling period according to the Poisson distribution. The uRLLC service is sporadic, the data volume is small, but the time delay and reliability requirements are high, and the time delay required by the uRLLC service on a mobile forwarding network is controlled within 250 us; the eMBB has large traffic, low requirements on time delay and reliability, and the time delay is controlled within 4 ms. Therefore, for the eMBB traffic, its priority is lower than for the ul lc traffic. In the system, 624.22Bytes are used for the uRLLC data packet Ethernet frame size and the eMBB data packet Ethernet frame size, and 64Bytes are used for the REPORT signal Ethernet frame size and the GRANT signal Ethernet frame size.
Preferably, in step 4, unlike online scheduling, according to the offline scheduling principle, the OLT only collects REPORT information of all ONUs in the EPON system in the current scheduling period, and then the OLT sends a GRANT signal of a new scheduling period to ONUs in the system.
Preferably, in step 5, the OLT determines the scheduling order of the eMBB service of the ONUs according to the descending order of the number of the eMBB packets in each ONU buffer in the report information.
Preferably, in step 6, in a Round-Trip Time slot (RTT) of the GRANT signal sent by the last ONU and the last ONU, the ONU will send an eMBB service, and schedule the eMBB service for the second Round according to the scheduling sequence specified in the previous step. Preferably, in the present system, RTT is 66.7us, i.e. the shortest time for a REPORT signal to be sent from ONU to receive GRANT.
Preferably, in step 7, if the GRANT signal sent by the OLT reaches the ONU, the transmission of the eMBB is not completed yet, and then the transmission of the eMBB is terminated to immediately perform the transmission of the ul lc service and enter the next scheduling period. The design is to reduce queuing delay of uRLLC service in the uplink transmission process, and the OLT can issue GRANT signal as long as the OLT completes collection of REPORT signals of all ONUs and DBA calculation.
Preferably, in step 8, a calculation model is provided for calculating the time delay of each data packet in the present invention, as follows:
Latency＝D queuing +D processing +D transport
in the time delay calculation model, D queuing 、D processing And D transport Representing queuing delay, processing delay and transmission delay, respectively. The invention preferably sets the distance between ONU and OLT, namely the forward transmission distance is 10km, the time delay of the optical signal generated in the optical fiber is 5us/km, and the transmission time delay is 50us; queuing delay refers to the delay from one polling scheduling period to the time before the next week is sent; processing delay refers to the beginning of a bit to the end of the last bit of a packet to be sent.
The invention also discloses a multi-service coexistence scheduling system based on the multi-polling window EPON system, which comprises the following modules:
and a bandwidth authorization module: time t 0 The OLT has mastered the internal queuing condition of each ONU buffer zone and sends GRANT signals to the ONU in the system for bandwidth authorization;
uRLLC service transmission module: each ONU immediately starts the transmission of uRLLC service after receiving GRANT signal;
a REPORT signal sending module: each ONU continuously transmits a REPORT signal after completing uRLLC data packet transmission so as to REPORT the condition and bandwidth request in each ONU buffer area;
and a GRANT signal sending module: when the OLT receives the REPORT signal of the last ONU in the polling schedule, the OLT transmits a GRANT signal of a new scheduling period;
an eMBB service scheduling sequence deciding module: the OLT determines the scheduling sequence of the eMBB service of the ONU according to the descending order of the number of eMBB data packets in each ONU buffer area;
and a second round of service scheduling module: in the REPORT uploading of the last ONU and the round trip vacant time slot of the GRANT signal issued by the OLT, the ONU transmits the eMBB service, and the ONU performs the second round of scheduling for the eMBB service according to the scheduling sequence specified in the previous step;
uRLLC service transmission and entering the next scheduling period module: if the GRANT signal issued by the OLT reaches the ONU, the transmission of the eMBB is not finished yet, the transmission of the eMBB is terminated, the transmission of the uRLLC service is immediately executed, and the next scheduling period is entered;
and an uplink time delay calculation module: and carrying out uplink time delay calculation on all the data packets after uplink transmission.
Preferably, the uRLLC service transmission module is specifically as follows: each ONU immediately starts transmission of the ul lc service according to the conventional polling order after receiving the GRANT signal, and a guard interval with a length of 2us is provided between two adjacent ONUs.
Preferably, the REPORT signal sending module specifically includes: uRLLC service data and eMBB 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 time delay and reliability requirements are high, and the time delay of the mobile forwarding network is required to be controlled within 250 us; the eMBB has large traffic and low requirements on time delay and reliability, and the time delay is controlled within 4 ms; for the eMBB traffic, the priority is lower than for the ul lc traffic.
Preferably, the second round service scheduling module specifically includes: the round trip free time slot takes 66.7us, the minimum time that a REPORT signal is sent from ONU to receive GRANT.
Preferably, the uplink time delay calculation module specifically includes: a calculation model is provided for the time delay calculation of each data packet, and the calculation model is as follows:
Latency＝D queuing +D processing +D transport
at the time delayIn the calculation model, D queuing 、D processing And D transport Respectively 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 cycle is transmitted; processing delay refers to transmitting a bit of a data packet from the beginning 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. unlike the conventional EPON-based uplink dynamic bandwidth allocation method, the multi-service coexistence scheduling method in the multi-polling window-based PON system provided by the invention can better meet the characteristic requirements of all services in the multi-service coexistence network.
2. The method adopted in the prior art has an insufficient treatment effect on uRLLC priority and has insufficient guarantee on the uRLLC service requirement, and the multi-service coexistence scheduling method in the EPON system based on the multi-polling window provided by the invention polls the uRLLC service in the first service first time, thereby improving the priority of the uRLLC service.
3. Since the prior art dynamic bandwidth allocation method is faced with high load, the ONUs at the end of the poll queue may not be able to obtain bandwidth resources, which is fatal to the reliability guarantee of the ul lc traffic in these ONUs. The multi-service coexistence scheduling method d in the EPON system based on the multi-polling window advances the service priority of the uRLLC, and firstly allocates bandwidth to the service data of the uRLLC in each ONU. Therefore, under the condition of high load of the network, broadband is distributed to the uRLLC service, and the reliability of the uRLLC service can be effectively ensured.
Drawings
Fig. 1 is a flowchart of an embodiment of a multi-service coexistence scheduling method in an EEPON system based on a multi-polling window;
fig. 2 is a schematic diagram of a 5G mobile forwarding network structure and an uplink transmission scheme based on TDM-PON according to the first 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 a chart of analysis of results of a uirllc average time delay simulation experiment based on a multi-service coexistence scheduling method in a multi-polling window EPON system;
fig. 5 is an analysis chart of an eMBB average time delay simulation experiment result of a multi-service coexistence scheduling method in an EPON system based on a multi-polling window according to an embodiment;
fig. 6 is a chart of a cumulative probability distribution of delays of ul lc packets based on a multi-service coexistence scheduling method in a multi-polling window EPON system;
fig. 7 is a block diagram of a multi-service coexistence scheduling system in a multi-poll window EPON-based system according to embodiment two.
Detailed Description
The following specific examples are presented to illustrate the present invention, and those skilled in the art will readily appreciate the additional advantages and capabilities of the present invention as disclosed herein. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments 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 more clearly illustrating the technical solutions of the present invention and are not intended to limit the scope of protection of the present application.
First embodiment
The method for scheduling multi-service coexistence in the EPON system based on the multi-polling window, as shown in fig. 1, comprises the following steps:
step 1: it is assumed that at a certain start time t 0 When the OLT knows the internal queuing condition of each ONU buffer zone, and sends GRANT signals to the ONU in the system for bandwidth authorization;
step 2: each ONU immediately starts the transmission of uRLLC service 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 so as to avoid unnecessary uplink transmission conflict;
step 3: each ONU continuously transmits a REPORT signal after completing uRLLC data packet transmission so as to REPORT the conditions and bandwidth requests in each ONU buffer;
in this step, each ONU will continue to send a REPORT signal after completing the transmission of the ul lc packet, so as to REPORT the situation and bandwidth request in each ONU buffer. There are two types of traffic in the system, namely the uRLLC traffic and the eMBB traffic. The uRLLC service data and the eMBB service data in each ONU arrive in each polling period according to the Poisson distribution. The uRLLC service is sporadic, the data volume is small, but the time delay and reliability requirements are high, and the time delay required by the uRLLC service on a mobile forwarding network is controlled within 250 us; the eMBB has large traffic, low requirements on time delay and reliability, and the time delay is controlled within 4 ms. Therefore, for the eMBB traffic, its priority is lower than for the ul lc traffic. In the system, 624.22Bytes are used for uRLLC data packet Ethernet frame size and eMBB data packet Ethernet frame size, and 64Bytes are used for REPORT signal Ethernet frame size and GRANT signal Ethernet frame size.
Step 4: different from online scheduling, according to the offline scheduling principle, the OLT only collects REPORT information of all ONUs in the PON system in the current scheduling period, and then the OLT can send GRANT signals of a new round of scheduling period to ONUs in the system;
step 5: the OLT determines the scheduling sequence of the eMBB service of the ONU according to the descending order of the number of eMBB data packets in each ONU buffer area in the reported information;
step 6: in the REPORT upload of the last ONU and the Round-Trip Time (RTT) of the GRANT signal issued by the OLT, the ONU will send the eMBB service, and schedule the second Round of the eMBB service according to the schedule sequence specified in the previous step. In the system, RTT is 66.7us, i.e. the shortest time for a REPORT signal to be sent from ONU to receive GRANT;
step 7: if the GRANT signal sent by the OLT reaches the ONU, the transmission of the eMBB is not finished, then the transmission of the eMBB is stopped to immediately execute the transmission of the uRLLC service and enter the next scheduling period, the design is to reduce the queuing delay of the uRLLC service in the uplink transmission process, and the GRANT signal can be sent as long as the OLT completes the collection of the REPORT signals of all the ONUs and the DBA calculation;
step 8: and carrying out uplink time delay calculation on all the data packets after uplink transmission. The invention provides a calculation model for the time delay calculation of each data packet, and the calculation model is as follows:
Latency＝D queuing +D processing +D transport
in the time delay calculation model, D queuing 、D processing And D transport Representing queuing delay, processing delay and transmission delay, respectively. The invention preferably sets the distance between ONU and OLT, namely the forward transmission distance is 10km, the time delay of the optical signal generated in the optical fiber is 5us/km, and the transmission time delay is 50us; queuing delay refers to the delay from one polling scheduling period to the time before the next week is sent; processing delay refers to the beginning of a bit to the end of the last bit of a packet to be sent.
As shown in fig. 2, a 5G mobile forwarding network structure and an EPON-based uplink transmission scheme schematic diagram are provided. As shown in fig. 2 (a), there is provided an EPON-based 5G mobile forwarding network structure, CU, DU and OLT are physically placed together, while ONU is placed at the near-end of RU. EPON is a point-to-multipoint network, where an OLT is connected to multiple ONUs, and the OLT performs overall scheduling for the ONUs. As shown in fig. 2 (b), due to the tree topology of the EPON system, in the uplink transmission process, 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 a multi-polling window EPON system is provided, and the main idea is that: after ONUs receive GRANT signals of the OLT, each ONU starts to transmit uRLLC service according to the traditional polling sequence, and starts to transmit eMBB service after the uRLLC service transmission is completed; the transmission of the eMBB is determined according to the descending order of the number of eMBB data packets in the buffer area of each polling period, and in the process of the transmission of the eMBB, if the GRANT signal of the new polling period reaches ONUs, the transmission of the eMBB is terminated and the next polling period is started.
As shown in fig. 4, a chart of analysis of the results of a ul lc average time delay simulation experiment based on a multi-service coexistence scheduling method in a multi-polling window EPON system is provided, the square mark in the chart is a technical scheme provided by the invention, the line with the circular mark is a comparable similar method, and the triangle mark is the most classical adaptive period interleaved polling method in the EPON uplink scheduling method. The horizontal axis of the graph represents network load, the vertical axis represents average time delay of uRLLC data packets, and it can be seen from the graph that the average time delay can be kept within 250us by the method and the comparison method, and the requirement of time delay characteristics can not be completely guaranteed by the adaptive period interleaved polling method. Meanwhile, the method provided by the invention has little influence on uRLLC average time delay caused by the change of network load.
As shown in fig. 5, an analysis chart of an eMBB average time delay simulation experiment result based on a multi-service coexistence scheduling method in a multi-polling window EPON system is provided, square marks are in the figure, the line with circular marks is a comparable similar method, and triangle marks are the most classical adaptive period interleaved polling method in the EPON uplink scheduling method. The horizontal axis of the graph represents network load, the vertical axis represents average delay of the eMBB data packet, and the adaptive period interleaved polling method performs better because it only adopts one polling in one scheduling period, thus, the required guard interval is reduced, and the bandwidth utilization rate is increased. The method proposed by the invention can still keep the average delay within 4 ms.
As shown in fig. 6, in the chart of the cumulative probability distribution diagram of the delay of the ul lc packet based on the multi-service coexistence scheduling method in the EPON system with multiple polling windows, the vertical axis is the cumulative probability, the horizontal axis is the distribution of the packet delay, and the leftmost line is the probability distribution curve of the delay of the packet according to the method of the present invention, it can be seen that the reliability of all the delays of the packets is controlled to be more than 99.999% in 250us, and the reliability effect of the other two comparison schemes is obviously not good. This is also an advantage of the present invention.
Compared with the prior art, the invention has the following beneficial effects:
1. unlike traditional EPON-based uplink dynamic bandwidth allocation method, the invention can better meet the characteristic requirement of each service in the multi-service coexistence network based on the multi-service coexistence scheduling method in the multi-polling window EPON system.
2. Different from other similar methods, the processing effect of other methods on uRLLC priority and the requirement guarantee on the uRLLC service are not obvious enough, and the multi-service coexistence scheduling method based on the multi-polling window EPON system provided by the invention improves the priority of the uRLLC service by polling the uRLLC service in the first service.
3. Since the conventional dynamic bandwidth allocation algorithm is faced with high load, the ONUs at the end of the poll queue may not have available bandwidth resources, which is fatal to the reliability guarantee of the ul lc traffic in these ONUs. The multi-service coexistence scheduling method based on the multi-polling window EPON system advances the service priority of the uRLLC, and firstly allocates bandwidth to the uRLLC service data in each ONU. Therefore, under the condition of high load of the network, broadband is distributed to the uRLLC service, and the reliability of the uRLLC service can be effectively ensured.
The invention discloses a multi-service coexistence scheduling method in an EPON system based on a multi-polling window, which is used for realizing access network resource scheduling of 5G and 6G data based on an optical fiber network in the future, and the method is characterized in that the time slot resources of uplink transmission of an Ethernet passive optical network (Ethernet Passive Optical Network, EPON) are separated into a uRLLC (ultra-Reliable Low Latency Communication) transmission window and a eMBB (enhanced Mobile BroadBand) transmission window in a single polling period, and the polling of all uRLLC services in the system is finished firstly to improve the priority of the services so as to ensure the low-delay and high-reliability requirements of the services.
Example two
As shown in fig. 7, the multi-service coexistence scheduling system in the EPON system based on the multi-polling window includes the following modules:
and a bandwidth authorization module: time t 0 The OLT has mastered the internal queuing condition of each ONU buffer zone and sends GRANT signals to the ONU in the system for bandwidth authorization;
uRLLC service transmission module: each ONU immediately starts the transmission of uRLLC service according to the traditional polling sequence after receiving the GRANT signal, and a protection interval with the length of 2us is arranged between two adjacent transmitted ONUs;
a REPORT signal sending module: each ONU continuously transmits a REPORT signal after completing uRLLC data packet transmission so as to REPORT the condition and bandwidth request in each ONU buffer area; uRLLC service data and eMBB 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 time delay and reliability requirements are high, and the time delay of the mobile forwarding network is required to be controlled within 250 us; the eMBB has large traffic and low requirements on time delay and reliability, and the time delay is controlled within 4 ms; for the eMBB traffic, the priority is lower than for the ul lc traffic;
and a GRANT signal sending module: when the OLT receives the REPORT signal of the last ONU in the polling schedule, the OLT transmits a GRANT signal of a new scheduling period;
an eMBB service scheduling sequence deciding module: the OLT determines the scheduling sequence of the eMBB service of the ONU according to the descending order of the number of eMBB data packets in each ONU buffer area;
and a second round of service scheduling module: in the REPORT uploading of the last ONU and the round trip vacant time slot of the GRANT signal issued by the OLT, the ONU transmits the eMBB service, and the ONU performs the second round of scheduling for the eMBB service according to the scheduling sequence specified in the previous step; the round trip free time slot adopts 66.7us, namely the shortest time for a REPORT signal to be sent from ONU to receive GRANT;
uRLLC service transmission and entering the next scheduling period module: if the GRANT signal issued by the OLT reaches the ONU, the transmission of the eMBB is not finished yet, the transmission of the eMBB is terminated, the transmission of the uRLLC service is immediately executed, and the next scheduling period is entered;
and an uplink time delay calculation module: and carrying out uplink time delay calculation on all the data packets after uplink transmission, wherein a calculation model is as follows:
Latency＝D queuing +D processing +D transport
in the time delay calculation model, D queuing 、D processing And D transport Respectively 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 cycle is transmitted; processing delay refers to transmitting a bit of a data packet from the beginning to the end of the last bit; the transmission delay is a fixed value.
The invention is based on a DBA algorithm of the first priority of uRLLC service and further improves the priority of the uRLLC service on the basis of the prior similar technical proposal. Simulation experiment results show that the technical scheme provided by the invention is superior to the prior similar technical scheme, and the performance of the invention is more outstanding under the network condition of higher uRLLC duty ratio.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. The multi-service coexistence scheduling method in the EPON system based on the multi-polling window is characterized by comprising the following steps:
s1, at the start time t 0 The OLT has mastered the internal queuing condition of each ONU buffer zone and sends out to the ONU in the systemSending GRANT signal for bandwidth authorization;
s2, each ONU immediately starts the transmission of uRLLC service after receiving the GRANT signal;
s3, each ONU continuously transmits a REPORT signal after completing uRLLC data packet transmission so as to REPORT the condition and bandwidth request in each ONU buffer;
s4, after the OLT receives the REPORT signal of the last ONU in the polling scheduling, the OLT transmits a GRANT signal of a new round of scheduling period;
s5, the OLT determines the scheduling sequence of the eMBB service of the ONU according to the descending order of the number of eMBB data packets in each ONU buffer area;
s6, 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 transmits the eMBB service, and performs the second round of scheduling for the eMBB service according to the scheduling sequence specified in the previous step, and the step S5 is executed;
s7, if the GRANT signal issued by the OLT reaches the ONU, the transmission of the eMBB is not finished yet, the transmission of the eMBB is terminated to immediately execute the transmission of the uRLLC service and enter the next scheduling period, and the step 2 is executed;
s8, carrying out uplink time delay calculation on all the data packets after uplink transmission.
2. The multi-service coexistence scheduling method according to claim 1, wherein in S2, each ONU starts transmission of the ul lc service according to the conventional polling order immediately after receiving the GRANT signal, and there is a guard interval with a length of 2us between two adjacent transmitting ONUs.
3. The multi-service coexistence scheduling method according to claim 1, wherein in S3, the ul lc service data and the eMBB 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 time delay and reliability requirements are high, and the time delay of the mobile forwarding network is required to be controlled within 250 us; the eMBB has large traffic and low requirements on time delay and reliability, and the time delay is controlled within 4 ms; for the eMBB traffic, the priority is lower than for the ul lc traffic.
4. The multi-service coexistence scheduling method according to claim 1, wherein in S6, 66.7us is used as the round trip free time slot, i.e. the shortest time for a REPORT signal to be sent from ONU to receive GRANT.
5. The multi-service coexistence scheduling method according to any one of claims 1-4 in a multi-polling window EPON-based system, wherein S8, a calculation model is provided for the time delay calculation of each data packet, as follows:
Latency＝D queuing +D processing +D transport
in the above delay calculation model, dqueuing, dprocessing and Dtransport represent queuing delay, processing delay, and transmission delay, respectively; the queuing delay refers to the delay from one polling scheduling period to the time before the next cycle is transmitted; processing delay refers to transmitting a bit of a data packet from the beginning 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:
and a bandwidth authorization module: at time t0, the OLT has grasped the internal queuing condition of each ONU buffer, and sends a GRANT signal to the ONU in the system to perform bandwidth authorization;
uRLLC service transmission module: each ONU immediately starts the transmission of uRLLC service after receiving GRANT signal;
a REPORT signal sending module: each ONU continuously transmits a REPORT signal after completing uRLLC data packet transmission so as to REPORT the condition and bandwidth request in each ONU buffer area;
and a GRANT signal sending module: when the OLT receives the REPORT signal of the last ONU in the polling schedule, the OLT transmits a GRANT signal of a new scheduling period;
an eMBB service scheduling sequence deciding module: the OLT determines the scheduling sequence of the eMBB service of the ONU according to the descending order of the number of eMBB data packets in each ONU buffer area;
and a second round of service scheduling module: in the REPORT uploading of the last ONU and the round trip vacant time slot of the GRANT signal issued by the OLT, the ONU transmits the eMBB service, and the ONU performs the second round of scheduling for the eMBB service according to the scheduling sequence specified in the previous step;
uRLLC service transmission and entering the next scheduling period module: if the GRANT signal issued by the OLT reaches the ONU, the transmission of the eMBB is not finished yet, the transmission of the eMBB is terminated, the transmission of the uRLLC service is immediately executed, and the next scheduling period is entered;
and an uplink time delay calculation module: and carrying out uplink time delay calculation on all the data packets after uplink transmission.
7. The multi-service coexistence scheduling system according to claim 6, wherein the ul lc service transmission module is specifically as follows: each ONU immediately starts transmission of the ul lc service according to the conventional polling order after receiving the GRANT signal, and a guard interval with a length of 2us is provided between two adjacent ONUs.
8. The multi-service coexistence scheduling system according to claim 6, wherein the REPORT signaling module is specifically configured as follows: uRLLC service data and eMBB 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 time delay and reliability requirements are high, and the time delay of the mobile forwarding network is required to be controlled within 250 us; the eMBB has large traffic and low requirements on time delay and reliability, and the time delay is controlled within 4 ms; for the eMBB traffic, the priority is lower than for the ul lc traffic.
9. The multi-traffic coexistence scheduling system according to claim 6, wherein the second round of traffic scheduling module is specifically as follows: the round trip free time slot takes 66.7us, the minimum time that a REPORT signal is sent from ONU to receive GRANT.
10. The multi-service coexistence scheduling system according to any one of claims 6-9, wherein the uplink delay calculation module is specifically as follows: a calculation model is provided for the time delay calculation of each data packet, and the calculation model is as follows:
Latency＝D queuing +D processing +D transport
in the above delay calculation model, dqueuing, dprocessing and Dtransport represent queuing delay, processing delay, and transmission delay, respectively; the queuing delay refers to the delay from one polling scheduling period to the time before the next cycle is transmitted; processing delay refers to transmitting a bit of a data packet from the beginning to the end of the last bit; the transmission delay is a fixed value.
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