CN113938773A - Dynamic bandwidth allocation method for balancing time delay and throughput - Google Patents
Dynamic bandwidth allocation method for balancing time delay and throughput Download PDFInfo
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- CN113938773A CN113938773A CN202111189593.7A CN202111189593A CN113938773A CN 113938773 A CN113938773 A CN 113938773A CN 202111189593 A CN202111189593 A CN 202111189593A CN 113938773 A CN113938773 A CN 113938773A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0896—Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0086—Network resource allocation, dimensioning or optimisation
Abstract
The invention discloses a dynamic bandwidth allocation method for balancing time delay and throughput, which comprises an Optical Line Terminal (OLT), a passive distributor and a plurality of Optical Network Units (ONU), wherein the Optical Line Terminal (OLT) and the Optical Network Units (ONU) are connected through the passive distributor. When the dynamic bandwidth allocation method for balancing time delay and throughput is used, the optical line terminal OLT transmits the service message to the optical network unit ONU in a broadcast mode in the downlink direction, and the optical network unit ONU transmits the service message to the optical line terminal OLT in a burst mode in the uplink direction. In the using process of the invention, the current bandwidth using condition is judged by calculating the current passing service flow, setting the flow threshold value and monitoring the average flow of the front n rounds.
Description
Technical Field
The invention relates to the technical field of passive optical networks, in particular to a dynamic bandwidth allocation method for balancing time delay and throughput.
Background
With the development of passive optical network (passive optical network) technology, the demand of home users and enterprise users for bandwidth is increasing, and meanwhile, the demand of more and more application scenarios for time delay is decreasing, and the demand of more and more complex application scenarios for dynamic bandwidth allocation of optical line terminals (optical line terminals) is increasing. A passive optical network (passive optical network) is composed of an optical line terminal (optical line terminal), a passive distributor (passive splitter), and optical network units (optical network units), wherein the optical line terminal (optical line terminal) sends messages to the optical network units (optical network units) in a broadcast manner, the optical network units (optical network units) identify and filter and extract the messages of the unit according to id, mac, etc. in the messages, the optical network units (optical network units) send the messages to the optical line terminal (optical line terminal) in a burst manner, as shown in fig. 1, a network transmission system is formed, and the optical line terminal (optical line terminal) controls the start time and the size of a sending window of each sent message through dynamic bandwidth allocation (optical network unit). For an epon (ethernet passive optical network) system, an ONU informs an OLT of bandwidth information required by the OLT through a periodic report message, the OLT informs the ONU of obtaining the bandwidth information through a periodic gate message, the report message needs to occupy an uplink bandwidth, the more ONUs are hung below the OLT, the more report total bandwidth needs to be consumed, the less bandwidth is used by a service, and the lower the throughput of the system is.
However, in the prior art, a fixed DBA allocation period is adopted or a DBA period is manually modified to be a fixed value, so that a dynamic bandwidth allocation period is reduced, a message report sending frequency is increased, required fixed bandwidth overhead is increased, the overall throughput of the system is decreased, and time delay is decreased, otherwise, the dynamic bandwidth allocation period is increased, the report message sending frequency is decreased, required fixed bandwidth overhead is decreased, the overall throughput of the system is increased, time delay is increased, the time delay and the throughput are in a mutually exclusive relationship to a certain extent, and the relationship between the time delay and the throughput of the system cannot be balanced under the condition that service flow is too large or too small.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a dynamic bandwidth allocation method for balancing time delay and throughput, which has the advantages of balancing time delay and throughput of bandwidth allocation, and solves the problems that in the prior art, a fixed DBA allocation period is adopted or a DBA period is manually modified to be a fixed value, the dynamic bandwidth allocation period is reduced, the message report sending frequency is increased, the required fixed bandwidth expense is increased, the whole throughput of the system is reduced, the time delay is reduced, otherwise, the dynamic bandwidth allocation period is increased, the report message sending frequency is reduced, the required fixed bandwidth expense is reduced, the whole throughput of the system is increased, the time delay and the throughput are in a mutually exclusive relationship to a certain extent, and the relationship between the time delay and the throughput of the system cannot be balanced under the condition of overlarge service flow or undersize service flow.
In order to achieve the purpose, the invention provides the following technical scheme: a dynamic bandwidth allocation method for balancing time delay and throughput concretely comprises the following steps:
step A: the current DBA period of the OLT is C1, the total fixed overhead of the ONU needing to distribute the bandwidth under the OLT in the current period is calculated, and the step B is entered;
and B: subtracting the total fixed cost calculated in the step A from the total bandwidth to obtain the residual bandwidth, and entering the step C;
and C: multiplying the residual bandwidth by allocable coefficients a and b to obtain bandwidth thresholds k0 and k2, wherein k0 is smaller than k2, and respectively comparing with the currently monitored traffic m, and if the traffic m is larger than or equal to the bandwidth threshold k0 and the traffic m is smaller than or equal to the bandwidth threshold k2, entering step D; if the flow m is smaller than the bandwidth threshold k0 or the flow m is larger than the bandwidth threshold k2, entering the step E;
step D: continuously calculating cnt clear 0, keeping the current DBA period unchanged, and entering the step A;
step E: adding 1 to the continuously calculated cnt, comparing the continuously calculated cnt with the configured continuous period number n, entering the step F if the continuously calculated cnt is equal to the continuous period n while the flow m is greater than a bandwidth threshold k2, entering the step G if the continuously calculated cnt is equal to the continuous period n while the flow m is less than a bandwidth threshold k0, and entering the step A if the continuously calculated cnt is less than the continuous period n;
step F: increasing the DBA period to C2 according to the configuration period value, continuously calculating cnt clear 0 at the same time, and entering the step A;
step G: and reducing the DBA period to C0 according to the configuration period value, and continuously calculating cnt clear 0 to enter the step A.
A dynamic bandwidth allocation method for balancing time delay and throughput comprises an Optical Line Terminal (OLT), a passive distributor and a plurality of Optical Network Units (ONU), wherein the OLT and the ONU are connected through the passive distributor.
Furthermore, in the downlink direction, the optical line terminal OLT transmits the service packet to the optical network unit ONU in a broadcast manner, and in the uplink direction, the optical network unit ONU transmits the service packet to the optical line terminal OLT in a burst manner.
Furthermore, the number of the optical network units ONU is designed to be a plurality, the working temperature of the optical network units ONU is-20-60 ℃, and the minimum number of the optical network units ONULLID is not less than 1.
Furthermore, the ONU supports IEEE802.1dSTP, 802.1wRSTP and 802.1Smstp, IEEE802.3x full-duplex flow control and half-duplex flow control.
Further, the transmission rate of the downlink broadcasting mode and the uplink burst mode should not be greater than 10 Gbps.
Compared with the prior art, the invention has the beneficial effects that: when the dynamic bandwidth allocation method for balancing the time delay and the throughput is used, when the throughput of the system is small, the system can dynamically reduce the bandwidth issuing period, so that the time delay of the system is reduced while the throughput is ensured, and when the throughput is overlarge, the bandwidth issuing period can be dynamically increased, so that the throughput of the system is ensured.
In the using process of the invention, the current available service flow is calculated, the current bandwidth using condition is judged by setting the flow threshold and monitoring the average flow of the front n rounds, the optical network unit ONU periodically reports report messages to the optical line terminal OLT, and the optical line terminal OLT periodically sends GATE messages to the optical network unit ONU to complete the bandwidth interacting process. The optical line terminal OLT calculates the sum of fixed expenses required by all optical network units ONU in the current DBA period, thereby obtaining the passing service flow in the current DBA period, according to the monitored actual service flow, when the flow of the system is low, the DBA period is actively reduced, under the condition of meeting the throughput, the time delay of the system is reduced, when the flow of the system is high, the DBA period is increased, the throughput of the system is increased, and the balance of the time delay and the throughput of the system is achieved.
Drawings
Fig. 1 is a diagram of an EPON system data transmission architecture in accordance with the present invention;
FIG. 2 is a flow chart of dynamic DBA period variation according to the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
Referring to fig. 1-2 of the drawings,
the first embodiment is as follows:
step A: the current DBA period of the OLT is C1, the total fixed overhead of the ONU needing to distribute the bandwidth under the OLT in the current period is calculated, and the step B is entered;
and B: subtracting the total fixed cost calculated in the step A from the total bandwidth to obtain the residual bandwidth, and entering the step C;
and C: multiplying the residual bandwidth by allocable coefficients a and b to obtain bandwidth thresholds k0 and k2, wherein k0 is smaller than k2, and respectively comparing with the currently monitored traffic m, and if the traffic m is larger than or equal to the bandwidth threshold k0 and the traffic m is smaller than or equal to the bandwidth threshold k2, entering step D; if the flow m is smaller than the bandwidth threshold k0 or the flow m is larger than the bandwidth threshold k2, entering the step E;
step D: continuously calculating cnt clear 0, keeping the current DBA period unchanged, and entering the step A;
step E: adding 1 to the continuously calculated cnt, comparing the continuously calculated cnt with the configured continuous period number n, entering the step F if the continuously calculated cnt is equal to the continuous period n while the flow m is greater than a bandwidth threshold k2, entering the step G if the continuously calculated cnt is equal to the continuous period n while the flow m is less than a bandwidth threshold k0, and entering the step A if the continuously calculated cnt is less than the continuous period n;
step F: increasing the DBA period to C2 according to the configuration period value, continuously calculating cnt clear 0 at the same time, and entering the step A;
step G: and reducing the DBA period to C0 according to the configuration period value, and continuously calculating cnt clear 0 to enter the step A.
When the dynamic bandwidth allocation method for balancing the time delay and the throughput is used, when the throughput of the system is small, the system can dynamically reduce the bandwidth issuing period, so that the time delay of the system is reduced while the throughput is ensured, and when the throughput is overlarge, the system can dynamically increase the bandwidth issuing period, so that the throughput of the system is ensured.
In the using process of the invention, the current available service flow is calculated, the current bandwidth using condition is judged by setting the flow threshold and monitoring the average flow of the front n rounds, the optical network unit ONU periodically reports report messages to the optical line terminal OLT, and the optical line terminal OLT periodically sends GATE messages to the optical network unit ONU to complete the bandwidth interacting process. The optical line terminal OLT calculates the sum of fixed expenses required by all optical network units ONU in the current DBA period, thereby obtaining the passing service flow in the current DBA period, according to the monitored actual service flow, when the flow of the system is low, the DBA period is actively reduced, under the condition of meeting the throughput, the time delay of the system is reduced, when the flow of the system is high, the DBA period is increased, the throughput of the system is increased, and the balance of the time delay and the throughput of the system is achieved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A dynamic bandwidth allocation method for balancing time delay and throughput is characterized by comprising an Optical Line Terminal (OLT), a passive distributor and a plurality of Optical Network Units (ONU), wherein the Optical Line Terminal (OLT) and the Optical Network Units (ONU) are connected through the passive distributor, and the method further comprises the following specific use steps:
step A: the current DBA period of the OLT is C1, the total fixed overhead of the ONU needing to distribute the bandwidth under the OLT in the current period is calculated, and the step B is entered;
and B: subtracting the total fixed cost calculated in the step A from the total bandwidth to obtain the residual bandwidth, and entering the step C;
and C: multiplying the residual bandwidth by allocable coefficients a and b to obtain bandwidth thresholds k0 and k2, wherein k0 is smaller than k2, and respectively comparing with the currently monitored traffic m, and if the traffic m is larger than or equal to the bandwidth threshold k0 and the traffic m is smaller than or equal to the bandwidth threshold k2, entering step D; if the flow m is smaller than the bandwidth threshold k0 or the flow m is larger than the bandwidth threshold k2, entering the step E;
step D: continuously calculating cnt clear 0, keeping the current DBA period unchanged, and entering the step A;
step E: adding 1 to the continuously calculated cnt, comparing the continuously calculated cnt with the configured continuous period number n, entering the step F if the continuously calculated cnt is equal to the continuous period n while the flow m is greater than a bandwidth threshold k2, entering the step G if the continuously calculated cnt is equal to the continuous period n while the flow m is less than a bandwidth threshold k0, and entering the step A if the continuously calculated cnt is less than the continuous period n;
step F: increasing the DBA period to C2 according to the configuration period value, continuously calculating cnt clear 0 at the same time, and entering the step A;
step G: and reducing the DBA period to C0 according to the configuration period value, and continuously calculating cnt clear 0 to enter the step A.
2. The method of claim 1 for dynamic bandwidth allocation with balanced latency and throughput, wherein: and the downlink direction of the optical line terminal OLT transmits the service message to the optical network unit ONU in a broadcasting mode, and the uplink direction of the optical network unit ONU transmits the service message to the optical line terminal OLT in a burst mode.
3. The method of claim 1 for dynamic bandwidth allocation with balanced latency and throughput, wherein: the optical network units ONU are designed in a plurality of quantities, the working temperature of the optical network units ONU is-20-60 ℃, and the minimum number of the ONU LLIDs is not less than 1.
4. The method of claim 1 for dynamic bandwidth allocation with balanced latency and throughput, wherein: the ONU supports IEEE802.1dSTP, 802.1wRSTP and 802.1Smstp, IEEE802.3x full-duplex flow control and half-duplex flow control.
5. The method of claim 2 for dynamic bandwidth allocation with balanced latency and throughput, wherein: the transmission rate of the downlink broadcasting mode and the uplink burst mode is not more than 10 Gbps.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20070060368A (en) * | 2005-12-08 | 2007-06-13 | 삼성전자주식회사 | System and method for bandwidth allocation in gpon |
| CN101667962A (en) * | 2009-10-14 | 2010-03-10 | 天津大学 | Dynamic bandwidth allocation method for self-adapting service quality assurance in Ethernet passive optical network |
| CN112911421A (en) * | 2019-12-04 | 2021-06-04 | 中国电信股份有限公司 | Dynamic bandwidth allocation method and device, passive optical fiber network and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070060368A (en) * | 2005-12-08 | 2007-06-13 | 삼성전자주식회사 | System and method for bandwidth allocation in gpon |
| CN101667962A (en) * | 2009-10-14 | 2010-03-10 | 天津大学 | Dynamic bandwidth allocation method for self-adapting service quality assurance in Ethernet passive optical network |
| CN112911421A (en) * | 2019-12-04 | 2021-06-04 | 中国电信股份有限公司 | Dynamic bandwidth allocation method and device, passive optical fiber network and storage medium |
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