CN1585403A - Service quality controlling method for light Internet network - Google Patents

Abstract

A quality of service control method for an optical Internet network, which adopts a unified service differential processing method based on multi-protocol label switching technology, performs integrated access control on services, classifies them according to priorities, and automatically maps according to different granularity and different priorities To different service interfaces, at the same time automatically adjust the control method according to the status of network resources, and perform flexible bandwidth resource allocation. The present invention organically integrates IP layer technology and optical layer technology related to QoS control, introduces inter-layer service aggregation/broadcasting and self-adaptive inter-layer service mapping and virtual topology adaptation/reconfiguration technology, and can provide multiple Provide corresponding quality of service guarantees for various media service flows, and at the same time achieve higher utilization of network resources.

Description

Quality of Service Control Method for Optical Internet

technical field

The invention relates to a service quality control method of an optical Internet network, which can ensure network service quality, optimize network resource allocation, and improve network resource utilization, belonging to an optical Internet network (IP over WDM network)

technology field.

Background technique

The optical Internet will become the basic transmission platform of the next generation network (NGN), on which multiple media services including data, voice and video will be provided at the carrier level. In order to avoid contention of network resources and meet specified business service quality, differential and fair resource allocation, management and scheduling schemes are required on the public network platform, that is, network quality of service (QoS) guarantee method.

At present, the optical Internet uses overlapping/separated QoS control technology to optimize the use of network resources at the electrical (IP) layer and optical (WDM) layer, and the inter-layer/internet QoS coordination mechanism is static or semi-static, for example: business QoS The mapping control and management of parameters is carried out through manual configuration or optical user network interface (O.UNI), mainly relying on the centralized network management system, and its defects are reflected in: 1) The overlapping/separated QoS control mechanism cannot adapt to the network resource status Dynamically changing characteristics. In the network, the available bandwidth, packet loss rate (PLR), congestion and other network states are dynamically changing, and the change process is random, which requires the entire network QoS control mechanism to monitor the network state changes of each layer in real time and dynamically Adjusting the QoS control strategy means being able to adapt to resource state changes. Obviously, static inter-layer QoS configuration and management control cannot be satisfied; allocation, often resulting in low resource utilization or network congestion. Due to the lack of necessary coordination and resource management mechanisms for inter-layer QoS, often when the business load is heavy, the quality of business services it provides is significantly reduced, so the resource allocation, control and management schemes of the entire network are inefficient; 3) single-layer The QoS control mechanism (whether it is the electrical layer or the optical layer) cannot meet the various requirements of broadband multimedia service transmission performance alone. A single QoS control mechanism is limited to optimizing certain (certain types) of services, and a QoS control mechanism suitable for all services does not exist.

Therefore, in order to meet the transmission requirements of various types of services, it is necessary to integrate the QoS control technology of the optical layer and the electrical layer in the optical Internet, and organically combine various QoS mechanisms to obtain an integrated QoS solution with high performance and low cost. With the introduction of the general multi-protocol label switching (GMPLS) technology into the optical Internet at present, integrated QoS control has become a possibility.

Contents of the invention

The purpose of the present invention is to aim at the shortcoming of the separation/overlapping QoS control model of current optical Internet, provide a kind of quality of service control method of optical Internet, adapt to integrated optical Internet architecture model and multi-granularity photoelectric hybrid router node The model can meet the business transmission requirements of various media types and granularities, and efficiently provide corresponding quality of service guarantees for the transmission of various media service flows.

In order to achieve such purpose, in the method of the present invention, adopt a) the unified service difference processing method based on GMPLS, it merges optical layer QoS technology and electrical layer QoS technology, adopts the QoS control of different levels automatically for different types of business technology; b) integrated access control method; c) flexible and concise business classification and optical path classification method; d) adaptive business mapping method; e) optimized bandwidth resource allocation method. It organically integrates IP layer technology and optical layer technology related to QoS control, and introduces inter-layer service aggregation/broadcasting and self-adaptive inter-layer service mapping and virtual topology adaptation/reconfiguration technology, which can transmit multiple The media service flow provides corresponding quality of service guarantee, and at the same time obtains a higher utilization rate of network resources.

The QoS control method of the present invention integrates the functions of electrical layer QoS processing and optical layer QoS processing, and realizes automatic adaptation, management and control of interlayer service QoS, such as automatic adaptation to services of different granularities and different priorities, and based on network resources. , link load, etc., and automatically perform service admission control and bandwidth resource allocation. The present invention mainly includes the following key operations: 1) Integrated Admission Control (IAC), which is not only applied at the packet (flow) level but also at the optical path level. In the process of admitting business flows, the transmission quality of the optical path must be considered. WDM Features such as link bandwidth utilization. In addition, because all packet services are transmitted on the optical path, it also takes into account the limitation of node packet processing capabilities, packet loss rate, delay, jitter and other electrical layer QoS indicators; 2) Adaptive service/optical path classification and mapping, mainly Classify the priority of application layer business and optical path, and dynamically combine the QoS control mechanism of optical layer and electrical layer according to the utilization status of network resources to perform service mapping operation; 3) Flexible bandwidth resource allocation and scheduling, mainly to complete various Different from the general packet scheduling algorithm, it can directly dispatch services to the optical layer for transmission, or guide them to the electrical layer for forwarding. It is mainly based on The business feature and policy manager completes the allocation of bandwidth at different granularities and the effective utilization of network resources.

Control method of the present invention mainly comprises following concrete steps:

Step 1: Set bandwidth control threshold parameters;

According to the input of the network management personnel of the network operator, configure the bandwidth control threshold parameters to control subsequent service classification and service mapping operations.

The second step: update the network resource database;

The system starts the control plane process, including routing and link management sub-processes, and maintains and updates the network resource database through the Optical Extended Shortest Path First Routing Protocol (OSPF-TE) and Link Management Protocol (LMP).

The third step: business integration access control;

According to service quality requirements such as bandwidth, packet loss rate, delay, and jitter of business flows, and according to the current network resource usage status, it not only considers optical layer resources, such as optical path transmission quality, wavelength division multiplexing (WDM) link bandwidth, etc. , and also consider the resources of the electrical layer, such as node packet processing capacity limit, virtual link bandwidth and other indicators, to determine whether to allow service access.

The fourth step: business classification;

The business classification method of the present invention includes electrical layer business service level classification and optical layer business service level classification. Electrical-layer business service levels are divided into three categories: 1) Service level services requiring hard QoS guarantees, which require strict delay and jitter guarantees (service type A); 2) Service level services requiring soft QoS guarantees, which require statistics Guaranteed requirements for time delay and jitter in the sense (service type B); 3) traditional best-effort (BE) service level service (service type C) is required. The classification of the optical path service level is mainly based on the transmission performance of the optical path. The present invention divides the optical path into two categories: 1) high quality (HQ) optical path service level (mainly bearing high priority services, etc.); 2) low quality (LQ) Optical path service level (mainly carrying low-priority services, etc.).

The fifth step: business mapping;

According to the above classification of business service levels, the present invention designs an integrated business dynamic mapping method, which respectively includes a business vertical mapping method and a business horizontal mapping method.

(a) The service vertical mapping method is an adaptive dynamic service mapping method, which maps different types of services to different service interfaces, and its QoS processing methods are different. At the electrical layer service mapping level, different QoS mapping methods are adopted for each type of service, and each service can be dynamically mapped according to the service bandwidth granularity and rate type (such as fixed bit rate/variable bit rate). For example: virtual private network (VPN) service, circuit emulation service (CES), packet voice relay service, etc. are mapped to the service level (service type A) guaranteed by hard QoS; for packet voice relay service, digital TV service ( DTV), grid computing services, partial storage services (content distribution) services, etc. are mapped to the service level (service type B) guaranteed by soft QoS; for content storage, content distribution services; traditional best-effort and other types of data services, etc. onto the BE service class (service type C). At the optical layer service mapping level, the service level guaranteed by hard QoS (service type A) is directly mapped to the high quality (HQ) optical path service level; according to the service bandwidth control threshold, the service level guaranteed by soft QoS (service type A) can be Mapped to low quality (LQ) optical path service class or high quality (HQ) optical path service class; BE service class (service type C) is directly mapped to low quality (LQ) optical path service class. Simultaneously, the mapping scheme of the present invention can adopt different mapping methods according to different bandwidth granularities (setting the bandwidth threshold), that is, if it is greater than the threshold, it is mapped to a high-priority service level, otherwise it is mapped to a low-priority service level.

(b) The business level mapping method combines the advantages of electrical (packet) switching technology with the advantages of optical (line) switching technology, and designs three business level mapping schemes, which include: 1) single-hop (optical path) mapping; 2) virtual Circuit (multi-hop) mapping; 3) datagram mapping method, etc. At the same time, the service level mapping also adopts a hybrid mapping method, that is, a flexible mapping scheme is adopted according to the service level and bandwidth granularity. In the virtual circuit mode of packet switching technology, the connection request of high-speed and high-priority services (such as large-bandwidth streaming media services and circuit emulation services, etc.) adopts a single-hop (optical path) mapping method.

Step 6: bandwidth resource allocation;

The present invention adopts following bandwidth resource allocation method:

(a) For the type of service flow (class A service) that requires hard QoS guarantee, the peak bandwidth admission control method is adopted. That is, if there is a through high-quality (HQ) optical path, if it is satisfied, then admit it; otherwise, create a through HQ optical path, and reject the connection request if the creation fails.

(b) For the type of service flow requiring soft QoS guarantee (Type B service), an effective bandwidth admission control method based on rate encapsulation multiplexing (REM) technology is adopted. Service type B represents most of the real-time streaming media services. Due to the large difference in granularity, such as packet voice (VoIP) and digital television (DTV) services, different QoS is adopted for type B service flows with different bandwidth granularities control method, a bandwidth control threshold S _{b, th} is designed for this purpose, and for the service flow whose effective bandwidth exceeds S _{b, th} , it is mapped to a high-quality optical path (usually a single hop), otherwise it is mapped to a low-quality On an optical path (generally multi-hop), if the existing optical path cannot meet the bandwidth requirement, a new optical path will be created, and if the creation fails, the connection request will be rejected.

(c) For best-effort (BE) type service flow (C class service), adopt the minimum bandwidth admission control method, only guarantee the minimum bandwidth of the access service, and adopt closed-loop control and fair sharing technology among BE services to maximize improve the throughput of the network. This type of service represents most of the non-real-time data services, such as file transfer (FTP), WWW, and background storage data services. This type of service is generally only transmitted on the multi-hop LQ optical path, and cannot actively create an optical path. That is, if there is an LQ optical path that meets its minimum bandwidth requirement, it will be admitted; otherwise, the connection request will be rejected directly.

Step 7: Configure the bandwidth resources of the optical layer and the electrical layer;

Configure the bandwidth resources of the optical layer and the electrical layer through the extended resource reservation protocol (RSVP-TE), and update the network resource database.

Compared with the traditional separation/overlapping QoS control mechanism, the control method of the present invention can obtain higher network resource utilization and optimized network service quality, and also reduce the complexity of network QoS control, and has very good practicability . Its advantages are:

·Optoelectronic integrated service differential service method: it integrates optical layer QoS technology and electrical layer QoS technology in one, and automatically adopts different levels of QoS control technology for different types of services. The electrical layer QoS technology adopts virtual circuit differential technology to ensure QoS, and is mainly used for service quality control of small granularity, variable rate, and medium and low priority services. The optical layer QoS control based on the wavelength switching technology is simple and easy to implement, and because it does not require a buffer, it is generally used for the service quality control of large granularity, constant rate (CBR), and high priority services.

Intelligent QoS control of multi-granularity services: Under this control scheme, the optical Internet can automatically provide three forms of transmission services with guaranteed QoS: 1) wavelength and sub-wavelength circuit services (for example, large-scale real-time streaming media 2) virtual circuit services of various granularities (real-time services, high-reliability data services, etc.); 3) and connectionless datagram services (traditional BE services, etc.). This solution can automatically provide appropriate QoS mapping and transmission services for each type of business according to requirements.

Can meet the carrier-grade applications of the next generation of optical Internet: can support various types of circuit emulation services (CES), and the transmission of various types of granularity types of services, service classification, optical path classification, service mapping and bandwidth allocation methods are relatively simple and scalable good.

Description of drawings

Figure 1 is a multi-service integrated optical Internet network.

Fig. 2 is a schematic diagram of a multi-granularity photoelectric hybrid router node structure.

Fig. 3 is a schematic diagram of a service difference processing method in the present invention.

Fig. 4 is a schematic diagram of the integrated service dynamic mapping method in the present invention.

In Fig. 4, a is a schematic diagram of a vertical mapping method for services, and b is a schematic diagram of a horizontal mapping method for services.

Fig. 5 is a flow chart of the method of the present invention.

Detailed ways

The specific implementation manner of the present invention relates to FIG. 1 to FIG. 5 , which will be introduced one by one in order below.

The invention is mainly applied in the next generation multi-service optical Internet network. Figure 1 is a typical next-generation multi-service integrated optical Internet network. Its backbone part is an integrated optical Internet network, which is formed by interconnecting multiple multi-granularity photoelectric hybrid routers through optical wavelength division multiplexing (WDM) links. . At the same time, its edge part is composed of business aggregation networks such as telephone network (via media gateway), traditional IP network, wireless network, metropolitan area network (MAN), storage network (SAN), and content distribution network (CDN). The integrated optical Internet network is responsible for providing transmission services for various types of edge aggregation networks, and at the same time guarantees the quality of its transmission services.

Multi-granularity photoelectric hybrid router is the core node in the integrated optical Internet shown in Figure 1, and it is also the carrier of running the integrated QoS control method of the present invention, and its structure is as shown in Figure 2, consists of Optical Switching Fabric (OSF), Optical backplane (OB), electrical switch fabric (ESF), line cards, etc. Optical signals from the group interface - optical label switched path (OLSP) and electrical signals - electrical label switched path (ELSP) from the branch interface are aggregated and groomed within the integrated switch fabric (ISF). Generally speaking, inside the optical router, multiplexing from multiple ELSPs to one OLSP is called aggregation, and demultiplexing from one OLSP to multiple ELSPs is called dredging.

FIG. 3 is a specific implementation of the distributed service differential processing method of the present invention, which involves multiple distributed operating components and mutual interaction processes, and all operating components exist in optical router nodes (see FIG. 2 ). Service classification is the basis of all service QoS operations. The service classification method mainly adopts corresponding QoS resource allocation methods for different priority types of services, such as priority bandwidth allocation, priority route selection, priority queuing, priority protection/recovery, etc., so as to provide The application layer business flow provides the corresponding quality of service level. Considering the principles of scalability and practicability, the number of business service levels should be relatively small. For this reason the present invention has designed following business classification and light path classification scheme, see table 1 and table 2 respectively (they are the concrete implementation of business classification method), wherein the classification of light path service level is mainly based on the transmission performance (bit error) of light path rate-BER index). The service classification operation part performs differential service classification according to Table 1, and the optical path classification operation part performs differential optical path classification according to Table 2.

Table 1. IP layer service level classification service level business type bandwidth requirements Latency/Jitter/Packet Loss queuing mechanism A Service level services that require hard QoS guarantees (for example: circuit emulation, virtual network tunnels, etc.) Peak Bandwidth Guaranteed Minimize latency, jitter and packet loss probability Preferably no queuing (single hop) B Service levels that require soft QoS guarantees (for example: streaming media services, etc.) effective bandwidth ensure Latency, jitter, and packet loss have upper bounds Minimize queuing (business guidance) Excess do not guarantee C Need traditional BE service level business (for example: E-mail, background content storage, etc.) Guaranteed only minimum bandwidth or only connectivity no guarantee Queue as much as possible (make full use of virtual link resources)

Table 2. Optical layer service level classification service level business type BER performance survival needs safety Preemptibility A High-quality optical path service level (for example: optical virtual network, etc.) ＞10 ^-9 (full load) 50ms1+1/1:1 optical path protection make sure non-preemptible B Low-quality optical path service level (for example: traditional data, etc.) ＞10 ^-5 (full load) Optical path recovery or no protection not sure Preemptible

In Figure 3, within the unified control plane based on Generalized Multiprotocol Label Switching (GMPLS), there are integrated admission control mechanism, integrated routing calculation, integrated resource reservation, integrated survivability mechanism, global traffic engineering database, etc. Among them, the integrated routing calculation involves operations such as wavelength routing assignment (RWA) and constrained routing (CBR). In the multi-granularity forwarding plane, it involves service classification operation, service mapping operation, service scheduling management; service grooming, optical path classification operation, optical path mapping operation, and optical path transmission operation, etc. The operations involved in the forwarding plane are under the integrated control and management of the distributed GMPLS control plane. The specific working process is as follows: First, each optical router in the optical Internet network obtains the network topology and resource database (TEDB) according to the optically extended routing protocol (for example, OSPF-TE and LMP) for integrated admission control mechanism, integrated QoS routing Operation modules such as computing, integrated resource reservation, and integrated survivability mechanism are used. When a business connection request arrives (both from the application layer), the business classification operation must be performed first, and then the business mapping operation is invoked according to the classification result to map the business to different processing strategies. Different business processing schemes are completed by business scheduling management, or are directly dispatched to the optical path, enter the optical path mapping operation, or are dispatched to the service grooming, and then enter the optical path mapping operation, and finally complete the service transmission by the optical path transmission operation, where the optical path classification The operation is responsible for classifying newly created lightpaths. Unified control plane coordination and QoS mapping between control layers and virtual topology reconfiguration, and efficient business grooming to allocate resources reasonably. In Fig. 3, the dotted lines connected to the various operating components represent input parameters.

Figure 3 integrates the electrical layer QoS processing and optical layer QoS processing functions, which can realize inter-layer QoS automatic adaptation, management and control, such as automatic adaptation to services with different granularities and different priorities, and network resources and link loads , Automatically perform service integration admission control (IAC). It adopts a cross-layer resource control strategy to implement QoS control and differential service supply, so that network resources (optical layer, electrical layer, and interface units, etc.) can be optimally utilized. The service difference processing method of Fig. 3 has three key places: 1) integrated admission control (IAC) is not only applied in the packet service flow level but also applied in the optical path level (seeing Fig. 3 connection), in the admission service process, must QoS characteristics such as optical path transmission quality (BER), WDM link bandwidth utilization rate, etc. should be considered. In addition, because all packet services are transmitted on the optical path, the limitation of packet processing capacity, packet loss rate, delay, jitter and other electrical layer QoS indicators must also be considered; 2) The adaptive service/optical path classification and mapping method is mainly to apply Classify the priority of services and optical paths, and dynamically combine the QoS control mechanism of the optical layer and the electrical layer for service mapping according to the utilization status of network resources; 3) Flexible bandwidth resource allocation and scheduling, business scheduling and grooming are mainly completed Different priority/granularity business bandwidth allocation, different from the general packet scheduling algorithm, it can directly dispatch the business to the optical layer for transmission, or guide it to the electrical layer for forwarding, it is mainly based on business characteristics and policy management The router completes the adaptation of bandwidth at different granularities and the effective utilization of network resources.

According to the classification methods of business service levels in Table 1 and Table 2, Figure 4(a) is the specific implementation of the business vertical mapping method, which is an adaptive dynamic mapping model, and only eight typical services are given here The types are: virtual private network (VPN) service; circuit emulation service (CES); packet voice relay service (VoIP); digital television service (DTV); grid computing service; storage service (content distribution) service; free Trial multimedia services; traditional BE type data services, etc. At the service-to-IP layer service mapping level, different QoS mapping methods are adopted for each type of service, and each service can perform dynamic service mapping according to the service bandwidth granularity and rate type (for example, fixed bit rate/variable bit rate) . For example: virtual private network (VPN) service, circuit emulation service (CES), packet voice relay service, etc. are mapped to the service level (service type A) guaranteed by hard QoS; for packet voice relay service, digital TV service ( DTV), grid computing services, some storage services (content distribution) services, etc. are mapped to the service level (service type B) guaranteed by soft QoS; for storage services (content distribution) services, free trial multimedia services; traditional BE type Data services etc. are mapped to the BE service level (service type C). At the optical path mapping level, the service level guaranteed by hard QoS (service type A) is directly mapped to the high quality (HQ) optical path service level; according to the service bandwidth granularity threshold, the service level guaranteed by soft QoS (service type A) can be mapped to On the low quality (LQ) optical path service class or the high quality (HQ) optical path service class; the BE service class (service type C) is directly mapped to the low quality (LQ) optical path service class. While ensuring the service quality of the business, the utilization rate of network resources should be improved as much as possible, so there must be a dynamic business for various granularities (narrowband, broadband) and various types of business (including voice, video, data and multimedia applications) Mapping processing mechanism. For this reason, the present invention adopts different mapping strategies according to different bandwidth granularities (setting the bandwidth threshold), that is, if the bandwidth is greater than the threshold, it is mapped to a high-priority service class, otherwise it is mapped to a low-priority service class.

Figure 4(b) is the specific implementation of the service level mapping method, which combines the advantages of electrical switching technology and optical switching technology. There are typically three service level mapping methods, which include: single-hop (optical path) mapping; virtual circuit (multi-hop) mapping; datagram connectionless mapping, etc. The business level mapping model shown in Figure 4(b) adopts a hybrid mapping strategy, that is, according to the business service level and bandwidth granularity, the low-rate and low-priority business requests adopt the virtual circuit method of packet switching technology, or even the best-effort transmission method , for example: low-cost data services and streaming media services, etc. High-rate and high-priority connection requests adopt optical path switching, for example, single-hop optical path mapping is used for streaming media and circuit emulation services with large bandwidth. For each service flow connection request from the source optical router node, the integrated admission control operation (IAC) of the intermediate optical router node will decide whether to accept the request according to the service classification method shown in Table 1 and network resource conditions. Once it is decided to accept the request, the adaptive service mapping and grooming operation will dynamically map the service connection to different types of queuing systems, for example: directly reach the destination optical router node through high-quality (HQ) optical path logic queue scheduling, or directly reach the destination optical router node through low-quality (LQ) The optical path logical queue scheduling arrives at the next-hop optical router node, and the next-hop optical router node repeatedly performs the above operations. The queuing system corresponding to the dynamically reconfigurable traffic engineering link group corresponds to different types (single-hop, multi-hop, HQ and LQ) of optical path connections (see Table 2).

Fig. 5 is the specific implementation steps of the integrated QoS control method of the present invention:

The first step: configure the bandwidth control threshold S _{b, th} parameters;

According to the input of the network management personnel of the network operator, the bandwidth control threshold parameter S _b,th is set, which is mainly used to control subsequent service classification and service mapping operations.

Step 2: update the network resource database (TEDB);

The system starts the control plane process, including routing and link management sub-processes, and maintains and updates the network resource database (TEDB) through the Optical Extended Shortest Path First Routing Protocol (OSPF-TE) and Link Management Protocol (LMP).

The third step: business integration access control;

According to service quality requirements such as bandwidth, packet loss rate, delay, and jitter of business flows, and according to the current network resource usage status, it not only considers optical layer resources, such as optical path transmission quality, wavelength division multiplexing (WDM) link bandwidth, etc. , and also consider the resources of the electrical layer, such as node packet processing capacity limit, virtual link bandwidth and other indicators, to determine whether to allow service access.

Step 4: Classify the business flow according to the business classification methods in Table 1 and Table 2; determine the type of business flow (four categories);

For Type B service flows that require soft QoS guarantees, it represents most of the real-time streaming media services. Due to the large difference in granularity, such as streaming media services, for Type B service flows with different bandwidth granularities, different methods are adopted. For the QoS control method, a bandwidth control threshold S _{b, th} is designed for this purpose. For the service flow whose effective bandwidth exceeds S _{b, th} , it is mapped to a high-quality optical path (usually a single hop), otherwise it is mapped to a low-quality On the optical path (usually multi-hop), if the existing optical path cannot meet the bandwidth requirement, it will trigger the creation of a new optical path, and if the creation fails, the connection request will be rejected.

Step 5: Perform a mapping operation on the business flow according to the specific business mapping method shown in Figure 4(a) and Figure 4(b);

Step 6: bandwidth resource allocation;

For different types of priority services, corresponding bandwidth resource allocation methods are adopted to provide corresponding service quality for application service flows. The specific implementation methods are as follows:

(a) For service type A, it requires hard QoS guarantee, and adopts the peak bandwidth admission control method, that is, to judge whether there is a direct-connected single-hop HQ optical path, satisfying the following formula:

$\underset{\mathrm{<span\; class="notranslate">\; i</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}^{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; +</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}^{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; new</span>}}^{\mathrm{<span\; class="notranslate">\; f</span>}}$

Then continue, otherwise call the integrated routing algorithm to calculate the single-hop HQ optical path, and then judge whether it is successful, if the creation fails, reject the call, otherwise continue. Among them, C marks the optical path rate, V _a ^f marks the peak rate of service flow of type A, V _{a and new} ^f mark the peak rate of the current requested service flow, E _b ^f marks the effective bandwidth of service flow of type B, and i and j mark the current Number of Type A service flows and Type B service flows on the selected HQ optical path.

(b) For service type B (the bandwidth is greater than the set S _{b, th} ), first calculate the effective bandwidth based on the rate encapsulation (REM). The effective bandwidth calculation method of the type B service flow is as follows (this method can ensure that the type B service flow meets given packet loss probability):

in:

$\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; log</span>}}_{\mathrm{<span\; class="notranslate">\; 10</span>}}{\mathrm{<span\; class="notranslate">\; PLR</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{\mathrm{<span\; class="notranslate">\; 50</span>}}$ $\mathrm{<span\; class="notranslate">\; and</span>}$ ${\mathrm{<span\; class="notranslate">\; z</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; =</span>\frac{{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; log</span>}}_{\mathrm{<span\; class="notranslate">\; 10</span>}}{\mathrm{<span\; class="notranslate">\; PLR</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{{\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; peak</span>}}^{\mathrm{<span\; class="notranslate">\; f</span>}}}$

In addition, V _{b , average} ^f , V _{b , peak} ^f mark the average rate and peak rate of the type B service flow respectively.

Then judge whether there is a direct-connected single-hop HQ optical path that meets the effective bandwidth requirement, if so, continue, otherwise transfer to call the integrated routing algorithm to calculate the single-hop HQ optical path, and continue.

(c) For business type B (the bandwidth is less than the set S _{b, th} ), first calculate the effective bandwidth based on the rate encapsulation (REM), and then judge whether there is a direct-connected single-hop LQ optical path that meets the effective bandwidth requirement, if not, continue to judge Check whether the multi-hop HQ optical path meets the effective bandwidth requirement. If not, go to call the integrated routing algorithm to calculate the single-hop HQ optical path and continue.

(d) For business type C, business type C represents most non-real-time data services, such as file transfer, WWW, and background storage data services. According to the previous assumption, this type of service is generally only transmitted on the multi-hop LQ optical path, and the optical path cannot be actively created. That is, to determine whether the multi-hop LQ optical path of the service flow meets its minimum bandwidth requirement, then determine whether the following formula is satisfied:

$\underset{\mathrm{<span\; class="notranslate">\; m</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}^{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; min</span>}}$

If so, continue, otherwise reject the call. Among them, m and n indicate the number of type B service flows and the number of type C service flows on the currently selected LQ optical path respectively, and V _{c and min} indicate the minimum rate guaranteed bandwidth of type C service flows.

Step 7: Configure the bandwidth resources of the optical layer and the electrical layer;

Configure the bandwidth resources of the optical layer and the electrical layer through the extended resource reservation protocol (RSVP-TE), and update the network resource database.

Claims (1)

1, a kind of method for controlling quality of service of optical internet network is characterized in that comprising following concrete steps:

1) bandwidth control threshold parameter is set: according to Virtual network operator webmaster personnel input, configured bandwidth control threshold parameter is used to control follow-up business classification and professional map operation;

2) the network resource data storehouse is upgraded: system start-up control plane process comprises route and link management subprocess, by shortest path priority route protocol and the LMP Link Manager Protocol maintenance and the renewal network resource data storehouse of light expansion;

3) business integration access control: according to the QoS requirement of Business Stream, and, take all factors into consideration the resource of photosphere and the resource of electricity layer, judge whether to allow service access according to the current network resources behaviour in service;

4) professional classification: professional classification comprises the classification of electric layer service grade of service classification photoreactive layer business service grade, the electricity layer service grade of service is divided into three major types: the grade of service that the hard QoS service quality of needs guarantees is professional to be category-A, the grade of service business that needs soft QoS to guarantee be category-B, and needing the tradition grade of service business of doing one's best is the C class; The classification of the light path grade of service is divided into the high-quality light path grade of service of main carrying high-priority service and the low quality light path grade of service two big classes of main carrying low priority traffice;

5) professional mapping: comprise professional vertical mapping method and professional skill mapping method, professional vertical mapping is mapped to different service interfaces with different kinds of business, its QoS processing method difference, on electricity layer map of services aspect, take different QoS mapping methods for every type of business, every kind of business can be carried out dynamic professional mapping according to service bandwidth granularity and speed type, on photosphere map of services aspect, the A service that guarantees for hard QoS maps directly to the high-quality light path grade of service, the b service that soft QoS guarantees can be mapped on the low quality light path grade of service or the high-quality light path grade of service, the do one's best c service of the grade of service of tradition maps directly on the low quality light path grade of service, simultaneously take different mapping methods according to the different bandwidth granularity, promptly greater than bandwidth control thresholding, be mapped to the higher priority service grade, otherwise be mapped to the low priority service grade; The professional skill mapping comprises the mapping of single-hop light path, the mapping of virtual circuit multi-hop, datagram mapping mode, also adopt simultaneously and mix mapping method, promptly take mapping method flexibly according to business service grade and bandwidth granularity, for the virtual circuit mode of low rate low priority traffice request employing packet-switch technology, two-forty high-priority service connection request adopts single-hop light path mapping mode;

6) bandwidth resource allocation: the A service for the hard QoS of needs guarantees, adopt the peak bandwidth admittance control method, if promptly there is a straight-through high-quality light path, satisfied then access, otherwise, a straight-through high-quality light path created, if create failure, then refuse this connection request; B service for the soft QoS assurance of needs, employing is based on the effective bandwidth admittance control method of speed encapsulation multiplex technique, for this class Business Stream of different bandwidth granularity, design a bandwidth control thresholding, surpass the Business Stream of control thresholding for effective bandwidth, it is mapped on the high-quality light path, otherwise be mapped on the low-quality light path,, then trigger and create new light path if existing light path can't satisfy bandwidth demand, if create failure, then refuse this connection request; For the c service of best effort class, adopt the minimum bandwidth admittance control method, only guarantee the minimum bandwidth of access service, satisfy then access of its minimum bandwidth requirement, otherwise directly refuse this connection request;

7) bandwidth resources of configuration photosphere and electric layer:, and upgrade the network resource data storehouse by the RSVP configuration photosphere of light expansion and the bandwidth resources of electric layer.

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