WO2010009677A1 - 预订路径的方法、系统及路径计算客户、路径计算单元 - Google Patents

预订路径的方法、系统及路径计算客户、路径计算单元 Download PDF

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Publication number
WO2010009677A1
WO2010009677A1 PCT/CN2009/072904 CN2009072904W WO2010009677A1 WO 2010009677 A1 WO2010009677 A1 WO 2010009677A1 CN 2009072904 W CN2009072904 W CN 2009072904W WO 2010009677 A1 WO2010009677 A1 WO 2010009677A1
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Prior art keywords
path
subscription service
request message
information
path calculation
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PCT/CN2009/072904
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English (en)
French (fr)
Inventor
章发太
李丹
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华为技术有限公司
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Publication of WO2010009677A1 publication Critical patent/WO2010009677A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic control in data switching networks
    • H04L47/70Admission control; Resource allocation
    • H04L47/82Miscellaneous aspects
    • H04L47/826Involving periods of time
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic control in data switching networks
    • H04L47/70Admission control; Resource allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic control in data switching networks
    • H04L47/70Admission control; Resource allocation
    • H04L47/72Admission control; Resource allocation using reservation actions during connection setup

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and system for subscribing a path, and a path calculation client and a path calculation unit.
  • a method for providing a subscription service service in an Automatically Switched Optical Network (ASON) based on a Generalized Multiprotocol Label Switching (GMPLS) control plane is mainly through an extended signaling protocol, that is, based on traffic engineering.
  • the establishment of a subscription service is implemented by means of the Extended Resource Reservation Protocol (RTVP-TE).
  • RTVP-TE Extended Resource Reservation Protocol
  • the node on the path initiates signaling to establish a connection, and the node carries the time constraint information according to the Path/Reserve message generated by the RSVP-TE, and each node receives the time constraint information.
  • the corresponding resources are reserved, and each node passes the corresponding time constraint information in the Path/Reserve message to implement the establishment of the subscription service.
  • the Path State Block (PSB) and the Reserve State Block (RSB) in the prior art are required.
  • PSB Path State Block
  • RSB Reserve State Block
  • the time information irrelevant to the resource is refreshed, the signaling burden is increased, and the subscription service cannot be opened quickly and conveniently.
  • the prior art does not clarify the corresponding routing scheme, that is, how to implement the routing calculation of the subscription service, and the other is to specify the corresponding resources through the network management, so that the advantages of the control plane automation cannot be realized; another possibility is to extend the route.
  • the protocol advertises the time characteristics of the traffic engineering (TE) link in the routing protocol. This greatly increases the complexity of the routing and does not enable fast and convenient provisioning of subscription services.
  • TE traffic engineering
  • the embodiment of the present invention provides a method, a system, and a path calculation client and a path calculation unit for subscribing a route, so as to implement a subscription service quickly and conveniently.
  • the embodiment of the present invention provides the following technical solutions:
  • a method of subscribing to a path including:
  • the path sends the calculated path information of the subscription service to the path calculation client.
  • a method of subscribing to a path including:
  • the path information of the subscription service is calculated by the path calculation unit according to the time attribute parameter and the traffic engineering data information and the existing subscription service connection information.
  • a system for subscribing to a path including:
  • a path calculation client configured to generate a subscription service request message, where the subscription service request message includes a time attribute parameter, and send the subscription service request message to the path calculation unit;
  • a path calculation unit configured to receive a subscription service request message sent by the path calculation client, and calculate, according to the time attribute parameter and the traffic engineering data information and the existing subscription service connection information, the subscription service requested by the subscription service request message
  • the path sends the calculated path information of the subscribed service to the path calculation client.
  • a path calculation customer including:
  • a request message generating module configured to generate a subscription service request message, where the subscription service request message is generated Include time attribute parameters;
  • a request message sending module configured to send the subscription service request message generated by the request message generating module to the path calculating unit;
  • a path information receiving module configured to receive path information of the subscription service requested by the subscription service request message sent by the path calculation unit, where path information of the subscription service requested by the subscription service request message is determined by the path calculation unit.
  • a path calculation unit comprising:
  • a request message receiving module configured to receive a subscription service request message, where the request message includes a time attribute parameter
  • a path calculation module configured to calculate a path of the subscription service requested by the subscription service request message according to the time attribute parameter and the traffic engineering data information in the subscription service request message and the existing subscription service connection information;
  • the path information sending module is configured to send the path information of the subscription service calculated by the path calculation module to the path calculation client.
  • a path calculation unit that specifically calculates a subscription service path is set, and the path calculation unit stores traffic engineering data information and a subscription service connection, without changing existing signaling and routing.
  • Information the path calculation client-generated subscription service request message is provided with a time attribute parameter for establishing a subscription service, and the path calculation unit calculates a path for the subscription service according to the time attribute parameter and the traffic engineering data information and the subscription service connection information, without adding signaling and The burden and complexity of routing enable fast and convenient provisioning of subscription services.
  • FIG. 1 is a flowchart of a method according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a format of a time attribute parameter SERVICE-TIME according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of establishing a service process according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a system for booking a path according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram of a path calculation client according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a path calculation unit according to an embodiment of the present invention. detailed description
  • the embodiment of the invention provides a method for subscribing a route for quickly and conveniently opening a subscription service.
  • an embodiment of the present invention provides a functional entity (Path Computation Element, PCE) that is specifically responsible for path computation.
  • the PCE provided by the embodiment of the present invention stores two kinds of data information, and the other is a traffic engineering database.
  • the traffic engineering database stores topology information and link resource information of the entire network; the other is a subscription service connection information base, and the subscription service connection information base stores the connection of the subscription service Identification, as well as the turn-on time, duration, and link resource usage of these connections.
  • the traffic engineering data and the subscription service connection information are stored in the form of a database on the PCE, and the embodiment of the present invention is not limited to the form of the database. Other forms of data such as the form of the data table also support the present invention. Example.
  • a node that needs to calculate a path in the embodiment of the present invention is called a Path Computation Client (PCC).
  • the path calculation client sends a request message including path calculation parameter information to the path calculation unit, and the path calculation unit calculates the client's request and the traffic engineering database and the subscription service according to the path based on the known network topology and constraints.
  • the connection repository calculates an optimal path that satisfies the constraints.
  • a special path calculation protocol (PCEP) is set between the path calculation client PCC and the path calculation unit PCE and between the PCE and the PCE for communication.
  • PCEP path calculation protocol
  • the subscription service requesting node PCC establishes the service and tears down the service through the service first node.
  • the service head node receives a subscription service request of another node, and then the service head node sends a subscription service path calculation to the PCE. begging.
  • the service head node sends a path calculation request to the PCE, for the PCE, the service head node is the path calculation client PCC of the PCE.
  • the selection of the service head node is determined according to the actual business needs.
  • the service first node carries the basic attribute parameter such as the bandwidth requirement of the subscription service in addition to the basic parameter of the bandwidth requirement of the subscription service, and additionally carries the opening time and duration of the subscription service.
  • Time equal time attribute parameter.
  • the PCE can determine the path that needs to calculate the subscription service, and the PCE selects some time periods in the information base according to the time attribute parameter and the TEDB stored by itself.
  • the occupied resources are divided into the topology resources used in the duration of the service (the time period between the opening time and the duration), and the path of the subscription service is calculated based on the divided topology resources, and the subscription service path is calculated.
  • the service head node After that, it returns to the first node of the service, and records the detailed information of the subscription service in the subscription service connection information base. After receiving the path calculation result returned by the PCE, the service head node saves the path information in the node.
  • the service head node sends a signaling message to the corresponding node on the path to activate the service path and start the service.
  • the service first node sends a teardown path signaling message to the corresponding node on the path to tear down the service path. If the teardown is successful, the service head node sends a notification message of successful removal to the PCE, and the PCE receives the notification. After the message, the data information of this service is deleted from the subscription service connection information base.
  • the service head node does not carry the time attribute in the path calculation request sent to the PCE, and the PCE receives the path calculation request after receiving the path calculation request.
  • the PCE divides the subscription service connection information base according to the TEDB, and the PCE calculates the path based on the divided resource topology and returns it to the service head node.
  • the service head node After receiving the path calculation result returned by the PCE, the service head node initiates a signaling message to establish the service path and activate the service.
  • FIG. 1 is a flowchart of a method for subscribing a path according to an embodiment of the present invention.
  • the method provided by the embodiment of the present invention specifically includes the following steps:
  • Step 101 The path calculation unit receives a subscription service request message, where the subscription service request message includes a time attribute parameter.
  • Step 102 The path calculation unit calculates a path of the subscription service according to the time attribute parameter and the traffic engineering database and the subscription service connection information base, and then sends the path information of the subscription service to the path calculation client.
  • the path calculation unit divides the topology resource used for the time required for the subscription service according to the traffic engineering data information and the resource in the subscription service connection information, and calculates the subscription service based on the divided topology resource and the time attribute parameter. path of.
  • the method further includes: the path calculation unit storing connection information of the subscription service, where the connection information of the predetermined service includes path information and time attribute parameters of the predetermined service, and the time attribute parameter may include the start of the service. Information such as time and duration of the business.
  • the path calculation unit stores the path information of the subscription service in the subscription service connection information base.
  • the path calculation unit stores the path information of the subscription service
  • the path calculation unit further includes:
  • the path calculation unit After receiving the notification message of the successful demolition of the subscription service path sent by the path calculation client, the path calculation unit deletes the path information of the subscription service.
  • the path calculation unit deletes the path information of the subscription service in the subscription service connection information base.
  • an embodiment of the present invention further discloses a method for subscribing to a path.
  • FIG. 2 is a flowchart of a method for subscribing to a path according to an embodiment of the present invention.
  • the method provided by the embodiment of the present invention specifically includes the following steps:
  • Step 201 The path calculation client generates a subscription service request message, where the subscription service request message includes a time attribute parameter, and then sends the subscription service request message to the path calculation unit.
  • Step 202 The path calculation client receives the path information of the subscription service returned by the path calculation unit, and the path information of the subscription service is obtained by the path calculation unit according to the time attribute parameter, the traffic engineering data information, and the subscription service connection information.
  • the method further includes:
  • the path calculation client sends a message to the node on the subscription service path to activate the subscription service path and activate the subscription service.
  • the message is sent to the node on the subscription service path to tear down the subscription service path. If the subscription service path is successfully removed, a notification message for successfully deleting the subscription service path is sent to the path calculation unit.
  • the path calculation client sets the arrival time of the subscription service.
  • the path calculation client sends a message to the node on the subscription service path to tear down the subscription service path.
  • a notification message for subscribing to the success of the service path is given to the path calculation unit.
  • the time attribute parameter SERVICE-TIME is additionally set in the subscription service request message (PCReq) generated by the PCC according to the PCEP protocol, and SERVICE-TIME is used.
  • SERVICE-TIME may also indicate other time attribute parameters, and is not limited to the case provided by the embodiment of the present invention. If SERVICE-TIME exists in the path calculation request PCReq message, it indicates that the path for the subscription service needs to be calculated. If there is no SERVICE-TIME in the path calculation request PCReq message, it means that the path of the normal service (that is, the path that is not the subscription service) is calculated.
  • PCReq message format of the PCEP protocol is as follows:
  • a time attribute parameter SERVICE-TIME is set to indicate the opening time and duration of the subscription service.
  • FIG. 3 is a schematic diagram of a format of a time attribute parameter SERVICE-TIME according to an embodiment of the present invention. among them,
  • Month 4 digits, indicating the month in which the opening time is located
  • Points 8 digits, indicating the minute of the opening time
  • Seconds 8 digits, indicating the second of the opening time
  • Milliseconds 11 bits, indicating the millisecond of the turn-on time
  • Duration 32 digits, indicating the number of days the business continues;
  • Duration 5 digits, indicating the number of hours the business continues;
  • Duration 8 digits, indicating the number of minutes the business continues
  • Duration 8 bits, indicating the number of seconds the business continues
  • Reserved bits 8 bits, reserved. Or, the number of days in progress: 32 digits, indicating the number of days the business continues; Duration: 5 digits, indicating the number of hours of business duration other than the number of days of duration; Duration: 8 digits, indicating the duration of the business, except for the number of days and duration Minutes; Duration: 8 digits, representing the number of seconds of business duration except for duration, duration, and duration; duration milliseconds: 11 digits, indicating business duration except duration, duration, duration The number of milliseconds other than the number and duration seconds.
  • SERVICE-TIME format can be extended according to the time precision and service requirements of the actual device. If the service requirement and the device precision only need the second level, it is not necessary to calculate the time based on the millisecond.
  • node A is selected as the service first node, and node A needs to establish two services, one is a common service (recorded as LSP1, the bandwidth is virtual container VC4), and the other is a subscription service (recorded as LSP2, bandwidth).
  • LSP1 the bandwidth
  • LSP2 the subscription service
  • the opening time is 2010-10-10 08:30:00
  • the duration is 30 days as an example.
  • Node I needs to establish a subscription service (denoted as LSP3, with bandwidth of VC4, with an open time of 2010-11-10 08:30:00 and a duration of 10 days).
  • the service establishment process is as follows:
  • Step 401 The node A first establishes a common service LSP1, and the node A initiates a path calculation request message PCReq to the PCE of the network, where the path calculation request message PCReq carries a basic attribute such as bandwidth, and does not carry SERVICE-TIME;
  • Step 402 The PCE calculates a path based on the TEDB stored by itself, and assumes that the link information that the path passes is A-B-C-D-E, and returns the calculated path information to the node A;
  • Step 403 After receiving the connection path information of the LSP1, the node A initiates a signaling message to establish a corresponding connection, that is, the normal service LSP1 is activated;
  • Step 404 Node A then establishes a subscription service LSP2, and node A initiates a path calculation request message PCReq to the PCE of the network.
  • the path calculation request message PCReq carries basic attributes such as bandwidth, and additionally carries a time attribute parameter SERVICE-TIME.
  • the parameter indicates that the service opening time is 2010-10-10 08:30:00, and the duration is 30 days;
  • Step 405 After receiving the path calculation request, the PCE determines that the path of the subscription service needs to be calculated, and calculates a path of the subscription service based on the TEDB database and the subscription service connection information database stored by the PCE, and assumes that the link information that the path passes is AFHGE;
  • the PCE only needs to calculate the path of the subscription service according to the TEDB.
  • Step 406 The PCE returns the calculated subscription service path information to the node A, and saves the path information of the subscription service in the subscription service connection information base.
  • the subscription business connection information base is as shown in Table 1:
  • Step 407 After receiving the returned subscription service path information, the node A saves the local node.
  • the path calculation request message PCReq carries a basic attribute such as bandwidth, and additionally carries a time attribute parameter SERVICE-TIME, which indicates that the service opening time is 2010-11- 10 08:30:00, and the duration is 10 days;
  • Step 409 After receiving the path calculation request, the PCE determines that the path of the subscription service needs to be calculated, and then divides the TEDB database and the subscription service connection information base based on the stored information in 2010-10-10 08:30:00 to 2010- 11-20 08:30:00 has a topology of available resources. Based on the sub-topology information, the PCE can calculate the corresponding path. It is assumed that the calculated path information is IFHGJ. It can be seen that LSP2 and LSP3 are shared in the FHG link when performing subscription service based on different time, thereby improving Resource utilization.
  • Step 410 The PCE returns the calculated path information to the node I, and saves the path information of the subscription service in the subscription service connection information base.
  • the current subscription business connection information database is shown in Table 2:
  • Step 411 Assuming that the LSP2 is set to open at the time of 2010-10-10 08:30:00, the node A initiates signaling to establish such a service path, and activates the service;
  • Step 412 Assume that when the duration of the LSP2 arrives (ie, lasts for 30 days), the node A sends the teardown path signaling message to the corresponding node on the path (in this embodiment, ?, H, G, E) to tear down the LSP2 service. Path, if the removal is successful, node A notifies the PCE of the removal information;
  • Step 413 After receiving the notification message that the LSP2 has been removed, the PCE deletes the record information of the LSP2 in the subscription service connection information base.
  • Step 414 Assume that when the LSP3 is set to open time 2010-11-10 08:30:00, node I sends a message to establish such a service path and activate the service;
  • Step 415 It is assumed that when the duration of the LSP3 arrives (that is, for 10 days), the node I sends the teardown path signaling message to the corresponding node on the path (in this embodiment, ?, H, G, J) to tear down the LSP3 service. Path, if the removal is successful, node I notifies the PCE of the removal information;
  • Step 416 After receiving the notification message that the LSP3 has been removed, the PCE deletes the record information of the LSP3 in the subscription service connection information base.
  • an embodiment of the present invention discloses a system for subscribing to a path.
  • a system for subscribing to a path includes:
  • a path calculation client 501 configured to generate a subscription service request message, where the subscription service request message includes a time attribute parameter, and the subscription service request message is sent to the path calculation unit;
  • the path calculation unit 502 is configured to receive a subscription service request message sent by the path calculation client, and perform calculation of the reservation path according to the time attribute parameter and the traffic engineering database and the subscription service connection information base, and then send the path information of the subscription service to the path calculation. client.
  • the path calculation unit 502 saves two types of database information, one is a traffic engineering database TEDB, and the traffic engineering database stores topology information and link resources of the entire network.
  • the other is a subscription service connection information base, which stores the connection identifiers of the subscription services, and the opening time and duration of the connections, and the link resource conditions occupied by the connections.
  • an embodiment of the present invention also discloses a path calculation client.
  • a path calculation client including:
  • a request message generating module 601, configured to generate a subscription service request message, where the subscription service request The message includes a time attribute parameter;
  • the request message generating module 601 generates a subscription service request message according to the PCEP, where the subscription service request message includes a time attribute parameter;
  • the request message sending module 602 is configured to send the subscription service request message generated by the request message generating module 601 to the path calculating unit;
  • the path information receiving module 603 is configured to receive path information of the subscription service sent by the path calculation unit, where the path information of the subscription service is calculated by the path calculation unit according to the time attribute parameter and the traffic engineering data information and the subscription service connection information.
  • the path information receiving module 603 and the request message sending module 602 perform relatively independent functions, and the path information of the subscription service fed back by the path calculating unit causes the functions of the two modules to have an execution sequence, and the dotted line in the figure indicates The two modules are logically connected by a path calculation unit.
  • an embodiment of the present invention further discloses a path calculation unit.
  • a path calculation unit includes:
  • the request message receiving module 701 is configured to receive a subscription service request message, where the request message includes a time attribute parameter;
  • the path calculation module 702 is configured to calculate a path of the subscription service according to the time attribute parameter and the traffic engineering database and the subscription service connection information base in the subscription service request message.
  • the path information sending module 703 is configured to send the path information of the subscription service calculated by the path calculation module 702 to the path calculation client.
  • the path calculation unit further includes:
  • the storage module 704 is configured to store a traffic engineering database and a subscription service connection information base.
  • the path calculation unit further includes:
  • the maintenance module 705 is configured to store and delete path information of the subscription service. Specifically, the connection information of the subscription service is stored in the storage module 704, and/or the connection information of the subscription service is deleted from the storage module 704, and the connection information of the predetermined service includes: path information of the predetermined service and time attribute parameters.
  • the maintenance module 705 stores and deletes the path information of the subscription service in the subscription service connection information base.
  • a path calculation unit that specifically calculates a subscription service path is set, without adding burden and complexity of existing signaling and routing, where the path calculation unit saves There is traffic engineering data information and subscription service connection information, and a path attribute parameter for establishing a subscription service is set in the reservation service request message generated by the path calculation client, and the path calculation unit calculates the reservation according to the time attribute parameter, the traffic engineering data information, and the subscription service connection information.
  • the path of the service does not increase the burden and complexity of signaling and routing, and achieves the purpose of quickly and conveniently opening the subscription service.
  • the path calculation unit after the path calculation unit sends the path information of the subscription service to the path calculation client, the path calculation unit further records the path of the subscription service in the subscription service connection information base.
  • Information which provides conditions for a fast and convenient booking business.
  • the path calculation unit further receives the teardown subscription service path success notification message, and deletes the path information of the subscription service from the subscription service connection information base, thereby improving Resource utilization.

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Description

预订路径的方法、 系统及路径计算客户、 路径计算单元 本申请要求于 2008 年 7 月 25 日提交中国专利局、 申请号为 200810134754.0、 发明名称为 "预订路径的方法、 系统及路径计算客户、 路径 计算单元" 的中国专利申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信技术领域,具体涉及一种预订路径的方法、 系统及路径计 算客户、 路径计算单元。
背景技术
随着数据通信网络技术的不断发展, 以及客户业务需求的不断多样化, 已 经出现各种丰富的业务类型, 如在线视频、 视频会议、 在线三维游戏、 视频下 载以及各种专线业务; 专线业务包括: 一层虚拟专用网 (LI Virtue Private Network, LI VPN ) 、 二层虚拟专用网 ( L2 Virtue Private Network, L2VPN ) 等。 每个客户对服务的质量要求不同, 有的客户要求即时需要即时开通 ( Bandwidth on Demand, BOD ) , 这种 BOD业务对时间要求很敏感, 需要运 营商能够及时灵活地进行业务调度管理; 有的客户希望能够提前预订某种业 务, 在到达某个时间点的时候即时开通该种业务。
目前, 基于通用多协议标记交换 ( Generalized Multiprotocol Label Switching , GMPLS ) 控制平面的自动交换光网络( Automatically Switched Optical Network, ASON ) 中提供预订业务服务的方法主要是通过扩展信令协 议, 即基于流量工程扩展的资源预留协议 ( Resource Reservation Protocol - Traffic Extension, RSVP-TE )的方式来实现预订业务的建立。 该方案通过扩展 RSVP-TE信令, 路径上的节点发起信令建立连接的时候, 节点根据 RSVP-TE 生成的路径 /预留 (Path/Reserve ) 消息中携带时间约束信息, 每个节点接收到 Path/Reserve消息后预留相应的资源 , 同时每个节点在 Path/Reserve消息中传递 相应的时间约束信息来实现预订业务的建立。
在对该方案的研究和实践过程中,发明人发现现有技术存在以下问题: 现 有技术中的路径状态块( Path State Block, PSB )和预留状态块( Reserve State Block, RSB )都需要刷新与资源无关的时间信息, 增加了信令负担, 不能实 现快速、 方便地开通预订业务。 同时,现有技术没有明确相应的路由方案, 即如何实现预订业务的路由计 算, 一种是通过网管人为指定相应的资源,这样就无法体现控制平面自动化的 优势; 另一种可能是通过扩展路由协议, 在路由协议中发布流量工程(Traffic Engineering , TE )链路的时间特性, 这样会极大地增大了路由的复杂度, 不 能实现快速、 方便地开通预订业务。
发明内容
有鉴于此,本发明实施例提供了一种预订路径的方法、 系统及路径计算客 户、 路径计算单元, 实现快速、 方便地开通预订业务。
为实现上述目的, 本发明实施例提供了如下技术方案:
一种预订路径的方法, 包括:
接收预订业务请求消息, 所述预订业务请求消息中包括时间属性参数; 根据所述时间属性参数和流量工程数据信息以及已有的预订业务连接信 息计算所述预订业务请求消息所请求的预订业务的路径,将计算出的预订业务 的路径信息发送给路径计算客户。
一种预订路径的方法, 包括:
生成预订业务请求消息, 所述预订业务请求消息中包括时间属性参数,将 所述预订业务请求消息发送给路径计算单元;
接收路径计算单元返回的预订业务的路径信息,所述预订业务的路径信息 由路径计算单元根据时间属性参数和流量工程数据信息以及已有的预订业务 连接信息计算获得。
一种预订路径的系统, 包括:
路径计算客户, 用于生成预订业务请求消息, 所述预订业务请求消息中包 括时间属性参数, 并将所述预订业务请求消息发送路径计算单元;
路径计算单元, 用于接收路径计算客户发送的预订业务请求消息, 并根据 所述时间属性参数和流量工程数据信息以及已有的预订业务连接信息计算所 述预订业务请求消息所请求的预订业务的路径,将计算得到的预订业务的路径 信息发送给路径计算客户。
一种路径计算客户, 包括:
请求消息生成模块, 用于生成预订业务请求消息, 所述预订业务请求消息 中包括时间属性参数;
请求消息发送模块,用于将所述请求消息生成模块生成的预订业务请求消 息发送给路径计算单元;
路径信息接收模块,用于接收所述路径计算单元发送的所述预订业务请求 消息所请求的预订业务的路径信息,所述预订业务请求消息所请求的预订业务 的路径信息由路径计算单元根据所述时间属性参数和流量工程数据信息以及 已有的预订业务连接信息计算获得。
一种路径计算单元, 包括:
请求消息接收模块, 用于接收预订业务请求消息, 所述请求消息中包括时 间属性参数;
路径计算模块,用于根据预订业务请求消息中的时间属性参数和流量工程 数据信息以及已有的预订业务连接信息,计算所述预订业务请求消息所请求的 预订业务的路径;
路径信息发送模块,用于将路径计算模块计算出的预订业务的路径信息发 送给路径计算客户。
可见,本发明实施例提供的技术方案,在不改变现有信令和路由的情况下, 设置专门计算预订业务路径的路径计算单元,所述路径计算单元保存有流量工 程数据信息和预订业务连接信息,路径计算客户生成的预订业务请求消息中设 置有建立预订业务的时间属性参数,路径计算单元根据时间属性参数和流量工 程数据信息以及预订业务连接信息计算预订业务的路径,没有增加信令和路由 的负担和复杂度, 实现了快速、 方便地开通预订业务。
附图说明
图 1为本发明实施例提供的一种方法流程图;
图 2为本发明实施例提供的另一种方法流程图;
图 3为本发明实施例时间属性参数 SERVICE-TIME的格式示意图; 图 4为本发明实施例提供的一种建立业务过程示意图;
图 5为本发明实施例提供的一种预订路径的系统结构示意图;
图 6为本发明实施例提供的一种路径计算客户结构示意图;
图 Ί为本发明实施例提供的一种路径计算单元结构示意图。 具体实施方式
本发明实施例提供了一种预订路径的方法, 用于快速、方便地开通预订业 务。
在基于通用多协议标记交换 ( Generalized Multi-Protocol Label Switching, GMPLS )控制平面的自动交换光网络( Automatically Switched Optcial Network, ASON ) 中, 发起信令建立一条标签交换路径 ( Label Switched Path, LSP )之 前, 需要先通过某种机制获取到这条 LSP的完整路径。 为实现上述目的, 本发 明实施例提供了一种专门负责路径计算的功能实体, 路径计算单元 (Path Computation Element , PCE )。
本发明实施例提供的 PCE保存有两种数据信息, 一种是流量工程数据库
( Traffic Engineering DataBase , TEDB ) , 所述流量工程数据库保存了整个网 络的拓朴信息和链路资源信息; 另一种是预订业务连接信息库, 所述预订业务 连接信息库保存了预订业务的连接标识,以及这些连接的开通时间、持续时间, 以及这些连接所占用的链路资源情况等信息。本发明实施例中将流量工程数据 和预订业务连接信息以数据库的形式保存在 PCE上,并不代表本发明实施例局 限于数据库的形式,其它形式的数据形式比如数据表的形式同样支持本发明实 施例。
本发明实施例中需要计算路径的节点称为路径计算客户 ( Path Computation Client, PCC )。 所述路径计算客户发送一个包括路径计算参数信 息的请求消息给路径计算单元,所述路径计算单元基于已知的网络拓朴结构和 约束条件,根据路径计算客户的请求以及流量工程数据库和预订业务连接信息 库计算出一条满足约束条件的最佳路径。
在本发明实施例中, 所述路径计算客户 PCC和路径计算单元 PCE之间以及 PCE与 PCE之间设置有专门的路径计算协议(PCE Communication Protocol, PCEP )进行通信。
下面对上述构思作进一步详细说明。
本发明实施例提供的基于 GMPLS控制平面的 ASON中,预订业务请求节点 PCC建立业务和拆除业务是通过业务首节点来完成的。所述业务首节点接收其 它节点的预订业务请求 , 然后所述业务首节点向 PCE发送预订业务路径计算请 求。 当所述业务首节点向 PCE发送路径计算请求时, 对 PCE来说, 所述业务首 节点就是 PCE的路径计算客户 PCC。 所述业务首节点的选取根据实际业务本身 需要而定。
如果路径计算客户 PCC建立的是预订业务, 业务首节点在发送给 PCE的 路径计算请求中除了携带该预订业务的带宽要求等基本属性参数之外, 还额 外携带有该预订业务的开通时间、 持续时间等时间属性参数。 PCE在接收到 这种具有时间属性参数的路径计算请求消息时, 则可以判断出需要计算预订 业务的路径, PCE则根据时间属性参数和自身存储的 TEDB以及预订业务连 接信息库中某些时间段所占用的资源, 划分出该业务持续时间段(开通时间 和持续时间之间的时间段) 中使用的拓朴资源, 基于划分后的拓朴资源来计 算预订业务的路径, 计算完预订业务路径后返回给业务首节点, 并在预订业 务连接信息库中记录下该条预订业务的详细信息。 业务首节点接收到 PCE返 回的路径计算结果后, 把该条路径信息保存在本节点。 当预订业务的开通时 间到达时 , 业务首节点发送信令消息给路径上的相应节点激活这条业务路 径, 开通业务。 如果预订业务的持续时间到达时, 业务首节点发送拆除路径 信令消息给路径上的相应节点拆除这条业务路径, 如果拆除成功, 业务首节 点发送拆除成功的通知消息给 PCE, PCE接收到通知消息后, 从预订业务连 接信息库中删除这条业务的数据信息。
如果路径计算客户 PCC建立的是普通业务(即时请求即时开通, 而不是预 订业务) , 则业务首节点在发送给 PCE的路径计算请求中不会携带时间属性, PCE接收到这种路径计算请求后, PCE根据 TEDB, 从中划分预订业务连接信 息库, PCE基于划分后的资源拓朴计算路径并返回给业务首节点。 业务首节点 接收到 PCE返回的路径计算结果后, 发起信令消息建立这条业务路径, 开通业 务。
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清 楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是 全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造 性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。
基于上述构思 , 本发明实施例公开了一种预订路径的方法。 请参阅图 1所示, 图 1为本发明实施例提供的一种预订路径的方法流程图。 本发明实施例提供的方法具体包括以下步骤:
步骤 101 : 路径计算单元接收预订业务请求消息, 所述预订业务请求消息 中包括时间属性参数;
步骤 102: 路径计算单元根据时间属性参数和流量工程数据库以及预订业 务连接信息库计算预订业务的路径,然后将预订业务的路径信息发送给路径计 算客户。
在本发明实施例中 ,路径计算单元根据流量工程数据信息和预订业务连接 信息中的资源划分出预订业务所需时间使用的拓朴资源,基于划分出的拓朴资 源和时间属性参数计算预订业务的路径。
需要说明的是, 所述步骤 102之后还进一步包括: 路径计算单元存储预订 业务的连接信息,该预定业务的连接信息包括预定业务的路径信息和时间属性 参数, 其时间属性参数可包括业务的开始时间和业务的持续时间等信息。
本发明实施例中 ,路径计算单元在预订业务连接信息库中存储预订业务的 路径信息。
需要说明的是, 所述路径计算单元存储预订业务的路径信息之后,还进一 步包括:
路径计算单元接收到路径计算客户发送的拆除预订业务路径成功的通知 消息后, 删除预订业务的路径信息。
本发明实施例中,路径计算单元在预订业务连接信息库中删除预订业务的 路径信息。
通过上述预订路径的方法, 实现了快速、 方便地开通预订业务。
基于上述构思, 本发明实施例还公开了一种预订路径的方法。
请参阅图 2所示, 图 2为本发明实施例提供的一种预订路径的方法流程图 , 本发明实施例提供的方法具体包括以下步骤:
步骤 201 : 路径计算客户生成预订业务请求消息, 所述预订业务请求消息 中包括时间属性参数, 然后将预订业务请求消息发送给路径计算单元;
需要说明的是,所述预订业务请求消息是路径计算客户根据路径计算协议 PCEP生成的。 步骤 202: 路径计算客户接收路径计算单元返回的预订业务的路径信息 , 所述预订业务的路径信息由路径计算单元根据时间属性参数和流量工程数据 信息以及预订业务连接信息计算获得。
需要说明的是, 步骤 202中所述路径计算客户接收路径计算单元返回的预 订业务的路径信息之后, 进一步包括:
路径计算客户发送消息给预订业务路径上的节点激活预订业务路径,开通 预订业务。
进一步,发送消息给预订业务路径上的节点拆除预订业务路径,如果拆除 预订业务路径成功, 则发送拆除预订业务路径成功的通知消息给路径计算单 元。
本发明实施例中,路径计算客户设置预订业务到达时间, 当预订业务到达 时间达到时,路径计算客户发送消息给预订业务路径上的节点拆除预订业务路 径,如果拆除预订业务路径成功, 则发送拆除预订业务路径成功的通知消息给 路径计算单元。
通过上述预订路径的方法, 实现了快速、 方便地开通预订业务。
下面对具体实现本发明实施例的方法作进一步说明。
本发明实施例在不增加现有信令和路由的负担和复杂度的情况下 ,在 PCC 根据 PCEP协议生成的预订业务请求消息 (PCReq ) 中额外设置时间属性参数 SERVICE-TIME, SERVICE-TIME用来表示预订业务的开通时间和持续时间 , 当然 SERVICE-TIME也可以表示其它时间属性参数,并不局限于本发明实施例 提供的情况。 如果在路径计算请求 PCReq消息中存在 SERVICE-TIME, 则表示 是需要计算预订业务的路径。 如果路径计算请求 PCReq消息中没有 SERVICE-TIME, 则表示计算普通业务的路径(即不是预订业务的路径) 。
PCEP协议的 PCReq消息格式如下:
<PCReq Message>: :=<Common Header>
[<SVEC-list>]
<request-list>
Where:
[<svec-list>]::= <SVEC> [<svec-list>] <request-list>::=<request>[<request-list>]
<request >::=<RP>
<END-POINTS>
[<LSPA>]
[<BANDWIDTH>] /带宽 /
[<SERVICE-TIME>] /时间参数 /
[<metric-list>]
[<RRO>[<BANDWIDTH>]]
[<IRO>]
[<LOAD-BALANCING>]
WHERE:
<metric-list>::=<METRIC>[<metric-list>]
可见, 在上述代码中, 设置有时间属性参数 SERVICE-TIME, 用于表示预 订业务的开通时间和持续时间。
请参阅图 3所示,图 3为本发明实施例时间属性参数 SERVICE-TIME的格式 示意图。 其中,
年: 14位, 表示开通时间所在年份;
月: 4位, 表示开通时间所在月份;
日: 5位, 表示开通时间所在日期;
小时: 5位, 表示开通时间所在小时;
分: 8位, 表示开通时间所在分钟;
秒: 8位, 表示开通时间所在秒;
毫秒: 11位, 表示开通时间所在毫秒;
持续天数: 32位, 表示业务持续的天数;
持续小时: 5位, 表示业务持续的小时数;
持续分钟: 8位, 表示业务持续的分钟数;
持续秒: 8位, 表示业务持续的秒数;
持续毫秒: 11位, 表示业务持续的毫秒数;
预留位: 8位, 预留位。 或者, 持续天数: 32位, 表示业务持续的天数; 持续小时: 5位, 表示业 务持续时间除了持续天数以外的小时数; 持续分钟: 8位, 表示业务持续时间 除了持续天数和持续小时数以外的分钟数; 持续秒: 8位, 表示业务持续时间 除了持续天数、 持续小时数和持续分钟数以外的秒数; 持续毫秒: 11位, 表示 业务持续时间除了持续天数、持续小时数、持续分钟数和持续秒数以外的毫秒 数。
假定业务持续 8天 2小时 30分 40秒, 则持续天数: 8天, 持续小时: 2小时, 持续分钟: 30分钟; 持续秒: 40秒。
需要说明的是,上述 SERVICE-TIME的格式可以根据实际设备的时间精度 和业务要求来扩展,如果业务要求和设备精度只需要秒级, 则不需要基于毫秒 来计算时间。
为了使本发明的目的、技术方案和优点更加清楚明白, 下面参照附图并以 具体的实施例对本发明作进一步详细说明。
请参阅图 4所示, 选取节点 A为业务首节点, 节点 A需要建立两种业务, 一 条为普通业务(记为 LSP1 , 带宽为虚拟容器 VC4 ) , 另一条为预订业务(记为 LSP2,带宽为 VC4,以开通时间为 2010-10-10 08:30:00,持续时间为 30天为例)。 节点 I需要建立一条预订业务(记为 LSP3 ,带宽为 VC4,以开通时间为 2010-11-10 08:30:00, 持续时间为 10天为例) , 业务建立过程如下:
步骤 401 : 所述节点 A先建立普通业务 LSP1 , 节点 A向本网络的 PCE发起路 径计算请求消息 PCReq, 所述路径计算请求消息 PCReq中携带带宽等基本属 性, 不携带 SERVICE-TIME;
步骤 402: 所述 PCE基于自身存储的 TEDB计算路径, 假设路径经过的链路 信息为 A-B-C-D-E, 并将计算出的路径信息返回给节点 A;
步骤 403: 节点 A接收到 LSP1的连接路径信息后, 发起信令消息建立相应 的连接, 即开通普通业务 LSP1;
步骤 404: 节点 A接着建立预订业务 LSP2, 节点 A向本网络的 PCE发起路径 计算请求消息 PCReq, 所述路径计算请求消息 PCReq中携带带宽等基本属性, 还额外携带时间属性参数 SERVICE-TIME , 该参数指示业务的开通时间为 2010-10-10 08:30:00, 持续时间为 30天; 步骤 405: PCE接收到该路径计算请求后, 判断是需要计算预订业务的路 径, 则基于自身存储的 TEDB数据库和预订业务连接信息库计算预订业务的路 径, 假设路径经过的链路信息为 A-F-H-G-E;
需要说明的是, 如果预订业务连接信息库还没有预订业务信息, 即为空, 则 PCE只需要根据 TEDB计算预订业务的路径。
步骤 406: PCE把计算好的预订业务路径信息返回给节点 A, 并在预订业务 连接信息库中保存该条预订业务的路径信息。 假设预订业务连接信息库如表 1 所示:
Figure imgf000012_0001
Figure imgf000012_0003
步骤 407: 节点 A接收到返回的预订业务路径信息后, 保存在本节点; 步骤 408: 节点 I建立预订业务 LSP3 , 此时节点 I为业务首节点, 所以, 节 点 I向本网络的 PCE发起路径计算请求 PCReq,所述路径计算请求消息 PCReq中 携带带宽等基本属性, 还额外携带时间属性参数 SERVICE-TIME, 该参数指示 业务的开通时间为 2010- 11 - 10 08:30:00 , 持续时间为 10天;
步骤 409: PCE接收到该路径计算请求后, 判断是需要计算预订业务的路 径, 则基于自身存储的 TEDB数据库和预订业务连接信息库划分出在 2010-10-10 08:30:00至 2010-11-20 08:30:00具有可用资源的拓朴。 PCE基于这个 子拓朴信息可以计算出相应的路径, 假设计算出来的路径信息为 I-F-H-G-J; 可以看出 LSP2和 LSP3在 F-H-G这段链路在进行基于不同时间的预订业务 时实现了分享, 从而提高了资源利用率。
步骤 410: PCE把计算好的路径信息返回给节点 I, 并在预订业务连接信息 库中保存该条预订业务的路径信息。 现在的预订业务连接信息库如表 2所示:
Figure imgf000012_0002
业务连接标识 占用的带宽信息 开通时间 持续时间
LSP2 A-F-H-G-E ( VC4 ) 2010-10-10 08:30:00 30天
LSP3 I-F-H-G-J ( VC4 ) 2010-11-10 08:30:00 10天 步骤 411 : 假设到达 LSP2的开通时间 2010-10-10 08:30:00的时候, 节点 A发 起信令建立这种业务路径, 并开通业务;
步骤 412: 假设当 LSP2的持续时间到达时 (即持续了 30天) , 节点 A发送 拆除路径信令消息给路径上的相应节点(本实施例中为?、 H、 G、 E )拆除 LSP2 业务路径, 如果拆除成功, 节点 A并把拆除信息通知 PCE;
步骤 413: PCE接收到 LSP2已拆除的通知消息后, 在预订业务连接信息库 中删除 LSP2的记录信息;
步骤 414: 假设到达 LSP3的开通时间 2010-11-10 08:30:00的时候, 节点 I发 起消息建立这种业务路径, 并开通业务;
步骤 415: 假设当 LSP3的持续时间到达时(即持续了 10天) , 节点 I发送拆 除路径信令消息给路径上的相应节点 (本实施例中为?、 H、 G、 J )拆除 LSP3 业务路径, 如果拆除成功, 节点 I并把拆除信息通知 PCE;
步骤 416: PCE接收到 LSP3已拆除的通知消息后, 在预订业务连接信息库 中删除 LSP3的记录信息。
基于上述方法, 本发明实施例公开了一种预订路径的系统。
请参阅图 5所示, 一种预订路径的系统, 包括:
路径计算客户 501 , 用于生成预订业务请求消息, 所述预订业务请求消息 中包括时间属性参数, 并将预订业务请求消息发送路径计算单元;
路径计算单元 502, 用于接收路径计算客户发送的预订业务请求消息, 并 根据时间属性参数和流量工程数据库以及预订业务连接信息库进行预订路径 的计算, 然后将预订业务的路径信息发送给路径计算客户。
需要说明的是, 在本发明实施例提供的路径计算单元 502中自身保存有两 种数据库信息, 一种是流量工程数据库 TEDB, 所述流量工程数据库保存了整 个网络的拓朴信息和链路资源信息; 另一种是预订业务连接信息库, 所述预订 业务连接信息库保存了预订业务的连接标识 , 以及这些连接的开通时间、持续 时间 , 以及这些连接所占用的链路资源情况等信息。
同时, 本发明实施例还公开了一种路径计算客户。
请参阅图 6所示, 一种路径计算客户, 包括:
请求消息生成模块 601 , 用于生成预订业务请求消息, 所述预订业务请求 消息中包括时间属性参数;
需要说明的是, 请求消息生成模块 601根据 PCEP生成预订业务请求消息 , 所述预订业务请求消息包括时间属性参数;
请求消息发送模块 602,用于将请求消息生成模块 601生成的预订业务请求 消息发送给路径计算单元;
路径信息接收模块 603 , 用于接收路径计算单元发送的预订业务的路径信 息,所述预订业务的路径信息由路径计算单元根据时间属性参数和流量工程数 据信息以及预订业务连接信息计算获得。
其中, 路径信息接收模块 603与请求消息发送模块 602执行相对独立的功 能,路径计算单元反馈的预订业务的路径信息使这两个模块的功能有执行上的 先后顺序, 图示中的虚线表示这两个模块通过路径计算单元逻辑连接。
同时, 本发明实施例还公开了一种路径计算单元。
请参阅图 7所示, 一种路径计算单元, 包括:
请求消息接收模块 701 , 用于接收预订业务请求消息, 所述请求消息中包 括时间属性参数;
路径计算模块 702, 用于根据预订业务请求消息中的时间属性参数和流量 工程数据库以及预订业务连接信息库, 进行预订业务的路径的计算;
路径信息发送模块 703 , 用于将路径计算模块 702计算出的预订业务的路 径信息发送给路径计算客户。
需要说明的是, 所述路径计算单元还包括:
存储模块 704, 用于储存流量工程数据库和预订业务连接信息库。
需要说明的是, 所述路径计算单元还包括:
维护模块 705 , 用于存储、 删除预订业务的路径信息。 具体的, 将预订业 务的连接信息存储到存储模块 704中, 和 /或, 从存储模块 704中删除预订业 务的连接信息,预定业务的连接信息包括: 预定业务的路径信息和时间属性参 数。
本发明实施例中, 维护模块 705在预订业务连接信息库中存储、删除预订 业务的路径信息。
上述装置和系统内的各模块之间的信息交互、执行过程等内容, 由于与本 发明方法实施例基于同一构思, 具体内容可参见本发明方法实施例中的叙述, 此处不再赞述。
综上所述,本发明实施例提供的技术方案中,在不增加现有信令和路由的 负担和复杂度的情况下,设置专门计算预订业务路径的路径计算单元, 所述路 径计算单元保存有流量工程数据信息和预订业务连接信息,路径计算客户生成 的预订业务请求消息中设置有建立预订业务的时间属性参数,路径计算单元根 据时间属性参数和流量工程数据信息以及预订业务连接信息计算预订业务的 路径, 没有增加信令和路由的负担和复杂度, 实现快速、 方便地开通预订业务 的目的。
进一步的,本发明实施例提供的技术方案中,路径计算单元将预订业务的 路径信息发送给路径计算客户之后 ,所述路径计算单元还在预订业务连接信息 库中记录下该条预订业务的路径信息,从而为快速、方便的预订业务提供了条 件。
进一步的, 本发明实施例提供技术方案中, 当业务持续时间到达后, 所述 路径计算单元还接收拆除预订业务路径成功通知消息,从预订业务连接信息库 中删除预订业务的路径信息, 提高了资源利用率。
通过以上的实施方式的描述,本领域的技术人员可以清楚地了解到本发明 可借助软件加必需的硬件平台的方式来实现, 当然也可以全部通过硬件来实 施, 但很多情况下前者是更佳的实施方式。 基于这样的理解, 本发明的技术方 案对背景技术做出贡献的全部或者部分可以以软件产品的形式体现出来,该计 算机软件产品可以存储在存储介质中, 如 ROM/RAM、磁碟、 光盘等, 包括若 干指令用以使得一台计算机设备(可以是个人计算机, 服务器, 或者网络设备 等 )
Figure imgf000015_0001
行了阐述,以上实施例的说明只是用于帮助理解本发明实施例的方法及其核心 思想; 同时, 对于本领域的一般技术人员, 依据本发明实施例的思想, 在具体 实施方式及应用范围上均会有改变之处, 综上所述,本说明书内容不应理解为 对本发明实施例的限制。

Claims

权 利 要 求
1、 一种预订路径的方法, 其特征在于, 包括:
接收预订业务请求消息, 所述预订业务请求消息中包括时间属性参数; 根据所述时间属性参数和流量工程数据信息以及已有的预订业务连接信 息计算所述预订业务请求消息所请求的预订业务的路径,将计算出的预订业务 的路径信息发送给路径计算客户。
2、根据权利要求 1所述的预订路径的方法, 其特征在于: 所述预订业务请 求消息是根据路径计算协议 PCEP生成的。
3、根据权利要求 1所述的预订路径的方法, 其特征在于, 所述根据时间属 性参数和流量工程数据信息以及已有的预订业务连接信息计算所述预订业务 请求消息所请求的预订业务的路径包括:
根据流量工程数据信息和已有的预订业务连接信息,划分出预订业务所需 时间能使用的拓朴资源 ,基于划分出的拓朴资源和时间属性参数计算预订业务 的路径。
4、根据权利要求 1所述的预订路径的方法, 其特征在于, 所述将计算出的 预订业务路径信息发送给路径计算客户之后 , 进一步包括:
存储所述预订业务请求消息所请求的预订业务的连接信息,所存储的预定 业务的连接信息包括: 所述计算出的预订业务的路径信息和时间属性参数。
5、 根据权利要求 1、 3或 4任一项所述的预订路径的方法, 其特征在于, 进 一步包括:
接收拆除预订业务路径成功的通知消息, 删除预订业务的连接信息。
6、 一种预订路径的方法, 其特征在于, 包括:
生成预订业务请求消息, 所述预订业务请求消息中包括时间属性参数,将 所述预订业务请求消息发送给路径计算单元;
接收路径计算单元返回的预订业务的路径信息,所述预订业务的路径信息 由路径计算单元根据时间属性参数和流量工程数据信息以及已有的预订业务 连接信息计算获得。
7、 根据权利要求 6所述的预订路径的方法, 其特征在于:
所述生成预订业务请求消息包括: 根据路径计算协议 PCEP生成所述预订业务请求消息。
8、根据权利要求 6所述的预订路径的方法, 其特征在于, 接收路径计算单 元返回的预订业务的路径信息之后, 进一步包括:
发送指示激活预订业务路径的消息给预订业务路径上的节点。
9、 根据权利要求 6所述的预订路径的方法, 其特征在于, 进一步包括: 发送指示拆除预订业务路径的消息给预订业务路径上的节点 ,如果拆除预 订业务路径成功, 发送拆除预订业务路径成功的通知消息给路径计算单元。
10、 一种预订路径的系统, 其特征在于, 包括:
路径计算客户, 用于生成预订业务请求消息, 所述预订业务请求消息中包 括时间属性参数, 并将所述预订业务请求消息发送路径计算单元;
路径计算单元, 用于接收路径计算客户发送的预订业务请求消息, 并根据 所述时间属性参数和流量工程数据信息以及已有的预订业务连接信息计算所 述预订业务请求消息所请求的预订业务的路径,将计算得到的预订业务的路径 信息发送给路径计算客户。
11、 一种路径计算客户, 其特征在于, 包括:
请求消息生成模块, 用于生成预订业务请求消息, 所述预订业务请求消息 中包括时间属性参数;
请求消息发送模块,用于将所述请求消息生成模块生成的预订业务请求消 息发送给路径计算单元;
路径信息接收模块,用于接收所述路径计算单元发送的所述预订业务请求 消息所请求的预订业务的路径信息,所述预订业务请求消息所请求的预订业务 的路径信息由路径计算单元根据所述时间属性参数和流量工程数据信息以及 已有的预订业务连接信息计算获得。
12、 一种路径计算单元, 其特征在于, 包括:
请求消息接收模块, 用于接收预订业务请求消息, 所述请求消息中包括时 间属性参数;
路径计算模块,用于根据预订业务请求消息中的时间属性参数和流量工程 数据信息以及已有的预订业务连接信息,计算所述预订业务请求消息所请求的 预订业务的路径; 路径信息发送模块,用于将路径计算模块计算出的预订业务的路径信息发 送给路径计算客户。
13、 根据权利要求 12所述的路径计算单元, 其特征在于, 还包括: 存储模块, 用于储存所述流量工程数据信息和预订业务连接信息。
14、 根据权利要求 12所述的路径计算单元, 其特征在于, 还包括: 维护模块, 用于将所述预订业务的连接信息存储到所述存储模块中, 和 / 或,从所述存储模块中删除所述预订业务的连接信息,所述预定业务的连接信 息包括: 所述预定业务的路径信息和时间属性参数。
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