WO2011015142A1

WO2011015142A1 - System and method for establishing switch connection in automatically switched optical network

Info

Publication number: WO2011015142A1
Application number: PCT/CN2010/075728
Authority: WO
Inventors: 李士雷
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-08-06
Filing date: 2010-08-05
Publication date: 2011-02-10
Anticipated expiration: 2012-02-06
Also published as: CN101990139B; CN101990139A

Abstract

A method for establishing a switch connection in an Automatically Switched Optical Network (ASON) is provided, wherein the method includes that: a source User Network Interface-Network (UNI-N) of a service network receives a service establishment request message sent by a user network, and starts a service establishment of a service layer; said source UNI-N applies for a virtual interface of the service layer service; said source UNI-N queries a routing according to routing constraint conditions in said service establishment request message, and establishes the service layer service in said service network; said source UNI-N applies for an upstream slot label of a client layer service, and sets a cross to a corresponding downstream slot label of the service layer service from said upstream slot label of the client layer service; said destination UNI-N applies for a downstream slot label of the client layer service, and sets a cross to the corresponding downstream slot label of the client layer service from said upstream slot label of the service layer service; said destination User Network Interface-Customer (UNI-C) returns a client layer Reservation (Resv) signaling, and completes the establishment of the switch connection. The present invention ensures the relative independence of the operation between the client layer service and the service layer service.

Description

自动交换光网络中交换连接的建立系统及方法 System and method for establishing exchange connection in automatic switched optical network

技术领域本发明涉及自动交换光网络 ( Automatic Switched Optical Network , ASON ) , 尤其涉及一种 ASON中交换连接的建立系统及方法。 TECHNICAL FIELD The present invention relates to an Automatic Switched Optical Network (ASON), and more particularly to a system and method for establishing a switched connection in an ASON.

背景技术 Background technique

ASON基于传统光传送网发展而来，在不需要人为管理和控制的条件下，可以依据自身所配置的一系列路由、信令及自动发现等协议机制的运作，按用户的请求来建立符合用户需求的光信道。这一革命性进步为光网络的发展带来了质的飞跃，同时也推动了多种新型业务和应用的发展。交换连接 ( Switched Connection, SC )是一种根据用户节点的请求而建立的连接，又称为信令型连接。这种连接是由控制平面的通信终端利用信令协议消息交换建立的。交换连接的发起和维护都由控制平面来完成。控制平面通过用户-网络接口（User Network Interface, UNI )接收用户传来的请求，经过处理后在传输平面为这个请求提供一条具体的可满足用户需求的光通道，并把结果报告给管理平面。管理平面在这种连接的建立过程中并不起直接作用。正是由于交换连接的引入，传输网才能根据用户节点的需求自动建立光通路，所以交换连接是整个 ASON工作的核心所在。较高的资源利用率和较强的保护恢复能力是 ASON网络的一大特色，而提高交换连接业务对网络中可能出现的各种故障的抵御能力，则是交换连接所追求的重要目标。目前 ASON网络只能在单域内提供诸如 1 + 1保护和预制 /实时恢复以及 M: N保护等保护恢复手段，来预防网络故障对业务的破坏。交换连接业务是跨越了用户网和服务网两个域的业务，它的首末节点是位于用户网的用户侧接口（User Network Interface-Customer, U I-C ) , 途经服务网，服务网的网络拓朴和流量参数对用户网是屏蔽的，因此无法实施 ASON单域内的端到端的保护恢复措施。这样，就势必降低了交换连接业务的故障抵御能力。目前，针对交换连接的保护和恢复，业界并没有一个确定的方法。而随着通讯技术的日益发展，交换连接的保护和恢复需求却迫在眉睫。 ASON is developed based on the traditional optical transport network. Under the condition of no need for human management and control, ASON can establish a user according to the user's request according to the operation of a series of routing, signaling and automatic discovery protocols. The optical channel required. This revolutionary advancement has brought about a qualitative leap in the development of optical networks, and has also promoted the development of a variety of new services and applications. A Switched Connection (SC) is a connection established based on a request from a user node, also known as a signaling connection. This connection is established by the communication terminal of the control plane using a signaling protocol message exchange. The initiation and maintenance of the switched connection is done by the control plane. The control plane receives the request from the user through the User Network Interface (UNI). After processing, the control plane provides a specific optical channel for the request to meet the user's requirements on the transmission plane, and reports the result to the management plane. The management plane does not play a direct role in the establishment of this connection. It is precisely because of the introduction of the exchange connection that the transmission network can automatically establish an optical path according to the needs of the user node, so the exchange connection is the core of the entire ASON work. Higher resource utilization and stronger protection and recovery capabilities are a major feature of the ASON network. Improving the resistance of the switched connection service to various faults that may occur in the network is an important goal pursued by the exchange connection. At present, ASON networks can only provide protection recovery methods such as 1 + 1 protection and pre-production / real-time recovery and M: N protection in a single domain to prevent network failures from disrupting the business. The switch connection service spans the services of the user network and the service network. The first and last nodes are the User Network Interface-Customer (U IC ) located on the user network, and the service network is used. Park and traffic parameters are shielded from the user network, so they cannot be implemented. End-to-end protection recovery measures within ASON single domain. In this way, it is bound to reduce the fault resilience of the switched connection service. Currently, there is no definitive method for the protection and recovery of switched connections. With the development of communication technology, the protection and recovery requirements of exchange connections are imminent.

发明内容本发明所要解决的技术问题，在于需要提供一种自动交换光网络中交换连接的建立系统及方法，以实现交换连接在服务网内部的保护和恢复。为了解决上述技术问题，本发明提供了一种自动交换光网络中交换连接的建立方法，包括：服务网的源网络侧接口（U I-N )收到用户网发送的业务建立请求消息，启动服务层业务建立；所述源 U I-N申请服务层业务虚接口，将所述服务层业务虚接口作为服务层业务的客户虚接口和客户层业务的服务虚接口，分别存储到服务层业务和客户层业务中；所述源 U I-N根据所述业务建立请求消息中的路由约束条件查询路由，找到目的 UNI-N , 并以源 UNI-N节点为首节点，以目的 UNI-N为尾节点，在所述服务网内建立服务层业务；所述源 U I-N申请客户层业务上游时隙标签，通过所述服务虚接口找到所述服务层业务，设置所述客户层业务上游时隙标签到对应的服务层业务下游时隙标签的交叉，向所述目的 U I-N发送通道（Path )信令，并将所述客户层业务上游时隙标签作为所述服务层业务在首节点的上下业务时隙存储到服务层；所述目的 U I-N收到所述 Path信令后，申请客户层业务下游时隙标签，通过所述服务虚接口找到所述服务层业务，设置服务层业务上游时隙标签到对应的客户层业务下游标签的交叉，向目的用户侧接口（ U I-C )发送 Path 信令，并将所述客户层业务下游时隙标签作为所述服务层业务在尾节点的上下业务时隙存储到服务层；以及所述目的 U I-C返回客户层资源预留（Resv )信令，完成交换连接的建立。所述服务层业务，在所述首节点申请服务层业务下游时隙标签，在所述尾节点申请服务层业务上游时隙标签，首尾不设置交叉；并在所述目的 U I-N 申请虚接口，作为所述目的 U I-N服务层的客户接口和客户层的服务接口。所述源 U I-N申请客户层业务上游时隙标签的步骤之前，所述方法还包括：所述源 U I-N申请服务层业务下游时隙标签，并在申请成功后发送 Path 信令到中间节点；所述中间节点收到所述 Path信令后，申请服务层业务上游时隙标签和服务层业务下游时隙标签；所述中间节点成功申请服务层业务上游时隙标签和服务层业务下游时隙标签后，发送 Path信令到所述目的 U I-N。所述目的 U I-C返回客户层回复 Resv信令的步骤之后，所述方法还包括：所述源 U I-N收到所述客户层 Resv信令后，完成服务层工作连接的建立。完成服务层工作连接的建立的步骤之后，所述方法还包括：若所述服务层业务包含有保护连接，则完成每条所述保护连接的建立。所述方法还包括：服务层业务的工作连接上报告警到首节点；所述首节点确定工作保护均断掉，则以存储的在首节点的上下业务时隙为服务层业务的上下业务时隙参数，在所述首节点与尾节点之间进行单域内业务重路由查询；所述重路由查询成功后，所述首节点发起恢复连接建立，在成功申请服务层业务下游时隙标签后，设置客户层业务上游时隙标签到服务层下游时隙标签的交叉，发送 Path信令到所述尾节点；所述尾节点收到所述 Path信令并成功申请服务层业务上游时隙标签后，设置客户层业务下游时隙标签到服务层业务上游时隙标签的交叉，返回 Resv 信令；以及所述首节点收到 Resv信令后，服务层业务成功恢复。所述方法还包括：源 U I-N收到用户网发送的交换连接通道拆除（PathTear )信令后，释放本地客户层连接的客户层业务上游时隙标签，删除本地客户层连接信息，并请求删除对应的低层业务；源 UNI-N的低层业务释放服务层业务下游时隙标签，经中间节点向目的 U I-N发送 PathTear信令；以及目的 U I-N收到 PathTear信令后，释放本地客户层连接的客户层业务下游时隙标签，删除客户层连接信息，并发送 PathTear信令到用户网目的 U I-C, 完成客户层连接的删除。 SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a system and method for establishing a switched connection in an automatic switched optical network, so as to implement protection and recovery of the switched connection within the service network. In order to solve the above technical problem, the present invention provides a method for establishing a switched connection in an automatic switched optical network, comprising: receiving a service establishment request message sent by a user network by a source network side interface (U IN ) of the service network, and starting a service layer The service U is applied to the service layer service virtual interface, and the service layer service virtual interface is used as the service virtual interface of the service layer service and the service virtual interface of the client layer service, and is respectively stored in the service layer service and the client layer service. The source U IN queries the route according to the routing constraint condition in the service establishment request message, finds the destination UNI-N, and takes the source UNI-N node as the head node, and the destination UNI-N as the tail node, in the Establishing a service layer service in the service network; the source U IN applies for an upstream slot label of the client layer service, finds the service layer service through the service virtual interface, and sets an upstream slot label of the client layer service to a corresponding service layer. Interleaving the downstream slot label of the service, sending a path signaling to the destination U IN, and using the upstream slot label of the client layer service as the The service layer service is stored in the upper and lower service slots of the first node to the service layer. After receiving the Path signaling, the destination U IN requests the downstream slot label of the client layer service, and finds the service layer by using the service virtual interface. Service, setting the intersection of the upstream slot label of the service layer service to the downstream label of the corresponding client layer service, sending Path signaling to the destination user side interface (U IC ), and using the downstream slot label of the client layer service as the service Layer service on the tail node The lower service time slot is stored to the service layer; and the destination U IC returns the client layer resource reservation (Resv) signaling to complete the establishment of the exchange connection. The service layer service, in the first node, apply for a service layer service downstream time slot label, apply for a service layer service upstream time slot label at the tail node, and do not set an intersection at the beginning and the end; and apply for a virtual interface in the destination U IN, As the service interface of the client interface and client layer of the U IN service layer of the purpose. The method further includes: the source U IN applying for a downstream time slot label of the service layer service, and sending the Path signaling to the intermediate node after the application succeeds; After receiving the Path signaling, the intermediate node applies for the upstream slot label of the service layer service and the downstream slot label of the service layer service; the intermediate node successfully applies for the upstream slot label of the service layer service and the downstream slot of the service layer service. After the label, Path signaling is sent to the destination U IN. After the destination U IC returns to the client layer to reply to the Resv signaling, the method further includes: after the source U IN receives the client layer Resv signaling, completing the establishment of the service layer working connection. After the step of establishing the service layer working connection is completed, the method further includes: if the service layer service includes a protection connection, completing establishment of each of the protection connections. The method further includes: reporting the alarm to the first node on the working connection of the service layer service; and determining, by the first node, that the work protection is broken, and storing the uplink and downlink service time slots of the first node as the service business of the service layer service a slot parameter, performing a single intra-domain service re-routing query between the first node and the tail node; after the re-routing query succeeds, the first node initiates a recovery connection establishment, and successfully applies for service After the downstream slot label of the service layer service, the intersection of the upstream slot label of the client layer service to the downstream slot label of the service layer is set, and Path signaling is sent to the tail node; the tail node receives the Path signaling and succeeds. After the upstream slot label of the service layer service is applied, the intersection of the downstream slot label of the client layer service to the upstream slot label of the service layer service is set, and the Resv signaling is returned; and the service layer service succeeds after the first node receives the Resv signaling. restore. The method further includes: after receiving the PathTear signaling sent by the user network, the source U IN releases the upstream slot label of the client layer service connected by the local client layer, deletes the local client layer connection information, and requests to delete. Corresponding lower layer service; the lower layer service of the source UNI-N releases the downstream slot label of the service layer service, and sends the PathTear signaling to the destination U IN via the intermediate node; and the destination U IN receives the PathTear signaling, and then releases the local client layer connection. The downstream slot label of the client layer service deletes the client layer connection information, and sends PathTear signaling to the UIC of the user network to complete the deletion of the client layer connection.

为了解决上述技术问题，本发明还提供了一种自动交换光网络中交换连接的建立系统，其包括源网络侧接口（ U I-N ) 、目的 U I-N以及目的用户侧接口（U I-C ) ，其中：所述源 U I-N, 位于服务网，所述源 U I-N设置为：接收用户网发送的业务建立请求消息后启动服务层业务建立；申请服务层业务虚接口，将所述服务层业务虚接口作为服务层业务的客户虚接口和客户层业务的服务虚接口，分别存储到服务层业务和客户层业务中；根据所述业务建立请求消息中的路由约束条件查询路由，找到目的 UNI-N, 并以源 UNI-N节点为首节点，以目的 U I-N为尾节点，在所述服务网内建立服务层业务；申请客户层业务上游时隙标签，通过所述服务虚接口找到所述服务层业务，设置所述客户层业务上游时隙标签到对应的服务层业务下游时隙标签的交叉，向所述目的 U I-N发送通道（Path )信令，并将所述客户层业务上游时隙标签作为所述服务层业务在首节点的上下业务时隙存储到服务层；所述目的 U I-N设置为：收到 Path信令后，申请客户层业务下游时隙标签，通过所述服务虚接口找到所述服务层业务，设置服务层业务上游时隙标签到对应的客户层业务下游标签的交叉，向所述目的 U I-C发送所述 Path 信令，并将所述客户层业务下游时隙标签作为所述服务层业务在尾节点的上下业务时隙存储到服务层；所述目的 U I-C设置为：反馈客户层 Resv信令，指示交换连接的建立。所述源 U I-N还设置为：收到服务层业务的工作连接上报的告警，确定工作保护均断掉，则以保存在存储的首节点的上下业务时隙为服务层业务的上下业务时隙参数，在自身与尾节点之间进行单域内业务重路由查询，发起恢复连接建立，并在成功申请服务层下游时隙标签后，设置客户层上游时隙标签到下游时隙标签的交叉，发送 Path信令到所述尾节点；所述目的 U I-N还设置为：收到 Path信令并成功申请服务层业务上游时隙标签后，设置客户层业务下游时隙标签到服务层业务上游时隙标签的交叉，返回 Resv信令，完成服务层业务的恢复。所述源 U I-N 还设置为：收到用户网发送的交换连接通道拆除 ( PathTear )信令后，释放本地客户层连接的客户层业务上游时隙标签，删除本地客户层连接信息，低层业务释放服务层业务下游时隙标签，经中间节点向所述目的 U I-N发送 PathTear信令；所述目的 U I-N还设置为：收到 PathTear信令后，释放本地客户层连接的客户层业务下游时隙标签，删除客户层连接信息，并发送 PathTear信令到用户网目的 U I-C, 完成客户层连接的删除。 In order to solve the above technical problem, the present invention further provides a system for establishing a switched connection in an automatic switched optical network, comprising a source network side interface (U IN ), a destination U IN and a destination user side interface (U IC ), wherein: The source U IN is located in the service network, and the source U IN is configured to: start a service layer service establishment after receiving a service establishment request message sent by the user network; apply for a service layer service virtual interface, and use the service layer service virtual interface as The virtual interface of the client layer of the service layer service and the service virtual interface of the client layer service are respectively stored in the service layer service and the client layer service; the route is searched according to the routing constraint condition in the service establishment request message, and the destination UNI-N is found, and The source UNI-N node is used as the head node, and the destination U IN is the tail node, and the service layer service is established in the service network; the upstream slot label of the client layer service is applied, and the service layer service is found through the service virtual interface. And setting an intersection of the upstream slot label of the client layer service to a downstream slot label of the corresponding service layer service, and sending the identifier to the destination U IN Channel signaling, and storing the upstream slot label of the client layer service as the service layer service in the upper and lower service time slots of the first node to the service layer; The destination U IN is set to: after receiving the Path signaling, request a downstream slot label of the client layer service, find the service layer service by using the service virtual interface, and set an upstream slot label of the service layer service to the corresponding client layer. Transmitting the downstream label of the service, sending the Path signaling to the destination U IC, and storing the downstream slot label of the client layer service as the serving layer service in the upper and lower service slots of the tail node to the service layer; The U IC described is set to: feedback client layer Resv signaling, indicating the establishment of the switched connection. The source U IN is further configured to: receive an alarm reported by the working connection of the service layer service, and determine that the working protection is broken, so that the upper and lower service slots stored in the stored first node are the upper and lower service slots of the service layer service. The parameter performs a single-domain service re-routing query between itself and the tail node, initiates a recovery connection establishment, and after successfully applying for the downstream layer slot label of the service layer, sets the intersection of the upstream slot label of the client layer to the downstream slot label, and sends Path signaling to the tail node; the destination U IN is further configured to: after receiving the Path signaling and successfully applying the upstream slot label of the service layer service, setting the downstream slot label of the client layer service to the upstream slot of the service layer service The intersection of the tags, returning Resv signaling, and completing the recovery of the service layer services. The source U IN is further configured to: after receiving the PathTear signaling sent by the user network, release the upstream slot label of the client layer service connected by the local client layer, delete the local client layer connection information, and release the low layer service. The downstream slot label of the service layer service sends the PathTear signaling to the destination U IN via the intermediate node. The destination U IN is further configured to: after receiving the PathTear signaling, release the downstream slot of the client layer service connected by the local client layer. Label, delete the client layer connection information, and send PathTear signaling to the U IC of the user network to complete the deletion of the client layer connection.

为了解决上述技术问题，本发明还提供了一种自动交换光网络中的网络侧接口（U I-N ) , 其设置为：位于服务网；当所述 U I-N作为源 U I-N,接收用户网发送的业务建立请求消息后启动服务层业务建立；申请服务层业务虚接口，将所述服务层业务虚接口作为服务层业务的客户虚接口和客户层业务的服务虚接口，分别存储到服务层业务和客户层业务中；根据所述业务建立请求消息中的路由约束条件查询路由，找到目的 UNI-N , 并以源 UNI-N节点为首节点，以目的 UNI-N为尾节点，在所述服务网内建立服务层业务；申请客户层业务上游时隙标签，通过所述服务虚接口找到所述服务层业务，设置所述客户层业务上游时隙标签到对应的服务层业务下游时隙标签的交叉，向所述目的 U I-N发送通道（Path )信令，并将所述客户层业务上游时隙标签作为所述服务层业务在首节点的上下业务时隙存储到服务层；当所述 U I-N作为目的 U I-N, 接收 Path信令，申请客户层业务下游时隙标签，通过所述服务虚接口找到所述服务层业务，设置服务层业务上游时隙标签到对应的客户层业务下游标签的交叉，向所述目的 U I-C发送所述 Path信令，并将所述客户层业务下游时隙标签作为所述服务层业务在尾节点的上下业务时隙存储到服务层。所述的 UNI-N还设置为：当所述 U I-N作为源 U I-N, 收到服务层业务的工作连接上报的告警，确定工作保护均断掉，则以保存在存储的首节点的上下业务时隙为服务层业务的上下业务时隙参数，在自身与尾节点之间进行单域内业务重路由查询，发起恢复连接建立，并在成功申请服务层下游时隙标签后，设置客户层上游时隙标签到下游时隙标签的交叉，发送 Path信令到所述尾节点；当所述 U I-N作为目的 U I-N, 收到 Path信令并成功申请服务层业务上游时隙标签后，设置客户层业务下游时隙标签到服务层业务上游时隙标签的交叉，返回 Resv信令，完成服务层业务的恢复。所述的 UNI-N还设置为：当所述 U I-N作为源 U I-N, 收到用户网发送的交换连接通道拆除 ( PathTear )信令后，释放本地客户层连接的客户层业务上游时隙标签，删除本地客户层连接信息，低层业务释放服务层业务下游时隙标签，经中间节点向所述目的 U I-N发送 PathTear信令；当所述 U I-N作为目的 U I-N, 收到 PathTear信令后，释放本地客户层连接的客户层业务下游时隙标签，删除客户层连接信息，并发送 PathTear 信令到用户网目的 UNI-C, 完成客户层连接的删除。 In order to solve the above technical problem, the present invention further provides a network side interface (U IN ) in an automatic switched optical network, which is set to: located in a service network; when the U IN is used as a source U IN, the receiving user network sends After the service establishment request message is started, the service layer service establishment is started; the service layer service virtual interface is applied, and the service layer service virtual interface is used as The virtual interface of the client of the service layer service and the service virtual interface of the client layer service are respectively stored in the service layer service and the client layer service; the route is searched according to the routing constraint in the service establishment request message, and the destination UNI-N is found, and The source UNI-N node is used as the first node, and the destination UNI-N is used as the tail node, and the service layer service is established in the service network; the upstream slot label of the client layer service is applied, and the service layer service is found through the service virtual interface. And setting an intersection of the upstream slot label of the client layer service to a downstream slot label of the corresponding service layer service, sending a path signaling to the destination U IN, and using the upstream slot label of the client layer service as The service layer service is stored in the upper and lower service time slots of the first node to the service layer; when the U IN is used as the destination U IN, the path signaling is received, and the downstream time slot label of the client layer service is applied, and the virtual interface is found through the service virtual interface. The service layer service is configured to set an intersection of an upstream slot label of the service layer service to a downstream label of the corresponding client layer service, and send the Path signaling to the destination U IC. And storing the downstream time slot label of the client layer service as the service layer service in the upper and lower service time slots of the tail node to the service layer. The UNI-N is further configured to: when the U IN is used as the source U IN, and receives an alarm reported by the working connection of the service layer service, and determines that the work protection is broken, the upper and lower services stored in the stored first node are The time slot is the upper and lower service time slot parameters of the service layer service, and the service rerouting query in the single domain is performed between the self and the tail node, and the restoration connection is initiated, and after the time slot label of the downstream layer of the service layer is successfully applied, the upstream of the client layer is set. Interval of the slot label to the downstream slot label, sending Path signaling to the tail node; when the U IN is used as the destination U IN, after receiving the Path signaling and successfully applying for the upstream slot label of the service layer service, setting the client layer The service downstream slot label crosses the upstream slot label of the service layer service, returns Resv signaling, and completes service layer service recovery. The UNI-N is further configured to: when the U IN is used as the source U IN, after receiving the PathTear signaling sent by the user network, releasing the upstream slot label of the client layer service connected by the local client layer Deleting the local client layer connection information, the lower layer service releases the downstream slot label of the service layer service, and sends the PathTear signaling to the destination U IN via the intermediate node; when the U IN is the destination U IN, after receiving the PathTear signaling, Release local customers The downstream slot label of the client layer service connected to the layer deletes the client layer connection information, and sends PathTear signaling to the UNI-C of the user network to complete the deletion of the client layer connection.

与现有技术相比，本发明通过分层的方式建立交换连接，实现了将 ASON 单域内的保护恢复策略应用到单域服务网的交换连接，实现了客户层 SC在服务网内部部分继承了服务网内部的保护和恢复策略，从而完成了交换连接在单域服务网内部的保护和恢复，提高了 SC保护恢复的效率以及网络资源的利用率，提高了交换连接业务的故障抵御能力。 Compared with the prior art, the present invention establishes a switched connection in a layered manner, and implements a switching connection in which the protection recovery policy in the ASON single domain is applied to the single domain service network, and the client layer SC is inherited internally in the service network. The protection and recovery strategy inside the service network completes the protection and recovery of the switched connection within the single-domain service network, improves the efficiency of the SC protection recovery and the utilization of network resources, and improves the fault resilience of the switched connection service.

附图概述图 1是本发明方法实施例的流程示意图；图 2是本发明中无保护普通 SC业务分层建立实施例的信令流程图；图 3是 SC业务单域服务网内 SNCP保护方法实施例的流程示意图；图 4是保护类型为 1+1 SNCP保护时工作和保护连接均出现故障的实施例示意图；图 5是图 4所示故障实施例的恢复流程示意图；图 6是无保护普通 SC业务首节点发起删除信令的分层传递实施例流程示意图。 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic flow chart of an embodiment of a method according to the present invention; FIG. 2 is a signaling flow chart of an embodiment of a non-protected common SC service layer establishment in the present invention; FIG. 3 is a SNCP protection method in an SC service single domain service network; Figure 4 is a schematic diagram of an embodiment in which both the working and protection connections fail when the protection type is 1+1 SNCP protection; Figure 5 is a schematic diagram of the recovery process of the failure embodiment shown in Figure 4; Figure 6 is unprotected A schematic diagram of a layered delivery embodiment of a normal SC service initiating deletion signaling.

本发明的较佳实施方式以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。考虑到交换连接只有首末节点在用户网，其它部分都在服务网内部，连接故障发生在服务网内部部分的概率较高。如果能够对交换连接的服务网内部的部分釆取保护恢复措施，则能大大地提高交换连接业务的故障抵御能力。图 1是本发明方法实施例的流程示意图。如图 1所示，该方法实施例主要包括如下步骤：步骤 S 110 , 服务网的源网络侧接口（ User Network Interface-Network , UNI-N )节点收到用户网的首 UNI-C发送的业务建立请求消息后，根据业务建立请求消息的服务等级映射到本地对应的保护恢复策略，并启动服务层业务建立；步骤 S120, 服务网的源 U I-N节点申请服务层业务虚接口，并将该虚接口作为服务层业务的客户虚接口和客户层业务的服务虚接口，分别存储到服务层业务和客户层业务中，作为服务层和客户层（即 SC )联系的纽带；步骤 S130, 服务网的源 U I-N节点根据该业务建立请求消息中的路由约束条件查询路由，并根据路由表找到目的 UM-N节点；步骤 S140, 以源 UNI-N节点为源节点，以目的 UNI-N为目的节点，在服务网内建立服务层业务；该服务层业务，在源节点只申请服务层业务下游时隙标签，在目的节点只申请服务层业务上游时隙标签，首尾均不设置交叉；并在目的 U I-N节点申请虚接口，作为目的 U I-N节点服务层的客户接口和客户层的服务接口；步骤 S150, 服务层业务建立成功后，在源 U I-N节点申请客户层业务 ( SC )上游时隙标签，通过服务虚接口找到服务层业务，设置客户层业务上游时隙标签到对应的服务层业务下游标签的交叉，以目的 U I-N为信令下一跳发送通道（Path )信令，并将申请到的客户层业务上游时隙标签作为服务层业务在首节点的上下业务时隙标签存储到服务层；步骤 S160, 目的 U I-N节点收到客户层的 Path信令后，申请客户层业务（SC )下游时隙标签，并通过服务虚接口找到服务层业务，设置服务层业务上游时隙标签到对应的客户层业务下游标签的交叉，以目的 U I-C为信令下一跳发送 Path信令，并将申请到的客户层业务下游时隙标签作为服务层业务在尾节点的上下业务时隙存储到服务层；步骤 S170, 目的 U I-C按照反方向返回客户层资源预留（Reservation, Resv )信令，完成 SC的建立。下面具体介绍本发明交换连接的建立、保护、恢复和删除的具体过程。图 2是本发明中无保护普通 SC业务分层建立实施例的信令流程图。如图 2所示，本实施例中 SC业务的建立分高低两层进行，图中实线部分是客户层连接信令流程，虚线是低层连接信令流程。如图 2所示，本实施例主要包括如下步骤：步骤 210, 用户网源 U I-C发送 SC的 Path信令到服务网的源 U I-N; 步骤 220 , 源 U I-N收到该 SC的 Path信令后，判断出是服务网为单域的 SC业务建立，暂停客户层 SC业务建立；并根据该 SC的 Path信令的服务类型，映射到本地对应的保护恢复策略，并申请服务层业务虚接口，虚接口申请成功后，将该虚接口分别作为服务层业务的客户虚接口和客户层业务的服务虚接口存储到服务层业务和客户层业务中；并开始以本身为首节点、目的 U I-N为尾节点、上下业务时隙未知的单域内的服务层业务工作连接的建立； BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and embodiments, by which the present invention is applied to the technical means to solve the technical problems, and the realization of the technical effect can be fully understood and Implementation. Considering that the switched connection only has the first and last nodes in the user network, and other parts are inside the service network, the probability of connection failure occurring inside the service network is high. If the protection and recovery measures can be taken for the internal part of the service network of the exchange connection, the fault resilience of the exchange connection service can be greatly improved. 1 is a schematic flow chart of an embodiment of a method of the present invention. As shown in FIG. 1, the method embodiment mainly includes the following steps: Step S110: A user network interface-network (UNI-N) node of a service network receives a service sent by a first UNI-C of a user network. After the request message is established, the service level of the service establishment request message is mapped to the local corresponding protection recovery policy, and the service layer service establishment is started. In step S120, the source U IN node of the service network applies for the service layer service virtual interface, and the virtual interface is applied. As a service virtual interface of the client layer of the service layer service and the service virtual interface of the client layer service, the interface is respectively stored in the service layer service and the client layer service, and serves as a link between the service layer and the client layer (ie, SC); Step S130, the service network The source U IN node queries the route according to the routing constraint condition in the service establishment request message, and finds the destination UM-N node according to the routing table. Step S140, the source UNI-N node is used as the source node, and the destination UNI-N is used as the destination node. Establishing a service layer service in the service network; the service layer service only applies for a downstream time slot label of the service layer service at the source node, and only applies at the destination node The upstream slot label of the service layer service is not set to be crossed at the beginning and the end; and the virtual interface is applied to the destination U IN node as the service interface of the client interface and the client layer of the destination U IN node; Step S150, after the service layer service is successfully established Applying the upstream slot label of the client layer service (SC) at the source U IN node, finding the service layer service through the service virtual interface, and setting the intersection of the upstream slot label of the client layer service to the downstream label of the corresponding service layer service, with the purpose of U IN Transmitting the path signaling for the next hop of the signaling, and storing the upstream slot label of the applied client layer service as the serving layer service in the upper and lower service slot labels of the first node to the service layer; Step S160, destination U IN After receiving the Path signaling of the client layer, the node applies for the downstream slot label of the client layer service (SC), and finds the service layer service through the service virtual interface, and sets the upstream slot label of the service layer service to the downstream label of the corresponding client layer service. Crossing, sending the Path signaling with the destination U IC as the next hop of the signaling, and using the downstream slot label of the applied client layer service as the service layer service. The upper and lower service time slots of the tail node are stored in the service layer; in step S170, the destination U IC returns the customer layer resource reservation (Reservation, Resv) signaling in the reverse direction to complete the establishment of the SC. The specific process of establishing, protecting, recovering, and deleting the exchange connection of the present invention is specifically described below. 2 is a signaling flow chart of an embodiment of a layered setup of an unprotected common SC service in the present invention. As shown in FIG. 2, the establishment of the SC service in this embodiment is performed in two layers, the solid line part of the figure is the client layer connection signaling process, and the dashed line is the low layer connection signaling process. As shown in FIG. 2, the embodiment mainly includes the following steps: Step 210: A user network source U IC sends a Path signaling of the SC to a source U IN of the service network. Step 220: The source U IN receives the Path signaling of the SC. After that, it is determined that the service network is a single-domain SC service establishment, and the client layer SC service establishment is suspended. The service type of the path signaling of the SC is mapped to the local corresponding protection recovery policy, and the service layer service virtual interface is applied. After the virtual interface is successfully applied, the virtual interface is stored as a virtual interface of the client layer of the service layer service and a virtual interface of the client layer service to the service layer service and the client layer service; The establishment of the service layer service working connection in the single domain where the tail node and the upper and lower service slots are unknown;

源 U I-N建立服务层业务工作连接时，在首节点只申请业务服务层下游 (出 /入）时隙标签；服务层下游时隙标签申请成功后，发送 Path信令到第一中间节点，本节点不设置交叉；步骤 S230 , 第一中间节点收到服务层工作连接建立的 Path信令后，申请服务层上下游的 (出 /入）时隙标签；服务层上下游时隙标签申请成功后设置交叉，并发送 Path信令到下游节点（第二中间节点）；下游节点依次执行相同的动作，最终发送 Path到目的 U I-N; 步骤 S240 , 目的 U I-N收到服务层工作连接的 Path信令后，申请服务层上游的（出 /入）时隙标签，标签申请成功后不设置交叉；并申请虚接口，在虚接口申请成功后，将该虚接口分别作为服务层业务的客户虚接口存储到服务层业务中，直接向上游节点依次返回 Resv信令；步骤 S250 , 源 U I-N收到下游返回的 Resv信令后，完成服务层工作连接的建立（如果服务层业务还有保护连接，则再次按照步骤 S220到步骤 S240 的顺序，完成各条保护连接的建立）；服务层业务建立完成后，激活客户层 SC的 Path信令处理流程：步骤 S251 ,根据客户层 SC的 Path信令，申请源 U I-N的 SC客户层上游（入 /出）时隙标签；步骤 S252, 客户层上游（入 /出）时隙标签申请成功后，根据客户层的服务层接口找到服务层连接，并将申请到的客户层上游时隙标签存储到服务层连接的存储区域中，作为服务层业务的上业务时隙标签；步骤 S253 , 将申请到的客户层上游（入 /出 ) 时隙标签与对应服务层连接的服务层下游（出 /入）时隙标签建立交叉；步骤 S254, 交叉成功后，以目的 U I-N作为客户层 SC的信令下一跳，发送 SC的 Path信令到目的 U I-N; 步骤 S260, 目的 U I-N收到客户层 SC的 Path信令后，处理流程如下：步骤 S261 , 申请目的 UNI-N的 SC客户层下游（入 /出 ) 时隙标签；步骤 S262, 客户层下游（入 /出）时隙标签申请成功后，根据客户层的服务层接口找到服务层连接，并将申请到的客户层下游时隙标签存储到服务层连接的存储区域中，作为服务层业务的下业务时隙标签；步骤 S263 , 将申请到的客户层下游（入 /出 ) 时隙标签与对应的服务层连接的上游（出 /入）时隙标签建立交叉；步骤 S264, 以目的 U I-C为信令下一跳，发送 SC的 Path信令到目的 U I-C; 步骤 S270, 目的 U I-C按照 SC的 Path信令所经过的节点，向上游逆序回送 SC的 Resv信令直到源 UNI-C; 源 UNI-C收到下游返回的 Resv信令后完成连接建立。图 2中的 Ack Path信令，是 Path信令接收方收到该 Path信令后的确认反馈。 When the source U IN establishes the service layer service working connection, the first node only applies for the downstream (out/in) slot label of the service service layer; after the service layer downstream slot label application is successful, the path signaling is sent to the first intermediate node, The node does not set the crossover; in step S230, after receiving the Path signaling established by the service layer working connection, the first intermediate node applies for the uplink/outbound (in/out) time slot label of the service layer; Set the crossover, and send the Path signaling to the downstream node (the second intermediate node); the downstream node performs the same action in sequence, and finally sends the Path to the destination U IN; Step S240, the destination U IN receives the Path signaling of the working layer working connection After the application is performed, the virtual interface is used as the virtual interface of the service layer service. After the virtual interface is applied successfully, the virtual interface is used as the virtual interface of the service layer service. In the service layer service, the Resv signaling is directly returned to the upstream node. In step S250, the source U IN receives the Resv signaling returned from the downstream, and completes the service layer work. The establishment of the connection (if the service layer service also has a protection connection, the establishment of each protection connection is completed in the order of step S220 to step S240); after the service layer service is established, the path signaling processing flow of the client layer SC is activated. : Step S251, applying the upstream (in/out) slot label of the SC client layer of the source U IN according to the Path signaling of the client layer SC; Step S252, after the client layer upstream (in/out) slot label application is successful, according to the client The service layer interface of the layer finds the service layer connection, and stores the upstream time slot label of the client layer that is applied to the storage area of the service layer connection, as the upper service time slot label of the service layer service; Step S253, the applied client The upstream (in/out) slot label of the layer is overlapped with the downstream (out/in) slot label of the service layer connected to the corresponding service layer; Step S254, after the crossover is successful, the destination U IN is used as the signaling of the client layer SC. After the hop, the path signaling of the SC is sent to the destination U IN. Step S260, after the destination U IN receives the Path signaling of the client layer SC, the processing flow is as follows: Step S261: Applying for the SC client layer downstream of the destination UNI-N (in / Step S262, after the client layer downstream (in/out) slot label application is successful, the service layer connection is found according to the service layer interface of the client layer, and the applied client layer downstream time slot label is stored in the service. In the connected storage area, as the lower service time slot label of the service layer service; Step S263, the upstream (out/in) time slot of the applied client layer downstream (in/out) time slot label and the corresponding service layer Step S264: The destination U IC is used as the next hop of the signaling, and the Path signaling of the SC is sent to the destination U IC. In step S270, the destination U IC sends back the reverse sequence to the node according to the path signaling of the SC. Resv signaling of the SC until the source UNI-C; The source UNI-C completes the connection establishment after receiving the Resv signaling returned from the downstream. The Ack Path signaling in Figure 2 is the acknowledgement feedback after the Path signaling receiver receives the Path signaling.

SC的服务层业务并不知道本业务是客户层 SC的服务层业务，它只会把该业务当作单域内的普通业务，客户层连接对它来说是不可见的。同时客户层连接也不知道它本身被一条服务层业务所承载。当客户层 SC在服务网内部的部分出现故障时，服务层业务也同样会出现故障，此时服务层业务会按照单域内普通业务的保护恢复策略，釆取相应的措施来保证服务层业务的畅通，服务层业务消除故障后也就消除了客户层 SC的连接故障，这样就间接实现了客户层 SC在单域服务网内部分的保护恢复。图 3是 SC业务单域服务网内 SNCP保护方法实施例的流程示意图，以说明客户层 SC的保护和恢复的实施过程。如图 3所示，当图标 4-5之间（即第一中间节点和第二中间节点之间）的光纤断纤时，客户层 SC便会出现故障而中断。此时服务层业务的工作连接会上报告警到服务层业务，服务层业务收到工作连接告警后，按照单域内普通业务的方式启用保护恢复策略，并根据存储在存储区域里的上下业务时隙，将业务从工作连接（2-3-4-5-6-7 ) 倒换到经过第三中间节点和第四中间节点的保护连接 ( 9-10-11-12-13-14 )上去，保证了服务业务上业务时隙（客户层 SC的源 U I-N上游时隙）到下业务时隙（客户层 SC的目的 UNI-N下游时隙）的畅通。服务层业务接通后，客户层的 SC 业务也就接通了，从而实现了 SC 的 1+1 子网连接保护 ( Sub-Network Connection Protection, SNCP ) 。下面说明服务层业务的保护类型为 1+1 SNCP, 工作和保护连接均出现故障时的实施例。如图 4所示，图标 4-5即第一中间节点和第二中间节点之间的光纤、图标 11-12即第三中间节点和第四中间节点之间的光纤均断掉时，客户层 SC便会出现故障而中断。如图 5所示，此时业务的恢复流程如下：步骤 S510, 服务层业务的工作连接上报告警到服务层业务的首节点 "源 U I-N" ；步骤 S520, 首节点 "源 U I-N"确定工作保护均断掉，便以保存在业务存储区的上下业务时隙为服务层业务的上下业务时隙参数，分别以 "源 U I-N" 和 "目的 U I-N" 为首尾节点，进行单域内业务重路由查询；步骤 S530, 单域内业务重路由查询成功后，得到经过第五中间节点和第六中间节点的新的路由（即图中图标为 15-16-17-18-19-20 ) , 服务层业务首节点 "源 U I-N" 发起恢复连接建立，申请服务层下游时隙标签；步骤 S540, 服务层下游时隙标签申请成功后，设置上业务时隙到该标签的交叉，发送 Path信令到下游节点；步骤 S550, 中间节点执行与服务层业务建立时相同的操作；步骤 S560, 尾节点 "目的 U I-N" 收到 Path信令后，申请服务层上游时隙标签；步骤 S570, 服务层上游时隙标签申请成功后，设置下业务时隙到该标签的交叉，并返回 Resv信令到上游节点；步骤 S580, 首节点 "源 U I-N" 收到下游返回的 Resv信令后，服务层业务恢复成功，恢复后的连接如图中图标 15-16-17-18-19-20所示。该过程中，由于服务层业务将客户层 SC分别在 "源 U I-N" 和 "目的 U I-N" 的服务层上下游标签作为服务层业务的上下业务时隙，所以服务层恢复成功后，客户层 SC在单域服务网内部部分的故障也就会自然消失，从而完成了 SC的故障恢复。图 6是无保护普通 SC业务首节点发起删除信令的分层传递实施例流程示意图，图中实线部分是客户层连接的删除信令传递，虚线部分是低层连接的删除信令传递。图 6所示的实施例，主要包括如下步骤：步骤 S610, 用户网源 U I-C发送 SC的通道拆除（ PathTear )信令到服务网的源 UNI-N; 步骤 S620, 源 UM-N收到 PathTear信令后，判断出是服务网为单域的 SC业务删除，则发送 PathTear信令到目的 U I-N, 释放本地客户层连接的客户层上游（入 /出 )业务时隙标签，删除本地客户层连接信息，并发送删除请求以请求删除对应的低层业务；步骤 S630, 源 U I-N的低层业务收到删除请求后，释放服务层下游时隙标签，同时发送 PathTear信令到下游第一中间节点；步骤 S640, 第一中间节点收到服务层工作连接删除的 PathTear信令后，释放服务层上下游的（出 /入）时隙标签，并发送 PathTear信令到下游的第二中间节点；步骤 S650 , 第二中间节点收到第一中间节点发来的 PathTear信令后，释放服务层上下游的（出 /入）时隙标签，并发送 PathTear信令给目的 U I-N; 步骤 S660, 目的 UNI-N收到服务层工作连接的 PathTear信令后，判断出是低层连接的删除，则释放服务层上游的（出 /入）时隙标签；步骤 S670, 目的 U I-N收到上游的 PathTear信令后，判断是客户层连接的删除，则释放本地客户层连接的客户层下游时隙标签，删除客户层连接信息，并发送 PathTear信令到目的 U I-C。上述实施例中，是通过第二中间节点将第一中间节点发送的 PathTear信令转发给目的 U I-N, 在其他的实施例中，如果没有第二中间节点，则可以直接由第一中间节点将 PathTear信令发送给目的 U I-N。客户层 SC删除时，源 U I-N收到客户层 SC的 PathTear信令后，先删除客户层的连接信息，再开始服务层业务的删除，同时发送 PathTear信令到目的 U I-N。对于服务层业务而言，它不知道该删除是客户层 SC的服务层业务删除，还是单域内普通业务的删除，它统一按照单域内普通业务的删除方式进行。因此，客户层 SC和服务层连接的删除过程，由源 U I-N开始同时进行。本发明实施例还提供了一种自动交换光网络中交换连接的建立系统，其包括源 U I-N、目的 U I-N以及目的 U I-C , 其中：源 U I-N, 位于服务网，源 U I-N设置为：接收用户网发送的业务建立请求消息后启动服务层业务建立；申请服务层业务虚接口，将所述服务层业务虚接口作为服务层业务的客户虚接口和客户层业务的服务虚接口，分别存储到服务层业务和客户层业务中；根据所述业务建立请求消息中的路由约束条件查询路由，找到目的 UNI-N,并以源 UNI-N节点为首节点，以目的 UNI-N 为尾节点，在所述服务网内建立服务层业务；申请客户层业务上游时隙标签，通过所述服务虚接口找到所述服务层业务，设置所述客户层业务上游时隙标签到对应的服务层业务下游时隙标签的交叉，向所述目的 U I-N发送通道 ( Path )信令，并将所述客户层业务上游时隙标签作为所述服务层业务在首节点的上下业务时隙存储到服务层；目的 U I-N设置为：收到 Path信令后，申请客户层业务下游时隙标签，通过所述服务虚接口找到所述服务层业务，设置服务层业务上游时隙标签到对应的客户层业务下游标签的交叉，向所述目的 U I-C发送所述 Path信令，并将所述客户层业务下游时隙标签作为所述服务层业务在尾节点的上下业务时隙存储到服务层；目的 U I-C设置为：反馈客户层 Resv信令，指示交换连接的建立。优选的，上述系统中，源 U I-N还设置为：收到服务层业务的工作连接上报的告警，确定工作保护均断掉，则以保存在存储的首节点的上下业务时隙为服务层业务的上下业务时隙参数，在自身与尾节点之间进行单域内业务重路由查询，发起恢复连接建立，并在成功申请服务层下游时隙标签后，设置客户层上游时隙标签到下游时隙标签的交叉，发送 Path信令到所述尾节点；目的 U I-N还设置为：收到 Path信令并成功申请服务层业务上游时隙标签后，设置客户层业务下游时隙标签到服务层业务上游时隙标签的交叉，返回 Resv信令，完成服务层业务的恢复。优选的，上述系统中，源 U I-N还设置为：收到用户网发送的交换连接通道拆除（PathTear )信令后，释放本地客户层连接的客户层业务上游时隙标签，删除本地客户层连接信息，低层业务释放服务层业务下游时隙标签，经中间节点向所述目的 U I-N发送 PathTear信令；所述目的 U I-N还设置为：收到 PathTear信令后，释放本地客户层连接的客户层业务下游时隙标签，删除客户层连接信息，并发送 PathTear信令到用户网目的 U I-C, 完成客户层连接的删除。 The service layer service of the SC does not know that the service is the service layer service of the client layer SC. It only treats the service as a normal service within a single domain, and the client layer connection is invisible to it. At the same time, the client layer connection does not know that it is carried by a service layer service. When the client layer SC fails in the internal part of the service network, the service layer service also fails. At this time, the service layer service will be pressed. According to the protection and recovery strategy of the common service in a single domain, the corresponding measures are taken to ensure the smooth flow of the service layer service. After the service layer service is eliminated, the connection failure of the client layer SC is eliminated, thus indirectly implementing the client layer SC in the single Protection recovery of parts within the domain service network. FIG. 3 is a schematic flowchart of an embodiment of an SNCP protection method in an SC service single domain service network, to illustrate an implementation process of protection and recovery of a client layer SC. As shown in FIG. 3, when the fiber between the icons 4-5 (i.e., between the first intermediate node and the second intermediate node) is broken, the client layer SC is broken and interrupted. At this time, the service connection of the service layer service reports the service to the service layer service. After receiving the work connection alarm, the service layer service enables the protection recovery policy according to the normal service in a single domain, and according to the upper and lower services stored in the storage area. Gap, the service is switched from the working connection (2-3-4-5-6-7) to the protection connection (9-10-11-12-13-14) through the third intermediate node and the fourth intermediate node. The smoothing of the service time slot (the source U IN upstream time slot of the client layer SC) to the lower service time slot (the destination UNI-N downstream time slot of the client layer SC) on the service service is ensured. After the service layer service is connected, the SC service of the client layer is also connected, thus implementing the 1+1 Sub-Network Connection Protection (SNCP) of the SC. The following describes an embodiment in which the protection type of the service layer service is 1+1 SNCP, and both the working and protection connections fail. As shown in FIG. 4, when the icon 4-5, that is, the optical fiber between the first intermediate node and the second intermediate node, and the optical fibers between the icons 11-12, that is, the third intermediate node and the fourth intermediate node are both broken, the client layer The SC will be interrupted and interrupted. As shown in FIG. 5, the recovery process of the service at this time is as follows: Step S510, the first node "source U IN" of the service layer service is reported on the working connection of the service layer service; step S520, the first node "source U IN" is determined. The work protection is broken, and the upper and lower service time slots stored in the service storage area are the upper and lower service time slot parameters of the service layer service, and the "source U IN" and the "destination U IN" are respectively used as the head end nodes to perform the single domain service. Rerouting query; Step S530, after the service rerouting in the single domain is successfully obtained, obtaining a new route through the fifth intermediate node and the sixth intermediate node (ie, the icon in the figure is 15-16-17-18-19-20), The service layer service first node "source U IN" initiates the restoration of the connection establishment, and applies for the service layer downstream time slot label. Step S540, after the service layer downstream time slot label application is successful, set the service time slot to the label cross, and send the Path letter. Order to the downstream node; Step S550, the intermediate node performs the same operation as the service layer service establishment; Step S560, after the tail node "destination U IN" receives the Path signaling, applies for the service layer upstream time slot label; Step S570, the service layer upstream time slot label After the application is successful, the service slot is set to the intersection of the label, and the Resv signaling is returned to the upstream node. Step S580, after the first node "source U IN" receives the Resv signaling returned by the downstream, the service layer service is successfully restored. The restored connection is shown in Figure 15-16-17-18-19-20. In this process, since the service layer service uses the upstream and downstream labels of the service layer service of the client layer SC in the "source U IN" and the "destination U IN" as the upper and lower service slots of the service layer service, after the service layer is successfully restored, the client layer The failure of the SC in the internal part of the single-domain service network will naturally disappear, thus completing the failure recovery of the SC. FIG. 6 is a schematic diagram of a layered delivery embodiment of an unprotected normal SC service head node initiating deletion signaling. The solid line part is the deletion signaling transmission of the client layer connection, and the dotted line part is the deletion signaling transmission of the low layer connection. The embodiment shown in FIG. 6 mainly includes the following steps: Step S610: The user network source U IC sends a path teardown (PathTear) signaling of the SC to the source UNI-N of the service network; step S620, the source UM-N receives the PathTear After the signaling is determined, the service network is deleted for the single-domain SC service, and then the PathTear signaling is sent to the destination U IN, and the upstream (in/out) service time slot label of the client layer connected to the local client layer is released, and the local client layer is deleted. Connect the information, and send a delete request to request to delete the corresponding lower layer service; Step S630, after receiving the delete request, the low layer service of the source U IN releases the downstream slot label of the service layer, and simultaneously sends the PathTear signaling to the downstream first intermediate node; Step S640, after receiving the PathTear signaling deleted by the service layer working connection, the first intermediate node releases the (out/in) time slot label of the upstream and downstream of the service layer, and sends PathTear signaling to the second intermediate node in the downstream; Step S650 After receiving the PathTear signaling sent by the first intermediate node, the second intermediate node releases the (out/in) time slot label of the upstream and downstream of the service layer, and sends PathTear signaling to the destination U IN; Step S660: After receiving the PathTear signaling of the service layer working connection, the destination UNI-N determines that the lower layer connection is deleted, and then releases the (out/in) time slot label upstream of the service layer; Step S670, the destination U IN is received. After the upstream PathTear signaling, it is determined that the client layer connection is deleted, the downstream time slot label of the client layer connected by the local client layer is released, the client layer connection information is deleted, and PathTear signaling is sent to the destination U IC. In the above embodiment, the PathTear signaling sent by the first intermediate node is forwarded to the destination U IN by the second intermediate node. In other embodiments, if there is no second intermediate node, the first intermediate node may directly PathTear signaling is sent to the destination U IN. When the client layer SC is deleted, the source U IN receives the PathTear signaling of the client layer SC, deletes the connection information of the client layer, and then starts the deletion of the service layer service, and simultaneously sends the PathTear signaling to the destination U IN. For the service layer service, it does not know whether the deletion is the service layer service deletion of the client layer SC or the deletion of the normal service in the single domain. Therefore, the deletion process of the client layer SC and the service layer connection is started simultaneously by the source U IN . The embodiment of the present invention further provides a system for establishing an exchange connection in an automatic switched optical network, which includes a source U IN , a destination U IN , and a destination U IC , where: the source U IN is located in the service network, and the source U IN is set to: After the service establishment request message sent by the user network is received, the service layer service establishment is started; the service layer service virtual interface is applied, and the service layer service virtual interface is used as the service virtual interface of the service layer service and the service virtual interface of the client layer service, respectively. To the service layer service and the client layer service; query the route according to the routing constraint condition in the service establishment request message, find the destination UNI-N, take the source UNI-N node as the first node, and take the destination UNI-N as the tail node, Establishing a service layer service in the service network; applying an upstream time slot label of the client layer service, finding the service layer service by using the service virtual interface, and setting an upstream time slot label of the customer layer service to a corresponding service layer service downstream Intersecting the slot label, sending a path signaling to the destination U IN, and using the upstream slot label of the client layer service as the service The layer service is stored in the upper and lower service slots of the first node to the service layer. The destination U IN is set to: after receiving the Path signaling, request the downstream slot label of the client layer service, and find the service layer service through the service virtual interface. Set the service layer service upstream slot label to Transmitting the downstream label of the corresponding client layer service, sending the Path signaling to the destination U IC, and storing the downstream slot label of the client layer service as the service layer service in the uplink and downlink service time slots of the tail node to The service layer; the destination U IC is set to: feedback client layer Resv signaling, indicating the establishment of the switched connection. Preferably, in the foregoing system, the source U IN is further configured to: receive an alarm reported by the working connection of the service layer service, and determine that the working protection is broken, so that the upper and lower service slots stored in the stored first node are service layer services. The upper and lower service time slot parameters are used to perform a single intra-domain service rerouting query between itself and the tail node, initiate a recovery connection establishment, and after successfully applying for the service layer downstream time slot label, set the client layer upstream time slot label to the downstream time slot. The intersection of the label sends the Path signaling to the tail node. The destination U IN is also set to: After receiving the Path signaling and successfully applying the upstream slot label of the service layer service, setting the downstream slot label of the client layer service to the service layer service. The intersection of the upstream slot labels returns the Resv signaling to complete the recovery of the service layer service. Preferably, in the foregoing system, the source U IN is further configured to: after receiving the PathTear signaling sent by the user network, release the upstream slot label of the client layer service connected by the local client layer, and delete the local client layer connection. The low-level service releases the downstream slot label of the service layer service, and sends the PathTear signaling to the destination U IN via the intermediate node; the destination U IN is further configured to: release the client connected to the local client layer after receiving the PathTear signaling The downstream service slot label of the layer service deletes the client layer connection information, and sends PathTear signaling to the UIC of the user network to complete the deletion of the client layer connection.

本发明实施例还提供了一种自动交换光网络中的 UNI-N, 其设置为：位于服务网；当 U I-N作为源 U I-N,接收用户网发送的业务建立请求消息后启动服务层业务建立；申请服务层业务虚接口，将服务层业务虚接口作为服务层业务的客户虚接口和客户层业务的服务虚接口，分别存储到服务层业务和客户层业务中；根据业务建立请求消息中的路由约束条件查询路由，找到目的 U I-N , 并以源 UNI-N节点为首节点，以目的 UNI-N为尾节点，在服务网内建立服务层业务；申请客户层业务上游时隙标签，通过所述服务虚接口找到服务层业务，设置客户层业务上游时隙标签到对应的服务层业务下游时隙标签的交叉，向目的 U I-N发送通道（Path)信令，并将客户层业务上游时隙标签作为服务层业务在首节点的上下业务时隙存储到服务层；当 U I-N作为目的 U I-N, 接收 Path信令，申请客户层业务下游时隙标签，通过服务虚接口找到服务层业务，设置服务层业务上游时隙标签到对应的客户层业务下游标签的交叉，向目的 U I-C发送 Path信令，并将客户层业务下游时隙标签作为服务层业务在尾节点的上下业务时隙存储到服务层。优选的，上述 U I-N还设置为：当 U I-N作为源 U I-N, 收到服务层业务的工作连接上报的告警，确定工作保护均断掉，则以保存在存储的首节点的上下业务时隙为服务层业务的上下业务时隙参数，在自身与尾节点之间进行单域内业务重路由查询，发起恢复连接建立，并在成功申请服务层下游时隙标签后，设置客户层上游时隙标签到下游时隙标签的交叉，发送 Path信令到所述尾节点；当 U I-N作为目的 U I-N, 收到 Path信令并成功申请服务层业务上游时隙标签后，设置客户层业务下游时隙标签到服务层业务上游时隙标签的交叉，返回 Resv信令，完成服务层业务的恢复。优选的，上述 U I-N还设置为：当 U I-N 作为源 U I-N , 收到用户网发送的交换连接通道拆除 (PathTear)信令后，释放本地客户层连接的客户层业务上游时隙标签，删除本地客户层连接信息，低层业务释放服务层业务下游时隙标签，经中间节点向所述目的 U I-N发送 PathTear信令；当 U I-N作为目的 U I-N, 收到 PathTear信令后，释放本地客户层连接的客户层业务下游时隙标签，删除客户层连接信息，并发送 PathTear信令到用户网目的 U I-C, 完成客户层连接的删除。本发明釆用客户层 SC业务和服务层普通单域内业务的分层建立方式，分别将客户层 SC业务在源和目的 UNI-N节点的上、下游时隙作为服务层业务在首尾的上下业务时隙，客户层 SC业务对于服务层业务是透明的，服务层业务就是单域内的一个普通业务，可以釆用单域内的诸如 1 + 1保护和预制 /实时恢复以及 M: N保护等保护恢复措施，来保证服务层业务的畅通，从而实现了客户层 SC在服务网内部部分继承了服务网内部的保护和恢复策略。本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的各模块 /单元可以釆用硬件的形式实现，也可以釆用软件功能模块的形式实现。本发明不限制于任何特定形式的硬件和软件的结合。以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉该技术的人员在本发明所揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。 The embodiment of the present invention further provides a UNI-N in an automatic switched optical network, which is set to: located in the service network; when the U IN is used as the source U IN, the service establishment service message sent by the user network is received, and the service layer service establishment is started. Applying the virtual interface of the service layer service, and using the virtual interface of the service layer as the virtual interface of the client of the service layer service and the virtual interface of the client layer service, respectively, are stored in the service layer service and the client layer service; Routing constraints query routing, find purpose U IN , with the source UNI-N node as the first node and the destination UNI-N as the tail node, establish a service layer service in the service network; apply for the upstream slot label of the client layer service, and find the service layer service through the service virtual interface And setting the upstream slot label of the client layer service to the corresponding time slot label of the service layer service, sending a path signaling to the destination U IN, and using the upstream slot label of the client layer service as the service layer service at the first node. The upper and lower service slots are stored in the service layer; when U IN is used as the destination U IN, the path signaling is received, the downstream slot label of the client layer service is applied, the service layer service is found through the service virtual interface, and the upstream slot label of the service layer service is set to Corresponding to the downstream label of the client layer service, the Path signaling is sent to the destination U IC, and the downstream slot label of the client layer service is stored as the service layer service in the upper and lower service slots of the tail node to the service layer. Preferably, the U IN is further configured to: when U IN is used as the source U IN, and receives an alarm reported by the working connection of the service layer service, and determines that the working protection is broken, the upper and lower service time slots of the stored first node are saved. For the upper and lower service time slot parameters of the service layer service, perform a single intra-domain service re-routing query between itself and the tail node, initiate a recovery connection establishment, and set the client layer upstream time slot label after successfully applying for the service layer downstream time slot label. After the intersection of the downstream slot labels, the Path signaling is sent to the tail node; when the U IN is used as the destination U IN, after receiving the Path signaling and successfully applying for the upstream slot label of the service layer service, the downstream slot of the client layer service is set. The label is crossed to the upstream slot label of the service layer service, and the Resv signaling is returned to complete the recovery of the service layer service. Preferably, the U IN is further configured to: when U IN is used as the source U IN , after receiving the PathTear signaling sent by the user network, releasing the upstream slot label of the client layer service connected by the local client layer, deleting Local client layer connection information, the lower layer service releases the downstream slot label of the service layer service, and the PathTear signaling is sent to the destination U IN via the intermediate node; when the U IN is the destination U IN, after receiving the PathTear signaling, the local client layer is released. The downstream slot label of the connected client layer service deletes the client layer connection information, and sends PathTear signaling to the UIC of the user network to complete the deletion of the client layer connection. The present invention uses the layered establishment manner of the customer layer SC service and the service layer common single domain service, and respectively uses the upper layer and the downstream time slot of the client layer SC service in the source and destination UNI-N nodes as the service layer service in the first and last services. The time slot, the client layer SC service is transparent to the service layer service, and the service layer service is a common service in a single domain, and can be protected and restored in a single domain such as 1 + 1 protection and prefabrication/real time recovery and M: N protection. Measures to ensure the smooth flow of service layer services, thus enabling the client layer SC to inherit the protection and recovery strategy within the service network within the service network. One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct the associated hardware, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software. The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope of the present invention. All should be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

工业实用性本发明通过 SC的分层建立模式，保证了客户层业务和服务层业务操作的相对独立性，既可以把单域服务网内连接的保护恢复策略巧妙地间接应用到 SC上来，又可以实现 SC的连接故障在局部的保护恢复，大大提高了 SC 的保护恢复的效率，同时也提高了网络资源的利用率。如果 SC跨越多个不同域的服务网段，而每个域的服务网段内都釆用这样的保护恢复机制，那么可以实现 SC在不同服务网段内，根据服务网的特点釆用适用于该服务网段的保护恢复策略，从而实现了 SC在整个服务网内保护恢复策略的多样性，提高了 SC对各个服务网段的各种潜在高发风险的抵御能力。 Industrial Applicability The present invention ensures the relative independence of the customer layer service and the service layer service operation through the hierarchical establishment mode of the SC, and can indirectly apply the protection recovery strategy of the connection in the single domain service network to the SC indirectly. The connection failure of the SC can be restored in the local protection, which greatly improves the efficiency of the protection and recovery of the SC, and also improves the utilization of network resources. If the SC traverses the service network segments of multiple different domains, and the protection network is used in the service network segment of each domain, the SC can be implemented in different service network segments according to the characteristics of the service network. The protection and recovery strategy of the service network segment realizes the diversity of the SC protection and recovery strategy in the entire service network, and improves the SC's resistance to various potential high-risk risks of each service network segment.

Claims

Claim

A method for establishing a switched connection in an automatic switched optical network, comprising: receiving, by a source network side interface (U IN ) of a service network, a service establishment request message sent by a user network, and starting service layer service establishment; The application for the service layer service virtual interface, the service layer service virtual interface is used as the service virtual interface of the service layer service and the service virtual interface of the client layer service, and is respectively stored in the service layer service and the client layer service; the source U IN Querying the route according to the routing constraint condition in the service establishment request message, finding the destination UNI-N, taking the source UNI-N node as the first node, and the destination UNI-N as the tail node, establishing the service layer service in the service network. The source U IN applies for the upstream slot label of the client layer service, finds the service layer service through the service virtual interface, and sets the intersection of the upstream slot label of the client layer service to the downstream slot label of the corresponding service layer service. Transmitting channel (Path) signaling to the destination U IN, and using the upstream slot label of the client layer service as the service layer service in the first section The upper and lower service slots are stored in the service layer; after receiving the Path signaling, the destination U IN requests the downstream slot label of the client layer service, finds the service layer service through the service virtual interface, and sets the service layer service. The upstream time slot label is sent to the downstream label of the corresponding client layer service, and the path signaling is sent to the destination user side interface (U IC ), and the downstream time slot label of the client layer service is used as the service layer service at the tail node. The upper and lower service slots are stored to the service layer; and the destination U IC returns the client layer resource reservation (Resv) signaling to complete the establishment of the exchange connection.

2. The method according to claim 1, wherein: the service layer service applies for a service layer service downstream time slot label at the first node, and applies for a service layer service upstream time slot label at the tail node, and does not set the first and last slots. Crossing; and applying a virtual interface at the destination U IN as a service interface of the client interface and the client layer of the destination U IN service layer.

The method of claim 1, wherein, before the step of applying the source U IN to the upstream slot label of the client layer service, the method further includes: applying, by the source U IN, a downstream slot label of the service layer service, And sending the Path signaling to the intermediate node after the application succeeds; after receiving the Path signaling, the intermediate node applies for the upstream slot label of the service layer service and the downstream slot label of the service layer service; the intermediate node successfully applies for the service After the upstream service slot label and the service layer service downstream slot label are sent, the Path signaling is sent to the destination U IN.

4. The method according to claim 1, wherein, after the step of returning the Resv signaling by the client layer to the client layer, the method further comprises: receiving, by the source U IN, the client layer Resv signaling After that, the establishment of the service layer working connection is completed.

The method of claim 4, wherein after the step of establishing the service layer working connection is completed, the method further comprises: if the service layer service includes a protection connection, completing each of the protection connections set up.

6. The method according to claim 1, further comprising: reporting a call to the first node on a working connection of the service layer service; and determining, by the first node, that the work protection is broken, and storing the uplink and downlink service at the first node The gap is the upper and lower service time slot parameters of the service layer service, and the single-domain service re-routing query is performed between the first node and the tail node; after the re-routing query succeeds, the first node initiates a recovery connection establishment, and successfully applies for After the downstream slot label of the service layer service, the intersection of the upstream slot label of the client layer service to the downstream slot label of the service layer is set, and Path signaling is sent to the tail node; the tail node receives the Path signaling and succeeds. After applying the upstream slot label of the service layer service, set the intersection of the downstream slot label of the client layer service to the upstream slot label of the service layer service, and return to Resv. Signaling; and after the first node receives the Resv signaling, the service layer service is successfully restored.

7. The method according to claim 1, further comprising: after receiving the PathTear signaling sent by the user network, the source U IN releases the upstream slot label of the client layer service connected by the local client layer, and deletes The local client layer connects the information and requests to delete the corresponding lower layer service; the lower layer service of the source UNI-N releases the downstream slot label of the service layer service, and sends the PathTear signaling to the destination U IN via the intermediate node; and the destination U IN receives the PathTear letter. After the command, the downstream slot label of the client layer service connected by the local client layer is released, the client layer connection information is deleted, and PathTear signaling is sent to the UIC of the user network to complete the deletion of the client layer connection.

A system for establishing an exchange connection in an automatic switched optical network, comprising: a source network side interface (U IN ), a destination U IN, and a destination user side interface (U IC ), wherein: the source U IN is located in a service network The source U IN is configured to: start a service layer service establishment after receiving a service establishment request message sent by the user network; apply for a service layer service virtual interface, and use the service layer service virtual interface as a client virtual interface and a client of the service layer service; The service virtual interface of the layer service is stored in the service layer service and the client layer service respectively; the route is searched according to the routing constraint condition in the service establishment request message, the destination UNI-N is found, and the source UNI-N node is taken as the first node. Establishing a service layer service in the service network by using a destination U IN as a tail node; applying an upstream slot label of the client layer service, finding the service layer service through the service virtual interface, and setting an upstream slot of the client layer service Labeling the intersection of the downstream slot label of the corresponding service layer service, sending a path signaling to the destination U IN, and performing the service on the client layer The time slot label is stored in the upper and lower service time slots of the first node as the service layer service to the service layer; the destination U IN is set to: after receiving the Path signaling, requesting a downstream time slot label of the client layer service, by using the service The virtual interface finds the service layer service, sets the intersection of the upstream slot label of the service layer service to the downstream label of the corresponding client layer service, sends the Path signaling to the destination U IC, and downlinks the client layer service. The slot label is stored as a service layer service in the upper and lower service slots of the tail node to the service layer; The destination U IC is set to: feedback client layer Resv signaling, indicating establishment of a switched connection.

9. The system according to claim 8, wherein: the source U IN is further configured to: receive an alarm reported by the working connection of the service layer service, determine that the work protection is broken, and save the storage in the first node. The upper and lower service time slots are the upper and lower service time slot parameters of the service layer service, and the service rerouting query in the single domain is performed between the own and the tail node, and the restoration connection establishment is initiated, and after successfully applying for the downstream time slot label of the service layer, the client layer is set. The intersection of the upstream time slot label and the downstream time slot label sends the Path signaling to the tail node. The destination U IN is further configured to: after receiving the Path signaling and successfully applying for the upstream time slot label of the service layer service, setting the client The downstream slot label of the layer service crosses the upstream slot label of the service layer service, and returns Resv signaling to complete the recovery of the service layer service.

10. The system according to claim 8, wherein: the source U IN is further configured to: after receiving the switch connection channel teardown (PathTear) signaling sent by the user network, releasing the upstream of the client layer service connected by the local client layer The slot label, the local client layer connection information is deleted, the lower layer service releases the downstream slot label of the service layer service, and the intermediate node sends the PathTear signaling to the destination U IN. The destination U IN is also set to: after receiving the PathTear signaling The downstream slot label of the client layer service connected by the local client layer is released, the client layer connection information is deleted, and the PathTear signaling is sent to the UIC of the user network to complete the deletion of the client layer connection.

11. A network side interface (U IN ) in an automatic switched optical network, configured to: be located in a service network; when the U IN is used as a source U IN, the service layer service is started after receiving a service establishment request message sent by the user network. Establishing a service layer service virtual interface, and using the service layer service virtual interface as a service virtual interface of the service layer service and a service virtual interface of the client layer service, respectively, are stored in the service layer service and the client layer service; Establish a routing constraint query route in the request message, find the destination UNI-N, and take the source UNI-N node as the first node and the destination UNI-N as the tail node to establish the service layer service in the service network; Service upstream time slot label, by the The service virtual interface finds the service layer service, sets an intersection of the upstream slot label of the client layer service to a downstream slot label of the corresponding service layer service, and sends a path signaling to the destination U IN, and The upstream slot label of the client layer service is stored as the service layer service in the upper and lower service slots of the first node to the service layer; when the U IN is used as the destination U IN, the Path signaling is received, and the downstream slot label of the client layer service is applied. Finding the service layer service by using the service virtual interface, setting an intersection of a service slot service upstream slot label to a corresponding client layer service downstream label, and sending the Path signaling to the destination U IC, and The downstream slot label of the client layer service is stored as the service layer service in the upper and lower service slots of the tail node to the service layer.

12. The U IN of claim 11, further configured to: when the U IN is used as the source U IN, receiving an alarm reported by the working connection of the service layer service, determining that the working protection is broken, and saving The upper and lower service time slots of the stored first node are the upper and lower service time slot parameters of the service layer service, and the single domain intra-service re-routing query is performed between itself and the tail node, the recovery connection is initiated, and the service layer downstream slot label is successfully applied. Then, the intersection of the upstream slot label of the client layer and the downstream slot label is set, and the Path signaling is sent to the tail node; when the U IN is used as the destination U IN, the Path signaling is received and the service layer service upstream is successfully applied. After the slot label, the downstream slot label of the client layer service is set to the intersection of the upstream slot label of the service layer service, and the Resv signaling is returned to complete the recovery of the service layer service.

13. The U IN of claim 11, further configured to: when the U IN is used as the source U IN, after receiving the SwitchTear signaling sent by the user network, releasing the local client layer connection The upstream slot label of the client layer service deletes the local client layer connection information, the lower layer service releases the downstream slot label of the service layer service, and the PathTear signaling is sent to the destination U IN via the intermediate node; when the U IN is the destination U IN, After receiving the PathTear signaling, the downstream slot label of the client layer service connected to the local client layer is released, the client layer connection information is deleted, and the PathTear signaling is sent to the UNI-C of the user network to complete the deletion of the client layer connection.