WO2008074211A1 - Procédé d'ajustement de bande passante dans une transaction de bande passante à la demande et appareil correspondant - Google Patents

Procédé d'ajustement de bande passante dans une transaction de bande passante à la demande et appareil correspondant Download PDF

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Publication number
WO2008074211A1
WO2008074211A1 PCT/CN2007/003350 CN2007003350W WO2008074211A1 WO 2008074211 A1 WO2008074211 A1 WO 2008074211A1 CN 2007003350 W CN2007003350 W CN 2007003350W WO 2008074211 A1 WO2008074211 A1 WO 2008074211A1
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WIPO (PCT)
Prior art keywords
bandwidth
virtual concatenation
network interface
service
adjustment
Prior art date
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PCT/CN2007/003350
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English (en)
French (fr)
Inventor
Zhiping Wu
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP07816893.7A priority Critical patent/EP2037626B1/en
Publication of WO2008074211A1 publication Critical patent/WO2008074211A1/zh
Priority to US12/354,301 priority patent/US20090122811A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0896—Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/5003—Managing SLA; Interaction between SLA and QoS
    • H04L41/5019—Ensuring fulfilment of SLA
    • H04L41/5025—Ensuring fulfilment of SLA by proactively reacting to service quality change, e.g. by reconfiguration after service quality degradation or upgrade
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0064—Admission Control
    • H04J2203/0067—Resource management and allocation
    • H04J2203/0069—Channel allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0082—Interaction of SDH with non-ATM protocols
    • H04J2203/0085—Support of Ethernet

Definitions

  • the present invention relates to a network communication technology, and in particular, to a method and apparatus for adjusting bandwidth in a bandwidth bandwidth demand (BoD) service.
  • BoD bandwidth bandwidth demand
  • Optical transmission networks including Synchronous Digital Hierarchy (SDH), Synchronous Optical Network (SONET), and Optical Transmission Network (OTN)
  • SDH Synchronous Digital Hierarchy
  • SONET Synchronous Optical Network
  • OTN Optical Transmission Network
  • MSTP Multiservice Transport Platform
  • GFP Generic Framing Procedure
  • LCAS Link Capacity Adjustment Scheme
  • VC Virtual Concatenation
  • GFP Generic Framing Procedure
  • LCAS Link Capacity Adjustment Scheme
  • VC Virtual Concatenation
  • the Ethernet service is a soft permanent connection (Soft The Permanent Co., SPC is established.
  • SPC Soft The Permanent Co.
  • the NMS must first statically configure the Virtual Concatenation Group (VCG) to map the Ethernet port of the Ethernet board to the corresponding VCG.
  • VCG Virtual Concatenation Group
  • the NMS initiates the SPC establishment.
  • the SDH channel is established between the source and destination nodes of the Ethernet service according to the bandwidth requirement of the Ethernet service.
  • the virtual pipe in the SDH channel is configured through the network management.
  • the container (Virtual Container, VC) is added to the corresponding VCG, thus establishing the SPC mode Ethernet service.
  • the SDH channel is established by the network management initiation plane, and the Ethernet client layer connection is completely configured by the network management system.
  • the control plane has no client layer service information. The entire process is mainly controlled by the network management system and does not support switching.
  • the Ethernet service is established in the Switched Connection (SC) mode.
  • SC Switched Connection
  • the service bandwidth adjustment is not supported through the User Network Interface (UNI). That is, the customer cannot initiate bandwidth adjustment based on the change of service traffic.
  • Embodiments of the present invention provide a method and apparatus for adjusting bandwidth in a bandwidth on-demand service, and bandwidth adjustment can be performed according to changes in traffic.
  • an embodiment of the present invention provides a method for adjusting bandwidth in a bandwidth on-demand service, including:
  • the user network interface client UNI-C sends a bandwidth adjustment message based on the bandwidth on-demand service to the user network interface network UNI-N through the control plane signaling, where the bandwidth adjustment message includes a bandwidth adjustment amount;
  • the user network interface network adjusts the bandwidth according to the bandwidth adjustment amount and the underlying tunnel granularity.
  • An embodiment of the present invention further provides an apparatus for adjusting bandwidth in a bandwidth on-demand service, where the apparatus is located at a user network interface network, and the apparatus includes a receiving unit and an adjusting unit:
  • the receiving unit is configured to receive a bandwidth adjustment message based on the bandwidth on-demand service sent by the user network interface client by using the control plane signaling, where the bandwidth adjustment message includes a bandwidth adjustment amount;
  • the adjusting unit is configured to adjust a bandwidth according to the bandwidth adjustment amount and an underlay tunnel granularity.
  • the BoD service establishment can be automatically completed, and the service bandwidth adjustment can be performed according to the change of the service traffic and the underlying tunnel granularity.
  • FIG. 1 is a schematic diagram showing a signaling flow of establishing a BoD service according to an embodiment of the present invention
  • FIG. 2 is a flow chart showing the adjustment of bandwidth by the source UNI-N according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a signaling flow for adjusting bandwidth in a BoD service according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of an apparatus for adjusting bandwidth in a BoD service according to an embodiment of the present invention.
  • ASON In the ASON network, the application of data services is more and more, and the data services are characterized by suddenness and unpredictability.
  • the traditional SDH network is designed for circuit services and does not adapt to the characteristics of data services. Therefore, ASON is applied.
  • the network puts forward a new requirement, that is, the ASON network can adjust the network connection bandwidth in real time and dynamically according to the customer service traffic. This service is called BoD service.
  • the data service signal may be first mapped into the SDH frame format by using the GFP technology to implement a general framing process for various services of the optical network.
  • the channel capacity of SDH is discrete, and the rate of accessing data services is continuous and bursty, in order to provide a flexible channel capacity organization in the transmission network, to better
  • virtual concatenation technology can be used to combine multiple virtual containers (VCs) to serve as a single container for maintaining bit sequence integrity, and to realize the transmission of various granular services.
  • the LCAS technology is used to dynamically change the channel capacity of the VCG so as to increase or decrease the number of VC members for the service without affecting the established services, thereby realizing dynamic non-destructive adjustment of the service bandwidth.
  • VC members in VCG are also called Low-order VC.
  • the combination of the above three key technologies of GFP, VC and LCAS and the GMPLS protocol stack of the ASON control plane can realize the establishment, deletion and lossless bandwidth adjustment of the BoD service.
  • the method can be divided into two steps. First, the client establishes a BoD service through the control plane UNI interface, and secondly, the bandwidth is non-destructively adjusted.
  • the BoD service establishment process can be further divided into two major steps.
  • the first step is to establish an underlying tunnel for the client service within the network.
  • the underlying tunnel is represented by a high-order VC or a high-order VC cascade tunnel; the number of tunnels is based on
  • the bandwidth of the customer service is determined by one or more.
  • Each tunnel uses a high-order VC (VC4) or a high-order VC cascade (VC4-nc) as the bandwidth granularity.
  • VC4 high-order VC
  • VC4-nc high-order VC cascade
  • a VCG is configured for each customer service, and in order to ensure that the service is not damaged when the service bandwidth is adjusted, the LCAS function of the VCG needs to be enabled.
  • the second step is: after the establishment of the underlying tunnel is successful, the establishment of the client layer service is initiated, and the client layer service uses the underlying tunnel as the service layer, and the client service is configured to the VCG with the low-order VC (VC12) granularity at the first and last nodes of the tunnel.
  • VC12 low-order VC
  • the BoD service established by this solution satisfies the high-order VC in the network as a tunnel, does not occupy low-order cross resources, and ensures that the customer service bandwidth is at a minimum granularity with a low-order VC, and can perform bandwidth adjustment with a low-order granularity.
  • FIG. 1 is a schematic diagram of a signaling flow for establishing a BoD service according to an embodiment of the present invention.
  • Step 1 The user network interface client (UNI-C) initiates a request for establishing a BoD service according to the current customer service bandwidth requirement, and sends an Ethernet service establishment message to the source user network interface network (UNI-N) through the control plane. Let the message (Path signaling).
  • Step 2 After receiving the client layer Ethernet service establishment request through the UNI interface, the source UNI-N first establishes a service layer SDH VC4 tunnel through the control plane.
  • one or more VC4 tunnels are established according to the bandwidth requirement of the customer. For example, if the customer service bandwidth is 100M, only one VC4 tunnel needs to be established. If the customer service bandwidth is 300M, then two VC4 tunnels are established.
  • the signaling procedures 3, 4, 5, 6, 7, 8, 9, 10 in Figure 1 illustrate the process of establishing two VC4 tunnels. Specifically, the signaling procedures 3, 4, 5, and 6 establish the first An underlying tunnel, after which the signaling process 7, 8, 9, 10 establishes a second underlying tunnel.
  • VC4 tunnels (not shown) can also be created in FIG.
  • high-order intersections are configured at the first and last nodes of the tunnel, and the signaling processes 3a, 3b, 7a, 7b, 4a, 4b, 8a, 8b, 5a, 5b, 9a, 9b in FIG.
  • the process of configuring high-order intersections is out.
  • Step 11 After the underlying tunnel is successfully established, a successful response is returned to the client layer.
  • Step 12-16 The source UNI-N initiates a client layer Ethernet service establishment request, and the Ethernet service of the client layer uses the underlying SDH tunnel as a service layer, and the signaling only passes through the first and last nodes of the tunnel.
  • the VCG configuration command is sent to the Ethernet board at the first and last nodes of the service, and the corresponding VC 12 is configured to the VCG according to the bandwidth of the customer. For example, if the bandwidth of the customer service is 100M, then 50 VC12s are configured to the VCG. If it is 300M, Then 150 VC12s are configured into the VCG, as shown in steps 16a, 14a in FIG.
  • FIG. 2 is a flowchart of adjusting the bandwidth of the source UNI-N according to the embodiment of the present invention
  • FIG. 3 is a flowchart of the embodiment of the present invention. Schematic diagram of the signaling flow for adjusting bandwidth in the BoD service.
  • Step 201 The source UNI-N receives the bandwidth adjustment request message sent by the user network interface client by using the control plane signaling (such as the signaling process 1: Path in FIG. 3), where the bandwidth adjustment request message includes the bandwidth adjustment amount. .
  • the control plane signaling such as the signaling process 1: Path in FIG. 3
  • Step 202 After receiving the service adjustment request message, the source UNI-N node first determines whether the absolute value of the bandwidth adjustment amount is smaller than a VC4 granularity. If the absolute value of the bandwidth adjustment amount is smaller than a VC4 granularity, step 207 is performed, otherwise step 203 is performed. .
  • Step 203 If the absolute value of the bandwidth adjustment amount is greater than or equal to a VC4 granularity, determine whether the bandwidth adjustment amount is an increased bandwidth at the source UNI-N node, and if yes, go to step 205; otherwise, go to step 204.
  • Step 204 If the bandwidth adjustment amount is to reduce the bandwidth, then the underlying VC4 is initiated at the source UNI-N node. The process of deleting the tunnel, and deleting one or more tunnels according to the bandwidth adjustment, so that the total bandwidth of the tunnel meets the bandwidth requirement of the adjusted BoD service, so as to reduce the waste of the bandwidth of the tunnel. For example, the bandwidth adjustment is reduced by one VC4. Then, one VC4 tunnel needs to be deleted, and the bandwidth adjustment is reduced by two VC4s, then the two VC4 tunnels are deleted; then, the message of whether the tunnel is successful is returned, and step 206 is performed.
  • Step 205 If the bandwidth adjustment amount is to increase the bandwidth, the source UNI-N node initiates the establishment process of the underlying VC4 tunnel, and one or more tunnels are established according to the bandwidth adjustment amount, so that the total bandwidth of the tunnel satisfies the adjusted bandwidth of the BoD service. Requirement, for example, if the bandwidth adjustment is increased by one VC4, then one VC4 tunnel needs to be established, and the bandwidth adjustment is increased by two VC4s, then two VC4 tunnels are established; then, the tunnel establishment success message is returned, and steps are performed. 206.
  • Step 206 Determine whether the message returned by the step 204 or 205 is successful. If the operation is successful, go to step 207. Otherwise, go to step 208: BoD service establishment fails, and the failure process is performed.
  • Step 207 The source UNI-N re-initiates the client layer service bandwidth adjustment process, and the client layer signaling is directly sent from the source UNI-N to the destination UNI-N, and the corresponding VC 12 to the VCG is configured at the first and last nodes of the tunnel to adjust the VCG.
  • the number of VC12s meets the requirements of the adjusted bandwidth of the BoD service. For example, if the bandwidth adjustment is increased by 100M, then 50 VC12s are configured to the VCG, and the bandwidth adjustment is increased by 300M, then 150 VC12s are configured to the VCG; The adjustment is reduced by 100M, then 50 VC12 is reduced in VCG, and the bandwidth adjustment is reduced by 300M, then 150 VC12 is reduced in VCG.
  • the signaling process for bandwidth adjustment in this case is shown in Figure 3. The specific process is as follows:
  • step (a) After receiving the bandwidth adjustment request of the client layer Ethernet service through the UNI interface, the source UNI-N initiates a signaling process to adjust the bandwidth directly at the Ethernet client layer, and the destination UNI-N returns the client layer adjustment to the source UNI-N. If the message is successful, step (b) is performed. Otherwise, step 208 is performed: the BoD service fails to be established, and the failure process is performed.
  • the signaling process is as shown in steps 2, 3, 4, 5, and 6 in FIG.
  • Step 209 The BoD service bandwidth is successfully adjusted.
  • the link capacity adjustment function of the bandwidth-on-demand service is enabled when the BoD service is established.
  • the bandwidth capacity adjustment function of the bandwidth allocation service is enabled before the bandwidth is adjusted. Since the LCAS technology is used in the bandwidth adjustment process, the service is not interrupted when the bandwidth is adjusted, that is, the dynamic lossless bandwidth adjustment is realized.
  • the embodiment of the present invention further discloses an apparatus for adjusting bandwidth in a bandwidth on-demand service, including: an enabling unit, configured to enable a link capacity adjustment function of a bandwidth-assigned service; a unit, configured to receive a bandwidth adjustment message sent by the user network interface client to the user network interface network by using control plane signaling, where the bandwidth adjustment message includes a bandwidth adjustment amount; and an adjustment unit, configured to adjust the amount according to the bandwidth and the bottom tunnel Granularity adjustment bandwidth.
  • the adjusting unit specifically includes: a comparing unit, configured to compare whether an absolute value of the bandwidth adjustment amount is smaller than an underlying tunnel granularity, and when the absolute value of the bandwidth adjustment amount is smaller than the underlying tunnel granularity, start the virtual concatenation member number adjusting unit, otherwise, The virtual concatenation member number adjustment unit and the bottom tunnel number adjustment unit are activated; the virtual concatenation member number adjustment unit is configured to adjust the number of virtual concatenation members in the virtual concatenation group; Adjust the number of underlying tunnels.
  • a comparing unit configured to compare whether an absolute value of the bandwidth adjustment amount is smaller than an underlying tunnel granularity, and when the absolute value of the bandwidth adjustment amount is smaller than the underlying tunnel granularity, start the virtual concatenation member number adjusting unit, otherwise, The virtual concatenation member number adjustment unit and the bottom tunnel number adjustment unit are activated; the virtual concatenation member number adjustment unit is configured to adjust the number of virtual concatenation members in the virtual concaten
  • Embodiments of the present invention are also applicable to time division multiplexing circuit networks.
  • the establishment of the BoD service and the non-destructive adjustment of the service bandwidth are realized by combining the GMPLS technology of the control plane and the LCAS, VC and GFP technologies of the transport platform.
  • the VC12 is used to adjust the granularity bandwidth, and does not occupy the low-order cross resources of the device.

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Description

一种在带宽按需分配业务中调整带宽的方法和装置
技术领域 本发明涉及一种网络通信技术， 尤其涉及一种在带宽按需分配 （Bandwidth on demand, BoD ) 业务中调整带宽的方法和装置。 背景技术 光传送网络， 包括同步数字体系 （ Synchronous Digital Hierarchy, SDH )、 同步光网络 ( Synchronous Optical Network , SONET ) 和光传送网 （Optical Transmission Network, OTN ) , 传统上是被设计用于传送话音业务的， 但是数 据业务的快速发展使得其业务流量占现有光网络传送流量的比例不断提高， 为 了适应这种快速的发展趋势， 产生了多业务传输平台 （Multiservice Transport Platform, MSTP )设备， 不但可以接入传统的语音业务， 而且还可以接入数据 业务， 通过通用成帧协议 ( Generic Framing Procedure, GFP ) 、 链路容量调整 功能（ Link Capacity Adjustment Scheme, LCAS )、虚级联（ Virtual Concatenation, VC )等技术将不同速率的数据业务适配到 SDH传送通道中。 同时， 为了满足数 据业务传送网络带宽不断提高， 服务提供时间的要求越来越短的需求， 网络拓 朴需要从传统的以环网为主演进到以格状网为主， 网络连接提供方式要从以静 态供给的永久连接过渡到以基于信令的软永久连接和交换连接为主。 这种新型 的光传送网络被称为 "自动交换光网络（ Automatically switched optical network , ASON ) " , 引入控制平面用于网络连接的建立、 修改和维护， 并在网络故障条 件下实现连接的恢复。 自动交换光网络的信令实现的方式之一是应用 "通用多 协议标签交换协议 ( Generalized Multi-Protocol Label Switching , GMPLS ) " 。
在 ASON网络中， 数据业务的应用也越来越多， 并且数据业务有突发性、 不 可预测性等特点， 而传统的 SDH网络是为电路业务设计， 不适应数据业务的特 点，为了实现数据业务，在现有的 ASON网络中，以太网业务是以软永久连接（ Soft Permanent Co皿 ection, SPC )方式建立， 在以太网业务建立之前， 网管首先要静 态配置虚级联组（ Virtual Concatenation Group , VCG )， 将以太网板的以太网端 口与相应的 VCG进行映射， 在收到以太网业务建立请求后， 网管首先发起 SPC 建立， 在以太网业务的源和目的节点之间根据以太网业务的带宽需求建立 SDH 通道， 之后再通过网管配置将已建 SDH通道中的虚容器（ Virtual Container, VC ) 添加到相应的 VCG中， 这样就建立了 SPC方式的以太网业务。
然而， 在上述的以太网业务中， SDH通道由网管发起控制平面完成建立， 以太网客户层连接完全由网管配置完成， 控制平面没有客户层业务信息， 整个 过程中主要由网管控制， 不支持交换连接 ( Switched Connection， SC )方式建立 以太网业务， 不支持通过用户网络接口 （ User Network Interface， UNI ) 完成业 务带宽调整， 即， 客户不能根据业务流量的变化情况发起带宽的调整。 发明内容
本发明的实施例是提供一种在带宽按需分配业务中调整带宽的方法和装 置， 可根据业务流量的变化进行带宽调整。
一方面， 本发明的实施例提供了一种在带宽按需分配业务中调整带宽的方 法， 包括：
用户网络接口客户端 UNI-C通过控制平面信令向用户网络接口网络端 UNI-N发送基于带宽按需分配业务的带宽调整消息，所述带宽调整消息包括带宽 调整量；
所述用户网络接口网络端根据所述带宽调整量和底层隧道粒度调整带宽。 本发明的实施例还提供了一种在带宽按需分配业务中调整带宽的装置， 该 装置位于用户网络接口网络端， 所述装置包括接收单元和调整单元：
所述接收单元， 用于接收来自于用户网络接口客户端通过控制平面信令发 送的基于带宽按需分配业务的带宽调整消息， 所述的带宽调整消息包括带宽调 整量；
所述调整单元， 用于根据所述带宽调整量和底层隧道粒度调整带宽。 根据本发明实施例 , 不但可自动完成 BoD业务建立， 并且可以根据业务流量 的变化情况和底层隧道粒度进行业务带宽调整。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部分， 并不构成对本发明的限定。 在附图中：
图 1示出了本发明实施例的建立 BoD业务的信令流程示意图；
图 2示出了本发明实施例的源 UNI-N进行调整带宽的流程图；
图 3示出了本发明实施例的在 BoD业务中调整带宽的信令流程示意图； 图 4示出了本发明实施例的在 BoD业务中调整带宽的装置结构示意图。 具体实施方式 为了便于本领域一般技术人员理解和实现本发明， 现结合附图描绘本发明 的实施例。 在此， 本发明的示意性实施例及其说明用于解释本发明， 但并不作 为对本发明的限定。
在 ASON网络中， 数据业务的应用越来越多， 并且数据业务有突发性、 不可 预测性等特点， 而传统的 SDH网络是为电路业务设计的， 不适应数据业务的特 点， 因此对 ASON网络提出了新的需求， 即对 ASON网络能够按客户业务流量对 网络连接带宽进行实时、 动态的调整， 这种业务称作 BoD业务。
为了实现 BoD业务，可首先利用 GFP技术将数据业务信号映射到 SDH帧格式 中， 以实现对接入光网络的各种业务的通用成帧过程。 其次， 由于 SDH的通道 容量是离散的， 而接入的数据业务的速率是连续的， 并且具有突发性的特点， 为了在传输网中提供一种灵活的通道容量的组织方式， 以更好的满足数据业务 的传输特点， 可以利用虚级联技术将多个虚容器 （VC )组合起来， 作为一个保 持比特序列完整性的单容器使用， 实现各种颗粒业务的传输。 再者， 利用 LCAS 技术动态改变 VCG中通道容量， 以便在不影响已建业务的前提下为该业务增加 或减少 VC成员的数目，从而实现业务带宽的动态无损调整， VCG中 VC成员也称 低阶 VC。 上述 GFP、 VC和 LCAS三种关键技术和 ASON控制平面的 GMPLS协议 栈的结合， 可以实现 BoD业务的建立、 删除和无损的带宽调整。
在实现本发明实施例的 BoD业务过程中， 可分为两个步骤， 首先是客户通 过控制平面 UNI接口建立 BoD业务， 其次对其带宽进行无损的调整。
BoD业务建立过程又可分为两大步骤， 第一步骤是， 为客户业务在网络内 部建立底层隧道， 例如， 底层隧道表现为高阶 VC或者高阶 VC级联的隧道； 隧道 的个数根据客户业务的带宽确定， 可以是一条或者多条， 每条隧道以高阶 VC ( VC4 )或者高阶 VC级联（VC4-nc ) 为带宽粒度。 并且， 为每个客户业务配置 一个 VCG, 同时为了保证在业务带宽调整的时候业务无损伤， 还需要使能 VCG 的 LCAS功能。 第二步骤是， 在底层隧道建立成功之后， 再发起客户层业务的建 立， 客户层业务以底层隧道为服务层， 在隧道的首末节点将客户业务以低阶 VC ( VC12 )粒度配置到 VCG中。 这种方案建立的 BoD业务即满足网络内部以高阶 VC为隧道， 不占用低阶交叉资源， 又保证客户业务带宽以低阶 VC为最小粒度， 并且能以低阶粒度进行带宽调整。
在 BoD业务调整过程中， 首先根据新的带宽需求确定是否增加或删除相应 的高阶 VC隧道， 之后调整客户业务 VCG中低阶 VC的个数满足实际带宽的需求， 在调整过程中因为有 LCAS功能的保证， 业务不会发生瞬断。
下面描述本发明实施例的以太网中 B oD业务的建立过程。
在建立 BoD业务过程中， 首先配置需要建立 BoD业务的以太网板的 LCAS功 能使能， 以保证在带宽调整的时候业务无损伤。 其次为以太网板的每个客户业 务分配一个 VCG。 下面结合图 1描述以太网中 BoD业务建立的过程， 图 1为本发 明实施例的建立 BoD业务的信令流程示意图。
步骤 1、 用户网络接口客户端 （UNI-C )根据当前客户业务带宽的需求， 发 起 BoD业务建立的请求， 并通过控制平面向源用户网络接口网络端（UNI-N )发 出以太网业务建立信令消息 （Path信令） 。
步骤 2、 源 UNI-N通过 UNI接口收到客户层以太网业务建立请求后， 首先通 过控制平面驱动服务层 SDH VC4隧道建立。 步骤 3-10、根据客户业务带宽需求建立一个或多个 VC4隧道， 例如客户业务 带宽 100M， 那么只需要建立一个 VC4隧道， 如果客户业务带宽为 300M, 那么就 建立 2个 VC4隧道。 图 1中的信令过程 3、 4、 5、 6、 7、 8、 9、 10示出了建立二个 VC4隧道的过程， 具体而言， 信令过程 3、 4、 5、 6建立了第一条底层隧道， 之后 信令过程 7、 8、 9、 10建立了第二条底层隧道。在图 1中也可建立多条 VC4隧道（未 示出） 。 在建立 VC4过程中， 在隧道的首末节点和中间节点配置高阶交叉， 图 1 中信令过程 3a、 3b、 7a、 7b、 4a、 4b、 8a、 8b、 5a、 5b、 9a、 9b示出了配置高阶 交叉的过程。
步骤 11、 底层隧道建立成功之后， 向客户层返回成功应答。
步骤 12-16、 源 UNI-N发起客户层以太网业务建立请求， 客户层的以太网业 务以底层的 SDH隧道为服务层， 信令只经过隧道首末节点。 在业务的首末节点 向以太网板下发 VCG配置命令， 根据客户业务带宽配置相应的 VC 12到 VCG中， 例如客户业务带宽如果是 100M， 那么配置 50个 VC12到 VCG中， 如果是 300M, 那么配置 150个 VC12到 VCG中， 如图 1中的步骤 16a、 14a所示。
下面参照图 2和图 3描述本发明实施例的以太网中 BoD业务的调整带宽的过 程， 图 2为本发明实施例的源 UNI-N进行调整带宽的流程图， 图 3为本发明实施例 的在 BoD业务中调整带宽的信令流程示意图。
步骤 201、 源 UNI-N通过控制平面信令收到用户网络接口客户端发出的带宽 调整请求消息（如图 3中的信令过程 1 : Path ) , 所述的带宽调整请求消息包含带 宽调整量。
步骤 202、 源 UNI-N节点收到业务调整请求消息后， 首先判断带宽调整量的 绝对值是否小于一个 VC4粒度， 如果带宽调整量的绝对值小于一个 VC4粒度， 执 行步骤 207， 否则执行步骤 203。
步骤 203、 如果带宽调整量的绝对值大于等于一个 VC4粒度， 那么就要在源 UNI-N节点判断带宽调整量是否为增加带宽， 若是， 执行步骤 205， 否则， 执行 步驟 204。
步骤 204、 如果带宽调整量为减少带宽， 那么在源 UNI-N节点发起底层 VC4 隧道的删除过程， 并且根据带宽调整量删除一条或多条隧道， 使隧道的总带宽 满足调整后的 BoD业务带宽需求， 以减少隧道带宽资源的浪费， 例如， 带宽调整 量为减少 1个 VC4, 那么需要删除 1个 VC4隧道， 带宽调整量为减少 2个 VC4, 那 么就删除 2个 VC4隧道； 接着， 返回删除隧道是否成功消息， 并执行步驟 206。
步骤 205、 如果带宽调整量为增加带宽， 那么在源 UNI-N节点发起底层 VC4 隧道的建立过程， 并且根据带宽调整量建立一条或多条隧道， 使隧道的总带宽 满足调整后的 BoD业务带宽需求， 例如， 带宽调整量为增加 1个 VC4, 那么需要 建立 1个 VC4隧道， 带宽调整量为增加 2个 VC4, 那么就建立 2个 VC4隧道； 接着， 返回建立隧道是否成功消息， 并执行步骤 206。
步骤 206、 判断步骤 204或 205返回的消息中是否为操作成功， 若操作成功， 则执行步骤 207， 否则， 执行步骤 208: BoD业务建立失败， 进行失败处理。
步骤 207、 源 UNI-N再发起客户层业务带宽调整过程， 客户层信令直接从源 UNI-N发送到目的 UNI-N， 在隧道首末节点配置相应的 VC 12到 VCG中， 以调整 VCG中 VC12的个数， 满足调整后 BoD业务带宽的需求， 例如， 带宽调整量为增 加 100M, 那么配置 50个 VC12到 VCG中， 带宽调整量为增加 300M, 那么配置 150 个 VC12到 VCG中； 带宽调整量为减少 100M, 那么在 VCG中减少 50个 VC12， 带 宽调整量为减少 300M, 那么在 VCG中减少 150个 VC12。 这种情况下的带宽调整 的信令流程如图 3所示， 具体过程如下：
( a ) 源 UNI-N通过 UNI接口收到客户层以太网业务的带宽调整请求后， 直 接在以太网客户层发起信令过程进行带宽调整， 目的 UNI-N向源 UNI-N返回客户 层调整是否成功消息， 若成功， 则执行步骤（b ) , 否则， 执行步骤 208: BoD 业务建立失败， 进行失败处理， 信令过程如图 3中的步驟 2、 3、 4、 5、 6所示。
( b )在底层隧道的首末节点向以太网板下发命令， 根据调整后的带宽增加 或者减少此以太网业务所属 VCG中低阶 VC的个数， 如图 3中的步骤 2a、 3a。
步驟 209、 BoD业务带宽调整成功。
应该注意到， 在上述 BoD业务中调整带宽的流程中，是在建立 BoD业务时已 经使能带宽按需分配业务的链路容量调整功能。事实上， 为了在 BoD业务中调整 带宽， 只要在调整带宽之前使能带宽按需分配业务的链路容量调整功能即可。 由于在带宽调整过程中使用了 LCAS技术， 使得在调整带宽时不会造成业务中 断， 即实现了动态无损带宽的调整。
如图 4所示， 本发明实施例还公开了一种在带宽按需分配业务中调整带宽的 装置， 包括： 使能单元， 用于使能带宽按需分配业务的链路容量调整功能； 接 收单元， 用于接收用户网络接口客户端通过控制平面信令向用户网络接口网络 端发出的带宽调整消息， 所述的带宽调整消息包括带宽调整量； 调整单元， 用 于根据带宽调整量和底层隧道粒度调整带宽。 所述调整单元具体包括： 比较单 元， 用于比较带宽调整量的绝对值是否小于底层隧道粒度， 当带宽调整量的绝 对值小于底层隧道粒度时， 启动虚级联成员个数调整单元， 否则， 启动虚级联 成员个数调整单元和底层隧道个数调整单元； 虚级联成员个数调整单元， 用于 调整虛级联组中虚级联成员的个数； 底层隧道个数调整单元， 用于调整底层隧 道个数。关于调整单元的工作原理可参见"以太网中 BoD业务的调整带宽的过程" 部分。
本发明实施例还适用于时分复用电路网络。
根据本发明实施例 , 通过将控制平面的 GMPLS技术和传送平台的 LCAS、 VC和 GFP技术结合， 实现对 BoD业务的建立和业务带宽的无损调整。 另外， 业 务带宽的调整过程中， 通过建立、 删除底层隧道和增加、 减少 VCG中 VC的个数 相结合， 实现以 VC12为粒度带宽调整， 并且不占用设备的低阶交叉资源。
虽然通过实施例描绘了本发明， 但本领域普通技术人员知道， 在不脱离本 发明的精神和实质的情况下， 就可使本发明有许多变形和变化， 本发明的范围 由所附的权利要求来限定。

Claims

权利要求
1、 一种在带宽按需分配业务中调整带宽的方法， 其特征在于， 包括： 用户网络接口客户端通过控制平面信令向用户网络接口网络端发送基于带 宽按需分配业务的带宽调整消息， 所述带宽调整消息包括带宽调整量；
所述用户网络接口网络端根据所述带宽调整量和底层隧道粒度调整带宽。
2、 根据权利要求 1所述的方法， 其特征在于， 所述带宽按需分配业务对应 一个虚级联组。
3、 根据权利要求 2所述的方法， 其特征在于， 所述用户网络接口网絡端根 据所述带宽调整量和底层隧道粒度调整带宽的步骤具体包括：
当带宽调整量的绝对值小于底层隧道粒度时， 所述用户网络接口网络端调 整虚级联组中虚级联成员的个数；
当带宽调整量的绝对值大于等于底层隧道粒度时， 所述用户网络接口网絡 端调整底层隧道个数和虚级联组中虚级联成员的个数。
4、 根据权利要求 3所述的方法， 其特征在于， 所述调整虚级联组中虚级联 成员的个数的步骤具体包括：
当带宽调整量为增加带宽时， 用户网络接口网络端 居带宽调整量增加虚 级联组中虚级联成员的个数；
当带宽调整量为减少带宽时， 用户网络接口网络端根据带宽调整量减少虚 级联组中虚级联成员的个数。
5、 根据权利要求 3所述的方法， 其特征在于， 所述调整底层隧道个数的步 骤具体包括：
当带宽调整量为增加带宽时， 用户网络接口网络端根据带宽调整量建立底 层隧道；
当带宽调整量为减少带宽时， 用户网络接口网络端根据带宽调整量删除底 层隧道。
6、 根据权利要求 1所述的方法， 其特征在于， 所述的方法还包括： 在所述 用户网络接口客户端通过控制平面信令向所述用户网络接口网络端发出调整带 宽消息之前， 建立所述带宽按需分配业务。
7、 根据权利要求 6所述的方法， 其特征在于， 建立所述带宽按需分配业务 的步骤具体包括：
为所述带宽按需分配业务对应分配一个虚级联组；
使能所述虚级联组的链路容量调整功能；
建立底层隧道；
在所述底层隧道的首节点和末节点上分别配置虚级联成员到所述虚级联组 中。
8、 根据权利要求 7所述的方法， 其特征在于， 所述建立底层隧道的步骤具 体包括：
所述用户网络接口客户端发起建立带宽按需调整业务请求， 所述建立带宽 按需分配业务请求包括业务所需带宽量；
通过控制平面按照业务所需带宽量驱动底层隧道的建立。
9、 根据权利要求 2所述的方法， 其特征在于， 所述方法还包括： 在所述用 户网络接口客户端通过控制平面信令向所述用户网络接口网络端发出调整带宽 消息之前， 使能所述虚级联组的链路容量调整功能。
10、 一种在带宽按需分配业务中调整带宽的装置， 其特征在于， 该装置位 于用户网络接口网络端， 所述装置包括接收单元和调整单元：
所述接收单元， 用于接收来自于用户网络接口客户端通过控制平面信令发 送的基于带宽按需分配业务的带宽调整消息， 所述的带宽调整消息包括带宽调 整量；
所述调整单元， 用于 居所述带宽调整量和底层隧道粒度调整带宽。
1 1、 根据权利要求 10所述的装置， 其特征在于， 所述带宽按需分配业务对 应一个虛级联组， 所述装置还包括：
使能单元， 用于使能所述虚级联组的链路容量调整功能。
12、 根据权利要求 10或 11所述的装置， 其特征在于， 所述带宽按需分配业 务对应一个虛级联组， 所述调整单元具体包括： 比较单元、 虚级联成员个数调 整单元及底层隧道个数调整单元，
所述比较单元， 用于比较带宽调整量的绝对值是否小于底层隧道粒度， 当 带宽调整量的绝对值小于底层隧道粒度时， 启动所述虚级联成员个数调整单元； 否则， 启动所述虚级联成员个数调整单元和所述底层隧道个数调整单元；
所述虚级联成员个数调整单元， 用于调整所述虚级联组中虚级联成员的个 数；
所述底层隧道个数调整单元， 用于调整底层隧道个数。
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EP2037626A1 (en) 2009-03-18
EP2037626A4 (en) 2013-09-18

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