WO2012130106A1 - 一种控制平面带宽调整处理方法及系统 - Google Patents

一种控制平面带宽调整处理方法及系统 Download PDF

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Publication number
WO2012130106A1
WO2012130106A1 PCT/CN2012/072946 CN2012072946W WO2012130106A1 WO 2012130106 A1 WO2012130106 A1 WO 2012130106A1 CN 2012072946 W CN2012072946 W CN 2012072946W WO 2012130106 A1 WO2012130106 A1 WO 2012130106A1
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node
lsp
bandwidth adjustment
bandwidth
information
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PCT/CN2012/072946
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English (en)
French (fr)
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鲍远林
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中兴通讯股份有限公司
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Publication of WO2012130106A1 publication Critical patent/WO2012130106A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic control in data switching networks
    • H04L47/70Admission control; Resource allocation
    • H04L47/76Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions
    • H04L47/762Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions triggered by the network

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a method and system for processing lossless adjustment of control plane bandwidth in an OTN (Optical Transport Network).
  • OTN Optical Transport Network
  • ITU-T proposes a flexible transport container ODUflex (flexible rate optical digital unit) concept, enabling OTN to efficiently carry full service including IP and maximize line bandwidth utilization.
  • the ITU-T defines two forms of ODUflex: an ODUflex for a Constant Bit Rate (CBR) service, the rate can be arbitrary, and the CBR service is encapsulated into the ODUflex by synchronous mapping; One is based on the ODUflex of the packet service.
  • the rate of the ODUflex is N times that of the HO ODU (High Order Optical Data Unit) slot, and the packet service is encapsulated by the GFP (Generic Framing Procedure).
  • ODUflex denoted ODUflex (GFP).
  • ODUflex For ODUflex (GFP), since the bandwidth of the packet client signal varies with time, assigning a fixed bandwidth to ODUflex (GFP) is not conducive to the efficient use of bandwidth resources. If ODUflex (GFP) can support dynamic bandwidth adjustment, it can not only better meet the multiple bandwidth requirements of packet client signals, but also effectively improve bandwidth utilization and save bandwidth resources. To this end, ODUflex (GFP) requires the ability to adjust bandwidth without loss. ODUflex (GFP) lossless adjustment means that ODUflex (GFP) needs to adjust the bandwidth dynamically and without interrupting existing services.
  • ITU-T proposes a G.HAO ( Hitless Adjustment of ODUflex (GFP)) for lossless bandwidth adjustment, which completes the lossless bandwidth of ODUflex through two phases: link connection adjustment (LCR) and bandwidth adjustment (BWR). Adjustment.
  • G.HAO Hitless Adjustment of ODUflex
  • the protocol stack in which the signaling uses the RSVP-TE (Resource Reservation Protocol-Traffic Engineering) protocol.
  • RSVP-TE Resource Reservation Protocol-Traffic Engineering
  • the adjustment failure may occur during the bandwidth adjustment process.
  • control plane processing mechanism for the failure adjustment there is no corresponding control plane processing mechanism for the failure adjustment.
  • the technical problem to be solved by the present invention is to provide a control plane bandwidth adjustment processing method, which can improve the success rate of bandwidth adjustment.
  • control plane bandwidth adjustment processing method including:
  • the first node of the label switched path (LSP) carries the bandwidth and time slot to be adjusted in the signaling message, and the re-signaling identifier;
  • the node other than the first node on the LSP After receiving the signaling message carrying the re-signaling identifier, the node other than the first node on the LSP determines that the adjusted bandwidth does not match the adjusted time slot, and then sends the information to the first node of the LSP. a bandwidth adjustment failure message, and carrying the number of times slot information in the bandwidth adjustment failure message; after receiving the bandwidth adjustment failure message, the first node re-bandwidth adjustment according to the number of timeslot information, or cancel bandwidth adjustment operating.
  • the node other than the head node on the LSP is an ingress node of the ODU network through which the LSP passes.
  • the number of slots information is the number of slots that need to be increased or decreased in the ODU network where the nodes other than the head node are located on the LSP.
  • the LSP head node presets a retry limiting condition; after receiving the bandwidth adjustment failure message, the LSP head node determines that if the retry limiting condition is met, the bandwidth adjustment is performed according to the slot number information.
  • the retry limit condition is the number of retries or the retry time.
  • the head node places the re-signaling identifier in an LSP attribute object of the signaling message.
  • the node other than the first node on the LSP carries the number of times slot information in the bandwidth adjustment failure message in the following manner: placing the number of times slot information in an error information object (ERROR_SPEC) Carry in TL V.
  • ERP error information object
  • the bandwidth adjustment failure message sent by the node to the first node of the LSP further carries error information for indicating the cause of the error.
  • the error information is carried in an ERROR-SPEC object.
  • control plane bandwidth adjustment processing system including:
  • the first device is located at the first node of the LSP, and is configured to: carry the bandwidth and the number of slots to be adjusted, and the re-signaling identifier in the signaling message;
  • the second device the node other than the first node located on the LSP, is configured to: after receiving the signaling message carrying the re-signaling identifier, determine that if the adjusted bandwidth does not match the adjusted time slot, Sending a bandwidth adjustment failure message to the first node of the LSP, and carrying the number of times slot information in the bandwidth adjustment failure message;
  • the third device is located at the first node of the LSP, and is configured to: after receiving the bandwidth adjustment failure message, perform bandwidth adjustment again according to the number of timeslot information, or cancel the bandwidth adjustment operation.
  • the node other than the head node on the LSP where the second device is located is: an ingress node of the ODU network through which the LSP passes.
  • the number of slots information is the number of slots that need to be increased or decreased in the ODU network where the nodes other than the head node are located on the LSP.
  • the third device is further configured to: preset a retry limiting condition; and after receiving the bandwidth adjustment failure message, determine, if the retry limiting condition is met, re-bandwidth according to the slot number information Adjustment.
  • the retry limit condition is the number of retries or the retry time.
  • the first device is configured to: carry the re-signaling identifier in the following manner:
  • the re-signaling identifier is placed in an LSP attribute object of the signaling message.
  • the second device is configured to: carry the number of slots in the bandwidth adjustment failure message in the following manner: the TLV in which the number of slots message is placed in an error information object (ERROR_SPEC) Carrying in.
  • ERP error information object
  • the second device is further configured to: carry the error information indicating the cause of the error in the bandwidth adjustment failure message sent to the LSP head node.
  • the second device is further configured to: carry the error information in the following manner: The error information is carried in an ERROR-SPEC object.
  • control plane is extended to ensure that the control plane fails to adjust the bandwidth of the ODUflex (GFP) connection, and the success of the bandwidth adjustment is ensured by the negotiation of the slot number information, thereby improving the success rate of the bandwidth adjustment. It does not affect the customer's business.
  • GFP ODUflex
  • Figure 1 is a signaling flow chart of bandwidth modulation
  • Figure 2 is a schematic diagram of a network structure supporting G.HAO. Preferred embodiment of the invention
  • the method in this embodiment is applicable to a process in which a node on an LSP (Label Switched Path) performs a bandwidth adjustment operation:
  • the first node of the LSP carries the bandwidth and the number of slots to be adjusted in the signaling message, and the re-signaling identifier.
  • the re-signaling identifier is used to indicate that other nodes on the LSP except the first node are determined after the adjustment. Notifying the first node of the number of slots when the bandwidth does not match the adjusted time slot;
  • the node other than the first node on the LSP determines that the bandwidth adjustment failure message is sent to the first node of the LSP if the adjusted bandwidth does not match the adjusted time slot. And carrying the number of timeslot information in the bandwidth adjustment failure message;
  • the first node After receiving the bandwidth adjustment failure message, the first node re-bandifies the bandwidth according to the number of timeslot information, or cancels the bandwidth adjustment operation.
  • the node other than the first node on the LSP that is determined above is usually the ingress node of the ODU network through which the LSP passes, because usually the ingress node knows the time slot and bandwidth of the ODU network in which it is located. happening.
  • the number of timeslots carried by the node in the bandwidth adjustment failure message is preferably the number of timeslots that the node is located in which the network needs to be increased or decreased.
  • the sum of the current number of slots and the number of slots to be increased or decreased may be directly carried, but the application is limited to the case where the LSP passes through two ODU networks.
  • the node may carry information such as the cause of the adjustment failure.
  • the LSP head node may preset a retry limit condition, for example, the number of retries or the retry time (which may be timed by a timer). After receiving the bandwidth adjustment failure message, the LSP first node determines whether the retry limit is met. Condition, if it is satisfied, for example, the number of retries is not reached or the retry time is not reached, the bandwidth adjustment is performed according to the number of timeslot information, and if it is not satisfied, for example, the number of retries has been reached or the retry time has been reached, the bandwidth is cancelled. Adjust the operation. In other embodiments, the LSP may also not set the retry qualification condition, and the default is only to retry once, or the retry is not performed, and the bandwidth adjustment operation is directly cancelled.
  • a retry limit condition for example, the number of retries or the retry time (which may be timed by a timer).
  • the first node carries a re-signaling identifier in the ODUflex (GFP) connection signaling sent to the downstream node during the bandwidth adjustment operation, and is used to indicate that the downstream node determines the adjusted bandwidth and adjustment.
  • GTP ODUflex
  • the existing RSVP-TE signaling can be extended to accomplish this function:
  • the LSP-ATTRIBUTES (LSP attribute) object is extended, for example, in the LSP Attributes TLV (Type Lenth Value, type length value) of the LSP_ATTRIBUTES object
  • the 5th bit is defined as a bit indicating the re-signaling identity. When the bit is set to 1, it indicates that when the intermediate node fails to match the bandwidth adjustment and the adjusted bandwidth does not match the adjusted time slot, the number of timeslot information needs to be reported to the first node.
  • the function of reporting the number of timeslots by the intermediate node is implemented by extending the existing RSVP-TE signaling as follows:
  • the error information object (ERROR_SPEC) is extended to define a new number of slots TLV, which is used to carry the number of slots.
  • the intermediate node uses the TLV to report the required number of slots to the head node.
  • the first node After receiving the number of slots, the first node re-initiates the adjustment signaling according to the number of slots indicated in the TLV.
  • Error Code 50 indicates that the connection adjustment failed
  • system for implementing the above method includes:
  • a first device located at a first node of the LSP, configured to carry, in the signaling message, a bandwidth and a number of timeslots to be adjusted, and a re-signaling identifier;
  • a second device where the node other than the first node is located on the LSP, after receiving the signaling message carrying the re-signaling identifier, determining that if the adjusted bandwidth does not match the adjusted time slot, Sending a bandwidth adjustment failure message to the first node of the LSP, and carrying the number of times slot information in the bandwidth adjustment failure message;
  • the third device is located at a first node of the LSP, and is configured to re-bandwidth adjustment or cancel the bandwidth adjustment operation according to the number of timeslot information after receiving the bandwidth adjustment failure message.
  • the first device carries the re-signaling identifier in the following manner:
  • the re-signaling identifier is placed in an LSP attribute object of the signaling message.
  • the node other than the head node on the LSP where the second device is located is: an ingress node of the ODU network through which the LSP passes.
  • the number of slots information is the number of slots that need to be increased or decreased in the ODU network where the nodes other than the first node on the LSP are located.
  • the second device carries the number of slots information in the bandwidth adjustment failure message in the following manner:
  • the time slot number message is carried in a TLV in an error information object (ERROR_SPEC).
  • the second device is further configured to carry error information indicating a cause of the error in the bandwidth adjustment failure message sent to the LSP head node.
  • the error message can be carried in the following manner:
  • the error information is carried in an ERROR-SPEC object.
  • the third device is further configured to preset a retry limiting condition; and, after receiving the bandwidth adjustment failure message, determining, if the retry limiting condition is met, re-bandrating the bandwidth according to the slot number information Adjustment.
  • the retry qualification condition is the number of retries or the retry time.
  • Step 201 The service first node receives the connection bandwidth adjustment request, and sets a maximum number of retries; the request is triggered by the management plane.
  • Step 202 Determine whether the current number of retries is less than the maximum number of retries. If yes, go to step 203, otherwise go to step 211;
  • Step 203 The first node sends the bandwidth adjustment signaling, for example, by using a Path message, where the re-signaling identifier and the bandwidth and the number of slots to be adjusted are carried.
  • the number of slots here may be the number of slots that need to be adjusted by the initial setting of the first node, or the number of slots that are reset after the first node receives the number of slots fed back by the intermediate node.
  • Step 204 When an intermediate node receives the bandwidth adjustment signaling, check whether the parameter in the signaling message is legal (the existing legality check). If it is legal, go to step 205. If it is not legal, the process ends.
  • Step 205 it is determined whether the adjusted number of time slots meets the requirements, that is, whether the adjusted bandwidth is satisfied, if yes, step 210 is performed, if not, step 206 is performed;
  • Step 206 The intermediate node fills the PathErr (Path Error) message with the correct number of timeslot information (for example, the number of slots that need to be increased or decreased for the ODU where the intermediate node is located) and sends the PathErr message.
  • PathErr Pulth Error
  • the correct number of timeslot information for example, the number of slots that need to be increased or decreased for the ODU where the intermediate node is located
  • Step 207 After receiving the PathErr message, the service head node adds 1 to the current retries.
  • Step 209 The service head node checks the maximum number of retries. , performing step 202;
  • Step 210 Perform bandwidth adjustment, and send the bandwidth adjustment signaling to the downstream node. After the bandwidth adjustment of all the downstream nodes succeeds, the process ends.
  • the downstream node in the ODU network is controlled to adjust the band according to the signaling requirement. Wide, and forward the bandwidth adjustment signaling to the ingress node of the next ODU network.
  • Step 211 cancel signaling, bandwidth adjustment fails, and the process ends.
  • the processing when a failure occurs in the process of increasing the bandwidth between the node A and the node Z will be described with reference to FIG. 1 and FIG. As shown in Figure 2, it is assumed that an ODUflex one-way connection with a bandwidth of 35G exists between A and Z as Conl. The connection occupies 27 time slots in both the ODU1 network and the ODU2 network. Now, due to business needs, it is necessary to increase the bandwidth of 2.5G (that is, the increased bandwidth is 37.5G); and assume that two slots are added to the ODU1 network, and three slots are added to the ODU2 network to satisfy the G.HAO protocol. Requirements.
  • the control surface processing process includes the following steps:
  • Step 301 Node A receives a request for adding 2.5G bandwidth to the Conl connection.
  • Step 302 the control plane of the node A constructs a PATH message in the RSVP-TE signaling, and sends a PATH message to the node B.
  • Node A sets the corresponding object as follows:
  • Step 303 After receiving the PATH message, the control plane of the Node B parses the NMC field and the service bandwidth field, and compares with the current service time slot 27 to learn that two time slot resources need to be added.
  • Step 304 the node B forwards the above PATH message to the node C; the node C further forwards to the node D;
  • Step 305 After receiving the PATH message, the control plane of the node D, after parsing the NMC field and the service bandwidth field, knows that it needs to add 2.5G bandwidth to the connection, but contradicts the value 29 of the NMC field, because 2.5G Bandwidth requires 3 slot resources in the ODU3 network; Step 306, the node D fails to connect the adjustment signaling due to the contradiction, and reports the bandwidth adjustment failure information to the node A through the PathErr message, where the PathErr message is set as follows:
  • Step 307 After receiving the PathErr message of the node D, the node A checks the number of retries. Since the number of retries is less than 3, the adjustment signaling PATH message is resent, at which point node A sets the NMC field to 30.
  • the downstream node After the retry, the downstream node successfully completes the connection bandwidth increase.
  • Step 401 Node A receives a request to reduce the bandwidth of 35G for the Conl connection;
  • Step 402 the control plane of the node A constructs a PATH message in the RSVP-TE signaling, and sends a PATH message to the node B.
  • Node A sets the corresponding object as follows:
  • LSP The LSP Attributes TLV re-signaling bit (bit 5) in the ATTRIBUTES object is set to 1; the value of the service bandwidth field in the Traffic Parameters in the SENDER_TSPEC object is set to 2.5G; the NMC field is set to 3 .
  • Step 403 After receiving the PATH message, the control plane of the node B parses out the NMC field and the service bandwidth field, and compares with the previous service time slot 30 to learn that it is necessary to reduce 27 time slot resources.
  • Step 404 the node B forwards the PATH message to the node C; the node C further forwards to the node D;
  • Step 405 After receiving the PATH message, the control plane of the node D, after parsing out the NMC field and the service bandwidth field, knows that the 35G bandwidth needs to be reduced for the connection, but contradicts the value 3 of the NMC field, because the bandwidth of the 35G is 28 slot resources are required in the ODU3 network;
  • Step 406 The node D fails to connect the adjustment signaling due to the contradiction, and the bandwidth adjustment failure information is reported to the node A by using the PathErr message, where the PathErr message is set as follows:
  • Error Code is set to 50; Error Value is set to 1; Number of slots is set to 2 in TLV.
  • Step 407 after receiving the PathErr message of the node D, the node A checks the number of retries. Since the number of retries is less than 2, the adjustment signaling PATH message is resent, and node A sets the NMC field to 2.
  • the downstream node After retrying, the downstream node successfully completes the connection bandwidth reduction.
  • the control plane by extending the control plane signaling, the control plane fails to adjust the bandwidth of the ODUflex (GFP) connection, and the bandwidth adjustment is ensured by the negotiation of the slot number information, thereby improving the bandwidth adjustment. Success rate does not affect the customer's business.
  • GFP ODUflex

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Abstract

控制平面带宽调整处理方法,可以提高带宽调整的成功率。所述方法包括:LSP的首节点在信令消息中携带需要调整的带宽和时隙数,以及重信令标识;所述LSP上的除首节点之外的节点接收到携带有重信令标识的信令消息后,判断如果调整后的带宽与调整后的时隙不匹配,则向所述LSP的首节点发送带宽调整失败消息,并在所述带宽调整失败消息中携带时隙数信息;所述首节点接收到所述带宽调整失败消息后,根据所述时隙数信息重新进行带宽调整,或取消带宽调整操作。本发明使控制平面在ODUflex(GFP)连接带宽调整失败的情况下,通过时隙数信息的协商,保证带宽调整的成功,提高带宽调整的成功率,且不会影响客户的业务。

Description

一种控制平面带宽调整处理方法及系统
技术领域
本发明涉及移动通信领域,具体涉及在 OTN ( Optical Transport Network, 光传送网络) 中, 控制平面带宽无损调整的处理方法及系统。
背景技术
为了实现 OTN全业务承载, ITU-T提出了灵活的传送容器 ODUflex (灵 活速率光数字单元 )概念, 使得 OTN能够高效地承载包括 IP在内的全业务, 并最大限度提高线路带宽利用率。 目前 ITU-T定义了两种形式的 ODUflex: 一种^ ^于固定比特速率( Constant Bit Rate , 简称 CBR )业务的 ODUflex, 速率可以是任意的, CBR业务通过同步映射封装到这种 ODUflex; 另一种是 基于分组业务的 ODUflex, 这种 ODUflex 的速率为 HO ODU ( High Order Optical Data Unit, 高阶光数据单元)时隙的 N倍, 包业务通过 GFP ( Generic Framing Procedure, 通用成帧规程)封装到 ODUflex, 记作 ODUflex(GFP)。
对于 ODUflex(GFP)来说, 由于分组客户信号的带宽是会随时间变化的, 所以为 ODUflex(GFP)分配固定带宽不利于带宽资源的有效利用。 如果 ODUflex(GFP)能够支持动态的带宽调整, 那么不但可以更好地满足分组客户 信号的多种带宽要求, 而且能有效地提高带宽利用率并节约带宽资源。 为此, ODUflex(GFP)就需要具备无损地调整带宽的能力。 ODUflex(GFP)无损调整意 味着 ODUflex(GFP)需要在动态且不中断现有业务的情况下完成带宽的调整。 为此, ITU-T提出了关于无损带宽调整的建议 G.HAO ( Hitless Adjustment of ODUflex (GFP) ) , 通过链路连接调整(LCR )和带宽调整(BWR )两个阶段 来完成 ODUflex的无损带宽调整。
OTN 网络的控制平面釆用 GMPLS ( Generalized Multi-Protocol Label
Switching ) 协议栈, 其中信令釆用 RSVP-TE ( Resource Reservation Protocol-Traffic Engineering )协议。 对于端到端的 ODUflex连接来说, 在其带 宽调整过程中可能会出现调整失败的情形, 但目前对于失败的调整, 还没有 相应的控制平面处理机制。 发明内容
本发明要解决的技术问题是提供一种控制平面带宽调整处理方法, 可以 提高带宽调整的成功率。
为解决上述技术问题, 本发明提供了一种控制平面带宽调整处理方法, 包括:
标签交换路径 (LSP ) 的首节点在信令消息中携带需要调整的带宽和时 隙数, 以及重信令标识;
所述 LSP上的除首节点之外的节点接收到携带有重信令标识的信令消息 后, 判断如果调整后的带宽与调整后的时隙不匹配, 则向所述 LSP的首节点 发送带宽调整失败消息, 并在所述带宽调整失败消息中携带时隙数信息; 所述首节点接收到所述带宽调整失败消息后, 根据所述时隙数信息重新 进行带宽调整, 或取消带宽调整操作。
优选地, 所述 LSP上的除首节点之外的节点为所述 LSP经过的 ODU网 络的入口节点。
优选地,所述时隙数信息为所述 LSP上的除首节点之外的节点所在 ODU 网络需要增加或减少的时隙数。
优选地, LSP首节点预先设置重试限定条件; 所述 LSP首节点在接收到 所述带宽调整失败消息后, 判断如果满足重试限定条件, 则根据所述时隙数 信息重新进行带宽调整。
优选地, 所述重试限定条件为重试次数或者重试时间。
优选地, 所述首节点将所述重信令标识置于所述信令消息的 LSP属性对 象中。
优选地, 所述 LSP上的除首节点之外的节点釆用以下方式在所述带宽调 整失败消息中携带时隙数信息: 将所述时隙数信息置于错误信息对象 ( ERROR_SPEC ) 中的 TL V中携带。
优选地, 所述节点向 LSP的首节点发送的带宽调整失败消息中还携带有 用于表示错误原因的错误信息。 优选地, 所述错误信息置于 ERROR— SPEC对象中携带。
为解决上述技术问题,本发明还提供了一种控制平面带宽调整处理系统, 包括:
第一装置, 位于 LSP的首节点, 其设置为: 在信令消息中携带需要调整 的带宽和时隙数, 以及重信令标识;
第二装置, 位于 LSP上的除首节点之外的节点, 其设置为: 在接收到携 带有重信令标识的信令消息后, 判断如果调整后的带宽与调整后的时隙不匹 配, 则向所述 LSP的首节点发送带宽调整失败消息, 并在所述带宽调整失败 消息中携带时隙数信息;
第三装置, 位于所述 LSP的首节点, 其设置为: 在接收到所述带宽调整 失败消息后, 根据所述时隙数信息重新进行带宽调整, 或取消带宽调整操作。
优选地,所述第二装置位于的 LSP上的除首节点之外的节点为:所述 LSP 经过的 ODU网络的入口节点。
优选地,所述时隙数信息为所述 LSP上的除首节点之外的节点所在 ODU 网络需要增加或减少的时隙数。
优选地, 所述第三装置还设置为: 预先设置重试限定条件; 以及在接收 到所述带宽调整失败消息后, 判断如果满足重试限定条件, 则根据所述时隙 数信息重新进行带宽调整。
优选地, 所述重试限定条件为重试次数或者重试时间。
优选地, 所述第一装置是设置为: 釆用以下方式携带重信令标识: 将所 述重信令标识置于所述信令消息的 LSP属性对象中。
优选地, 所述第二装置是设置为: 釆用以下方式在所述带宽调整失败消 息中携带时隙数信息:将所述时隙数消息置于错误信息对象(ERROR— SPEC ) 中的 TLV中携带。
优选地, 所述第二装置还设置为: 在向所述 LSP首节点发送的带宽调整 失败消息中携带用于表示错误原因的错误信息。 优选地, 所述第二装置还设置为: 釆用以下方式携带所述错误信息: 将 所述错误信息置于 ERROR— SPEC对象中携带。
本发明实施例通过扩展控制平面信令, 使控制平面在 ODUflex ( GFP ) 连接带宽调整失败的情况下, 通过时隙数信息的协商, 尽量保证带宽调整的 成功, 从而提高带宽调整的成功率, 且不会影响客户的业务。 附图概述
图 1是带宽调的信令流程图;
图 2是一种支持 G.HAO的网络结构示意图。 本发明的较佳实施方式
下文中将结合附图对本发明的实施例进行详细说明。 需要说明的是, 在 不冲突的情况下, 本申请中的实施例及实施例中的特征可以相互任意组合。
实施例 1
本实施例方法适用于 LSP ( Label Switched Path, 标签交换路径)上节点 执行带宽调整操作时的过程:
LSP 的首节点在信令消息中携带需要调整的带宽和时隙数, 以及重信令 标识; 所述重信令标识用于指示所述 LSP上除首节点之外的其他节点在判断 调整后的带宽与调整后的时隙不匹配时将时隙数信息通知首节点;
LSP上的除首节点之外的节点接收到携带有重信令标识的信令消息后, 判断如果调整后的带宽与调整后的时隙不匹配, 则向 LSP的首节点发送带宽 调整失败消息 , 并在所述带宽调整失败消息中携带时隙数信息;
所述首节点接收到所述带宽调整失败消息后, 根据所述时隙数信息重新 进行带宽调整, 或取消带宽调整操作。
上述进行判断的 LSP上的除首节点之外的节点通常为 LSP经过的 ODU 网络的入口节点,因为通常入口节点会了解其所在 ODU网络的时隙及带宽等 情况。
节点在带宽调整失败消息中携带的时隙数信息优选为该节点所在网络需 要增加或减少的时隙数。 此外, 也可以直接携带当前时隙数与需要增加或减 少的时隙数的和, 但这种应用仅限于 LSP经过两个 ODU网络的情况。 优选 地, 除了携带时隙数信息, 节点还可以携带调整失败的原因等信息。
LSP首节点可以预先设置重试限定条件, 例如可以是重试次数或者是重 试时间 (可通过定时器来计时), LSP首节点在接收到带宽调整失败消息后, 先判断是否满足重试限定条件, 如果满足, 例如未到达重试次数或者未到达 重试时间, 则根据该时隙数信息重新进行带宽调整, 如果不满足, 例如已到 达重试次数或者已到达重试时间, 则取消带宽调整操作。 在其他实施例中, LSP也可不设置重试限定条件, 默认仅重试一次, 或者不进行重试, 直接取 消带宽调整操作。
为了与现有技术兼容, 首节点在执行带宽调整操作过程中, 即向下游节 点发送的 ODUflex ( GFP )连接信令中携带一重信令标识, 用于指示下游节 点在判断调整后的带宽与调整后的时隙不匹配时将时隙数信息通知首节点。 可对现有 RSVP-TE信令进行如下扩展以完成该功能: 对 LSP— ATTRIBUTES ( LSP属性)对象进行扩展,例如将 LSP— ATTRIBUTES对象的 LSP Attributes TLV ( Type Lenth Value, 类型长度值 ) 中的第 5比特定义为表示重信令标识 的比特位。 当该位被置 1时, 表示当中间节点在遇到带宽调整失败即调整后 的带宽与调整后的时隙不匹配时, 需要向首节点上报时隙数信息。
通过对现有 RSVP-TE信令进行如下扩展以实现中间节点上报时隙数信 息的功能:
对错误信息对象( ERROR— SPEC )进行扩展,定义一个新的时隙数 TLV, 用作携带时隙数信息。 当判断调整失败时, 中间节点使用该 TLV向首节点上 报需要的时隙数。 首节点接收到时隙数信息后, 按该 TLV中指示的时隙数重 新发起调整信令。
考虑到今后的扩展性, 还可以在 ERROR— SPEC对象中新定义如下的错 误信息: 错误码( Error Code )和错误值( Error Value ) , 用于表示错误原因。 例如: Error Code = 50表示连接调整失败;
Error Value =1 表示 ODUflex连接时隙调整失败。
以上数值仅为一种举例, 并不作为对本发明的限定。
在本实施例中, 实现上述方法的系统包括:
第一装置, 位于 LSP的首节点, 其用于在信令消息中携带需要调整的带 宽和时隙数, 以及重信令标识;
第二装置, 位于 LSP上的除首节点之外的节点, 其用于在接收到携带有 重信令标识的信令消息后, 判断如果调整后的带宽与调整后的时隙不匹配, 则向所述 LSP的首节点发送带宽调整失败消息, 并在所述带宽调整失败消息 中携带时隙数信息;
第三装置, 位于所述 LSP的首节点, 其用于在接收到所述带宽调整失败 消息后, 根据所述时隙数信息重新进行带宽调整, 或取消带宽调整操作。
优选地, 该第一装置釆用以下方式携带重信令标识: 将所述重信令标识 置于所述信令消息的 LSP属性对象中。
优选地, 第二装置所位于的 LSP上的除首节点之外的节点为: 所述 LSP 经过的 ODU网络的入口节点。 所述时隙数信息为所述 LSP上的除首节点之 外的节点所在 ODU网络需要增加或减少的时隙数。
优选地, 该第二装置釆用以下方式在所述带宽调整失败消息中携带时隙 数信息: 将所述时隙数消息置于错误信息对象(ERROR— SPEC )中的 TLV中 携带。
优选地, 该第二装置还可用于在向所述 LSP首节点发送的带宽调整失败 消息中携带用于表示错误原因的错误信息。 可釆用以下方式携带所述错误信 息: 将所述错误信息置于 ERROR— SPEC对象中携带。
优选地, 该第三装置还用于预先设置重试限定条件; 以及用于在接收到 所述带宽调整失败消息后, 判断如果满足重试限定条件, 则根据所述时隙数 信息重新进行带宽调整。 所述重试限定条件为重试次数或者重试时间。 实施例 2
本实施例以重试限定条件为重试次数为例进行说明。 如图 1 所示, LSP 上业务首节点的操作如图 1所示, 包括以下步骤:
步骤 201 , 业务首节点接收到连接带宽调整请求, 设置最大重试次数; 该请求由管理平面触发。
步骤 202, 判断当前重试次数是否小于最大重试次数, 如果是, 执行步 骤 203 , 否则执行步骤 211 ;
步骤 203 , 首节点发送带宽调整信令, 例如通过 Path (路径) 消息发送, 其中携带重信令标识以及需要调整的带宽和时隙数;
此处的时隙数可能是首节点初始设置需要调整的时隙数, 也可能是首节 点接收到中间节点反馈的时隙数信息后, 重新设定的时隙数。
步骤 204, 某中间节点收到带宽调整信令时, 检查信令消息中的参数是 否合法 (现有的合法性检查) , 如果合法, 执行步骤 205, 如果不合法, 结 束;
步骤 205 , 判断调整后的时隙数是否满足要求, 即是否满足调整后的带 宽的要求, 如果满足, 执行步骤 210, 如果不满足, 执行步骤 206;
步骤 206, 该中间节点将正确的时隙数信息 (例如对于该中间节点所在 ODU而言需要增加或减少的时隙数)填在 PathErr ( Path Error, 路径错误) 消息中并将该 PathErr消息发送至首节点;
步骤 207, 业务首节点接收到 PathErr消息后, 将当前重试次数加 1 ; 步骤 208 ,业务首节点按 PathErr消息中给定时隙数重新构造 PATH消息; 步骤 209, 业务首节点检查最大重试次数, 执行步骤 202;
步骤 210, 进行带宽调整, 并将带宽调整信令发送给下游节点, 待所有 下游节点带宽调整成功后, 流程结束;
如果该进行判断的中间节点为某 ODU网络的入口节点,则其在判断调整 后的时隙满足要求后, 控制该 ODU 网络中的下游节点按照信令要求调整带 宽, 并将该带宽调整信令转发到下一 ODU网络的入口节点。
步骤 211 , 取消信令, 带宽调整失败, 流程结束。
实施例 3
结合图 1、 图 2说明在节点 A和节点 Z之间增加带宽过程中出现失败时 的处理。 如图 2所示, 假设 A、 Z之间已存在一条带宽为 35G的 ODUflex单 向连接记为 Conl ,该连接在 ODU1网络和 ODU2网络中均占用了 27个时隙。 现在由于业务需求, 需要再增加 2.5G的带宽 (即增加后的带宽为 37.5G ) ; 并假设在 ODU1网络增加 2个时隙, 在 ODU2网络增加 3个时隙, 就能满足 G.HAO协议的要求。 控制面的处理过程包括以下步骤:
步骤 301 , 节点 A收到为 Conl连接增加 2.5G带宽的请求;
在本实施例中, 假设节点 A预设的调整重试次数为 3次。
步骤 302, 节点 A的控制平面构造 RSVP-TE信令中的 PATH消息, 将 PATH消息发送给节点 B;
节点 A按以下要求设置相应的对象:
将 LSP— ATTRIBUTES对象中的 LSP Attributes TLV重信令标识的比特位 (第 5比特位)置 1 ; 将 SENDER— TSPEC (发送者数据流业务特性)对象中 的 Traffic Parameters (业务参数 )中业务带宽字段填的值设为 37.5G; 将 NMC 字段设为 29。
步骤 303 , 节点 B的控制平面收到上述 PATH消息后, 解析出 NMC字 段和业务带宽字段,并和当前的业务时隙 27进行对比后得知需要增加 2个时 隙资源;
步骤 304, 节点 B转发上述 PATH消息给节点 C; 节点 C进一步转发给 节点 D;
步骤 305 , 节点 D的控制平面收到上述 PATH消息后, 在解析出 NMC 字段和业务带宽字段后, 得知需要为连接增加 2.5G带宽, 但与 NMC字段的 值 29相矛盾, 因为 2.5G的带宽在 ODU3网络中需要 3个时隙资源; 步骤 306, 节点 D因上述矛盾, 连接调整信令失败, 通过 PathErr消息向 节点 A上报带宽调整失败信息, 其中 PathErr消息按下面要求设置:
Error Code设为 50; Error Value设为 1; 时隙数 TLV中的值设为 30。 步骤 307, 节点 A收到节点 D的 PathErr消息后,检查重试次数。 由于重 试次数小于 3 , 重新发送调整信令 PATH消息, 此这时节点 A将 NMC字段 设为 30。
经过重试后, 下游节点成功完成连接带宽增加。
实施例 4
结合图 1、 图 2说明在节点 A和节点 Z之间减少带宽过程中出现失败时 的操作。 如图 2所示, 假设 A、 Z之间已存在一条带宽为 37.5G的 ODUflex 连接记为 Con2。 现在由于业务需求, 需要再减少 35G的带宽; 并假设该连接 原先在 OUD1 网络和 ODU2网络中均占用 30个时隙。 控制面的处理过程包 括以下步骤:
步骤 401 , 节点 A收到为 Conl连接减少 35G带宽的请求;
在本实施例中, 假设节点 A预设的调整重试次数为 2次。
步骤 402, 节点 A的控制平面构造 RSVP-TE信令中的 PATH消息, 将 PATH消息发送给节点 B;
节点 A按以下要求设置相应的对象:
LSP— ATTRIBUTES对象中的 LSP Attributes TLV重信令比特位(第 5比 特位)置 1 ; 将 SENDER— TSPEC对象中的 Traffic Parameters中业务带宽字段 填的值设为 2.5G; 将 NMC字段设为 3。
步骤 403 , 节点 B的控制平面收到上述 PATH消息后, 解析出 NMC字 段和业务带宽字段, 并和先前的业务时隙 30进行对比后得知需要减少 27个 时隙资源;
步骤 404, 节点 B转发上述 PATH消息给节点 C; 节点 C进一步转发给 节点 D; 步骤 405, 节点 D的控制平面收到上述 PATH消息后, 在解析出 NMC 字段和业务带宽字段后, 得知需要为连接减少 35G带宽, 但与 NMC字段的 值 3相矛盾, 因为 35G的带宽在 ODU3网络中需要 28个时隙资源;
步骤 406, 节点 D因上述矛盾, 连接调整信令失败, 通过 PathErr消息向 节点 A上报带宽调整失败信息, 其中 PathErr消息按下面要求设置:
Error Code设为 50; Error Value设为 1; 时隙数 TLV中的值设为 2。 步骤 407, 节点 A收到节点 D的 PathErr消息后,检查重试次数。 由于重 试次数小于 2, 重新发送调整信令 PATH消息, 此时节点 A将 NMC字段设 为 2。
经过重试后, 下游节点成功完成连接带宽减少。
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。
当然, 本发明还可有其他多种实施例, 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性 本发明实施例通过扩展控制平面信令, 使控制平面在 ODUflex ( GFP ) 连接带宽调整失败的情况下, 通过时隙数信息的协商, 尽量保证带宽调整的 成功, 从而提高带宽调整的成功率, 且不会影响客户的业务。

Claims

权 利 要 求 书
1、 一种控制平面带宽调整处理方法, 包括:
标签交换路径 (LSP ) 的首节点在信令消息中携带需要调整的带宽和时 隙数, 以及重信令标识;
所述 LSP上的除首节点之外的节点接收到携带有重信令标识的信令消息 后, 判断如果调整后的带宽与调整后的时隙不匹配, 则向所述 LSP的首节点 发送带宽调整失败消息, 并在所述带宽调整失败消息中携带时隙数信息; 所述首节点接收到所述带宽调整失败消息后, 根据所述时隙数信息重新 进行带宽调整, 或取消带宽调整操作。
2、 如权利要求 1所述的方法, 其中,
所述 LSP上的除首节点之外的节点为所述 LSP经过的光数据单元( ODU ) 网络的入口节点。
3、 如权利要求 1或 2所述的方法, 其中,
所述时隙数信息为所述 LSP上的除首节点之外的节点所在 ODU网络需 要增加或减少的时隙数。
4、 如权利要求 1所述的方法, 其中,
LSP首节点预先设置重试限定条件;
所述 LSP首节点在接收到所述带宽调整失败消息后, 判断如果满足重试 限定条件, 则根据所述时隙数信息重新进行带宽调整。
5、 如权利要求 4所述的方法, 其中,
所述重试限定条件为重试次数或者重试时间。
6、 如权利要求 1所述的方法, 其中,
所述首节点将所述重信令标识置于所述信令消息的 LSP属性对象中。
7、 如权利要求 1所述的方法, 其中,
所述 LSP上的除首节点之外的节点釆用以下方式在所述带宽调整失败消 息中携带时隙数信息:将所述时隙数信息置于错误信息对象 ( ERROR— SPEC ) 中的类型长度值(TLV ) 中携带。
8、 如权利要求 1或 6或 7所述的方法, 其中,
所述节点向 LSP的首节点发送的带宽调整失败消息中还携带有用于表示 错误原因的错误信息。
9、 如权利要求 8所述的方法, 其中,
所述错误信息置于 ERROR— SPEC对象中携带。
10、 一种控制平面带宽调整处理系统, 包括:
第一装置, 位于 LSP的首节点, 其设置为: 在信令消息中携带需要调整 的带宽和时隙数, 以及重信令标识;
第二装置, 位于 LSP上的除首节点之外的节点, 其设置为: 在接收到携 带有重信令标识的信令消息后, 判断如果调整后的带宽与调整后的时隙不匹 配, 则向所述 LSP的首节点发送带宽调整失败消息, 并在所述带宽调整失败 消息中携带时隙数信息;
第三装置, 位于所述 LSP的首节点, 其设置为: 在接收到所述带宽调整 失败消息后, 根据所述时隙数信息重新进行带宽调整, 或取消带宽调整操作。
11、 如权利要求 10所述的系统, 其中,
所述第二装置位于的 LSP上的除首节点之外的节点为: 所述 LSP经过的 ODU网络的入口节点。
12、 如权利要求 10或 11所述的系统, 其中,
所述时隙数信息为所述 LSP上的除首节点之外的节点所在 ODU网络需 要增加或减少的时隙数。
13、 如权利要求 10所述的系统, 其中,
所述第三装置还设置为: 预先设置重试限定条件; 以及在接收到所述带 宽调整失败消息后, 判断如果满足重试限定条件, 则根据所述时隙数信息重 新进行带宽调整。
14、 如权利要求 13所述的系统, 其中,
所述重试限定条件为重试次数或者重试时间。
15、 如权利要求 10所述的系统, 其中,
所述第一装置是设置为: 釆用以下方式携带重信令标识: 将所述重信令 标识置于所述信令消息的 LSP属性对象中。
16、 如权利要求 10所述的系统, 其中,
所述第二装置是设置为: 釆用以下方式在所述带宽调整失败消息中携带 时隙数信息:将所述时隙数消息置于错误信息对象(ERROR— SPEC )中的 TLV 中携带。
17、 如权利要求 10或 15或 16所述的系统, 其中,
所述第二装置还设置为: 在向所述 LSP首节点发送的带宽调整失败消息 中携带用于表示错误原因的错误信息。
18、 如权利要求 17所述的系统, 其中,
所述第二装置还设置为: 釆用以下方式携带所述错误信息: 将所述错误 信息置于 ERROR— SPEC对象中携带。
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