CN103326956A - Quality of service (QoS) maintaining method, device and system - Google Patents

Quality of service (QoS) maintaining method, device and system Download PDF

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CN103326956A
CN103326956A CN 201310277446 CN201310277446A CN103326956A CN 103326956 A CN103326956 A CN 103326956A CN 201310277446 CN201310277446 CN 201310277446 CN 201310277446 A CN201310277446 A CN 201310277446A CN 103326956 A CN103326956 A CN 103326956A
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atm
atm cell
qos
newly received
cell
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CN 201310277446
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胡海涛
陈今今
颜志勇
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华为技术有限公司
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Abstract

The invention discloses a Quality of service (QoS) maintaining method which comprises steps of identifying a CLP and a business type of a newly received ATM cell and obtaining the corresponding QoS mark, when the corresponding QoS mark of the newly received ATM cell is different from the corresponding QoS mark of a cached ATM cell, carrying out cascade packaging of the cached ATM cell into a pseudo linear PW message and sending the message, and with the corresponding QoS mark of the cached ATM cell as a QoS mark of a PSN transmission head of the PW message, or with the corresponding QoS mark of the cached ATM cell as the QoS mark of the PSN transmission head and a PW head of the PW message at the same time, caching the newly received ATM cell. The invention also provides the corresponding operator edge equipment PE and an ATM PWE3 system. According to the technical scheme of the invention, the priorities of all ATM cells contained in one PW message packaged in an ATM PWE3 cell in a cascaded way can be the same, and the more accurate service quality is provided.

Description

一种服务质量QoS保持方法、装置及系统技术领域 A quality-of service QoS BACKGROUND holding method, apparatus and system for

[0001] 本发明涉及通信技术领域,具体涉及一种服务质量QoS保持方法、装置及系统。 [0001] The present invention relates to communication technologies, and particularly relates to a method for maintaining the quality of service QoS, device and system.

背景技术 Background technique

[0002] 端到端伪线仿真(Pseudo Wire Emulation Edge to Edge,PWE3)是指在分组交换网络(Packet Switched Network, PSN)中尽可能真实地模仿异步传输模式(AsynchronousTransfer Mode, ATM)、巾贞中继、以太网、低速时分复用(Time Division Multiplexing, TDM)电路和同步光纤网(Synchronous Optical Network, S0NET)及同步数字体系(SynchronousDigital Hierarchy, SDH)等业务的基本行为和特征的,一种端到端的二层业务承载技术,属于点到点方式的二层虚拟专用网(Layer2virtual private network, L2VPN)。 [0002] pseudo wire emulation end (Pseudo Wire Emulation Edge to Edge, PWE3) refers to the packet-switched network (Packet Switched Network, PSN) as far as possible emulates ATM (AsynchronousTransfer Mode, ATM), Zhen towel relay, Ethernet basic behavior and characteristics, a low-speed time division multiplexing (Time Division Multiplexing, TDM) circuit and a synchronous optical network (synchronous optical network, S0NET) and synchronous digital hierarchy (SynchronousDigital Hierarchy, SDH) services, etc. a Layer 2 service end bearing technology, the way point belonging to Layer virtual private network (Layer2virtual private network, L2VPN).

[0003] ATM PWE3是一种在PWE3虚电路上承载ATM信元的技术,利用PSN网络将传统的ATM网络连通起来,在PSN网络上提供ATM业务的仿真,在传统的ATM网络业务穿越PSN网络时最大限度的仿真原始业务,使端用户感受不到差异性,在网络整合和建设中保护用户和运营商的已有投资。 [0003] PWE3 ATM is a virtual circuit carried on PWE3 ATM cell technology that uses the PSN network communicated with traditional ATM network, providing ATM service emulation over a PSN, in the conventional ATM network traffic across the network PSN when the maximum simulation of the original business, so that end users do not feel the difference and protect existing investment of users and operators in the network consolidation and construction.

[0004] 请参考图1和图2,互联网工程任务组(Internet Engineering Task Force,IETF)制定的RFC4717标准定义了ATM PWE3的参考模型。 [0004] Please refer to Figures 1 and 2, the Internet Engineering Task Force (Internet Engineering Task Force, IETF) developed by RFC4717 standard defines ATM PWE3 reference model. ATM PWE3通过连接两个运营商边缘(Provider Edge, PE)设备的PSN隧道(Tunner),例如连接PEl和PE2的多协议标记交换隧道(Multiprotocol Label Switching Tunner, MPLS Tunner)透明传递用户边缘(Customer Edge,CE)设备端的各种二层业务例如各种二层数据报文。 ATM PWE3 (Provider Edge, PE) PSN tunnel (Tunner) devices, such as multi-protocol connectivity PEl and PE2 label switching tunnel by connecting two provider edge (Multiprotocol Label Switching Tunner, MPLS Tunner) transparently transmits the customer edge (Customer Edge , CE) terminal equipment such as various services of various Layer 2 data packets. CE与PE之间为ATM接口(Service)或ATM 模式的各种数字用户线路(X Digital Subscribe Line,xDSL)接口,其中的数据封装形式为ATM信元。 To ATM interface (Service) or ATM mode between CE and PE various digital subscriber line (X Digital Subscribe Line, xDSL) interface, the data are encapsulated into ATM cells. 隧道中可以有多条伪线(Pseudo Wire,PW)用于承载传递封装有ATM信元的PW报文。 Tunnel can have multiple dummy lines (Pseudo Wire, PW) for carrying transmitting an ATM cell is encapsulated PW packet.

[0005] ATM PWE3有多种封装方式,包括:一对一(one to one)封装方式,多对一(N toone)封装方式等。 [0005] ATM PWE3 package a variety of ways, including: one (one to one) packages, many to one (N toone) packages and the like. 根据PW报文中承载的ATM连接类型的不同,one to one封装方式又包括:one to one 虚电路连接(Virtual Circuit Connection, VCC)封装方式和one to one虚通道连接(Virtual Path Connection, VPC)封装方式;N to one封装方式又包括:N toone虚电路连接(Virtual Circuit Connection, VCC)封装方式和N to one虚通道连接(Virtual Path Connection, VPC)封装方式。 Depending on the ATM connection types PW packet carried in, one to one encapsulation further comprising: one to one virtual circuit connections (Virtual Circuit Connection, VCC) packages and one to one virtual path connections (Virtual Path Connection, VPC) encapsulation; N to one way and the package comprising: N toone virtual circuit connections (virtual circuit connection, VCC) packages and N to one virtual path connections (virtual path connection, VPC) packages.

[0006] IETF制定的RFC4717标准定义了ATM PWE3的封装方法。 [0006] IETF RFC4717 standard developed by a packaging method defined in ATM PWE3. 请参考图3和图4,N toone ATM PWE3和one to one ATM PWE3封装各自包括四个域,依次为:PSN传输头部,PW头部,ATM控制字,ATM业务净荷。 Please refer to FIG. 3 and FIG. 4, N toone ATM PWE3 and one to one ATM PWE3 each package comprises four domains, followed by: PSN transport header, the PW header, ATM control word, ATM traffic payload. 由于一个PW报文仅封装一个ATM信元时的封装效率较低、带宽利用率较低,因此RFC4717定义了在一个PW报文中封装多个ATM信元的方法,称为信元级联。 Due to the low encapsulation efficiency of a PW packet encapsulates an ATM cell only when bandwidth utilization is low, so RFC4717 defines a method for encapsulating a plurality of ATM cells in a PW packets, called cells cascade.

[0007] 请参考图5和图6,不使用信元级联时,一个PW报文中只有一个ATM信元,ATM信元头中的信元丢弃优先级(Cell Loss Priority,CLP)位可以映射到PSN传输头部或PW头部的服务质量(Quality of Service, QoS)标记上,以便在PSN中传输时提供与被封装的ATM信元的CLP —致的QoS。 [0007] Please refer to FIG. 5 and FIG. 6, when not in use cell concatenation, a PW packet only an ATM cell, the ATM cell header discarding priority (Cell Loss Priority, CLP) bit may mapping quality of service PW PSN transport header or header (quality of service, QoS) marks, so as to provide ATM cells encapsulated in the PSN transmission CLP - QoS consistent. CLP位为I时表示该ATM信元可以被丢弃,这时QoS标记为低优先级;CLP位为O时表示该ATM信元不能被丢弃,这时QoS标记为高优先级。 I CLP bit is represented by the ATM cell may be discarded, then the QoS marked as low priority; denotes the ATM cell can not be discarded, then the QoS marked as high priority bit CLP when O.

[0008] 使用信元级联封装时,如图7和8所示,一个PW报文中可以包含多个ATM信元,不同的ATM信元因CLP位的不同以及业务类型的不同,要求映射到QoS标记的优先级也不同。 [0008] When using cell concatenation package, as shown in Figures 7 and 8, a PW packet may contain a plurality of ATM cells, ATM cells of different depending on the type of service and the CLP bit map requires a priority QoS marking is also different. 对此问题,RFC4717建议,将一个PW报文中所有ATM信元的要求映射到QoS标记的最高优先级映射到PSN传输头部或PW头部的QoS标记;这就导致,该PW报文中其它低优先级的ATM信元在PSN传输时的QoS等级被提高了,使被封装的ATM信元在PSN中传输时没有完全仿真原始业务。 On this issue, RFC4717 recommends that maps a PW packet requires that all ATM cells to QoS marking the highest priority is mapped to QoS marking PSN transport header or PW head; which led to the PW packet other low priority QoS class ATM cell transmission when PSN is increased, so that the ATM cells are not fully encapsulated emulated to the transmission in the PSN.

发明内容 SUMMARY

[0009] 本发明实施例提供一种服务质量QoS保持方法、装置及系统。 Embodiment [0009] The present invention provides a method for maintaining the quality of service QoS, device and system.

[0010] 一种服务质量QoS保持方法,包括: [0010] A method for maintaining the quality of service QoS, comprising:

[0011] 运营商边缘PE设备识别新接收的异步传输模式ATM信元的信元丢弃优先级CLP和业务类型,根据该CLP和业务类型得到对应的服务质量QoS标记; ATM cell ATM cells [0011] The provider edge PE device identifies the newly received loss priority CLP and the service type, QoS marking the CLP and the service type corresponding to the service according to the quality obtained;

[0012] 在本地缓存中有已缓存的ATM信元时,比较新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记是否相同; [0012] when the ATM cell has been cached in the local cache, QoS marking relatively new ATM cells received corresponding to the buffered ATM cell corresponding QoS label are the same;

[0013] 如果相同,缓存新接收的ATM信元; [0013] If the same, ATM buffer the newly received channel element;

[0014] 如果不同,将已缓存的ATM信元级联封装在伪线PW报文中并发送,其中以已缓存的ATM信元对应的QoS标记作为该PW报文的分组交换网络PSN传输头部的QoS标记,或者同时作为该PW报文的PSN传输头部和PW头部的QoS标记,并缓存新接收的ATM信元。 [0014] If not, the buffered ATM cell concatenation of encapsulating and transmitting the pseudo-wire PW packet, wherein the buffered ATM cell corresponding to the QoS label PW packet as packet-switched network PSN transport header QoS marking portion, or both as a QoS marker PSN transport header and the PW PW header packet, and buffers the newly received ATM cell.

[0015] 一种运营商边缘PE设备,包括: [0015] A provider edge PE device, comprising:

[0016] 优先级获取单元,用于识别新接收的异步传输模式ATM信元的信元丢弃优先级CLP和业务类型,根据该CLP和业务类型得到对应的服务质量QoS标记; [0016] The priority acquiring unit for identifying asynchronous transfer mode ATM cells newly received cell loss priority CLP and the service type, QoS marking the CLP and the service type corresponding to the service according to the quality obtained;

[0017] 处理单元,用于判断合并缓存单元中是否已存储有ATM信元,如果有,则比较新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记是否相同,如果相同,则指令该合并缓存单元缓存新接收的ATM信元;如果不同,则指令封装发送单元对存储在该合并缓存单元中的ATM信元进行封装发送,并指令该合并缓存单元缓存新接收的ATM信元; [0017] processing means for determining whether to merge the cache unit already stored in the ATM cell, if there is, then the ATM cell corresponding to the newly received QoS tag comparison with the buffered ATM cell corresponding QoS label are the same, If so, the instruction ATM cell and the combined buffer means buffers a newly received; If not, the instruction package transmission unit of ATM cells stored in the merge buffer unit encapsulates the transmission, and instructs the merge buffer means buffers a newly received ATM cell;

[0018] 合并缓存单元,用于根据处理单元的指令,缓存新接收的ATM信元; [0018] Merge buffering unit, according to an instruction processing unit for, ATM cells newly received buffer;

[0019] 封装发送单元,用于根据处理单元的指令,将已缓存在合并缓存单元中的ATM信元级联封装在伪线PW报文中并发送,其中以已缓存的ATM信元对应的QoS标记作为该PW报文的分组交换网络PSN传输头部的QoS标记,或者同时作为该PW报文的PSN传输头部和PW头部的QoS标记。 [0019] The transmitting unit package, according to the instruction processing unit, the buffered ATM cells encapsulated in the merged concatenation buffer unit and the pseudo-wire PW transmitted packets, which have been buffered corresponding to the ATM cell QoS marking the PW packet as a packet switching network PSN transport QoS marking head, or at the same time as the QoS tag PSN transport header and the PW PW header packet.

[0020] 一种异步传输模式端到端伪线仿真ATM PWE3系统,包括:用户边缘CE设备和运营商边缘PE设备; [0020] An ATM end system ATM PWE3 pseudo wire emulation, comprising: a Customer Edge CE device and provider edge PE devices;

[0021] CE设备,用于发送异步传输模式ATM信元给与之相连的PE设备; [0021] CE device for sending asynchronous transfer mode ATM cells to the PE device connected thereto;

[0022] PE设备,用于接收CE设备发送的ATM信元并识别新接收的ATM信元的信元丢弃优先级CLP和业务类型,根据该CLP和业务类型得到对应的服务质量QoS标记;在本地缓存中有已缓存的ATM信元时,比较新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记是否相同;如果相同,缓存新接收的ATM信元;如果不同,将已缓存的ATM信元级联封装在伪线PW报文中并发送,其中以已缓存的ATM信元对应的QoS标记作为该PW报文的分组交换网络PSN传输头部的QoS标记,或者同时作为该PW报文的PSN传输头部和PW头部的QoS标记,并缓存新接收的ATM彳目兀。 [0022] PE device for receiving ATM cells transmitted from CE device and identifies the ATM cell loss priority newly received CLP and the service type, quality of service QoS to give the corresponding labeled according to the CLP and the service type; in when the local cache of the ATM cell has been buffered, ATM cell corresponding QoS tag comparison newly received and buffered ATM cell corresponding QoS label; if they identical, ATM channel buffer newly received metadata; if different the buffered ATM cell concatenation of encapsulating and transmitting the pseudo-wire PW packet, wherein the buffered ATM cells as packets corresponding to the QoS label PW packet switching network PSN QoS label transfer head, or it is used as the PW packet QoS marking PSN transport header and a PW header, and buffering newly received ATM mesh Wu left foot.

[0023] 本发明实施例提供的QoS保持方法,采用在新接收到的ATM信元的优先级与已缓存的ATM信元的优先级不同时,将已缓存的ATM信元级联封装为PW报文并发送,其中以已缓存的ATM信元对应的QoS标记作为该PW报文的PSN传输头部的QoS标记,或者同时作为PSN传输头部和PW头部的QoS标记,从而使得一个PW报文包含的所有ATM信元的优先级相同,以完全仿真原始业务。 [0023] QoS according to an embodiment of the present invention holding method using the priority of the buffered ATM cell ATM cells newly received is not the same, the buffered ATM cell concatenation encapsulated into PW and transmitting packets, which have been buffered corresponding ATM cell as the QoS label QoS label PW PSN transport packet header, or is used as QoS tag PSN transport header and a PW header, so that a PW All the same priority ATM cell packet contains in order to fully emulate the original business.

附图说明 BRIEF DESCRIPTION

[0024] 图1是RFC4717标准定义的ATM PWE3的参考模型; [0024] FIG. 1 is a reference model ATM PWE3 RFC4717 standard defined above;

[0025] 图2是基于MPLS的PWE3网络拓扑结构示意图; [0025] FIG. 2 is a schematic diagram of the MPLS PWE3 network topology based;

[0026] 图3是one to one ATM PWE3封装的数据结构示意图; [0026] FIG. 3 is a schematic view of a data structure of one to one ATM PWE3 package;

[0027] 图4是N to one ATM PWE3封装的数据结构示意图; [0027] FIG. 4 is a diagram showing a data structure of N to one ATM PWE3 package;

[0028] 图5是现有one to one ATM PffE3封装无信元级联时QoS标记映射示意图; [0028] FIG. 5 is a schematic view of an existing QoS tag map one to one ATM PffE3 package without cell concatenation;

[0029] 图6是现有N to one ATM PWE3封装无信元级联时QoS标记映射示意图; [0029] FIG. 6 is a schematic view of an existing QoS tag mapping N to one ATM PWE3 cell concatenation without package;

[0030] 图7是现有one to one ATM PWE3封装有信元级联时QoS标记映射示意图; [0030] FIG. 7 is a conventional one to one ATM PWE3 encapsulated tag mapping QoS schematic view of cell concatenation;

[0031] 图8是现有N to one ATM PWE3封装有信元级联时QoS标记映射示意图; [0031] FIG. 8 is a conventional N to one ATM PWE3 encapsulated tag mapping QoS schematic view of cell concatenation;

[0032] 图9是本发明实施例提供的服务质量QoS保持方法涉及的系统组网图; [0032] FIG. 9 is an embodiment of the present invention, the quality of service provided by networking QoS holding method according to the system of FIG;

[0033] 图10是本发明一个实施例提供的服务质量QoS保持方法的流程图; [0033] FIG. 10 is a flowchart of the quality of service QoS provided a method of holding embodiment of the present invention;

[0034] 图11是本发明提供的QoS保持方法用于一个应用场景的示意图; [0034] FIG. 11 is a QoS present invention provides a method for retaining a schematic application scenario;

[0035] 图12是本发明提供的QoS保持方法用于另一个应用场景的示意图; [0035] FIG. 12 is a QoS present invention provides a method for retaining a schematic view of another application scenario;

[0036] 图13是本发明提供的QoS保持方法用于又一个应用场景的示意图; [0036] FIG. 13 is a QoS present invention provides a method of maintaining a schematic view of a further application scenario for;

[0037] 图14是本发明一个实施例提供的运营商边缘PE设备的示意图; [0037] FIG. 14 is a schematic diagram of a provider edge PE device according to an embodiment of the present invention;

[0038] 图15是本发明另一个实施例提供的运营商边缘PE设备的示意图。 [0038] FIG. 15 is a schematic view of another embodiment of the present invention, a provider edge PE device is provided.

具体实施方式 detailed description

[0039] 本发明实施例提供一种服务质量QoS保持方法,采用在新接收到的ATM信元的优先级与已缓存的ATM信元的优先级不同时,将已缓存的ATM信元级联封装为PW报文并发送,其中以已缓存的ATM信元对应的QoS标记作为该PW报文的PSN传输头部的QoS标记,或者同时作为该PW报文的PSN传输头部和PW头部的QoS标记,从而使得一个PW报文包含的所有ATM信元的优先级相同,以完全仿真原始业务。 The embodiment provides a method for maintaining the quality of service QoS, using ATM cells in cascade with the priority of the buffered ATM cell ATM cells newly received is not the same, the buffered [0039] The present invention PW encapsulated into packets and transmitted, wherein the buffered ATM cell corresponding QoS label QoS label as the PW packet PSN transport header or as both the PSN transport packet header and PW PW head the QoS marking, so that the same priority in all the ATM cells contained in a PW packet to completely are emulated. 本发明实施例还提供相应的运营商边缘PE设备和ATMPWE3系统。 Embodiments of the invention also provides a corresponding provider edge PE device and ATMPWE3 system. 以下分别进行详细说明。 The following are described in detail.

[0040] 本发明实施例提供一种服务质量QoS保持方法,应用于使用级联封装的ATMPWE3。 [0040] The present invention provides a method for maintaining quality of service (QoS), it is applied to the package using a cascade ATMPWE3. 请参考图9所示的ATM PWE3的系统组网图,其中,PEl和PE2是PSN网络中的运营商边缘设备,CEl和CE2是ATM网络中的用户边缘设备,PEl通过ATM接口和CEl连接,PE2通过ATM接口和CE2连接,PSN网络中建立有联通PEl和PE2的PWE3伪线。 Please refer to FIG system of the PWE3 ATM network shown in FIG. 9, wherein, PEl and PE2 are provider edge PSN network, CEl and CE2 are customer edge device in an ATM network, an ATM interface and connected by PEl CEl, PE2 and CE2 are connected through the ATM interface, Unicom PEl and PE2 establish the PSN PWE3 pseudo wire network. 假设CEl准备发送ATM信元到CE2,则首先CEl发送ATM信元给PE1,PE1将该ATM信元封装为PW报文后沿着PWE3伪线发送给PE2,PE2将PW报文解封装后,将其中的ATM信元发送给CE2。 Suppose CEl ready to be sent to the ATM cell CE2, CEl transmitting the first ATM cell to the PE1, PE1 encapsulating the ATM cell is sent to PE2 pseudo wire along PWE3 packet after PW, PW PE2 will hereinafter decapsulation, wherein the ATM cells sent to CE2.

[0041] 请参考图10,本发明的一个实施例提供的服务质量QoS保持方法,包括: [0041] Please refer to FIG. 10, a quality of service provided by the embodiment of the present invention, QoS holding method comprising:

[0042] 101、运营商边缘PE设备识别新接收的异步传输模式ATM信元的信元丢弃优先级CLP和业务类型,根据CLP和业务类型得到对应的服务质量QoS标记。 [0042] 101, ATM cell ATM cells provider edge PE device identifies the newly received loss priority CLP and the service type, quality of service QoS to give the corresponding CLP and labeled according to the service type.

[0043] PE设备接收到CE设备发送的ATM信元后,首先识别ATM信元头中的CLP和业务类型,根据CLP和业务类型获取可以映射到PW报文的PSN传输头部和PW头部的QoS标记,以便在后续步骤中通过QoS标记决定PW报文中级联封装的ATM信元的数量。 After [0043] PE device receives ATM cells transmitted from CE device, first identified in the ATM cell header CLP and the service type, a packet may be mapped to the PW PSN transport header and a PW header according to the service type and CLP QoS markings, so the number of PW packet concatenation of ATM cells encapsulated determined by QoS label in a subsequent step.

[0044] ATM信元的CLP位为I时表示该ATM信元可以被丢弃,从而可以将该ATM信元对应的QoS标记为低优先级;CLP位为O时表示该ATM信元不能被丢弃,从而可以将该ATM信元对应的QoS标记为高优先级。 [0044] CLP bit in the ATM cell when the ATM cell indicates I can be discarded, thereby the QoS label corresponding to the ATM cell as a low priority; denotes the ATM cell CLP bit can be discarded as O , which can mark the ATM cells corresponding to QoS for high priority.

[0045] 由于CLP位可以映射两种优先级,因而可以预先为每一种业务类型定义两个优先级,从而映射得到每一个ATM信元对应的QoS标记。 [0045] Since the CLP bits may be mapped two kinds of priority, it is possible to advance two priority defined for each service type, thereby mapping a QoS of each marker corresponding to the ATM cell.

[0046] ATM信元的业务类型包括:恒定比特率(Constant Bit Rite,CBR),可变比特率(Variable Bit Rite, VBR),实时可变比特率(real time-Variable Bit Rite, rt-VBR),未指定比特率(Unspecified Bit Rite, UBR)等,本文不做限制。 [0046] ATM cell traffic type comprises: a constant bit rate (Constant Bit Rite, CBR), variable bit rate (Variable Bit Rite, VBR), real-time variable bit rate (real time-Variable Bit Rite, rt-VBR ), unspecified bit rate (unspecified bit Rite, UBR) and the like, which is not limited herein.

[0047] 可以设定上述四种业务类型的优先级从高到底依次为:CBR,rt-VBR, VBR, UBR,每一个ATM信元的CLP位的取值又包括O和I两种,则:业务类型为UBR且CLP位为I的ATM信元对应的QoS标记的优先级可以是最低的0,业务类型为UBR且CLP位为O的ATM信元对应的QoS标记的优先级可以是I,业务类型为VBR且CLP位为I的ATM信元对应的QoS标记的优先级可以是2,业务类型为VBR且CLP位为O的ATM信元对应的QoS标记的优先级可以是3……业务类型为CBR且CLP位为O的ATM信元对应的QoS标记的优先级可以是最高的8。 [0047] can be set to the above four types of traffic from the high priority order in the end is: CBR, rt-VBR, VBR, UBR, a value CLP bits per ATM cell also includes two kinds of I and O, the : service type is UBR and the CLP bit is I ATM cell corresponding QoS tag priority may be the lowest 0, service type is UBR and the CLP bit of an ATM cell corresponding to O of QoS tag priority may be I , and the VBR service type I CLP bit of ATM cells corresponding QoS priority may be labeled 2, and the VBR service type CLP bit of the ATM cell of the corresponding O QoS priority may be labeled ...... 3 ATM cells corresponding to the service type and the CLP bit CBR QoS marking is O may be the highest priority 8.

[0048] 102、在本地缓存中有已缓存的ATM信元时,比较新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记是否相同。 [0048] 102, when the ATM cell has been cached in the local cache, QoS marking relatively new ATM cells received corresponding to the buffered ATM cell corresponding QoS label are the same.

[0049] PE设备接收到CE设备发送的ATM信元后,先判断本地缓存中是否缓存有待封装发送的ATM信元,若没有,则直接缓存新接收的ATM信元作为下一个待封装发送的PW报文中的第一个ATM信元;若本地缓存中有已缓存的ATM信元,则还需要比较新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记是否相同,来决定是否直接缓存该新接收的ATM信元。 [0049] PE device receives the ATM cells CE sent by first determining whether the local cache buffer to be ATM cells encapsulated transmitted, if not, directly cache ATM cells newly received as the next to be encapsulated transmitted PW packet in a first ATM cell; if the ATM cell has been cached in local cache, you also need to compare the newly received ATM cell corresponding to the QoS label buffered ATM cell corresponding to whether the QoS label same, to determine whether the cache directly to the new ATM cell is received.

[0050] 103、如果新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记相同,缓存新接收的ATM信元。 [0050] 103, if the same QoS label the newly received ATM cell corresponding to the buffered ATM cell corresponding QoS label, ATM cells newly received buffer.

[0051 ] 当新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记相同时,直接缓存新接收的ATM信元,从而使得本地缓存中所有的ATM信元对应的QoS标记是相同的。 [0051] When the QoS label ATM cells corresponding to the newly received QoS label buffered ATM cells corresponding to the same direct buffer ATM cells newly received, so that the local cache of all ATM cells corresponding QoS is the same numerals.

[0052] 在一个实施例中,直接缓存新接收的ATM信元之后,还需要判断本地缓存的ATM信元是否满足发送条件,若是,则将本地缓存中所有的ATM信元包括缓存的新接收的ATM信元级联封装在一个PW报文中发送出去,并以本地缓存的ATM信元对应的QoS标记作为该PW报文的PSN传输头部的QoS标记,或者同时作为该PW报文的PSN传输头部和PW头部的QoS标记。 [0052] In one embodiment, the cache directly after the newly received ATM cell, if the local cache also need to determine the ATM cell satisfies the transmission condition, if all the ATM cells will be included in the local cache receiving the new buffer concatenation of ATM cells encapsulated in a PW transmitted packet out the local cache and to the ATM QoS tag element corresponding QoS label PSN transport header as the PW packet, or is used as the PW packet QoS PSN transport header and a PW header mark. 所说的发送条件可以包括:已接收并缓存的ATM信元达到最大信元数,或者达到最大信元打包时延等,本实施例对此不做限制。 Said transmission conditions may include: a received ATM cells and buffer reaches the maximum number of cells, or the maximum delay cell packing and the like, not limited in the present embodiment. 例如,可以预设一个最大信元数M,M为正整数;假定本地缓存中已有M-1个QoS标记均为2的ATM信元,当直接缓存新接收的QoS标记也为2的ATM信元之后,本地缓存中的ATM信元达到M个,满足发送条件,则将该M个ATM信元级联封装在一个PW报文中发送出去,该PW报文的PSN传输头部的QoS标记为2,或者PSN传输头部和PW头部的QoS标记均为2。 For example, a predetermined maximum cell number M, M being a positive integer; assumed that the local cache has the M-1 ATM cells are labeled QoS 2, QoS marking when direct cache is also newly received ATM 2 after cells, ATM cells in the local cache reaches the M, satisfies the transmission condition, then the concatenation M ATM cells encapsulated in a PW transmitted packet, QoS PSN transmission of the packet header PW labeled 2, or PW QoS PSN transport header and header 2 are marked.

[0053] 104、如果新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记不同,将已缓存的ATM信元级联封装在伪线PW报文中并发送,其中以已缓存的ATM信元对应的QoS标记作为该PW报文的分组交换网络PSN传输头部的QoS标记,或者同时作为该PW报文的PSN传输头部和PW头部的QoS标记,并缓存新接收的ATM信元。 [0053] 104, if the ATM cell corresponding to the newly received QoS marking different QoS label buffered ATM cell corresponding to the buffered ATM cell concatenation of encapsulating and transmitting the pseudo-wire PW packet, wherein to the buffered ATM cell corresponding to the QoS label as PW packet QoS marking packet switched network PSN transport header, or is used as the PW packet QoS marking PSN transport header and a PW header, and buffering the newly received ATM cell.

[0054] 当新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记不同时,则将本地缓存中已有的ATM信元级联封装在一个PW报文中发送给接收端PE设备,其中以已缓存的ATM信元对应的QoS标记作为该PW报文的PSN传输头部的QoS标记,或者同时作为PSN传输头部和PW头部的QoS标记。 [0054] When the QoS label corresponding to the ATM cell is buffered and newly received ATM cell corresponding QoS label is not the same, then the local cache already concatenation of ATM cells encapsulated in a PW to a packet receiving terminal PE device, wherein the buffered ATM cell corresponding to the mark as the QoS QoS label PW PSN transport packet header, or is used as QoS tag PSN transport header and a PW header. 可以在将该PW报文发送出去以后,再缓存新接收的ATM信元,以便将该新接收的ATM信元作为下一个PW报文中第一个ATM信元;也可以先缓存该新接收的QoS标记不同的ATM信元,但是封装PW报文时仅封装之前缓存的QoS标记相同的ATM信元并发送,而将该新接收的ATM信元保留在本地缓存中;当然,封装发送PW报文的步骤和缓存新接收的ATM信元的步骤也可以同时执行;在这若干种实施方式中,封装发送PW报文的步骤和缓存新接收的ATM信元的步骤不必有时间上的先后顺序,只需保证封装发送的PW报文中不包括该新接收的QoS不同的ATM信元,并在适当时刻缓存该新接收的ATM信元即可。 Can later send out the PW packet, then the cache of the newly received ATM cell, the ATM cell to the newly received packet as a next PW the first ATM cell; may be received prior to the new cache different QoS label of the ATM cell, but the same buffer before the ATM cell only when the encapsulated package PW packet transmission and QoS marking, and the newly received ATM cell element remains in the local cache; of course, sending the encapsulated PW step ATM cell packet step and cache newly received may be executed simultaneously; in that several embodiments, the step ATM cell PW packet step and cache the newly received encapsulated and sent do not have successively in time order, only to ensure encapsulated PW packet transmission is not included in the newly received different from the QoS of the ATM cell, and the newly received ATM cell to the buffer at the appropriate time.

[0055] 在一个实例中,假设本地缓存中保存着第m到第η共nm个ATM信元,对应的QoS标记为2,新接收的第n+1个ATM信元对应的QoS标记为3 ;则将已缓存的n_m个ATM信元级联封装在一个PW报文中并发送,将该PW报文的PSN传输头部的QoS标记为2,或者同时将该PW报文的PSN传输头部的QoS标记以及该PW报文头部的QoS标记为2 ;在级联封装nm个ATM信元之后,或者其它适当时刻,缓存第n+1个ATM信元,该第n+1个ATM信元将成为下一个PW报文中级联封装的第I个ATM信元。 [0055] In one example, assume that the local cache holds the m-th to the first η Total nm ATM cells, QoS corresponding to the marked 2, the newly received n + 1-th ATM cell corresponding QoS label 3 ; n_m then buffered ATM cells and transmitted in a cascade PW encapsulated packet, the QoS tag PW PSN transport header packet is 2, or both the PSN transport packet header PW QoS QoS tag portion and PW packet header labeled 2; cascade after encapsulation nm ATM cells, or other suitable timing, caching the n + 1 th ATM cell, the n + 1-th ATM It will be the next cell PW packet concatenation of ATM cells encapsulated I element. 其中,η和m均为正整数,且η兰m。 Wherein, [eta] and m are both positive integers, and blue [eta] m.

[0056] 采用本发明实施例提供的方法,可以在新接收到的ATM信元的优先级与已缓存的ATM信元的优先级相同时,直接缓存新接收的ATM信元;不同时,将已缓存的ATM信元级联封装为PW报文并发送,另外缓存新接收的ATM信元;从而使得本地缓存中已缓存的所有ATM信元的优先级相同,进而保证每个PW报文所包含的所有ATM信元的优先级相同,以使该PW报文的PSN传输头部或PW头部的QoS标记真实反映其所有ATM信元的优先级;解决了现有技术的PW报文中低优先级的ATM信元在PSN传输时的QoS优先级级被提高的问题,从而能够提供更精确的服务质量。 [0056] The method according to an embodiment of the present invention, the same priority, the priority of the buffered ATM cell ATM cells newly received directly cache ATM cells newly received metadata; not the same, the buffered ATM cell concatenation and encapsulated into a PW packet transmission, the ATM cell buffer additionally newly received; priority so that the local cache buffered all ATM cells of the same, thus ensuring that each packet PW all containing the same priority ATM cells, so that the PW packet transport header PSN QoS tag real or PW header which reflects the priorities of all ATM cells; solves the prior art packet PW low priority QoS ATM cell when the priority level is increased PSN transport problems, thereby providing a more accurate service quality. 本发明实施例的QoS保持方法可适用于one to oneATMPWE3信元级联封装以及N to one ATM PWE3信元级联封装。 QoS embodiment of the present invention is applicable to a method of holding one to oneATMPWE3 packaging cell concatenation and N to one ATM PWE3 cell concatenation package.

[0057] 在本发明的另一个实施例中,PE设备缓存新接收的ATM信元具体可以为:将新接收的ATM信元缓存在本地缓存的一个合并缓存子单元中,该合并缓存子单元用于缓存与新接收的ATM信元属于同一条VCC或VPC的ATM信元。 The ATM cell received by the cell buffer a new combination and buffering subunit in the local cache, the cache and the combined sub-unit: [0057] embodiment, the ATM cell buffer PE device may be a newly received In another particular embodiment of the present invention, to buffer the newly received ATM cell belonging to the same ATM cell of a VCC or VPC.

[0058] ATM PWE3的PSN隧道中,可以存在多条VCC,或多条VPC,或多条VCC和VPC,可以为每条VCC或VPC的ATM信元设置一个合并缓存子单元,每一个合并缓存子单元中只缓存一条VCC或VPC的ATM信元。 PSN tunnel [0058] ATM PWE3 in, there may be a plurality of VCC, VPC or more, or a plurality of VCC and VPC, a merge buffer may subunit ATM cell is provided for each of the VCC or VPC, each merge buffer subunit only one ATM cell buffer the VPC or VCC. 这样按VCC或VPC的不同分别缓存新接收的ATM信元,可以提高PE设备的工作效率。 Thus according to the new ATM cell buffers each receiving different VCC or VPC, the PE can improve the efficiency of the device.

[0059] 进一步的,步骤102具体可以为: [0059] Further, step 102 may specifically be:

[0060] 102a、识别新接收的ATM信元所属的VCC或VPC ; [0060] 102a, VCC or VPC ATM identifying the newly received cell belongs;

[0061] 102b、判断本地缓存中用于缓存与新接收的ATM信元属于同一条VCC或VPC的ATM信元的合并缓存子单元中是否有已缓存的ATM信元; [0061] 102b, a local cache for caching is determined with the newly received ATM cell belongs to whether there is buffered ATM cell buffering subunit combined with a VCC or VPC ATM cell in;

[0062] 102c、在合并缓存子单元中有已缓存的ATM信元时,比较新接收的ATM信元对应的QoS标记与合并缓存子单元中已缓存的ATM信元对应的QoS标记是否相同。 When [0062] 102c, there are ATM cells are buffered in the merged cache subunit, QoS marking with the combination and buffering subunit ATM cell comparing newly received corresponding buffered ATM cell corresponding QoS label are the same.

[0063] 本步骤中,在接收到新的ATM信元后,仅与一子缓存中保存的与该新接收的ATM信元属于同一条VCC或VPC的ATM信元比较对应的QoS标记是否相同。 ATM cells [0063] In this step, after receiving a new ATM cell, the ATM cell only saved with a sub buffer with the newly received belong to the same VCC or VPC comparing corresponding QoS label is the same .

[0064] 在某一子缓存单元保存的ATM信元满足发送条件时,仅将该子缓存中的ATM信元级联封装为PW报文后发送,从而该PW报文中的ATM信元不仅优先级相同,且属于同一条VCC或VPC,以提供更精确的服务质量。 When [0064] In the ATM cells stored in a buffer sub-unit satisfies the transmission condition, the only sub-buffer ATM cells after concatenation package PW packet transmission, the ATM cells so that packets only PW the same priority and belonging to the VPC or VCC same, to provide a more accurate service quality.

[0065] 下面采用具体的应用场景例对本发明实施例提供的方法做进一步说明。 [0065] The following embodiments provide a method of the present invention will be further described embodiment uses a specific application scenario.

[0066] 请参考图11,对于one to one ATM PWE3信元级联封装,一条PW只承载一条VCC或VPC,该应用场景可以采用本发明第一个实施例提供的方法。 [0066] Please refer to FIG. 11, one to one ATM PWE3 cell concatenation package, a PW carries only a VCC or the VPC, the application scenario may be a method of first embodiment of the present invention provides uses.

[0067] ATM信元到达PW入口后,首先进入PE设备的优先级获取单元,由优先级获取单元识别该新接收的ATM信元的CLP和业务类型并映射得到对应的QoS标记。 [0067] After the ATM cells to PW inlet, enters the first PE device priority acquisition unit acquires a priority of the ATM cell unit identifies the newly received CLP and the service type and QoS of the mapping corresponding to the mark. 然后ATM信元进入优先级合并缓存单元,判断本地缓存中是否已保存有ATM信元,若没有,则缓存该新接收的ATM信元等待封装发送;若已有缓存的ATM信元,则比较该新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记是否相同,若相同,则缓存该新接收的ATM信元等待封装发送;若不相同,则先将优先级合并缓存单元中已缓存的ATM信元级联封装为PW报文并发送出去之后,再缓存新接收的ATM信元等待封装发送,其中以已缓存的ATM信元对应的QoS标记作为该PW报文的PSN传输头部的QoS标记,或者同时作为该PW报文的PSN传输头部和PW头部的QoS标记。 Then the ATM cell priority merge into the cache unit, determines whether the local cache stored in the ATM cell, if not, the cache newly received ATM cell transmission waiting package; if ATM cells with a buffer, the comparator the newly received ATM cell corresponding QoS label is the same as buffered ATM cell corresponding QoS label, if the same, then the cache newly received ATM cell transmission waiting package; if not the same, the first priority after merging the cache unit has cached concatenation of ATM cells encapsulated into packets and transmitted PW, then buffer ATM cells newly received transmission waiting package, wherein the buffered ATM cell corresponding to the PW packet as QoS label QoS marking PSN transport header of packets, or both as a QoS marker PSN transport header and the PW PW header packet.

[0068] 请参考图12,对于N to one ATM PWE3信元级联封装,一条PW可以承载多条VCC或VPC,该应用场景可以采用本发明第二个实施例提供的方法。 [0068] Please refer to FIG. 12, N to one ATM PWE3 cell concatenation package PW may carry a plurality of the VPC or VCC, the method of the second application scenario may embodiment of the present invention provides use.

[0069] ATM信元到达PW入口后,首先进入PE设备的优先级获取单元,由优先级获取单元识别该新接收的ATM信元的CLP和业务类型并映射得到对应的QoS标记。 [0069] After the ATM cells to PW inlet, enters the first PE device priority acquisition unit acquires a priority of the ATM cell unit identifies the newly received CLP and the service type and QoS of the mapping corresponding to the mark. 然后ATM信元进入优先级合并缓存单元。 Then the ATM cell priority merge into the cache unit. 需要说明的是,对于每一条VCC或VPC,可以设置一个独立的优先级合并缓存子单元,新接收的ATM信元分别进入相应的优先级合并缓存子单元。 Note that for each VCC or VPC, may be provided a separate sub-unit cache priority combination, ATM cells newly received respectively merge into the corresponding priority sub-unit cache. 识别新接收ATM信元的VCC或VPC,判断对应于该条VCC或VPC的优先级合并缓存子单元中是否已保存有与新接收的ATM信元属于同一条VCC或VPC的ATM信元,若没有,则缓存该新接收的ATM信元等待封装发送;若已有缓存的ATM信元,则比较该新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记是否相同,若相同,则缓存该新接收的ATM信元等待封装发送;若不相同,则先将该优先级合并缓存子单元中已缓存的ATM信元级联封装为PW报文并发送出去之后,再缓存新接收的ATM信元等待封装发送,其中以已缓存的ATM信元对应的QoS标记作为该PW报文的PSN传输头部的QoS标记,或者同时作为PSN传输头部和PW头部的QoS标记。 Whether the priority merge buffer identifying sub-unit of a newly received ATM cell VPC or VCC, or VCC is determined corresponding to the entry is stored in the VPC and the newly received ATM cell belonging to the same ATM cell VPC or VCC, if not, the cache to the new ATM cell received transmission waiting package; if there is an ATM cell corresponding to the ATM QoS label cache element, then comparing the newly received QoS label buffered ATM cell is the same as the corresponding If the same, then the cache of the newly received ATM cell transmission waiting package; if not the same, the first priority of the combined sub-unit cache buffered ATM cell concatenation PW packet is encapsulated and sent later, cache then the newly received ATM cell transmitted cells waiting package, wherein the buffered ATM cell corresponding QoS QoS label as the labeled PW PSN transport header packet, or is used as a head PSN transport header and the PW QoS marking. [0070] 请参考图13,对于N to one ATM PWE3信元级联封装的应用场景,也可以无需考虑ATM信元的是否属于同一条VCC或VPC,而采用本发明第一个实施例提供的方法。 [0070] Please refer to FIG. 13, the application scenario N to one ATM PWE3 cell concatenation of the package, may be no need to consider whether the ATM cell belonging to the VPC or VCC same, while the use of a first embodiment of the present invention is provided method. 即:PE设备可以只设置一个优先级合并缓存单元,而不用按VCC或VPC的不同设置多个优先级合并缓存子单元。 Namely: PE device may be provided only one cache priority merge unit, without providing a plurality of different priority VCC or VPC combined buffering subunit.

[0071] ATM信元到达PW入口后,首先进入PE设备的优先级获取单元,由优先级获取单元识别该新接收的ATM信元的CLP和业务类型并映射得到对应的QoS标记。 [0071] After the ATM cells to PW inlet, enters the first PE device priority acquisition unit acquires a priority of the ATM cell unit identifies the newly received CLP and the service type and QoS of the mapping corresponding to the mark. 然后ATM信元进入优先级合并缓存单元,判断本地缓存中是否已保存有ATM信元,若没有,则缓存该新接收的ATM信元等待封装发送;若已有缓存的ATM信元,则比较该新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记是否相同,若相同,则缓存该新接收的ATM信元等待封装发送;若不相同,则先将优先级合并缓存单元中已缓存的ATM信元级联封装为PW报文并发送出去之后,再缓存新接收的ATM信元等待封装发送,其中以已缓存的ATM信元对应的QoS标记作为该PW报文的PSN传输头部的QoS标记,或者同时作为PSN传输头部和PW头部的QoS标记。 Then the ATM cell priority merge into the cache unit, determines whether the local cache stored in the ATM cell, if not, the cache newly received ATM cell transmission waiting package; if ATM cells with a buffer, the comparator the newly received ATM cell corresponding QoS label is the same as buffered ATM cell corresponding QoS label, if the same, then the cache newly received ATM cell transmission waiting package; if not the same, the first priority after merging the cache unit has cached concatenation of ATM cells encapsulated into packets and transmitted PW, then buffer ATM cells newly received transmission waiting package, wherein the buffered ATM cell corresponding to the PW packet as QoS label QoS PSN transport header text label, or is used as QoS labels PSN transport header and a PW header.

[0072] 请参考图14,本发明实施例还提供一种运营商边缘PE设备,应用于使用级联封装的ATM PWE3,该PE设备包括:优先级获取单元201,处理单元202,合并缓存单元203,和封装发送单元204 ;其中, [0072] Please refer to FIG 14, embodiments of the present invention further provides a provider edge PE device, applied using a cascade encapsulated ATM PWE3, the PE device comprising: a priority obtaining unit 201, a processing unit 202, buffer unit merged 203, the transmission unit 204 and the package; wherein,

[0073] 优先级获取单元201,用于识别新接收的异步传输模式ATM信元的信元丢弃优先级CLP和业务类型,根据CLP和业务类型得到对应的服务质量QoS标记; [0073] The priority acquiring unit 201, for identifying the asynchronous transfer mode ATM cells newly received cell loss priority CLP and the service type, QoS and service type flag CLP corresponding to the service according to the quality obtained;

[0074] 处理单元202,用于判断合并缓存单元203中是否已存储有ATM信元,如果有,则比较新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记是否相同,如果相同,则指令合并缓存单元203缓存新接收的ATM信元;如果不同,则指令封装发送单元204对存储在合并缓存单元中的ATM信元进行封装发送,并指令合并缓存单元203缓存新接收的ATM信元; [0074] The processing unit 202 is configured to merge the cache unit 203 determines whether the ATM cell is stored, if any, are more ATM cells corresponding to the newly received QoS label buffered ATM cell corresponding to whether the QoS label same, if the same, then the instruction ATM cell merge buffer unit 203 buffers a newly received; If not, the instruction ATM cell assembling transmitting unit 204 is stored in the merge buffer unit encapsulates the transmission, and instructs the merge buffer unit 203 buffers element newly received ATM cell;

[0075] 合并缓存单元203,用于根据处理单元202的指令缓存新接收的ATM信元; [0075] The combined buffering unit 203 for buffering the ATM cells newly received metadata processing unit 202 in accordance with an instruction;

[0076] 封装发送单元204,用于根据处理单元202的指令,将已缓存在合并缓存单元203中的ATM信元级联封装在伪线PW报文中并发送PW报文,其中以已缓存的ATM信元对应的QoS标记作为该PW报文的分组交换网络PSN传输头部的QoS标记,或者同时作为该PW报文的PSN传输头部和PW头部的QoS标记。 [0076] The package unit 204 transmits, according to the instruction processing unit 202 will be cached in the cache unit 203 consolidated ATM cell concatenation of encapsulating and transmitting packets PW pseudo-wire PW packets, which have been cached ATM cells as packets corresponding to the QoS label PW packet switching network PSN transport QoS marking head, or at the same time as the PW QoS tag PSN transport header packet header and PW.

[0077] 请参考图15,合并缓存单元202可以进一步包括至少一个合并缓存子单元,每个合并缓存子单元用于缓存一条VCC或VPC的ATM信元。 [0077] Please refer to FIG. 15, the cache merging unit 202 may further include at least one subunit merge buffer, each buffer for buffering subunit merging a VCC or VPC ATM cells.

[0078] 一个实施例中,处理单元202,具体用于识别新接收的ATM信元所属的VCC或VPC ;判断用于缓存与新接收的ATM信元属于同一条VCC或VPC的ATM信元的合并缓存子单元中是否有已缓存的ATM信元,如果有,则比较新接收的ATM信元对应的QoS标记与合并缓存子单元中已缓存的ATM信元对应的QoS标记是否相同;如果相同,则指令合并缓存子单元缓存新接收的ATM信元;如果不同,则指令封装发送单元204对存储在合并缓存子单元中的ATM信元进行封装发送,并指令合并缓存子单元新接收的ATM信元。 [0078] In one embodiment, the processing unit 202, particularly for an ATM VCC or VPC recognition of the newly received cell belongs; Analyzing for caching of ATM cells belonging to the newly received ATM cells with a VCC or a VPC are there ATM cells buffered merged cache sub-units, if any, QoS marking with the combination and buffering subunit ATM cell corresponding to the relatively new received buffered ATM cell corresponding QoS label are the same; if the same , the instruction combination and buffering subunit cache ATM cell newly received; If not, the instruction ATM cell assembling transmitting unit 204 is stored in the merge buffer subunit encapsulates the transmission, and instructs the combination and buffering subunit newly received ATM cell.

[0079] 一个实施例中,处理单元202,还用于在判断合并缓存单元203中没有存储有ATM信元时,指令合并缓存单元203缓存新接收的ATM信元。 When [0079] In one embodiment, the processing unit 202 is further configured to merge the cache is not stored in the judging unit 203 has an ATM cell, combined instruction cache unit 203 caches the newly received ATM cell.

[0080] 一个实施例中,处理单元202,还用于在指令合并缓存单元203缓存新接收的ATM信元之后,判断存储在合并缓存单元203中的ATM信元是否满足发送条件,若是,则指令封装发送单元204对存储在缓存单元中的ATM信元进行封装发送。 After [0080] In one embodiment, the processing unit 202 is further configured to merge the cache instruction cache unit 203 the newly received ATM cell, the ATM cells stored in the merged cache determination unit 203 meets a transmission condition, and if yes, encapsulating the ATM cell transmission instruction unit 204 is stored in the buffer unit transmits encapsulated.

[0081] 采用本发明实施例提供的PE设备,可以在新接收到的ATM信元的优先级与已缓存的ATM信元的优先级相同时,直接缓存新接收的ATM信元;不同时,将已缓存的ATM信元级联封装为PW报文并发送,另外缓存新接收的ATM信元;从而使得本地缓存中已缓存的所有ATM信元的优先级相同,进而保证每个PW报文所包含的所有ATM信元的优先级相同,以使该PW报文的PSN传输头部或PW头部的QoS标记真实反映其所有ATM信元的优先级;解决了现有技术的PW报文中低优先级的ATM信元在PSN传输时的QoS优先级级被提高的问题,从而能够提供更精确的服务质量。 [0081] The PE device according to an embodiment of the present invention, the same priority, the priority of the buffered ATM cell ATM cells newly received directly cache ATM cells newly received metadata; not the same, the buffered ATM cell concatenation and encapsulated into a PW packet transmission, the ATM cell buffer additionally newly received; priority so that the local cache buffered all ATM cells of the same, thus ensuring each packet PW All the same ATM cell contains priority, so that the PW packet transport header PSN QoS tag real or PW header which reflects the priorities of all ATM cells; solves the prior art packet PW low-priority ATM cells QoS priority level when the transmission is increased PSN problem, it is possible to provide a more accurate service quality.

[0082] 请参考图9,本发明实施例还提供一种ATM PWE3系统,至少包括用户边缘CE设备CEl和CE2和运营商边缘PE设备PEl和PE2 ;PE1通过ATM接口和CEl连接,PE2通过ATM接口和CE2连接,PSN网络中建立有联通PEl和PE2的PWE3伪线。 [0082] Please refer to FIG. 9, the embodiment of the present invention provides a further embodiment the PWE3 ATM system, comprising at least a customer edge device CEl and CE2 CE and provider edge PE devices PEl and PE2; PE1 is connected via an ATM interface and CEl, PE2 through the ATM and CE2 connected to the interface, Unicom PEl and PE2 establish the PSN PWE3 pseudo wire network. CEl与CE2的通信为:首先CEl发送ATM信元给PEl,PEl将收到的ATM信元封装为PW报文后沿着PWE3伪线发送给PE2,PE2将PW报文解封装后,将获得的ATM信元发送给CE2 ;反之从CE2发送ATM信元给CEl的过程亦同。 CEl and CE2 communication: first CEl transmitting ATM cells to PEl, PEl the received ATM cells after the package is sent to PE2 PW packet along PWE3 pseudo wire, PW after PE2 decapsulates the packet and obtain the ATM cells transmitted to CE2; and vice versa during transmission of the ATM cells to likewise from CEl CE2. 具体的, specific,

[0083] CE设备,用于发送异步传输模式ATM信元给与之相连的PE设备; [0083] CE device for sending asynchronous transfer mode ATM cells to the PE device connected thereto;

[0084] PE设备,用于接收CE设备发送的ATM信元并识别新接收的ATM信元的信元丢弃优先级CLP和业务类型,根据CLP和业务类型得到对应的服务质量QoS标记;在本地缓存中有已缓存的ATM信元时,比较新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记是否相同;如果相同,缓存新接收的ATM信元;如果不同,将已缓存的ATM信元级联封装在伪线PW报文中并发送,其中以已缓存的ATM信元对应的QoS标记作为该PW报文的分组交换网络PSN传输头部的QoS标记,或者同时作为PSN传输头部和PW头部的QoS标记,并缓存新接收的ATM信元。 [0084] PE device for receiving ATM cells transmitted from CE device and identifies the ATM cell loss priority newly received CLP and the service type, quality of service QoS to give the corresponding CLP and labeled according to the service type; locally when the cache of the ATM cell has been buffered, the ATM cells corresponding QoS tag comparison newly received and buffered ATM cell corresponding QoS label are the same; if identical, the ATM buffer the newly received metadata; if different, the buffered ATM cell concatenation of encapsulating and transmitting the pseudo-wire PW packet, wherein the buffered ATM cell corresponding to the QoS label as PW packet QoS marking packet switched network PSN transport header, or At the same time as the QoS tag PSN transport header and a PW header, and buffering newly received ATM cell.

[0085] CE设备还可以用于接收从与之相连的PE设备发送来的ATM信元; [0085] CE device may also be used therewith received from the ATM transmission device connected to the PE element;

[0086] PE设备同样还可以用于对收到的PW报文进行解析,获得对应的ATM信元,并发送给与之相连的CE设备。 [0086] PE can also be used for the same device PW resolve the received packet, to obtain the corresponding ATM cell and sent to the CE device connected thereto.

[0087] 本实施例涉及的PE设备为前述实施例中的PE设备,在此不再赘述。 [0087] The embodiment according to the present embodiment the PE is PE device in the foregoing embodiment embodiment, not described herein again.

[0088] 本发明实施例提供的系统,可以在新接收到的ATM信元的优先级与已缓存的ATM信元的优先级相同时,直接缓存新接收的ATM信元;不同时,将已缓存的ATM信元级联封装为PW报文并发送,另外缓存新接收的ATM信元;从而使得本地缓存中已缓存的所有ATM信元的优先级相同,进而保证在PE间传送的每个PW报文所包含的所有ATM信元的优先级相同,以使该PW报文的PSN传输头部或PW头部的QoS标记真实反映其所有ATM信元的优先级;解决了现有技术的PW报文中低优先级的ATM信元在PSN传输时的QoS优先级级被提高的问题,从而能够提供更精确的服务质量。 [0088] system provided by the embodiment of the present invention, the priority is the priority of the buffered ATM cell ATM cells newly received at the same time, the direct buffer ATM cells newly received metadata; not the same, which has been buffered ATM cell concatenation and encapsulated into a PW packet transmission, the ATM buffer the newly received additional metadata; priority so that the local cache buffered all ATM cells of the same, thereby ensuring the transfer between each PE PW same packet included in all ATM cells of priority, such that QoS marking real PSN transport header of the PW or PW header packet which reflects the priorities of all ATM cells; solves the prior art PW packets and low priority QoS ATM cell when the priority level is increased PSN transport problems, thereby providing a more accurate service quality.

[0089] 本领域普通技术人员可以意识到,结合本文中所公开的实施例描述的各示例的单元及算法步骤,能够以电子硬件如计算机处理器、CPU,计算机软件或者二者的结合来实现,为了清楚地说明硬件和软件的可互换性,在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。 [0089] Those of ordinary skill in the art can appreciate that any means disclosed herein and algorithm steps described exemplary embodiments, can be implemented as electronic hardware, CPU, computer software, or a combination of both a computer processor to clearly illustrate this interchangeability of hardware and software, in accordance with the foregoing has generally described functional components and steps of each example. 这些功能究竟以硬件还是软件方式来执行,取决于技术方案的特定应用和设计约束条件。 Whether these functions are performed by hardware or software depends upon the particular application and design constraints of the technical solutions. 专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本发明的范围。 Professional technical staff may use different methods for each specific application to implement the described functionality, but such implementation should not be considered outside the scope of the present invention.

[0090] 结合本文中所公开的实施例描述的方法或算法的步骤可以用硬件、处理器执行的软件模块,或者二者的结合来实施。 [0090] The steps of a method or algorithm described in the embodiments disclosed herein may be implemented in hardware, or a combination thereof, in a software module executed by a processor to implement. 软件模块可以置于随机存储器(RAM)、内存、只读存储器(ROM)、电可编程ROM、电可擦除可编程ROM、寄存器、硬盘、可移动磁盘、CD-ROM、或技术领域内所公知的任意其它形式的存储介质中。 A software module may be placed in a random access memory (RAM), a memory, a read only memory (ROM), electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, CD-ROM, or within the technical field known any other form of storage medium. 以上对本发明实施例所提供的服务质量QoS保持方法和运营商边缘PE设备以及ATM PWE3系统进行了详细介绍,本文中应用了具体个例对本发明的原理及实施方式进行了阐述,以上实施例的说明只是用于帮助理解本发明的方法及其核心思想,不应理解为对本发明的限制。 Quality of Service embodiments presented in the foregoing embodiment of the present invention QoS holding method and a provider edge PE device and ATM PWE3 systems are described in detail herein through specific examples of the principles and embodiments of the invention are set forth in the above embodiments Description only used to help understand the method and core ideas of the present invention is not to be construed as limiting the present invention.

Claims (11)

  1. 1.一种服务质量QoS保持方法,其特征在于,包括: 运营商边缘PE设备识别新接收的异步传输模式ATM信元的信元丢弃优先级CLP和业务类型,根据所述CLP和业务类型得到对应的服务质量QoS标记; 在本地缓存中有已缓存的ATM信元时,比较所述新接收的ATM信元对应的QoS标记与所述已缓存的ATM信元对应的QoS标记是否相同; 如果相同,缓存所述新接收的ATM信元; 如果不同,将所述已缓存的ATM信元级联封装在伪线PW报文中并发送,其中以所述已缓存的ATM信元对应的QoS标记作为该PW报文的分组交换网络PSN传输头部的QoS标记,或者同时作为该PW报文的PSN传输头部和PW头部的QoS标记,并缓存所述新接收的ATM信元。 A method for maintaining the quality of service QoS, characterized by comprising: a provider edge PE device identifying ATM ATM cells newly received cell loss priority CLP and the service type, and to obtain the service type according to the CLP corresponding to the QoS tag; when the ATM cell has been cached in the local cache, comparing the QoS label corresponding to the ATM cells newly received buffered ATM cell corresponding QoS label; if they same, buffering the newly received ATM cell; if different, the buffered ATM cell concatenation of encapsulating and transmitting the pseudo-wire PW packet in which the ATM cell has been buffered corresponding to the QoS the flag PW packet as a packet switching network PSN transport QoS marking head, or at the same time as the PW QoS tag PSN transport header packet header and PW, and buffering the newly received ATM cell.
  2. 2.根据权利要求1所述的方法,其特征在于,所述根据所述CLP和业务类型得到对应的服务质量QoS标记之后还包括: 在本地缓存中没有缓存的ATM信元时,缓存所述新接收的ATM信元。 2. The method according to claim 1, wherein, after said obtaining the corresponding quality of service QoS label further comprising the CLP and the service type: when not cached in the local cache of the ATM cell, the buffer the newly received ATM cell.
  3. 3.根据权利要求1或2所述的方法,其特征在于,所述缓存所述新接收的ATM信元具体为: 将所述新接收的ATM信元缓存在本地缓存的一个合并缓存子单元中,所述的合并缓存子单元用于缓存与所述新接收的ATM信元属于同一条虚电路连接VCC或虚通道连接VPC的ATM信元。 3. The method of claim 1 or claim 2, wherein said buffering the newly received ATM cell element is specifically: the ATM cell of the received cell buffer a new combination and buffering subunit locally cached , the combined sub-unit is configured to buffer cache with the newly received ATM cell belongs to the same virtual circuit connection or VCC ATM cell virtual path connections VPC's.
  4. 4.根据权利要求3所述的方法,其特征在于,所述在本地缓存中有已缓存的ATM信元时,比较所述新接收的ATM信元对应的QoS标记与所述已缓存的ATM信元对应的QoS标记是否相同包括: 识别所述新接收的ATM信元所属的VCC或VPC ; 判断用于缓存与所述新接收的ATM信元属于同一条VCC或VPC的ATM信元的合并缓存子单元中是否有已缓存的ATM信元; 在所述合并缓存子单元中有已缓存的ATM信元时,比较所述新接收的ATM信元对应的QoS标记与所述合并缓存子单元中已缓存的ATM信元对应的QoS标记是否相同。 4. The method according to claim 3, characterized in that, there is the buffered ATM cell, the comparison with the QoS label corresponding to the ATM cells newly received ATM cached in the local cache QoS label corresponding cell is the same comprising: an ATM VCC or VPC recognition of the newly received cell belongs; Analyzing for caching the received ATM cell belonging to the new merged with a VCC or a VPC ATM cells is there a buffered ATM cell buffer subunit; merge buffer sub-unit in the ATM cell has been buffered, comparing the new ATM cell corresponding to the received QoS label combination and buffering subunit in buffered ATM cell corresponding QoS label are the same.
  5. 5.根据权利要求1或2所述的方法,其特征在于,所述如果相同,缓存所述新接收的ATM信元之后还包括: 判断本地缓存的ATM信元是否满足发送条件,若是,将所述本地缓存的ATM信元级联封装在伪线PW报文中并发送,其中以所述本地缓存的ATM信元对应的QoS标记作为该PW报文的PSN传输头部的QoS标记,或者同时作为PSN传输头部和PW头部的QoS标记。 5. The method of claim 1 or claim 2, wherein, if the same buffer the newly received ATM cell further comprises: determining whether the locally buffered ATM cell transmission condition satisfied, if yes, the local cache concatenation of ATM cells encapsulated in a pseudo-wire PW and transmit packets, wherein the ATM cells corresponding to the local cache tag QoS QoS label as the PW packet PSN transport header, or At the same time as the labeled QoS PSN transport header and a PW header.
  6. 6.一种运营商边缘PE设备,其特征在于,包括: 优先级获取单元,用于识别新接收的异步传输模式ATM信元的信元丢弃优先级CLP和业务类型,根据所述CLP和业务类型得到对应的服务质量QoS标记; 处理单元,用于判断合并缓存单元中是否已存储有ATM信元,如果有,则比较新接收的ATM信元对应的QoS标记与已缓存的ATM信元对应的QoS标记是否相同,如果相同,则指令所述合并缓存单元缓存所述新接收的ATM信元;如果不同,则指令封装发送单元对存储在所述合并缓存单元中的ATM信元进行封装发送,并指令所述合并缓存单元缓存所述新接收的ATM信元;合并缓存单元,用于根据所述处理单元的指令,缓存所述新接收的ATM信元; 封装发送单元,用于根据所述处理单元的指令,将所述已缓存在所述合并缓存单元中的ATM信元级联封装在伪线PW报文中并发送,其中以所述已缓 A provider edge PE device, characterized by comprising: a priority obtaining unit, configured to identify ATM cells newly received ATM cell loss priority CLP and the service type, and service according to the CLP to give the corresponding type of quality of service QoS label; a processing unit configured to determine whether the merge buffer unit stores the ATM cell, if so, comparing ATM cell corresponding QoS label corresponding to the newly received ATM cell buffered QoS markings are the same, if the same, then the combined instruction buffer unit to buffer the newly received ATM cell element; If not, the instruction transmitting unit package stored in the consolidated ATM cell buffer unit transmits encapsulated and instructs the consolidated ATM cell buffer unit to buffer the newly received; combined buffering unit, according to an instruction for the processing unit, the cache newly received ATM cell; packaging transmitting unit configured in accordance with the said instruction processing unit, the cached in the merge buffer unit concatenation of ATM cells encapsulated in a pseudo-wire PW and transmit packets, wherein said eased to 存的ATM信元对应的QoS标记作为该PW报文的分组交换网络PSN传输头部的QoS标记,或者同时作为该PW报文的PSN传输头部和PW头部的QoS标记。 Stored ATM cells as packets corresponding to the QoS label PW packet switching network PSN transport QoS marking head, or at the same time as the PW QoS tag PSN transport header packet header and PW.
  7. 7.根据权利要求6所述的PE设备,其特征在于: 所述合并缓存单元包括至少一个个合并缓存子单元,每个合并缓存子单元用于缓存一条VCC或VPC的ATM信元。 7. PE apparatus according to claim 6, wherein: said merge buffer unit comprises at least one combination and buffering subunit, each subunit combined cache for caching a VCC or VPC ATM cells.
  8. 8.根据权利要求7所述的PE设备,其特征在于: 所述处理单元,具体用于识别所述新接收的ATM信元所属的VCC或VPC ;判断用于缓存与所述新接收的ATM信元属于同一条VCC或VPC的ATM信元的合并缓存子单元中是否有已缓存的ATM信元,如果有,则比较所述新接收的ATM信元对应的QoS标记与所述合并缓存子单元中已缓存的ATM信元对应的QoS标记是否相同;如果相同,则指令所述合并缓存子单元缓存所述新接收的ATM信元;如果不同,则指令封装发送单元对存储在所述合并缓存子单元中的ATM信元进行封装发送,并指令所述合并缓存子单元缓存所述新接收的ATM信元。 PE device according to claim 7, wherein: the processing unit, particularly the VPC or VCC for identifying the ATM cells newly received belongs; Analyzing for caching with the newly received ATM is there a buffered ATM cell buffering subunit combined with a cell belonging to the VCC or VPC in the ATM cell, if so, comparing the new ATM cell corresponding to the received QoS marking with the combined sub-cache cell buffered ATM cell corresponding QoS label; if they are the same, the combined instruction cache subunit said ATM buffer the newly received metadata; If not, the instruction transmitting unit package incorporated in said stored ATM cell buffer subunits encapsulated transmission, and instructs the sub-unit cache buffer merge the newly received ATM cell.
  9. 9.根据权利要求6所述的PE设备,其特征在于: 所述处理单元,还用于在判断合并缓存单元中没有存储有ATM信元时,指令所述合并缓存单元缓存所述新接收的ATM信元。 9. The PE device according to claim 6, wherein: the processing unit is further configured to merge determination is not stored in the cache unit contains ATM cells, the combined instruction buffer unit to buffer the newly received ATM cells.
  10. 10.根据权利要求6或9所述的PE设备,其特征在于: 所述处理单元,还用于在指令所述合并缓存单元缓存所述新接收的ATM信元之后,判断存储在所述合并缓存单元中的ATM信元是否满足发送条件,若是,则指令所述封装发送单元对存储在所述合并缓存单元中的ATM信元进行封装发送。 10. PE of claim 6 or claim 9, wherein: after said processing unit further instructions for merging the buffer unit to buffer the newly received ATM cell, it is determined in said storage consolidation whether the ATM cell buffer unit satisfies the transmission condition, and if yes, the instruction transmitting unit encapsulating ATM cells stored in the merge buffer unit transmits encapsulated.
  11. 11.一种异步传输模式端到端伪线仿真ATM PWE3系统,其特征在于,包括:用户边缘CE设备和运营商边缘PE设备; 所述CE设备,用于发送异步传输模式ATM信元给与之相连的所述PE设备; 所述PE设备,用于接收所述CE设备发送的ATM信元并识别新接收的ATM信元的信元丢弃优先级CLP和业务类型,根据所述CLP和业务类型得到对应的服务质量QoS标记;在本地缓存中有已缓存的ATM信元时,比较所述新接收的ATM信元对应的QoS标记与所述已缓存的ATM信元对应的QoS标记是否相同;如果相同,缓存所述新接收的ATM信元;如果不同,将所述已缓存的ATM信元级联封装在伪线PW报文中并发送,其中以所述已缓存的ATM信元对应的QoS标记作为该PW报文的分组交换网络PSN传输头部的QoS标记,或者同时作为该PW报文的PSN传输头部和PW头部的QoS标记,并缓存所述新接收的ATM信元。 An ATM end the PWE3 ATM pseudowire emulation system comprising: a customer edge CE device and provider edge PE device; and the CE device, for transmitting asynchronous transfer mode ATM cells to give the equipment connected to PE; PE the apparatus, the cell for the ATM cells received ATM cell transmitting CE device and identifies the newly received loss priority CLP and the service type, and service according to the CLP to give the corresponding type of quality of service QoS label; when the ATM cell has been cached in the local cache, comparing the QoS label corresponding to the ATM cells newly received buffered ATM cell is the same as the corresponding QoS label ; If so, a new buffer the received ATM cell; if different, the buffered ATM cell concatenation of encapsulating and transmitting the pseudo-wire PW packet, wherein the ATM cell to corresponding cached the QoS label as the labeled PW packet QoS packet switched network PSN transport header, or is used as QoS labels PW packet header and a PW PSN transport header, and buffering the newly received ATM cell .
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WO2001031854A1 (en) * 1999-10-27 2001-05-03 Samsung Electronics Co., Ltd. Apparatus and method for providing guaranteed frame rate service in atm switch
CN101488914A (en) * 2009-01-06 2009-07-22 杭州华三通信技术有限公司 Quality of service implementing method and provide edge equipment
CN102137008A (en) * 2011-01-24 2011-07-27 华为技术有限公司 Quality of service (QoS) keeping method, device and system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001031854A1 (en) * 1999-10-27 2001-05-03 Samsung Electronics Co., Ltd. Apparatus and method for providing guaranteed frame rate service in atm switch
CN101488914A (en) * 2009-01-06 2009-07-22 杭州华三通信技术有限公司 Quality of service implementing method and provide edge equipment
CN102137008A (en) * 2011-01-24 2011-07-27 华为技术有限公司 Quality of service (QoS) keeping method, device and system

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