CN101501451B - Ap本地动态交换 - Google Patents

Ap本地动态交换 Download PDF

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CN101501451B
CN101501451B CN200780029623.XA CN200780029623A CN101501451B CN 101501451 B CN101501451 B CN 101501451B CN 200780029623 A CN200780029623 A CN 200780029623A CN 101501451 B CN101501451 B CN 101501451B
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詹姆斯·墨菲
加里·玛瑞恩
斯特丹·切斯纳特
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Juniper Networks Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H04W84/22—Self-organising networks, e.g. ad-hoc networks or sensor networks with access to wired networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/082—Mobility data transfer for traffic bypassing of mobility servers, e.g. location registers, home PLMNs or home agents
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/14—Backbone network devices

Abstract

一种用于实现AP本地动态交换的技术涉及层2交换。这可以通过向AP提供与无线终端相关的数据以使得该AP能够判断是否应对来自特定的无线终端的业务进行本地交换来实现。可选地，无线终端可能能够基于业务自身来判断是否对该业务进行本地交换。例如，可能希望对语音业务进行AP本地交换，以避免对诸如IP语音的语音传输特别有害的延迟。不进行本地交换的业务被层2隧道上行。

Description

AP本地动态交换
背景技术
接入点(access point，AP)是无线客户端用来连接至网络的装置。AP在一些实现中作为独立的实体起作用，而在其它实现中与分布式硬件合作起作用。分布式硬件可以包括用来管理AP并提供至无线客户端的网络连接的无线交换机。无线域可以指用于交换相关信息并利用这些信息做出知情决策(informeddecision)的无线交换机组。公知的装置是作为网络无线设备的一部分的终端(station)(例如，无线AP或客户端装置)。 
卓思网络公司(Trapeze)在移动域(MOBILITY DOMAINTM)无线域中使用移动点(MOBILITY 
Figure G200780029623XD00011
Figure G200780029623XD00012
)AP。 
Figure G200780029623XD00013
AP连接至移动交换(MOBILITY 
Figure G200780029623XD00014
Figure G200780029623XD00015
)无线交换机。Trapeze使用MOBILITY DOMAINTM来指 
Figure G200780029623XD00016
交换机的集群(collection)。该 交换机的集群共享RF环境和终端相关信息。该信息被 
Figure G200780029623XD00018
交换机用来支持包括例如但不限于漫游、自动信道选择、伪装AP检测、入侵检测和/或对策发布(launchingof countermeasure)的特征。在本申请要求优先权的临时申请中，通过例如但不限于包括本申请后面所讨论的新颖特征来提供一些关于Trapeze具体实现的补充细节。 
在典型实现中，正如可以预料的，通过交换机来进行交换。然而，还可能在AP处进行本地交换。利用集中控制协调AP本地交换不是一个小问题。提供混合交换，即在AP本地进行交换与在交换机处进行交换相结合，也不是一个小问题。 
这些仅是与无线接入点认证相关的课题和问题的子集，并且旨在通过示例的方式来表征现有技术的缺点。现有技术的前述示例以及与其相关的局限旨在说明而不是排外的。对于本领 域技术人员来说，在阅读本说明书以及研究附图之后，现有技术的其它局限将变得显而易见。 
发明内容
本发明内容用来以简化方式介绍下文在具体实施方式中所进一步描述的概念的选取。本发明内容无意确定所要求保护的主题的关键特征或必要特征，也无意用来限制所要求保护的主题的范围。 
一种用于实现AP本地动态交换的技术涉及层2(Layer 2)交换。这可以通过向AP提供与无线终端相关的数据以使得该AP能够判断是否应对来自特定无线终端的业务进行本地交换来实现。可选地，无线终端可能能够基于业务自身来判断是否对该业务进行本地交换。例如，可能希望对语音业务进行AP本地交换，以避免对诸如IP语音(voice-over IP)的语音传输特别有害的延迟。不进行本地交换的业务被层2隧道上行(upstream)。 
在其它优点中，所提出的系统可以提供有效利用带宽、减少延迟、提高网络效率和可靠性。对于本领域技术人员来说，在阅读下面的说明以及研究附图中的一些图之后，这里所描述的技术的优点以及其它优点将变得清楚。 
附图说明
在附图中示出了所要求保护的主题的实施例。然而，这些实施例和附图是说明性的而不是限定性的；它们提供所要求保护的主题的示例。 
图1描述了包括无缆接入点(untethered access point，UAP)网的系统的示例。 
图2描述了AP本地动态交换系统的示例。 
图3A至图3D描述了当判断是在AP处进行本地交换还是在交换机处进行交换时可以考虑的各种因素的示例，但不限于这些因素。 
图4描述了能够进行AP本地动态交换的AP的示例。 
图5描述了用于AP本地动态交换的方法的示例的流程图。 
具体实施方式
在下面的说明中，给出一些具体细节来提供对所要求保护的主题的实施例的全面了解。然而，相关领域的技术人员能认识到所要求保护的主题可以实施为不具有这些具体细节中的一个或多个，或者实施为结合有其它组件等。在其它示例中，没有详细示出或描述公知的实现或操作，以避免搞混所要求保护的主题的各种实施例的方面。 
图1描述了包括无缆接入点(UAP)网的系统100的示例。在图1的示例中，系统100包括网络102、无线交换机104、一个或多个AP 106-1至106-N(统称为AP 106)以及UAP网108。应注意到，虽然重叠交换模型(overlay switching model)在一些方式上替换为本文所描述的技术，但可能希望本地交换的实现不去除重叠模型的任何功能。 
重叠交换模型包括提供隧道至上行交换机(例如， 
Figure G200780029623XD00031
)的AP，使得该交换机能够本地执行复杂的策略和转发决策。至上行交换机的集中交换已使得AP交换代码能够保持相对简单(支持瘦AP模型(Thin-AP model))。AP至少知道其位于上行交换机能够到达的子网上。重叠模型的优点包括：保持AP代码和配置简单；允许在将AP连接至上行交换机的任意接入网络上配置无线网络(由于客户端业务是隧道传输的，它看不到接入网络，因此AP上的终端能够位于与AP可用的LAN完全不同的LAN上)； 以及交换机可以在它们之间形成隧道并在这些隧道中发送客户端业务，以进一步扩展任何AP上的任何给定客户端可能加入的VLAN的选择。然而，重叠网络具有下列缺点：所有的业务必须经过上行交换机，而该上行交换机可能离AP非常远；涉及隧道传输业务时的MTU和其它中间盒(middle box)问题的复杂性；以及没有利用在AP处可用的分布式转发计算能力(一般来说，将转发问题推至边缘尺度(edge scale)的设计比较好)。 
网络102可以包括因特网协议(IP)网络。在实施例中，网络102是连接无线交换机104的有线骨干网。然而，可选地，网络102可以表示这种网络，或者表示连接骨干网或作为骨干网替代的任何其它网络。因此，网络102可以包括例如因特网。 
典型地，无线交换机104有线连接至AP 106。因此，“无线”交换机可依赖于实现而被认为是用于到达有线网络和/或来自有线网络的无线业务的交换机。无线交换机104不是必须无线连接至任何地方。各AP 106能够以使得各交换机仅有线连接至单个AP的方式来有线连接至各个交换机。因此，尽管在图1的示例中将一个或多个AP 106描述为多个，但应理解，每个交换机的AP数量与具体的实现和/或实施方式有关。AP和无线交换机104可以组合在单个装置中。然而，在本说明书中，AP的功能有别于交换机的功能，就好像AP和无线交换机是截然不同的装置而工作。 
无线交换机104可能具有或不具有用以本地管理无线终端和UAP网的所有工具。例如，可能存在从无线交换机104进一步上行的附加管理(例如AAA服务器)。由于这些服务发生在无线交换机104之外的情况不是关键，因此为了简化说明，假定无线交换机104本地或者通过利用上行组件来处理所有这些功能。由于上述原因，附图(除了图1之外)没有描述从无线交换机104进 一步上行的组件。 
无线数据可以包括例如但不限于终端相关数据和RF环境数据。终端和RF数据被无线交换机104用来支持包括例如但不限于漫游、自动信道选择、伪装AP检测、入侵检测和对策发布的特征。无线交换机104可以与其它的无线交换机(未示出)共享无线数据。 
无线交换机104控制AP 106(以及UAP网108中的AP)。在实施例中，AP 106包括用来为用户和终端接入无线交换机104的功能而提供无线网络连接的无线电发送器和接收器(例如收发器)。在IEEE 802.11环境中，终端是任何IEEE 802.11实体或其它相关标准中的等同物，并且终端可以是漫游的或固定的。应注意，该定义可包括AP。 
在图1的示例中，各AP 106将UAP网108的至少一部分锚定(anchor)至有线网络。AP 106可以当作是无线交换机104(或系统100的其它上行组件)和UAP网108之间的边界装置(borderdevice)。由于可以使用代理地址解析协议(代理ARP)来使得AP106能够代表远程装置(例如，AP用作至无线交换机104的锚的UAP)响应ARP请求，因此能够更有效地利用无线资源。 
在非限定性802.11实现中，各AP 106支持将数据包(packet)作为标准的802.3帧从无线电接口交换至有线接口。AP交换路径可能支持或者不支持802.1q标签数据包，并且可能支持或者不支持MAC或基于用户的ACL(可能要求或者不要求基于端口、VLAN或VPORT的ACL)。可能希望AP同时支持本地交换和重叠模式。然而，即使这样，也不要求数据包应被本地和以重叠模式同时交换。例如，AP上的给定VLAN可能被本地交换或者以重叠模式交换。 
在图1的示例中，UAP网108旨在描述多个可能离散的不具 有至无线交换机104或至AP 106的有线连接的AP。这是为什么无线网中的AP被称为“无缆”的原因。UAP网108中的任何终端，无论是UAP还是某个其它无线终端，都通过AP 106以及零个或多个UAP锚定至无线交换机104，其中所述零个或多个UAP构成从该终端到该AP 106的节点链。在该链中更靠近无线交换机104的AP可称为锚定下行终端。对于任何给定的终端，由于UAP网108不允许在终端和无线交换机104之间存在业务流通回路，因此从该终端至无线交换机104的路径可称为生成树(spanningtree)。 
当UAP网108中的UAP处于联网时，它将试图通过最优的路径到达无线交换机104(注意，尽管期望是最优的路径，但这依赖于实现算法和/或环境因素，在实际中可能达到或者不能达到)。存在多种度量用来测量UAP与AP 106中的一个AP的距离。例如，该度量可以是时间。即，数据包在UAP和锚定该UAP的AP之间传播所使用的时间量。尽管这种度量可以很好地工作，但它通常依赖于如业务堵塞或接收信号强度下降等环境因素而变化。为简单起见，本文所采用的度量是UAP和锚定AP(AAP)之间的跳(hop)数，应理解这仅仅是许多可能度量之中的一个。因此，如果UAP距离AAP一跳，则该UAP可称为一跳UAP。一般来说，距离AAP N跳的UAP可称为N跳UAP。 
优选地，UAP网108的UAP可以包括包含在计算机可读介质中的AP本地交换引擎。AP本地交换引擎可以利用终端交换记录(station switching record，SSR)来判断如何交换给定的消息单位(例如，数据包、帧、数据报等)。这使得能够在UAP网108中有效地交换至少一些业务。此外，优选地，可以将一些业务隧道传回至交换机，而对其它业务进行本地交换。将哪个业务隧道传回以及对哪个业务进行本地交换，是通过利用本文所描述的 教导可以得到的依赖于实现的决策(implementation-specificdecision)。 
SSR可以包括在上行交换机处可用的任何信息。在非限定性的实施例中，在终端相关和认证之后交换机可用的数据包括终端MAC、VLAN号、VLAN名、本地交换标记、标签标记、无线电端口、无线电标签(用于将无线电端口映射至VLAN)、ACL(例如，待映射至终端MAC的入口ACL和出口ACL)和/或代理ARP标记(注意：代理ARP可能仅在能够进行本地交换的情况下才使用)。在对于特定的VLAN能够进行本地交换的说明性实施例中(后面参考图3A至图3D描述其它示例)，如果对于AP能够进行本地交换并且该AP连接至由VLAN名指定的VLAN，则将本地交换标记设置为TRUE(真)。如果通过.1q标签能够到达终端的VLAN，则将标签标记设置为TRUE。当该标记为TRUE时，可以采用VLAN号作为.1q标签值。利用该信息，AP可以创建VLAN并将指定的无线电端口和有线端口添加至具有指定标签值的VLAN。然后，AP发送从其网络端口学习得到的数据包，以潜在地更新任意中间交换机。 
根据在这里所提供的说明应了解，尽管所要求保护的主题的一些方面被描述为与IEEE 802.11标准相关，并且某些实施例具有在802.11环境中实现的特定特征，但是所要求保护的主题自身不限于802.11网络，而通常可以应用于任何适用的无线网络；并且，未来技术的增强可能模糊无线交换机、AP和/或终端之间的区别，在这个意义上，所要求保护的主题被理解成包括提供这些交换机、AP和终端的特征的组件，而与它们如何被封装、组合或者标注无关。 
在说明性实施例中，UAP网108根据生成树而创建。UAP网108中的每个终端试图沿着最优的路径到达无线交换机104。 假设以到达有线的跳数来测量最优的路径，如果第一终端的业务穿过UAP并沿着从UAP到有线的路径通过，则穿过UAP的第二终端的业务将采用相同的从UAP到有线的路径。由于所有的终端都采用该最优的路径，因而这些终端可被表示为树的边缘节点，其中有线处的AP是根节点。因此，AP网相对于每个终端作用为生成树。可注意到该生成树在每个节点处是贪婪的(greedy)，这自然导致有效的(甚至可能最优的)树流。 
因为无线资源相对缺乏，所以减少通过诸如UAP的无线节点到达有线交换机的数据量是至少部分有利的。很少需要保存有线资源。然而，保存有线资源在很多情况下仍然是有用的。因此，本文参考AP所描述的教导可以适用于有线AP，例如AP106(图1)，也可以适用于无线AP，例如UAP网108(图1)的UAP。出于这些原因，在随后的图中，AP可能指有线AP或者无线AP，除非特别标明是被定义为无线的UAP(也即，UAP是“无缆”AP)。 
图2描述了AP本地动态交换系统200的示例。系统200包括无线交换机202、连接至交换机202的AP 204以及无线连接至AP204的两个终端206-1和206-2(统称为无线终端206)。在说明性实施例中，交换机202以SSR的形式向AP 204提供数据，该数据可以包括各种关于无线终端206(或者更为一般的，关于通过AP204连接至交换机202的无线终端)的数据。该SSR可以是包括足以促进在AP 204处进行本地交换或者在无线交换机202处进行交换的数据的任意数据结构。AP 204利用例如但不限于SSID、与消息相关的数据类、与发送消息的终端相关的VLAN、与发送消息的终端的用户相关的认证数据或者某个其它因素，来决定是否进行本地交换。 
在说明性实施例中，无线交换机202知道AP 204将进行本地交换以及该AP连接至哪一个VLAN(如果可用的话)。然而，这 不是绝对的要求。 
在说明性实施例中，AP 204是层2交换机。在说明性实施例中，AP 204通过隧道208连接至无线交换机202。因此，消息可以隧道传输至无线交换机202，以在无线交换机202处进行层2交换。应注意，可能难以支持多个层3协议。所以，通过保持层2的交换，系统200无需具有特定的层3协议(例如，IP)。此外，如果具有带有路由器中的策略的层3骨干，则交换可能使该策略无效。有利地，层2交换至少降低或消除了这些问题。 
由于AP 204是交换设备，因而在说明性实施例中，无线交换机202无需进行用于组播的数据包复制。因此，单个的组播数据包从无线交换机202传输至AP 204，其中如果需要的话，由AP 204复制该数据包。 
在图2的示例中，终端206-2将消息210、212发送至AP 204。AP 204根据AP 204可用的数据来对这些消息进行不同的处理。在图2的示例中，AP 204将消息210通过隧道208发送至交换机202。在图2的示例中，AP 204对消息212进行AP本地交换，并将消息212发送至终端206-1。应注意，消息210可以在交换机202处交换并被发送至终端206-1。作为示例而不是限制，在图3A至图3D中探讨了在AP 204判断是进行本地交换还是在交换机202处进行交换(例如，通过隧道传输)时可以考虑的各种因素的示例。 
图3A描述了按SSID进行AP本地动态交换的系统300A的示例。系统300A包括AP 302和终端304-1至304-3(统称为终端304)。仅出于说明的目的，AP 302包括两个虚拟的AP(VAP)306-1和306-2(统称为VAP 306)。如同相关领域技术人员所知，AP能够广播或者以其它方式处理多个SSID。如果AP广播或者以其它方式处理多于一个的SSID，则该AP在逻辑上可以被当作为多个AP；与各SSID相关的每个逻辑AP可以被称为VAP。在图3A的示例中，如果可能的话，AP 302通过VAP 306-1对业务进行本地交换，并通过VAP 306-2将业务上行传送以进行上行交换。应注意，在非限定性实施例中，即使AP 302处理单个SSID，AP 302也可以按SSID进行AP本地动态交换；即使可能仅有一个结果，判断仍然是动态的。 
图3B描述了按VLAN进行AP本地动态交换的系统300B的示例。系统300B包括AP 312和终端314-1至314-3(统称为终端314)。这些终端被划分为VLAN 316-1和316-2(统称为VLAN316)。仅出于说明的目的，终端314-1和314-2是VLAN 316-1的组成部分，以及终端314-3是VLAN 316-2的组成部分。在图3B的示例中，如果可能的话，AP 312对来自VLAN 316-1的业务进行本地交换，并且将来自VLAN 316-2的业务上行传送以进行上行交换。 
图3C描述了按类进行AP本地动态交换的系统300C的示例。系统300C包括AP 322和终端324-1和324-2(统称为终端324)。仅出于说明目的，终端324-1发送数据业务326和语音业务328至终端324-2。在图3C的示例中，如果可能的话，AP 322对语音业务328进行本地交换，并且将数据业务326上行传送以进行上行交换。有利地，这可以在保持对数据业务的集中控制的同时，使得对于倾向于比数据业务更时间敏感的语音业务能够实现更快的传输时间。 
图3D描述了按用户进行AP本地动态交换的系统300D的示例。系统300D包括AP 332和终端334-1至334-3(统称为终端334)。每个终端334具有各自的相关用户336-1至336-3(统称为用户336)。仅出于说明的目的而描述了用户336和AAA引擎338，以代表基于用户认证的AP本地动态交换(例如，驱动AAA的交 
换)。在图3D的示例中，因为允许用户336-1进行AP本地交换，所以如果可能的话，AP 332对来自终端334-1的业务进行本地交换。然而，因为不允许用户336-3进行AP本地交换，所以AP 332将来自终端334-3的业务上行传送以进行上行交换。有利地，这可以在保持对其它用户的集中控制的同时，使得对于某些用户能够实现更快的传输时间。作为示例而不是限制，允许进行AP本地交换的用户可能是员工，而不允许进行AP本地交换的用户可能是客人。作为另一个示例，在第一公司具有优先(或至少不同)的访问权的情况下，允许进行AP本地交换的用户可能是第一公司的员工，而不允许进行AP本地交换的用户可能是第二公司的员工。 
图3A至图3D的示例旨在仅提供用于实现AP本地动态交换的可能技术的子集。这些技术，无论在图3A至图3D中是否示出，都可以被单独使用，或者与其它技术无论在图3A至图3D中是否示出而结合使用。 
图4描述了能够进行AP本地动态交换的AP 400的示例。AP400包括通过总线412连接在一起的处理器402、可选的以太网(Ethernet)接口404、无线电单元(radio)406、动态交换模块408以及终端交换记录(SSR)数据库410。应注意，在不偏离本文所提供的教导的范围的情况下，可以通过总线412以外的某个部件来连接各个组件。以太网接口404为可选的是因为，例如，AP 400不使用以太网、AP是不具有有线接口的UAP或者出于某个其它原因。无线电单元可以是802.11无线电单元或某个其它无线的无线电单元。 
在说明性实施例中，在诸如非易失性存储装置和/或存储器等的计算机可读介质中实现动态交换模块408。同样在诸如非易失性存储装置和/或存储器等的计算机可读介质中实现SSR数 据库410。在运行中，可以将动态交换模块408的部分从非易失性存储装置加载至存储器，并通过处理器402来执行。在可选实施例中，动态交换模块408可以具有专用的处理器(未示出)。无论处理器是共享的还是专用的，动态交换模块408和处理器都可以统称为动态交换引擎。 
在图4的示例中，在运行中，AP 400从上行交换机接收与下行终端相关的SSR。将该SSR存储在SSR数据库410中。经由直接或间接地通过无线网的插入节点的无线链路，下行终端可以被可操作地连接至AP 400。动态交换引擎利用该SSR来判断是在AP 400处对从下行终端接收到的业务进行AP本地交换，还是将该业务朝着上行交换机进行上行发送。 
图5描述了用于AP本地动态交换的方法的示例的流程图500。在图5的示例中，流程图500开始于可选的模块502，在模块502，接收与无线终端相关的数据。可能在例如AP处接收该数据。模块502为可选的是因为，作为代替(或者除此之外)，如简略所述的，还可以利用与业务相关的数据来判断是否对业务进行AP本地交换。 
在图5的示例中，流程图500进入模块504，在模块504，从无线终端接收层2业务。有利地，由于业务是层2业务，因而系统可以利用任何层3协议(例如，IP)来工作，甚至可以利用多个层3协议来工作。 
在图5的示例中，流程图进入决策点506，在决策点506，判断是否对业务进行本地层2交换。可以利用与无线终端相关的数据(参见例如模块502)或与业务自身相关的数据，来判断是否对业务进行本地交换。例如，无线终端可能被授权进行AP本地交换，这是因为无线终端与特定的VLAN相关。作为第二示例，业务可能具有相对高的优先权，例如语音业务通常具有相对高 的优先权。如果业务具有相对高的优先权，则可能判断为进行本地交换，以使得该业务更快地到达其目的地。应注意，在第二示例中，模块502是可选的。 
在图5的示例中，如果判断为将对业务进行本地层2交换(506-Y)，则流程图500进入模块508，在模块508，对该业务进行本地层2交换，然后进入模块510，在模块510，将该业务朝着其目的地发送。对业务进行交换和发送之后，流程图500结束。 
在图5的示例中，如果判断为将不对业务进行本地层2交换(506-N)，则流程图500进入模块512，在模块512，将该业务层2隧道上行。假定该业务被进一步上行交换。将不进行本地交换的业务层2隧道上行之后，流程图500结束。 
如在本文所使用的，AP可以指标准(有缆)AP或指UAP。在应突出区别的场合，视情况而定，AP可以被称为“(有缆)AP”或“UAP”。如在本文所使用的，术语“实施例”是指用于通过示例但不是限制地进行说明的实施方式。 
尽管已经以具体到结构特征和/或方法行为的语言对保护主题进行了描述，但是应理解，在所附权利要求书中所定义的保护主题不必局限于上述的具体特征或行为。此外，上述的具体的特征和行为作为实现权利要求的示例形式而被公开。 

Claims (16)

1.一种接入点即AP设备，包括：
动态交换模块，其被实现在计算机可读介质中，并被配置为与无线电单元以及用于存储与无线终端相关的终端交换记录即SSR的SSR数据库相连接；
所述动态交换模块被配置为，在将通过所述无线电单元从所述无线终端接收到的业务上行传送之前，基于所述SSR数据库中所存储的与所述业务的特性或所述无线终端的特性相关的数据，来判断是否在AP处对所述业务进行本地交换而不将所述业务上行传送，
如果判断为将不在所述AP处对所述业务进行本地交换，则将所述业务层2隧道上行传送；
如果判断为将在所述AP处对所述业务进行本地交换，则在所述AP处对所述业务进行本地层2交换，并将交换后的业务朝着与所述业务相关的目的地进行发送。
2.根据权利要求1所述的AP设备，其特征在于，在运行中，通过所述无线电单元从上行源接收所述SSR。
3.根据权利要求1所述的AP设备，其特征在于，所述SSR包括从包含终端MAC、SSID、VLAN名、AAA数据和用户数据的组中选出的一个或多个数据。
4.根据权利要求1所述的AP设备，其特征在于，所述动态交换模块被配置为如果判断为在所述AP处对所述业务进行本地交换，则通过所述无线电单元将所述业务发送至下行目的地。
5.根据权利要求1所述的AP设备，其特征在于，所述动态交换模块被配置为如果判断为在所述AP处对所述业务进行本地交换，则通过所述无线电单元将所述业务发送至上行目的地。
6.根据权利要求1所述的AP设备，其特征在于，所述动态交换模块被配置为如果判断为将不在所述AP处对所述业务进行本地交换，则通过所述无线电单元发送所述业务，以在上行交换机处进行交换。
7.根据权利要求1所述的AP设备，其特征在于，所述动态交换模块被配置为与以太网接口相连接。
8.根据权利要求7所述的AP设备，其特征在于，在运行中，通过所述以太网接口从上行源接收所述SSR。
9.根据权利要求7所述的AP设备，其特征在于，所述动态交换模块被配置为判断是否在AP处对所述业务进行本地交换，以根据所述判断通过所述以太网接口来发送所述业务。
10.根据权利要求7所述的AP设备，其特征在于，所述动态交换模块被配置为如果判断为在所述AP处对所述业务进行本地交换，则通过所述以太网接口将所述业务发送至上行目的地。
11.根据权利要求7所述的AP设备，其特征在于，所述动态交换模块被配置为如果判断为将不在所述AP处对所述业务进行本地交换，则通过所述以太网接口发送所述业务，以在上行交换机处进行交换。
12.一种AP本地动态交换系统，包括：
动态交换引擎，其包括在接入点即AP中；以及
所述动态交换引擎被配置为，在将所述AP接收到的业务上行传送之前，基于终端交换记录即SSR数据库中所存储的与所述业务的特性、所述业务的发送方的特性或所述业务的目标的特性相关的数据，来判断是否在所述AP处对所述业务进行本地交换而不将所述业务上行传送，
如果判断为将不在所述AP处对所述业务进行本地交换，则将所述业务层2隧道上行传送以进行上行交换；
如果判断为将在所述AP处对所述业务进行本地交换，则在所述AP处对所述业务进行本地层2交换，并将交换后的业务朝着与所述业务相关的目的地进行发送。
13.根据权利要求12所述的AP本地动态交换系统，其特征在于，如果业务包括语音数据，则所述动态交换引擎被配置为在所述AP处对所述业务进行本地交换。
14.一种AP本地动态交换方法，包括：
在将在接入点即AP处从无线终端接收到的业务上行传送之前，基于终端交换记录即SSR数据库中所存储的与所述业务的特性或所述无线终端的特性相关的数据来判断是否对所述业务进行AP本地交换而不将所述业务上行传送；
如果判断为将不对所述业务进行AP本地交换，则将所述业务层2隧道上行传送；
如果判断为将对所述业务进行AP本地交换，则对所述业务进行AP本地层2交换，并将交换后的业务朝着与所述业务相关的目的地进行发送。
15.根据权利要求14所述的AP本地动态交换方法，其特征在于，还包括：
接收与所述无线终端相关的、表示所述无线终端的特性的数据；
利用与所述无线终端相关的所述数据来判断是否对所述业务进行AP本地交换。
16.根据权利要求14所述的AP本地动态交换方法，其特征在于，将所述交换后的业务朝着下行目的地进行发送。
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US20140364130A1 (en) 2014-12-11
US11627461B2 (en) 2023-04-11
CN101501451A (zh) 2009-08-05
EP2038609B1 (en) 2013-09-11
CA2654827A1 (en) 2007-12-21
WO2007146274A2 (en) 2007-12-21
WO2007146275A2 (en) 2007-12-21
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US10834585B2 (en) 2020-11-10
US20180063766A1 (en) 2018-03-01
US8818322B2 (en) 2014-08-26
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EP2038609A4 (en) 2012-03-14
US20210029544A1 (en) 2021-01-28
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US9232451B2 (en) 2016-01-05
US20070287390A1 (en) 2007-12-13

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