CN1689252A - 无线局域网接入点之间的协作 - Google Patents
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- H—ELECTRICITY
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- H04W48/20—Selecting an access point
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
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- H04W52/08—Closed loop power control
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
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- H—ELECTRICITY
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- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- 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
- H04W88/08—Access point devices
Abstract
一种用于移动通信的方法,包括:在无线局域网(WLAN)中设置多个接入点(22),用于在公用频道上与移动台(24)通信。当在一个或多个所述接入点处接收到由移动台在公用频道上通过WLAN发送的上行链路信号时,在接收到所述上行链路信号的接入点之间进行仲裁,以便选择一个接入点来响应所述上行链路信号。然后,从所选择的一个接入点向移动台发送响应。
Description
发明领域
本发明通常涉及无线通信,尤其涉及改善无线局域网性能的方法和装置。
技术背景
无线局域网(WLAN)正在变得越来越流行,而且新的无线应用正在被开发出来。原始的WLAN标准,例如,“蓝牙(Bluetooth)”和IEEE 802.11,被设计成能够在大约2.4GHz的频带上以1-2Mbps的速率进行通信。最近,为了能实现更高的数据速率,IEEE工作组定义了对原始标准的802.11a,802.11b和802.11g扩展。例如,802.11a标准预见在5GHz的频带中的短距离传输上数据速率可达到54Mbps,而802.11b定义了在2.4GHz的频带中高达22Mbps的速度速率。除非特别声明,在本专利申请的上下文以及权利要求中,术语“802.11”指原始的IEEE 802.11标准及其所有变型和扩展的总体。
新的WLAN技术的理论能力可以为移动用户提供的巨大的通信带宽,但却受到无线通信实际限制的严重制约。由于建筑物格局和家具布置影响无线电波,所以,射频的室内传播不是全向的。因此,即使在整个建筑物内精心地安置无线接入点,通常还会存在一些“黑洞(black hole)”,即无线电接收很少或不能接收无线电的区域。此外,802.11无线链路只有在高信噪比的条件下才能以全速(full speed)运行。信号强度与移动台距接入点的距离成反比,因此,通信速度也是这样。由于距离和无线电传播问题致使接收较差的单个移动台能够减慢对其基本服务集(BSS-与同一接入点通信的移动台组)中所有其他用户的WLAN接入速度。
对这些实际困难的自然反应将是:在服务区域内分布大量的接入点。但是,如果一个接收机在同一频道上同时从两个强度相似的信号源接收信号,该接收机通常不能对任何一个信号进行解码。802.11标准提供了一种用于避免冲突的机制,称为空闲信道评估(CCA),这要求移动台在其频道上检测出其他发射时,则制止其自身的发射。实际上,该机制的实用性是有限的,并会对运行在同一频道上的不同BSS增加沉重的负担。
因此,在现有技术所知的802.11WLAN中,相互邻近的接入点必须使用不同的频道。理论上,802.11b和802.11g标准在2.4GHz频带中定义了14个频道,但是由于带宽和规定的限制,根据这些标准运行的WLAN在美国实际上只有三个不同频道可供选择(在其他国家,例如西班牙、法国和日本,只有一个信道可选)。因此,在复杂的室内环境中,需要分布足够近的无线接入点以使整个环境中有较强信号,同时又保证运行在同一频道上不同接入点的覆盖区域基本不重叠,这在事实上是不可能的。
发明内容
本发明某些方面的目的在于提供用于提高WLAN系统的覆盖范围和速度的方法和装置。
在本发明的优选实施例中,WLAN系统包括分布在服务区域内的多个无线接入点。为了以遍及该服务区域的强通信信号完全覆盖服务区域,优选情况下,使接入点间隔较近,且它们的覆盖区域可能彼此基本重叠。为了解决该重叠问题,接入点在高速、低延迟的通信介质上使用新型协议进行相互通信。优选情况下,该介质包括专用线缆或光纤网络,不过也可使用无线介质实现这一目的。
当移动台发出用于在给定频道中启动通信的上行链路消息时,运行在该频道的多个接入点通常都会收到该消息。为了确定这些接入点中哪一个将与该移动台通信,这些接入点通过在专用介质上进行通信,从而在它们之间进行仲裁。优选地,当WLAN服务区中的移动台每发送一条新的上行链路消息时,就重复该仲裁过程。这样就解决了重叠覆盖区和冲突的问题,尤其有利于那些距所讨论的移动台最近的接入点。因此,可在服务区域内按所需接近程度部署接入点,从而,使得在服务区内任何地方的移动台都可以体验到良好的无线电覆盖范围,而不会感到存在“黑洞”,并能以最佳速度运行。
因此,根据本发明的优选实施例,提供了一种移动通信方法,该方法包括:
在无线局域网(WLAN)中设置多个接入点,以便在公用频道上与移动台通信;
在一个或多个接入点处接收由移动台在公用频道上通过WLAN发射的上行链路信号;
在接收该上行链路信号的接入点之间进行仲裁,以便选择其中一个接入点来响应该上行链路信号;以及
从所选的其中一个接入点向移动台发送响应。
通常,接入点有各自的服务区,而且对多个接入点的设置包括设置接入点使得服务区基本重叠。
在优选的实施例中,对多个接入点的设置包括:将接入点设置成基本根据IEEE标准802.11与移动台进行通信。优选情况下,接入点之间的仲裁包括:选择一个接入点,在IEEE标准802.11规定确认上行链路信号的时限内响应该上行链路信号。
优选地,接入点之间的仲裁包括:在链接(linking)这些接入点的共享通信介质上发送消息,其中,发送消息包括从接收上行链路信号的接入点向所述多个接入点发送广播消息。更为优选的情况是,发送广播消息包括:在共享的通信介质上使用多址接入协议从两个或更多个接入点同时发送消息。最优情况是,该多址接入协议包括码分多址(CDMA)协议。
可选地或者附加地,接入点之间的仲裁包括:多个接入点中的每一个都对该消息进行接收和处理,从而使得每个接入点都确定选择哪个接入点来响应该上行链路信号。通常,对消息的处理包括:选择这些接入点中第一个接收到该上行链路信号的接入点,以便响应该消息。可选地或者附加地,发送消息包括在消息中指示各接入点接收的上行链路信号的强度。
在一个优选的实施例中,对多个接入点的设置包括:链接局域网(LAN)内的接入点,以便与移动台之间往复传递数据,该局域网包括具有多根导线的电缆,发送消息包括在电缆中不用于与移动台之间往复传递数据的一根或多根导线上传递消息。
此外,根据本发明一个优选实施例,还提供了一种移动通信系统,包括:
通信介质;和
多个接入点,这些接入点通过介质相互连接,而且被设置在无线局域网(WLAN)内以便在公用频道上与移动台通信,当在一个或多个接入点处接收到由移动台在公用频道上通过WLAN发送的上行链路信号时,该各个接入点适于通过在介质上发送消息,在接收该上行链路信号的接入点之间进行仲裁,以便选择其中一个接入点去响应该上行链路信号,以及从所选择的一个接入点向移动台发送响应。
根据本发明的一个优选实施例,另外还提供了用于在无线局域网(WLAN)中部署作为用于移动通信的多个接入点中之一的接入点装置,该装置包括:
无线电收发机,被配置成用于在预定频道上与移动台通信;和
消息处理器,当该收发机接收到由移动台在预定频道上经WLAN发射的上行链路信号时,该消息处理器用于与接收该上行链路信号的其他接入点一起执行仲裁协议,以便选择其中一个接入点去响应所述上行链路信号,以及用于控制收发机,以便使收发机遵从仲裁协议将响应返回到移动台。
通过以下结合附图对本发明优选实施例的详细描述,将有助于更好地理解本发明,其中:
附图简述
图1示意性地示出根据本发明优选实施例的WLAN系统的框图;
图2是根据本发明优选实施例的、与多个无线接入点进行通信的移动台的示意图;
图3示意性地示出根据本发明优选实施例的、用于在移动台与无线接入点之间建立通信链路的方法的流程图;
图4示意性地示出根据本发明优选实施例的、在WLAN系统中多个接入点之间的通信链路的框图;
图5示意性地示出根据本发明优选实施例的、在WLAN系统中接入点与集线器之间的通信链路和电源链路的框图;
图6示意性地示出根据本发明优选实施例的、在WLAN系统中接入点之间交换的消息分组的框图。
发明详述
图1示意性地示出了根据本发明优选实施例的无线LAN(WLAN)系统20的框图。系统20包含被配置成用于与移动台24进行数据通信的多个接入点22。移动台通常包括计算设备,例如台式、便携式或手持式设备,如图所示。在下文描述的示例性实施例中,假设接入点和移动台根据IEEE 802.11族标准之一相互进行通信并遵循802.11介质访问控制(MAC)层规范。关于802.11MAC层的细节请详见ANSI/IEEE标准802.11(1999年版)的描述,尤其是第二部分(Part 11:Wireless LAN Medium Access control(MAC)and PhysicalLayer(PHY)Specifications),在此将其引入本发明,作为参考。但是,本发明的原理并不局限于802.11标准,而是同样适用于几乎任何类型的WLAN,包括高性能无线局域网(HiperLAN)、蓝牙和基于hiswan的系统。
接入点22通常通过有线LAN 28与以太网集线器26连接。LAN作为用于在接入点与集线器之间交换数据的分配系统(DS)。该设置使得移动台24能够通过接入点22,经由连接至集线器26的接入线缆32,向外部网络30(如Internet)发送数据和从外部网络30接收数据。LAN 28通常能够以高速(大于接入点与移动台之间无线通信的集总(aggregate)速度)承载数据。不过,主要由于在以太网以及其他传统LAN操作中所固有的冲突避免机制,在LAN上的消息延迟较高,通常在毫秒量级。
除LAN 28提供的传统DS外,还可通过新型共享通信介质34将接入点22与MAC协作集线器36连接在一起。介质34可包括几乎任何适宜的高速通信方式,包括有线、光纤甚或自由空间光或无线电通信(在不与WLAN操作相干扰的允许频带内)。为节约成本,优选介质34包括与LAN 28并行操作的线路。例如,介质34包括已存在于LAN 28的敷设电缆中、但不需承载LAN数据的双绞线缆。MAC协作集线器36的功能仅仅用于连接介质34,以使所有接入点22能够向其他所有接入点广播消息和从其他所有接入点接收消息。因此,与以太网集线器26不同,MAC协作集线器36通常不包括交换机。下面,参照图4和5,描述介质34和集线器36的示例性实现方式。尽管如图1、4和5所示集线器和毂-辐式(hub-and-spokes)拓扑结构通常是配置介质34的最方便方式,但其他配置结构对于本领域技术人员来说也是显而易见的,并落入本发明的保护范围之内。
图2示意性地示出了根据本发明优选实施例,系统20中在移动台24与多个无线接入点22之间同时进行的无线通信。假设标记为AP1、AP2和AP3的接入点都工作于同一频带上,在该频带上移动台24尝试进行通信(假设接入点AP4和AP5工作于不同的频带上,从而不会直接参与该通信过程)。无线电波40、42和44分别从AP1、AP2和AP3以同样幅度到达移动单元24。通过同样的标记,AP1,AP2和AP3在近乎同一时刻接收到移动单元24发送的无线电消息。在现有技术中所公知的WLAN系统中,在这些条件下,移动台24将从两个或更多个接入点22接收下行链路消息,这可能导致移动台不能与任一接入点通信。在本发明的优选实施例中,为解决该冲突,接入点AP1,AP2和AP3通过介质34相互通信,下面还将对此进行描述。
图3是示意性地示出根据本发明优选实施例的、用于在系统20中的移动台24与其中一个接入点22之间建立通信的方法的流程图。在信标发射步骤50中,接入点22(如AP1、AP2和AP3)在其公共频道上发射信标信号。根据802.11标准,由任一给定接入点发送的信标信号都提供时间基准,移动台应使用该时间基准将其通信同步,并且该信标信号指示接入点的BSS标识(BSSID)。可将BSSID视为接入点的MAC地址。在现有技术所公知的802.11WLAN系统中,每个接入点都有其自己惟一的BSSID。但是,在系统20中,接入点AP1、AP2和AP3共享同一BSSID,从而对移动台而言,它们在逻辑上好像是一个单个的、扩展的、分布式的接入点,该接入点在不同位置具有多个天线。利用介质34使AP1、AP2和AP3的时间基准相互同步,并对接入点发送的信标信号进行交织,以避免在它们之间发生冲突。
在信标处理步骤52中,当移动台24接收到足够强的信标信号时,它从信号中提取BSSID和时间基准。该步骤以及移动台所采取的随后步骤完全依照802.11标准。换言之,本发明可按照对现有移动台透明且无需对其进行修改的方式实现。在关联请求步骤54中,移动台24使用其所获取的时间基准和BSSID,按照关联请求消息的方式发送上行链路信号,该关联请求消息被呈送到BSSID并指示移动台的MAC地址。
一般而言,在传统WLAN中,关联请求所呈送到的接入点将立即用一个确认(ACK)做出应答。如果移动台在给定超时期间,通常为10μs内,未接收到ACK,它将提交自动重复请求(ARQ)。最后,如果移动台未接收到所需的ACK,它将会视作该关联请求已经失败。因此,为了在系统20中保持802.11的兼容性,接入点AP1、AP2和AP3中有且仅有一个接入点必须在10μs时限内向移动台24返回ACK。
为确定哪一个接入点将对关联请求消息做出响应,接入点AP1、AP2和AP3利用介质34执行仲裁程序。为此,在广播步骤56中,从移动台24接收到关联请求消息的所有接入点,通过介质34广播消息,以告知其他接入点它们已接收到上行链路消息。每个广播消息指示发送消息的接入点的标识(即,惟一的内部标识,而非BSSID)以及所讨论的移动台MAC地址。优选情况下,为减少广播消息的长度,对移动台的MAC地址进行散列化处理。
接入点通过介质34根据预定协议发送其消息,此协议可区分出由不同接入点同时(或几乎同时)发送的消息。例如,可使用时分多址(TDMA)协议,在该协议中,每个接入点都有其自身的所分配时隙。可选地,也可使用码分多址(CDMA)协议,如后面参照图6所述。另外可选地,也可使用频分复用方案(或者,如果将介质34实现为光纤网络,则使用波分复用,这在本领域是公知技术)。
在处理步骤58中,接入点接收和处理通过介质34发送的广播消息。通过将这些广播消息的接收时间与接入点发送其自身广播消息的时间进行比较,每个接入点都能够确定它是否为第一个发送其消息或另一接入点是否在其之前发送消息(工作在其他频道的接入点以及在同一频道上不能从广播消息中所标识的移动台接收上行链路信号的接入点,可忽略该消息)。通常,能够第一个响应来自给定移动台的上行链路消息而发送其广播消息的接入点,通常距该移动台最近,从而其处在与该移动台继续通信的最佳位置。因此,所有的接入点都独立选择该第一接入点来响应移动台24。或者,也可在选择“胜出”接入点时应用其他准则,如接收信号功率,只要所有接入点统一应用该准则即可。优选情况下,如果出现死锁(如当两个接入点在同一时刻发送其广播消息时),所有接入点应用预定规则统一解决死锁。
在确认步骤60中,胜出的接入点向移动台24发送所需的ACK消息。如上所述,必须在短时间,通常为10μs内发出ACK,且在此时间内,步骤56,58和60必须全部完成。通过将介质34用作该目的的专用共享介质以及通过基于如上所述的短广播消息实现快速仲裁协议,接入点22可满足此时间限制。发送出ACK后,在下行链路步骤62中,胜出的接入点通常向移动台24发送关联响应消息,然后适当地向移动台继续其下行链路发射。
在新上行链路步骤64中,胜出的接入点继续为移动台提供服务,直至移动台发送出另一上行链路消息。然后从步骤56开始,重复以上所述仲裁协议。在下一循环中,特别是如果移动台移到过渡地区,可选择不同的接入点对移动台提供服务。即便移动台发生移动,也无须重复关联协议。如上所述,虽然所有接入点好像是一个单个扩展的接入点,但它们都属于同一BSS。因此,即便接入点之间的仲裁过程选出不同的“胜出者”响应下一个来自移动台的上行链路分组,也因此会保持移动台的同一关联。
图4的框图示意性地示出了根据本发明优选实施例的多个接入点22通过介质34进行通信的细节。该实施例中的介质34包括将每个接入点22连接至集线器36的数对线缆68。集线器36包括分路器70,分路器70按照使介质34作为共享介质的方式(即,从而使任何一个接入点22发送到线缆68上的信号被介质34上的所有其他接入点接收),对线缆68进行连接。在如图4所示的简化实施例中,分路器70包括将所有线缆对耦合在一起的无源电感耦合器。可选择地或附加地,分路器70可包括一个或多个本领域公知的放大器或有源元件。
每个接入点22包括消息处理器72,该消息处理器72用于与其他接入点在介质34上进行通信,以及执行如上所述的MAC级协作协议。消息处理器72通常包括用于通过介质34分别发射和接收广播消息的发射电路74和接收电路76。优选情况下,为满足如上所述的802.11WLAN的定时要求,电路74和76以及介质34工作在至少30MHz的带宽上。根据协作协议,消息处理器72与WLAN收发机78进行交互并对其进行控制。根据可应用的WLAN标准,收发机78与移动台24进行无线通信。
图5的框图示出了根据本发明优选实施例的、在其中一个接入点22与集线器26和36之间通信的更多细节。为简单起见,在该图中仅显示出单个接入点。通常,按照同样方式连接多个接入点,如图4所示。
在本实施例中,使用多路导线电缆86连接LAN 28中的接入点22。通常,电缆86包括以太网LAN中常用的CAT-5类电缆。两路双绞线缆82和84(在CAT-5电缆中的1-2线对和3-6线对)用于经由LAN 28在以太网集线器26与接入点22中的以太网接口80之间发送和接收数据分组。这些数据分组包括经由接入点在移动台24和网络30之间发送的数据。其余双绞线缆对88(4-5线对)通常不用于LAN数据通信。因此,线缆对88用作承载消息处理器72与集线器36之间的MAC协作消息的介质34。对线缆对88的这种新使用无需对介质34单独布线。
在某些LAN(特别是用于连接无线接入点的LAN)中,线缆对88还用于将DC(直流)电传递到接入点22。与以太网集线器26相关联的电源分配集线器90通过线缆对88连接到接入点22中的电源电路92。根据IEEE 802.3af草案标准,集线器90通过线缆对88提供48V的DC电。为了向接入点22的通信电路提供工作电源,电源电路92使该电压逐步降低或对其进行调节。但是,线缆对88上的DC电平不会阻止线对88用作介质34。相反,消息处理器72包括高频耦合器94,通常为电感耦合器,它将在介质34上的高速通信业务从DC电中分离出来。
图6的框图示意性地示出了根据本发明优选实施例的、其中一个接入点22通过介质34发送的广播分组100。当接入点接收到来自其中一个移动台24的上行链路通信时,它们使用分组100传递广播通知消息,如以上参照图3(步骤56)所述。本实施例假设接入点使用CDMA协议在介质34上通信。与TDMA相比,CDMA的优势在于,它允许所有接入点同时进行广播,且不需要主时钟、延迟补偿或智能中央单元。
分组100包括前导码102,前导码102通常由同步字104和接入点标识符106组成。如上所述,标识符106为私有的内部标识码,它惟一标识发送该分组的接入点。优选情况下,每个接入点22中的消息处理器72具有一组数据掩码,这些数据掩码分别与配置用于在同一WLAN频道上进行发送和接收的所有其他接入点的前导码102相对应。当消息处理器在介质34上接收数据时,它将数据与其每个掩码进行比较,以检测新分组的开始以及发送该分组的接入点的标识。为此,使用CDMA领域中公知的沃尔什(Walsh)码将是十分有利的。
前导码102后面跟有广播消息108,广播消息108用于识别发送分组100所描述的上行链路消息的移动台。消息处理器72使用它的其中一个数据掩码对前导码成功解码后,使用同样的数据掩码对消息108解码。从而,消息处理器识别发送上行链路消息的移动台和第一个将其接收的接入点,以此方式,就能够断定哪一个接入点应对该上行链路消息做出响应,如上所述。任选地,消息108可包括其他参数,如接收的上行链路消息的功率电平和/或接入点接收到该消息的天线的标识(出于分集考虑,接入点通常具有多个天线)。在接入点之间的仲裁中,除分组100的接收时间外,还可使用这些附加参数,或用这些附加参数代替分组100的接收时间。
如上所述,尽管,在此参照具体类型的无线和有线LAN以及具体的通信标准,对优选实施例进行了描述,但本发明的原理同样可应用于根据其他标准工作的其他类型的LAN和WLAN。此外,这些原理也可应用于IEEE标准802.15定义的无线个人区域网(PAN),包括超宽带(UWB)PAN。本领域技术人员应当理解,上述优选实施例只是以示例的方式加以引用,本发明并不局限于以上具体显示和描述的实施例。相反,本发明的保护范围包括上面描述的各种特征的组合和次组合(subcombinations)以及背景技术中没有披露的、但对于阅读过前面描述的本领域技术人员来说属于显而易见的变型和修改。
Claims (33)
1、一种用于移动通信的方法,包括:
在无线局域网(WLAN)中设置多个接入点,以在公用频道上与移动台进行通信;
在一个或多个所述接入点处接收由所述移动台在公用频道上通过WLAN发射的上行链路信号;
在接收所述上行链路信号的各个接入点之间进行仲裁,以便选择其中一个接入点来响应所述上行链路信号;以及
从所选择的其中一个接入点向所述移动台发送响应。
2、根据权利要求1所述的方法,其中,所述接入点有各自的服务区,且对所述多个接入点的设置包括设置所述接入点从而使各服务区基本重叠。
3、根据权利要求1所述的方法,其中,对所述多个接入点的设置包括将所述接入点设置成实际上根据IEEE标准802.11与所述移动台进行通信。
4、根据权利要求3所述的方法,其中,所述接入点之间的仲裁包括选择其中一个接入点,以在IEEE标准802.11规定的确认上行信号的时限内响应所述上行链路信号。
5、根据前述权利要求中任一权利要求所述的方法,其中,所述接入点之间的仲裁包括,在链接所述接入点的共享通信介质上发送消息。
6、根据权利要求5所述的方法,其中,发送消息包括从接收所述上行链路信号的所述接入点向所述多个接入点发送广播消息。
7、根据权利要求6所述的方法,其中,发送广播消息包括,在所述共享的通信介质上使用多址接入协议从两个或更多个接入点同时发送消息。
8、根据权利要求7所述的方法,其中,所述多址接入协议包括码分多址(CDMA)协议。
9、根据权利要求5所述的方法,其中,所述接入点之间的仲裁包括,在所述多个接入点中的每一个接入点对消息进行接收和处理,从而使每个接入点都确定将选择哪个接入点来响应所述上行链路信号。
10、根据权利要求9所述的方法,其中,对消息的处理包括,选择第一个接收到所述上行链路信号的接入点,以响应所述消息。
11、根据权利要求5所述的方法,其中,所述消息的发送包括在所述消息中指示每个所述接入点接收的上行链路信号的强度。
12、根据权利要求5所述的方法,其中,对所述多个接入点的设置包括,链接局域网(LAN)内的接入点,以便与所述移动台之间往复传输数据,所述局域网包括具有多路导线的电缆,而且;发送消息包括在不用于与所述移动台往复传递数据的电缆中的一根或多根导线上传递消息。
13、一种用于移动通信的系统,包括:
通信介质;和
多个接入点,所述接入点通过所述介质相互连接,而且被设置在一个无线局域网(WLAN)内以便在公用频道上与移动台通信,当在一个或多个所述接入点处接收到由所述移动台在公用频道上通过WLAN发送的上行链路信号时,所述接入点用于通过在介质上发送消息从而在接收所述上行链路信号的各接入点之间进行仲裁,以便选择其中一个接入点去响应该上行链路信号,并且从所选择的其中一个接入点向所述移动台发送响应。
14、根据权利要求13所述的系统,其中,所述接入点有各自的服务区,且被设置为使至少一些服务区基本重叠。
15、根据权利要求13所述的系统,其中,所述接入点用于实际上根据IEEE标准802.11与所述移动台进行通信。
16、根据权利要求15所述的系统,其中,所述接入点用于选择其中一个接入点,从而在IEEE标准802.11规定的确认上行链路信号的时限内响应所述上行链路信号。
17、根据权利要求13-16中任一权利要求所述的系统,其中,所述介质被配置为共享通信介质。
18、根据权利要求17所述的系统,其中,接收所述上行链路信号的接入点用于通过介质向所述多个接入点广播消息。
19、根据权利要求18所述的系统,其中,所述接入点用于使两个或更多个接入点利用多址接入协议几乎同时广播消息。
20、根据权利要求19所述的系统,其中,所述多址接入协议包括码分多址(CDMA)协议。
21、根据权利要求17所述的系统,其中,所述多个接入点中的每一个用于接收和处理消息,从而确定选择哪个接入点来响应所述上行链路信号。
22、根据权利要求21所述的系统,其中,所述接入点用于选择其中第一个接收到所述上行链路信号的接入点来响应所述上行链路信号,从而响应所述消息。
23、根据权利要求17所述的系统,其中,所述接入点用于在所述消息中指示每个所述接入点接收的所述上行链路信号的强度。
24、根据权利要求13-16中任一权利要求所述的系统,包括一个局域网(LAN),该局域网包括具有链接所述接入点的多根导线的电缆,其中,所述接入点用于通过LAN将数据传递到所述移动台和从所述移动台传输数据,所述通信介质包括在该电缆上不用于与所述移动台往复传递数据的一根或多根导线。
25、一种接入点装置,用于部署在一个无线局域网(WLAN)中作为用于移动通信的多个接入点中的一个接入点,所述装置包括:
无线电收发机,被配置成用于在预定频道上与移动台通信;和
消息处理器,当所述收发机接收到由该移动台在预定频道上经WLAN发射的上行链路信号时,所述消息处理器用于与接收所述上行链路信号的其他接入点一起执行仲裁协议,以便选择其中一个接入点去响应所述上行链路信号;控制所述收发机,以便使所述收发机遵从仲裁协议将响应返回到该移动台。
26、根据权利要求25所述的装置,其中,所述收发机用于实际上根据IEEE标准802.11与所述移动台进行通信。
27、根据权利要求26所述的装置,其中,所述消息处理器用于执行所述仲裁协议,以选出其中一个接入点在IEEE标准802.11规定的确认上行链路信号的时限内响应所述上行链路信号。
28、根据权利要求25-27中任一权利要求所述的装置,其中,所述消息处理器用于在连接所述接入点的共享通信介质上通过与其他接入点之间往复发送和接收消息从而执行所述仲裁协议。
29、根据权利要求28所述的装置,其中,所述消息包括广播消息;且所述消息处理器用于当所述收发机接收到所述上行链路信号时发送其中一个广播消息。
30、根据权利要求29所述的装置,其中,所述消息处理器用于通过共享通信介质使用多址接入协议发送消息。
31、根据权利要求30所述的装置,其中,所述多址接入协议包括码分多址(CDMA)协议。
32、根据权利要求28所述的装置,其中,所述消息处理器用于对从其他接入点接收的消息进行处理,以便确定第一个接收到所述上行链路信号的其中一个接入点,并选择第一个接收所述上行链路信号的其中一个接入点来响应所述上行链路信号。
33、根据权利要求28所述的装置,其中,所述消息处理器用于在其发送的消息中包括所述收发机接收的上行链路信号的强度。
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CN109862604A (zh) * | 2019-04-16 | 2019-06-07 | 武汉思创易控科技有限公司 | 一种基于ap的就近接入方法、控制方法、存储介质和ap |
CN109862604B (zh) * | 2019-04-16 | 2021-03-23 | 武汉思创易控科技有限公司 | 一种基于ap的就近接入方法、控制方法、存储介质和ap |
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US20030206532A1 (en) | 2003-11-06 |
US20040063455A1 (en) | 2004-04-01 |
KR100980308B1 (ko) | 2010-09-06 |
CN1689246A (zh) | 2005-10-26 |
EP1529355A4 (en) | 2008-01-16 |
WO2004015888A1 (en) | 2004-02-19 |
JP2005535254A (ja) | 2005-11-17 |
JP4347809B2 (ja) | 2009-10-21 |
KR20050055706A (ko) | 2005-06-13 |
AU2003282887A1 (en) | 2004-02-25 |
US7797016B2 (en) | 2010-09-14 |
EP1529355A1 (en) | 2005-05-11 |
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