CN100356801C - 无线移动单元通信中以位置为基础的方法及系统 - Google Patents

无线移动单元通信中以位置为基础的方法及系统 Download PDF

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CN100356801C
CN100356801C CNB038235404A CN03823540A CN100356801C CN 100356801 C CN100356801 C CN 100356801C CN B038235404 A CNB038235404 A CN B038235404A CN 03823540 A CN03823540 A CN 03823540A CN 100356801 C CN100356801 C CN 100356801C
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高腾·G·雷迪
伯拉哈卡·R·季塔布
利昂德·卡萨凯费许
卡泰瑞莎·亨克勒
雅提·坎德拉
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
    • 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
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/029—Location-based management or tracking services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • 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
    • H04W88/02—Terminal devices
    • 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
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/0009—Transmission of position information to remote stations
    • G01S5/0018—Transmission from mobile station to base station
    • G01S5/0027—Transmission from mobile station to base station of actual mobile position, i.e. position determined on mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies

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Abstract

本发明提供一种具有较佳通信使用的地理区域的无线网络中的无线移动单元通信用的方法及系统。一移动单元的一评估的地理位置被确定。该移动单元关于该被确定移动单元评估位置的至少一较佳通信区域的相关位置数据被提供。该移动单元随后基于该相关位置数据重新被定位至一较佳通信区域。较佳者，一预设较佳区域用的要求由一移动单元传输激活并由一网络基地台接收。该移动单元可配备有全球定位系统(GPS)以确定该移动单元的评估位置。评估位置数据的传输可以依据移动单元或网络是否计算相关位置数据而定。

Description

无线移动单元通信中以位置为基础的方法及系统
技术领域
本发明有关无线移动单元通信用的以位置为基础的方法及系统；尤其是有关具有设定为较佳通信使用的地理区域的系统，有时称为热点(hot spots)。
背景技术
无线通信系统于本领域中是为人所熟知。通常，此种系统包括通信站，其互相传输并接收无线通信信号。通常，提供能够进行与复数用户站，通常称为无线传输/接收单元(WTRUs)，其包括移动单元，的同时无线通信的基站。通常，此处所使用的基站包括但不限于，基站，点B，位置控制器，存取点或其它提供无线存取至与之相关的网络的无线环境中的接口装置。此处所使用的WTRU一词包括但不限于使用者设备，移动站，固定或移动用户单元，呼叫器，或其它型态的能够在无线环境中操作的装置。
WTRU包括个人通信装置，例如电话，视讯电话以及具有网络连接的网际网络电话。此外，WTRUs包括可携式个人计算机装置，例如具有类似网络能力的无线调制解调器的PDAs以及笔记本计算机。
可携带或可改变位置的WTRUs被称为移动单元。对于移动单元而言，电池寿命的维护通常是设计移动单元及于其中运作的通信网路时的重要考量。有许多方式达成降低移动单元中的功率消耗的目标。例如，在一地理区域中连接基站的数目的增加可被解释为移动单元通信所需的降低的功率。
图1a表示无线局域网络(WLAN)106中的一移动单元104，其中一基站102位于WLAN 106的中央。当移动单元104从基站102离开时，WTRU 104及基站102必须增加功率以确保在它们无线通信中的相同服务品质(QoS)。
图1b表示一WLAN 112，一移动单元107以及9个通信站101，103，105，109，111，113，115及117。此基站的稠密的集中降低从移动单元107至每一基站的距离。这允许移动站及基站使用较少的传输功率，因为较短的距离。此种基站的稠密集中因为传输距离而降低功率需求，但有增加的干扰成本。干扰的增加可能需要移动单元及基站增加传输功率，借此取消功率消耗并伴随电池寿命的保存。
系统可借由确定每一移动站的位置并聚集基站的天线波束图案在每一移动站的方向而降低干扰。聚集天线波束图案已知为束型(beam forming)。
图2a至图2c说明使用例如由本发明受让人拥有的美国第10/305,595号申请案的束型系统的天线幅射图案。图2a说明基于移动单元的相对位置，具有聚集射频能量至一移动站UE1以及来自该移动站的天线图案12的基站10。
束型可选择地被使用于具有基于，例如位置及相对干扰的因子，而受控制的多重波束或一单一波束多重无线同时通信的服务。图2b及图2c说明基于不同移动单元的相对位置，聚集射频能量至移动单元UE2及UE3及来自该移动单元的基站10的二不同方案。
为使用束形，首先必须确定移动单元的位置。位置确定可借由任何一种已知的方法达成。例如，此移动单元可以使用内建的全球定位系统(GPS)接收器并报告其位置至网络而确定其位置。网络也可以使用抵达角度(Angle of Arrival，AOA)，抵达时差(Time Difference of Arrival，TDOA)，或都卜勒技术(Dopplertechnology)确定移动单元的位置。也可使用以网络协助移动单元确定其本身位置的混合方法。通常，每一种方法产生具有评估误差的相关边际(margin)的相对移动单元位置的一评估。
服务提供者有许多方式可以提供并控制网络存取。例如，具有一或更多WLAN存取点的一通用的无线局域网络协议可建立在IEEE 802.11b标准。在此种网络中，被选择的WLAN服务可以在相当小，定义良好的地理区域，已知为「热点」，中被提供。这些区域允许使用者有能力与他们的移动单元在线(on-line)并存取无线网络。
「热点」WLAN通信系统可有利地被配置在许多位置，例如机场，咖啡厅以及图书馆。对这些网络的存取通常经由使用者授权程序而达成。因为通常包含IEEE802家族标准，此种程序在WLAN技术领域中尚未完全标准化。
申请人意识到一个与热点通信的问题，其中使用者在定位热点区域的位置时可能有困难，尤其是使用者必须实质上被定位以获得WLAN中的最佳QoS。
发明内容
本发明提供一种具有为较佳通信使用而设计或确定的地理区域的无线网络中的无线移动单元用的方法及系统。在许多应用中，特定的区域被预先定义为「热点」。或者是，较佳的通信区域可相对于信号品质或其它与移动单元的进行中通信的通信参数而被确定。
此方法包括确定一移动单元的评估的地理位置。此移动单元被提供至少一个相对于该确定的移动单元评估位置的较佳通信区域的相对位置数据。此移动单元随后基于相对的位置区域重新被定位至此种较佳通信区域。
较佳者，一热点区域用的要求由一移动单元传输以及由一网络基站接收而开始，其中该移动单元被配置一全球定位系统(GPS)，该移动单元的评估位置是由使用该移动单元的全球定位系统(GPS)而被确定。此移动单元要求传输随后可包括现行移动单元评估的位置数据，且网络基站传输由网络基于现行移动单元评估位置数据而确定的相对位置数据至移动单元。较佳者，由网络基站传输至移动单元的相对位置数据是由网络基于现行移动单元评估位置数据及热点区域使用量的动态数据，例如现行进行中的无线通信数目，而确定。
另一种方式是现行移动单元评估位置是由无线网络确定。位置评估是使用和一或更多网络基站接收的移动单元传输的物理特性相关的习知数据分析而导出。其中一网络基站随后传输全部由网络确定的相对位置数据给移动单元。由网络传输至移动单元的此相对的位置数据可以由网络基于现行移动单元评估位置数据以及网络使用量的动态数据而确定。因此，该相对位置数据可以对应一预先设计的热点区域或简单地对应网络确定将提供该移动单元一改善的无线连结的区域。
在移动单元被配置一全球定位系统时，移动单元不需要传输评估的数据至网络。网络基站可以传出由基站服务的所有预先设定的热点区域的移动单元地理位置数据给移动单元。此移动单元对热点的相对位置数据随后可由移动单元经由其GPS确定。
此网络可以允许和网络基站的直接移动单元无线通信以及移动单元之间的对等(peer-to-peer)无线通信。由移动单元激活的由网络基站接收的要求可经由位于由该基站服务的一热点区域中的一不同的移动单元传递。
此网络可被设计为用以监视移动单元被评估位置以及周期性地传输较佳通信区域的相对位置数据至移动单元。较佳者，此种数据是由网络基于现行移动单元被评估位置数据以及移动单元信号的动态数据及/或网络使用量而被确定。此网络可以确定较佳通信区域的阶层优先次序以及传输相对位置数据一最佳喜好通信区域优先次序或一串阶层式的优先次序至移动单元。
此地理热点区域较佳者由储存于网络数据库中的个别的地理坐标集合定义。一或更多数据集合从一网络基站有选择性地被传输以提供相对位置数据给移动单元。
此种在无线网络通信中使用的移动单元较佳者具有一传输器，接收器以及使用者输出装置。此传输器用以激活较佳通信区域位置用的要求。接收器是用以接收对应由网络服务的至少一较佳通信区域的地理位置数据。使用者输出装置改变由网络服务的至少一较佳区域的相对位置的移动单元使用者至移动单元的评估的位置，其由网络或移动单元依据移动单元如何被配置而确定。
此移动单元可以被设计成为，包括但不限于无线局域网络(WLAN)，分时双工(TDD)电信通信系统及/或分频双工(FDD)电信通信系统上的无线通信或无线网络。因此，此移动单元的传输器及接收器被设计为使用将被使用的特定系统的协议。
此移动单元可以配置一全球定位系统(GPS)用以确定移动单元的一评估位置。在此种情况中，此传输器可用以借由传输包括现行移动单元评估位置数据的一信号而传输一较佳通信位置，而移动单元接收器是用以接收对应至少一较佳通信区域的以网络基于传输的移动单元评估位置数据而确定的相对位置数据的形式的地理位置数据。
或者是，此移动单元位置不借由配置GPS的移动单元传输至网络。此移动单元的GPS是用以基于响应一传输的要求所接收的地理位置数据计算对应较佳通信区域的相对位置数据，其对应由该网络服务的至少一较佳通信区域。
在没有移动单元GPS时，移动单元接收器较好用以接收对应至少一较佳通信区域的地理位置数据，以基于无线网络而确定的一移动单元评估位置的相对位置数据的形式。
此移动单元可被设计为用以直接与网络基站通信以及和其它移动单元的对等无线通信。在此种情况中，此移动单元较佳者也用以在与一网络基站直接通信中接收经由一中继器来自另一移动单元的对应一传输的要求的响应。
此移动单元可具有一地图显示器以在视觉上显示相对于被评估移动单元位置的较佳通信区域。此使用者装置可包括一功率使用指示器，其于移动单元实体位于功率消耗相当高的区域中时驱动。此一指示器可被用以手动或自动触发功率消耗较低的较佳通信区域一要求。
从以下结合附图的详细描述本技术的人士可了解本发明其它的目的及优点。
附图说明
图1a说明无线局域网络(WLAN)中的移动单元。
图1b说明具有多重基站的WLAN。
图2a-2c是束型系统中的天线幅射图案的例示图。
图3是二移动单元，一基站以及多种障碍的方块图，于其中有利地使用本发明。
具体实施方式
本发明参照附图而被描述，其中相同的标号代表相同的组件。基站，WTRU，以及移动单元等名词如以上所述以其一般的方式被使用。本发明提供一种具有一或更多网络基站的无线射频存取网络，经由该基站可以提供移动单元，亦即移动WTRUs，用的无线服务，当它们进入及/或经过个别基站提供的地理覆盖区域的个别区域时。为简化起见，本发明被描述为使用在建立于IEEE802.11标准的具有基站，即存取点，的无线局域网络(WLAN)。较佳者，此WLAN具有预先为称为热点的较佳通信使用的地理区域。此种网络可被设计为移动单元存取的直接网络以及允许对等移动单元通信，有时称为多跳网络(ad hoc)通信。但是，所提出的发明可应用于可由移动单元存取的任何无线系统。例如，取代热点区域，较佳的通信区域可以相对于信号品质或与一移动单元通信中的其它通信参数而被确定。
参照图3，一无线通信环境400被表示为具有移动单元402，404以及具有至少一基站406的WLAN 405。此移动单元较佳者配置有一全球定位系统(GPS)以使它们能够确定它们自己的地理位置。
此基站经由相关的天线系统407提供在被选择地理区域中的网络存取。不同的障碍物，例如墙408，房屋409及/或办公室建筑411可能限制基站提供服物品质QoS。虽然障碍区域可以由基站406服务，相较于无障碍区域，例如区域401及403，功率需求在障碍区域中通常较大。无障碍的区域可有利地被设计为支持通信及或加强对位于此种区域的移动单元通信服务的较佳的区域。
如果移动单元402不包括GPS或未被设计为可确定其本身位置，WLAN 405确定移动单元的评估的位置，例如使用多种前述的三角技术或都卜勒技术。例如，此WLAN 405确定移动单元402的相对位置至基站406的天线并传输位置信息数据至移动单元402以协助移动移动单元402至热点区域401及403。
热点服务可借由使用选择性服务用的束型而被提供。例如，由基站天线接收及传输的波束可被设计为覆盖热点区域，因此通信功率临界不与由试图使用热点区域外部的被选择服务的一移动单元相配，即使在基站天线的通信半径的内。或者是，结合束型，此基站可以用以仅提供一移动单元用的加强的通信，当其经由相对地理数据的评估确定此种移动单元实体上位于热点区域中时。例如，基本呼叫服务可以为从基站406的天线407的360度半径而被提供，而数据移转，语音及/或网际网络服务仅可在热点区域401及403中提供。在此例中，移动单元402可在其所示的位置被呼叫，但是需要重新定位置热点区域401或403以进行由热点无线通信系统支持的其它型态的通信。
或者是，基站可以被设计为提供一预定通信半径内的服务，但改变一移动单元，当其实体上不位于功率消耗相当高的热点区域。例如，所有的服务可播提供于从基站406的天线407的360度半径，但更多量效率的服务可能在热点区域401及403中提供。在此种例中，移动单元402可以接收通知，当其说明其位置时，但将不会接收此种通知如果它重新位于热点区域401或403的话。
网络405较佳者维持与每一基站406服务的热点相关的数据，包括可以是基于最近通信历史的位置相对于输入输出处理量的动态表格的形式的相对地理覆盖区域数据。此数据随后可以和移动单元地理数据一起使用以提供重新定位数据给移动单元而致能使用者重新定位至使用加强的服务用的热点区域。
WLAN 405较佳者是用以接收并响应热点位置要求。例如，基站406是用以提供至少一些通信服务外部热点区域401，403时，移动单元402传输一要求以存取仅存在于一热点位置的中的服务。在此要求包括移动单元地理数据，或网络可以确定要求的移动单元的位置时，网络405随后以最接近该使用者位置的一个或更多热点位置的数据集合做为回复。此使用者随后可以移动至这些区域中的一个以存取及/或达到较佳的服务品质(QoS)。
网络405可以基于提供给移动单元的信息以那些热点是位于提出要求的移动单元的临界距离中的热点的确定为基础。此选择的标准可动态地以对直接移动单元至较少使用的热点的网络使用量为基础，借由不提供在要求时刻进行大量通信流量的热点位置数据或借由以存在的QoS为基础表列该等位置。例如，参照图3，首先仅由热点区域403跟随的热点区域401被移动单元402识别，其中移动单元404正在热点区域403中进行通信且热点区域401中没有并行的通信进行。
做为对于特定移动单元要求的另一种选择，WLAN 405可以监视移动单元位置以及主动地，不需要使用者激活介入，通知使用者移动一不同的位置以达到更有效率的输入输出处理量。这可被用以维持一进行中的通信而通知使用者一加强的服务区域或一更有能量效率的位置已经存在。例如，WLAN 405监视的移动单元402随后被用以提供移动单元402实时的更新射频覆盖信息，当移动单元402通过基站406的WLAN覆盖区域时。
此移动单元可被配置具有可显示地图功能，例如已知的GPS系统，的显示器。在此种情况中，在WLAN 405，例如，确定移动单元402的位置之后，系统405下载包含被显示为移动单元402上的地图影像用的热点坐标地图信息。
例如，此被下载的信息可包含和热点位置401，403相关的坐标信息，以整个地图的形式或，如果移动单具有一般地图信息做为定义内建于地图的移动单元上的资区域的坐标。
此等热点，例如位置401及403可以在来自网络的一较早的下载中被提供，公告于一网络指引中，或从之前经过WLAN 405的基站406服务的无线覆盖区域的逗留归纳式地确定。此种外部或之前储存的信息被指示至特定的WLAN405，该WLAN 405可传递识别信息至移动单元402通知它其以经位于该WLAN的服务区域内且该移动单元随后可确定至入点位置的一路径及/或方向而不需要额外信息。
当WLAM被用以仅提供服务给物理上位于热点区域中的移动单元时，此种外部或的储存的移动单元可使用的资源可被该移动单元使用以定位服务区域。例如，无线无务可以仅在热点区域401及403中提供。在此种例中，移动单元402将需要重新定位至热点401及403以进行由该热点无线通信系统405所支持的其它型态的通信。
为重新定位，移动单元可以使用外部或的前储存的信息，如果有的话。或者是，当WLAN是用于经由热点的网络存取及移动单元之间的多跳网络对等通信时，热点区域要求可以不直接对WLAN。例如，移动单元402可以传递热点位置信息要求至位于热点区域403中的移动单元404，其接着传递此要求至WLAN 405，其接着经由移动单元404传输重新定位信息至移动单元402。
较佳者，热点服务区域信息储存于WLAN 405的一数据库中，并经常性地被更新。动态QoS信息可被用以基于流量及其它参数，尤其是关于射频干扰的因子，维持热点的等级。服务区域信息可使用网络天线407幅射图案被导出及/或使用历史移动单元品质服务回馈信息随时间对应。
虽然可以使用束型，且在某些情况中被用以定义热点区域，不像典型的基于移动单元位置传导波束的束型系统，本发明的无线通信系统通常要求移动单元重新将它们自己定位置束型波束被传导的其中的热点区域。当束型被用以服务一定义的热点区域时，此波束可被调整以计入热点区域中真实的流量。例如，来自基站406经由天线407形成的波束可能不会在任何特定的时间点确实覆盖热点区域401及403的整个区域，而是被调整以便在提供热点区域中的服务时提供更为最佳的输入输出处理量。对于图3所示的极受限的情况，有可能一波束可被传导至仅覆盖该热点区域403的一部份以服务移动单元404且不需要未被占用的热点区域401的任何覆盖。但是，在此种情况中，WLAN在它们的整体中较好是具有某些热点区域监视的型态，因此当一移动单元进入时可以提供适合的波束，或在一热点区域中被驱动。
虽然前述讨论的WLAN技术使用802.11技术，本发明可被实施于任何无线通信系统，例如分时双工(TDD)或分频双工(FDD)无线电话系统。

Claims (13)

1.一种具有较佳通信使用的地理区域的无线网络中的无线移动单元通信方法，其中，该移动单元在该地理区域中能与一网络基站进行较佳通信，该方法包括以下步骤：
确定一移动单元的一评估的地理位置；以及
提供与该被确定的移动单元评估位置相关但不包括该被确定的移动单元评估位置的至少一较佳通信区域的相关位置数据予该移动单元。
2.如权利要求1所述的方法，其特征在于还包括步骤：
借由该移动单元传输激活一预先设定的较佳通信区域位置用的一要求；以及
由一网络基站接收该要求。
3.如权利要求2所述的方法，其特征在于该移动单元配备有一全球定位系统(GPS)，该移动单元评估位置是借由使用该移动单元的全球定位系统而被确定，该移动单元要求传输包括现行移动单元评估位置数据，而该网络基站传输由该网络基于该现行移动单元评估位置数据而确定的相关位置数据至该移动单元。
4.如权利要求3所述的方法，其特征在于由该网络基站传输至该移动单元的该相关位置数据是基于该现行移动单元评估位置数据以及较佳通信使用的动态数据而由该网络确定。
5.如权利要求2所述的方法，其特征在于一现行移动单元评估位置是由与该移动单元要求传输的物理特性相关的该无线网络分析数据而被确定，且该网络基站传输由该网络基于该现行移动单元评估位置数据而确定的相关位置数据至该移动单元。
6.如权利要求5所述的方法，其特征在于由该网络基站传输的该相关位置数据是基于该现行移动单元评估位置数据以及较佳通信使用的动态数据而由该网络确定。
7.如权利要求2所述的方法，其特征在于该移动单元配备有一全球定位系统，该移动单元评估位置是借由使用该移动单元的全球定位系统而被确定，该网络基站传输由该基站服务的全部网络预定的较佳通信区域的地理位置数据至该移动单元。
8.如权利要求2所述的方法，其特征在于该网络允许与该网络基站的直接移动单元无线通信以亦允许移动单元之间的对等(peer-to-peer)无线通信，其中由该移动单元激活且由该网络基站接收的该要求是经由位于由该基站服务的一预设较佳通信区域中的一不同移动单元传递。
9.如权利要求1所述的方法，其特征在于该网络监视被确定的移动单元评估位置且该相关位置数据是周期性地被传输至由该网络基于该现行移动单元评估位置数据以及网络使用的动态数据确定的该移动单元。
10.如权利要求1所述的方法，其特征在于该移动单元配备有一全球定位系统且该移动单元评估位置是借由使用该移动单元的全球定位系统而被确定。
11.如权利要求1所述的方法，其特征在于该相关位置数据是由该网络基于该被确定的移动单元评估位置数据以及该网络使用数据的动态数据而被确定，因此较佳通信区域的一阶层式的优先次序被确定，且相关位置数据至少一第一较佳通信区域优先次序由一网络基站传输至该移动单元。
12.如权利要求1所述的方法，其特征在于还包括以下步骤：
借由个别地理坐标集合定义较佳通信区域；
储存该坐标集合于一网络数据库；以及
选择性地从一网络基站传输一或更多该数据集合以提供该移动单元相关的位置数据。
13.如权利要求1所述的方法，其特征在于该移动单元配备有一地图，该方法还包括使用相关位置数据以显示与该评估的移动单元位置相关的热点区域，并基于该相关位置数据重新定位该移动单元至一较佳通信区域的步骤。
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