TWI332782B - Method for performing wireless switching - Google Patents

Method for performing wireless switching Download PDF

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Publication number
TWI332782B
TWI332782B TW95124221A TW95124221A TWI332782B TW I332782 B TWI332782 B TW I332782B TW 95124221 A TW95124221 A TW 95124221A TW 95124221 A TW95124221 A TW 95124221A TW I332782 B TWI332782 B TW I332782B
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frequency
carrier
users
sap
terminal
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TW95124221A
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TW200721866A (en
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Carlos Zuniga Juan
Joanne Hunkeler Teresa
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Interdigital Tech Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • 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
    • 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
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • 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]
    • 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
    • H04W88/08—Access point devices

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)
  • Transmitters (AREA)
  • Liquid Developers In Electrophotography (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Radio Transmission System (AREA)

Description

1332782 九、發明說明： 【發明所屬之技術領域】 本發明關於與數用戶連接之無線LAN系統(WLAN)。特 別關於供避免衝突之WLAN系統之切換。 【先前技術】 WLAN系統利用無執照波段供無線通信。一無線 LAN(WLAN)通信系統可自一特定終端至一所欲目的地、相 同基本服務系統(BSS)内或基幹網路之另一終端，但始終在同 一載波内。WLAN系統有二作業模式:專案及基礎結構。於專 案模式中，終端能以多點對多點方式彼此通話。而於基本結 構模式柃，一存取點(AP)係作為—基站以控制用戶間之傳 輪’因而可提供-點對多點無線網路。因為所有用戶均分享 WLAN中之一相同媒體，基本結構模式對於半繁忙至繁忙負 載網路而言也變得更有效率。 在基本結構模式中，當發送資料至所欲目的地終端時， 、、、而首先MAP通話。AP於是橋路或路由資訊至所欲目的地。 因此在此模式中，WLAN通信系統之一处控制Bss或單元中 之傳輸。 媒體存取控制(MAC)協定被限定協調分享該波段之 士六用戶之頻道使用。此等協定係基於避免用戶間同 呀子取頻道之衝犬。協定之效率以成功之避免衝突而衡量。 使用之二協定為CSMa/ca及以 。二協定可感測出其他傳輸之載波。以太網可以不 ’接，包括以太網網路集線器及以太網關。以太網 5 二二網開關在來自終端之包封每次到達_作。 之地址，瞭解其連接至何埠，及在二實體 制娜接。該以太網開關之優點為，MAC不能感 線器將中央點之連接集中為-點至多點連接，而不影 有:= 封直接=:、泉裔不檢不地址資訊。以太網路開關僅發出包 t =疋之目的地’結果導致可用帶寬之更有效利用。 而^ΠΑΝ处無朗日細—她上之毅頻率，因 協疋效率。以太網開關已證明可大幅改善以 疋之效率。 夕’ ί終齡享_媒料，需要―能改進無線點至 多點網路之性能之方法。 【發明内容】 在一基本服務系統或包含切換存取點(SAP)之單元，以 傳輸及接收-點至多點通信自及至各用戶之—種益線 LAN(WLAN)系財。在SAP魏數辦可_用，以非永久 頻率指定之能力及動態或偽_载波指定之能力，每一被指 定-獨特紐醉關_戶間之通信，以防止衝突。⑽ 之另-貫施例利用波束形成以提供空間埠指定給複數個用 戶0 【實施方式】 1332782 第1A圖顯示一系統，其應用以太網路切換原則於一存取 點(ΑΡ)，以操作多頻率，俾該Αρ變成一切換存取點(SAp)i〇6。 頻率載波fl-f5被認為SAP中不同埠處理，自SAp，該用戶終端 101-105以控制方式具有集中之存取至頻率載波n_f5。 如第1A圖所示，每一用戶終端1〇1_1〇5被指定一頻率載波 fl-f5，SAP106有能力接收及發射每一載波fl_f5。為避免永久 指定載波fl-f5給每一用戶終端101_1〇5，可使用二種方法。在 較佳實施财，理想是但非必要，柯久紋触給用戶終端 101-105。一非永久指定可避免指定給一不發射資料之一终 端。當更多終端較可用頻率多時，如一永久指定之頻率終端而 不使用該頻率時，一有發射資料之終端可被防止指定頻率。 一動態載波指定DCA計劃可予應用，其中，用戶終瑞 101-:〇5在共享紐巾發^請求傳輸(RTS)，於是SAp以可以傳 輸(CTS)回答，指出該載波可用來供傳輸之用。 或者，可利用一跳頻計劃，其中，用戶終端1〇1_1〇5具有 一偽隨機順序以改變載波，由用戶終端1〇1_1〇5及SApi〇6稱為 先驗，以便使二用戶終端同時利用相同載波之可能性最小。根 據目前802.11b標準發展之較佳1ΑΝ，三載波供跳頻之用。 但802_lla&準中，八載波供跳頻之用。無線切換系統丨⑻可利 用DCA及跳頻或分別及組合使用。 第1B圖說明一較佳用戶終端及利用多頻率之SAp。SAp 106有一頻率指定裝置120以指定頻率（頻率槔）給用戶終端 lOi-105。一多頻率接收機丨18接收自終端1〇M〇5利用指定之 頻率崞發出之料。-多頻率發職116自-終端至另一終端 利用目的地終端之指定頻率發射資料。多頻率發射機116較佳 7 亦發射指定至終端1〇1_1〇5。一天線122或天線列用以發出及接 收由SAP106之資料於資料介面124上。 終端101-105有一多頻率接收機114以接收頻率指定，及在 終端之指定頻率上恢復發射之資料。一頻率控制器1〇8利用接 收之指定頻率以控制終端1〇1_1〇5之發射及接收頻率。一多頻 率發射機110在指定頻率上發射資料。 第2A圖顯示無線切換之另一實施例，其指定每一用戶終 端201_205以空間埠而非特殊頻率如第2A圖所示，空間波朿 bl-b5由波束形成建立，可用以作為埠以便將用戶終端2〇丨_2〇5 彼此隔離。SAP206可辨認每一用戶終端2〇1_2〇5之目的地之地 址，及將波束與每一地址關連。SAp2〇6能同時接收一個以上 之波束。 第2B圖說明較佳用戶終端及利用空間波束之SAP。該 SAP206有-波束控制器22〇以決定何一波束(空間埠)與一特別 用戶有關。該㈣H22()提供—波束職發射機216及波束形成 接收機218做束資訊之用，俾-適當空間埠絲供-指定之 終端。-山天線陣列214用來在無線介面222上傳輸及接收資料。 終端201德具有—波束形祕收機⑽，以接收利用天線 陣列212發射之貧料。波束形成發射機观利用天線陣列發 射資料至SAP206。 Λ 雖然’第1八’13，从及_中之系統構型顯示五細 ^終端，任何數目之用戶終端均可使用。其目的為示範 =統能力範圍。第1^2Α圖中之無線切換系統可分別使用 2合使用。為朗之計，用戶終柳MQ5可由空間波束及 項率之組合加以區別。第1A&2A圖之無線切齡統可應用於 1332782 包括以下系統，但不限於，直接順序(D^WLAN及正交頻率區 分多工(OFDM) WLAN系統。 【圖式簡單說明】 第1A圖顯示具有頻率載波以太網路琿之一 wlan之系統圖。 第1B圖顯示一簡化之用戶終端及利用頻率載波以太網路埠 之切換存取點之略圖。 第2A圖顯示具有空間波束以太網路埠之ιΑΝ之系統圖。 第2B圖顯示用戶終端及利用空間波東以太網路琿之切換存 取點之簡化圖。 [主要元件符號說明】 100 無線切換系統 106、206切換存取點(SAP) 110、116多頻率發射機 120頻率指定裝置 124、222無線介面 212、214天線陣列 220波束控制器 101-105、201-205 用戶終端 108 頻率控制器 114、118多頻率接收機 112、122 天線 208、216波束形成發射機 210、218波束形成接收機

Claims (1)

1332782 、申請專利範固
1. 一種無線區域網路(WLAN)用戶終端，包含： 一多頻率發射器，用於發射一請求發送訊息以及用於以空間 埠與發射載波的一指定獨特組合來發射資料； 一多頻率接收器，用於在一第一頻率接收一清除發送信號， 並以空間波束與接收載波的一指定獨特組合來接收資料；以及 -頻率控制器’可運作地_至該多頻率接㈣ ==除;終端的指i發W 載波指定。 ,、、。唬礼不一偽隨機發射與接收
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TW95124221A 2002-07-05 2003-07-03 Method for performing wireless switching TWI332782B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39415102P 2002-07-05 2002-07-05
US10/334,858 US20040004951A1 (en) 2002-07-05 2002-12-31 Method for performing wireless switching

Publications (2)

Publication Number Publication Date
TW200721866A TW200721866A (en) 2007-06-01
TWI332782B true TWI332782B (en) 2010-11-01

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Application Number Title Priority Date Filing Date
TW95124221A TWI332782B (en) 2002-07-05 2003-07-03 Method for performing wireless switching
TW93105233A TWI357735B (en) 2002-07-05 2003-07-03 Method for performing wireless switching
TW92118253A TWI276327B (en) 2002-07-05 2003-07-03 Wireless LAN (WLAN) system and WLAN user terminal

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TW93105233A TWI357735B (en) 2002-07-05 2003-07-03 Method for performing wireless switching
TW92118253A TWI276327B (en) 2002-07-05 2003-07-03 Wireless LAN (WLAN) system and WLAN user terminal

Country Status (18)

Country Link
US (5) US20040004951A1 (zh)
EP (2) EP1895716B1 (zh)
JP (5) JP2005532737A (zh)
KR (4) KR20090066333A (zh)
CN (3) CN1666191B (zh)
AT (2) ATE538558T1 (zh)
AU (1) AU2003281428A1 (zh)
BR (1) BR0312546A (zh)
CA (3) CA2491631C (zh)
DE (1) DE60318322T2 (zh)
DK (1) DK1540504T3 (zh)
ES (1) ES2297180T3 (zh)
HK (2) HK1075723A1 (zh)
IL (2) IL166161A0 (zh)
MX (1) MXPA05000355A (zh)
NO (1) NO20050295L (zh)
TW (3) TWI332782B (zh)
WO (1) WO2004006117A1 (zh)

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