TWI276327B - Wireless LAN (WLAN) system and WLAN user terminal - Google Patents

Wireless LAN (WLAN) system and WLAN user terminal Download PDF

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Publication number
TWI276327B
TWI276327B TW92118253A TW92118253A TWI276327B TW I276327 B TWI276327 B TW I276327B TW 92118253 A TW92118253 A TW 92118253A TW 92118253 A TW92118253 A TW 92118253A TW I276327 B TWI276327 B TW I276327B
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sap
wlan
frequency
users
user
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TW92118253A
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TW200405697A (en
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Juan Carlos Zuniga
Teresa Joanne Hunkeler
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Interdigital Tech Corp
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    • 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
    • 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
    • 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

1276327 五、發明說明（1) 發明範圍 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。 背景 WLAN糸統利用無執照波段供無線通信。一無線lan (WLAN)通信系統可自一特別終端至一理想目的地，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 一載體内。WLAN系統有二作業模式：專案及基礎結構。專 案模式中’終端可一點至多點方式彼此通話。基本結構模 式時，一存取點（AP)作為一基站以控制用戶間之通話，因 而提供一點至多點無線網路。因所有用戶均分寒WI ΑΝ φ 一相同媒體，基本結構模式變為半繁忙至繁忙負荷之網路 更有效率。 在基本結構模式中，當發送資料至理想目的地終端 時，終端首先與AP通話。AP於是橋路或路由資訊至理想目
的地。因此在此模式中，ffLAN通信系統之一Ap控制BSS 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 W^AN用戶之頻道使用。此等MAC協定係基於避免用戶間同 時存取頻道之衝突。協定之效率以成功之避免衝突而衡 量。 WLAN使用之二協定為CSMA/CA MAC及CSMA/CD以太網 協定。二協定可感測出其他傳輸之載體。以太網可以不同
第5頁 1276327 五、發明說明（2) :f :哭：t I太網網路集線器及以太網開關。以* 將點之連接集中為-點至多點連接：網 作：該開關讀取目的地之地址，瞭解其連接達時操 MAC不能感測媒體中之任何用戶，與以太網：：二為， 二’：而：由衝突降低可能性及可改進輸出量而改盖性 :僅右二路集線器將接收之包封傳輸至所有用戶，即 使有個接收者亦如此。該網路集線器不檢示地 訊。以太網路開關僅發出包封直接至預定之目的地，社 導致可用帶寬之更有效利用。 、、、σ呆 一般WLAN ΑΡ無法同時利用一個以上之載波頻率，因 而引起低協定效率。以太網開關已證明可大幅改善以太網 協定之效率。 因此’當終端分享相同媒體時，需要一能改進無線點 至多點網路之性能之方法。 本發明概述 Ψ 在一基本服務系統或包含切換存取點（SAP)之單元， 以傳輸及接收一點至多點通信自及至各用戶之一種無線 LAN(WLAN)系統中。在SAP有複數個埠可資利用，以非永久 頻率指定之能力及動態或偽隨機載體指定之能力，每一被 ♦曰疋一獨特載波頻率以隔離用戶間之通信，以防止衝 突。SAP之另一實施例利用波束形成以提供空間埠指定給 複數個用戶。
第6頁 1276327 五、發明說明（3) 較佳實施例之說明 第1 A圖顯示一系統，其應用以太網路切換原則於一存 取點（AP)，以操作多頻率，俾該AP變成一切換存取點 (SAP) 1 06。頻率載體fi-f5被認為SAP中不同埠處理，自 SAP，δ亥用戶終端ιοί —1〇5以控制方式具有集中之存取至頻 率載體f l-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 載體f 1-f 5，SAP106有能力接收及發射每一載體f丨―f 5。為 避免永久指定載體fl-f5給每一用戶終端1〇1_1〇5，可使用 二種方法。在較佳實施例中，理想是但非必要，不永久指 定載體給用戶終端05。一非永久指定可避免指定給 不發射負料之一終端。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。 一動態載體指定DCA計劃可予應用，其中，用戶終端 101-105在共享載體中發出請求傳輸（RTS)，於是SAp以可 以傳^(CTS)回答，指出該載體可用來供傳輸之用。 或者’可利用一跳頻計劃，其中，用戶終端丨〇 i —丨〇 5 具有一偽隨機順序以改變載體，由用戶終端丨〇卜丨〇 5及 SAPj 0 6，為先驗，以便使二用戶終端同時利用相同載體之 可此性最小。根據目前802· 1 lb標準發展之較佳WLAN，三 Ϊ體供跳狀用。但802· lla標準中，人載體供跳頻之 無、線切換系統1 00可利用DCA及跳頻或分別及組合使
1276327 五、發明說明（4) 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（頻率埠）給用戶終端 UH-105。一多頻率接收機118接收自終端1〇1 一 1〇5利用指 定之頻率埠發出之資料。一多頻率發射機116自一終端至 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較佳亦發射指定至終端1〇卜1〇5。一天線122或天 線列用以發出及接收由SAP1 06之資料於資料介面124上。 終端10卜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 108利用接收之指定頻率以控制終端1〇卜1〇5之發^及接收 頻率。一多頻率發射機110在指定頻率上發射資料。 弟2 Α圖顯示無線切換之另一實施例，其指定每一用戶 終端2 0 1 - 2 0 5以空間埠而非特殊頻率如第2 a圖所示，空間 波束b 1 - b 5由波束形成建立，可用以作為埠以便將用戶終 端201-206彼此隔離。SAP2 0 6可辨認每一用戶終端2〇1-205 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 SAP2 0 6有一波束控制器22 0以決定何一波束（空間埠）與一 特別用戶有關。該控制器220提供一波束形成發射機21 6及 波束形成接收機2 1 8供波束資訊之用，俾一適當空間埠用 來供一指定之終端。一天線陣列2 1 4用來在無線介面2 2 2上 傳輸及接收資料。 終端20卜205具有一波束形成接收機210，以接收利用
第8頁 1276327 五、發明說明（5) 天線陣列212發射之資料。波束形成發射機208利用天線陣 列212發射資料至SAP206。 雖然，第1A，IB，2A及2B圖中之系統構型顯示五個 用戶終端，任何數目之用戶終端均可使用。其目的為示範 而非限制系統能力範圍。第1A及2A圖中之無線切換系統可 分別使用或聯合使用。為說明之計，用戶終端丨(Π 一丨〇 5可 由空間波束及頻率之組合加以區別。第1Α及2 Α圖之無線切 換系統可應用於包括以下系統，但不限於，直接順序（DS ) WLAN及正交頻率區分多工（OFDM)WLAN系統。
I276327_ 圖式簡單說明 第1A圖顯示具有頻率載體以太網路埠之—WLAN之系統圖。 第1 B圖顯示一簡化之用戶終端及利用頻率載體以太網路埠 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WLAN之系統圖。 第2B圖顯示用戶終端及利用空間波束以太網路埠之切換存 取點之簡化圖。 元件符號說明： 10 0 無線切換系統 1 1 0、11 6 多頻率發射機 12 0 頻率指定裝置 124、222 無線介面 2 1 2、2 1 4 天線陣列 2 2 0 波束控制器 106、206 切換存取點（SAP) 101-105、20 1 -205 用戶終端 108 頻率控制器 11 4、11 8 多頻率接收機 112、122 天線 2 0 8、2 1 6 波束形成發射機 210、218 波束形成接收機
第10頁

Claims (1)

  1. fmrnmma^ 年月日 修正 六、申請專利範圍 1. 一種無線L A N ( W L A N )系統，用於在一基本服務系統或胞 元内之複數個用戶間之通信，包含： 一切換存取點（SAP)，用以傳輸及接收一點至多點之通 信至及自各用戶；及 複數個埠，每一埠被指定一獨特載體頻率，以隔離用戶 間之通信以防止衝突； ^ 其中該頻率指定並非永久，反之，有一動態或偽隨機載 體指定之能力。 2.如申請專利範圍第1項之系統，其中該非永久指定為 動態載體指定，其係以自用戶之請求發送信號及自SAP之 清除發送信號來達成。 3 ·如申請專利範圍第1項之系統，其中該核准傳送信號 指示一指定給用戶之頻率。 4 ·如申請專利範圍第1項之系統，其中該核准傳送信號 指示給用戶之偽隨機載體指定。 5 ·如申請專利範圍第1項之系統，其中該偽隨機載體指 定係由用戶沿改變載體之順序跳頻而達成，該順序由用戶 及SAP稱為先驗。 6.—種無線LAN(WLAN)系統’用於在一基本服務系統或 胞元内之複數個用戶間之通信，包含： 一切換存取點（SAP )，用以發射及接收一點至多點之通 信至及自各用戶；及 複數個埠，每一埠被指定一獨特空間波束，以隔離用戶 螫 間之通信以防止衝突；
    第11頁 I 8253 曰 修正 六、申請專利範圍 其中該SAP—次接收一個以上之空間波束。 7. 如申請專利範圍第6項之系統，其中波束形成用來建 立該空間埠。 8. —種無線LAN(WLAN)用戶終端，包含： 一多頻發射機，用以發射請求發送訊息，及在指定之發 射載體上發射資料； 一多頻接收機，用以在第一頻率接收核准傳輸信號，及 在指定之接收載體上接收資料；及 一頻率控制器，可操作地耦合至多頻接收機，利用接收 之核准傳輸信號，以決定用戶終端之指定之發射及指定之 接收載體。 9. 如申請專利範圍第8項之WLAN用戶終端，其中該核准 傳輸信號係指一偽隨機發射及接收載體指定。 參
    第12頁 12763
    、中文發明摘要（發明名稱：無線LAN(WLAN)系統及乳删戶終端） 一種無線LAN (WLAN)系統，用於在基本服務系統或胞 疋内複數個用戶間之通信，包含一切換存取點（SAP)以傳 輸及接受一點至多點之通信至及自用戶。在SAp有複數個 埠可供使用，每埠被指定一獨特載體頻率，具非永久頻率 指定之能力及動態或偽隨機載體指定能力，可隔離用戶間 之通h以防止衝突。SAP之另一實施例利用波束形成以提 供空間埠以指定給複數個用戶。 五、（一） 本案代表圖為：第 1A 圖 (二）、本案代表圖之元件代表符號簡單說明： 100 無線切換系統 1〇6 切換存取點（SAP) 101 -105、2 01-205 用戶終端 六、英文發明摘要（發明名稱：Wireless LAN (WLAN) System and WLAN User Terminal) A wireless LAN (WLAN) system for communications among a plurality of users within a basic service system or cell comprising a switching access point (SAP) for transmitting and receiving poi nt-to-mu11 ipoint communications to and from the users. A plurality of ports are available at the SAP, each of which assigned to a unique carrier frequency for isolating
    第2頁
TW92118253A 2002-07-05 2003-07-03 Wireless LAN (WLAN) system and WLAN user terminal TWI276327B (en)

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US39415102P 2002-07-05 2002-07-05
US10/334,858 US20040004951A1 (en) 2002-07-05 2002-12-31 Method for performing wireless switching

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TW200405697A TW200405697A (en) 2004-04-01
TWI276327B true TWI276327B (en) 2007-03-11

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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

Country Status (18)

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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)
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