US20040004951A1 - Method for performing wireless switching - Google Patents

Method for performing wireless switching Download PDF

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Publication number
US20040004951A1
US20040004951A1 US10/334,858 US33485802A US2004004951A1 US 20040004951 A1 US20040004951 A1 US 20040004951A1 US 33485802 A US33485802 A US 33485802A US 2004004951 A1 US2004004951 A1 US 2004004951A1
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US
United States
Prior art keywords
users
sap
frequency
assigned
carrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/334,858
Other languages
English (en)
Inventor
Juan Zuniga
Teresa Hunkeler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
InterDigital Technology Corp
Original Assignee
InterDigital Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by InterDigital Technology Corp filed Critical InterDigital Technology Corp
Priority to US10/334,858 priority Critical patent/US20040004951A1/en
Assigned to INTERDIGITAL TECHNOLOGY CORPORATION reassignment INTERDIGITAL TECHNOLOGY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HUNKELER, TERESA, ZUNIGA, JUAN CARLOS
Priority to AT03742391T priority patent/ATE382168T1/de
Priority to PCT/US2003/020823 priority patent/WO2004006117A1/en
Priority to ES03742391T priority patent/ES2297180T3/es
Priority to KR1020057018394A priority patent/KR101037645B1/ko
Priority to KR1020097022371A priority patent/KR100973244B1/ko
Priority to CA2869462A priority patent/CA2869462C/en
Priority to CA 2689852 priority patent/CA2689852C/en
Priority to EP07150280A priority patent/EP1895716B1/en
Priority to KR1020097010763A priority patent/KR20090066333A/ko
Priority to MXPA05000355A priority patent/MXPA05000355A/es
Priority to CA 2491631 priority patent/CA2491631C/en
Priority to DE2003618322 priority patent/DE60318322T2/de
Priority to CN2007101527695A priority patent/CN101132333B/zh
Priority to EP20030742391 priority patent/EP1540504B1/en
Priority to CN201010143544A priority patent/CN101772040A/zh
Priority to DK03742391T priority patent/DK1540504T3/da
Priority to BR0312546A priority patent/BR0312546A/pt
Priority to CN038159236A priority patent/CN1666191B/zh
Priority to AU2003281428A priority patent/AU2003281428A1/en
Priority to KR20057000201A priority patent/KR100973241B1/ko
Priority to AT07150280T priority patent/ATE538558T1/de
Priority to JP2004519768A priority patent/JP2005532737A/ja
Priority to TW92118253A priority patent/TWI276327B/zh
Priority to TW93105233A priority patent/TWI357735B/zh
Priority to TW95124221A priority patent/TWI332782B/zh
Publication of US20040004951A1 publication Critical patent/US20040004951A1/en
Priority to IL16616105A priority patent/IL166161A0/xx
Priority to NO20050295A priority patent/NO20050295L/no
Priority to HK05109547A priority patent/HK1075723A1/xx
Priority to JP2006009009A priority patent/JP5010146B2/ja
Priority to HK08109466A priority patent/HK1113880A1/xx
Priority to IL203390A priority patent/IL203390A0/en
Priority to US13/113,713 priority patent/US8917660B2/en
Priority to JP2012004933A priority patent/JP2012090336A/ja
Priority to JP2013188589A priority patent/JP2014030225A/ja
Priority to JP2014225567A priority patent/JP2015046935A/ja
Priority to US14/539,456 priority patent/US9712294B2/en
Priority to US15/636,900 priority patent/US10116421B2/en
Priority to US16/173,512 priority patent/US11171749B2/en
Abandoned legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a Wireless LAN system (WLAN) with several users connected. More particularly, switching of WLAN systems for avoiding collisions.
  • WLAN Wireless LAN
  • WLAN systems make use of the unlicensed bands for wireless communication.
  • Transmissions of a wireless LAN (WLAN) communication system may be from a particular terminal to a desired destination, either another terminal within the same Basic Service System (BSS) or the backbone network, but always within the same carrier.
  • BSS Basic Service System
  • ad-hoc mode terminals can talk to each other in a multipoint-to-multipoint fashion.
  • an access point (AP) acts as a base station to control the transmissions among users, thus providing a point-to-multipoint wireless network. Since all the users share the same medium in a WLAN, the infrastructure mode becomes more efficient for semi-heavy to heavy loaded networks.
  • the terminal In an infrastructure mode, the terminal first communicates with the AP when sending data to a desired destination terminal.
  • the AP in turn bridges or routes the information to the desired destination.
  • an AP of a WLAN communication system controls the transmissions within a BSS or cell.
  • MAC protocols are defined to coordinate the channel usage for WLAN users sharing the band. These MAC protocols are based upon avoiding collisions between users as several users access the channel at the same time. The efficiency of a protocol is gauged by successful avoidance of collisions.
  • Two protocols used by WLAN are CSMA/CA MAC and CSMA/CD Ethernet protocol. Both protocols can sense the carrier for other transmissions.
  • An Ethernet can be connected in various manners, including Ethernet hubs and Ethernet switches.
  • An Ethernet hub concentrates the connections in a central point as a point-to-multipoint connection, with no impact on performance.
  • An Ethernet switch operates every time that there is a packet arrival from a terminal. The switch reads the destination address, learns on which port it is connected and makes a direct connection between the two physical ports.
  • the advantage of the Ethernet switch is that the MAC does not sense any other user in the medium, which improves performance through reduced probability of collisions and enhanced throughput as compared to an Ethernet hub.
  • An Ethernet hub forwards a received packet to all users, even when there is only one intended receiver. The hub does not look at address information. The Ethernet switch only sends the packet directly to the intended destination, resulting in a more efficient usage of the available bandwidth.
  • a common WLAN AP is not capable of using more than one carrier frequency at the same time, which results in low protocol efficiency.
  • Ethernet switches have proven to improve the efficiency of the Ethernet protocol considerably.
  • 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 point-to-multipoint communications to and from the users.
  • SAP switching access point
  • a plurality of ports are available at the SAP, each of which assigned to a unique carrier frequency for isolating communications among the users to prevent collisions, with the ability of frequency assignment to be non-permanent, and a capability of dynamic or pseudo-random carrier assignment.
  • An alternative embodiment of the SAP uses beamforming to provide spatial ports for assignments to the plurality of users.
  • FIG. 1A shows a system diagram of a WLAN with frequency carrier Ethernet ports.
  • FIG. 1B shows a simplified diagram of a user terminal and a switching access point using frequency carrier Ethernet ports.
  • FIG. 2A shows a system diagram of a WLAN with spatial beam Ethernet ports.
  • FIG. 2B shows a simplified diagram of a user terminal and a switching access point using spatial beam Ethernet ports.
  • FIG. 1A shows a system that applies the Ethernet switch principle to an access point (AP), allowing multi-frequency operation, so that the AP becomes a Switching Access Point (SAP) 106 .
  • Frequency carriers f 1 -f 5 are treated as different ports in the SAP, from which user terminals 101 - 105 have centralized access to frequency carriers f 1 -f 5 in a controlled manner.
  • each user terminal 101 - 105 is assigned to a frequency carrier f 1 -f 5 and SAP 106 is capable of receiving and transmitting each carrier f 1 -f 5 .
  • SAP 106 is capable of receiving and transmitting each carrier f 1 -f 5 .
  • two approaches may be used.
  • a non-permanent assignment avoids assigning a frequency to a terminal not sending data. When there are more terminals than available frequencies, a terminal that has data to send can be prevented from doing so if the terminal permanently assigned to a frequency is not using it.
  • a dynamic carrier assignation (DCA) scheme can be applied, in which user terminals 101 - 105 send a request-to-send (RTS) in a shared carrier and then the SAP replies with a clear-to-send (CTS) indicating the carrier that can be used for the transmission.
  • RTS request-to-send
  • CTS clear-to-send
  • a frequency hopping scheme may be used, in which user terminals 101 - 105 have a pseudo-random sequence for changing carriers, known a priori by user terminals 101 - 105 and SAP 106 , to minimize the probability of two user terminals simultaneously using the same carrier.
  • a preferred WLAN developed according to the current 802.11b standard three carriers are used for frequency hopping.
  • 802.11a standard eight carriers are used for frequency hopping.
  • Wireless switching system 100 may employ DCA and frequency hopping either separately or combined.
  • FIG. 1B is an illustration of a preferred user terminal and SAP using multiple frequencies.
  • the SAP 106 has a frequency assignment device 120 for assigning frequencies (frequency ports) to the user terminals 101 - 105 .
  • a multiple frequency receiver 118 receives data sent by the terminals 101 - 105 using the assigned frequency port.
  • a multiple frequency transmitter 116 sends data from one terminal to another using the assigned frequency of the destination terminal.
  • the multiple frequency transmitter 116 preferably also transmits the frequency assignment to the terminals 101 - 105 .
  • An antenna 122 or antenna array is used to send and receive data by the SAP 106 over the wireless interface 124 .
  • the terminals 101 - 105 have a multiple frequency receiver 114 for receiving the frequency assignment and recovers the transmitted data over the terminal's assigned frequency.
  • a frequency controller 108 users the received assigned frequencies to control the transmission and reception frequencies of the terminal 101 - 105 .
  • a multiple frequency transmitter 110 transmits the data over the assigned frequency.
  • FIG. 2A shows an alternative embodiment of wireless switching by assigning each user terminal 201 - 205 to a spatial port instead of a particular frequency.
  • spatial beams b 1 -b 5 are created by beamforming and can be used as ports to isolate user terminals 201 - 206 from each other.
  • SAP 206 recognizes the destination address of each user terminal 201 - 205 , and associates a beam to each address.
  • SAP 206 is capable of receiving more than one beam at the same time.
  • FIG. 2B is an illustration of a preferred user terminal and SAP using spatial beams.
  • the SAP 206 has a beam controller 220 for determining which beam (spatial port) is associated with a particular user.
  • the controller 220 provides a beamforming transmitter 216 and a beamforming receiver 218 the beam information so that the appropriate spatial port is used for a given terminal.
  • An antenna array 214 is used to send and receive data over the wireless interface 222 .
  • the terminals 201 - 205 have a beamforming receiver 210 for receiving transmitted data using an antenna array 212 .
  • a beamforming transmitter 208 is used to transmit data to the SAP 206 using the array 212 .
  • FIGS. 1A, 1B, 2 A and 2 B show five user terminals, any number of user terminals may be used. The intent is to demonstrate and not to limit or restrict the scope of the system capabilities.
  • the wireless switching systems of FIGS. 1A and 2A can be used separately or combined. To illustrate, user terminals 101 - 105 can be distinguished by a combination of spatial beam and frequency.
  • the wireless switching systems of FIGS. 1A and 2A can be applied to systems including, but not limited to, direct sequence (DS) WLAN and orthogonal frequency division multiplexing (OFDM) WLAN systems.
  • DS direct sequence
  • OFDM orthogonal frequency division multiplexing

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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)
  • Radio Transmission System (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Liquid Developers In Electrophotography (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
US10/334,858 2002-07-05 2002-12-31 Method for performing wireless switching Abandoned US20040004951A1 (en)

Priority Applications (39)

Application Number Priority Date Filing Date Title
US10/334,858 US20040004951A1 (en) 2002-07-05 2002-12-31 Method for performing wireless switching
KR20057000201A KR100973241B1 (ko) 2002-07-05 2003-07-02 무선 스위칭 수행 방법
AT07150280T ATE538558T1 (de) 2002-07-05 2003-07-02 Verfahren zur durchführung einer drahtlosen vermittlung
JP2004519768A JP2005532737A (ja) 2002-07-05 2003-07-02 無線スイッチングを実行する方法
ES03742391T ES2297180T3 (es) 2002-07-05 2003-07-02 Metodo para realizar un conmutacion inalambrica.
KR1020057018394A KR101037645B1 (ko) 2002-07-05 2003-07-02 무선 스위칭 수행 방법
KR1020097022371A KR100973244B1 (ko) 2002-07-05 2003-07-02 무선 스위칭 수행 방법
CA2869462A CA2869462C (en) 2002-07-05 2003-07-02 Method for performing wireless switching
AU2003281428A AU2003281428A1 (en) 2002-07-05 2003-07-02 Method for performing wireless switching
EP07150280A EP1895716B1 (en) 2002-07-05 2003-07-02 Method for performing wireless switching
KR1020097010763A KR20090066333A (ko) 2002-07-05 2003-07-02 무선 스위칭 수행 방법
MXPA05000355A MXPA05000355A (es) 2002-07-05 2003-07-02 Metodo para efectuar conmutacion inalambrica.
CA 2491631 CA2491631C (en) 2002-07-05 2003-07-02 Method for performing wireless switching
DE2003618322 DE60318322T2 (de) 2002-07-05 2003-07-02 Verfahren zur durchführung einer drahtlosen vermittlung
CN2007101527695A CN101132333B (zh) 2002-07-05 2003-07-02 执行无线切换的方法
EP20030742391 EP1540504B1 (en) 2002-07-05 2003-07-02 Method for performing wireless switching
CN201010143544A CN101772040A (zh) 2002-07-05 2003-07-02 执行无线切换的方法
PCT/US2003/020823 WO2004006117A1 (en) 2002-07-05 2003-07-02 Method for performing wireless switching
BR0312546A BR0312546A (pt) 2002-07-05 2003-07-02 Método para realizar chaveamento sem fio
AT03742391T ATE382168T1 (de) 2002-07-05 2003-07-02 Verfahren zur durchführung einer drahtlosen vermittlung
CA 2689852 CA2689852C (en) 2002-07-05 2003-07-02 Method for performing wireless switching
DK03742391T DK1540504T3 (da) 2002-07-05 2003-07-02 Fremgangsmåde til at foretage trådlöse skift
CN038159236A CN1666191B (zh) 2002-07-05 2003-07-02 执行无线切换的方法
TW95124221A TWI332782B (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
TW93105233A TWI357735B (en) 2002-07-05 2003-07-03 Method for performing wireless switching
IL16616105A IL166161A0 (en) 2002-07-05 2005-01-05 Method for performing wireless switching
NO20050295A NO20050295L (no) 2002-07-05 2005-01-19 Fremgangsmate for a utfore tradlos bytting
HK05109547A HK1075723A1 (en) 2002-07-05 2005-10-27 Method for performing wireless switching
JP2006009009A JP5010146B2 (ja) 2002-07-05 2006-01-17 無線ｌａｎユーザ端末およびそれにより実行される方法
HK08109466A HK1113880A1 (en) 2002-07-05 2008-08-26 Method for performing wireless switching
IL203390A IL203390A0 (en) 2002-07-05 2010-01-19 Method for performing wireless switching
US13/113,713 US8917660B2 (en) 2002-07-05 2011-05-23 Method for performing wireless switching
JP2012004933A JP2012090336A (ja) 2002-07-05 2012-01-13 無線スイッチングを実行する方法
JP2013188589A JP2014030225A (ja) 2002-07-05 2013-09-11 無線スイッチングを実行する方法
JP2014225567A JP2015046935A (ja) 2002-07-05 2014-11-05 無線スイッチングを実行する方法
US14/539,456 US9712294B2 (en) 2002-07-05 2014-11-12 Method for performing wireless switching
US15/636,900 US10116421B2 (en) 2002-07-05 2017-06-29 Method for performing wireless switching
US16/173,512 US11171749B2 (en) 2002-07-05 2018-10-29 Method for performing wireless switching

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

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/113,713 Continuation US8917660B2 (en) 2002-07-05 2011-05-23 Method for performing wireless switching

Publications (1)

Publication Number Publication Date
US20040004951A1 true US20040004951A1 (en) 2004-01-08

Family

ID=30002848

Family Applications (5)

Application Number Title Priority Date Filing Date
US10/334,858 Abandoned US20040004951A1 (en) 2002-07-05 2002-12-31 Method for performing wireless switching
US13/113,713 Expired - Fee Related US8917660B2 (en) 2002-07-05 2011-05-23 Method for performing wireless switching
US14/539,456 Expired - Lifetime US9712294B2 (en) 2002-07-05 2014-11-12 Method for performing wireless switching
US15/636,900 Expired - Lifetime US10116421B2 (en) 2002-07-05 2017-06-29 Method for performing wireless switching
US16/173,512 Expired - Lifetime US11171749B2 (en) 2002-07-05 2018-10-29 Method for performing wireless switching

Family Applications After (4)

Application Number Title Priority Date Filing Date
US13/113,713 Expired - Fee Related US8917660B2 (en) 2002-07-05 2011-05-23 Method for performing wireless switching
US14/539,456 Expired - Lifetime US9712294B2 (en) 2002-07-05 2014-11-12 Method for performing wireless switching
US15/636,900 Expired - Lifetime US10116421B2 (en) 2002-07-05 2017-06-29 Method for performing wireless switching
US16/173,512 Expired - Lifetime US11171749B2 (en) 2002-07-05 2018-10-29 Method for performing wireless switching

Country Status (18)

Country Link
US (5) US20040004951A1 (xx)
EP (2) EP1540504B1 (xx)
JP (5) JP2005532737A (xx)
KR (4) KR100973244B1 (xx)
CN (3) CN101772040A (xx)
AT (2) ATE538558T1 (xx)
AU (1) AU2003281428A1 (xx)
BR (1) BR0312546A (xx)
CA (3) CA2869462C (xx)
DE (1) DE60318322T2 (xx)
DK (1) DK1540504T3 (xx)
ES (1) ES2297180T3 (xx)
HK (2) HK1075723A1 (xx)
IL (2) IL166161A0 (xx)
MX (1) MXPA05000355A (xx)
NO (1) NO20050295L (xx)
TW (3) TWI332782B (xx)
WO (1) WO2004006117A1 (xx)

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US20030171115A1 (en) * 2002-03-07 2003-09-11 Texas Instruments Incorporated Channelization scheme for wireless local area networks
WO2004032536A2 (en) * 2002-10-01 2004-04-15 Interdigital Technology Corporation Wireless communication method and system with controlled wtru peer-to-peer communications
US20040125778A1 (en) * 2002-12-26 2004-07-01 Newsoft Technology Corporation Method and system for improving transmission efficiency of wireless local area network
US20050029215A1 (en) * 2003-08-08 2005-02-10 Grau Curtiss A. High capacity shear mechanism
US20050141545A1 (en) * 2003-11-10 2005-06-30 Yaron Fein Performance of a wireless communication system
US20060056316A1 (en) * 2004-09-10 2006-03-16 Interdigital Technology Corporation Method and apparatus for transferring smart antenna capability information
US20060056345A1 (en) * 2004-09-10 2006-03-16 Interdigital Technology Corporation Method and system for supporting use of a smart antenna in a wireless local area network
WO2006031495A3 (en) * 2004-09-10 2006-07-13 Interdigital Tech Corp Implementing a smart antenna in a wireless local area network
US20060203784A1 (en) * 2005-03-14 2006-09-14 International Business Machines Corporation Smart roaming to avoid time-outs during WLAN association
US20060215576A1 (en) * 2005-01-05 2006-09-28 International Business Machines Corporation Switching between two communicaiton modes in a WLAN
US20060215619A1 (en) * 2003-04-09 2006-09-28 Koninklijke Philips Electronics N.V. Network with subnets being connectable via bridge terminals
US20070104138A1 (en) * 2005-11-03 2007-05-10 Interdigital Technology Corporation Method and system for performing peer-to-peer communication between stations within a basic service set
KR100884803B1 (ko) 2007-05-09 2009-02-20 삼성전자주식회사 사용자 단말기의 포트 관리 방법 및 장치
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