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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users
system
sap
frequency
assigned
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Abandoned
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US10/334,858
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Juan Zuniga
Teresa Hunkeler
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InterDigital Technology Corp
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InterDigital Technology Corp
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Priority to US39415102P priority Critical
Application filed by InterDigital Technology Corp filed Critical InterDigital Technology Corp
Priority to US10/334,858 priority 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
Publication of US20040004951A1 publication Critical patent/US20040004951A1/en
Application status is Abandoned legal-status Critical

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0023Time-frequency-space
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/0406Wireless resource allocation involving control information exchange between nodes
    • H04W72/042Wireless resource allocation involving control information exchange between nodes in downlink direction of a wireless link, i.e. towards terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation where an allocation plan is defined based on the type of the allocated resource
    • H04W72/0453Wireless resource allocation where an allocation plan is defined based on the type of the allocated resource the resource being a frequency, carrier or frequency band
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14Spectrum sharing arrangements between different networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation where an allocation plan is defined based on the type of the allocated resource
    • H04W72/046Wireless resource allocation where an allocation plan is defined based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/08Wireless resource allocation where an allocation plan is defined based on quality criteria
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10Small scale networks; Flat hierarchical networks
    • H04W84/12WLAN [Wireless Local Area Networks]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices

Abstract

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. 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.

Description

    CROSS REFERENCE TO RELATED APPLICATION
  • This application claims priority from U.S. Provisional Application No. 60/394,151, filed on Jul. 5, 2002, which is incorporated by reference as if fully set forth. [0001]
  • FIELD OF INVENTION
  • The present invention relates to a Wireless LAN system (WLAN) with several users connected. More particularly, switching of WLAN systems for avoiding collisions. [0002]
  • BACKGROUND
  • 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. There are two modes of operation for WLAN systems: ad-hoc and infrastructure. In the ad-hoc mode, terminals can talk to each other in a multipoint-to-multipoint fashion. In the infrastructure mode, 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. [0003]
  • 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. Thus, in this mode, an AP of a WLAN communication system controls the transmissions within a BSS or cell. [0004]
  • Medium Access Control (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. [0005]
  • 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. [0006]
  • 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. [0007]
  • Therefore, what is needed is a method for improving the performance of a wireless point-to-multipoint network when the terminals share the same medium. [0008]
  • SUMMARY
  • 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. 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.[0009]
  • BRIEF DESCRIPTION OF THE DRAWING(S)
  • FIG. 1A shows a system diagram of a WLAN with frequency carrier Ethernet ports. [0010]
  • FIG. 1B shows a simplified diagram of a user terminal and a switching access point using frequency carrier Ethernet ports. [0011]
  • FIG. 2A shows a system diagram of a WLAN with spatial beam Ethernet ports. [0012]
  • FIG. 2B shows a simplified diagram of a user terminal and a switching access point using spatial beam Ethernet ports.[0013]
  • DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • 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) [0014] 106. Frequency carriers f1-f5 are treated as different ports in the SAP, from which user terminals 101-105 have centralized access to frequency carriers f1-f5 in a controlled manner.
  • As shown in FIG. 1A, each user terminal [0015] 101-105 is assigned to a frequency carrier f1-f5 and SAP 106 is capable of receiving and transmitting each carrier f1-f5. In order to avoid permanent assignment of carriers f1-f5 to each user terminal 101-105, two approaches may be used. In the preferred embodiment, it is desirable, although not essential, to not permanently assign carriers to user terminals 101-105. 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 [0016] 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.
  • Alternatively, a frequency hopping scheme may be used, in which user terminals [0017] 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. For a preferred WLAN developed according to the current 802.11b standard, three carriers are used for frequency hopping. For the 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 [0018] 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 [0019] 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 [0020] 201-205 to a spatial port instead of a particular frequency. As shown in FIG. 2A, spatial beams b1-b5 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 [0021] 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 [0022] 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.
  • Although the system configurations of FIGS. 1A, 1B, [0023] 2A and 2B 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.

Claims (9)

What is claimed is:
1. 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; and
a plurality of ports, each of which assigned to a unique carrier frequency for isolating communications among the users to prevent collisions;
wherein said assignment of frequencies is not permanent, and instead has capability of dynamic or pseudo-random carrier assignment.
2. The system of claim 1 wherein said not permanent assignment is the dynamic carrier assignment which is achieved by request-to-send signals from the users and clear-to-send signals from the SAP.
3. The system of claim 1 wherein said clear-to-send signals indicate a frequency assigned to the users.
4. The system of claim 1 wherein said clear-to-send signals indicate a pseudo-random carrier assignment to the users.
5. The system of claim 1 whereby said pseudo-random carrier assignment is achieved by frequency hopping of the users along a sequence of changing carriers, said sequence known a priori by the users and the SAP.
6. 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; and
a plurality of ports, each of which assigned to a unique spatial beam for isolating communications among the users to prevent collisions;
wherein the SAP receives more than one spatial beam at once.
7. The system of claim 4 wherein beamforming is used to create said spatial ports.
8. A wireless LAN (WLAN) user terminal comprising:
a multiple frequency transmitter for transmitting a request-to-send message and for transmitting data over an assigned transmit carrier;
a multiple frequency receiver for receiving a clear-to-send signal over a first frequency and for receiving data over an assigned receive carrier; and
a frequency controller, operatively coupled to the multiple frequency receiver, for determining the assigned transmit and the assigned receive carrier of the user terminal using the received clear-to-send signal.
9. The WLAN user terminal of claim 8 wherein the clear-to-send signal indicating a pseudo-random transmit and receive carrier assignment.
US10/334,858 2002-07-05 2002-12-31 Method for performing wireless switching Abandoned US20040004951A1 (en)

Priority Applications (2)

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

Applications Claiming Priority (39)

Application Number Priority Date Filing Date Title
US10/334,858 US20040004951A1 (en) 2002-07-05 2002-12-31 Method for performing wireless switching
AT03742391T AT382168T (en) 2002-07-05 2003-07-02 Method for carrying out a wireless interconnection
DE2003618322 DE60318322T2 (en) 2002-07-05 2003-07-02 Method for carrying out a wireless interconnection
JP2004519768A JP2005532737A (en) 2002-07-05 2003-07-02 How to perform radio switching
CN 03815923 CN1666191B (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
AT07150280T AT538558T (en) 2002-07-05 2003-07-02 Method for carrying out a wireless interconnection
CA2869462A CA2869462C (en) 2002-07-05 2003-07-02 Method for performing wireless switching
PCT/US2003/020823 WO2004006117A1 (en) 2002-07-05 2003-07-02 Method for performing wireless switching
MXPA05000355A MXPA05000355A (en) 2002-07-05 2003-07-02 Method for performing wireless switching.
ES03742391T ES2297180T3 (en) 2002-07-05 2003-07-02 Method for performing a wireless switch.
DK03742391T DK1540504T3 (en) 2002-07-05 2003-07-02 Method of making wireless shifts
BR0312546A BR0312546A (en) 2002-07-05 2003-07-02 Method to perform wireless switching
KR20097022371A KR100973244B1 (en) 2002-07-05 2003-07-02 Method for performing wireless switching
CA 2689852 CA2689852C (en) 2002-07-05 2003-07-02 Method for performing wireless switching
EP20030742391 EP1540504B1 (en) 2002-07-05 2003-07-02 Method for performing wireless switching
KR20057000201A KR100973241B1 (en) 2002-07-05 2003-07-02 Method for performing wireless switching
KR20097010763A KR20090066333A (en) 2002-07-05 2003-07-02 Method for performing wireless switching
KR20057018394A KR101037645B1 (en) 2002-07-05 2003-07-02 Method for performing wireless switching
CN 200710152769 CN101132333B (en) 2002-07-05 2003-07-02 Method for performing wireless switching
EP20070150280 EP1895716B1 (en) 2002-07-05 2003-07-02 Method for performing wireless switching
CN 201010143544 CN101772040A (en) 2002-07-05 2003-07-02 Method for performing wireless switching
CA 2491631 CA2491631C (en) 2002-07-05 2003-07-02 Method for performing wireless switching
TW93105233A TWI357735B (en) 2002-07-05 2003-07-03 Method for performing wireless switching
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
IL16616105A IL166161D0 (en) 2002-07-05 2005-01-05 Method for performing wireless switching
NO20050295A NO20050295L (en) 2002-07-05 2005-01-19 Progress Mate for a performing Cordless switching
HK05109547A HK1075723A1 (en) 2002-07-05 2005-10-27 Method for performing wireless switching
JP2006009009A JP5010146B2 (en) 2002-07-05 2006-01-17 Wireless LAN user terminal and method executed thereby
HK08109466A HK1113880A1 (en) 2002-07-05 2008-08-26 Method for performing wireless switching
IL20339010A IL203390D0 (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 (en) 2002-07-05 2012-01-13 Method for performing wireless switching
JP2013188589A JP2014030225A (en) 2002-07-05 2013-09-11 Method for performing wireless switching
JP2014225567A JP2015046935A (en) 2002-07-05 2014-11-05 Method for performing wireless switching
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 US20190068339A1 (en) 2002-07-05 2018-10-29 Method for performing wireless switching

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US13/113,713 Continuation US8917660B2 (en) 2002-07-05 2011-05-23 Method for performing wireless switching

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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 Active US9712294B2 (en) 2002-07-05 2014-11-12 Method for performing wireless switching
US15/636,900 Active US10116421B2 (en) 2002-07-05 2017-06-29 Method for performing wireless switching
US16/173,512 Pending US20190068339A1 (en) 2002-07-05 2018-10-29 Method for performing wireless switching

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US13/113,713 Expired - Fee Related US8917660B2 (en) 2002-07-05 2011-05-23 Method for performing wireless switching
US14/539,456 Active US9712294B2 (en) 2002-07-05 2014-11-12 Method for performing wireless switching
US15/636,900 Active US10116421B2 (en) 2002-07-05 2017-06-29 Method for performing wireless switching
US16/173,512 Pending US20190068339A1 (en) 2002-07-05 2018-10-29 Method for performing wireless switching

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US (5) US20040004951A1 (en)
EP (2) EP1540504B1 (en)
JP (5) JP2005532737A (en)
KR (4) KR101037645B1 (en)
CN (3) CN101772040A (en)
AT (2) AT382168T (en)
AU (1) AU2003281428A1 (en)
BR (1) BR0312546A (en)
CA (3) CA2869462C (en)
DE (1) DE60318322T2 (en)
DK (1) DK1540504T3 (en)
ES (1) ES2297180T3 (en)
HK (2) HK1075723A1 (en)
IL (2) IL166161D0 (en)
MX (1) MXPA05000355A (en)
NO (1) NO20050295L (en)
TW (3) TWI276327B (en)
WO (1) WO2004006117A1 (en)

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