WO2005072356A2 - Services de reseau local sans fil sur reseau de teledistribution utilisant des services de reseau a acces multiple par detection de porteuse et evitement de collision - Google Patents

Services de reseau local sans fil sur reseau de teledistribution utilisant des services de reseau a acces multiple par detection de porteuse et evitement de collision Download PDF

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Publication number
WO2005072356A2
WO2005072356A2 PCT/US2005/002442 US2005002442W WO2005072356A2 WO 2005072356 A2 WO2005072356 A2 WO 2005072356A2 US 2005002442 W US2005002442 W US 2005002442W WO 2005072356 A2 WO2005072356 A2 WO 2005072356A2
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WO
WIPO (PCT)
Prior art keywords
signals
wlan
uplink
catv
wifi
Prior art date
Application number
PCT/US2005/002442
Other languages
English (en)
Other versions
WO2005072356A3 (fr
Inventor
Mordechai Zussman
Harel Golombek
Dan Shklarsky
Original Assignee
Passover, Inc.
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 Passover, Inc. filed Critical Passover, Inc.
Priority to EP05712063A priority Critical patent/EP1709825A2/fr
Publication of WO2005072356A2 publication Critical patent/WO2005072356A2/fr
Publication of WO2005072356A3 publication Critical patent/WO2005072356A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2801—Broadband local area networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6118—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving cable transmission, e.g. using a cable modem
    • 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
    • H04W88/085—Access point devices with remote components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
    • H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • 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]

Definitions

  • the invention relates to an apparatus, system, and method for implementing a new topology for Wireless Local Area Networks (WLAN) and the like, including WiFi systems. More particularly, the invention relates to an apparatus, system, and method that uses cable television (CATV) networks to support WiFi services in homes, businesses, and hotspots such as hotels, hospitals, airports with high capacity and high quality.
  • WLAN Wireless Local Area Networks
  • CATV cable television
  • a WLAN is a flexible data communication system implemented as an extension to, or as an alternative for, a wired LAN.
  • a transmitter/receiver device called a wireless access point (AP) connects the user wireless device to the wired network fixed location using standard connections (e.g., Ethernet, cable modem, ADSL, TI, etc.).
  • the AP receives, buffers, and transmits data between the WLAN and the wired network infrastructure.
  • a single AP can support a small group of users and can function within ranges of up to several hundred feet. End users access the WLAN through a WLAN modem device.
  • a related art implementation of a WLAN system is based on a Carrier
  • CSMA/CA Sense Multiple Access Collision Avoidance
  • each end unit in the network listens to the network to determine whether the path is free for transmission. Only when the path is free for transmission is the end unit allowed to transmit data. If a collision is detected, the data must be transmitted again.
  • all the units participating in the network must be able to receive all the uplink/downlink data transmitted on the network all the time in the specified coverage area. This is the reason that it is necessary in related art WLAN systems to have an AP at any floor in the building and/or every 100 to 500 feet in range, (to provide full coverage and good receiving signal performance by each of the participants in order to avoid and solve collision problems).
  • CATV networks have a network architecture designed basically to transmit signals in a top-down or bottom-up manner. In this configuration, two adjacent downstream customers cannot listen to each other. Thus, a conventional implementation of WiFi CSMA/CA is not possible on a CATV network.
  • Illustrative, non-limiting embodiments of the present invention overcome the above disadvantages and other disadvantages not described above. Also, the present invention is not required to overcome the disadvantages described above, and an illustrative, non-limiting embodiment of the present invention may not overcome any of the problems described above.
  • a WLAN is integrated with a CATV network using Point Coordination Function (PCF).
  • PCF is a centralized, polling-based access mechanism which requires the presence of an Access Point (AP) that acts as Point Coordinator.
  • AP Access Point
  • An AP controller located at the center of the CATV network manages the system. In this mode, the discussion between an end unit and a AP is controlled and no end unit is allowed to transmit data without permission of the AP.
  • the merger of the WLAN with the CATV networks according to the invention provides improved data quality, better coverage, and better range, while enhancing network capacity to support WiFi services in homes, businesses, and/or hotspot areas such as hotels, airports, hospitals and the like, using a modified CSMA/CA configuration with switching capability for homes and/or hotspots.
  • the CATV network functions as an access element within the analog portion of the WLAN system, namely in its RF propagation-radiation section.
  • the capabilities of existing CATV networks are substantially preserved in the approach, and the WLAN end users terminals do not have to be substantially modified. That is, the signals sent according to the WLAN terminal communications protocol traverse the CATV network, without the necessity for modification.
  • a number of APs can be located at the CATV head-end and/or at the CATV optical node entrance, to be integrated into the CATV network, thus increasing the capacity of the WLAN-CATV network.
  • One protocol used in the various embodiments of the invention is
  • CSMA CA with modified system configuration to support CSMA CA protocol through the CAIN network.
  • the CATN network is modified to permit the communication of the WLA ⁇ RF signals without substantial modification, just frequency up and down-conversion to fit the CATN spectrum specifications, and to enable the CATV network to support CSMA/CA protocol.
  • a conventional CATV network is a two-way network having a tree topology and including cables, amplifiers, signal splitters/combiners and filters.
  • the cables and signal splitters/combiners of the CATV network are not modified, but the other elements are.
  • the invention includes new components for a CATV system that permit multi-band communication.
  • the modified components allow all types of signals (the CATV up and down signals and the WLA ⁇ up and down signals) to be carried by the network simultaneously in a totally uncoupled manner.
  • This component modification can be implemented within the component itself (e.g. a modified CATN amplifier that supports the additional signals as well as the traditional CATV signals) or as a separated component (e.g. an additional amplifier that supports all the signals other than the traditional CATV signals).
  • EID-WiFi Enhanced In Door WiFi Unit
  • the EID-WiFi is a component, which acts as a transmit and receive antenna for the WLAN signals, and as a cable input output unit for the CATV network.
  • the EID-WiFi may work in a switching mode where the Uplink and
  • the EID-WiFi may be a dual mode unit. That is to say, the EID-WiFi is capable of receiving and transmitting in modes 802.1 lb, 802.1 lg and 802.1 la at frequencies of 2.4 GHz and 5.3 GHz correspondingly.
  • the UDC acts as a frequency converter, converting the AP WiFi signals from: a. original RF 2.4 GHz for 802.1 lb, 802.1 lg and 5.3 GHz for 802.1 la frequencies to 1080 - 1155 MHz Uplink and to 960 - 1035 MHz downlink, (or any other set of uplink, downlink frequencies within the range of 960 to 1155 MHz) and injected into the CATV network; and b. the 1080 - 1155 MHz uplink and the 960 - 1035 MHz downlink to the original RF 2.4 GHz for 802.1 lb, 802.1 lg and 5.3 GHz for 802.1 la frequencies.
  • the UDC may also convert the AP WiFi signals from original RF 2.4 GHz for 802. lib, 802.1 lg and 5.3 GHz for 802.1 la frequencies to 20 MHz bandwidth in the range of 5 - 45/65 MHz uplink and to 20 MHz bandwidth in the range of 500 - 750/860 MHz downlink, and injected into the CATV network, and vice versa converting the 5 - 45/65 MHz uplink and to 500 - 750/860 MHz downlink to the original RF 2.4 GHz for 802.1 lb, 802.1 lg and 5.3 GHz for 802.1 la frequencies.
  • the UDC is equipped with an RF sensor to detect the uplink signals and retransmit them at the downlink path to be received by the other WiFi terminal units.
  • the other WiFi terminal units may sense these signals as part of the Carrier Sense mechanism.
  • FIG. 1 illustrates a multi story building with a WLAN over CATV system working within the CATV spectrum at frequencies 5 - 45/65 MHz Uplink and 500 -
  • FIG. 2 illustrates a multi-story building with a WLAN over CATV system working out of the CATV spectrum at frequencies 1080 - 1155 MHz Uplink and 960 - 1035 MHz Downlink
  • FIG. 3 illustrates a multi-story building with a WLAN over CATV system working out of the CATV spectrum at frequencies 1080 - 1155 MHz Uplink and 960 - 1035 MHz Downlink with multiple AP units;
  • FIG. 4 illustrates a Downlink switching configuration to support
  • FIG. 5 illustrates an Uplink switching configuration to support CSMA/CA over CATV
  • FIG. 6 schematically illustrates an EID-WiFi according to an exemplary embodiment of the invention
  • FIG. 7 schematically illustrates a simplified schematic view of a WLAN
  • FIG. 8 schematically illustrates a WLAN Entrance Module (WEM).
  • WEM WLAN Entrance Module
  • FIG. 9 shows a dual mode WEM UDC module, that integrates both
  • FIG. 10 illustrates a EID-WiFi switched module UDC
  • FIG. 11 illustrates a dual mode switched EID-WiFi module
  • FIGS. 12 and 13 show the original 802.1 lb, 802.1 lg and 802.11a frequencies, respectively;
  • FIG. 14 illustrates a bandwidth allocation plan for 802.1 lb/g non- overlapping channels shifted frequency within the CATV network spectrum;
  • FIG. 15 illustrates a bandwidth allocation plan for 802.11 b, and 802.11 g overlapping channels shifted frequency within the CATV network spectrum;
  • FIG. 16 illustrates a bandwidth allocation plan for 802.11 a channels shifted to a frequency band within the CATV network spectrum; [38] FIG.
  • FIG. 17 illustrates a bandwidth allocation plan for three 802.1 lb/g non- overlapping channels shifted to a frequency band out of the CATV spectrum at frequencies: 1080 - 1155 MHz Uplink and 960 - 1035 MHz Downlink;
  • FIG. 18 illustrates a bandwidth allocation plan for multiple 802.1 lb/g overlapping channels shifted to a frequency band out of the CATV spectrum at frequencies: 1080 - 1155 MHz Uplink and 960 - 1035 MHz Downlink;
  • FIG. 19 illustrates a bandwidth allocation plan for 802.11a channels shifted to a frequency band out of the CATV spectrum at frequencies: 1080 - 1155 MHz Uplink and 960 - 1035 MHz Downlink; and
  • FIG. 20 illustrates a bandwidth allocation plan for 802.1 lb/g and/or
  • FIG. 1 shows a multi story building with a WLAN over CATV system operating within the CATV spectrum 5 - 45/65 MHz Uplink and 500 - 750/860 MHz Downlink.
  • FIG. 1 includes the WLAN Entrance Module (WEM), which converts the original WLAN RF signal to the assigned frequency spectrum to be carried on the CATV network.
  • the EID-WiFi converts the WLAN signals from the assigned frequencies at the CATV spectrum back to their original signals, and differentiates between the CATV signals to be carried to the TV or Set Top Box and the WLAN signals to be transmitted in the customer premises.
  • Signals from the AP entering at the WEM are converted and distributed through the CATV network.
  • the EID-WiFi is the interface between the upgraded WLAN CATV network and the WLAN unit (e.g., a laptop computer) at the customer premises.
  • FIG. 2 depicts a multi-story building with a WLAN over CATV system operating out of the CATV spectrum at frequencies: 1080 - 1155 MHz Uplink and 960 — 1035 MHz Downlink.
  • the WLAN Entrance Module (WEM) shown in FIG. 2 converts the original WLAN RF signal to the assigned frequency spectrum to be carried on the CATV network.
  • the WTM acts as a bypass module to enable transmission of the WLAN signals over the CATV networks without interference between both signals.
  • the WTM is a bypass unit that differentiates between the CATV signals and the WLAN down/ up- converted signals (1080 - 1155 MHz Uplink and 960 - 1035 MHz Downlink) at the input/output of each CATV amplifier in the network and combines the signals again at the output/input of each CATV amplifier to be carried on to the next amplifier stage.
  • the EID-WiFi converts the WLAN signals from the assigned frequencies at the CATV network (out of the standard CATV spectrum) back to their original signals, and differentiates between the CATV signals to be carried to the TV or Set Top Box and the WLAN signals to be transmitted in the customer premises.
  • Signals from the AP entering at the WEM are converted and distributed through the CATV network.
  • the WTM transports the WLAN signals through the CATV network.
  • the WTM may be installed at any active point of the CATV network, bypassing the trunk amplifiers, line extenders and distribution modules.
  • the EID-WiFi is the interface between the upgraded WLAN CATV network and the WLAN (end user) unit
  • FIG. 3 illustrates a multi-story building with a WLAN over CATV system operating out of the CATV spectrum at the frequency range of 1080 - 1155 MHz Uplink and 960 - 1035 MHz Downlink with multiple AP units.
  • WEM Multiple WLAN Entrance Modules
  • Each WEM is connected to an AP which converts the original WLAN RF signal to the assigned frequency spectrum to be carried on the CATV network.
  • WEM's can convert any AP original frequencies standard (802.1 lb, 802.1 lg or 802.1 la) to the assigned frequency spectrum.
  • the AP's WEM's can be from the same standard with the same original frequencies or different original frequencies to support high capacity throughput or from different standards to support all WLAN standards on the CATV network.
  • the WTM acts as a bypass module to enable transmission of simultaneously multiple WLAN signals over the CATV networks without interference between both signals.
  • the EID-WiFi converts the WLAN signals from the assigned frequencies at the CATV network (out of the standard CATV spectrum) back to their original signals, and differentiates between the CATV signals to be carried to the TV or Set Top Box and the WLAN signals to be transmitted in the customer premises. Signals from the AP entering at the WEM are converted and distributed through the CATV network.
  • the WTM transports the WLAN signals through the CATV network.
  • the WTM is installed at any active point of the CATV network, bypassing the trunk amplifiers, line extenders and distribution modules.
  • the EID-WiFi is the interface between the upgraded WLAN CATV network and the WLAN unit (e.g., a laptop computer) at the customer premises.
  • FIGs. 4 and 5 illustrate Downlink and Uplink switching configuration to support CSMA CA over CATV.
  • the WEM unit connected to the AP includes a single- pole, double-throw (SPDT) RF switch in the downlink path and a single-pole, single- throw (SPST) RF switch in the uplink path.
  • the EID-WiFi at the customer premises includes SPST switches in the up and downlink path.
  • downlink signals sent from the AP towards the customer premises are detected by the WEM, and the downlink SPDT closes the downlink path to enable transmission of the signal through the CATV network towards the subscriber premises.
  • the uplink switch is open to prevent oscillations.
  • the EID-WiFi's 1, 2, 3, 4, and 5 detect the downlink signal, close the downlink SPST, and open the uplink SPST to prevent oscillations.
  • End User Terminal No. 1 transmits uplink signals towards the
  • EID-WiFi No. 1 detects the uplink signals, closes the uplink switch, and opens the downlink. Uplink signals are distributed over the CATV network to the AP. At the same time, all the other EID-WiFi's switches are closed at the downlink path and open at the uplink path.
  • the uplink signal is detected and the uplink switch is closed, while changing the position of the downlink SPDT to loop the uplink signals back towards the CAIN network to distribute the looped back uplink signals to the other EID- WiFi's 2, 3, 4, and 5, which are connected to the downlink path.
  • This enables the carrier sense function in the End User WiFi terminals located at EID-WiFi's 2, 3, 4, and 5.
  • the WEM with its circuitry for looping the uplink signals back to the
  • CATN network may be thought of as a means for downstream of uplink signals for a carrier sensing function at the End User WiFi terminals.
  • FIG. 6 A more detailed view of an exemplary EID-WiFi is shown in Fig. 6.
  • FIG. 7 illustrates a WTM according to an exemplary embodiment of the invention.
  • the combined WLAN and CATV signals enter the WTM.
  • HP/LP high- pass / low-pass filter
  • the signals are combined again through the HP/LP to be carried through the network. That is, the combined WLAN and CATV signals enter at the entrance of the LP/HP diplexer.
  • the diplexers each differentiate between the CATV signals and the WLAN signals.
  • the CATV signals 5 - 750MHz (860MHz) are carried through the LP filter to the CATV amplifier.
  • the LP filter to be combined again with the WLA ⁇ signals.
  • the WLA ⁇ signals are carried to/from the HP output to the WLA ⁇ filter, and the WLA ⁇ filter differentiates between the up-link and down-link signals to be amplified by the amplifiers to balance the power budget along the pass.
  • FIG. 8 illustrates a WEM according to an exemplary embodiment of the invention.
  • the WEM is an interface between the WLAN Access Point (AP) and the CATV signals. Downlink WLAN signals from the AP are down-converted to the assigned CATV spectrum and Uplink WLAN signals are up-converted from the assigned CATV frequency spectrum to the original WLAN frequencies.
  • AP WLAN Access Point
  • the WEM down- converts, for example, the original 802.1 lb, or the 802.1 la signals received from the AP to intermediate WiFi frequencies to be carried on the CATV network and up-converts the intermediate WiFi frequencies carried on the CATV network to the original 802.1 lb or 802.1 la to be received by the AP.
  • the WEM depicted in FIG. 8 is a single band Up/Down Converter that converts the WLAN signals from their original signals i.e. 2.4 GHz (due to 802.1 lb) and or 5.3 GHz (due to 802.1 la) to any frequency bandwidth in the frequency band of 960 - 1035 MHz, 1080 - 1155 MHz and or 5 -45/65 MHz 500 - 750/860 MHz.
  • the WEM module converts TDD downlink signals to FDD downlink signals to be transmitted over the CATV network, and uplink FDD signals coming from the CATN network to uplink TDD signals to be transmitted to the AP.
  • FIG. 9 depicts a dual band WEM UDC according to an exemplary embodiment of the invention.
  • the dual band WEM enables the simultaneous carrying of both 802.1 lb and 802.1 la signals on the CATV network to, for example, the customer premises.
  • Each band is converted to a different portion of the spectrum in the CATV network.
  • 802.1 lb may be converted to a 20 MHz bandwidth uplink and a 20 MHz downlink within the frequency range of the CATV, (960 - 980 MHz, and 1080 - 1100 MHz).
  • 802.1 la may be converted to another 20 MHz bandwidth uplink and a 20 MHz downlink within the frequency range of the CATV, (1000 - 1020 MHz, and 1120 - 1140 MHz).
  • FIG. 10 illustrates a EID WiFi UDC according to an exemplary embodiment of the invention.
  • the EID WiFi down-converts the original 802.1 lb, or the 802.1 la signals received from the end user terminal to the assigned CATV network frequencies (960 - 1035 MHz for example), and up-converts the WiFi signals carried on the CATV network (1080 - 1155 MHz) to the original 802.1 lb or 802.1 la signals to be transmitted to the end user terminal.
  • the EID WiFi is working in switch mode, and the uplink and downlink switches are controlled by the local control logic, according to the sensing of uplink and downlink signals.
  • the EID-WiFi switched module UDC converts the FDD Downlink WLAN signals received from the CATV network in the frequency band of 960 - 1035 MHz and/or 500 - 750/860 MHz to TDD Downlink signals to be transmitted at the customer premises using the WiFi frequencies (2.4GHz and/or 5.3GHz) and converts back TDD uplink signals received from the customer premises in the WiFi frequency band (2.4GHz and/or 5.3GHz) to FDD uplink signals to be transmitted on the CATV network at the frequency band 1080 - 1155 MHz and/or 5 - 45/65 MHz towards the AP.
  • FIG. 11 shows a dual band EID-WiFi UDC.
  • the dual band EID WiFi unit enables the reception and transmission of both 802.1 lb and 802.1 la, simultaneously, on the CATV network and to the end user. This unit enables the use of both standards simultaneously on the network. For example, 802.1 lb may be converted to 20 MHz bandwidth uplink, and 20 MHz downlink within the frequency range of the CATV, (960
  • 802.1 la may be converted to another 20 MHz bandwidth uplink, and 20 MHz downlink within the frequency range of the CATV, (985
  • FIGs. 12 and 13 illustrate the original 802.11b, 802.11g and 802.11a frequencies. Note that 802.1 lb and 802.1 lg share the same frequency channels.
  • FIG. 14 illustrates a frequency chart of the original 802.1 lb, and 802.1 lg non- overlapping frequencies. These original, non-overlapping frequencies are shifted to downlink and uplink frequencies such that the WLAN WiFi signals can be carried on the
  • FIG. 15 illustrates a frequency chart of the original 802.1 lb, and 802.1 lg overlapping frequencies. These original overlapping frequencies are shifted as needed to downlink and uplink frequencies such that the WLAN WiFi signals can be carried on the
  • FIG. 16 illustrates a frequency chart of the original 802.1 la frequencies.
  • FIG. 17 illustrates one bandwidth allocation plan for 802.1 lb, and 802.1 lg non-overlapping channels (shifted frequency out of the CATV spectrum) at frequencies
  • FIG. 18 illustrates one bandwidth allocation plan for 802. lib
  • FIG. 19 illustrates one bandwidth allocation plan for 802.11 a channels
  • FIG. 20 illustrates one bandwidth allocation plan for 802. l ib
  • 802.1 lg and/or 802.11a channels working simultaneously (out of the CATV spectrum) at frequencies 1080 - 1155 MHz for Uplink and 960 - 1035 MHz for Downlink.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Small-Scale Networks (AREA)

Abstract

La présente invention a trait à un système de communication qui fournit un accès dans une portion analogique d'un système de réseau local sans fil, notamment dans sa section de propagation/rayonnement RF. Le réseau comporte un module d'entrée sans fil et un point d'accès sans fil en interface avec un réseau de télédistribution au niveau du module d'entrée sans fil. En outre un unité de réseau local sans fil Wi-Fi intérieure améliorée est connectée au réseau de télédistribution. Le module d'entrée sans fil comporte une porteuse aval apte à la détection de signaux de liaison montante et la retransmission des signaux de liaison montante en renvoi vers le parcours en aval. Ainsi, des signaux transmis selon le protocole de communications de terminal de réseau local sans fil traversent le réseau de télédistribution, sans modification, utilisant un réseau à accès multiple par détection de porteuse et évitement de collision.
PCT/US2005/002442 2004-01-26 2005-01-26 Services de reseau local sans fil sur reseau de teledistribution utilisant des services de reseau a acces multiple par detection de porteuse et evitement de collision WO2005072356A2 (fr)

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EP05712063A EP1709825A2 (fr) 2004-01-26 2005-01-26 Services de reseau local sans fil sur reseau de teledistribution utilisant des services de reseau a acces multiple par detection de porteuse et evitement de collision

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US53850804P 2004-01-26 2004-01-26
US60/538,508 2004-01-26

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Cited By (4)

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EP2060114A1 (fr) * 2006-09-12 2009-05-20 Thomson Licensing Appareil et procédé de transmission bidirectionnelle de signaux
WO2009149101A1 (fr) 2008-06-05 2009-12-10 Qualcomm Incorporated Antenne distribuée à distance
CN102752179A (zh) * 2012-07-06 2012-10-24 全军 射频信号与catv信号的混合分配装置及其方法
CN113841414A (zh) * 2019-03-19 2021-12-24 Ppc宽带股份有限公司 经由电缆传达无线信号的通信系统

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