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WO2003058850A2 - Dispositif et procede pour l'amelioration de la communication numerique sans fil de l'exterieur vers l'interieur - Google Patents

Dispositif et procede pour l'amelioration de la communication numerique sans fil de l'exterieur vers l'interieur Download PDF

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Publication number
WO2003058850A2
WO2003058850A2 PCT/BE2003/000002 BE0300002W WO03058850A2 WO 2003058850 A2 WO2003058850 A2 WO 2003058850A2 BE 0300002 W BE0300002 W BE 0300002W WO 03058850 A2 WO03058850 A2 WO 03058850A2
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WO
WIPO (PCT)
Prior art keywords
antenna
outdoor
indoor
unit
unit according
Prior art date
Application number
PCT/BE2003/000002
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English (en)
Other versions
WO2003058850A3 (fr
Inventor
Marc Engels
Jan Jozef Julia Maria Erreygers
Johan Joseph Gustaaf Haspeslagh
Frank Op't Eynde
Original Assignee
Loranet Nv
Interuniversitair Microelektronica Centrum Vzw
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 Loranet Nv, Interuniversitair Microelektronica Centrum Vzw filed Critical Loranet Nv
Priority to AU2003201218A priority Critical patent/AU2003201218A1/en
Publication of WO2003058850A2 publication Critical patent/WO2003058850A2/fr
Publication of WO2003058850A3 publication Critical patent/WO2003058850A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15507—Relay station based processing for cell extension or control of coverage area
    • H04B7/15514—Relay station based processing for cell extension or control of coverage area for shadowing compensation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/007—Details of, or arrangements associated with, antennas specially adapted for indoor communication

Definitions

  • the present invention is related to communications via a radio channel, in particular to a wireless radio telecommunications system, an indoor-outdoor coupling device for coupling between a telecommunications network, such as a wireless or cable network and an indoor wireless network, especially a LAN, and a method for providing improved communications between the inside and outside of a building.
  • a wireless radio telecommunications system in particular to a wireless radio telecommunications system, an indoor-outdoor coupling device for coupling between a telecommunications network, such as a wireless or cable network and an indoor wireless network, especially a LAN, and a method for providing improved communications between the inside and outside of a building.
  • R is the bitrate (number of transmitted information bits per second) capacity of the radio link (measured in “bits/sec")
  • BW is the bandwidth of the radio signal (measured in "Hz”).
  • R increases with the Received Signal Power, or, in other words, R decreases with the signal attenuation between transmitting and receiving antenna. Therefore the capacity of the radio link is negatively impacted by the distance between the transmitting and receiving antennas. This relationship between distance and capacity becomes worse when the radio signal has to pass through obstacles such as walls, tree leafs, rain drops, fog or snow, or when the direct line-of-sight between the two antennas is obstructed.
  • equation 2 yields a maximum signal attenuation, and hence a maximum distance between the two antennas.
  • a known solution to this problem is the insertion of a repeater in the radio link, as depicted in Fig. 3: the information is first transmitted from the transmitting antenna (1) to an auxiliary receiving antenna (4) associated with the repeater. In a second step, the repeater amplifies the received signal and re-transmits it from an auxiliary transmitting antenna (5) associated with the repeater, to the receiving antenna (2). The resulting capacity of the link is then given by expression 3:
  • Attenuation 1 and Attenuation 2 are the signal attenuations over the two radio links, respectively.
  • the goal of the repeater is to satisfy expression 3 for those cases where a direct communication from (1) to (2) would suffer from too large a signal attenuation.
  • a potential problem of the repeater is the fact that it generates a delayed and amplified version of the original signal. This signal might interfere with the original signal, causing fading and inter-symbol interference (ISI).
  • FIG. 4 An indoor-to-outdoor communication (or vice-versa), is depicted in Fig. 4.
  • the radio signal is impacted by the attenuation due to the distance (6) between the outdoor antenna and the outer wall of a building, by the attenuation due to the passage through the outer wall of the building (7), and by the attenuation due to the signal propagation inside the building (8).
  • US 5,604,789 and UWO 01/30003 both propose communicating between an outside antenna, e.g. of a base station or a repeater and an indoor antenna unit. However, these suffer from the wall antenuation of the signal thus requiring high power outdoor transmitters and/or arranging the repeater to be close to buildings.
  • an indoor to outdoor unit for placement adjacent to a structural part of the building such as a wall, comprising: first antenna means being for wireless communication with at least one indoor antenna placed inside said building, the first antenna means preferably having a reflector for reflecting radio signals towards the inside of the building.
  • the present invention also provides a wireless or radio signal indoor to outdoor unit wherein second antenna means is for communication with at least one outdoor antenna placed outside the building, and that the first antenna means is for communicating with the at least one indoor antenna placed inside said building.
  • the first and second antenna means are preferably contained in or attached to a housing which may be fixed to a wall of the building or otherwise attached close thereto.
  • the main communication between the first and second antenna means is preferably not by a wireless path.
  • the second antenna means may also be a directional antenna.
  • the direction to which the second antenna means transmits and receives radio signals may be determined by various means, e.g. by means for selection between n antenna elements, pointed to different directions, by moving an antenna or by beamforming.
  • the second antenna means may also be automatically pointed by means of a mechanical moving device (e.g. a motor).
  • the second antenna means may be substantially a flat antenna (e.g. a patch antenna) or a combination of substantially flat antenna elements.
  • the indoor-outdoor unit is preferably placed outside the building, near the outer wall, e.g. attached to an outer wall.
  • Different protocols may be used for the indoor and outdoor communications.
  • the indoor radio communication may be a Wireless LAN protocol.
  • the outdoor radio communication may use a Wireless MAN protocol or a BFWA protocol, for example.
  • the indoor and outdoor communication paths may be parts of different communications networks.
  • the indoor and outdoor communication paths are part of identical networks.
  • the present invention provides a method of communicating over an extended distance by transmitting signals in a multipath tolerant format to a repeater that amplifies the signal and re-transmits it in the same format.
  • the repeater preferably has a first and a second antenna, there being a cross- coupling path between the first and second antenna, whereby a gain of the amplification is such that the loop gain of the communication path formed by the first antenna, an amplifier and the second antenna and the cross-coupling path is lower than one.
  • the repeater may also comprise means for cancelling a signal received at the first or second antenna over a cross-coupling path from a signal transmitted from the second or first antenna, respectively, such that that a loop gain of the communication path formed by the first antenna, the means for cancelling, the amplifier and the second antenna and the cross-coupling path is lower than one.
  • a multipath tolerant format are OFDM or DMT signal with a cyclic prefix and a time modulated signal with a cyclic prefix. The use of a multipath tolerant format allows a repeater having a lower gain than would otherwise be required to reduce cross-coupling problems at the repeater.
  • a remote terminal receiving the original signal may consider this as noise compared to the received amplified signal from the repeater.
  • a higher level of amplification is required at the repeater to maintain a particular signal to noise ratio.
  • the remote terminal can combine both the original signal and the amplified signal and thus obtain a better received signal quality. Accordingly, the amplification at the repeater may be reduced to obtain a certain signal quality at the remote terminal. The reduction in amplification required, reduces the cost of the indoor-outdoor unit.
  • the indoor antenna may be included in a handheld mobile device, for example, although the present invention is not limited thereto, e.g. it may be a fixed indoor antenna, e.g. an access point or bridge of a wireless LAN.
  • an antenna is provided, aimed at establishing a wireless communication with devices placed inside a building, whereby the antenna is placed close to the outer wall on the outside of the building, in such a way that a part of this wall is situated in the near-field region of the antenna. Since the global effect of all three attenuations (6) to (8) has to satisfy equation 2, the isolated effect of attenuation (6) can be reduced by the location of the antenna with a maximum distance between the outdoor antenna and the outer wall being small.
  • This antenna is placed substantially parallel to the wall.
  • the antenna preferably has a reflector to reflect radio signals towards the inside of the building.
  • the indoor-outdoor unit is adapted to automatically switch to another outdoor antenna when communications with the first outdoor antenna are impaired.
  • Fig. 1 shows a radio communications channel in side view.
  • Fig. 2 shows a radio communications channel with obstruction in side view.
  • Fig. 3 shows a radio communications channel with repeater in side view.
  • Fig. 4 shows an indoor-outdoor radio communications channel in side view.
  • Fig. 5 shows an indoor-outdoor radio communications channel with an indoor-outdoor unit in accordance with one embodiment of the present invention in side view.
  • Figs. 6a to d show schematic top views further embodiments of an indoor-outdoor unit according to the present invention.
  • Fig. 7 shows a schematic top view of a further embodiment of the present invention comprising an antenna directed away from a building consisting of n (here: 6) directive elements.
  • Fig. 8 shows a schematic top view of a further embodiment of the present invention comprising an antenna directed towards the inside of a building having a beamwidth covering a half-sphere.
  • Fig. 9 shows schematic top and side views of a single unit housing for an indoor- outdoor unit in accordance with an embodiment of the present invention.
  • Fig. 10 shows a multipath tolerant modulation format for radio signals.
  • Fig. 11 shows an embodiment of an indoor-outdoor unit in accordance with an embodiment of the present invention.
  • Multi-path tolerant format refers to the use of a digital data stream with guard gaps.
  • a digital radio signal is sent through a dispersive channel the digital signals are spread/delayed such as to cause inter-symbol interference (ISI).
  • ISI inter-symbol interference
  • guard gaps Between digital data blocks the spread or delay of the signal is into the guard gap and less into neighbouring data blocks. Thus, ISI is reduced.
  • the disadvantage is that the data rate is lowered.
  • a preferred type of guard gap is a cyclic prefix, i.e. a copy of the end of a digital data block is added before the data block
  • G generally refers to the power gain which is the ratio of the radiation intensity of an antenna compared with that of an isotropic antenna. Manufacturers usually refer to a single value of G which is then the maximum value. The gain is the product of the directivity and the efficiency.
  • Directional antenna has antenna gain in the azimuth plane, i.e. there is one or more gain maxima in one or more directions in the azimuth plane.
  • the 3dB beam width in the azimuth plane is less than 180°.
  • Variable direction antenna is an antenna in which the direction of maximum gain can be changed during operation.
  • An adaptive antenna is a form of variable direction antenna.
  • the present invention relates to communication between indoor and outdoor environments, especially making use of wireless radio telecommunication networks.
  • the access method for the telecommunications networks is not considered a limitation on the present invention, e.g. whether CDMA, FDMA, TDMA, CDMA-FDMA, CDMA- FDMA-TDMA, FDMA-TDMA or whether spread spectrum techniques are used such as frequency hopping or direct sequence spread spectrum.
  • a first aspect of the present invention provides a solution for indoor coverage for a wireless radio communications network by placing an indoor to outdoor coupling unit (10, 12) outside a structural part of a building such as the outer wall of the building, as shown in Fig. 5.
  • an indoor to outdoor coupling unit (10, 12) outside a structural part of a building such as the outer wall of the building, as shown in Fig. 5.
  • To place the unit it is preferably portable, e.g. has a housing to which the antennas are attached or wherein they are included, as well as any electronics placed within the housing in a suitable sealed compartment required to control the environment inside the unit.
  • the portable unit may be brought to site as a kit of parts that are there assembled and installed at the appropriate location.
  • the unit may be battery powered or may have a suitable power connection, e.g. for connection to the mains or an optional solar cell battery charging system for keeping the batteries charged up.
  • the indoor-outdoor device is preferably in the form of a self-contained unit that does not require an opening in the wall of the building, i.e. does not have two parts: an indoor antenna and an outdoor antenna with a connection there between which must pass through the wall.
  • a first communication (11) is established between a first antenna means (12) associated with the indoor to outdoor unit and an indoor antenna means (13).
  • a second radio communication (6) is established between an outdoor antenna means (9) and a second antenna means (10) associated with the indoor to outdoor unit.
  • the radiation of the first antemia means (12) should reach as much as possible the inside of the building.
  • a fraction of the radiation will be transmitted through the wall, another fraction of the radiation will be absorbed by the material of the wall and the rest of the radiation will be reflected by the wall.
  • Literature data typically cite an attenuation of 10-15 dB for microwave radiation that passes through a wall. However, experiments have shown that only a small fraction of the radiation is actually absorbed by the material of the wall.
  • this problem can be overcome by adding a reflector to the first antenna means.
  • the radiation transmitted by the first antenna means either reaches the wall or the reflector.
  • the radiation that reaches the reflector will be reflected towards the wall.
  • Radiation that is reflected by the wall reaches the reflector and is reflected back towards the wall.
  • a fraction will be transmitted through the wall. After multiple reflections of the radiation between the reflector and the wall, a large fraction of the radiation will have been transmitted through the wall because the absorption of the radiation by the wall is limited.
  • the first antenna means (12) is a combination of an omnidirectional or directional antenna (15) with a reflector (16) that reflects the radiation from the antenna towards the house (see Fig. 6a, 6d as well as item 17 of Fig. 9).
  • the first antenna means (12) is an antenna having a 3dB bandwidth over less than a certain angle in the azimuth plane, e.g. of 180° (half-sphere) or less, radiating towards the inside the building (see Fig. 8) combined with a reflector.
  • this first antenna means (12) is a flat antenna (e.g. a patch antenna), placed parallel to the outer wall combined with a reflector.
  • the first antenna means are placed sufficiently close to the outside wall of the building. If the first antenna means are too far away from the wall, radiation reflected by the wall may escape between the wall and the reflector. This would reduce the fraction of the radiation that reaches the inside of the building.
  • the distance between the first antenna means and the wall is less than a few wavelengths of the radiation such that the wall is in the near field region of the first antenna means. For example, the distance may be less than five wavelengths.
  • the first antenna means (12) improves the coverage of a wireless network in a building over different floors. It is known e.g. for wireless LAN systems that when the access point is installed in a building, the coverage is generally limited to the floor on which the access point is installed.
  • the materials between different floors often consist of reinforced concrete such that the reinforcement of the concrete acts as an efficient reflector of electromagnetic radiation.
  • the first antenna means When the first antenna means is installed outside the building, close to the outer wall, the radiation that enters the wall is also internally reflected in the wall. In this way the radiation effectively travels inside the wall. At each reflection a fraction of the radiation also leaves the wall. The wall acts in this way as a spreader of the radiation. This spreading effect is even more pronounced when the outside wall is a cavity wall because the fraction of the radiation absorbed in the cavity is very low. Therefore in a particular embodiment, the indoor-outdoor unit does not contain the second antenna means and the sole purpose of the unit is to act as a relay for wireless communications between different floors of a building.
  • the second antenna means (10) of the indoor to outdoor coupling unit can be a) an omnidirectional antenna (10, Fig. 6a), b) a directive antenna (10) having a 3dB bandwidth over a limited angle in the azimuth plane, e.g. a half-sphere, and directed towards the outside of the building (Fig. 6b), or c) a directional antenna (10) having a 3dB bandwidth angle less than 180°, e.g. 60° or 90°, pointed to the outdoor antenna (Fig. 6c).
  • a omnidirectional antenna 10, Fig. 6a
  • a directive antenna 10 having a 3dB bandwidth over a limited angle in the azimuth plane, e.g. a half-sphere, and directed towards the outside of the building
  • a higher signal attenuation can be accommodated and the length of the transmission
  • the second antenna means may be replaced by connection (30) to a cable network such as an optical fibre cable, a coax cable, a twisted pair cable or similar (Fig. 6d).
  • the second antenna means (10) consists of n directional antenna elements with fixed positions, each pointed to a different direction. This is shown in Fig. 7. With a selection device, the antenna element yielding the best performance can be selected.
  • the second antenna means is pointed by electronic means such as e.g. beamforming.
  • the second antenna means (10) is comprised of a moveable antenna, that is being pointed automatically toward the outdoor antenna (9) by means of a mechanical moving device, such as a motor.
  • the n sectors covered by the n antenna elements should be sufficiently overlapping in order to be optimized for the reception of signals that contain a significant portion of multipath radiation components.
  • the second antenna means should have preferably a beam width of at least 30 degrees with the main lobe of the antenna pattern oriented towards the transmitting antenna (9). Therefore the 3 dB beamwidth of the directional antenna element should preferably extend at least 15 degrees further than the maximum pointing error.
  • the overlap of the 3 dB beamwidth coverage angles of two directional antenna elements that cover adjacent angles has to be at least 30 degrees.
  • An advantage is that the indoor-outdoor unit can be installed by the customer without having to pay a lot of attention to the exact orientation of the antennas.
  • the indoor- outdoor unit has to be installed against a wall from which it has a 180 degree "viewing" angle.
  • the transmitting station has to be within the 180 degree angle.
  • the first second means (10), or its n elements are flat antennas (e.g. patch antennas). Alternatively, it can be a beamformer.
  • the second antenna means consists of n directional patch antennas.
  • a patch antenna is an at least two layered structure with a ground plane and a particularly shaped patch.
  • the ground plane 17(Fig. 9) of the n directional patch antenna elements serves as the reflector part of the first antenna means.
  • the customer premise equipment e.g. an indoor-outdoor unit
  • the unit is preferably not complex and preferably should not have different elements which require careful assembly. Therefore, another aspect of the present invention is the integration of the first antenna means and the second antenna means into one single housing (Fig. 9).
  • the indoor- outdoor communication device becomes one physical unit (14) that is easy to install by the customer at the customer's premises.
  • the indoor-outdoor coupling unit can be used for coupling an indoor network with a different outdoor network or for overcoming the transmission impairments introduced by walls in networks where equipment inside buildings belongs to the same network as outdoor equipment.
  • the indoor and outdoor communication channels (6, 11) are part of different networks or use different protocols or are otherwise so arranged that they are not mutually interfering.
  • the indoor to outdoor unit then translates, for example, the indoor communication protocol to the outdoor communication protocol and vice versa.
  • the indoor communication channel (11) is part of a Wireless Local Area Network (WLAN), or uses a WLAN protocol such as e.g. IEEE 802.11a, IEEE 802.11b, IEEE 802.1 lg, HIPERLAN1 or HIPERLAN2.
  • the outdoor communication channel (6) is part of a Wireless Metropolitan Area Network (WMAN), a Wireless Wide Area Network (WWAN) or a Broadband Fixed Wireless Access (BFWA) network, or uses a WMAN, WWAN or BFWA protocol such as IEEE 802.16, IEEE 802.16a, HIPERACCESS or HIPERMAN.
  • WMAN Wireless Metropolitan Area Network
  • WWAN Wireless Wide Area Network
  • BFWA Broadband Fixed Wireless Access
  • the indoor and outdoor communication channels (6, 11) are part of the same network (e.g. WLAN, WMAN, WWAN or BFWA) or use the same protocol.
  • the indoor to outdoor unit then acts as a repeater that amplifies the received signal and re-transmits it.
  • the amplification can be combined with a frequency shift and/or a demodulation and re- modulation operation.
  • An example of such a unit is shown schematically in Fig. 11, in which the second antenna means 10 is connected to a first radio unit 1. Details of filters and other radio components are not shown.
  • the first antenna means 12 is connected to a second radio unit 2.
  • a processing unit 22 is provided to carry out processing on the signal, e.g. to change format, protocol or similar.
  • Another aspect of the invention solves fading and inter-symbol inference caused by the indoor-outdoor unit operating as a repeater that preferably provides only pure amplification of the signal. It does so by combining the repeater with a multipath tolerant modulation format (see Fig. 10).
  • a modulation format consists, for example, of blocks of data for which the last L values (14) are identical to the first L values (13).
  • multipath tolerant modulation formats exist.
  • the receiving device will receive the original signal, transmitted e.g. by a base station as interference.
  • such a repeater has to provide sufficient gain such that the amplified signal is strong enough compared to the original signal in order to have a sufficient signal-to-interference-and-noise ratio at the receiving device.
  • a high gain may cause stability problems because of cross-coupling between the transmitting and receiving antenna of the repeater.
  • the receiving device When a multipath tolerant modulation format is used, the receiving device will treat the original signal as multipath components of the amplified signal.
  • the use of the mulitpath tolerant modulation format provides at least two advantages. Firstly, the repeater is not required to have a high gain because the original signal is not received as noise. This makes even repeaters with gains of 5, 10 or 15 dB useful. Secondly, the energy of the radiation of the original signal is still useful for the receiving device.
  • a particular embodiment of a multipath tolerant modulation format is an OFDM or a DMT signal with cyclic prefix.
  • OFDM systems are described in "OFDM for Wireless Multimedia Communications", by R. van Nee and R. Prasad, Artech House 2000, and in “Wireless OFDM Systems", by M. Engels [Ed.], Kluwer Academic Publishers, 2002.
  • a block of data inputs is modulated and distributed over various carriers in the frequency domain.
  • the frequency domain signal is transformed by a block of samples in the time domain.
  • the last L samples of this time domain block are copied and prepended to the time domain block.
  • Another embodiment of a multipath tolerant modulation format is a time domain signal with cyclic prefix.
  • a block of data is first modulated in the time domain, Next, the last L samples of this time domain block are copied and prepended to the block
  • the indoor-outdoor unit When the indoor-outdoor unit has been installed, it generally sets up a connection with the outdoor network, preferably automatically. At that moment the exact direction of the transmitting station is not yet known.
  • the indoor-outdoor unit will perform signal detection on the different antenna elements of second antenna means 10 and usually in a variety of different frequency bands. Typically, a complete scan will be performed over the complete range of antenna elements and frequency bands or over a sub-set of these.
  • the indoor-outdoor unit will store the information obtained during the scan. The selection can be embodied by an appropriate algorithm like but not limited to the selection on the base of maximal received power. After the complete scan, the indoor-outdoor unit will first try to set up a connection using the antenna element and frequency band where the best signal has been detected. If this would not be successful, it will try to comiect to the second strongest signal, and so on.
  • multiple antenna techniques with antenna means (10) may result in a communication with antenna's at multiple outdoor nodes located at different locations. This feature is particularly useful for providing redundancy in the outdoor connection.
  • Multiple antemia techniques include beamforming, spatial division multiple access (SDMA), multiple input multiple output (MIMO) systems.
  • the indoor-outdoor unit can restart its initialization procedure and perform again a complete scanning of the frequency bands and the antenna elements.
  • the indoor-outdoor unit can look up in a database, e.g. located in a memory to which it has access, in which frequency band and on which antenna element the second strongest signal was received during the previous initialisation. Then it attempts to establish connection with this transceiver without reinitialisation. If it does not succeed, it tries with the third strongest signal found in the previous initialisation, and so on. If no connection can be made, a complete initialisation procedure with complete scanning is started again.
  • Such an indoor-outdoor unit could, for instance, be used for transmitting digital data information between an outdoor antenna (e.g. a base station or an outdoor cell extending repeater) and one or more in-door computers.
  • the indoor- outdoor coupling unit could be used for transmitting digital voice information between an outdoor antenna (e.g. a base station or an outdoor cell extending repeater) and an in-door telephony device or telephony network.
  • the indoor-outdoor coupling unit could be used to communicate other forms of speech information, e.g. VOIP, or video information, such as e.g. Video-on-Demand or to provide connection to the Internet.
  • the present invention has been described for applications where an indoor wireless network is coupled to an outdoor wireless network. It will be clear to those skilled in the art that the invention is not limited thereto.
  • the invention also applies to the coupling of indoor networks to a variety of outdoor networks. In such coupling devices the second antenna means are replaced by appropriate termination means for other networks. These means can be e.g.:
  • xDSL stands for any of the DSL technologies such as ADSL, SDSL, SHDSL, VDSL
  • a cable network such as broadband cable network, e.g. a CATV network such as a cablemodem for DOCSIS or EURODOCSIS protocols.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

L'invention concerne une unité de communication intérieur-extérieur à placer à l'extérieur d'un bâtiment et en position adjacente à une partie structurelle du bâtiment. Ladite unité comprend un premier moyen antenne (12) assurant la communication avec au moins une antenne intérieure (13) placée à l'intérieur dudit bâtiment, le premier moyen antenne possédant un réflecteur conçu pour réfléchir les signaux radioélectriques en direction de l'intérieur du bâtiment. Par exemple, le premier moyen antenne peut être conçu pour être situé par rapport à une paroi du bâtiment, de sorte qu'une partie de la paroi se trouve dans la région de rayonnement proche du premier moyen antenne. Le premier moyen antenne peut être conçu pour être connecté à un réseau câblé. Autrement, ladite unité peut également posséder un second moyen antenne (10) permettant la communication avec au moins une antenne extérieure (9) située à l'extérieur du bâtiment. Les premier et second moyens antennes sont conçus pour être fixés à un boîtier ou pour être placés dans ce dernier. En fonctionnement, certains signaux reçus par le second moyen antenne (10) en provenance de l'antenne extérieure (9) sont transmis au premier moyen antenne (12) et certains signaux transmis par le second moyen antenne (10) à l'antenne extérieure (9) sont reçus du premier moyen antenne (12), de sorte que l'unité fasse office de répéteur.
PCT/BE2003/000002 2002-01-07 2003-01-06 Dispositif et procede pour l'amelioration de la communication numerique sans fil de l'exterieur vers l'interieur WO2003058850A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003201218A AU2003201218A1 (en) 2002-01-07 2003-01-06 Device and method for improving wireless outdoor-to-indoor digital communication

Applications Claiming Priority (2)

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GB0200238.4 2002-01-07
GB0200238A GB0200238D0 (en) 2002-01-07 2002-01-07 Device for improving wireless outdoor-to-indoor digital communication

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WO2003058850A2 true WO2003058850A2 (fr) 2003-07-17
WO2003058850A3 WO2003058850A3 (fr) 2004-05-06

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EP1919101A3 (fr) * 2006-11-02 2009-08-19 LG Telecom, Ltd. Répétiteur à fréquence radio de petite taille
EP2015471A1 (fr) 2007-06-18 2009-01-14 Alcatel Lucent Matériel de bâtiment adapté à la répétition de signaux RF, et équipement de bâtiment correspondant
US10075779B2 (en) 2012-04-20 2018-09-11 Commscope Technologies Llc Wireless drop in a fiber-to-the-home network
US10560766B2 (en) 2012-04-20 2020-02-11 CommScope Connectivity Belgium BVBA Wireless drop in a fiber-to-the-home network
LT6255B (lt) 2014-05-06 2016-03-10 Vilniaus Universitetas Elektromagnetinių bangų tiekimo į uždarą erdvę sistema ir būdas
US10018799B2 (en) 2016-12-07 2018-07-10 Google Llc Optical bridge between exterior and interior networks
US9871564B1 (en) 2016-12-08 2018-01-16 Google Llc Non-invasive beam steering

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AU2003201218A8 (en) 2003-07-24
GB0200238D0 (en) 2002-02-20
WO2003058850A3 (fr) 2004-05-06

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