WO2012028277A1 - Réseau local présentant une station de base et plusieurs stations de base de cellules radio reliées par des lignes optiques avec affectation configurable de canaux de données à des canaux radio - Google Patents

Réseau local présentant une station de base et plusieurs stations de base de cellules radio reliées par des lignes optiques avec affectation configurable de canaux de données à des canaux radio Download PDF

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Publication number
WO2012028277A1
WO2012028277A1 PCT/EP2011/004276 EP2011004276W WO2012028277A1 WO 2012028277 A1 WO2012028277 A1 WO 2012028277A1 EP 2011004276 W EP2011004276 W EP 2011004276W WO 2012028277 A1 WO2012028277 A1 WO 2012028277A1
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WO
WIPO (PCT)
Prior art keywords
radio
data
base station
channel
signals
Prior art date
Application number
PCT/EP2011/004276
Other languages
German (de)
English (en)
Inventor
Jörg SCHÖBEL
Original Assignee
Technische Universität Carolo-Wilhelmina Zu Braunschweig
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 Technische Universität Carolo-Wilhelmina Zu Braunschweig filed Critical Technische Universität Carolo-Wilhelmina Zu Braunschweig
Publication of WO2012028277A1 publication Critical patent/WO2012028277A1/fr

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Classifications

    • 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
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • H04B10/25752—Optical arrangements for wireless networks
    • H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
    • 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
    • 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

Definitions

  • the invention relates to a local area network with a base station and at least one radio cell base station.
  • Such networks can be used to network both mobile and fixed terminals, such as computers, cell phones, smart phones, and the like. This is not only interesting for networks in corporate buildings, but is increasingly used in private households.
  • the user requirements for the data rate are constantly increasing, especially with regard to the online usage or local provision of media, such as the high-resolution
  • CONFIRMATION COPY Watch TV The so-called “cloud” computing, in which the data of a user are stored in the data center of one or more providers, from where also computing capacity is made available, increases the demands on a transmitted data rate.The same applies to the ever-growing Number of downloads from the worldwide network that should be reached within a reasonable time.
  • wireless networks such as WLAN, or by wired networks, such as Ethernet.
  • wireless networks have the advantage of the wireless application, which is especially important for mobile devices such as mobile phones, smartphones or laptops.
  • the transferable data rates on these networks are relatively low.
  • Wired networks achieve significantly higher transmission rates, but are sometimes associated with considerable installation effort, as naturally cables must be laid.
  • Characteristic of the radio transmission in this frequency range is a very high radio field attenuation. Therefore, it is necessary to design the antenna system of the radio cell base station with a high gain, so that the radiation of the radio signals takes place only in a spatially narrow range. However, this requires a direct "visual connection" between the transmitter, that is to say the radio cell base station and the terminal, that is to say the receiver of the radio signals. If necessary, a reflection on a wall, ceiling or the like could also be used.
  • Fiber optic cables consist of a core guiding the signal and a surrounding cladding.
  • the coat causes a total reflection on the Boundary layer and thus a guide of the radiation in the core of the fiber optic cable.
  • this core reaches a certain radius, multiple light paths within the core are possible. There are therefore signal influences due to differences in transit time.
  • These so-called multimode fibers are therefore not suitable for high bandwidth communication.
  • a so-called single-mode fiber optic cable must be used in which the signal-carrying core has such a small diameter that the problematic multipath propagation or intermodal dispersion is eliminated.
  • the diameter of a core of a single-mode glass fiber typically has a diameter of 3 to 9 ⁇ . Because of this small extent, such a fiber optic cable in the purchase is quite expensive and can not be laid by laymen, as it requires special care and special connectors. The laying of a fiber optic cable is therefore also expensive and expensive.
  • the invention is therefore based on the object to propose a local area network, with the high data transmission rates are achievable and can be easily and inexpensively constructed and installed.
  • the invention solves this problem by means of a local area network having a base station and at least one radio cell base station which is connected to the base station via a data line having a plurality of data channels and adapted to receive and transmit data signals on the data channels of the data line and to transmit radio signals on a plurality of radio channels receive and transmit, wherein the at least one radio cell base station is adapted to both convert a data channel incoming data signals into radio signals and transmit on a data channel associated radio channel as well as on a radio channel incoming radio signals to convert data signals and on a radio channel associated data channel with the local network having electrical control through which to configure - -
  • the electrical control makes it possible to reconfigure the radio cell base station.
  • each data channel of the data line with which the at least one radio cell base station is connected to the base station can be assigned to one of the radio channels of the radio cell base station by a simple switching element or a switching matrix.
  • a flexible assignment of the data streams, which reached the at least one radio cell base on a data channel in the data line, to the terminals is possible. It is thus also possible, for example, to switch between a "downlink" in which high-rate radio signals are transmitted from the at least one radio cell base station to a terminal, and an "uplink" in which the at least one radio cell base station receives radio data of a terminal.
  • This also allows for faster data transport from a terminal via the at least one radio cell base station to the base station and further into a worldwide network, for example the Internet.
  • a network according to the invention it is possible with a network according to the invention to use one or more of the data channels of the data line for the signal transport in the direction of the downlink, ie from the base station to at least one radio cell base station, and at the same time one or more other data channels of the data line for to provide the signal transport in the direction of the uplink, ie from the at least one radio cell base station to the base station.
  • each radio channel would have to be permanently connected to a separate data channel, ie not switchable.
  • each data channel would be assigned a fixed radio channel, so that it would be decided via the selection of the data channel in the base station which device or which radio channel should be addressed. For this, however, the number of data channels must be increased until it corresponds to the number of possible radio channels. This significantly increases the cost of the data channels.
  • the local network is difficult to upgrade, for example, when added to terminals that require more radio channels. In this case, with a network according to the invention, the radio cell base station could be exchanged without having to exchange or extend the data lines.
  • the data line comprises an optical line for transmitting optical data signals.
  • This data line comprises in particular a glass fiber, so that the signal can be transported directly in the 60 GHz band.
  • the data line comprises at least one polymer fiber.
  • the signal can not be transported directly in the 60 GHz band here, it has to be transported because of the low bandwidth in the baseband or at a comparatively low intermediate frequency.
  • a polymer fiber is in comparison to the glass fiber but much cheaper and much easier to install and install.
  • the data line may also include at least one electrical line for transmitting electrical signals.
  • the data line may have a plurality of these lines, each of which defines one of the data channels. In this way, a particularly simple embodiment of the individual data channels is ensured.
  • the signal can be transported directly in the 60 GHz band or optionally on an intermediate frequency by the optical signal is modulated accordingly.
  • Multi-channel transmission can be achieved by wavelength division multiplexing.
  • the data line consists of polymer fibers with a wavelength division multiplex. Then each wavelength on the optical fiber corresponds to one channel. Usually, a separate transmitter, for example a laser or a light-emitting diode, and a separate receiver, for example a photodiode, are then present for each wavelength.
  • the optical signals are then merged for transmission on the fiber via a multiplexer, which includes, for example, optical filters, and separated again into wavelengths after transmission. If several optical fibers are used, each of which defines a data channel, this is not necessary, as here the signals of the different channels do not have to be combined and separated again after transport through the fiber.
  • Polymer fibers typically have a large dispersion, especially modal dispersion, because of the large core diameter. Therefore, the modulation method used should be chosen in particular such that it is suitable both for the transmission of the data over the data line as well as for the transmission on the radio channel. This can be achieved for example with an orthogonal frequency division multiplex (OFDM) modulation.
  • OFDM orthogonal frequency division multiplex
  • the same modulation as used for the radio signal usually an OFDM modulation, so that a signal conversion in terms of modulation and coding between the radio signal and optical signal is unnecessary.
  • the radio channels are at least defined by spatially limited beam lobes, which are in particular pivotable and / or switchable.
  • the antenna system of the at least one radio cell base station must be designed with a high gain due to the high radio field attenuation.
  • the radiation of the radio signals is limited to a relatively narrow spatial area, so-called beam lobes.
  • this requires a tracking of the beam lobes, both the transmitter and the receiver of the radio signals to ensure error-free transmission of the radio signals.
  • the beam lobes are formed by the antenna system and can be pivoted through different phases on the antenna elements.
  • the antenna system is constructed, for example, such that the input power is distributed to the antenna elements via a power distribution network.
  • each antenna element is provided with a phase shifter to make the phase individually adjustable for each antenna element.
  • different beam lobes are formed, which are formed by a continuous connection. Change the phase can also be continuously guided or panned.
  • the system may have switchable lobes.
  • the antenna system simultaneously forms several beam lobes.
  • a beam-shaping element is provided which has its own input for each beam lobe to be formed.
  • a pivoting of the beam lobe can be simulated by, for example, switches all beam lobe inputs of the beam-shaping element via a 1-on-N switch to a single input.
  • the assignment between electrical channel and trained beam lobe can be flexibly configured.
  • a dynamic and adaptive switching to an alternative beam pair of transmitter and receiver may be provided to ensure a continuously high transmission quality.
  • beamforming methods and elements may be used, such as phased array array antennas, Rotman lenses, dielectric lenses, or Butler matrices.
  • any other form of beam shaping methods and elements is conceivable.
  • the electrical control is set up to pivot at least one spatially limited beam lobe of at least one radio cell base station. This is done as part of the configuration or reconfiguration of the radio cell base station.
  • the local network has a plurality of radio base stations, so that terminals in several different rooms of a building can be networked with each other.
  • the communication between the at least one radio cell base station and the electrical control advantageously takes place via a wireless connection, in particular WLAN.
  • the logical, for example, routing, and electrical control can be arranged in particular in the base station.
  • the signaling of the reconfiguration state, from the electrical control to the radio cell base station, is effected via the separate signaling channel, that is to say in particular via the wireless connection, for example WLAN.
  • the logical routing in the form of interpretation of the data packets, the allocation of the data streams to the various channels of the data line and adaptive response to dynamic changes of the radio channels, for example by movement of terminals, takes place here alone in the base station.
  • the radio cell base station carries out the routing instructions of the base station or the electrical control by changing the signal connections between the data channels of the data line and the radio channels. You do not have to interpret the data packets themselves, so that the required capacities for data processing in the radio cell base stations themselves are very low. If necessary, frequency conversion of the data signal into the radio channel selected by the electrical control takes place in the radio cell base station. For example, to select a radio channel, the electrical controller may switch the local oscillator frequency of a mixer or connect the data signal to another mixer.
  • the electrical controller may switch the local oscillator frequency of a mixer or connect the data signal to another mixer.
  • the conversion of the data signals to a radio channel and in particular to one or more of the beam lobes takes place. This can be done, for example, by signal switching between the various inputs and feed structures of a beam-shaping element, for example a Rotman lens or dielectric lens, or by controlling phase shifters on one - -
  • the signaling channel via which the communication between the at least one radio cell base station and the electrical control takes place, can be designed, for example, as WLAN in the 2.4 or 5 GHz band or another
  • radio standard It is also possible to store a narrow-band data stream in the spectrum next to the high-rate data stream of the data channels. This can then be received and interpreted and processed with low data processing capacity in the at least one radio cell base station.
  • Fig. 1 - a schematic block diagram of a local area network
  • Fig. 2 is a schematic block diagram of a radio cell base station
  • Fig. 3 - a schematic block diagram of a terminal.
  • FIG. 1 shows a schematic block diagram of a local area network according to an exemplary embodiment of the present invention.
  • a base station 10 is coupled via a network connection 101 to a data network 102, which for example represents the Internet.
  • the network connection 101 has a very high data rate, which can be, for example, of the order of magnitude of 1 to 10 GBit per second and can be, for example, an FTTH connection ("fiber to the home").
  • the local network shown in FIG. 1 has two radio cell base stations 31, 32. These are connected to the base station 10 via a respective data line 201, 202.
  • the data lines 201, 202 together form the so-called "backbone" network 20.
  • the data lines 201, 202 are preferably in the form of polymer fibers, which are embodied, for example, with a step or gradient index and allow a realization of the channels by wavelength multiplexing. In this case, a separate wavelength, ie a color of the optical signal, is provided for each data channel in the data line 201, 202.
  • Each radio cell base station 31, 32 is arranged to be on different ones Radio channels to send via the data lines 201, 202 incoming data signals in the form of radio signals.
  • radio signals from the radio cell base stations 31, 32 can be received and sent in the form of data signals over the data lines 201, 202 to the base station 10.
  • each radio cell base station 31, 32 has three beam lobes 311, 321. The radio transmission of the radio signals to the terminals takes place via these. The use of spatially limited beam lobes increases the range of the radio signals.
  • 61, 62, 63 comprises a high-frequency device 41, 42, 43. Via these high-frequency devices 41, 42, 43, radio signals emitted by the radio cell base stations 31, 32 along their beam lobes 311, 321 can be received and provided via each high-frequency device 41, 42, 43 Beam lobes 411, 421, 431 are sent to the radio cell base stations 31, 32.
  • Each terminal 61, 62, 63 also has at least one further component 51, 52, 53, which may be, for example, computer, microprocessor, memory, screen or input devices.
  • Terminals can be, for example, mobile phones, smartphones, computers, laptops, but also dedicated signal receivers, for example for high-resolution video signals for display via a connected monitor.
  • the signaling of the configuration of the individual radio cell base stations by the electrical control takes place via a separate signal line 70, which, for example, also serves as a return channel from the terminals 61,
  • the base station 10 can be used. If the routing information is transmitted over a narrowband channel on the backbone network 20 from the data lines 20, 202 and the backbone network 20 only unidirectionally in the downlink, ie in Rieh- tion from the base station 10 to the radio cell base stations 31, 32, a connection of the radio cell base stations 31, 32 with the signal line 70 can be omitted. In this case, the connections 71, 72 are superfluous.
  • FIG. 2 shows a schematic view of a radio cell base station 30. It has a connection to the backbone network 20. The data arriving via this connection are split, for example, via a multiplexer into the individual channels and fed to a possibly optical-electrical converter 306. This converter is used in the reverse mode as a transmitter of the data signals to the base station 10.
  • the pending at the outputs of the transmitter or receiver 306 electrical signals 305 from the data channels are in one or more switching elements 304, which can be formed, for example, as a switching matrix, the assigned to individual radio channels 303. From the signals of the radio channels 303, a beam lobe 301 is generated by a beam-shaping element 302.
  • a data signal of a data channel along the data line of the backbone network 20 is generated from received radio signals of a radio channel.
  • the radio cell base station 30 is in contact with the electrical control of the base station 10. In this way, the configuration of the radio cell base station, ie the allocation between radio and data channels, is changed. The switching or reconfiguration of the electrical signal paths 305 or the radio channels
  • 303 can take place at different frequencies, for example in the baseband, at the intermediate frequency or the radio frequencies, so that the frequency conversion in one or more of the assemblies 302,
  • element 304 and 306 can be done.
  • element 304 may include a reconfigurable frequency conversion, for example, by switching local oscillator signals to mixers. Everybody is here Professional known technical concrete embodiment conceivable.
  • FIG. 3 schematically shows the structure of a terminal 60.
  • This consists of a high-frequency device 40, which can form a plurality of beam lobes 401 via a suitable antenna with beam-shaping element.
  • the terminal 60 is connected to the base station 10, via which, for example, the beam lobe 401 to be used is activated.
  • the signal line 70 can also be used as a low-rate return channel.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un réseau local présentant une station de base (10) et au moins une station de base de cellules radio (30, 31, 32), qui est reliée à la station de base (10) par le biais d'une ligne de données (201, 202) ayant plusieurs canaux de données et est conçue de manière à recevoir et émettre des signaux de données sur les canaux de données de la ligne de données (201, 202) et à recevoir et émettre des signaux radio sur plusieurs canaux radio. La ou les stations de base de cellules radio (30, 31, 32) sont configurées de manière à convertir des signaux de données arrivant sur un canal de données en des signaux radio et à émettre lesdits signaux sur un canal radio affecté à un canal de données, mais également de manière à convertir des signaux radio arrivant sur un canal radio en des signaux de données et à émettre lesdits signaux sur un canal de données affecté au canal radio. Le réseau local comporte une commande électrique qui permet de configurer quel canal de données est affecté à quel canal radio et quel canal radio est affecté à quel canal de données.
PCT/EP2011/004276 2010-09-02 2011-08-26 Réseau local présentant une station de base et plusieurs stations de base de cellules radio reliées par des lignes optiques avec affectation configurable de canaux de données à des canaux radio WO2012028277A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010044236 DE102010044236A1 (de) 2010-09-02 2010-09-02 Lokales Netzwerk
DE102010044236.4 2010-09-02

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WO2012028277A1 true WO2012028277A1 (fr) 2012-03-08

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WO (1) WO2012028277A1 (fr)

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Publication number Priority date Publication date Assignee Title
EP3111719B1 (fr) * 2014-02-25 2017-12-13 BAE Systems PLC Réseau et appareil de communication par fibre-radio
EP2911470A1 (fr) * 2014-02-25 2015-08-26 BAE Systems PLC Réseau, appareil et procédé de communication fibre-radio

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