EP3714556A1 - Système de communication, station de base maître, station de base relais et unité d'interface câblée pour un réseau radio numérique - Google Patents

Système de communication, station de base maître, station de base relais et unité d'interface câblée pour un réseau radio numérique

Info

Publication number
EP3714556A1
EP3714556A1 EP18807312.6A EP18807312A EP3714556A1 EP 3714556 A1 EP3714556 A1 EP 3714556A1 EP 18807312 A EP18807312 A EP 18807312A EP 3714556 A1 EP3714556 A1 EP 3714556A1
Authority
EP
European Patent Office
Prior art keywords
base station
radio
line
signal
uplink
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP18807312.6A
Other languages
German (de)
English (en)
Inventor
Klaus Dirksmeier
Jörn von Häfen
Amina Ayadi-Miessen
Julian Heitmeyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hytera Mobilfunk GmbH
Original Assignee
Hytera Mobilfunk GmbH
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 Hytera Mobilfunk GmbH filed Critical Hytera Mobilfunk GmbH
Publication of EP3714556A1 publication Critical patent/EP3714556A1/fr
Pending legal-status Critical Current

Links

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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels

Definitions

  • the invention relates to a communication system for a digital radio network, the at least one master base station and at least one relay base station arranged locally remote from the master base station having.
  • the invention also relates to a master base station and a relay base station for a digital radio network.
  • the invention further relates to a line interface unit for a digital radio network.
  • radio networks in particular in digital radio networks, there is the fundamental problem that the radio range is subject to physical limits on the one hand and on the other hand is not exactly predictable.
  • This concerns in particular the communication between a base station and a subscriber station of the digital radio network, both in the transmission in the downlink, i. in the transmission from the base station to the subscriber station, as well as in the transmission in the uplink, i. in the transmission from the subscriber station to the base station.
  • the radio range which is also referred to as the communication range, indicates the distance between transmitter and receiver within which successful radio communication between transmitter and receiver is possible.
  • the local area within which successful communication between a base station of a radio network and a subscriber station of the radio network is possible is referred to as coverage area of the base station.
  • the limited radio range and its lack of predictability are caused by various radio propagation effects that the radio signal propagating from the transmitter to the receiver is exposed to. In particular, shadowing involves obstructions in the line of sight between the transmitter and the receiver, which cause a considerable increase in the path loss of the radio signal compared to the communication in the presence of a line-of-sight communication.
  • radio range and the size of the coverage area of the base station of digital radio networks can be shading caused, for example, by buildings and building walls or mountains and hills.
  • Further radio propagation effects which are causative in this connection are, for example, reflections and scattering of the radio signal on the way from the transmitter to the receiver.
  • the coverage area of a base station which is referred to in this context as a master base station, by an additional radio network device located locally remote from the master base station, z.
  • an additional radio network device located locally remote from the master base station, z.
  • This possibility may, for example, be used, in particular, to expand the supply area in the vicinity of buildings or tunnels or in their interior.
  • the communication path in this case runs from the master base station via the additional radio network device to the subscriber station.
  • the uplink i. in the transmission from the subscriber station to the base station, the communication path from the subscriber station via the additional radio network device to the master base station.
  • the communication between the master base station and the additional radio network device is usually carried out by cable, i. E. via a transmission line.
  • the communication between the additional radio network device and the subscriber station takes place by radio, i. via the air interface.
  • Such repeaters are for a variety of radio standards, eg for second generation (2G), third generation (3G) and fourth generation (4G), LTE, PMR / LMR, DVB-H, TETRA, IEEE 802.11 WLAN, and IEEE 802.16 WiMAX mobile networks known and available as commercial products ,
  • Such repeaters have a high-frequency interface (RF interface) via which radio-frequency radio signals (RF radio signals) of the carrier frequency and bandwidth characteristic of the respective radio standard can be transmitted and received.
  • RF radio signals radio-frequency radio signals
  • the repeaters on a high-frequency amplifier (RF amplifier), which serves to amplify the RF radio signals.
  • radio signals can be amplified both in the downlink, which are transmitted from the base station to the subscriber station, and in the uplink radio signals are amplified, which are transmitted from the subscriber station to the base station.
  • the master base station in the downlink, the master base station generates the radio signal in the form of an analogue high-frequency signal (RF radio signal) from a bit sequence to be transmitted to the subscriber station by means of a radio signal coding process comprising a modulation.
  • This RF radio signal is transmitted from the master base station via a transmission line which connects the master base station to the repeater, e.g. via a coaxial cable to the repeater.
  • the repeater receives the RF radio signal over the transmission line, amplifies it and transmits it over the radio channel, i. via the Beerismestel le, to one or more subscriber stations of the radio network.
  • the repeater receives an RF radio signal transmitted by a subscriber station of the radio network via the air interface, amplifies this received signal and transmits the amplified RF radio signal via the transmission line to the master base station.
  • the master base station generates, by a radio signal decoding process comprising demodulation, from the RF radio signal received via the transmission line the bit string transmitted by the subscriber station.
  • the functionality of a repeater is restricted both in the downlink and in the uplink to the mere amplification of the RF radio signal, ie to the amplification of the analog high-frequency signal (RF signal).
  • RF signal analog high-frequency signal
  • a major disadvantage of these solutions is that the amplification of the RF radio signal by the repeater in both the downlink and the uplink leads to a deterioration of the signal quality caused by the analog stages of the RF amplifier.
  • a linearization of the amplifier in the repeater is not possible because this would require the baseband signal.
  • the baseband signal is not available in the repeater in the prior art systems with repeaters that only receive and amplify the RF radio signal.
  • ACP Adjacent Channel Power
  • ACI adjacent channel interference
  • the transmission line must be broadband, ie have a high cutoff frequency, in order to enable an error-free transmission of the high frequencies of the RF radio signals, which can range from several 100 MHz to several GHz.
  • Broadband cables eg fiber optic cables or coaxial cables, are therefore generally used as transmission lines.
  • such wideband transmission lines are in scenarios where there is an extension of the service area of base stations is required, eg in buildings or tunnels, often not available. They must therefore be installed in order to enable the connection of the repeater to the master base station, which results in high costs.
  • a system for TETRA radio networks with a central control device and at least two radio cell devices, which are connected to the control device via a transmission line in the form of a wired communication connection known.
  • the control device assumes the function of a master base station and the radio cell devices basically assume the function of repeaters.
  • the radio frequency radio signals which are referred to as TETRA-FIF signals
  • IF signals intermediate frequency signals
  • IF communication signals are downmixed.
  • the IF signal After transmission via the transmission line, the IF signal is up-converted to an FHR signal, i. there is a conversion from the IF frequency band of the IF signal back into the FIF frequency band of the FIF radio signal.
  • the communication system has at least one master base station and at least one relay base station located at a distance from the master base station.
  • the master base station is configured for wired communication with the at least one remotely located relay base station via a transmission line
  • the relay base station is configured for wired communication with the master base station via the transmission line.
  • the master base station has a processing unit and a first line interface unit connected to the processing unit.
  • the first line interface unit is connectable to the transmission line and adapted for wired communication with the relay base station.
  • the processing unit of the master base station is set up to transfer a downlink bit sequence, which is intended for transmission to at least one subscriber station via a radio channel, to the first line interface unit.
  • the processing unit is also configured to take over a first uplink bit string transmitted by at least one subscriber station from the first line interface unit.
  • a subscriber station is understood to mean a subscriber station of the digital radio network.
  • the downlink bit sequence contains specific data bits for transmission to at least one subscriber station.
  • the uplink bit sequence contains data bits transmitted by at least one subscriber station.
  • the downlink bit sequence can in particular be transmitted to at least one user station to be transmitted payload and / or Control data and / or signaling data comprise or consist entirely of such data.
  • the uplink bit sequence may in particular comprise user data (payload) transmitted by at least one subscriber station and / or control data and / or signaling data or consist entirely of such data.
  • control data and / or signaling data can be, for example, status data and / or configuration data.
  • interface control information can also be exchanged via the transmission line between the master base station and the relay base station, in particular between the processing unit of the master base station and the radio communication unit of the relay base station.
  • the downlink bit sequence includes digital data before modulation, i. digital data, as present in the protocol stack of a base station of a digital radio network in the downlink, before the base station generates by modulation a radio signal in the baseband or in the FIF frequency band.
  • the digital data of the downlink bit sequence can in particular be digital data, as present in the protocol stack of a base station of a digital radio network prior to transfer to a bit transmission layer (PHY) of a radio interface of the base station in the downlink.
  • PHY bit transmission layer
  • the digital data of the downlink bit sequence may in particular be digital data, as present in the protocol stack of a base station of a digital radio network in the downlink before being processed by a baseband processing part of a radio interface of the base station.
  • the downlink bit sequence may in particular have a modulation bit sequence, i. a sequence of modulation bits.
  • Modulation bits are bits which are supplied as input data to the modulation process carried out by a radio interface and from which the modulated radio signal to be radiated via an antenna is generated.
  • Modulation bits are also bits which originate as output data from a demodulation process carried out by a radio interface, which demodulation generates the modulation bits from a modulated radio signal received via an antenna.
  • the uplink bit sequence here comprises digital data after demodulation, ie digital data, as present in the protocol stack of a base station of a digital radio network in the uplink, after a radio interface of the base station detects the data bits by demodulation from a received radio signal.
  • the digital data of the uplink bit sequence can be, in particular, digital data, as present in the protocol stack of a base station of a digital radio network in the uplink after transfer from a physical layer (PHY) of a radio interface of the base station to an overlying layer.
  • PHY physical layer
  • the digital data of the uplink bit sequence may in particular be digital data as present in the protocol stack of a base station of a digital radio network in the uplink after being processed by the baseband processing part of a radio interface of the base station.
  • a modulation is understood to mean the term modulation in the broader sense, i.
  • a modulation is also understood as a modulation in baseband (baseband modulation).
  • a modulation in the baseband is understood to mean the generation of the complex envelopes, in particular the generation of the quadrature components (I component and Q component).
  • modulation in the sense of the present application may also involve up-converting the quadrature components, i. upmixing the quadrature components into a higher frequency band. The same applies (mutatis mutandis) for the term demodulation used in the present application.
  • the processing unit can have an implementation of the higher layers of the protocol stack of a base station of the digital radio network.
  • the processing unit may in particular be an implementation of
  • Layer 3 network layer and the overlying layers of the protocol stack or an implementation of the layer 2 (data link layer) and the overlying layers of the protocol stack.
  • the first line interface unit of the master base station is connectable to the transmission line and adapted to take over the downlink bit sequence from the processing unit.
  • the first line interface unit is further configured to perform a first line signal encoding process that generates a downlink line signal from the downlink bit sequence.
  • the first line signal In this case, the coding process may in particular be designed such that the downlink line signal is generated directly from the downlink bit sequence.
  • the downlink line signal is a signal suitable for conducted transmission.
  • the first line interface unit is further configured to transmit the downlink line signal to the relay base station via the transmission line connected to the first line interface unit.
  • the first line interface unit is further configured to receive an uplink line signal transmitted from the relay base station via the transmission line connected to the first line interface unit.
  • the first line interface unit is further configured to execute a first line signal decoding process which generates the first uplink bit sequence from the received uplink line signal.
  • the first line signal decoding process can in particular be configured such that the first uplink bit sequence is generated directly from the received uplink line signal.
  • the first line interface unit is also configured to pass the first uplink bit string to the processing unit.
  • the downlink line signal and / or the uplink line signal may include control information and / or signaling information, e.g. Status information and / or configuration information included.
  • the at least one relay base station of the communication system is set up to communicate with the at least one master base station located remotely from the relay base station via the transmission line.
  • the at least one relay base station has a second line-bound interface unit, which can be connected to the transmission line, for line-based communication with the master base station.
  • the at least one relay base station has a radio communication unit configured for radio communication with the at least one subscriber station of the digital radio network.
  • the radio communication unit of the relay base station is adapted to carry out a first radio signal decoding process, which from a via the radio channel, ie via the air interface, received uplink radio signal, the first uplink bit sequence, which was transmitted by at least one subscriber station , generated.
  • the radio communication unit of the relay base station is also configured to pass the first uplink bit sequence to the second line interface unit.
  • the radio communication unit of the relay base station is further adapted to the downlink bit sequence, which for transmission to at least one subscriber station of the digital radio network via a radio channel, i. via an air interface, it is intended to take over from the second line interface unit and to carry out a first radio signal coding process which generates a first downlink radio signal from the downlink bit sequence.
  • the radio communication unit of the relay base station is further configured to transmit the first downlink radio signal over the radio channel, i. via an air interface.
  • the second line interface unit of the relay base station is connectable to the transmission line and configured to take the first uplink bit string from the radio communication unit of the relay base station.
  • the second line interface unit is further configured to execute a second line signal encoding operation that generates the uplink line signal from the first uplink bit string.
  • the second line signal coding process can in particular be configured such that the uplink line signal is generated directly from the first uplink bit sequence.
  • the uplink line signal is a signal suitable for conducted transmission.
  • the second line interface unit is further configured to transmit the uplink line signal to the master base station via the transmission line connected to the second line interface unit.
  • the second line interface unit is arranged to receive the downlink line signal transmitted via the transmission line and to execute a second line signal decoding process which generates the downlink bit sequence from the received downlink line signal.
  • the second line signal decoding process can in particular be designed such that the downlink bit sequence is generated directly from the received downlink line signal.
  • the second line interface unit is also adapted to pass the downlink bit sequence to the radio communication unit.
  • the first and / or the second line signal coding process may in particular comprise a line coding and / or a modulation or the first and / or the second line signal coding process may consist of a line coding and / or a modulation.
  • the first and / or the second line signal encoding operation need not necessarily be a modulation of a carrier having a certain carrier frequency, i. upmixing from the baseband to a higher carrier frequency band.
  • the first and / or second line signal encoding operation may include such modulation of a carrier or may not include such modulation of a carrier.
  • the first and / or the second line signal coding process may in particular be a line coding, i. H. consist of a line coding.
  • the downlink signal in this case is a baseband signal.
  • the wireline transmission over the transmission line in this case is a baseband transmission.
  • the first line signal coding process and / or the second line signal coding process can in particular directly generate the downlink line signal or the uplink line signal from the downlink bit sequence or the uplink bit sequence.
  • Under an immediate generation of a line signal from a bit sequence is in particular, it is understood that in order to generate the line signal, a radio signal intended for transmission via the radio channel or a precursor thereof, eg a baseband radio signal to be modulated for transmission via the radio channel, is not generated , and / or that for generating the line signal is not a sampling of such a radio signal or such a precursor thereof.
  • the first and / or the second line signal encoding operation may be a one-step encoding operation, i. in particular a coding process in which a first signal is not first generated and then a bit sequence is generated by sampling from the first signal and subsequently, for example, by modulation and / or by line coding, a second signal is generated from the bit sequence.
  • the first and / or the second line signal coding process may in particular be a coding process which does not include sampling and / or analog-to-digital conversion.
  • the first and / or the second line signal coding process may be a coding process in which only one digital-to-analog conversion takes place.
  • mutatis mutandis for the first and / or the second line signal decoding process.
  • the first and / or the second line signal decoding operation can directly generate the uplink bit sequence or the downlink bit sequence from the uplink line signal or the downlink line signal.
  • a direct generation of a bit sequence from a line signal is understood to mean, in particular, that a radio signal transmitted via a radio channel or a pre-stage thereof, for example, does not first generate a bit sequence.
  • B. a carrier for transmission over the radio channel modulated baseband radio signal is generated from the line signal, and / or that is not for generating such a radio signal or such a precursor thereof, a digital-to-analog conversion takes place.
  • the first and / or the second line signal decoding process may in particular be a single-stage decoding process, ie in particular a decoding process a first bit sequence is not first generated from the line signal, for example by demodulation and / or line decoding, and then a signal is generated by digital-to-analog conversion from the first bit sequence, and then a second bit sequence is generated from the signal.
  • the first and / or the second line signal decoding process may, in particular, be a decoding process which does not comprise a digital-to-analog conversion.
  • the first and / or the second line signal decoding process may, in particular, be a decoding process in which an analog-to-digital conversion takes place only once.
  • the radio signal coding process which generates the radio signal to be transmitted via the radio channel from the bit sequence to be transmitted to the subscriber station, as well as the radio signal decoding process, which generates the transmitted bit sequence from the radio signal transmitted by the subscriber station, is executed completely by the master base station.
  • the master base station is responsible for the modulation of the radio signal, i. H. the modulation in baseband (baseband modulation) and the up-conversion into the RF frequency band, as well as for the demodulation of the radio signal, d. H. down-converting to baseband and demodulating in baseband (baseband demodulation).
  • the invention is based on the finding that considerable advantages can be realized if, in contrast to the solutions known from the prior art, the generation of the radio signal required in the downlink, in particular the modulation, does not occur in the master base station only in the relay base station is performed. In a corresponding manner, it is advantageous if, in contrast to the solutions known from the prior art, the demodulation of received radio signals required in the uplink is not carried out in the master base station, but already in the relay base station.
  • the radio communication unit of the relay base station is configured to execute the first radio signal coding process, which generates a first downlink radio signal from the downlink bit sequence, and to execute the first radio signal decoding operation an uplink radio signal received via the radio channel generates the first uplink bit sequence transmitted by at least one subscriber station.
  • the first radio signal coding process and the first radio signal decoding process in particular comprise the modulation or demodulation of the radio signal.
  • they may comprise a coding or decoding of the radio signal, in particular a source coding and / or a channel coding and / or a line coding or a source decoding and / or a channel decoding and / or a line decoding.
  • the invention offers the advantage that the radio signal adapted for transmission over the radio channel (i.e. over an air interface) does not have to be transmitted via the transmission line between the master base station and the relay base station. Rather, according to the invention, advantageously a line signal adapted to the line-based transmission can be used for transmission via the transmission line.
  • the first and the second line signal coding process in the downlink or in the uplink generate from the downlink bit sequence or the uplink bit sequence the downlink line signal or the uplink line signal.
  • the transmission via the transmission line can take place with a comparatively low data rate and thus with a comparatively narrow-band line signal.
  • the transmission line only for the transmission to at least one subscriber station (in the downlink) or for at least one subscriber station transmitted (in the uplink) digital raw data, the payload and payload / or control data and / or signaling data may be transmitted as a wired transmission over the transmission line between the master base station and the relay base station.
  • preamble, pilot symbols and training sequences which are in a digital radio network with the Radio signal are transmitted via the radio channel between the base station and subscriber stations, for example, to enable synchronization and / or channel equalization within the physical layer (PFIY) of the radio communication units involved in the radio communication.
  • PFIY physical layer
  • the transmission line there is advantageously no need to transmit the high frequencies characteristic of radio signals via the transmission line.
  • the need to transmit an RF radio signal via the transmission line is eliminated.
  • it is advantageously possible to use for transmission via the transmission line for example, a transmission in the baseband. This offers the advantage that the spectrum of the line signal transmitted via the transmission line has particularly low frequencies.
  • a transmission line for the conducted transmission between master base station and relay base station low-frequency transmission lines, i. Transmission lines that allow only the transmission of a low data rate, and / or narrow-band transmission lines, i. Transmission lines, which have a low cutoff frequency to use, and yet to achieve an error-free transmission over the transmission line. This can reduce the installation effort and associated extension area costs.
  • low-frequency transmission lines i. Transmission lines that allow only the transmission of a low data rate, and / or narrow-band transmission lines, i. Transmission lines, which have a low cutoff frequency to use, and yet to achieve an error-free transmission over the transmission line.
  • This can reduce the installation effort and associated extension area costs.
  • cables already present in buildings examples include telephone lines or lines for fire alarm systems, which can be present in buildings anyway.
  • a further advantage according to the invention is that the first and / or the second line signal coding process and / or the first and / or the second line signal decoding process optimally match the transmission characteristics of the used Transmission line can be adjusted.
  • the first and / or the second line signal coding process can advantageously comprise, for example, a line coding and the respectively associated line signal decoding operation a line decoding which optimally matches the transmission properties of the transmission line between the master base station and the relay line. Base station are adjusted.
  • the relay base station can be placed in a position that has insufficient or no radio coverage by the master base station.
  • a connection of the master base station and the relay base station is possible, for example, via simple cables such as telephone lines or lines for fire alarm systems.
  • a further use of existing cabling is conceivable, as it already exists, for example, for analogue building radio systems.
  • the invention can be used advantageously in ships.
  • the master base station has a radio communication unit configured for radio communication with the at least one subscriber station of the digital radio network.
  • the radio communication unit of the master base station is in this case configured to execute a second radio signal decoding process which generates a second uplink bit sequence transmitted from at least one subscriber station from an uplink radio signal received via the radio channel.
  • the radio communication unit of the master base station is configured to perform a second radio signal coding operation, which generates a second downlink radio signal from the downlink bit sequence, and to transmit the second downlink radio signal over the radio channel.
  • the master base station of the communication system therefore also has its own radio communication unit in addition to the line interface unit. It may, for example, a conventional Radio communication unit of a conventional base station of the digital radio network act. In particular, it may be a radio communication unit compatible with the radio standard that governs the digital radio network.
  • the master base station can be set up to transmit certain data parallel to the line-bound transmission by means of the first line interface unit for transmission to at least one subscriber station and also by means of the radio communication unit of the master base station via the radio channel.
  • the master base station can in particular be set up to transmit the data via the radio communication unit and via the first circuit-bound interface unit such that the transmission of the radio signals by the communication units of the master base station and the relay base station takes place synchronously.
  • Such an embodiment of the invention offers the advantage that an additional extension of the radio coverage area of the communication system according to the invention can be achieved over the radio range of the at least one relay base station, since both the radio communication unit of at least one relay Base station as well as the radio communication unit of the at least one master base station can be used for the radio coverage.
  • the relay base station is adapted to transmit downlink radio signals on the same carrier frequency as at least one other radio communication unit and time-synchronous to the at least one other radio communication unit via their radio communication unit .
  • This at least one other radio communication unit can be a radio communication unit of a relay base station and / or a radio communication unit of a master base station.
  • the relay base station transmits the radio signals emitted by it on the same carrier frequency as the at least one master base station and / or on the same carrier frequency as at least one other relay base station.
  • the relay base station transmits the radio signals transmitted by it in a time-synchronized manner. chron to the at least one master base station and / or to at least one other relay base station.
  • the at least one master base station and the at least one relay base station can thus advantageously form a constant velocity network.
  • the use of the same carrier frequency offers the advantage that the necessity of occupying a further carrier frequency, ie the occupation of a further frequency channel, is eliminated, so that the frequency resources can be used efficiently.
  • the time-synchronous transmission offers the advantage that occurring co-channel interference during reception of the downlink radio signal by the subscriber stations of the radio network, which can not be compensated by the receiving radio communication unit of the respective subscriber station, are avoided.
  • the first and / or the second line interface unit is adapted to delay the line-based communication, i. a delay in communication over the transmission line between the master base station and the relay base station, to be determined by measurement and processed for synchronization purposes.
  • the measurement and processing of the delay can take place, for example, in the context of an initialization of the connection between the master base station and the relay base station, in particular in the context of a flagshake protocol.
  • the delay may in particular be an end-to-end delay and / or a round trip time.
  • the delay may in particular comprise a transmission delay and / or a propagation delay and / or a processing delay and / or a queue delay.
  • the processing for synchronization purposes may in particular comprise a storage of the delay determined by measurement and / or the determination of a synchronization information from the delay determined by measurement.
  • Such an embodiment of the invention offers the advantage of enabling reliable synchronization between the master base station and the relay base station, in particular reliable time-synchronized transmission of the radio signals transmitted by the master base station and the relay base station, because the synchronization can take into account the actual delay of the wired communication over the transmission line.
  • the master base station is set up to transmit synchronization information via the transmission line by means of the first line interface unit.
  • the synchronization information is used to synchronize various master and / or relay base stations.
  • the relay base station can be configured to receive and process synchronization information transmitted via the transmission line by means of the second line interface unit and to synchronize the relay base station depending on the received synchronization information, in particular synchronization of the the radio communication unit of the relay base station transmitted downlink radio signals to perform.
  • the relay base station may be configured to transmit via the transmission line serving synchronization information by means of the second line interface unit for synchronizing various master and / or relay base stations.
  • the master base station may be configured to receive and process synchronization information transmitted via the transmission line by means of the first line interface unit and, depending on the received synchronization information, to synchronize the master base station, in particular a synchronization of the the radio communication unit of the master base station transmit downlink radio signals to perform.
  • the first and / or second line interface unit is set up to transmit and / or receive synchronization information via the transmission line with the downlink line signal and / or with the uplink line signal.
  • the synchronization information serves to synchronize various master and / or relay base stations.
  • the synchronization information can be used in particular for synchronizing the downlink radio signals transmitted by the radio communication units of the various master and / or relay base stations.
  • the transmission of the downlink radio signals between different master and / or relay base stations, in particular between the at least one master base station and the at least one relay base station can be synchronized.
  • synchronization of a reference clock and / or a frequency synchronization between different master and / or relay base stations, in particular between the at least one master base station and the at least one relay base station can also take place in this way, for example ,
  • the synchronization information can thus be used for time synchronization and / or frequency synchronization of various master and / or relay base stations. In particular, they can be used for time synchronization and / or for frequency synchronization of the at least one master base station and the at least one relay base station.
  • the transmission of the synchronization information can advantageously take place in particular with the downlink line signal and / or with the uplink line signal, in particular the synchronization information can be part of the downlink line signal and / or the uplink line signal.
  • the synchronization information transmitted via the transmission line can advantageously be used, in particular, for synchronizing one of the transmission signals transmitted via the transmission line
  • the TDMA frame structure of the digital radio network used the radio channel.
  • the master base station and / or the relay base station can also be configured to synchronize the TDMA frame structure used for the transmission over the radio channel between different master and / or relay base stations, in particular between the at least one, depending on the received synchronization information a master base station and the at least one relay base station.
  • the synchronization information for example, the time of the beginning and / or the end of a time slot of the TDMA frame structure display.
  • the synchronization information may, for example, indicate the beginning and / or the end of each time slot of the TDMA frame structure.
  • the synchronization information may, for example, indicate the beginning and / or the end of each time slot of the TDMA frame structure.
  • the synchronization information may, for example, have the form of a synchronization signal.
  • the synchronization signal may be part of the downlink line signal and / or the uplink line signal.
  • the synchronization information can be generated in particular by a line coding carried out in the context of the first line signal coding process and / or the second line signal coding process. It is advantageously possible, for example, to transmit the synchronization information in the form of control words of a line code, eg in the form of K words of a line code.
  • the beginning of a line code can be triggered by a start-of-frame control word of the line code
  • Time slot of the TDMA frame structure are displayed and / or displayed by an end-of-frame control word the end of a time slot of a TDMA frame structure.
  • a start-of-frame control word can be used as synchronization information with each time slot of the TETRA radio channel as part of the downlink line signal and / or as Be transmitted over the transmission line part of the uplink line signal, so that the Master base station and the relay base station to synchronize the beginning of the time slot of the TETRA frame structure.
  • the delay in the line-based communication between the master base station and the relay base station in particular the delay determined by measurement, can advantageously be taken into account.
  • the synchronization information it is advantageously possible, for example, for the synchronization information to contain a time offset necessary for the synchronization of the transmission of the radio signals from the master base station and the relay base station.
  • Such synchronization of various master and / or relay base stations in particular such synchronization of the at least one master base station and the at least one relay base station, via the line interface units of the master base station and the relay base station has the advantage of that an otherwise required synchronization system for external synchronization, for example, using a GPS receiver or other suitable for a time synchronization satellite receiver, can be dispensed with.
  • the master base station transmits the synchronization information to the relay base station via the transmission line, then advantageously it is possible to dispense with equipping the relay base station with a GPS receiver for time synchronization, such as, for example, communication systems known from the prior art, In particular, known from the prior art communication systems in the field of dc networks require.
  • the radio communication unit of the relay base station is set up so that the first radio signal coding process comprises a baseband modulation and an upward mixing to a carrier frequency and / or the first radio signal decoding process downsampling to baseband and baseband demodulation.
  • the data rate required for transmission via the transmission line and the bandwidth required for this purpose can thereby be considerably reduced.
  • the signal quality is not affected in this way, since the analog-to-digital conversion (in the uplink) and the digital-to-analog conversion (in the downlink) must be done only once.
  • the baseband radio signal is available in the relay base station.
  • the specifications regarding permissible adjacent channel interference from the relay base station can be kept comparatively simple in the downlink.
  • the signal quality in particular the signal-to-noise ratio (SNR)
  • SNR signal-to-noise ratio
  • Baseband modulation, i. A modulation in the baseband also offers the advantage that the signal processing required for this purpose has a comparatively low complexity.
  • the transmission line is an untwisted copper double wire or is an untwisted copper pair, which may be formed in particular unshielded or.
  • the transmission line may be a twisted pair cable connection, in particular an unshielded twisted pair cable connection.
  • the transmission line can be an unshielded four-core or unshielded twisted pair two-wire cable connection.
  • the transmission line in this embodiment of the invention may be a telecommunication cable and / or a fire alarm cable and / or a line of an analog building radio system.
  • ⁇ may be a shielded or unshielded, in particular four-core or two-core, twisted-pair cable connection and / or
  • a telecommunication cable and / or a fire alarm cable and / or a telephone line and / or a line of a fire alarm system and / or a line of an analog building radio system can be.
  • Such an embodiment of the invention with such a transmission line has the advantage that the transmission line is configured relatively simple and therefore cost-effective.
  • Particular advantages of this embodiment of the invention result from the fact that the aforementioned types of transmission line are already present in many buildings in which the communication system can be used. This allows a particularly simple and therefore cost-effective installation of the communication system.
  • the advantage of using a pair of copper pairs or a four-wire twisted pair connection is that a full-duplex transmission over the transmission line can be realized by using a wire pair for transmission in the downlink and a wire pair for transmission in the uplink.
  • duplex transmission can be realized by, for example, a time division duplex method and / or a frequency division duplex method.
  • the use of a copper double wire or a two-wire twisted Pair cable connection offers the advantage that in this way the expense and costs of installing the communication system can be kept very low.
  • the transmission line can be, for example, any twisted pair cable, in particular a twisted pair cable of categories 1 to 8.
  • the transmission line but, for example, also be a fiber optic cable.
  • the generation of a line code i. a line coding includes.
  • the line coding may in particular comprise the generation of a 4b5b code and / or an 8b1 ob code and / or a 64b66b code and / or a Manchester code and / or a differential Manchester code.
  • the line coding may comprise the generation of an NRZ code and / or an NRZI code and / or an NRZ-M code and / or an NRZ-S code.
  • the line coding may in particular comprise the generation of an RZ code and / or an HDB-3 code and / or a B8ZS code and / or an FM code and / or an MFM code.
  • Such a generation of a line code advantageously makes it possible to optimally adapt the downlink line signal and / or uplink line signal transmitted via the transmission line to the properties of the transmission line.
  • control words which, for example, serve for synchronization and / or indicate a device ID.
  • it is in this way for example.
  • an error detection using the line code for this purpose, for example, in the receiver can be checked whether each start-of-frame control word an end-of-frame control word follows, if the line code so provides.
  • the downlink line signal generated by the first line signal coding process and / or the uplink line signal generated by the second line signal encoding process is a baseband signal.
  • Such a configuration of the line signal as a baseband signal offers the advantage that the line signal transmitted via the transmission line has particularly low frequencies.
  • a particularly simple transmission line can be used as the transmission line, which has a low limit frequency and therefore only permits transmission of comparatively low frequencies.
  • such a configuration of the line signal as a baseband signal offers the advantage that the transmission technology required for this purpose is of comparatively low complexity and can therefore be provided at low cost.
  • the first and / or the second line signal coding process comprises a modulation.
  • the line signal coding process can be in particular a pulse amplitude modulation (PAM) and / or a pulse width modulation (PWM) and / or a pulse position modulation (PPM) and / or an amplitude shift keying (ASK) and / or a frequency shift keying ( Frequency Shift Keying, FSK) and / or phase shift keying (PSK) and / or square-wave amplitude modulation (QAM).
  • the phase shift keying may be a binary phase shift keying (BPSK) or a quadrature phase shift keying (QPSK).
  • Such an embodiment of the invention in which the first and / or the second line signal coding process comprises a modulation, offers the advantage that the line signal can be adapted by the modulation individually to the transmission characteristics of the transmission line.
  • a particularly efficient and / or particularly reliable transmission via the transmission line can be achieved.
  • the first and / or the second line interface unit is adapted to connect the downlink line signal and / or the uplink line signal with a data link.
  • - 21 - to transmit and / or receive rates over the transmission line that is less than or equal to 1 Mbit / s.
  • the data rate can advantageously be in particular less than or equal to 500 kbit / s.
  • the data rate may advantageously be less than or equal to 200 kbit / s.
  • the data rate can be advantageously less than or equal to 150 kbit / s.
  • Such an embodiment of the invention offers the advantage that a particularly simple transmission line, which allows only a transmission of low data rates, can be used to connect the master base station and the relay base station. This makes a particularly simple and inexpensive installation of the communication system possible.
  • the digital radio network is a TETRA standard trunked radio network whose data rate relative to the MAC sub-layer of the data link layer is only 36 kbit / s
  • a transmission of the baseband radio signal of the TETRA standard (I component and Q component) over the transmission line would require a significantly higher data rate of more than 1 Mbit / s.
  • the second line interface unit is adapted to transmit with the uplink line signal signal quality information, the signal quality transmitted by at least one subscriber station and received by the radio communication unit of the relay base station uplink Radio signal indicates.
  • signal quality information may include, for example, a CRC check value and / or an RSSI value and / or other signal quality indicator indicating a signal quality of the received uplink radio signal.
  • Such an embodiment of the invention offers the advantage that the master base station, in particular the processing unit of the master base station, receives information about the signal quality of the relay base station. receives an uplink radio signal. On this basis, it is possible for the master base station, in particular the master base station processing unit, to estimate the likelihood of transmission errors in the uplink bit string received via the first line interface unit and to allocate the received uplink bit sequence account.
  • the master base station has a decision unit.
  • the decision unit is set up to process signal quality information of the type described above.
  • the signal quality information indicates the signal quality of an uplink radio signal received from the communication unit of the relay base station from which the first uplink bit string was generated.
  • the signal quality information indicates the signal quality of an uplink radio signal received from the communication unit of the master base station from which the second uplink bit string has been generated.
  • the decision unit is set up to select an uplink bit sequence as a function of the signal quality information from a plurality of uplink bit sequences transmitted by the same subscriber station.
  • the decision unit is set up to combine a plurality of uplink bit sequences for error detection and / or for error correction.
  • both the master base station and the relay base station of the communication system according to the invention have a radio communication unit set up for radio communication with the at least one subscriber station of the digital radio network, it is possible for the uplink radio signal transmitted by a particular subscriber station multiple, namely, both from the radio communication unit of the master base station and from the radio communication unit of the relay base station is received.
  • the communication system according to the invention has several relay base stations each having a radio communication unit configured for radio communication with the at least one subscriber station. In this case too, there is a possibility that one of a specific participant on transmitted uplink radio signal is received multiple times, namely from the various radio communication units of multiple relay base stations.
  • the radio signal decoding processes of the radio communication units of the receiving master base station or of the receiving relay base station each generate an uplink bit sequence from the respectively received uplink radio signal. If, for example, an uplink radio signal transmitted by a specific subscriber station of the digital radio network is received both by the master base station and by the relay base station, then the radio communication unit of the master base station generates the second from the received uplink radio signal The uplink bit sequence and the radio communication unit of the relay base station generates the first uplink bit sequence from the received uplink radio signal, resulting in a plurality of uplink bit sequences transmitted by the same subscriber station.
  • the relay base station transmits the first uplink bit sequence generated by it in the manner described above via its line interface unit to the master base station.
  • a plurality of uplink bit sequences namely two uplink bit sequences transmitted by the same subscriber station, are thus available in the master base station.
  • the master base station has a decision unit which makes such a decision on the basis of signal quality information which determines the signal quality of the respective received uplink radio signal with which the respective uplink bit sequence is transmitted by the subscriber station. was displayed.
  • the relay base station may be adapted to receive signal quality information by means of its radio communication unit, which signal quality is received by the radio communication unit of the relay base station Display up to generate and generate uplink radio signal to the master base station by means of their second line-bound interface unit.
  • the master base station can be set up to generate signal quality information, which indicates the signal quality of an uplink radio signal received by the radio base station base station radio communication unit, by means of its radio communication unit.
  • the decision unit of the master base station can now, for example, select an uplink bit sequence from the plurality of uplink bit sequences, for example by selecting that uplink bit sequence whose assigned signal quality show a better signal quality.
  • the signal quality information may include an RSSI value indicating the signal strength with which the uplink radio signal was received.
  • the decision unit of the master base station can, for example, select the uplink bit sequence from the plurality of uplink bit sequences which has the best RSSI value.
  • uplink bit sequences can be compared by the decision unit in order to realize an error detection.
  • a plurality of uplink bit sequences can be combined with one another in order to enable a correction of transmission errors.
  • those parts of the respective uplink bit sequence can be used for further processing, which are displayed as error-free by the signal quality information.
  • Such an embodiment of the invention with a master base station having a decision unit of the type described above offers the advantage that the frequency of transmission errors in the uplink by the selection of multiple uplink bit sequences and / or the combination of several uplink bit sequences significantly reduced and thus the reliability of the transmission in the uplink can be improved.
  • the digital radio network and the radio communication units comply with the TETRA standard (Terrestrial Trunked Radio).
  • the digital radio network and the radio communication units can correspond in particular to the TETRA standard according to Release 1 and / or the TETRA standard according to Release 2.
  • the digital radio network and the radio communication units to the DMR standard Digital Mobile Radio
  • the digital radio network and the radio communication units can comply with the TETRAPOL standard.
  • the digital radio network and the radio communication units may conform to the PDT standard (Professional Digital Trunking or police Digital Trunking).
  • the digital radio network and the radio communication units can conform to the P25 standard (Project 25 or APCO-25).
  • the digital radio network and the radio communication units may conform to the GSM standard (Global System for Mobile Communications).
  • the digital radio network and the radio communication units can advantageously correspond to a standard for narrowband digital radio, in particular a standard for narrowband digital trunked radio.
  • the digital radio network and the radio communication units are provided with at least one proprietary narrowband system, e.g. are compatible with a proprietary narrowband system from Motorola or a proprietary narrowband system from another manufacturer, particularly a proprietary narrowband trunked radio system.
  • the digital radio network is a digital trunked radio network.
  • the radio communication unit is a digital trunked radio communication unit.
  • a trunked radio network is understood to be a professional mobile radio network (PMR).
  • PMR professional mobile radio network
  • Such digital trunked radio networks are of particular importance for authorities and organizations with security tasks, for example the police, fire brigade and civil protection, as well as for operational radio purposes, for example plant protection, factory fire brigade, maintenance and logistics, and are therefore frequently used in these areas.
  • These applications require a particularly high reliability of communication, i. in particular a particularly comprehensive and reliable radio coverage.
  • Such an embodiment of the invention therefore offers the advantage that the use of the invention in digital trunked radio networks makes it possible to expand the coverage area of base stations and thus to improve the reliability of the communication, especially in those areas of application which are particularly reliable nationwide radio coverage required.
  • a master base station for a digital radio network with the features of the master base station of a communication system according to the invention of the type described above.
  • a relay base station for a digital radio network with the features of the relay base station of a communication system according to the invention of the type described above.
  • a line interface unit for a digital radio network with the features of the first line interface unit and / or the second line interface unit.
  • Figure 1 is a schematic representation of a communication system according to the invention and its application for the extension of the supply area within a building;
  • FIG. 2 shows a schematic representation of the communication system according to the invention in the OSI reference model.
  • FIG. 1 shows a communication system 1 according to the invention for a digital radio network, which in this example is a digital trunked radio network according to the TETRA standard.
  • the communication system 1 according to the invention is used in this exemplary embodiment in order to expand the coverage area of the digital TETRA trunking network in the area of a building 26, in particular within the building 26.
  • the communication system 1 has a master base station 3, on which is arranged on the roof of the building 26, and a relay base station 5, which is located locally remote from the master base station 3, namely inside the building 26.
  • the master base station 3 has a processing unit 7, a first line-bound interface unit 9 connectable to a transmission line 8 for line-bound communication with the relay base station 5, one set up for radio communication with the subscriber stations 6 of the digital trunked radio network Radio communication unit 11, which corresponds to the TETRA standard, a decision unit 19 and an antenna 21 on.
  • the antenna 21 is signal-conducting connected to the radio communication unit 1 1.
  • the processing unit 7 is connected via the decision unit 19 to the first line interface unit 9 on the one hand and to the radio communication unit 11 of the master base station 3 on the other hand.
  • the processing unit 7 of the master base station 3 is adapted to a downlink bit sequence, which is for transmission to a subscriber station 6 of the digital Radio network is determined via a radio channel to pass to the first line interface unit 9.
  • the processing unit 7 is further configured to take over a first uplink bit sequence transmitted by a subscriber station 6 from the first line interface unit 9.
  • the downlink bit sequence and the uplink bit sequence are digital data, as in the protocol stack of a base station of a digital radio network prior to transfer to a physical layer (PFIY) of a radio communication unit 11 in the downlink or as in the protocol stack after the transfer from a bit transmission layer (PFIY) of a radio communication unit 11 to an overlying layer in the uplink.
  • PFIY physical layer
  • the downlink bit sequence and the uplink bit sequence are sequences of modulation bits.
  • the downlink bit sequence is a bit sequence which has not yet been processed by the baseband processing part of the radio communication unit 11 of the master base station 3.
  • the uplink bit string is a bit string which has already been processed by the baseband processing part of the radio communication unit 12 of the relay base station 5, that is, has been completely demodulated.
  • the first line-connected interface unit 9 is configured to take over the downlink bit sequence from the processing unit 7 and to execute a first line signal coding process which directly generates a downlink line signal 13 from the downlink bit sequence.
  • the downlink line signal 13 generated by the first line signal coding process is a baseband signal in this exemplary embodiment.
  • the first line signal coding process is designed in this embodiment as line coding, which comprises the generation of a line code, namely an 8b1 Ob code.
  • the first line interface unit 9 is also configured to transmit the downlink line signal 13 to the relay base station 5 via the transmission line 8 connected to the first line interface unit 9.
  • the downlink line signal 13 is transmitted via the transmission line 8 at a data rate of 133 kbit / s.
  • the first line interface unit 9 is furthermore set up to determine a delay of the line-bound communication, namely a round trip time, between the master base station 3 and the relay base station 5 by measurement and to process it for synchronization purposes.
  • the first The interface-related interface unit 9 processes the measured delay into synchronization information which serves to synchronize the relay base station 5 and the master base station 3.
  • the master base station 3 is set up to transmit the synchronization information via the transmission line 8 to the relay base station 5 by means of its first line interface unit 9 for synchronization of the master base station 3 and the relay base station 5.
  • the synchronization information is transmitted for this purpose as a control word of the line code with the downlink line signal 13, namely as a start-of-frame control word, which indicates the beginning of a Zeitschlit ZES the TDMA frame structure of the TETRA trunked radio network.
  • the transmission line 8 is designed as an unshielded four-core twisted pair cable connection, i. as an unshielded pair of twisted copper pairs.
  • This offers the advantage that existing cabling in the building 26 can be used for the line-based communication between the master base station 3 and the relay base station 5.
  • the use of a pair of copper pairs, i. a four-wire cable connection offers the advantage that a full-duplex transmission is possible by using a wire pair for transmitting the downlink line signal 13 and a wire pair is used to transmit the uplink line signal 14.
  • the radio communication unit 11 of the master base station 3 is configured to execute a second radio signal coding operation, which generates a second downlink radio signal 17 from the downlink bit sequence, and the second downlink radio signal 17 to a subscriber station 6 via the radio channel transfer.
  • the radio communication unit 11 of the master base station 3 is also configured to perform a second radio signal decoding process, which consists of a received over the radio channel uplink radio signal 15 b, which was transmitted from a subscriber station 6, a second uplink bit sequence, which the subscriber station 6 has been transmitted generated.
  • the relay base station 5 has a radio set up for radio communication with the subscriber stations 6 of the digital radio network. Communication unit 12 and connected to the transmission line 8 second line interface unit 10, which is adapted for wired communication with the master base station 3.
  • the relay base station 5 also has a processing unit 24, which is connected both to the second line interface unit 10 and to the first radio communication unit 12.
  • the relay base station 5 also has an antenna 22 which is signal-conducting connected to the radio communication unit 12.
  • the second line interface unit 10 is connected to the transmission line 8 and is configured to receive the downlink line signal 13 transmitted via the transmission line 8 and to execute a second line signal decoding process which directly derives from the received downlink line signal 13 generates the downlink bit sequence, and to transmit the downlink bit sequence to the radio communication unit 12 of the relay base station 5.
  • the transfer of the downlink bit sequence is done indirectly in this embodiment via the processing unit 24th
  • the relay base station 5 is set up to receive and process the synchronization information transmitted by the master base station 3 via the transmission line 8 by means of the second line interface unit 10 and on this basis to completely synchronize the relay base station 5 with the master Base Station 3 perform.
  • the relay base station 5 is set up to synchronize the TDMA frame structure of the TETRA trunked radio network with the master base station 3 and in this way to synchronize the downlink transmitted by the radio communication unit 12 of the relay base station 5 -Funksignale 16 bring about.
  • the radio communication unit 12 of the relay base station 5 is configured to take over the downlink bit sequence, which is intended for transmission to a subscriber station 6 of the digital radio network via a radio channel, from the second line interface unit 10 and to perform a first radio signal coding operation from the downlink bit sequence the first downlink radio signal 16 testifies and to transmit the first downlink radio signal 16 via the radio channel by means of the antenna 22.
  • the first radio signal coding operation carried out by the radio communication unit 12 of the relay base station 5 comprises baseband modulation and up-converting to the carrier frequency of the radio channel, so that the entire modulation of the downlink radio signal 16, which in FIG Form of a FIF radio signal is transmitted via the antenna 22, takes place in the relay base station 5.
  • the relay base station 5 is set up, via its radio communication unit 12, the downlink radio signal 16 on the same carrier frequency as the radio communication unit 11 of the master base station 3 and synchronously with the radio communication unit 11 of the master Base station 3 to transmit.
  • the radio communication unit 12 of the relay base station is configured to carry out a first radio signal decoding process, which comprises the first uplink radio signal 15a transmitted via the radio channel by means of the antenna 22 and transmitted by a subscriber station 6. Bit sequence, which was transmitted from the subscriber station 6, generated.
  • the uplink radio signal 15a is received as a FIF radio signal via the antenna 22 from the radio communication unit 12.
  • the radio signal decoding operation performed by the radio communication unit 12 includes down-converting to the baseband and baseband demodulation, so that the uplink radio signal 15a is completely demodulated in the relay base station 5.
  • the radio communication unit 12 of the relay base station 5 is also set up to transfer the first uplink bit sequence to the second line interface unit 10. The transfer takes place in this example indirectly via the processing unit 24 of the relay base station 5.
  • the radio communication unit 12 of the relay base station 5 is also configured in this exemplary embodiment to generate a signal quality information which the signal quality of the Radio communication unit 12 of the relay base station 5 received uplink radio signal 15 a, from which the first uplink Bit sequence was generated.
  • the signal quality information in this embodiment includes an RSSI value and a CRC check value.
  • the radio communication unit 12 is further configured to transfer the generated signal quality information to the second line interface unit 10, so that the signal quality information can be transmitted with the uplink line signal 14 via the transmission line 8 to the master base station 3.
  • the second line interface unit 10 of the relay base station 5 is configured to take over the first uplink bit sequence from the radio communication unit 12 and to execute a second line signal encoding process which directly generates the uplink line signal 14 from the first uplink bit sequence.
  • the second line signal coding operation in this embodiment is a line coding which comprises the generation of a line code, namely the generation of an 8b1 Ob code.
  • the uplink line signal generated by the second line signal encoding process is a baseband signal in this embodiment.
  • the second line interface unit 10 is further configured to transmit the uplink line signal 14 to the master base station 3 via the transmission line 8 connected to the second line interface unit 10.
  • the transmission of the uplink line signal takes place in this embodiment with a data rate of 150 kbit / s.
  • the second line interface unit 10 of the relay base station 5 is configured to transmit the signal quality information generated by the radio communication unit 12 of the relay base station 5 with the uplink line signal 14 to the master base station 3.
  • the signal quality information is transmitted in this embodiment as a control word of the line code with the uplink line signal 14 to the master base station 3.
  • the first line interface unit 9 of the master base station 3 is set up to transmit from the relay base station 5 via the transmission line 8 connected to the first line-connected interface unit 9 Receive uplink line signal 14 and perform a first line signal decoding process, which directly generates from the received uplink line signal 14, the first uplink bit sequence.
  • the first line interface unit 9 of the master base station 3 is also configured to pass the first uplink bit sequence to the processing unit 7. In this exemplary embodiment, the transfer takes place indirectly from the first line-bound interface unit 9 via the decision unit 19 to the processing unit 7.
  • An uplink radio signal transmitted from a subscriber station 6 can be received multiple times in such a scenario, namely both from the radio communication unit 12 of the relay base station 5 and from the radio communication unit 11 of the master base station 3.
  • the radio communication unit 11 In this exemplary embodiment, the master base station 3, like the radio communication unit 12 of the relay base station 5, is therefore configured to generate signal quality information which comprises an RSSI value and a CRC check value and the signal quality of the signal communicated by the communi - cation unit 11 of the master base station 3 received uplink radio signal 15 b, from which the first uplink bit sequence was generated indicates.
  • the decision unit 19 of the master base station 3 is set up to receive both the signal quality information generated by the relay base station 5 and the uplink line signal 14 from the relay base station to the master base station 3 and that of the radio communication unit 11 the master base station 3 to process generated signal quality information. In this way, the decision unit 19 receives information both on the signal quality of the uplink radio signal received by the radio communication unit 12 of the relay base station 5 and on the signal quality of the uplink received from the radio communication unit 11 of the master base station 3. Radio signal, both received radio signals were transmitted from the same station 6 participants.
  • the decision unit 19 is set up to select from the two uplink bit sequences available in the master base station 3 by comparison of the associated signal quality information that uplink bit sequence whose associated signal quality information indicates a better signal quality ,
  • the embodiment of the inventive communication system 1 shown in FIG. 1 enables a reliable and simple expansion of the coverage area of the digital radio network, whereby a simple and already existing transmission line can be used.
  • the exemplary embodiment shown makes it possible to dispense with an external synchronization of the relay base station 5 with the aid of a GPS receiver or in any other way.
  • FIG. 2 shows a schematic representation of the inventive communication system 1 in the OSI reference model. Shown are a master base station 3, a relay base station 5 located locally remote from the master base station 3, which is connected to the master base station 3 via a transmission line 8, and two subscriber stations 6.
  • the digital radio network and the radio - Communication units again comply with the TETRA standard, ie
  • the digital radio network is also a digital trunked radio network in this exemplary embodiment.
  • the master base station 3 has a first physical layer 31, which is the physical layer of the wireless communication unit 11. Via the antenna 21, the master base station 3 can receive uplink radio signals 15a from the subscriber station 6 and transmit downlink radio signals 17 to the subscriber station 6.
  • the master base station 3 also has a second physical layer 32, which is the physical layer of the first wired interface unit 9.
  • the physical layer 32 forms the interface to the line-bound transmission medium in the form of the transmission line 8 and enables light of the master base station 3, the transmission of downlink line signals 13 and the reception of uplink line signals 14th
  • the master base station 3 also has a lower MAC sublayer (Lower MAC) and an upper MAC sublayer (Upper MAC).
  • the lower MAC sublayer and the upper MAC sublayer are components of the link layer of the OSI reference model. Between the lower MAC sublayer 33 and the upper MAC sublayer 34, the decision unit 19 is arranged. In addition, the master base station 3 includes higher layers 35.
  • the first physical layer 31 transfers data to the lower MAC sublayer 33 in the uplink and takes over data from the lower MAC sublayer 33 in the downlink.
  • the second physical layer 32 transfers data to the decision unit 19 in the uplink and takes over data from the lower one in the downlink MAC sublayer 33.
  • the lower MAC sublayer 33 transfers data in the uplink to the decision unit 19 and takes over data from the upper MAC sublayer 34 in the downlink.
  • the decision unit 19 transfers data to the upper MAC sublayer 34 in the uplink
  • Upper MAC sub-layer 34 transfers data to the higher layers 35 in the uplink and takes over data from the higher layers 35 in the downlink.
  • the relay base station 5 has a first physical layer 41, which is the physical layer of the radio communication unit 12 of the relay base station 5.
  • the bit transmission layer 41 is set up to receive uplink radio signals 15a from the subscriber station 6 via the antenna 22 and to transmit downlink radio signals 16 to the subscriber station 6.
  • the relay base station 5 also has a second physical layer 42 which is the physical layer of the second wired interface unit 10 of the relay base station 5.
  • the physical layer 42 forms the interface of the relay base station to the cable transmission medium in the form of the transmission line 8. directed to receive downlink line signals 13 over the transmission line and to transmit uplink line signals 14 over the transmission line.
  • the relay base station 5 has a lower MAC sub-layer 43 which forms part of the link layer of the OSI reference model.
  • the first physical layer 41 of the relay base station 5 transmits data in the uplink to the lower MAC sublayer 43 and takes over data from the MAC sublayer 43 in the downlink.
  • the data is unchanged from the second physical layer 42 of the relays Base station 5 is forwarded via the lower MAC sub-layer 43 to the first physical layer 41, ie In the downlink, no further processing of the data takes place in the lower MAC sublayer 43.
  • the second physical layer 42 transfers data to the lower MAC sub-layer 43 in the downlink and takes over data from the lower MAC sub-layer 43 in the uplink.
  • the physical layers 31 and 41 which are responsible for the radio communication with the subscriber stations 6, comprise both a baseband processing part and a high-frequency processing part.
  • the physical transmission layers 31 and 41 responsible for the radio communication are responsible for the following tasks: modulation (p / 4-DQPSK in this embodiment), burst generation, channel coding, synchronization.
  • modulation p / 4-DQPSK in this embodiment
  • burst generation p / 4-DQPSK in this embodiment
  • channel coding synchronization
  • convolutional codes can be used for channel coding.
  • the lower MAC sublayer (lower MAC) is responsible for the following functions in the embodiment shown in FIG. 2: descrambling, block deinterleaving, depuncturing, viterbi decoding, block decoding.
  • the upper MAC sublayer (upper MAC) is responsible for the following functions in the embodiment shown in FIG. 2: Access Control, Air Interface Encryption, Channel Quality Measurement, Power Control Measurement. LIST OF REFERENCE NUMBERS

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

Abstract

L'invention décrit un système de communication pour un réseau radio numérique qui permet un élargissement de la zone d'alimentation du réseau radio, pourvu d'au moins une station de base maître et d'au moins une station de base relais dont la position est éloignée de celle de la station de base maître. La station de base maître et la station de base relais comportent chacune une unité d'interface câblée pouvant être connectée par un câble de transmission pour la communication câblée entre la station de base maître et la station de base relais. Au moins la station de base relais comporte en outre une unité de communication radio destinée à une communication radio avec une station d'abonné du réseau radio numérique. L'unité d'interface câblée de la station de base maître est destinée à coder un signal de câble en liaison descendante à partir d'une suite binaire déterminée en liaison descendante pour le transfert à une station d'abonné et à le transmettre au moyen du câble de transmission à la station de base relais ainsi qu'à décoder une suite binaire en liaison montante transmise par la station d'abonnée à partir d'un signal de câble en liaison montante reçu au moyen du câble de transmission. L'unité d'interface câblée de la station de base relais est destinée à décoder la suite binaire en liaison descendante à partir du signal de câble en liaison descendante reçu au moyen du câble de transmission, de sorte que celle-ci puisse être transmise au moyen de l'unité de communication radio à une station d'abonné, ainsi qu'à coder le signal de câble en liaison montante à partir de la suite binaire en liaison montante transmise par une station d'abonné et à le transmettre à la station de base maître au moyen du câble de transmission.
EP18807312.6A 2017-11-21 2018-11-21 Système de communication, station de base maître, station de base relais et unité d'interface câblée pour un réseau radio numérique Pending EP3714556A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017127469.3A DE102017127469B4 (de) 2017-11-21 2017-11-21 Kommunikationssystem, Master-Basisstation, Relais-Basisstation und leitungsgebundene Schnittstelleneinheit für ein digitales Funknetz
PCT/EP2018/082027 WO2019101776A1 (fr) 2017-11-21 2018-11-21 Système de communication, station de base maître, station de base relais et unité d'interface câblée pour un réseau radio numérique

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DE19649854B4 (de) * 1996-12-02 2013-07-18 T-Mobile Deutschland Gmbh Repeater für Funksignale
AUPP278998A0 (en) * 1998-04-03 1998-04-30 Telstra Corporation Limited A transmission system for a mobile communications signal
EP2410790B1 (fr) * 2009-03-17 2021-11-03 Huawei Technologies Co., Ltd. Procédé et dispositif d'envoi de paquet de données
DE102013112940B3 (de) 2013-11-22 2015-03-12 Kaitec Gmbh TETRA-DMO-Gleichwellen-Funknetzvorrichtung
DE102015220422A1 (de) 2015-06-18 2016-12-22 Power Plus Communications Ag System und Verfahren zur redundanten Anbindung an ein Backbone-Netzwerk sowie ein in diesem System einsetzbarer Uplink-Knoten
US10440688B2 (en) * 2016-01-14 2019-10-08 Samsung Electronics Co., Ltd. Frame structures and signaling techniques for a unified wireless backhaul and access network

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DE102017127469B4 (de) 2019-09-05
DE102017127469A1 (de) 2019-05-23

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