WO2017110029A1 - Appareil, système et procédé de communications sans fil - Google Patents

Appareil, système et procédé de communications sans fil Download PDF

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Publication number
WO2017110029A1
WO2017110029A1 PCT/JP2016/004799 JP2016004799W WO2017110029A1 WO 2017110029 A1 WO2017110029 A1 WO 2017110029A1 JP 2016004799 W JP2016004799 W JP 2016004799W WO 2017110029 A1 WO2017110029 A1 WO 2017110029A1
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WIPO (PCT)
Prior art keywords
wireless transmission
baseband signal
wireless
signal
baseband
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PCT/JP2016/004799
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English (en)
Japanese (ja)
Inventor
琢爾 飯塚
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日本電気株式会社
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Publication of WO2017110029A1 publication Critical patent/WO2017110029A1/fr

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • 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

Definitions

  • the present invention relates to a wireless communication device, a wireless communication system, and a wireless communication method, for example, a wireless communication device, a wireless communication system, and a wireless communication method suitable for efficient wireless communication.
  • Patent Document 1 discloses a technique related to an interface between a baseband processing device (BBU (Base Band Unit)) and a radio device (RRH (Remote Radio ⁇ Head)) constituting a base station device.
  • BBU Base Band Unit
  • RRH Remote Radio ⁇ Head
  • the configuration disclosed in Patent Document 1 transmits IQ data between a baseband processing device and a wireless device via a CPRI transfer path (wired).
  • the configuration of Patent Document 1 has a problem that the cost for arranging a cable such as an optical cable increases.
  • Patent Document 2 discloses a transmission method of IQ data between a baseband processing device (BBU (Base Band Unit)) and a wireless device (RRH (Remote Radio Head) constituting a base station device. As described above, a wireless transmission method is used.
  • BBU Base Band Unit
  • RRH Remote Radio Head
  • wireless transmission using a high-level modulation method is usually performed on a wireless transmission path between a baseband processing device and a wireless device. This enables wireless transmission at a wireless transmission rate that is equal to or higher than the required IQ data transmission rate.
  • the communication quality of the wireless transmission path is deteriorated due to external factors such as rainy weather, there is a problem that wireless transmission using a high multilevel modulation method becomes difficult.
  • the present invention has been made to solve such problems, and provides a wireless communication apparatus, a wireless communication system, and a wireless communication method capable of efficient wireless communication according to the communication quality of a wireless transmission path.
  • the purpose is to do.
  • a wireless communication device includes: a baseband processing unit that outputs a compressed compressed baseband signal; a first signal wireless transmission unit that transmits the compressed baseband signal as a wireless signal; A second signal wireless transmission unit that receives a compressed baseband signal by wireless transmission; and a wireless unit that transmits a wireless signal based on the compressed baseband signal received by the second signal wireless transmission unit.
  • the wireless communication apparatus includes a wireless unit that compresses a baseband signal corresponding to a wireless signal received wirelessly and outputs a compressed baseband signal, and the compressed baseband signal is a wireless signal.
  • a second signal wireless transmission unit that transmits the compressed baseband signal, a first signal wireless transmission unit that receives the compressed baseband signal by wireless transmission, and the compressed baseband signal received by the first signal wireless transmission unit.
  • a baseband processing unit that performs predetermined processing by decoding.
  • a wireless communication device includes a baseband processing device that generates a first baseband signal, and a first wireless transmission device that modulates the first baseband signal into a first microwave and wirelessly transmits the first baseband signal. And a second wireless transmission device that demodulates the first microwave received wirelessly via a wireless transmission path with the first wireless transmission device into the first baseband signal, and a demodulation by the second wireless transmission device A wireless device that modulates the first baseband signal thus generated into a first high-frequency signal and wirelessly transmits the signal to the outside, wherein the baseband processing device has a compression rate according to communication quality in the wireless transmission path.
  • the first wireless transmission device compresses the first baseband signal, and the first wireless transmission device uses the modulation method according to the communication quality in the wireless transmission path to convert the compressed first baseband signal to the first wireless baseband signal. To modulate the microwave.
  • a wireless communication device includes: a baseband processing device that generates a first baseband signal; and first and second divided baseband signals obtained by dividing the first baseband signal.
  • a first wireless transmission device that modulates the first divided baseband signal into a first microwave and wirelessly transmits the first wireless transmission device, and a second wireless transmission device that modulates the second divided baseband signal into a second microwave and wirelessly transmits the modulated signal
  • a third wireless transmission device that demodulates a first microwave received wirelessly via a first wireless transmission path between the first wireless transmission device and the first divided baseband signal, and the second wireless transmission
  • a fourth wireless transmission device that demodulates the second microwave received wirelessly via the second wireless transmission path to the device into the second divided baseband signal; and demodulated by the third and fourth wireless transmission devices Is A wireless device that modulates the first baseband signal reproduced by combining the first and second divided baseband signals into a first high-frequency signal and wirelessly transmits the first high-frequency signal to the outside; And the first baseband signal or the first and second
  • a wireless communication method includes generating a first baseband signal by a baseband processing device, modulating the first baseband signal to a first microwave, and wirelessly transmitting the first baseband signal, Demodulating the first microwave received wirelessly into the first baseband signal; and modulating the demodulated first baseband signal into a first high frequency signal and wirelessly transmitting to the outside,
  • the first baseband signal is compressed at a compression rate according to the communication quality of the wireless transmission path through which the microwave is transmitted, and a modulation method according to the communication quality in the wireless transmission path is used.
  • the compressed first baseband signal is modulated into the first microwave.
  • a wireless communication method includes: generating a first baseband signal; and first and second divided baseband signals obtained by dividing the first baseband signal. Modulating the divided baseband signal to a first microwave and wirelessly transmitting; modulating the second divided baseband signal to a second microwave and wirelessly transmitting; and receiving the first microwave received wirelessly Demodulating the first divided baseband signal, demodulating the second microwave received wirelessly to the second divided baseband signal, and combining the first and second divided baseband signals to reproduce Modulating the first baseband signal thus obtained into a first high-frequency signal and wirelessly transmitting the signal to the outside, through a wireless transmission path through which microwaves are transmitted.
  • the first baseband signal or the first and second divided baseband signals are compressed at a compression rate according to quality, and using a modulation scheme according to the communication quality of the wireless transmission path,
  • the compressed first and second divided baseband signals are modulated into the first and second microwaves, respectively.
  • the embodiment it is possible to provide a wireless communication device, a wireless communication system, and a wireless communication method capable of efficient wireless communication according to the communication quality of the wireless transmission path.
  • FIG. 1 is a block diagram showing a wireless communication apparatus according to a first exemplary embodiment.
  • FIG. 3 is a block diagram of a base station apparatus according to a second embodiment. It is a figure which shows the relationship between the compression rate and modulation system of IQ data, and a radio transmission rate. It is a table
  • FIG. 3 is a block diagram illustrating a specific configuration example of a baseband processing device provided in the base station device illustrated in FIG. 2 and a wireless transmission device on the baseband processing device side.
  • FIG. 3 is a block diagram illustrating a specific configuration example of a wireless device provided in the base station device illustrated in FIG.
  • FIG. 10 is a block diagram illustrating a specific configuration example of a baseband processing device provided in the base station device illustrated in FIG. 9 and a wireless transmission device on the baseband processing device side.
  • FIG. 10 is a block diagram illustrating a specific configuration example of a wireless device provided in the base station device illustrated in FIG. 9 and a wireless transmission device on the wireless device side.
  • FIG. 6 is a block diagram illustrating a specific configuration example of a wireless device and a wireless transmission device on a wireless device side provided in a second modification of the base station device illustrated in FIG. 2. It is a figure which shows the structural example of the signal of the Ethernet standard applied in the structure shown in FIG.13 and FIG.14.
  • FIG. 7 is a block diagram of a base station apparatus according to a third embodiment.
  • FIG. 17 is a block diagram showing a first specific configuration example of two radio transmission apparatuses provided on the baseband processing apparatus side of the base station apparatus shown in FIG. 16. It is a block diagram which shows the 2nd specific structural example of the radio transmission apparatus provided in the baseband processing apparatus side of the base station apparatus shown in FIG.
  • FIG. 17 is a block diagram illustrating a third specific configuration example of the radio transmission apparatus provided on the baseband processing apparatus side of the base station apparatus illustrated in FIG. 16.
  • FIG. 6 is a block diagram of a base station apparatus according to a fourth embodiment.
  • FIG. 21 is a block diagram illustrating a specific configuration example of a baseband processing device provided in the base station device illustrated in FIG. 20 and a wireless transmission device on the baseband processing device side.
  • FIG. 21 is a block diagram illustrating a specific configuration example of a radio apparatus provided in the base station apparatus illustrated in FIG. 20 and a radio transmission apparatus on the radio apparatus side.
  • FIG. 21 is a block diagram illustrating a specific configuration example of a baseband processing device and a wireless transmission device on the baseband processing device side in a modification of the base station device illustrated in FIG. 20.
  • FIG. 21 is a block diagram illustrating a specific configuration example of a radio apparatus and a radio transmission apparatus on the radio apparatus side in a modification example of the base station apparatus illustrated in FIG. 20. It is a block diagram which shows the structural example of the base station apparatus which concerns on embodiment.
  • the constituent elements are not necessarily essential unless otherwise specified or apparently essential in principle.
  • the shapes when referring to the shapes, positional relationships, etc. of the components, etc., the shapes are substantially the same unless otherwise specified, or otherwise apparent in principle. And the like are included. The same applies to the above numbers and the like (including the number, numerical value, quantity, range, etc.).
  • FIG. 1 is a block diagram of a base station apparatus (wireless communication apparatus) 10 according to the first embodiment.
  • base station apparatus 10 according to the present embodiment, a baseband signal is compressed at a compression rate corresponding to the communication quality of the wireless transmission path between the baseband processing unit and the wireless unit, and wireless transmission is performed.
  • a desired wireless transmission rate can be maintained, so that efficient wireless communication is possible. This will be specifically described below.
  • the base station apparatus 10 performs wireless communication with a user terminal (not shown).
  • a radio communication system such as C-RAN is configured by the base station apparatus 10 and user terminals.
  • the user terminal is, for example, a mobile terminal such as a mobile phone or a notebook PC.
  • the base station device 10 includes a baseband processing unit 20, a radio unit 30, a first signal radio transmission unit 40 and a first radio transmission unit 40 for wirelessly transferring data between the baseband processing unit 20 and the radio unit 30. 2 signal wireless transmission units 50.
  • the baseband processing unit 20 generates a baseband signal based on data received from a host device (not shown), and then compresses the baseband signal to output a compressed baseband signal.
  • the first signal wireless transmission unit 40 modulates the compressed baseband signal output from the baseband processing unit 20 into a microwave and wirelessly transmits it.
  • the second signal wireless transmission unit 50 wirelessly receives the microwave transmitted from the first signal wireless transmission unit 40.
  • the second signal wireless transmission unit 50 demodulates the wirelessly received microwave into a compressed baseband signal. Then, the second signal radio transmission unit 50 outputs this compressed baseband signal to the radio unit 30.
  • the radio unit 30 decodes the compressed baseband signal output from the second signal radio transmission unit 50, modulates the compressed baseband signal into a high frequency signal, and wirelessly transmits the signal to the outside.
  • the wireless transmission path L1 between the first signal wireless transmission units 40 and 50 uses a high-value modulation method. Wireless transmission is performed. This enables wireless transmission at a wireless transmission rate that is equal to or higher than the required transmission rate of the baseband signal.
  • the baseband processing unit 20 compresses the baseband signal at a compression rate corresponding to the communication quality of the wireless transmission path L1, and outputs a compressed baseband signal.
  • the baseband processing unit 20 compresses the baseband signal by switching from the low magnification to the high magnification compression rate. As a result, even when the communication quality of the wireless transmission path L1 is deteriorated, the wireless transmission rate can be maintained at or higher than the required transmission rate of the baseband signal, so that reliable wireless communication is possible.
  • the baseband processing unit 20 compresses the baseband signal by switching from the high magnification to the low magnification.
  • the baseband signal can be modulated into a microwave by switching from the low-multilevel modulation system to the high-multilevel modulation system, high-quality wireless communication is possible.
  • the radio unit 30 demodulates a high-frequency signal received wirelessly from the outside into a baseband signal, and then compresses the baseband signal to output a compressed baseband signal.
  • the second signal wireless transmission unit 50 modulates the compressed baseband signal output from the wireless unit 30 into a microwave and wirelessly transmits it.
  • the first signal radio transmission unit 40 wirelessly receives the microwave transmitted from the second signal radio transmission unit 50.
  • the first signal wireless transmission unit 40 demodulates the wirelessly received microwave into a compressed baseband signal. Then, the first signal radio transmission unit 40 outputs the compressed baseband signal to the baseband processing unit 20.
  • the baseband processing unit 20 decodes the compressed baseband signal output from the first signal radio transmission unit 40 and performs predetermined processing. For example, the baseband processing unit 20 outputs the processing result to a higher-level device (not shown).
  • the radio unit 30 compresses the baseband signal at a compression rate corresponding to the communication quality of the radio transmission path L1 between the first signal radio transmission units 40 and 50, and outputs the compressed baseband signal.
  • the wireless unit 30 compresses the baseband signal by switching from a low magnification to a high magnification compression rate. As a result, even when the communication quality of the wireless transmission path L1 is deteriorated, the wireless transmission rate can be maintained at or higher than the required transmission rate of the baseband signal, so that reliable wireless communication is possible.
  • the wireless unit 30 compresses the baseband signal by switching from the high magnification to the low magnification compression rate.
  • the baseband signal can be modulated into a microwave by switching from the low-multilevel modulation system to the high-multilevel modulation system, high-quality wireless communication is possible.
  • FIG. 2 is a block diagram of the base station device (wireless communication device) 1 according to the second embodiment.
  • the baseband signal is compressed at a compression rate corresponding to the communication quality of the radio transmission path between the baseband processing apparatus and the radio apparatus, and the communication quality of the radio transmission path
  • the baseband signal after compression is modulated into a microwave by using a modulation method according to the above, and then wirelessly transmitted.
  • a desired wireless transmission rate can be maintained, so that efficient wireless communication is possible. This will be specifically described below.
  • the base station apparatus 1 corresponds to the base station apparatus 10 of FIG. 1 and performs wireless communication with a user terminal (not shown).
  • a radio communication system such as C-RAN is configured by the base station apparatus 1 and user terminals.
  • the user terminal is, for example, a mobile terminal such as a mobile phone or a notebook PC.
  • the base station device 1 includes a baseband processing device (BBU) 2 corresponding to the baseband processing unit 20, a radio device (RRH) 3 corresponding to the radio unit 30, and between the baseband processing device 2 and the radio device 3.
  • BBU baseband processing device
  • RRH radio device
  • the wireless transmission device 4 (corresponding to the first signal wireless transmission unit 40) and the wireless transmission device 5 (corresponding to the second signal wireless transmission unit 50) are provided.
  • the wireless transmission device 4 is provided with an antenna A1
  • the wireless transmission device 5 is provided with an antenna A2
  • the wireless device 3 is provided with an antenna A3.
  • the baseband processing device 2 generates IQ data (baseband signal) based on data received from a host device (not shown).
  • the CPRI standard is adopted for the data interface between the baseband processing device 2 and the wireless device 3. Accordingly, the baseband processing device 2 outputs IQ data of the CPRI standard (hereinafter also referred to as “CPRI signal”) to the wireless transmission device 4.
  • the wireless transmission device 4 modulates IQ data of the CPRI standard supplied from the baseband processing device 2 via an optical cable into a microwave and wirelessly transmits the microwave data via the antenna A1.
  • the wireless transmission device 5 wirelessly receives the microwave transmitted from the wireless transmission device 4 via the antenna A1 via the antenna A2.
  • the wireless transmission device 5 demodulates the wirelessly received microwave into IQ data (baseband signal). Then, the wireless transmission device 5 outputs this CPRI standard IQ data to the wireless device 3.
  • the wireless device 3 modulates the CPRI standard IQ data supplied from the wireless transmission device 5 via the optical cable into a high-frequency signal. This high frequency signal is wirelessly transmitted to the outside via the antenna A3 and received by the user terminal.
  • wireless transmission using a high-level modulation method is performed on the wireless transmission path L1 between the wireless transmission devices 4 and 5. .
  • This enables wireless transmission at a wireless transmission rate that is equal to or higher than the required IQ data transmission rate.
  • wireless transmission using a high multilevel modulation method becomes difficult.
  • the baseband processing device 2 compresses IQ data (baseband signal) at a compression rate corresponding to the communication quality of the wireless transmission path L1, and the wireless transmission device 4 responds to the communication quality of the wireless transmission path L1.
  • the IQ data is modulated into a microwave for wireless transmission using a modulation method.
  • the baseband processing device 2 switches the compression rate from the low magnification to the high magnification and compresses the IQ data.
  • the wireless transmission device 4 switches from the high multilevel to the low multilevel modulation method, and modulates the compressed IQ data into microwaves.
  • a modulation method capable of wireless transmission can be selected and the wireless transmission rate can be maintained higher than the required IQ data transmission rate. Wireless communication is possible.
  • the baseband processing device 2 switches the compression rate from high to low and compresses IQ data.
  • the wireless transmission device 4 switches from the low multi-value to the high multi-value modulation method, and modulates the compressed IQ data into microwaves. Thereby, high-quality wireless communication becomes possible.
  • the wireless device 3 demodulates a high frequency signal wirelessly received from the outside via the antenna A3 into IQ data (baseband signal). Then, the wireless device 3 outputs the CPRI standard IQ data to the wireless transmission device 5.
  • the wireless transmission device 5 modulates IQ data of the CPRI standard supplied from the wireless device 3 via the optical cable into a microwave and wirelessly transmits the microwave data via the antenna A2.
  • the wireless transmission device 4 wirelessly receives the microwave transmitted from the wireless transmission device 5 via the antenna A2 via the antenna A1. Then, the wireless transmission device 4 demodulates the wirelessly received microwave into IQ data (baseband signal). The wireless transmission device 4 then outputs this CPRI standard IQ data to the baseband processing device 2.
  • the baseband processing device 2 executes predetermined processing based on IQ data of the CPRI standard supplied from the wireless transmission device 4 via the optical cable. For example, the baseband processing device 2 outputs the processing result to a higher-level device (not shown).
  • the wireless device 3 compresses IQ data (baseband signal) at a compression rate according to the communication quality of the wireless transmission path L1 between the wireless transmission devices 4 and 5, and the wireless transmission device 5
  • the IQ data is modulated into microwaves using a modulation method corresponding to the communication quality of L1.
  • the wireless device 3 switches the compression rate from low to high and compresses IQ data. Further, the wireless transmission device 5 switches the high multi-value to the low multi-value modulation method, and modulates the compressed IQ data into microwaves. As a result, even when the communication quality of the wireless transmission path L1 deteriorates, a modulation scheme capable of wireless transmission can be selected and a wireless transmission rate higher than the required IQ data transmission rate can be maintained. Wireless communication is possible.
  • the wireless device 3 compresses the IQ data by switching from a high magnification to a low magnification.
  • the wireless transmission device 5 switches the low-multilevel to the high-multilevel modulation method, and modulates the compressed IQ data into microwaves. Thereby, high-quality wireless communication becomes possible.
  • a difference may be provided between the communication quality level (threshold) when switching the compression rate and the communication quality level (threshold) when switching the modulation method.
  • the modulation method is switched from the low multivalue to the high multivalue, and then the compression rate is switched from the high magnification to the low magnification.
  • the communication quality of the wireless transmission path L1 deteriorates, first, the compression rate is switched from low to high, and then the modulation method is switched from high to low.
  • FIG. 3 is a diagram showing the relationship between the compression rate and modulation method of IQ data and the wireless transmission rate.
  • FIG. 4 is a table corresponding to the diagram shown in FIG. Referring to FIGS. 3 and 4, the radio transmission rate increases as the modulation scheme becomes higher and lower as the modulation scheme becomes lower. In addition, the wireless transmission rate decreases as the compression rate decreases, and increases as the compression rate increases.
  • the modulation method is preferably as high as possible and the compression rate is preferably as low as possible.
  • the highest multi-level modulation method capable of communicating under the communication quality of the wireless transmission path L1 is adopted, and in this case, the compression ratio of the minimum magnification is set such that the wireless transmission rate is equal to or higher than the IQ data rate. Preferably it is selected.
  • a compression ratio of 1 is selected.
  • a compression ratio of 1.5 is selected.
  • a compression ratio of 2 is selected.
  • the QPSK modulation method is employed, a compression ratio of 3.5 times is selected.
  • the base station apparatus 1 switches the IQ data compression rate and the compressed IQ data modulation scheme according to the communication quality of the wireless transmission path L1, thereby enabling efficient wireless communication. Is possible.
  • the IQ data is compressed not in the wireless transmission apparatuses 4 and 5 but in the baseband processing apparatus 2 and the wireless apparatus 3, respectively. Accordingly, the CPRI signal propagating through the optical cable between the baseband processing device 2 and the radio transmission device 4 is compressed, and the CPRI signal propagating through the optical cable between the radio device 3 and the radio transmission device 5 is compressed.
  • the power consumed in each optical cable can be reduced by lowering the option of the standard.
  • IQ data is compressed in the baseband processing device 2, so that the plurality of wireless transmission devices 4.
  • the IQ data compression can be centrally managed and the number of devices for compressing IQ data can be reduced.
  • each IO data compression unit is configured to perform irreversible compression from the viewpoint of compression efficiency and ease of compression.
  • irreversible compression for example, Fast Fourier Transform (FFT) is adopted.
  • FFT Fast Fourier Transform
  • Lossy compression has an advantage that transmission delay due to compression processing is less than lossless compression.
  • each IO data compression unit may be configured to perform lossless compression as long as a certain compression efficiency is desired.
  • a lossless compression method predictive coding, run length, etc.
  • the structure which performs irreversible compression and the structure which performs lossless compression may be switched according to a modulation system. The same can be said for the third and fourth embodiments described below.
  • FIG. 5 is a block diagram illustrating a specific configuration example of the baseband processing device 2 and the wireless transmission device 4 provided on the baseband processing device 2 side.
  • FIG. 6 is a block diagram illustrating a specific configuration example of the wireless device 3 and the wireless transmission device 5 provided on the wireless device 3 side.
  • the baseband processing device 2 includes a baseband signal generation unit 200, an IQ data compression unit 201, a CPRI signal transmission unit 202, a CPRI signal reception unit 203, and an IQ data decoding unit 204.
  • the wireless transmission device 4 includes a CPRI signal reception unit 401, an OVH multiplexing unit 402, a wireless transmission unit 403, a wireless reception unit 404, a requested compression rate determination unit 405, an OVH extraction unit 406, and a CPRI signal transmission unit 407. And comprising.
  • the wireless transmission device 5 includes a wireless reception unit 501, a required compression rate determination unit 502, an OVH extraction unit 503, a CPRI signal transmission unit 504, a CPRI signal reception unit 505, an OVH multiplexing unit 506, and a wireless transmission unit 507. And comprising.
  • the wireless device 3 includes a CPRI signal reception unit 301, an IQ data decoding unit 302, a wireless transmission unit 303, a wireless reception unit 304, an IQ data compression unit 305, and a CPRI signal transmission unit 306.
  • the baseband signal generation unit 200 generates IQ data (baseband signal) D1 based on data received from a host device (not shown).
  • the IQ data compression unit 201 is a compression rate according to the communication quality of the wireless transmission path L1 (in this example, the compression rate of the compression rate information RQ1 received by the CPRI signal receiving unit 203 and requested from the wireless device 3 side) RQ1.
  • the IQ data D1 is compressed.
  • the IQ data compression unit 201 compresses the IQ data D1 by switching from a low magnification to a high magnification compression rate.
  • the IQ data compression unit 201 compresses the IQ data D1 by switching from a high magnification to a low magnification (details will be described later).
  • the CPRI signal transmission unit 202 transmits the compressed IQ data D1 and the compression rate information RQ1 after converting the data so as to satisfy the CPRI standard.
  • FIG. 7 is a diagram showing a frame format of a CPRI standard signal.
  • a CPRI standard signal is provided with a Vendor specific area where IQ data is not transmitted and received at regular intervals. Using this Vendor custom-specific area, IQ data compression rate information and compression requests are transmitted and received.
  • the CPRI signal receiving unit 401 receives the CPRI standard IQ data D1 (including the compression rate information RQ1) supplied from the CPRI signal transmitting unit 202 of the baseband processing device 2 via the optical cable.
  • the required compression rate determination unit 405 is configured on the wireless device 3 side.
  • the compression rate of the IQ data D2 before being modulated by the microwave MW2 is determined and output as new compression rate information RQ2.
  • the requested compression rate determination unit 405 compresses the IQ data D2 newly transmitted from the wireless device 3 side. Increase On the other hand, when the communication quality of the wireless transmission path L1 is improved and the CN noise ratio of the microwave MW2 is increased, the requested compression rate determination unit 405 compresses the IQ data D2 newly transmitted from the wireless device 3 side. Make it smaller.
  • OVH multiplexing section 402 multiplexes compressed IQ data D1 (including compression ratio information RQ1) and new compression ratio information RQ2 for IQ data D2.
  • the wireless transmission unit 403 modulates the data (baseband signal) multiplexed by the OVH multiplexing unit 402 into the microwave MW1 and wirelessly transmits it via the antenna A1.
  • FIG. 8 is a diagram showing a frame format of a radio signal transmitted and received between the radio transmission apparatuses 4 and 5.
  • the radio signal is provided with an overhead area (OVH area) before an area where IQ data is transmitted and received.
  • OVH area overhead area
  • compression rate information of IQ data and a compression request are transmitted and received.
  • the wireless transmission unit 403 uses the modulation method according to the communication quality of the wireless transmission path L1 (in other words, the compression rate RQ1 of the IQ data D1) to convert the data multiplexed by the OVH multiplexing unit 402 into the microwave. Modulate to MW1.
  • the wireless transmission unit 403 switches from a high multivalue to a low multivalue modulation method.
  • the compressed IQ data D1 is modulated into the microwave MW1.
  • the wireless transmission unit 403 switches from the low multi-value modulation method to the high multi-value modulation method.
  • the compressed IQ data D1 is modulated into the microwave MW1.
  • the wireless reception unit 501 wirelessly receives the microwave MW1 wirelessly transmitted from the wireless transmission device 4 via the antenna A1 via the antenna A2. Then, the wireless reception unit 501 demodulates the wirelessly received microwave MW1 into a baseband signal.
  • the OVH extraction unit 503 extracts the compressed IQ data D1 and its compression rate information RQ1 and the compression rate information RQ2 of the IQ data D2 from the baseband signal demodulated by the radio reception unit 501.
  • the CPRI signal transmission unit 504 converts the compressed IQ data D1 and its compression rate information RQ1 and the compression rate information RQ2 of the IQ data D2 so as to satisfy the CPRI standard and transmits the converted data.
  • the CPRI signal receiving unit 301 receives IQ data D1 (including compression rate information RQ1 and RQ2) of the CPRI standard supplied from the CPRI signal transmitting unit 504 of the wireless transmission device 5 via the optical cable.
  • the IQ data decoding unit 302 decodes the compressed IQ data D1 based on the compression rate information RQ1.
  • the wireless transmission unit 303 modulates the IQ data D1 decoded by the IQ data decoding unit 302 into a high frequency signal RF1.
  • the high-frequency signal RF1 is wirelessly transmitted to the outside via the antenna A3 and received by the user terminal.
  • the wireless reception unit 304 demodulates the high frequency signal RF1 wirelessly received from the outside via the antenna A3 into IQ data (baseband signal) D2.
  • the IQ data compression unit 305 is a compression rate according to the communication quality of the wireless transmission path L1 (in this example, the compression rate of the compression rate information RQ2 received by the CPRI signal reception unit 301 and requested from the baseband processing device 2 side) )
  • the IQ data D2 is compressed with RQ2.
  • the IQ data compression unit 305 switches the compression rate from the low magnification to the high magnification and compresses the IQ data D2.
  • the IQ data compression unit 305 switches the compression rate from high to low and compresses the IQ data D2.
  • the CPRI signal transmission unit 306 converts the compressed IQ data D2 and the compression rate information RQ2 so as to satisfy the CPRI standard and transmits the converted data.
  • the CPRI signal reception unit 505 receives the CPRI standard IQ data D2 (including the compression rate information RQ2) supplied from the CPRI signal transmission unit 306 of the wireless device 3 via the optical cable.
  • the required compression rate determination unit 502 is based on the CN noise ratio of the microwave MW1 wirelessly received by the wireless reception unit 501, which is one of the indexes representing the communication quality of the wireless transmission path L1. On the side, the compression rate of the IQ data D1 before being modulated to the microwave MW1 is determined and output as new compression rate information RQ1.
  • the required compression rate determination unit 502 performs processing for IQ data D1 newly transmitted from the baseband processing device 2 side. Increase the compression ratio.
  • the requested compression rate determination unit 502 performs the processing for the IQ data D1 newly transmitted from the baseband processing device 2 side. Reduce the compression rate.
  • the OVH multiplexing unit 506 multiplexes the compressed IQ data D2 (including the compression rate information RQ2) and the new compression rate information RQ1 for the IQ data D1.
  • the wireless transmission unit 507 modulates the data (baseband signal) multiplexed by the OVH multiplexing unit 506 into the microwave MW2 and wirelessly transmits it via the antenna A2.
  • the wireless transmission unit 507 uses the modulation scheme corresponding to the communication quality of the wireless transmission path L1 (in other words, the compression rate DQ2 of the IQ data D2) to microwave the data multiplexed by the OVH multiplexing unit 506. Modulate to MW2.
  • the wireless transmission unit 507 switches from a high-multilevel modulation scheme to a low-multilevel modulation scheme.
  • the compressed IQ data D2 is modulated into the microwave MW2.
  • the wireless transmission unit 507 switches from a low multi-value modulation method to a high multi-value modulation method.
  • the compressed IQ data D2 is modulated into the microwave MW2.
  • the wireless reception unit 404 wirelessly receives the microwave MW2 wirelessly transmitted from the wireless transmission device 5 via the antenna A2 via the antenna A1.
  • the wireless reception unit 404 demodulates the wirelessly received microwave MW1 into a baseband signal.
  • the OVH extraction unit 406 extracts the compressed IQ data D2 and its compression rate information RQ2 and the compression rate information RQ1 of the IQ data D1 from the baseband signal demodulated by the radio reception unit 404.
  • the CPRI signal transmission unit 407 converts the compressed IQ data D2 and its compression rate information RQ2 and the compression rate information RQ1 of the IQ data D1 after converting them so as to satisfy the CPRI standard.
  • the CPRI signal receiving unit 203 receives the CPRI standard IQ data D2 (including compression rate information RQ1 and RQ2) supplied from the CPRI signal transmitting unit 407 of the wireless transmission device 4 via the optical cable. .
  • the IQ data decoding unit 204 decodes the compressed IQ data D2 based on the compression rate information RQ2.
  • the baseband signal generation unit 200 performs a predetermined process based on the IQ data D2 decoded by the IQ data decoding unit 204. For example, the baseband processing device 2 outputs the processing result to a higher-level device (not shown).
  • the specific configuration of the base station apparatus 1 shown in FIGS. 5 and 6 is merely an example, and can be appropriately changed to another configuration having an equivalent function.
  • the CN noise ratio of the microwaves MW1 and MW2 is used as one of the indexes indicating the communication quality of the wireless transmission path L1 has been described as an example.
  • the present invention is not limited to this, and the microwave MW1 , MW2 field strength may be used. The same can be said for the third and fourth embodiments described below.
  • FIG. 9 is a block diagram illustrating a first modification of the base station device 1 as the base station device 1a.
  • the base station apparatus 1a includes a baseband processing apparatus (BBU) 2a, a radio apparatus (RRH) 3a, and radio transmission apparatuses 4a and 5a.
  • BBU baseband processing apparatus
  • RRH radio apparatus
  • the baseband processing device 2a, the wireless device 3a, and the wireless transmission devices 4a and 5a in the base station device 1a correspond to the baseband processing device 2, the wireless device 3, and the wireless transmission devices 4 and 5 in the base station device 1, respectively. To do.
  • CPRI signal CPRI standard signal
  • ETH signals trademark
  • FIG. 10 is a block diagram illustrating a specific configuration example of the baseband processing device 2a and the wireless transmission device 4a.
  • FIG. 11 is a block diagram illustrating a specific configuration example of the wireless device 3a and the wireless transmission device 5a.
  • the baseband processing device 2a replaces the CPRI signal transmission unit 202 and the CPRI signal reception unit 203 with an ETH signal transmission unit 205, a compression rate information packet generation unit 206, and an ETH signal.
  • a receiving unit 207 is provided.
  • the wireless transmission device 4a replaces the CPRI signal reception unit 401 and the CPRI signal transmission unit 407 with an ETH signal reception unit 408, an ETH signal transmission unit 409, and a compression rate information packet generation unit. 410.
  • the wireless transmission device 5a replaces the CPRI signal transmission unit 504 and the CPRI signal reception unit 505 with an ETH signal transmission unit 508, a compression rate information packet generation unit 509, and an ETH signal reception unit. 510.
  • the wireless device 3a replaces the CPRI signal receiving unit 301 and the CPRI signal transmitting unit 306 with an ETH signal receiving unit 307, a compression rate information packet extracting unit 308, an ETH signal transmitting unit 309, and A compression rate information packet generator 310 is provided.
  • the transmission path of the base station apparatus 1a will be described. Below, a different point from the base station apparatus 1 is mainly demonstrated.
  • the compression rate information packet generation unit 206 converts the compression rate information RQ1 of the IQ data D1 compressed by the IQ data compression unit 201 into an Ethernet standard packet.
  • the ETH signal transmission unit 205 converts the IQ data D1 compressed by the IQ data compression unit 201 into an Ethernet standard packet and transmits the packet at a constant interval, and in a section where the packet of the IQ data D1 is not transmitted, Information RQ1 and a compression request packet are transmitted.
  • FIG. 12 is a diagram illustrating a configuration example of a signal of the Ethernet standard adopted in the base station apparatus 1a.
  • packets of compressed IQ data are transmitted and received with a period T and a packet length L (L ⁇ T). Thereby, it is possible to transmit and receive IQ data which is continuous data.
  • the compression rate information and the compression request packet are transmitted and received in a section where the compressed IQ data packet is not transmitted and received.
  • the ETH signal reception unit 408 receives the packets of the Ethernet standard IQ data D1 and the compression rate information RQ1 transmitted from the ETH signal transmission unit 205 of the baseband processing device 2a.
  • the reception result of the ETH signal receiving unit 408 is supplied to the OVH multiplexing unit 402.
  • the compression rate information packet generation unit 509 converts the compression rate information RQ1 of the compressed IQ data D1 extracted by the OVH extraction unit 503 and the compression rate information RQ2 for the IQ data D2 into the Ethernet standard packet. Convert to The ETH signal transmission unit 508 converts the compressed IQ data D1 extracted by the OVH extraction unit 503 into an Ethernet standard packet and transmits it at a constant interval, and in a section where the IQ data D1 packet is not transmitted, The compression rate information RQ1, RQ2 and a compression request packet are transmitted.
  • the ETH signal receiving unit 307 receives the packet of the Ethernet standard IQ data D1 (including compression rate information RQ1 and RQ2) transmitted from the ETH signal transmitting unit 508 of the wireless transmission device 5a.
  • the IQ data D1 received by the ETH signal receiving unit 307 and the compression rate information RQ1 are supplied to the IQ data decoding unit 302 provided in the subsequent stage.
  • the compression rate information packet extraction unit 308 extracts the packet of the compression rate information RQ2 for the IQ data D2 from the data packets received by the ETH signal reception unit 307.
  • the compression rate information RQ2 extracted by the compression rate information packet extraction unit 308 is supplied to the IQ data compression unit 305 provided on the reception path.
  • the compression rate information packet generation unit 310 converts the compression rate information RQ2 of the IQ data D2 compressed by the IQ data compression unit 305 into an Ethernet standard packet.
  • the ETH signal transmission unit 309 converts the IQ data D2 compressed by the IQ data compression unit 305 into an Ethernet standard packet and transmits the packet at a constant interval, and in a section where the IQ data D2 packet is not transmitted, Information RQ2 and a compression request packet are transmitted.
  • the ETH signal reception unit 510 receives the packets of the Ethernet standard IQ data D2 and the compression rate information RQ2 transmitted from the ETH signal transmission unit 309. The reception result of the ETH signal receiving unit 510 is supplied to the OVH multiplexing unit 506.
  • the compression rate information packet generation unit 410 converts the compression rate information RQ2 of the compressed IQ data D2 extracted by the OVH extraction unit 406 and the compression rate information RQ1 for the IQ data D1 into an Ethernet standard packet. Convert to The ETH signal transmission unit 409 converts the compressed IQ data D2 extracted by the OVH extraction unit 406 into an Ethernet standard packet and transmits it at a constant interval, and in a section in which the IQ data D2 packet is not transmitted, The compression rate information RQ1, RQ2 and a compression request packet are transmitted.
  • the ETH signal receiving unit 207 receives a packet of Ethernet standard IQ data D2 (including compression rate information RQ1, RQ2) transmitted from the ETH signal transmitting unit 409 of the wireless transmission device 4a.
  • the IQ data D2 received by the ETH signal receiving unit 207 and its compression rate information RQ2 are supplied to the IQ data decoding unit 204 provided in the subsequent stage.
  • the compression rate information packet extraction unit 208 extracts the packet of the compression rate information RQ1 for the IQ data D1 from the data packets received by the ETH signal reception unit 207.
  • the compression rate information RQ1 extracted by the compression rate information packet extraction unit 208 is supplied to the IQ data compression unit 201 provided on the transmission path.
  • a base station device 1b as a second modification of the base station device 1 includes a baseband processing device 2b, a wireless device 3b, and wireless transmission devices 4b and 5b. Note that the baseband processing device 2b, the wireless device 3b, and the wireless transmission devices 4b and 5b in the base station device 1b correspond to the baseband processing device 2, the wireless device 3, and the wireless transmission devices 4 and 5 in the base station device 1, respectively. To do.
  • Ethernet is used for data transfer between the baseband processing device 2b and the radio transmission device 4b and data transfer between the radio transmission device 5b and the radio device 3b.
  • Standard signals are used.
  • FIG. 13 is a block diagram illustrating a specific configuration example of the baseband processing device 2b and the wireless transmission device 4b.
  • FIG. 14 is a block diagram illustrating a specific configuration example of the wireless device 3b and the wireless transmission device 5b.
  • the baseband processing device 2b includes a compression rate information extraction unit 209 instead of including the compression rate information packet generation unit 206 and the compression rate information packet extraction unit 208.
  • the wireless transmission device 4b does not include the compression rate information packet generation unit 410 as compared with the wireless transmission device 4a.
  • the wireless transmission device 5b does not include the compression rate information packet generation unit 509 as compared with the wireless transmission device 5b.
  • the wireless device 3b includes a compression rate information extraction unit 311 instead of including the compression rate information packet extraction unit 308 and the compression rate information packet generation unit 310.
  • the ETH signal transmission unit 205 converts the IQ data D1 compressed by the IQ data compression unit 201 and the compression rate information RQ1 into a single packet of the Ethernet standard and transmits it at regular intervals.
  • FIG. 15 is a diagram illustrating a configuration example of a signal of the Ethernet standard adopted in the base station apparatus 1b.
  • the compression rate information and the compression request stored in the OVH area are transmitted and received as a single packet at regular intervals.
  • the ETH signal reception unit 408 receives the packet of the Ethernet standard IQ data D1 and the compression rate information RQ1 transmitted from the ETH signal transmission unit 205 of the wireless transmission device 4b.
  • the reception result of the ETH signal receiving unit 408 is supplied to the OVH multiplexing unit 402.
  • the ETH signal transmission unit 508 converts the compressed IQ data D1 extracted by the OVH extraction unit 503, the compression rate information RQ1, and the compression rate information RQ2 for the IQ data D2 into a single unit of the Ethernet standard. Are converted into packets and sent at regular intervals.
  • the ETH signal receiving unit 307 receives the packet of the Ethernet standard IQ data D1 (including compression rate information RQ1 and RQ2) transmitted from the ETH signal transmitting unit 508 of the wireless transmission device 5b.
  • the IQ data D1 received by the ETH signal receiving unit 307 and the compression rate information RQ1 are supplied to the IQ data decoding unit 302 provided in the subsequent stage.
  • the compression rate information extraction unit 311 extracts the compression rate information RQ2 for the IQ data D2 from the OVH region of the data packet received by the ETH signal reception unit 307.
  • the compression rate information RQ2 extracted by the compression rate information extraction unit 311 is supplied to the IQ data compression unit 305 provided on the reception path.
  • the ETH signal transmission unit 309 converts the IQ data D2 compressed by the IQ data compression unit 305 and its compression rate information RQ2 into a single packet of the Ethernet standard and transmits the packet at regular intervals.
  • the ETH signal reception unit 510 receives the Ethernet standard IQ data D2 and the compression rate information RQ2 packet transmitted from the ETH signal transmission unit 309 of the wireless device 3b.
  • the reception result of the ETH signal receiving unit 510 is supplied to the OVH multiplexing unit 506.
  • the ETH signal transmission unit 409 converts the compressed IQ data D2 extracted by the OVH extraction unit 406, the compression rate information RQ2, and the compression rate information RQ1 for the IQ data D1 into a single unit of the Ethernet standard. Are converted into packets and sent at regular intervals.
  • the ETH signal receiving unit 207 receives a packet of Ethernet standard IQ data D2 (including compression rate information RQ1 and RQ2) transmitted from the ETH signal transmitting unit 409 of the wireless transmission device 4b.
  • the IQ data D2 received by the ETH signal receiving unit 207 and its compression rate information RQ2 are supplied to the IQ data decoding unit 204 provided in the subsequent stage.
  • the compression rate information extraction unit 209 extracts the compression rate information RQ1 for the IQ data D1 from the OVH area of the data packet received by the ETH signal reception unit 207.
  • the compression rate information RQ1 extracted by the compression rate information extraction unit 209 is supplied to the IQ data compression unit 201 provided on the transmission path.
  • FIG. 16 is a block diagram of the base station device 1c according to the third embodiment.
  • the base station device 1 c includes two sets of wireless transmission devices between the baseband processing device 2 and the wireless device 3 as compared with the base station device 1. This will be specifically described below.
  • the base station device 1c wirelessly transfers data between the baseband processing device (BBU) 2, the wireless device (RRH) 3, and the baseband processing device 2 and the wireless device 3.
  • Wireless transmission devices 41c and 42c and wireless transmission devices 51c and 52c for performing are provided.
  • the wireless transmission devices 41c and 42c are provided with antennas A11 and A12
  • the wireless transmission devices 51c and 52c are provided with antennas A21 and A22, respectively
  • the wireless device 3 is provided with an antenna A3. That is, the base station apparatus 1c has a so-called RTA (Radio Traffic Aggregation) configuration.
  • RTA Radio Traffic Aggregation
  • a combination of the wireless transmission devices 41 c and 42 c corresponds to the wireless transmission device 4, and a combination of the wireless transmission devices 51 c and 52 c corresponds to the wireless transmission device 5.
  • the combination of antennas A11 and A12 corresponds to antenna A1
  • the combination of antennas A21 and A22 corresponds to antenna A2.
  • FIG. 17 is a block diagram illustrating a first specific configuration example of the wireless transmission devices 41c and 42c provided on the baseband processing device 2 side.
  • the wireless transmission device 41c includes a CPRI signal reception unit 411, a CPRI signal distribution unit 412, an OVH multiplexing unit 414, a wireless transmission unit 415, a wireless reception unit 416, a requested compression rate determination unit 417, and an OVH extraction unit. 418, a CPRI signal assembly unit 420 and a CPRI signal transmission unit 421 are provided.
  • the wireless transmission device 42 c includes a CPRI signal reception unit 422, an OVH multiplexing unit 424, a wireless transmission unit 425, a wireless reception unit 426, a requested compression rate determination unit 427, an OVH extraction unit 428, and a CPRI signal transmission unit 430.
  • the CPRI signal reception unit 411, the OVH multiplexing unit 414, the wireless transmission unit 415, the wireless reception unit 416, the requested compression rate determination unit 417, the OVH extraction unit 418, and the CPRI signal transmission unit 421 are respectively a CPRI signal reception unit 401, This corresponds to the OVH multiplexing unit 402, the wireless transmission unit 403, the wireless reception unit 404, the requested compression rate determination unit 405, the OVH extraction unit 406, and the CPRI signal transmission unit 407.
  • the CPRI signal receiving unit 422, the OVH multiplexing unit 424, the wireless transmission unit 425, the wireless reception unit 426, the request compression rate determination unit 427, the OVH extraction unit 428, and the CPRI signal transmission unit 430 are respectively connected to the CPRI signal reception unit 401, This corresponds to the OVH multiplexing unit 402, the wireless transmission unit 403, the wireless reception unit 404, the requested compression rate determination unit 405, the OVH extraction unit 406, and the CPRI signal transmission unit 407.
  • the wireless transmission device 41 c further includes a CPRI signal distribution unit 412 and a CPRI signal assembly unit 420 as compared with the wireless transmission device 4.
  • Other configurations of the wireless transmission device 41 c are the same as those of the wireless transmission device 4.
  • the wireless transmission device 42 c has the same configuration as the wireless transmission device 4.
  • the CPRI signal distribution unit 412 is provided on a transmission path between the CPRI signal reception unit 411 and the OVH multiplexing unit 414, and two CPRI signals from the baseband processing device 2 received by the CPRI signal reception unit 411 are provided. Divide (sort). Therefore, one of the signals distributed by the CPRI signal distribution unit 412 is wirelessly transmitted via the wireless transmission path L11 between the wireless transmission devices 41c and 51c, and the other of the signals distributed by the CPRI signal distribution unit 412 is The wireless transmission is performed via the wireless transmission path L12 between the wireless transmission devices 42c and 52c.
  • the CPRI signal assembling unit 420 is provided on the reception path between the OVH extraction unit 418 and the CPRI signal transmission unit 421, and combines the extraction results of the OVH extraction units 418 and 428 and outputs the result to the CPRI signal transmission unit 421. To do.
  • the OVH extraction unit 418 includes the compressed IQ data D21 (data wirelessly received via the wireless transmission path L11) and its compression rate information RQ21, and the IQ data D11 (through the wireless transmission path L11). And compression rate information RQ11 for the data scheduled to be wirelessly transmitted).
  • the OVH extraction unit 428 includes the compressed IQ data D22 (data wirelessly received via the wireless transmission line L12) and its compression rate information RQ22, and the IQ data D12 (wirelessly received via the wireless transmission line L12). Compression rate information RQ12 for (data).
  • the CPRI signal assembling unit 420 combines the extraction results of the OVH extraction units 418 and 428 and outputs the compressed IQ data D2, its compression rate information RQ2, and the compression rate information RQ1 for the IQ data D1.
  • the configurations and operations of the wireless transmission devices 51c and 52c are the same as those of the wireless transmission device 5 except that a CPRI signal distribution unit is provided on the transmission path and a CPRI signal assembly unit is provided on the reception path. Therefore, the description thereof is omitted.
  • the base station device 1c divides IQ data into two signal components and performs wireless transmission via the two wireless transmission paths L11 and L12 formed between the two sets of wireless transmission devices.
  • wireless transmission of IQ data at a more reliable transmission rate can be realized.
  • the case where the CPRI standard is adopted as the data interface between the baseband processing device 2 and the wireless device 3 has been described as an example.
  • the present invention is not limited to this, and the Ethernet standard may be adopted, for example.
  • the configuration when the Ethernet standard is adopted may be referred to the configurations of FIGS. 9 to 12, and the description thereof is omitted.
  • FIG. 18 is a block diagram illustrating a second specific configuration example of the wireless transmission devices 41c and 42c as the wireless transmission devices 41d and 42d.
  • the baseband processing device 2d, the wireless device 3d, and the wireless transmission devices 51d and 52d constitute a base station device 1d corresponding to the base station device 1c.
  • the baseband processing device 2d does not have the IQ data compression unit 201 and the IQ data decoding unit 204 as compared with the baseband processing device 2, but the wireless transmission device 41d compares with the wireless transmission device 41c.
  • the CPRI signal compression unit 413 and the CPRI signal restoration unit 419 are further provided, and the wireless transmission device 42d further includes the CPRI signal compression unit 423 and the CPRI signal restoration unit 429 as compared with the wireless transmission device 42c.
  • the CPRI signal compression unit 413 is provided on the transmission path between the CPRI signal reception unit 411 and the OVH multiplexing unit 414. Then, the CPRI signal compressing unit 413 extracts one of the CPRI signals distributed by the CPRI signal receiving unit 411 by the compression rate according to the communication quality of the wireless transmission path L11 (in this example, the OVH extracting unit 418 extracts the wireless (Compression rate of compression rate information RQ11 requested from the apparatus 3 side) RQ11 is used for compression.
  • the CPRI signal compression unit 423 is provided on the transmission path between the CPRI signal reception unit 422 and the OVH multiplexing unit 424. Then, the CPRI signal compression unit 423 extracts the other of the CPRI signals distributed by the CPRI signal reception unit 411 by the compression rate (in this example, the OVH extraction unit 428) according to the communication quality of the wireless transmission line L12, Compression is performed with the compression ratio RQ12 (compression ratio of the compression ratio information RQ12 requested from the apparatus 3 side).
  • the IQ data modulation method and compression rate can be set independently of each other.
  • the CPRI signal distribution unit 412 distributes the CPRI signal component having a high priority to the radio transmission path side adopting the high-multilevel modulation method, and the CPRI signal component having a low priority is low
  • the value is distributed to the wireless transmission line that uses the value modulation method. This enables high-quality wireless transmission of a CPRI signal component with a high priority, and more reliable wireless transmission with a poor quality of a CPRI signal component with a low priority.
  • the CPRI signal restoration unit 419 is provided on the reception path between the OVH extraction unit 418 and the CPRI signal assembly unit 420, and the compressed IQ data D21 extracted by the OVH extraction unit 418 is used. Similarly, restoration is performed based on the compression rate information RQ21 extracted by the OVH extraction unit 418.
  • the CPRI signal restoration unit 429 is provided on the reception path between the OVH extraction unit 428 and the CPRI signal transmission unit 430, and the compressed IQ data D22 extracted by the OVH extraction unit 428 is Similarly, restoration is performed based on the compression rate information RQ22 extracted by the OVH extraction unit 428.
  • the CPRI signal assembling unit 420 combines the IQ data D21 restored by the CPRI signal restoring unit 419 and the IQ data D22 restored by the CPRI signal restoring unit 429, and outputs the synthesized IQ data D2.
  • the CPRI signal assembling unit 420 also synthesizes the compression rate information RQ11 and RQ12 for the IQ data D11 and D12.
  • the wireless transmission devices 41d and 42d are the same as those of the wireless transmission devices 41c and 42c, description thereof is omitted.
  • the configurations and operations of the wireless transmission devices 51d and 52d are the same as the wireless transmission devices 51c, 51c except that a CPRI signal compression unit is provided on the transmission path and a CPRI signal decoding unit is provided on the reception path. Since it is the same as 52c, its description is omitted. Accordingly, the wireless device 3d does not include the IQ data compression unit 305 and the IQ data decoding unit 302.
  • the base station apparatus 1d can achieve the same effects as the base station apparatus 1c, and can divide IQ data into two signal components and perform wireless transmission with different modulation schemes and compression rates, respectively. Can do. Thereby, for example, high-quality wireless transmission of a high-priority CPRI signal component can be performed, and more reliable wireless transmission can be performed although the quality of a low-priority CPRI signal component is inferior.
  • FIG. 19 is a block diagram illustrating a third specific configuration example of the wireless transmission devices 41c and 42c as the wireless transmission devices 41e and 42e.
  • the baseband processing device 2d, the wireless device 3d, and the wireless transmission devices 51e and 52e constitute a base station device 1e corresponding to the base station device 1c.
  • the baseband processing device 2e does not have the IQ data compression unit 201 and the IQ data decoding unit 204 as compared with the baseband processing device 2, but the wireless transmission device 41e compares with the wireless transmission device 41c.
  • the CPRI signal compression unit 413 and the CPRI signal restoration unit 419 are further provided.
  • the context of the OVH multiplexing unit 414 and the CPRI signal receiving unit 411 is reversed, and the context of the CPRI signal assembling unit 420 and the OVH extraction unit 418 is reversed.
  • the wireless transmission device 42e does not include the OVH multiplexing unit 424 and the OVH extraction unit 428 as compared with the wireless transmission device 42c.
  • the CPRI signal compression unit 413 provided only in the wireless transmission device 41e compresses the CPRI signal before the distribution, and the CPRI signal restoration unit 419 provided only in the wireless transmission device 41e performs synthesis ( The CPRI signal after assembly is restored.
  • the CPRI signal distribution unit is provided on the transmission path of the wireless transmission device 51e
  • the CPRI signal assembly unit is provided on the reception path of the wireless transmission device 51e. Basically, both are the same as those of the wireless transmission device 5, and the description thereof is omitted.
  • the base station device 1e can achieve the same effects as the base station device 1c.
  • FIG. 20 is a block diagram of a base station device (wireless communication device) 1f according to the fourth embodiment.
  • the base station device 1f includes a baseband processing device 2f, a wireless device 3f, wireless transmission devices 41f and 42f, and wireless transmission devices 51f and 52f.
  • the wireless transmission devices 41f and 42f are provided with antennas A11 and A12
  • the wireless transmission devices 51f and 52f are provided with antennas A21 and A22, respectively
  • the wireless device 3f is provided with an antenna A3.
  • the base station device 1f has a so-called LAG (Link Aggregation) configuration.
  • FIG. 21 is a block diagram illustrating a specific configuration example of the baseband processing device 2f and the wireless transmission devices 41f and 42f.
  • FIG. 22 is a block diagram illustrating a specific configuration example of the wireless device 3f and the wireless transmission devices 51f and 52f.
  • the baseband processing device 2f includes a baseband signal generation unit 200f, IQ data compression units 2011 and 2012, CPRI signal transmission units 2021 and 2022, CPRI signal reception units 2031 and 2032, IQ data decoding units 2041 and 2042, and , Compression rate information etc. extraction units 2101 and 2102.
  • the baseband processing device 2 f has a double configuration of the baseband processing device 2 other than the baseband signal generation unit 200.
  • the baseband signal generation unit 200f includes a QoS control unit 211, a distribution OVH multiplexing unit 231, 234, an IQ data generation unit 213, 223, and a network (NW) data generation unit 220, 230.
  • the wireless transmission device 41f includes a CPRI signal reception unit 4011, an OVH multiplexing unit 4021, a wireless transmission unit 4031, a wireless reception unit 4041, a required compression rate determination unit 4051, an OVH extraction unit 4061, and a CPRI signal transmission unit 4071.
  • the wireless transmission device 42f includes a CPRI signal reception unit 4012, an OVH multiplexing unit 4022, a wireless transmission unit 4032, a wireless reception unit 4042, a required compression rate determination unit 4052, an OVH extraction unit 4062, and a CPRI signal transmission unit 4072.
  • the wireless transmission devices 41 f and 42 f both have the same configuration and operation as the wireless transmission device 4.
  • the wireless device 3f includes a CPRI signal reception unit 3011 and 3012, an IQ data decoding unit 3021 and 3022, a wireless transmission unit 303, a wireless reception unit 304, an IQ data compression unit 3051 and 3052, and a CPRI signal transmission unit 3061. 3062, a distribution OVH extraction unit 312, and an IQ data distribution unit 313.
  • the wireless device 3 f has a double configuration of the wireless device 3.
  • the wireless transmission unit 303 and the wireless reception unit 304 are both shared by a double configuration.
  • the wireless transmission device 51f includes a wireless reception unit 5011, a required compression rate determination unit 5021, an OVH extraction unit 5031, a CPRI signal transmission unit 5041, a CPRI signal reception unit 5051, an OVH multiplexing unit 5061, and a wireless transmission unit 5071.
  • the wireless transmission device 52f includes a wireless reception unit 5012, a required compression rate determination unit 5022, an OVH extraction unit 5032, a CPRI signal transmission unit 5042, a CPRI signal reception unit 5052, an OVH multiplexing unit 5062, and a wireless transmission unit 5072.
  • the wireless transmission devices 51 f and 52 f both have the same configuration and operation as the wireless transmission device 5.
  • the operation of the transmission path of the base station device 1f will be described. Since the base station apparatus 1f includes many configurations similar to those already described as described above, the description will be simplified.
  • the QoS control unit 211 is provided to face the compression rate information S11, S12, S21, S22 of the IQ data compression units 2011, 2012, 3051, and 3052 and the base station device 1f. Based on the compression rate information (information included in S21 and S22) acquired from another base station device (hereinafter referred to as an opposite base station device) (not shown), the network data supplied from the host device is distributed.
  • an opposite base station device another base station device
  • the QoS control unit 211 distributes network data having a high priority to transmission / reception paths in which a low compression rate is adopted (in other words, transmission / reception paths in which a high-multilevel modulation method is adopted), and a high compression ratio is obtained.
  • Network data having a low priority is allocated to a transmission / reception path to be employed (in other words, a transmission / reception path to which a low-value modulation scheme is employed).
  • the distribution OVH multiplexing units 231 and 234 multiplex the network data distributed by the QoS control unit 211 and information related to the data, respectively.
  • Information about data is stored in the OVH area of the data frame.
  • the QoS control information required for the opposite base station apparatus is also stored in the OVH area.
  • the IQ data generation unit 213 converts the network data output from the distribution OVH multiplexing unit 231 into IQ data D11 and outputs the IQ data D11.
  • the IQ data D11 is compressed, and then supplied to the wireless transmission device 41f through the same operation as the baseband processing device 2.
  • the wireless transmission device 41f modulates the compressed IQ data D11 into the microwave MW11, and then wirelessly transmits it through the antenna A11.
  • the wireless transmission device 51f demodulates the microwave MW11 wirelessly received via the antenna A12 into compressed IQ data D11 and outputs the compressed IQ data D11 to the wireless device 3f.
  • the IQ data generation unit 223 converts the network data output from the distribution OVH multiplexing unit 234 into IQ data D12 and outputs the IQ data D12.
  • the IQ data D12 is compressed and then supplied to the wireless transmission device 42f through the same operation as that of the baseband processing device 2.
  • the wireless transmission device 42f modulates the compressed IQ data D12 into the microwave MW12, and then wirelessly transmits the modulated data via the antenna A12.
  • the wireless transmission device 52f demodulates the microwave MW12 received wirelessly via the antenna A22 into compressed IQ data D12 and outputs the compressed IQ data D12 to the wireless device 3f.
  • the wireless device 3f decodes the compressed IQ data D11 and D12, combines them, and reproduces the IQ data D1.
  • the reproduced IQ data D1 is wirelessly transmitted via the antenna A3.
  • the OVH area of the radio signal wirelessly transmitted via the antenna A3 includes QoS control information for the opposite base station apparatus by the QoS control unit 211.
  • the received IQ data D1 is distributed based on the QoS control information.
  • the sorting OVH extraction unit 312 extracts, for example, QoS control information for the own station by the QoS control unit 211 from the OVH region of the wireless signal wirelessly received via the antenna A3.
  • the IQ data distribution unit 313 distributes the IQ data D2 wirelessly received via the antenna A3 based on the QoS control information for the own station.
  • the distributed IQ data D21 and D22 are respectively compressed and then supplied to the baseband processing device 2f via the wireless transmission devices 51f and 52f and the wireless transmission devices 41f and 42f.
  • the compressed IQ data D21 and D22 are respectively decoded and converted into network data by the NW data generation units 220 and 230. This network data is output to a host device (not shown).
  • the base station device 1f divides the IQ data into two signal components and performs wireless transmission via the two wireless transmission paths L11 and L12 formed between the two sets of wireless transmission devices.
  • wireless transmission of IQ data at a higher transmission rate can be realized.
  • the base station apparatus 1f performs QoS control in the baseband processing apparatus, thereby performing high-quality wireless transmission of high-priority IQ data, and lower-priority IQ data quality is lower but more reliable. Wireless transmission can be performed.
  • the baseband processing device 2f is provided with two IQ data compression units and the wireless device 3f is provided with two IQ data compression units has been described as an example.
  • the baseband processing device 2f may be provided with a common IQ data compression unit, and the wireless device 3f may be provided with a common IQ data compression unit.
  • FIG. 23 is a block diagram illustrating a specific configuration example of a baseband processing device 2g and wireless transmission devices 41g and 42g provided in a base station device 1g which is a modification of the base station device 1f.
  • FIG. 24 is a block diagram illustrating a specific configuration example of the wireless device 3g and the wireless transmission devices 51g and 52g provided in the base station device 1g which is a modification of the base station device 1f.
  • a CPRI standard signal (CPRI signal) is used to exchange data between the baseband processing device 2g and the wireless transmission devices 41g and 42g and to exchange data between the wireless transmission devices 51g and 52g and the wireless device 3g.
  • Ethernet standard signals (hereinafter also referred to as ETH signals) are used.
  • the baseband processing device 2g includes an ETH signal transmission unit 2051 and a compression rate information packet generation unit 2061 instead of the CPRI signal transmission unit 2021, and includes a CPRI signal reception unit 2031 and Instead of the compression rate information extraction unit 2101, an ETH signal reception unit 2071 and a compression rate information packet extraction unit 2081 are provided. Further, an ETH signal transmission unit 2052 and a compression rate information packet generation unit 2062 are provided instead of the CPRI signal transmission unit 2022, and an ETH signal reception unit 2072 is provided instead of the CPRI signal reception unit 2032 and the compression rate information extraction unit 2102. And a packet extraction unit 2082 such as compression rate information.
  • the wireless transmission device 41g Compared with the wireless transmission device 41f, the wireless transmission device 41g has an ETH signal reception unit 4081 instead of the CPRI signal 4011, and an ETH signal transmission unit 4091 instead of the CPRI signal transmission unit 4071, compression rate information, and the like.
  • a packet generation unit 4101 is included.
  • the wireless transmission device 42g Compared with the wireless transmission device 42f, the wireless transmission device 42g has an ETH signal reception unit 4082 instead of the CPRI signal 4012, and an ETH signal transmission unit 4092 instead of the CPRI signal transmission unit 4072, compression rate information, and the like.
  • a packet generation unit 4102 is included.
  • the wireless transmission device 51g includes an ETH signal reception unit 5101 instead of the CPRI signal reception unit 5051, and replaces the CPRI signal transmission unit 5041 with an ETH signal transmission unit 5081 and a compression rate.
  • An information packet generation unit 5091 is included.
  • the wireless transmission device 52g includes an ETH signal reception unit 5102 instead of the CPRI signal reception unit 5052, and replaces the CPRI signal transmission unit 5042 with an ETH signal transmission unit 5082 and a compression rate.
  • An information packet generation unit 5092 is included.
  • the wireless device 3g includes an ETH signal transmitting unit 3091 and a compression rate information packet generating unit 3101 instead of the CPRI signal transmitting unit 3061, and an ETH signal instead of the CPRI signal receiving unit 3011.
  • a receiving unit 3071 and a compression rate information packet extracting unit 3081 are included.
  • an ETH signal transmission unit 3092 and a compression rate information packet generation unit 3102 are provided instead of the CPRI signal transmission unit 3062, and an ETH signal reception unit 3072 and a compression rate information packet extraction unit 3082 are provided instead of the CPRI signal reception unit 3012.
  • the base station device 1g can achieve the same effects as the base station device 1f.
  • the case where the CPRI standard or the Ethernet standard is adopted as the data interface between the baseband processing device and the wireless device has been described as an example.
  • the present invention is not limited to this, and other high-speed data interface standards or A local interface standard may be employed.
  • FIG. 10 is a block diagram showing a configuration example of the base station apparatus 10 according to the first embodiment.
  • the structural example of the base station apparatus 10 which concerns on Embodiment 1 is demonstrated, the same thing can be said also about the base station apparatus which concerns on other embodiment.
  • the base station device 10 includes an RF transceiver 1001, a network interface 1003, a processor 1004, and a memory 1005.
  • the RF transceiver 1001 performs analog RF signal processing to communicate with user terminals (UEs).
  • the RF transceiver 1001 may include multiple transceivers.
  • RF transceiver 1001 is coupled to antenna 1002 and processor 1004.
  • the RF transceiver 1001 receives modulation symbol data (or OFDM symbol data) from the processor 1004, generates a transmission RF signal, and supplies the transmission RF signal to the antenna 1002. Further, the RF transceiver 1001 generates a baseband received signal based on the received RF signal received by the antenna 1002, and supplies this to the processor 1004.
  • the network interface 1003 is used to communicate with network nodes (e.g., other eNBs, Mobility Management Entity (MME), Serving Gateway (S-GW), and TSS or ITS server).
  • the network interface 1003 may include, for example, a network interface card (NIC) compliant with IEEE 802.3 series.
  • the processor 1004 performs data plane processing including digital baseband signal processing for wireless communication and control plane processing.
  • the digital baseband signal processing by the processor 1004 may include signal processing of a PDCP layer, an RLC layer, a MAC layer, and a PHY layer.
  • the signal processing by the processor 1004 may include signal processing of the GTP-U / UDP / IP layer at the X2-U interface and the S1-U interface.
  • the control plane processing by the processor 1004 may include processing of the X2AP protocol, the S1-MME protocol, and the RRC protocol.
  • the processor 1004 may include a plurality of processors.
  • the processor 1004 includes a modem processor (eg, DSP) that performs digital baseband signal processing, a processor (eg, processor) that performs signal processing of the GTP-U • UDP / IP layer in the X2-U interface and the S1-U interface. DSP) and a protocol stack processor (eg, CPU or MPU) that performs control plane processing may be included.
  • DSP modem processor
  • processor eg, processor
  • a protocol stack processor eg, CPU or MPU
  • the memory 1005 is configured by a combination of a volatile memory and a nonvolatile memory.
  • the memory 1005 may include a plurality of physically independent memory devices.
  • the volatile memory is, for example, Static Random Access Memory (SRAM), Dynamic RAM (DRAM), or a combination thereof.
  • the non-volatile memory is a mask Read Only Memory (MROM), Electrically Erasable Programmable ROM (EEPROM), flash memory, hard disk drive, or any combination thereof.
  • Memory 1005 may include storage located remotely from processor 1004. In this case, the processor 1004 may access the memory 1005 via the network interface 1003 or an I / O interface not shown.
  • the memory 1005 may store a software module (computer program) including an instruction group and data for performing processing by the base station apparatus 10.
  • the processor 1004 may be configured to perform processing of the base station apparatus 10 by reading the software module from the memory 1005 and executing the software module.
  • the processor included in the base station apparatus 10 executes one or a plurality of programs including a group of instructions for causing a computer to execute the algorithm described with reference to the drawings.
  • the program can be stored and supplied to a computer using various types of non-transitory computer readable media.
  • Non-transitory computer readable media include various types of tangible storage media (tangible storage medium).
  • non-transitory computer-readable media are magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), Compact Disc Read Only Memory (CD-ROM), CD-ROM R, CD-R / W, semiconductor memory (for example, mask ROM, Programmable ROM (PROM), Erasable PROM (EPROM), flash ROM, Random Access Memory (RAM)).
  • the program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
  • the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
  • Base station device 1, 1a to 1g Base station device 2, 2a to 2g Baseband processing device 3, 3a to 3g Wireless device 4, 4a, 4b Wireless transmission device 5, 5a, 5b Wireless transmission device 10 Base station device 20 Baseband processing unit 30 Radio unit 40 First signal radio transmission unit 50 Second signal radio transmission unit 41c-41g, 42c-42g Radio transmission device 51c-51g, 52c-52g Radio transmission device 200, 200f Baseband signal generation unit 201 IQ data compression Unit 202 CPRI signal transmission unit 203 CPRI signal reception unit 204 IQ data decoding unit 205 ETH signal transmission unit 206 compression rate information packet generation unit 207 ETH signal reception unit 208 compression rate information packet extraction unit 209 compression rate information extraction unit 211 QoS control unit 213, 223 IQ data generator 220, 230 NW data Data generator 231, 234 Sorting OVH multiplexer 301 CPRI signal receiver 302 IQ data decoder 303 Radio transmitter 304 Radio receiver 305 IQ data compressor 306 CPRI signal transmitter 307 ETH signal receiver 308 Com

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

Abstract

La présente invention concerne, dans un mode de réalisation, un appareil de communications sans fil comportant: un dispositif (2) de traitement en bande de base qui génère des données IQ; un dispositif (4) de transmission sans fil qui module les données IQ en micro-ondes et émet sans fil les micro-ondes; un dispositif (5) de transmission sans fil qui démodule, pour obtenir des données IO, les micro-ondes reçues sans fil via un trajet (L1) de transmission sans fil vers le dispositif (4) de transmission sans fil; et un dispositif (3) sans fil qui module en un signal à haute fréquence les données IO démodulées par le dispositif (5) de transmission sans fil, et émet vers l'extérieur ledit signal à haute fréquence, le dispositif (2) de traitement en bande de base compressant les données IQ selon un taux de compression de données dépendant de la qualité de communication sur le trajet (L1) de transmission sans fil, et le dispositif (4) de transmission sans fil modulant les données IQ en micro-ondes en utilisant un format de modulation approprié en fonction de la qualité de communication sur le trajet (L1) de transmission sans fil.
PCT/JP2016/004799 2015-12-21 2016-11-02 Appareil, système et procédé de communications sans fil WO2017110029A1 (fr)

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Cited By (1)

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WO2020031710A1 (fr) * 2018-08-10 2020-02-13 ソニー株式会社 Dispositif de communication sans fil et procédé de commande de communication

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JP2009231970A (ja) * 2008-03-19 2009-10-08 Fujitsu Ltd 無線制御装置、無線装置、および通信システム
WO2014192041A1 (fr) * 2013-05-29 2014-12-04 Kddi株式会社 Système de stations de base, et appareil de communication
JP2014230098A (ja) * 2013-05-22 2014-12-08 Kddi株式会社 通信装置及びその制御方法
WO2015015715A1 (fr) * 2013-07-30 2015-02-05 日本電気株式会社 Appareil de gestion de réseau, procédé d'amélioration de l'état de connexion et support lisible par ordinateur non transitoire contenant un programme
JP2015156602A (ja) * 2014-02-21 2015-08-27 株式会社モバイルテクノ 複素デジタル信号圧縮装置及びプログラム、複素デジタル信号伸長装置及びプログラム、並びに、通信装置

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JP2009231970A (ja) * 2008-03-19 2009-10-08 Fujitsu Ltd 無線制御装置、無線装置、および通信システム
JP2014230098A (ja) * 2013-05-22 2014-12-08 Kddi株式会社 通信装置及びその制御方法
WO2014192041A1 (fr) * 2013-05-29 2014-12-04 Kddi株式会社 Système de stations de base, et appareil de communication
WO2015015715A1 (fr) * 2013-07-30 2015-02-05 日本電気株式会社 Appareil de gestion de réseau, procédé d'amélioration de l'état de connexion et support lisible par ordinateur non transitoire contenant un programme
JP2015156602A (ja) * 2014-02-21 2015-08-27 株式会社モバイルテクノ 複素デジタル信号圧縮装置及びプログラム、複素デジタル信号伸長装置及びプログラム、並びに、通信装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020031710A1 (fr) * 2018-08-10 2020-02-13 ソニー株式会社 Dispositif de communication sans fil et procédé de commande de communication

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