WO2012169400A1 - パスロス算出方法、パスロス算出装置、パスロス算出プログラム、無線通信システム、スペクトルマネージャ - Google Patents
パスロス算出方法、パスロス算出装置、パスロス算出プログラム、無線通信システム、スペクトルマネージャ Download PDFInfo
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- 238000001228 spectrum Methods 0.000 title claims abstract description 73
- 238000004891 communication Methods 0.000 title claims abstract description 32
- 238000004364 calculation method Methods 0.000 title claims description 23
- 238000005259 measurement Methods 0.000 claims abstract description 386
- 238000012544 monitoring process Methods 0.000 claims abstract description 180
- 230000005540 biological transmission Effects 0.000 claims abstract description 148
- 238000012937 correction Methods 0.000 claims abstract description 113
- 208000032370 Secondary transmission Diseases 0.000 abstract description 80
- 208000032369 Primary transmission Diseases 0.000 description 45
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- 238000006243 chemical reaction Methods 0.000 description 6
- 230000001149 cognitive effect Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- 230000001413 cellular effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
Definitions
- the present invention relates to a path loss calculation method, a path loss calculation apparatus, a path loss calculation program for calculating a propagation loss between radio stations, a radio communication system and a spectrum manager for performing power control using a path loss value.
- Cognitive radio that recognizes the surrounding wireless environment and optimizes communication parameters according to the wireless environment is known.
- a secondary system interfering system
- a primary system interfered system
- the transmission power of the secondary system transmitting station (hereinafter referred to as the secondary transmitting station) is adjusted so that the predetermined reception quality at the receiving station of the primary system (hereinafter referred to as the primary receiving station) can be maintained (
- the primary receiving station the transmission power of the secondary system transmitting station
- CIR Carrier Interference Ratio
- CINR Carrier Interference plus Noise Ratio
- Non-Patent Document 1 discloses an allowable transmission power for maintaining a CIR at a predetermined value or more in a receiving station of a TV (Television) broadcasting system as a primary system.
- a path loss propagation loss
- a signal (secondary signal) transmitted from a secondary transmitting station reaches the primary receiving station is estimated, and an amount of interference of the primary receiving station caused by the secondary signal is estimated.
- the allowable transmission power is determined.
- path loss estimation includes errors due to shadowing and errors due to differences between propagation models (path loss estimation formulas such as the Okumura / Hata equation) and the actual environment, CIR estimation errors result.
- Non-Patent Document 1 the allowable transmission power is set by adding a margin corresponding to the magnitude of the CIR error. By so doing, it is possible to limit the allowable transmission power in accordance with the magnitude of the CIR estimation error and maintain the CIR with a predetermined probability.
- Patent Document 1 discloses that a base station apparatus in a wireless communication system shares a frequency band that is common and / or adjacent to another wireless communication system, and a frequency band to be used and a frequency used by the other wireless communication system.
- the separation frequency width from the band is obtained, the separation distance between the base station device and the receiving device included in the other wireless communication system is obtained, and the communication of the other wireless communication system which is the priority system based on the separation frequency and the separation distance. It is described to determine the maximum transmission power that does not disturb the quality.
- This Patent Document 1 describes the use of a free space propagation loss equation for the calculation of the separation distance and the estimated propagation loss amount. In the case of Patent Document 1, as in the case of Non-Patent Document 1, since an error due to a difference from the actual environment is included, a CIR estimation error occurs as a result.
- Non-Patent Document 2 a monitoring station (described as a secondary system receiving station (secondary receiving station) in the vicinity of the primary receiving station) is used as a secondary signal or a primary system transmitting station (primary transmission).
- the interference level monitoring used to estimate the CIR at the primary receiving station by measuring the reception level of the signal (primary signal) transmitted from the primary station is shown.
- the estimated value of the path loss used in Non-Patent Document 1 is actually measured and corrected using the reception levels of the secondary signal and the primary signal measured by the monitoring station.
- the CIR estimation error can be reduced by correcting the estimated value of the path loss using the measurement result, the margin necessary for suppressing the allowable transmission power can be reduced, and as a result, the allowable transmission power can be increased. Further, by using the monitoring station for measurement, there is an advantage that the CIR estimation accuracy at the primary receiving station can be improved without changing the receiving station of the primary system which is the priority system.
- ECC Electronic Communications Committee
- CEPT European Conference of Postal and Telecommunications Administrations
- TECHNICAL AND OPERATIONAL REQUIREMENTS FOR THE POSSIBLE OPERATION OF COGNITIVE RADIO SYSTEM -35 January, 2011.
- Kazushi Muraoka, Hiroto Sugawara, Masayuki Ariyoshi “Study of White Space Secondary Use Cognitive Radio System (3)-Advanced Spectrum Control Based on Interference Monitoring”, IEICE Society Conference, B-17-2, 2010 September
- Non-Patent Document 2 measurement errors may be a problem when the monitoring station measures the reception level of the secondary signal. This is because the allowable transmission power is set so that the reception level of the secondary signal at the monitoring station is relatively smaller than the reception level of the primary signal transmitted in the same frequency band (to ensure the required CIR). Is to be transmitted. In this case, since it is necessary to measure the reception level of the secondary signal in the frequency band in which the primary signal having a large reception level exists, it is difficult to accurately measure the reception level because the secondary signal is affected by the primary signal. If there is a large measurement error in the measured reception level, the CIR estimation error cannot be reduced even if the path loss is corrected using the measurement result. Therefore, there is a possibility that the margin necessary for suppressing the allowable transmission power cannot be reduced.
- the present invention has been made to solve the above-described problem, and a path loss calculation method, a path loss calculation device, and a path loss calculation program capable of accurately correcting an estimated value of a path loss until a secondary signal reaches a primary receiving station. And a wireless communication system and a spectrum manager.
- a path loss calculation method is provided between a transmitting station of the own wireless system and a wireless system receiving station of another person existing in the service area of the transmitting station of the other wireless system.
- the reception power value of the radio signal of its own radio system transmission station transmitted at a time when the transmission station of another radio system does not use the first frequency is measured at the service area and its surrounding monitoring stations.
- the path loss value estimated by using the measured value of the received power of the own wireless system signal is corrected.
- the path loss calculating apparatus calculates a path loss value between a transmitting station of its own wireless system and a wireless system receiving station of another person existing in the service area of the transmitting station of the other person's wireless system as a first frequency. And the measured value of the received power of the radio signal of the own radio system transmitter station transmitted at the second frequency of the transmitter station of the other person's radio system different from the first frequency, or the other party Means for correcting a path loss value estimated using one of the measured values of the received power of the radio signal of the own radio system transmitter station transmitted at a time when the transmitter station of the radio system does not use the first frequency; It is characterized by providing.
- a path loss calculation program calculates a path loss value between a transmitting station of its own wireless system and a wireless system receiving station of another person existing in the service area of the transmitting station of the other person's wireless system.
- the wireless communication system shares the same frequency as that of the transmission station of the primary system with the secondary system, so that the transmission signal of the secondary system does not interfere with the primary system.
- the primary system includes at least a transmission station of the primary system and a reception station of the primary system
- the secondary system includes at least a transmission station of the secondary system.
- the first manager estimates the path loss value between the secondary system transmitting station and the primary system receiving station at the first frequency, and is transmitted at the second frequency of the primary system transmitting station different from the first frequency.
- the path loss value between the estimated transmission station of the secondary system and the reception station of the primary system is corrected, and the allowable transmission power of the transmission station of the secondary system is calculated using the corrected path loss value.
- a spectrum manager is a spectrum manager that manages a secondary system that shares the same frequency as the transmission station of the primary system, and is located in and around the service area of the transmission station of the primary system.
- Communication means for receiving the received power value measured by the station, path loss estimation means for estimating a path loss value between the transmitting station of the secondary system and the receiving station of the primary system at the first frequency, and the reception measured by the monitoring station
- a measurement result storage means for holding a power value, and a received power value of a radio signal of a transmitting station of the secondary system transmitted at a second frequency of the transmitting station of the primary system different from the first frequency, or of the primary system The cell transmitted at a time when the transmitting station does not use the first frequency.
- a path loss correction unit that corrects a path loss value between the estimated transmitter station of the secondary system and the receiver station of the primary system using the received power value of the radio signal of the transmitter station of the primary system, and a corrected path loss value.
- an allowable power setting means for calculating the allowable transmission power of the transmission station of the secondary system.
- a path loss value is estimated at a first frequency corresponding to a frequency used by a primary receiving station to be protected, and another second frequency different from the first frequency or the first frequency Even so, the received power of the secondary signal measured by the monitoring station during the unused time is used for the path loss actual measurement correction.
- the secondary signal can be measured in an environment where the primary received power is small, and the measurement error can be reduced. Since the path loss estimated value in the propagation path from the secondary transmitting station to the primary receiving station can be accurately corrected, as a result, in a wireless system in which the same frequency is shared between the primary system frequency and the secondary system, the allowable transmission power is suppressed. The margin required for the transmission can be reduced, and the allowable transmission power can be set to the maximum.
- FIG. 1 is a system configuration diagram showing an example of a cognitive radio system according to the first embodiment of the present invention.
- the cognitive radio system performs communication by sharing a frequency with the primary system as a secondary system.
- the primary system is a TV broadcasting system and the secondary system is a cellular system.
- this configuration is merely an example, and the combination of the primary system and the secondary system is not limited to such a configuration.
- the combination of the primary system and the secondary system can be, for example, a combination of a TV system and a WRAN (Wireless Regional Access Network) system, or a combination of a TV system and a local radio such as a local government or a disaster prevention radio.
- the primary system may be a wireless microphone or a special purpose radio (for example, an apartment radio, an in-house radio, an agricultural radio, etc.)
- the secondary system is a wireless local area network (LAN).
- LAN wireless local area network
- the configuration of the first embodiment of the present invention is not necessarily limited to a combination of radio systems having different priorities when using frequencies, such as a primary system and a secondary system. It may be configured to share the frequency.
- the primary system includes a primary transmitting station 20 and a primary receiving station 21.
- a primary transmitting station 20 transmits to a primary transmitting station 20 and a primary receiving station 21.
- one primary receiving station 21 is shown, but there may be a plurality of primary receiving stations 21.
- the secondary system includes a secondary transmission station 10, a spectrum manager 12, a monitoring station 11, a geographic database 13, and a core network 14.
- the secondary system may include a configuration other than the above (for example, a receiving station of a secondary system that is a communication partner of the secondary transmitting station 10), but these configurations are not directly related to the embodiment of the present invention. 1 are not shown in FIG. 1 for the sake of clarity.
- Secondary transmission station 10 secondary uses the frequency band of the primary system for communication. At this time, the secondary transmitting station 10 makes a secondary use request (it is also possible to specify the time or frequency of secondary use) to the spectrum manager 12 via the core network 14, and from the spectrum manager 12 as a response to the request. Allowable transmission power is specified.
- the secondary system communicates with the primary system by sharing the frequency.
- the secondary transmission station 10 performs transmission with transmission power equal to or less than the allowable transmission power, so that even if the secondary system and the primary system share the frequency, the primary reception station 21 is predetermined.
- the amount of interference of the secondary transmitting station 10 is limited so that the reception quality can be maintained.
- this reception quality is assumed to be the CIR (Carrier-to-Interference-Ratio) of the primary receiving station 21.
- the allowable transmission power of the secondary transmission station 10 is set to the maximum transmission power at which the CIR of the primary reception station 21 becomes a predetermined value or more. Thereby, even if the secondary transmitting station 10 transmits using the same frequency as the primary transmitting station 20, the primary receiving station 21 receives a signal from the primary transmitting station 20 while maintaining a predetermined reception quality. be able to.
- the allowable transmission power of the secondary transmission station 10 is updated by actually correcting the path loss estimated value as will be described later.
- the secondary transmission station 10 In order for the spectrum manager 12 to perform the actual correction of the path loss estimated value and the selection of the monitoring station 11, the secondary transmission station 10 notifies the spectrum manager 12 of the transmission power and the frequency in use.
- the monitoring station 11 is located around the primary receiving station 21 and measures the received power of the secondary signal from the secondary transmitting station 10 and the received power of the primary signal from the primary transmitting station 20.
- the measured received power is sent to the spectrum manager 12 via the core network 14. As will be described later, the measured received power is used to correct the path loss estimated value.
- the secondary transmission station 10 and the monitoring station 11 can be, for example, a base station, a relay station, or a terminal station in a cellular system.
- the monitoring station 11 may be a station (monitoring sensor) that performs monitoring exclusively.
- the secondary transmitting station 10 and the monitoring station 11 are base stations and the core network can be used will be described as an example. In FIG. 1, only one monitoring station 11 is illustrated, but it is assumed that a plurality of monitoring stations are arranged in a plane like a base station of a cellular system.
- the spectrum manager 12 basically has a function of managing the frequency usage of the secondary system.
- the spectrum manager 12 notifies the allowable transmission power that can be used at each usable frequency to the secondary transmission station 10 that requests secondary use of the frequency band of the primary system.
- the spectrum manager 12 receives information on the frequency in use (or information on the frequency to be used) from the secondary transmission station 10 and transmits a measurement request to the monitoring station 11. At this time, the spectrum manager 12 selects one or a plurality of monitoring stations 11 that actually perform measurement from the plurality of monitoring stations 11, and transmits a measurement request. A method for selecting the monitoring station 11 will be described later.
- the spectrum manager 12 calculates a path loss estimated value between the secondary transmitting station 10 and the primary receiving station 21 and a path loss estimated value between the primary transmitting station 20 and the primary receiving station 21. Further, the spectrum manager 12 receives the received power measurement value of the primary signal from the primary transmission station 20 in the monitoring station 11 and the received power measurement value of the secondary signal from the secondary transmission station 10 via the core network 14, and this Holds measurement results.
- the measurement result is the received power value measured by the monitoring station 11, but the result of quantizing the received power value or another value proportional to the received power (for example, the pilot signal and the received signal). Correlation value) or the like.
- the spectrum manager 12 selects a measurement result suitable for correcting the path loss estimated value based on the measurement accuracy information from the stored measurement results, and performs actual measurement correction of the path loss estimated value.
- path loss estimation is performed at the first frequency corresponding to the frequency used by the primary receiving station 21 to be protected, which is different from the first frequency.
- the received power value of the secondary signal measured at the second frequency or the received power value of the secondary signal measured at a time different from the time used by the primary receiving station even at the same frequency is used for the path loss actual measurement correction. .
- the path loss estimated value can be actually measured and corrected with higher accuracy.
- the spectrum manager 12 calculates the allowable transmission power using the path loss estimated value that has been actually corrected, and transmits it to the secondary transmission station 10 to set the allowable transmission power of the secondary transmission station 10. That is, the spectrum manager 12 uses the path loss estimated value from the primary transmitting station 20 to the primary receiving station 21 and the path loss estimated value from the secondary transmitting station 10 to the primary receiving station 21 that have been actually corrected. The reception power of the primary signal and the reception power of the secondary signal are estimated, and the allowable transmission power of the secondary transmission station 10 is set to the maximum transmission power at which the CIR becomes a predetermined value or more.
- the spectrum manager 12 may be a single device or may be provided as a function in the same device as the secondary transmission station 10 and the monitoring station 11. Furthermore, each function of the spectrum manager 12 may be separately provided as a function in each device of the secondary transmission station 10 and the monitoring station 11.
- the geographic database 13 stores predetermined information about the primary system and the secondary system (for example, information on the position of the wireless station, the coverage of the wireless station, the transmission power, the height of the antenna, the directivity of the antenna, etc.).
- the geographic database 13 provides these pieces of information to requesters (for example, the spectrum manager 12, the secondary transmission station 10, and the monitoring station 11) as necessary.
- the geographic database 13 may be separated as a plurality of database devices in order to separately manage primary system information and secondary system information.
- the geographic database 13 may be a device in which a part of the functions of the spectrum manager 12 (for example, the frequency-specific / time-specific measurement result storage unit 104 described later) or all of them are integrated.
- the core network 14 is a network through which the secondary transmission station 10, the monitoring station 11, the spectrum manager 12, and the geographic database 13 communicate.
- This network may be a core network closed to a telecommunications carrier, or a network spanning a plurality of telecommunications carriers. Further, this network may be a wired network or a wireless network.
- FIG. 2 is a system configuration diagram showing an example of the geographical relationship between the primary system and the secondary system.
- FIG. 2 shows a primary transmitting station 20 (20_1 to 20_7), a primary receiving station 21 (21_1 to 21_7), a primary system service area 22 (22_1 to 22_7), a secondary transmitting station 10, and a monitoring station 11.
- the primary transmitting station 20 (20_1 to 20_7) and the primary receiving station 21 (21_1 to 21_7) constitute a primary system.
- the secondary transmission station 10 and the monitoring station 11 constitute a secondary system.
- Primary transmission stations 20_1 to 20_7 indicate a plurality of stations as transmission stations using any of the frequencies f1 to f14.
- the primary transmission station 20_1 is f1, f8, the primary transmission station 20_2 is f2, f9, the primary transmission station 20_3 is f3, f10, the primary transmission station 20_4 is f4, f11, and the primary transmission station 20_5 is f5, f12, primary
- the transmitting station 20_6 is shown as using f6 and f13, and the primary transmitting station 20_7 is shown as using f7 and f14.
- a plurality of frequencies are allocated to broadcasting in each station as in FIG.
- the frequency allocation method is not limited to this.
- the primary system service areas 22_1 to 22_7 are assumed to be service areas divided by hexagonal cells, and it is assumed that the service areas of the two frequencies used by the primary transmitting stations 20_1 to 20_7 are the same.
- the primary system service areas 22_1 to 22_7 are service areas designed such that geographically adjacent service areas overlap, and are included in a plurality of service areas of different transmitting stations at one position. It does not matter.
- the secondary transmitting station 10 is assumed to be located in the primary system service area 22_1 that uses the frequencies f1 and f8, and it is assumed that the frequency f6 is secondarily used at that position.
- the monitoring station 11 is illustrated assuming a monitoring station in the vicinity of a position where the influence of interference is large (for example, the distance from the secondary transmission station 10 is short) when the secondary transmission station 10 uses the frequency f6. . Actually, it is assumed that a plurality of monitoring stations 11 are expanded.
- the monitoring station 11 when the secondary transmission station 10 uses the frequency f6, the monitoring station 11 in the vicinity of the position where the influence of interference is maximized transmits the signal transmitted from the secondary transmission station 10 and the primary transmission station 20_6. The received power of the received primary signal is measured. Then, this received power measurement value is sent to the spectrum manager 12.
- the spectrum manager 12 corrects the path loss estimated value between the secondary transmitting station 10 and the primary receiving station 21_6 and the path loss estimated value between the primary transmitting station 20_6 and the primary receiving station 21_6. Do. Then, the spectrum manager 12 determines the allowable transmission power of the secondary transmission station 10 so that the primary system can be protected at a position where the influence of interference is maximized in the primary system service area 22_6 of the frequency f6. .
- FIG. 3 is a block diagram showing the configuration of the spectrum manager 12.
- the spectrum manager 12 includes a network communication unit 101, a monitoring station determination unit 102, a measurement accuracy calculation unit 103, a frequency and time measurement result storage unit 104, a path loss estimation unit 105, The path loss correction unit 106 and the allowable transmission power setting unit 107 are configured.
- the network communication unit 101 has a function for each unit of the spectrum manager 12 to communicate with other devices (secondary transmission station 10, monitoring station 11, geographic database 13, etc.) via the core network 14.
- the monitoring station determination unit 102 receives the notification of the frequency used by the secondary transmission station 10 or the frequency determined to be used, and determines the monitoring station 11 that measures the radio signal.
- the monitoring station determination unit 102 transmits a measurement request to the determined monitoring station 11 and instructs a frequency to be measured.
- the measurement frequency specified in the measurement request may be set such that the frequency for measuring the secondary signal and the frequency for measuring the primary signal can be set separately.
- the measurement accuracy calculation unit 103 has a function of using the measurement result received from the monitoring station 11 as an input, calculating measurement accuracy information, and storing the measurement result and the measurement accuracy information in the measurement result storage unit 104 by frequency / time. .
- the calculation of measurement accuracy information will be described later.
- the measurement result storage unit 104 by frequency / time has a function of storing the measurement result by frequency (measurement frequency) at which measurement is performed or by time (measurement time) at which measurement is performed. This measurement result is held for each combination of the secondary transmission station 10 and the monitoring station 11.
- the path loss estimation unit 105 receives the secondary usage request sent from the secondary transmission station 10 and uses the propagation model corresponding to each frequency that is a candidate for secondary usage, so that the secondary transmission station 10 and the primary reception station 21 are used. The function of calculating the path loss estimated value between is provided. Further, the path loss estimation unit 105 has a function of calculating a path loss estimated value between the primary transmitting station 20 and the primary receiving station 21.
- the path loss correction unit 106 performs actual measurement correction of the path loss estimated value based on the measurement result held in the frequency-specific / time-specific measurement result storage unit 104. In the first embodiment of the present invention, the path loss correction unit 106 performs actual correction using the received power measurement value of the secondary signal when correcting the path loss estimated value between the secondary transmission station 10 and the primary reception station 21. Do.
- the path loss correction unit 106 As the received power measurement value, the received power of the secondary signal transmitted at a frequency (second frequency) different from the frequency used in the primary receiving station 21 to be protected and measured by the monitoring station 11 or the protection target The reception power transmitted at a time different from the time used by the primary receiving station 21 and measured by the monitoring station 11 is used.
- the path loss estimated value between the primary transmitting station 20 and the primary receiving station 21 is estimated using the third frequency, and the received power measured value of the primary signal is used for the actual measurement correction.
- the received power measurement value of the primary signal is transmitted from the primary transmission station 20 at a frequency (fourth frequency) different from the frequency used by the secondary transmission station (secondary transmission station 10 or another secondary transmission station). Received power measured by the monitoring station 11 or transmitted from the primary transmitting station 20 at a time different from the time used by the secondary transmitting station 10 even at the same frequency and measured by the monitoring station 11 Use power.
- the path loss correcting unit 106 when correcting the path loss estimated value between the secondary transmitting station 10 and the primary receiving station 21, includes secondary frequencies at a plurality of frequencies including the frequency used by the primary receiving station 21 to be protected.
- the measurement accuracy is high from the measurement accuracy information.
- the measured received power measurement value is used.
- the measurement accuracy information for the received power value of the secondary signal the received power estimated value of the primary signal in the monitoring station 11 calculated using the propagation model is used, and the secondary signal with the smallest received power estimated value of the primary signal is used.
- the received power measurement value is used for actual measurement correction.
- the actual measurement correction method corrects the path loss estimated value from the secondary transmitting station 10 to the primary receiving station 21 using a difference value between the received power estimated value of the secondary signal and the received power estimated value of the secondary signal as a correction value.
- the path loss correction unit 106 corrects the path loss estimated value between the primary transmission station 20 and the primary reception station 21, the primary reception power measurement at a plurality of frequencies including the frequency used by the secondary transmission station 10 is performed.
- the measurement accuracy is high from the measurement accuracy information as described above.
- the measured received power is used.
- the measurement accuracy information for the received power value of the primary signal in this case, the received power estimated value of the secondary signal in the monitoring station 11 calculated using the propagation model is used, and the received power estimated value of the secondary signal is the minimum.
- the received power measurement value of the primary signal is used for the actual measurement correction.
- the actual measurement correction method corrects the path loss estimated value to the primary transmitting station 20 and the primary receiving station 21 using the difference value between the received power estimated value of the primary signal and the received power measured value of the primary signal as a correction value.
- the allowable transmission power setting unit 107 uses the path loss estimated value from the primary transmitting station 20 to the primary receiving station 21 and the path loss estimated value from the secondary transmitting station 10 to the primary receiving station 21 that have been actually corrected, at the primary receiving station 21.
- the reception power of the primary signal and the reception power of the secondary signal are estimated, and the allowable transmission power of the secondary transmission station 10 is set to the maximum transmission power at which the CIR becomes a predetermined value or more.
- the measurement accuracy calculation unit 103 receives the measurement result received from the monitoring station 11, calculates measurement accuracy information, and sends the measurement result and measurement accuracy information to the measurement result storage unit 104 for each frequency and time. Processing to store. A method for calculating the measurement accuracy in the measurement accuracy calculation unit 103 at this time will be described below.
- the received power estimated value of the primary signal at the monitoring station 11 calculated based on the path loss estimation using the propagation model is used as the measurement accuracy information for the received power measured value of the secondary signal. ing.
- the received power estimated value C Mon Est of the primary signal at the monitoring station 11 can be calculated by the following equation.
- P Pri is the transmission power of the primary transmission station 20 at the frequency / time (measurement frequency / measurement time) measured by the monitoring station 11
- G Pri Tx is the transmission antenna gain of the primary transmission station 20
- L Pri -Mon is an estimated path loss value between the primary transmission station 20 and the monitoring station 11 calculated using the propagation model
- G Pri-Mon Rx is a reception antenna gain of the monitoring station 11 in the direction of the primary transmission station 20.
- the frequency (or wavelength) in the propagation model is a frequency (or wavelength) corresponding to the frequency used by the primary receiving station to be protected.
- the unit of each term is dB or dBm, and the same applies to the variables in the following explanation.
- the path loss estimated value between the primary transmitting station 20 and the monitoring station 11 uses a propagation model using parameters such as the distance between the primary transmitting station 20 and the monitoring station 11 (which can be calculated from the position information of each station) and the antenna height of each station. Can be calculated. Further, the transmission power information, transmission antenna gain, transmission antenna height, position information, reception antenna gain of the monitoring station 11, position information, etc. are held in the geographic database 13 through the core network 14. Shall be obtained and used. Similarly, when calculating the received power estimation value or the path loss estimation value in the following description, necessary information is acquired from the geographic database 13.
- the estimated reception power value of the primary signal When the estimated reception power value of the primary signal is low in the monitoring station 11, it is possible to determine that the measurement error is reduced and the measurement accuracy is high because the reception power of other signals other than the secondary signal is small.
- the estimated received power value of the primary signal at the monitoring station 11 when the estimated received power value of the primary signal at the monitoring station 11 is high, it can be determined that the received power of other signals other than the secondary signal is large, so that the measurement error is large and the measurement accuracy is low. Therefore, if the received power estimated value of the primary signal is obtained as shown in Equation (1), the received power estimated value of the primary signal can be used as measurement accuracy information for the received power measured value of the secondary signal.
- the measurement accuracy for the received power measurement value of the secondary signal has been described above, as the measurement accuracy information for the received power measurement value of the primary signal, reception of the secondary signal in the monitoring station 11 calculated based on the path loss estimation by the propagation model is performed. Assume power estimation value.
- the transmission power of the secondary transmission station 10 at the frequency / time measured by the monitoring station 11, the transmission antenna gain of the secondary transmission station 10, and the secondary transmission as in the equation (1).
- the path loss estimated value between the station 10 and the monitoring station 11 and the reception antenna gain in the direction of the secondary transmitting station 10 in the monitoring station 11 are calculated.
- the secondary signal transmission power is acquired from the secondary transmission station 10 at the measurement frequency and measurement time measured by the monitoring station.
- the estimated path loss between the secondary transmitting station 10 and the monitoring station 11 is a propagation model using parameters such as the distance between the secondary transmitting station 10 and the monitoring station 11 (which can be calculated from the position information of each station) and the antenna height of each station. Can be calculated by using.
- the measurement accuracy calculation unit 103 calculates the received power estimation value of the primary signal calculated based on the propagation model as the measurement accuracy information for the received power measurement value of the secondary signal, and As the measurement accuracy information, an estimated received power value of the secondary signal calculated based on the propagation model is calculated.
- the measurement accuracy information calculated in this way is held in the measurement result storage unit 104 for each frequency / time.
- FIG. 4 is an example of the measurement result by frequency held in the measurement result storage unit 104 by frequency / time when the primary system and the secondary system are arranged as shown in FIG.
- the received power measurement value of the secondary signal transmitted from the secondary transmission station 10 at the frequencies f4, f5, and f6 and the received power measurement value of the primary signal transmitted from the primary signal 20_6 at the frequencies f6 and f13 are measured. It shows.
- the received power estimated value of the primary signal is held as measurement accuracy information for the received power measured value of the secondary signal.
- a primary transmission station 20_4 having a frequency f4 is located in the primary system service area 22_4, and a primary transmission station 20_5 having a frequency f5 is located in the primary system service area 22_5.
- the primary transmission station 20_6 having the frequency f6 is located.
- FIG. 5 shows received power at the frequencies f4, f5, and f6 at the monitoring station 11 at this time.
- the primary transmission station 20_4 Since the primary transmission station 20_4 is away from the monitoring station 11, the power estimation value of the primary signal reception at the frequency f4 is small, and the measurement accuracy of the reception power measurement value of the secondary signal at the frequency f4 is high. Since the primary transmission station 20_5 is closer to the monitoring station 11 than the primary transmission station 20_4, the measurement accuracy of the received power measurement value of the secondary signal at the frequency f5 is lower than that at the frequency f4. On the other hand, since the primary transmitting station 20_6 is close to the monitoring station 11, the estimated reception power value of the primary signal at the frequency f6 is large, and the measurement accuracy of the received power measurement value of the secondary signal at the frequency f6 is large. Becomes lower.
- the measurement result and measurement accuracy measured for each frequency are stored in the measurement result storage unit 104 for each frequency / time.
- the measurement result and the measurement accuracy measured for each time are measured for each frequency / time. You may make it hold
- the received power measurement value of the secondary signal becomes the measurement accuracy information, and the higher the received power estimate value of the secondary signal, the more the measurement of the primary signal becomes. The error is large and the measurement accuracy is low.
- FIG. 6 is an example of the measurement result by time held in the measurement result storage unit 104 by frequency / time.
- the example of FIG. 6 is different from the example of FIG. 4 in that the measurement result at a certain measurement frequency is held for each time.
- FIG. 7 is an example in which the received power estimation value of the primary signal in FIG. 6 is displayed for each measurement time.
- the time t1 is 3 o'clock
- the time t2 is 11 o'clock
- the time t3 is 19 o'clock.
- the reception power of the primary signal is set to zero.
- the measurement accuracy of the measured received power value of the secondary signal at time t1 becomes high.
- the estimated received power value of the primary signal at other times t2 and t3 increases, and the measurement accuracy of the received power measurement value of the secondary signal at times t2 and t3 decreases.
- the measurement results classified by the measured time (time t1, t2, t3) for each measurement frequency (f4, f5, f6) are measured by frequency and time by time measurement result storage unit 104. It is also possible to hold it.
- the path loss estimation unit 105 receives the secondary usage request sent from the secondary transmission station 10 and, for each frequency that is a candidate for secondary usage, the secondary transmission station 10 and the primary reception station 21. The path loss estimated value between is calculated. Further, the path loss estimation unit 105 can also calculate a path loss estimated value between the primary transmitting station 20 and the primary receiving station 21.
- the path loss estimated by the path loss estimation unit 105 corresponds to information such as frequency and time included in the secondary usage request.
- the time is specified depending on whether the secondary transmitting station 10 secondary uses the frequency at the current time or performs secondary usage in the future.
- the secondary use request of the secondary transmitting station 10 may not include information specifying the frequency and time, and may perform path loss estimation for all of the secondary use candidate frequencies.
- the frequency of the secondary usage candidate that is the target of path loss estimation, path loss correction, and allowable transmission power setting is assumed to be one, but as described above, when there are a plurality of secondary usage candidate frequencies. The same operation is performed for each frequency.
- the path loss estimation unit 105 identifies the position of the primary receiving station 21 where the interference is maximized when the secondary transmitting station 10 uses the secondary usage candidate frequency.
- the secondary use candidate frequency is set to f6.
- the primary system service area 22_6 that uses the same frequency f6 as the secondary usage frequency in the primary system service areas 22_1 to 22_7 gives interference.
- the amount of interference is considered to be maximum at the primary reception station 21_6 closest to the secondary transmission station 10 at the service area end.
- the primary receiving station 21_6 at the specified position is set as a primary receiving station to be protected.
- the position of the primary reception station to be protected is not necessarily one, and there may be a plurality of primary reception stations 21 to be protected in an area where the interference is estimated to be a predetermined value or more.
- the path loss estimating unit 105 calculates the path loss estimated value between the secondary transmitting station 10 and the primary receiving station 21_6 from the distance between the secondary transmitting station 10 and the primary receiving station 21_6 (which can be calculated from the position information of each station) and each station. It is calculated by using a propagation model with the antenna height and so on as a parameter. Further, the path loss estimation unit 105 calculates the path loss estimated value between the primary transmission station 20_6 and the primary reception station 21_6 from the distance between the primary transmission station 20_6 and the primary reception station 21_6 (which can be calculated from the position information of each station) and Calculation is performed using a propagation model with antenna height as a parameter.
- the path loss estimated values calculated in this way and the position information of the protected primary receiving station 21_6 are output from the path loss estimating unit 105 and input to the path loss correcting unit 106.
- the path loss correction unit 106 performs actual measurement correction of the path loss estimation value between the secondary transmission station 10 and the primary reception station 21_6 input from the path loss estimation unit 105. It is also possible to perform actual measurement correction of the path loss estimated value between the primary transmitting station 20 and the primary receiving station 21_6.
- the processing of the path loss correction unit 106 will be further described in detail.
- the path loss correcting unit 106 performs the following processing when performing actual measurement correction of the path loss estimated value between the secondary transmitting station 10 and the primary receiving station 21_6.
- the path loss correcting unit 106 identifies the nearby monitoring station 11 by comparing the input position information of the primary receiving station 21_6 with the position information of the monitoring station 11. Next, the path loss correction unit 106 searches whether the measurement result of the reception power of the secondary transmission station 10 measured by the monitoring station 11 is held in the measurement result storage unit 104 for each frequency / time.
- the path loss correction unit 106 corrects the path loss estimated value between the secondary transmitting station 10 and the primary receiving station to be protected (primary receiving station 21_6 in the example of FIG. 2). At this time, actual measurement correction using the received power measurement value of the secondary signal is performed.
- the received power measurement value of the secondary signal the received power of the secondary signal transmitted at a frequency different from the frequency used in the primary receiving station 21_6 to be protected and measured by the monitoring station 11 or the primary sound to be protected The reception power transmitted at a time different from the time used by the reception station 21_6 and measured by the monitoring station 11 is used.
- the received power measurement value of the primary signal the received power measured from the primary transmitting station 20 at a frequency different from the frequency used by the secondary transmitting station 10 and measured by the monitoring station 11 or the same frequency is used. Also, the reception power transmitted from the primary transmission station 20 at a time different from the time used by the secondary transmission station 10 and measured by the monitoring station 11 is used.
- the receiving station to be protected is the primary receiving station 21_6.
- the path loss correction unit 106 corrects the path loss estimated value between the secondary transmitting station 10 and the primary receiving station 21_6, the received power of the secondary signal transmitted at a frequency different from the frequency f6 and measured by the monitoring station 11 A measured value or a received power measurement value of a secondary signal that is transmitted at a time different from a time at which the primary signal is transmitted even at the frequency f6 (that is, a time when the primary signal is not transmitted) and measured by the monitoring station 11 Is used for path loss correction.
- the primary transmission station 20_6 when the secondary transmission station 10 is transmitting at the frequency f6, when the path loss correction unit 106 corrects the path loss estimated value between the primary transmission station 20_6 and the primary reception station 21_6, the primary transmission station 20_6 This is the frequency to be used, transmitted at a frequency different from f6 (f13 in the example of FIG. 2), and the received power measurement value of the primary signal measured by the monitoring station 11, or the secondary signal even at frequency f6 The received power measurement value of the secondary signal transmitted at a time different from the transmitted time and measured by the monitoring station 11 is used for path loss correction.
- the path loss correcting unit 106 corrects the path loss estimation value between the secondary transmitting station 10 and the primary receiving station 21_6, and receives the secondary signal received power at a plurality of frequencies including the frequency used by the primary receiving station 21_6.
- the measurement accuracy is high from the measurement accuracy information.
- the measurement accuracy information for the received power value of the secondary signal the received power estimated value of the primary signal in the monitoring station 11 calculated using the propagation model is used, and the received power estimated value of the primary signal is the minimum.
- the received power measurement value of the signal is used for the actual measurement correction.
- the actual measurement correction method corrects the path loss estimated value from the secondary transmitting station 10 to the primary receiving station 21_6 using a difference value between the received power estimated value of the secondary signal and the received power estimated value of the secondary signal as a correction value.
- the path loss correction unit 106 corrects the path loss estimated value between the primary transmitting station 20 and the primary receiving station 21_6, primary received power measurement at a plurality of frequencies including the frequency used by the secondary transmitting station 10 is performed.
- the result is available, or when the primary reception power measurement result at a plurality of times including the time used by the secondary transmitting station 10 is available, it is determined that the measurement accuracy is high from the measurement accuracy information as described above.
- the received power correction value is used.
- the measurement accuracy information for the received power value of the primary signal in this case, the received power estimated value of the secondary signal in the monitoring station 11 calculated using the propagation model is used, and the received power estimated value of the secondary signal is minimized.
- the received power measurement value of the primary signal is used for the actual measurement correction.
- the actual measurement correction method corrects the path loss estimated value to the primary transmitting station 20 and the primary receiving station 21 by using a difference value between the received power estimated value of the primary signal and the received power estimated value of the primary signal as a correction value.
- the measurement result storage unit 104 for each frequency / time stores measurement results for each measurement frequency (f4, f5, f6).
- the estimated received power value of the primary signal at the frequency f4 is the smallest, and the received power measurement value of the secondary signal at the frequency f4 is the highest. In such a case, the received power measurement value of the secondary signal at the frequency f4 is used for path loss correction.
- the value is about 0, the smallest.
- the accuracy of the received power measurement value of the secondary signal at the measurement time t1 is the highest, and the received power measurement value of the secondary signal at the time t1 is used for path loss correction.
- the received power estimated value of the primary signal used as measurement accuracy information.
- the ratio of the received power of the secondary signal among the signals included in the same band can be increased, so that the measurement error can be reduced.
- the received power measurement of the primary signal with the minimum received power estimated value of the secondary signal used as measurement accuracy information is performed. By using the value for correction of the path loss estimated value, the ratio of the received power of the primary signal among the signals included in the same band can be increased, so that the measurement error can be reduced.
- the received power estimation value of the primary signal is used as the measurement accuracy information of the received power measurement value of the secondary signal.
- the reception of the primary signal measured by the monitoring station 11 is used. Power measurements may be used.
- the estimated received power value of the primary signal is used as measurement accuracy information
- the measured received power value of the secondary signal having the smallest received power value of the primary signal is used for the actual measurement correction. Since the ratio of the received power of the secondary signal among the signals included in the same band can be increased, the measurement error can be reduced.
- a reception power estimated value of the secondary signal at the monitoring station 11 may be used. In this case, since the received power measurement value of the secondary signal having a large estimated received power value of the secondary signal is expected to have a large actual received power, the measurement error can be reduced by using this measured value for the actual correction. it can.
- the reception power estimation value of the secondary signal is used as the measurement accuracy information of the reception power measurement value of the primary signal.
- the secondary signal measured by the monitoring station 11 is used as another measurement accuracy information.
- the received power measurement value may be used. Even in this case, the received power measurement value of the primary signal having the smallest received power measurement value of the secondary signal is used for the actual measurement correction in the same manner as when the estimated received power value of the secondary signal is used as the measurement accuracy information. Since the ratio of the received power of the primary signal among the signals included in the same band can be increased, the measurement error can be reduced.
- the received power estimated value of the primary signal at the monitoring station 11 may be used as other measurement accuracy information. In this case, it is expected that the received power measurement value of the primary signal having a large estimated received power value of the primary signal also has a large actual received power. Therefore, the measurement error can be reduced by using this measured value for the actual correction. it can.
- the received power estimated value of the primary signal may be used.
- the ratio of the received power of the primary signal among the signals included in the same band can be increased. Measurement error can be reduced.
- the path loss correction unit 106 uses the measurement result determined to have high measurement accuracy, the estimated path loss from the secondary transmission station 10 to the primary reception station 21_6, and the primary transmission station 20 and the primary reception station 21_6.
- the path loss estimated value during is actually corrected.
- amendment of the path loss estimated value between the secondary transmission station 10 and the primary receiving station 21_6 is demonstrated.
- I Mon Meas be the received power measurement value of the secondary signal at the monitoring station 11 at the frequency (or time) at which the estimated received power value of the primary signal is minimum.
- a correction value ⁇ for actually correcting the estimated value of the path loss from the secondary transmitting station 10 to the primary receiving station 21_6 is calculated.
- This correction value ⁇ is calculated as a difference value between the measured received power value of the secondary signal and the estimated received power value of the secondary signal, as in the following equation.
- I Mon Est is the estimated received power value of the secondary signal at the monitoring station 11 at the frequency (or time) at which the estimated received power value of the primary signal is minimum.
- the path loss estimation correction value ⁇ can be stored in the frequency-specific / time-specific measurement result storage unit 104.
- This correction value ⁇ is used for correcting the path loss estimated value between the secondary transmitting station 10 and the primary receiving station 21_6. Specifically, correction is performed by the following equation.
- L Sec-Pri is a path loss estimated value at the frequency f6 from the secondary transmitting station 10 to the primary receiving station 21_6
- L ′ Sec-Pri is a corrected path loss estimated value
- w is a weight coefficient ( 0 ⁇ w ⁇ 1).
- the weighting factor w is determined according to the correlation of the propagation environment between the monitoring station 11 and the secondary transmission station 10, for example. For example, when the distance between the monitoring station 11 and the secondary transmission station 10 is far and the correlation of the propagation environment is low, the weight is reduced, and conversely, when the distance is close, the weight is increased to reflect the correction value more.
- the weighting factor w includes a propagation environment due to a frequency difference between the frequency of the measurement result used for calculating the correction value (measurement frequency) and the frequency of the path loss estimated value to be corrected (secondary use candidate frequency). May be reflected.
- the weighting factor w when the frequency difference increases, the weighting factor w can be reduced because the correlation of the propagation environment decreases, and when the frequency difference is small, the correlation of the propagation environment increases and the weighting factor w can be increased.
- the weighting factor w reflects the correlation of the propagation environment due to the time difference between the time of the measurement result used for calculating the correction value (measurement time) and the time when the secondary usage is actually performed (for example, the current time). May be. This is because, for example, the path loss varies depending on the time, such as radio wave reflection by the ionosphere is different between day and night, so the weighting factor w may be determined according to the time difference between the measurement time and the current time.
- the corrected path loss estimated value obtained as described above is output from the path loss correction unit 106 to the allowable transmission power setting unit 107.
- the correction of the above path loss estimated value is applicable not only to the path loss estimated value from the secondary transmitting station 10 to the single primary receiving station 21_6 but also to each path loss estimated value to a plurality of primary receiving stations. is there.
- the primary system service area 22 (22_1 to 22_7) to be subject to interference protection in FIG. 2 is divided into a lattice shape (for example, 100 m ⁇ 100 m), and the primary system service areas 22 (22 — 1 to 22 — 7) Assuming that there is a receiving station 21, the path loss to the plurality of primary receiving stations 21 is estimated, and actual measurement correction is performed. At this time, the measurement result used for correcting the path loss estimated value to each primary receiving station 21 does not need to be the measurement result obtained by the single monitoring station 11, and the distance to each primary receiving station 21 is individual. The measurement results measured at the monitoring stations can be used. Further, the actual measurement correction of the path loss estimated value can be performed using the measurement results measured by the plurality of monitoring stations 11.
- a lattice shape for example, 100 m ⁇ 100 m
- the primary system service areas 22 (22 — 1 to 22 — 7) Assuming that there is a receiving station 21, the path loss to the plurality of primary receiving stations 21 is estimated, and actual
- the above description is a case where the actual measurement correction of the path loss estimated value between the secondary transmitting station 10 and the primary receiving station 21_6 is performed. Similarly, the path loss estimation between the primary transmitting station 20_6 and the primary receiving station 21_6 is performed. The value can be corrected by actual measurement. In this case, the received power measurement value of the primary signal stored in the frequency-specific / time-specific measurement result storage unit 104 is used as the measurement result.
- the primary signal here is a signal transmitted from a primary transmitting station (for example, 20_6 in FIG. 2) that is transmitting to the primary receiving station 21 to be protected, and is in a different position. Is not the primary signal transmitted by the primary transmitting station (for example, 20_1 to 20_5, 20_7 in FIG. 2).
- the path loss correction unit 106 performs path loss correction using the actually measured values.
- Each corrected path loss estimated value (path loss estimated value between secondary transmitting station 10 and primary receiving station 21_6, path loss estimated value between primary transmitting station 20_6 and primary receiving station 21_6) is allowed from path loss correcting section 106. It is sent to transmission power setting section 107.
- the allowable transmission power setting unit 107 sets the allowable transmission power P Sec, Max as follows using these corrected path loss estimated values.
- P Pri is the transmission power of the primary transmission station 20_6 using the secondary usage candidate frequency
- G Pri Tx is the transmission antenna gain of the primary transmission station 20_6
- L ′ Pri-Pri is the primary transmission station 20_6 to the primary reception station 21_6.
- the corrected path loss estimated value L ′ Sec-Pri is the corrected path loss estimated value from the secondary transmitting station 10 to the primary receiving station 21_6.
- G Pri-Pri Rx and G Sec-Pri Rx are reception antenna gains of the primary receiving station 21, and are a gain in the arrival direction of the primary signal and a gain in the arrival direction of the secondary signal, respectively.
- the arrival direction of each signal is calculated based on the positional relationship between the primary receiving station 21 and the primary transmitting station 20 and the positional relationship between the primary receiving station 21 and the secondary transmitting station 10 to calculate the antenna gain.
- the CIR req is a CIR required for protection of the primary receiving station 21_6 and is determined for each primary system. Furthermore, ⁇ is a standard deviation regarding the CIR estimation error when it is assumed that the corrected path loss estimated value is used, and q is a coefficient corresponding to the probability that the required CIR can be secured. Therefore, q ⁇ corresponds to a margin provided in the allowable transmission power so that the CIR of the primary receiving station 21_6 can satisfy the required CIR with a predetermined probability. Note that the value of q is 1.645, for example, when the required CIR is secured at 95% when the CIR estimation error is a Gaussian distribution.
- Formula (4) is the allowable transmission power for securing the required CIR with a predetermined probability in the single primary receiving station 21_6 that uses the secondary usage candidate frequency.
- the allowable transmission power of the equation (4) is calculated for each primary receiving station 21_6, and the minimum value among them is finally determined.
- the allowable transmission power can also be set.
- the permissible transmission power thus obtained is sent to the secondary transmission station 10 via the core network 14, and the secondary transmission station 10 sets a transmission power that is equal to or less than the permissible transmission power.
- FIG. 8 is a block diagram illustrating a configuration example of the monitoring station 11.
- the monitoring station 11 includes a network communication unit 151, a measurement frequency setting unit 152, a reception RF unit 153, and a reception power measurement unit 154.
- components that are not directly related to the present invention for example, a circuit that performs wireless communication between a base station and a terminal when the monitoring station 11 is a base station) are omitted for the sake of clarity. ing.
- the network communication unit 151 is used for the monitoring station 11 to communicate with other devices (for example, the spectrum manager 12) via the core network 14.
- the measurement frequency setting unit 152 receives a measurement request from the spectrum manager via the core network 14. Subsequently, the measurement frequency setting unit 152 outputs the frequency (measurement frequency) for which the measurement request has been received to the reception RF unit 153.
- the “measurement frequency” is a frequency for measuring a signal transmitted from the secondary transmission station 10 or the primary transmission station 20, and the frequency of the downlink signal transmitted to the terminal to which the monitoring station 11 belongs as a base station, This is different from the frequency of the uplink signal received from the terminal.
- the measurement frequency specified in the measurement request may be set such that the frequency for measuring the secondary signal and the frequency for measuring the primary signal can be set separately.
- the reception RF unit 153 includes a band-pass filter, a low noise amplifier, a frequency conversion unit that performs frequency conversion between a radio frequency (RF) band signal and a baseband signal, an A / D conversion unit (Analog to Digital conversion unit), and the like. Is provided inside.
- the frequency (center frequency, frequency bandwidth) of the bandpass filter is set by the measurement frequency setting unit 152, and reception of radio waves outside the measurement frequency band is limited in the radio signal input from the antenna. To do.
- the reception RF unit 153 further converts the extracted signal in the measurement frequency band into a digital baseband signal and outputs the digital baseband signal to the reception power measurement unit 154.
- an RF signal or an IF (Intermediate Frequency) signal may be input depending on the measurement method of the reception power measurement unit 154.
- the reception power measurement unit 154 receives the digital baseband signal of the measurement frequency from the reception RF unit 153 and calculates the reception power of the measurement target signal.
- the measurement target signal is a secondary signal or a primary signal.
- any method may be used as long as it can measure the received power of the secondary signal or the received power of the primary signal.
- a signal to be measured for example, a secondary signal
- the received power of the measurement frequency is directly measured, and the frequency band
- the received power of the signal to be measured can be measured by subtracting the noise power contained therein.
- a method of measuring the power of each signal separately is used.
- a power measurement method using a cross-correlation value obtained by a sliding correlation between a pilot signal of a measurement target signal and a reception signal can be used. Specifically, a correlation value is calculated by sliding correlation between the actually received pilot signal and the known pilot signal, a maximum correlation value is obtained, and the received power of the pilot signal is estimated from the value.
- the reception power of the pilot signal can be calculated by preliminarily holding a table representing the correspondence between the maximum correlation value and the reception power of the pilot signal, and searching the table using the obtained maximum correlation value as a key.
- the monitoring station 11 determines the reception power of the measurement target signal from the reception power of the pilot signal. It can also be estimated. For example, the ratio of the pilot signal transmission power to the total transmission power can be used by notifying the monitoring station 11 from the secondary transmission station 10 via the core network 14.
- the reception power of the pilot signal is sent to the spectrum manager 12, and the spectrum manager 12 obtains the ratio of the pilot signal transmission power to the total transmission power from the secondary transmission station 10, and the reception power of the measurement target signal is obtained from the pilot signal reception power. It is also possible to calculate the correction value of the path loss estimated value using this value.
- FIG. 9 is a conceptual diagram for explaining the sliding correlation.
- the vertical axis represents the subcarrier (frequency), and the horizontal axis represents the symbol (time).
- the upper row shows the received signal, and the lower row shows the RS (Reference Signal) after time domain conversion.
- the spectrum manager 12 sends a monitoring request to the monitoring station that requests monitoring.
- the cell ID (Identification) of the secondary transmitting station 10 is notified.
- the monitoring station 11 generates an RS corresponding to the notified cell ID (Reference ⁇ ⁇ ⁇ ⁇ ⁇ Signal: a known pilot signal used for channel estimation or the like, which is associated with the cell ID), and further converts this into time. Convert to area.
- the monitoring station 11 performs sliding correlation using the RS in the time domain according to the following equation.
- the monitoring station 11 calculates the maximum correlation value T max from the sliding correlation between the complex conjugate (i * p (k)) of the RS signal after time domain conversion and the received signal (y (n + k)) according to the calculation formula shown in Equation 5. And the above table is searched using the maximum correlation value as a key to obtain the pilot received power.
- K represents the RS sequence length in the time domain.
- the monitoring station 11 transmits the received power measurement value of the pilot signal calculated as described above (or the received power of the measurement target signal) to the spectrum manager 12.
- FIG. 10 is a flowchart showing an operation example of the spectrum manager 12.
- the network communication unit 101 of the spectrum manager 12 receives information (transmission power, frequency, time, cell ID, etc.) on the frequency being used or scheduled to be used sent from the secondary transmission station 10 or sent from the monitoring station 11.
- Measurement result (reception power measurement value of secondary signal, reception power measurement value of primary signal) or secondary usage request (including information such as frequency and time) sent from secondary transmission station 10 is received. (Step S10).
- the monitoring station determination unit 102 of the spectrum manager 12 determines and determines the monitoring station 11 that performs measurement. A measurement request is transmitted to the monitoring station 11 (step S11).
- the path loss correction in the spectrum manager 12 is performed by receiving the secondary signal measured by the monitoring station 11 at the frequency (or time) used by the primary receiving station 21 to be protected when the secondary transmitting station 10 transmits.
- the reception power measurement value of the secondary signal measured by the monitoring station 11 at another frequency (or another time) such as the adjacent frequency is used.
- the spectrum manager 12 can detect the signal of the secondary transmission station 10 not only in the monitoring station 11 in the primary system service area 22 where the transmission of the secondary transmission station 10 causes interference, but also in the monitoring station in the service area of another frequency. Measure the received power.
- the secondary transmitting station 10 since the secondary transmitting station 10 uses the frequency f6, it causes interference to the primary system service area 22_6.
- the primary system service areas 22_1 to 22_5 , 22_7 monitoring power (not shown in FIG. 2) also measures the received power of the secondary signal of frequency f6. This measurement of received power may be performed in all applicable monitoring stations.
- a monitoring station a monitoring station located in the vicinity of each primary receiving station shown in FIG. 2 located in an area where the influence of interference is large in the service area of each frequency may be performed.
- the reception power of the secondary signal transmitted at the frequency f6 the reception power of the secondary signal transmitted from the secondary transmission station 10 can be measured in advance, and the primary transmission stations (20_1 to 20_1 to 20) in each service area can be measured in advance.
- the received power of the primary signal transmitted from each frequency f1 to f5, f7 to f14
- the secondary transmitting station 10 uses the frequencies f1 to f5 and f7 to f14, the received power measurement value of the secondary signal previously measured at the frequency f6 and the primary signal measured at the frequencies f1 to f5 and f7 to f14 are used.
- the actual measurement correction of the path loss estimated value can be performed using the received power measured value.
- the measurement accuracy calculation unit 103 of the spectrum manager 12 is used. Calculates measurement accuracy information for the measurement result (step S12).
- the measurement accuracy information of the reception power measurement value of the secondary signal is the reception power estimation value of the primary signal
- the measurement accuracy information of the reception power measurement value of the primary signal is the reception power estimation value of the secondary signal.
- the measurement accuracy calculation unit 103 stores the calculated measurement result, measurement accuracy information, measurement frequency, and measurement time information in the frequency / time measurement result storage unit 104 (step S13).
- the path loss estimation unit 105 determines that the influence of interference is large when using the secondary usage candidate frequency.
- the primary receiving station 21 is identified and the path loss between the transmitting and receiving stations (path loss between the secondary transmitting station and the primary receiving station or the path loss between the primary transmitting station and the primary receiving station) is estimated using the propagation model (step S14).
- the path loss correction unit 106 performs actual measurement correction of the path loss estimated value between the secondary transmitting station 10 and the primary receiving station 21 calculated in step S14.
- the monitoring station 11 located around the primary receiving station 21 to be protected is specified.
- the received power used for correcting the path loss between the secondary transmitting station 10 and the primary receiving station 21 is different from the frequency used in the primary receiving station 21 to be protected. It is assumed that the received power of the measured secondary signal or the received power measured at a time different from the time used by the primary receiving station 21 to be protected.
- the received power measurement value of the secondary signal measured at the adjacent frequency (adjacent channel) of the frequency used by the primary receiving station 21 to be protected is used for path loss correction.
- the reception power measurement result of the secondary signal measured at a plurality of frequencies including the frequency used at the primary receiving station 21 is available, or at a plurality of times including the time used at the primary receiving station 21.
- the reception power measurement value of the secondary signal determined to have high measurement accuracy from the measurement accuracy information is used.
- the path loss correction unit 106 receives the measured received power value of the secondary signal and the estimated received power value of the secondary signal in the monitoring station 11 calculated based on the path loss estimation (the estimated path loss value between the secondary transmitting station 10 and the monitoring station 11).
- the path loss estimated value calculated in step S14 is corrected using the difference from the received power estimated value of the secondary signal calculated based on the correction value (step S15).
- the path loss correcting unit 106 measures the primary measured by the monitoring station 11 specified above. It is searched whether the received power measurement value of the signal of the transmitting station 20 is held in the measurement result storage unit 104 for each frequency and time.
- the received power used for correcting the path loss is a frequency different from the frequency used for the secondary transmission station (secondary transmission station 10 or another secondary transmission station), Or it is set as the reception power of the primary signal measured in the frequency different from the time currently used by the secondary transmission station.
- the path loss correction unit 106 uses the received power measurement value of the primary signal that is determined to have high measurement accuracy from the measurement accuracy information.
- the path loss correction unit 106 receives the primary signal reception power measurement value and the primary signal reception power estimation value calculated based on the path loss estimation (the primary loss calculated based on the path loss estimation value between the primary transmitting station 20 and the monitoring station 11).
- the path loss estimated value calculated in step S14 is corrected using the difference from the signal received power estimated value) as a correction value.
- the allowable transmission power setting unit 107 calculates the corrected path loss estimated value between the secondary transmitting station 10 and the primary receiving station 21, and the corrected path loss estimated value between the primary transmitting station 20 and the primary receiving station 21. Is used to calculate the allowable transmission power of the secondary transmission station 10.
- the permissible transmission power thus obtained is sent to the secondary transmission station 10 via the core network 14, and the secondary transmission station 10 sets a transmission power that is equal to or less than the permissible transmission power (step S16).
- FIG. 11 is a flowchart showing an operation example of the monitoring station 11.
- the network communication unit 151 of the monitoring station 11 receives a measurement request from the spectrum manager 12 (step S20).
- the measurement frequency setting unit 152 of the monitoring station 11 sets the pass band of the band pass filter of the reception RF unit 153 to the frequency in order to receive the radio signal of the frequency specified in the measurement request (step S21). ).
- the monitoring station 11 receives a radio signal from the antenna, and the reception RF unit 153 converts the radio signal having the frequency to be measured into a digital baseband signal (step S22). Then, the received power measuring unit 154 of the monitoring station 11 measures the received power of the secondary signal and the received power of the primary signal using the digital baseband signal to be measured, and the network communication unit 151 and the core network 14 are connected. To the spectrum manager 12 (step S23).
- the path loss value is estimated at the first frequency, and the same frequency band as the secondary signal.
- the received power of the secondary signal measured by the monitoring station over time is used for the actual measurement correction of the path loss.
- the measurement is performed in an environment where the received power of the other signals is small compared to the case where the received power of the secondary signal is measured using the first frequency used in the primary system service area around the monitoring station. Measurement error of the received power of the secondary signal can be reduced. That is, the path loss estimated value in the propagation path from the secondary transmitting station to the primary receiving station can be actually measured and corrected with higher accuracy.
- the path loss value is estimated at yet another third frequency, and signals other than the measurement target (secondary signal) are received.
- the monitoring station measures the received power of the primary signal at another frequency (fourth frequency) with low power or at time.
- measurement can be performed in an environment where the received power of signals other than the measurement target is small, and the measurement error of the received power of the secondary signal is reduced. That is, the path loss estimated value in the propagation path from the primary transmitting station to the primary receiving station can be actually measured and corrected with higher accuracy.
- the CIR estimation error can be reduced, and the margin necessary for setting the allowable transmission power of the secondary transmission station can be further reduced, so that the allowable transmission power can be increased.
- the CIR of the primary receiving station is used as the reception quality for setting the allowable transmission power.
- setting the allowable transmission power so that the CINR is not less than a predetermined value It is also possible to set the allowable transmission power so that the amount of interference is less than or equal to a predetermined value.
- the allowable transmission power can be set so that the degree of deterioration of the CIR or CINR of the primary receiving station caused by transmission at the secondary transmitting station is suppressed to a predetermined value or less.
- the first embodiment of the present invention is not limited to interference between the same channels (frequencies), but also out-of-band leakage to a frequency adjacent to (or adjacent to) the transmission frequency of the secondary transmission station, Also consider interference between adjacent channels (frequency sharing for adjacent channels with the primary system) due to the adjacent channel selectivity of the reception filter of the receiving station (the nature of the reception filter that captures signals up to the frequency adjacent to the desired frequency) be able to.
- the allowable transmission power when considering interference between adjacent channels is the reception power of the primary signal at the frequency of the primary reception station and the secondary signal at the primary reception station at a frequency adjacent to the frequency of the primary reception station. Interference between adjacent channels is avoided by determining the ratio with the received power as the reception quality and keeping the reception quality at a predetermined value or higher.
- the monitoring station uses a frequency different from the frequency used in the primary receiving station (for example, the frequency used in the primary receiving station). Of the secondary signal and the frequency at which the secondary signal is transmitted, and at a frequency different from the frequency at which the secondary signal is transmitted (for example, the frequency used in the primary receiving station).
- the frequency used by the primary receiving station to be protected is a frequency (time) different from the first frequency (time) that is a frequency for estimating the path loss.
- the measured received power of the secondary signal is used for path loss correction, the following other forms are possible.
- the received power of the secondary signal measured at a frequency different from each frequency corresponding to the service area may be used for path loss correction with respect to the frequency where the primary receiving station to be protected is within the service area. .
- the primary receiving station 21_6 since the primary receiving station 21_6 is located in the service area of f6 and f13, this corresponds to measurement at the frequency of the primary system other than f6 and f13.
- the service area in this case may be a service area of a plurality of primary transmission stations, and it is not necessary to target only the service area of a single primary transmission station. If the primary receiving station to be protected and the monitoring station are in different service areas, the received power of the secondary signal measured at a frequency different from the frequency included in the service area by the monitoring station is corrected for path loss. You may use for. Furthermore, the following forms are also possible. For example, the reception power of the secondary signal measured at a frequency different from each frequency used in the primary transmission station with respect to a single or a plurality of primary transmission stations having the protected primary reception station in the service area Can also be used for path loss correction.
- the second embodiment of the present invention differs from the first embodiment in the measurement accuracy information used for correcting the path loss estimated value.
- the ratio of the received signal power estimated value to be measured and the received power estimated value of other signals is Use measurement accuracy information. For the sake of clarity, only differences from the first embodiment will be described.
- the measurement accuracy information of the received power measurement value of the secondary signal is an ICR that is a ratio between the received power estimate value of the secondary signal calculated based on the path loss estimation and the received power estimate value of the primary signal. (Interference to Carrier Ratio).
- the measurement accuracy information of the received power measurement value of the primary signal is a CIR estimated value that is a ratio between the received power estimated value of the primary signal calculated based on the path loss estimation and the received power estimated value of the secondary signal.
- FIG. 12 is an example of frequency-specific measurement results held in the frequency-specific / time-specific measurement result storage unit 104 according to the second embodiment of the present invention. This measurement result is held for each combination of the secondary transmission station 10 and the monitoring station 11.
- the measurement results of the measurement frequencies f4, f5, f6, and f13 are shown as in FIG.
- the measurement results are the received power measurement value of the secondary signal and the received power measurement value of the primary signal.
- the ICR estimated value used as the measurement accuracy information of the received power measurement value of the secondary signal is the same as in the first embodiment, and the received power estimate value of the secondary signal and the received power estimate value of the primary signal are calculated. If the received power is displayed in dBm, it is defined as a difference. Then, when the ICR estimation value is high, it is determined that the received power measurement value has high measurement accuracy.
- the measurement accuracy information of the received power measurement value of the primary signal is a CIR estimated value that is a value obtained by inverting the sign of the ICR estimated value in dB display (CIR estimated value that is the reciprocal of the ICR estimated value in true value display). ). In this case, when the CIR estimation value is high, it is determined that the received power measurement value has high measurement accuracy.
- 13A and 13B show examples of the received power estimated value of the secondary signal and the received power estimated value of the primary signal in FIG. 12 for each measurement frequency.
- 13A and 13B show the received power estimation value of the secondary signal and the estimated received power of the primary signal assuming the arrangement of the secondary transmitting station 10, the monitoring station 11, and each primary transmitting station 20 (20_4, 20_5, 20_6) in FIG. It is an example of a value.
- the received power estimated value of the primary signal is the same as that in FIG. 5, the description is omitted, and the received power estimated value of the secondary signal is described.
- the distance to the service area end up to the frequency f5 is far and the path loss is larger than the distance to the service area end of the frequencies f4 and f6. Accordingly, since the allowable transmission power when the frequency f5 is used is maximized, the estimated reception power value of the secondary signal in the monitoring station 11 is also larger than the other frequencies (f4 and f6).
- the ICR estimated value that is the measurement accuracy information of the received power measurement value of the secondary signal in the second embodiment of the present invention
- the received power measurement value of the secondary signal of f5 is used for the actual measurement correction.
- the CIR estimated value which is the measurement accuracy information of the received power measurement value of the primary signal is similarly calculated from the received power estimate value of the secondary signal and the received power estimate value of the primary signal for the frequencies f6 and f13.
- the received power measurement value of the primary signal having the highest CIR estimation value is used for the actual measurement correction.
- the ICR estimation value is used as the measurement accuracy information of the received power measurement value of the secondary signal
- the CIR estimation value is used as the measurement accuracy information of the reception power measurement value of the primary signal.
- the received power estimated value of the other signal the received power estimated value of the secondary signal or the received power estimated value of the primary signal
- the received power of the signal to be measured is further increased. Since this can be taken into account, the measurement error can be further reduced.
- the measurement accuracy information may be an ICNR (Interference-to-Carrier-Plus-Noise-Ratio) estimated value or a CINR estimated value instead of the ICR estimated value or the CIR estimated value.
- ICNR Interference-to-Carrier-Plus-Noise-Ratio
- the path loss estimated value in the propagation path from the secondary transmitting station to the primary receiving station or the path loss estimated value in the propagation path from the primary transmitting station to the primary receiving station can be corrected with high accuracy. Power can be increased.
- the primary system and the secondary system may be different RATs (Radio Access Technology) or the same RAT.
- different RATs include, for example, a combination of a TV broadcast system and a cellular system as described above.
- the primary system can be a macro cell and the secondary system can be a femto cell installed therein.
- the spectrum manager and the monitoring station are part of the secondary system. However, these may be in another wireless system outside the secondary system.
- the spectrum manager, the geographic database, and the monitoring station may be a third system that provides frequency management based on path loss estimation and actual measurement correction to a plurality of secondary systems.
- first and second embodiments described above can also be embodied as predetermined hardware, for example, a circuit.
- the first and second embodiments described above can be controlled and operated by a computer circuit (for example, a CPU (Central Processing Unit)) (not shown) based on a control program.
- these control programs are stored in, for example, a storage medium (for example, a ROM (Read Only Memory) or a hard disk) or an external storage medium (for example, a removable medium or a removable disk). And read and executed by the computer circuit.
- the path loss value can be estimated accurately.
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Abstract
Description
<第1の実施形態>
図1は、本発明の第1の実施形態に係るコグニティブ無線システムの一例を示すシステム構成図である。コグニティブ無線システムは、セカンダリシステムとしてプライマリシステムと周波数を共用して通信を行う。以下では、プライマリシステムがTV放送システムであり、セカンダリシステムがセルラーシステムである場合を例として想定する。もちろん、この構成は単なる一例であって、プライマリシステム及びセカンダリシステムの組み合わせは、このような構成に限定されない。プライマリシステム及びセカンダリシステムの組み合わせは、例えば、TVシステムとWRAN(Wireless Regional Access Network)システムの組み合わせ、TVシステムと自治体等の地域無線や防災無線との組み合わせとすることができる。その他の例では、プライマリシステムがワイヤレスマイクや特定用途無線(例えば、集合住宅用無線、企業内自営無線、農業用無線等)であってもよいし、セカンダリシステムが無線LAN(Local Area Network)であってもよい。また、本発明の第1の実施形態の構成は、プライマリシステムとセカンダリシステムといった周波数利用時の優先順位が異なる無線システムの組合せのみに必ずしも限定されるわけでなく、優先順位が同列な無線システムにおいて周波数を共用することを想定した構成であってもよい。
以下では、セカンダリ送信局10及びモニタリング局11が基地局であって、コアネットワークを利用可能である場合を例に説明をする。また、図1では、モニタリング局11を一つのみ図示したが、セルラーシステムの基地局のように、複数のモニタリング局が面的に配置されているものとする。
次に、パスロス補正部106は、モニタリング局11によって測定されたセカンダリ送信局10の受信電力の測定結果が周波数別・時間別測定結果記憶部104に保持されているかサーチする。
補正後の各パスロス推定値(セカンダリ送信局10とプライマリ受信局21_6との間のパスロス推定値、プライマリ送信局20_6とプライマリ受信局21_6との間のパスロス推定値)は、パスロス補正部106から許容送信電力設定部107へ送られる。
こうして得られた許容送信電力は、コアネットワーク14を経由して、セカンダリ送信局10へ送られ、セカンダリ送信局10では許容送信電力以下となる送信電力を設定する(ステップS16)。
このような場合においても、本発明の第1の実施の形態の方法によれば、モニタリング局は、プライマリ受信局で使用される周波数とは別な周波数(例えば、プライマリ受信局で使用される周波数の隣接周波数であって、セカンダリ信号を送信する周波数)において、セカンダリ信号の受信電力の測定を行い、セカンダリ信号を送信する周波数とは別な周波数(例えば、プライマリ受信局で使用される周波数)においてプライマリ信号の受信電力を測定することで、各受信電力の測定誤差を軽減した測定を行うことができ、この測定結果を用いることでパスロス推定値をより精度よく実測補正することができる。
本発明の第2の実施形態は、パスロス推定値の補正に用いる測定精度情報が第1の実施形態と異なり、測定対象の受信信号電力推定値と、他の信号の受信電力推定値の比を測定精度情報とする。説明を明瞭にするため、第1の実施形態と異なる点についてのみ説明する。
11 モニタリング局
12 スペクトルマネージャ
13 地理データベース
14 コアネットワーク
20 プライマリ送信局
20_1 プライマリ送信局
20_2 プライマリ送信局
20_3 プライマリ送信局
20_4 プライマリ送信局
20_5 プライマリ送信局
20_6 プライマリ送信局
20_7 プライマリ送信局
21 プライマリ受信局
21_1 プライマリ受信局
21_2 プライマリ受信局
21_3 プライマリ受信局
21_4 プライマリ受信局
21_5 プライマリ受信局
21_6 プライマリ受信局
21_7 プライマリ受信局
22_1 プライマリシステムサービスエリア
22_2 プライマリシステムサービスエリア
22_3 プライマリシステムサービスエリア
22_4 プライマリシステムサービスエリア
22_5 プライマリシステムサービスエリア
22_6 プライマリシステムサービスエリア
22_7 プライマリシステムサービスエリア
101 ネットワーク通信部
102 モニタリング局決定部
103 測定精度算出部
104 周波数別・時間別測定結果記憶部
105 パスロス推定部
106 パスロス補正部
107 許容送信電力設定部
151 ネットワーク通信部
152 測定周波数設定部
153 受信用RF部
154 受信電力測定部
Claims (18)
- 自己の無線システムの送信局と他者の無線システムの送信局のサービスエリアに在圏する他者の無線システム受信局との間のパスロス値を第1の周波数で推定し、
前記第1の周波数とは異なる他者の無線システムの送信局の第2の周波数で送信された前記自己の無線システム送信局の無線信号の受信電力値、又は、前記他者の無線システムの送信局が前記第1の周波数を使用しない時間において送信された前記自己の無線システム送信局の無線信号の受信電力値を、前記サービスエリア及びその周辺のモニタリング局にて測定し、
前記自己の無線システム信号の受信電力の測定値を用いて前記推定されたパスロス値を補正するパスロス算出方法。 - 自己の無線システムの送信局と他者の無線システムの送信局のサービスエリアに在圏する他者の無線システム受信局との間のパスロス値を第1の周波数で推定するパスロス推定部と、
前記第1の周波数とは異なる他者の無線システムの送信局の第2の周波数で送信された前記自己の無線システム送信局の無線信号の受信電力の測定値、又は、前記他者の無線システムの送信局が前記第1の周波数を使用しない時間において送信された前記自己の無線システム送信局の無線信号の受信電力の測定値のいずれかを用いて、前記推定されたパスロス値を補正するパスロス補正部を備えたパスロス算出装置。 - 自己の無線システムの送信局と他者の無線システムの送信局のサービスエリアに在圏する他者の無線システム受信局との間のパスロス値を第1の周波数で推定するステップと、
前記サービスエリア及びその周辺のモニタリング局で測定された、前記第1の周波数とは異なる他者の無線システムの送信局の第2の周波数で送信された前記自己の無線システム送信局の無線信号の受信電力の測定値、又は、前記他者の無線システムの送信局が前記第1の周波数を使用しない時間において送信された前記自己の無線システム送信局の無線信号の受信電力の測定値を用いて前記推定されたパスロス値を補正するステップとを含むコンピュータにより実行可能なパスロス算出プログラム。 - プライマリシステムの送信局の周波数と同一周波数をセカンダリシステムで共用し、前記セカンダリシステムの送信信号が前記プライマリシステムに干渉を与えないように、前記セカンダリシステムの送信信号の許容電力を制御するようにした無線通信システムであって、
前記プライマリシステムは、少なくとも、プライマリシステムの送信局と、プライマリシステムの受信局とを含み、
前記セカンダリシステムは、少なくとも、セカンダリシステムの送信局と、前記セカンダリシステムの送信局からの送信信号を管理するスペクトルマネージャと、前記プライマリシステムの送信局のサービスエリア及びその周辺に位置して前記セカンダリシステムの送信局からの送信信号の受信電力を測定するモニタリング局とを含み、
前記スペクトルマネージャは、前記セカンダリシステムの送信局と前記プライマリシステムの受信局との間のパスロス値を第1の周波数で推定し、前記第1の周波数とは異なるプライマリシステムの送信局の第2の周波数で送信された前記セカンダリシステム送信局の無線信号の受信電力値、又は、前記プライマリシステムの送信局が前記第1の周波数を使用しない時間において送信された前記セカンダリシステムの送信局からの送信信号の受信電力値を用いて、前記推定されたセカンダリシステムの送信局とプライマリシステムの受信局との間のパスロス値を補正し、前記補正後のパスロス値を用いて、前記セカンダリシステムの送信局の許容送信電力を算出する無線通信システム。 - 前記モニタリング局は、更に、前記プライマリシステムの送信局からの送信信号の受信電力を測定し、
前記スペクトルマネージャは、更に、前記プライマリシステムの送信局と前記プライマリシステムの受信局との間のパスロス値を第3の周波数で推定し、前記第3の周波数とは異なる前記セカンダリシステムの送信局の第4の周波数で送信された前記プライマリシステムの送信局の無線信号の受信電力値、又は、前記セカンダリシステムの送信局が前記第3の周波数を使用しない時間において送信された前記プライマリシステムの送信局からの送信信号の受信電力値を用いて、前記推定されたプライマリシステムの送信局とプライマリシステムの受信局との間のパスロス値を補正する請求項4に記載の無線通信システム。 - プライマリシステムの送信局の周波数と同一周波数を共用するセカンダリシステムを管理するスペクトルマネージャであって、
前記プライマリシステムの送信局のサービスエリア及びその周辺に位置するモニタリング局が測定した受信電力値を受信する通信部と、
前記セカンダリシステムの送信局と前記プライマリシステムの受信局との間のパスロス値を第1の周波数で推定するパスロス推定部と、
前記モニタリング局が測定した受信電力値を保持する測定結果記憶手段と、
前記第1の周波数とは異なるプライマリシステムの送信局の第2の周波数で送信された前記セカンダリシステムの送信局の無線信号の受信電力値、又は、前記プライマリシステムの送信局が前記第1の周波数を使用しない時間において送信された前記セカンダリシステムの送信局の無線信号の受信電力値を用いて、前記推定されたセカンダリシステムの送信局とプライマリシステムの受信局との間のパスロス値を補正するパスロス補正部と、
前記補正後のパスロス値を用いて、前記セカンダリシステムの送信局の許容送信電力を算出する許容電力設定部とを備えたスペクトルマネージャ。 - 前記測定結果記憶部は、複数の周波数毎に前記セカンダリシステムの送信局の無線信号の受信電力値を測定精度情報と対応付けて保持し、又は、複数の時間毎に前記セカンダリシステムの送信局の無線信号の受信電力値を測定精度情報と対応付けて保持し、
前記パスロス補正部は、前記複数の周波数毎に保持された前記セカンダリシステムの送信局の無線信号の受信電力値、又は、前記複数の時間毎に保持された前記セカンダリシステムの送信局の無線信号の受信電力値の中で、前記測定精度情報に基づいて測定精度の高い受信電力値を抽出し、前記測定精度の高い受信電力値を用いて、前記セカンダリシステムの送信局と前記プライマリシステムの受信局との間のパスロス推定値を補正する請求項6に記載のスペクトルマネージャ。 - 前記測定精度情報は、プライマリシステムの送信局から送信された無線信号の前記モニタリング局における受信電力の推定値であり、
前記パスロス補正部は、前記受信電力の推定値が小さいものに対応付けられたセカンダリシステムの送信局の無線信号の受信電力値をパスロス補正に用いる請求項7に記載のスペクトルマネージャ。 - 前記測定精度情報は、前記モニタリング局が測定した前記プライマリシステムの送信局から送信された無線信号の受信電力の測定値であり、
前記パスロス補正部は、前記受信電力の測定値が小さいものに対応付けられたセカンダリシステムの送信局の無線信号の受信電力値をパスロス補正に用いる請求項7に記載のスペクトルマネージャ。 - 前記測定精度情報は、前記セカンダリシステムの送信局から送信された無線信号の前記モニタリング局における受信電力の推定値であり、
前記パスロス補正部は、前記受信電力の推定値が大きいものに対応付けられたセカンダリシステムの送信局の無線信号の受信電力値をパスロス補正に用いる請求項7に記載のスペクトルマネージャ。 - 前記測定精度情報は、前記セカンダリシステムの送信局から送信された無線信号の前記モニタリング局における受信電力の推定値と前記プライマリシステムの送信局から送信された無線信号の前記モニタリング局における受信電力の推定値との電力比であり、
前記パスロス補正部は、前記電力比が大きいものに対応付けられたセカンダリシステムの送信局の無線信号の受信電力値をパスロス補正に用いる請求項7に記載のスペクトルマネージャ。 - 複数のモニタリング局の中から受信電力を測定させるモニタリング局を決定するモニタリング局決定部を,更に有し、
前記モニタリング局決定部は、受信電力を測定させるモニタリング局として、前記プライマリシステムの送信局の周波数のサービスエリア及びその周辺に位置するモニタリング局と、前記プライマリシステムの送信局の周波数とは異なる周波数のサービスエリアエリア及びその周辺に位置し、前記セカンダリシステムの送信局が前記他の周波数で送信する際に被干渉となるモニタリング局とを位置情報から特定する請求項6乃至11の何れかに記載のスペクトルマネージャ。 - 前記パスロス推定部は、更に、前記プライマリシステムの送信局と前記プライマリシステムの受信局との間のパスロス値を第3の周波数で推定し、
前記パスロス補正部は、前記第3の周波数とは異なるセカンダリシステムの送信局の第4の周波数で送信された前記プライマリシステム送信局の無線信号の受信電力値、又は、前記セカンダリシステムの送信局が前記第3の周波数を使用しない時間において送信された前記プライマリシステムの送信局の無線信号の受信電力値を用いて、前記推定されたプライマリシステムの送信局とプライマリシステムの受信局との間のパスロス値を補正する請求項6に記載のスペクトルマネージャ。 - 前記測定結果記憶部は、更に、複数の周波数毎に前記プライマリシステムの送信局の無線信号の受信電力値を測定精度情報と対応付けて保持し、又は、複数の時間毎に前記プライマリシステムの送信局の無線信号の受信電力値を測定精度情報と対応付けて保持し、
前記パスロス補正部は、前記複数の周波数毎に保持された前記プライマリシステムの送信局の無線信号の受信電力値、又は、前記複数の時間毎に保持された前記プライマリシステムの送信局の無線信号の受信電力値の中で、前記測定精度情報に基づいて測定精度の高い受信電力値を抽出し、前記測定精度の高い受信電力値を用いて、前記プライマリシステムの送信局と前記プライマリシステムの受信局との間のパスロス推定値を補正する請求項13に記載のスペクトルマネージャ。 - 前記測定精度情報は、セカンダリシステムの送信局から送信された無線信号の前記モニタリング局における受信電力の推定値であり、
前記パスロス補正部は、前記受信電力の推定値が小さいものに対応付けられたプライマリシステムの送信局の無線信号の受信電力値をパスロス補正に用いる請求項14に記載のスペクトルマネージャ。 - 前記測定精度情報は、前記モニタリング局が測定した前記セカンダリシステムの送信局から送信された無線信号の受信電力の測定値であり、
前記パスロス補正部は、前記受信電力の測定値が小さいものに対応付けられたプライマリシステムの送信局の無線信号の受信電力値をパスロス補正に用いる請求項14に記載のスペクトルマネージャ。 - 前記測定精度情報は、前記プライマリシステムの送信局から送信された無線信号の前記モニタリング局における受信電力の推定値であり、
前記パスロス補正部は、前記受信電力の推定値が大きいものに対応付けられたプライマリシステムの送信局の無線信号の受信電力値をパスロス補正に用いる請求項14に記載のスペクトルマネージャ。 - 前記測定精度情報は、前記プライマリシステムの送信局から送信された無線信号の前記モニタリング局における受信電力の推定値と前記セカンダリシステムの送信局から送信された無線信号の前記モニタリング局における受信電力の推定値との電力比であり、
前記パスロス補正部は、前記電力比が大きいものに対応付けられたプライマリシステムの送信局の無線信号の受信電力値をパスロス補正に用いる請求項14に記載のスペクトルマネージャ。
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