WO2006092856A1 - マルチキャリア通信方法及びそれに使用される基地局及び移動局 - Google Patents
マルチキャリア通信方法及びそれに使用される基地局及び移動局 Download PDFInfo
- Publication number
- WO2006092856A1 WO2006092856A1 PCT/JP2005/003492 JP2005003492W WO2006092856A1 WO 2006092856 A1 WO2006092856 A1 WO 2006092856A1 JP 2005003492 W JP2005003492 W JP 2005003492W WO 2006092856 A1 WO2006092856 A1 WO 2006092856A1
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- WIPO (PCT)
- Prior art keywords
- mobile station
- base station
- carrier
- carrier frequencies
- communication
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
Definitions
- Multi-carrier communication method and base station and mobile station used therefor
- the present invention relates to a multicarrier communication method and a base station and a mobile station used therefor, and discloses identification information of an object, and authenticates when referring to information of an object corresponding to the identification information from the identification information.
- the present invention relates to a multicarrier communication method for performing communication, and a base station and a mobile station used therefor.
- W-CDMA Wideband Code Division Multiple Access
- the multi-carrier communication system performs communication by dividing a frequency band defined around a carrier frequency into a plurality of bands (subcarriers). For this reason, the radio propagation path characteristics in each subcarrier are very similar.
- Patent Document 1 describes that quality deterioration is prevented when switching between 800 MHz band and 1.5 GHz band.
- Non-Patent Literature 1 Masaaki Shinji: “Radio Propagation of Wireless Communication”, IEICE, P230
- Non-Patent Literature 2 Yoshihisa Okumura, Masaaki Shinji: “Basics of Mobile Communications”, IEICE, P63 Patent Literature 1: Japanese Unexamined Patent Publication No. 7-87544
- the carrier frequency is 2 GHz and the bandwidth used (BW) is 5 MHz.
- W— CDMA will be explained using 4 multicarriers as an example.
- propagation loss which is one of radio propagation path characteristics. Further, the propagation loss (L) due to the distance (d) is expressed by the following equation (1) (see Non-Patent Document 1).
- fc Carrier frequency [MHz]
- h Base station antenna height [m]
- h Mobile station antenna
- the difference in propagation loss between f and f having the highest frequency difference is the difference between the base station and mobile station.
- the maximum Doppler frequency which is one of the radio propagation path characteristics.
- the maximum Doppler frequency (fd) is expressed by Equation (2) with respect to the moving speed (V) (see Non-Patent Document 2).
- ⁇ ⁇ / ⁇
- c speed of light (3.0 ⁇ 10 8 )
- fc carrier frequency
- the puller frequency is considered the same.
- the present invention has been made in view of the above points, and has as a general object to provide a multi-carrier communication method capable of improving reception quality, and a base station and a mobile station used therefor.
- a multicarrier communication method of the present invention is a multicarrier communication method for performing communication between a mobile station and a base station using a plurality of different carrier frequencies in the same area. Then, the mobile station detects a reception quality equivalent value of each of the plurality of carrier frequencies, and determines a carrier frequency to be used for communication based on the reception quality equivalent value.
- FIG. 1 is a diagram for explaining a case where W-CDMA is converted into four multicarriers at a carrier frequency of 2 GHz and a used bandwidth (BW) of 5 MHz.
- FIG. 2 This is a diagram for explaining the case where multi-carriers are used with a used bandwidth (BW) of 5 MHz and carrier frequencies of 2 GHz and 800 MHz.
- BW used bandwidth
- FIG. 3 is a diagram showing a cell configuration of one embodiment of the present invention.
- FIG. 4 is a block configuration diagram of a first embodiment of the present invention.
- FIG. 5 is an operation sequence according to the first embodiment of the present invention.
- FIG. 6 is a block configuration diagram of a second embodiment of the present invention.
- FIG. 7 is an operation sequence according to the second embodiment of the present invention.
- FIG. 8 is a block configuration diagram of a third embodiment of the present invention.
- FIG. 9 is an operation sequence according to the third embodiment of the present invention.
- FIG. 10 is a block configuration diagram of a fourth embodiment of the present invention.
- FIG. 11 is an operation sequence of the fourth embodiment of the present invention.
- FIG. 12 is a block configuration diagram of a fifth embodiment of the present invention.
- FIG. 13 is an operation sequence according to the fifth embodiment of the present invention.
- FIG. 14 is a block configuration diagram of a sixth embodiment of the present invention.
- FIG. 15 is an operation sequence according to the sixth embodiment of the present invention.
- the configuration is shown by taking multi-carrier as an example with two carriers of carrier frequencies 2GHz and 800MHz.
- the carrier frequency to be used if the radio propagation path characteristics are different, it is not necessary to use the above frequency.
- carrier frequency is 2GHz and 800MHz multicarrier
- the present invention focuses on the fact that the radio propagation path characteristics as described above are different.
- FIG. 3 shows a cell configuration according to an embodiment of the present invention.
- the cell 3 formed by the base station 1 having a carrier frequency of 800 MHz is indicated by a broken line
- the cell 4 formed by the base station 2 having a carrier frequency of 2 GHz is indicated by a solid line.
- the cell radius of MHz is large! / And the cell configuration is adopted.
- FIG. 4 is a block diagram of the first embodiment of the present invention
- FIG. 5 shows an operation sequence of the first embodiment of the present invention.
- the broadcast information transmitting unit 11 outputs broadcast information and common control information.
- the data transmission unit 12 outputs control data and user data.
- the frequency converter 13 converts the supplied broadcast information and common control information, or control data and user data transmission signals to a carrier frequency of 2 GHz.
- the frequency conversion unit 14 converts the broadcast information and common control information supplied or the transmission signal of control data and user data to a carrier frequency of 800 MHz.
- the mixing unit 15 mixes the transmission signals of the carrier frequencies 2 GHz and 800 MHz and transmits them from the antenna.
- the receiving unit 16 demodulates the signal received by the antenna and extracts the comparison result of the received electric field strength transmitted by the mobile station 20.
- the frequency controller 17 compares the extracted received field strength. Based on the result, the switch 18 is controlled, and the control data and user data from the data transmission unit 12 are supplied to one of the frequency conversion units 13 and 14.
- frequency converter 21 separates the signal received by the antenna into components of carrier frequencies 2 GHz and 800 MHz, and supplies the components of carrier frequency 2 GHz to received electric field strength converter 22, A component with a frequency of 800 MHz is supplied to the received electric field strength converter 23.
- the receiving electric field strength measuring units 22 and 23 measure the received electric field strength as the reception quality equivalent value at each carrier frequency.
- the comparison information generation unit 24 compares the received electric field strength and supplies the comparison result to the transmission unit 25, and controls the switch 26 based on the comparison result.
- the transmission unit 25 maps the comparison result of the received electric field strength to the physical channel corresponding to the broadcast information, and transmits it to the base station 10 from the antenna.
- the switch 26 supplies the receiver 27 with one of the components of the carrier frequency 2 GHz and 800 MHz output from the frequency converter 21.
- the receiver 27 demodulates the supplied signal.
- broadcast information and common control information from base station 10 are transmitted at both carrier frequencies 2 GHz and 800 MHz (step S 10).
- the frequency converter 21 separates the received signal into two carrier frequency components (step S 11).
- the receiving field strength measurement units 22 and 23 measure the received field strength at carrier frequencies of 2 GHz and 800 MHz (steps SI 2 and S13).
- the comparison information generation unit 24 compares the received electric field strength (step S14), and the transmission unit 25 maps the reception electric field strength comparison result to the physical channel corresponding to the broadcast information, and the carrier frequency is 2 GHz.
- the carrier frequency for transmitting the comparison result of the received electric field strength from the mobile station 10 may be 2 GHz, 800 MHz, or both frequencies.
- the reception unit 16 extracts the comparison result of the received electric field strength transmitted from the mobile station 20, and the use frequency control unit 17 uses the received electric field strength comparison result to broadcast.
- the frequency for transmitting data (control data and user data) other than information and common control information is determined (step S16).
- the determination method is realized by selecting a frequency having a high received electric field strength.
- the switch 26 is controlled based on the comparison result, and the reception quality is high.
- the carrier frequency of 2 GHz and 800 MHz is demodulated by the receiving unit 27 (steps S19, S20). ).
- the mobile station 20 can communicate at a frequency with a high received electric field strength, that is, a frequency with high received quality.
- a frequency with high received quality For example, in the cell configuration shown in FIG. 3, the mobile station at position # 1 is close to the base station 2 with a carrier frequency of 2 GHz far from the base station 1 with a carrier frequency of 800 MHz.
- the received electric field strength is higher than 800 MHz, and it is used for communication of control data and user data at a carrier frequency of 2 GHz.
- the mobile station at position # 2 is closer to base station 1 with a carrier frequency of 800MHz, and is far from base station 2 with a carrier frequency of 2GHz. Therefore, the received field strength at a carrier frequency of 800MHz increases, and the carrier frequency is 800MHz. Control data and user data are communicated.
- FIG. 6 is a block diagram of the second embodiment of the present invention
- FIG. 7 shows an operation sequence of the second embodiment of the present invention.
- FIG. 6 the same parts as those in FIG. 6, the same parts as those in FIG.
- broadcast information transmitting section 11 outputs broadcast information and common control information.
- the data transmission unit 12 outputs control data and user data.
- the frequency converter 13 converts the supplied broadcast information and common control information, or transmission signals of control data and user data, to a carrier frequency of 2 GHz.
- the frequency conversion unit 14 converts the broadcast information and common control information supplied or the transmission signal of control data and user data to a carrier frequency of 800 MHz.
- the mixing unit 15 mixes the transmission signals of the carrier frequencies 2 GHz and 800 MHz and transmits them from the antenna. To do.
- the receiving unit 16 demodulates the signal received by the antenna and extracts the position information transmitted by the mobile station 20.
- the use frequency control unit 29 controls the switch 18 based on the extracted location information and the cell configuration information possessed by the base station, and transmits the control data and user data from the data transmission unit 12 to the frequency conversion units 13 and 14. Supply to either one.
- the position information detection unit 31 detects current position information.
- GPS Global Positioning System
- the transmission unit 25 maps the location information to a physical channel corresponding to the broadcast information and transmits it to the base station 10.
- the frequency converter 21 separates the signal received by the antenna into components of the carrier frequencies 2 GHz and 800 MHz and supplies them to the use frequency controller 32.
- the use frequency control unit 32 receives the comparison result of the propagation loss with either the carrier frequency component of 2 GHz or the carrier frequency of 800 MHz, and controls the switch 26 based on the comparison result of the propagation loss.
- the switch 26 transmits control data and user data out of the carrier frequency components of 2 GHz and 800 MHz output from the frequency converter 21, and supplies the carrier frequency component to the receiver 27.
- the receiving unit 27 demodulates the supplied signal.
- broadcast information and common control information from base station 10 are transmitted at both carrier frequencies of 2 GHz and 800 MHz (step S30).
- the mobile station 20 receives broadcast information and common control information from the base station 10, and
- the position information detector 31 receives the GPS information (Step S32), and detects the current position information (Step S33).
- the detected position information is supplied to the transmission unit 25, and the transmission unit 25 maps the position information to a physical channel corresponding to the broadcast information and transmits it to the base station 10 (step S34).
- the carrier frequency for transmitting location information from the mobile station 10 may be 2 GHz, 800 MHz, or both frequencies.
- the position information transmitted from the mobile station 20 is extracted by the receiving unit 16 and supplied to the use frequency control unit 29.
- the frequency controller 29 uses the received location information of the mobile station 20 and the location information of the base station (cell configuration information) to calculate the propagation loss for both the carrier frequency 2 GHz and 800 MHz (steps S35 and S36) Broadcast information and common control information Determines the frequency for transmitting data other than information (control data and user data) (step S37).
- the determination method selects a frequency with a smaller propagation loss obtained from the equation (1) based on the position information of the mobile station 20 and the position information of the base station.
- the propagation loss used for selection instantaneous data, average value over a certain period, moving average value, etc. can be used.
- the propagation loss comparison result power is transmitted only from a carrier frequency with a high reception quality of 2 GHz or 800 MHz (steps S38, S39), and the control data and user data have a high reception quality!
- the carrier frequency is 2 GHz. Or it will be transmitted only from 800MHz (step S40, S41).
- the mobile station 20 controls the switch 26 (step S42), and either the carrier frequency 2GHz or 800MHz with high reception quality is received by the receiving unit 27. Demodulated (steps S43, S44).
- the mobile station at position # 1 is close to the base station 2 with a carrier frequency of 2GHz that is far from the base station 1 with a carrier frequency of 800MHz. It is used for communication of control data and user data at a carrier frequency of 2 GHz.
- the mobile station at position # 2 is closer to base station 1 with a carrier frequency of 800MHz, and is far from base station 2 with a carrier frequency of 2GHz. Therefore, the propagation loss at carrier frequency of 800MHz is reduced, and control is performed at a carrier frequency of 800MHz. Data and user data are communicated.
- frequency selection is performed using position information. For this reason, it is possible to select a frequency having a high average received field strength compared to the first embodiment in which frequency selection is performed using the received field strength as an index. On the other hand, in the first embodiment, it is possible to select a frequency with higher communication quality in a place where radio waves such as a building are difficult to reach.
- FIG. 8 is a block diagram of the third embodiment of the present invention, and FIG. 9 shows an operation sequence of the third embodiment of the present invention.
- FIG. 8 the same parts as those in FIG. 8.
- broadcast information transmitting section 11 outputs broadcast information and common control information.
- the data transmission unit 12 outputs control data and user data.
- the frequency converter 13 converts the supplied broadcast information and common control information, or transmission signals of control data and user data, to a carrier frequency of 2 GHz.
- the frequency conversion unit 14 converts the broadcast information and common control information supplied or the transmission signal of control data and user data to a carrier frequency of 800 MHz.
- the mixing unit 15 mixes the transmission signals of the carrier frequencies 2 GHz and 800 MHz and transmits them from the antenna.
- the receiving unit 16 demodulates the signal received by the antenna and extracts the position information and the moving speed transmitted by the mobile station 20.
- the use frequency control unit 33 controls the switch 18 based on the extracted location information, the cell configuration information possessed by the base station, and the moving speed, and the control data and user data from the data transmission unit 12 are converted to the frequency conversion unit. Supply to either 13 or 14!
- the position information detection unit 31 uses the GPS 30 to detect the current position information of the mobile station 20.
- the moving speed detector 34 uses the GPS 30 to detect the moving speed of the mobile station 20.
- the detected position information and moving speed are supplied to the transmission unit 25, and the transmission unit 25 maps the position information to a physical channel corresponding to the broadcast information and transmits it to the base station 10.
- the frequency converter 21 separates the signal received by the antenna into components of the carrier frequencies 2 GHz and 800 MHz and supplies them to the use frequency controller 32.
- the use frequency control unit 32 receives the comparison result of the propagation loss with either the carrier frequency component of 2 GHz or the carrier frequency of 800 MHz, and controls the switch 26 based on the comparison result of the propagation loss.
- the switch 26 transmits control data and user data out of the carrier frequency components of 2 GHz and 800 MHz output from the frequency converter 21, and supplies the carrier frequency component to the receiver 27.
- the receiving unit 27 demodulates the supplied signal.
- the broadcast information and common control information from base station 10 are carrier frequency 2 It is transmitted at both GHz and 800MHz (step S50).
- the mobile station 20 receives the broadcast information and the common control information from the base station 10, and
- Step S51 the position information detector 31 receives GPS information (Step S52), and detects the current position information (Step S53). Also, the moving speed is detected (step S54). The detected position information and moving speed are supplied to the transmitting section 25, and the transmitting section 25 maps the position information and moving speed to the physical channel corresponding to the broadcast information and transmits it to the base station 10 (step S55).
- the carrier frequency for transmitting location information from the mobile station 10 may be 2 GHz, 800 MHz, or both frequencies.
- the position information and the moving speed transmitted from the mobile station 20 are extracted by the receiving unit 16 and supplied to the use frequency control unit 29.
- the frequency controller 29 uses the received location information of the mobile station 20 and the location information of the base station (cell configuration information) to calculate the propagation loss at both the carrier frequency of 2 GHz and 800 MHz (steps S56 and S57). Also, calculate the maximum Doppler frequency for both the carrier frequency of 2 GHz and 800 MHz (steps S58 and S59) 0
- step S 60 and S 61 the propagation loss and the maximum Doppler frequency power for each of the carrier frequencies 2 GHz and 800 MHz are estimated (steps S 60 and S 61), and the data other than the broadcast information and the common control information are estimated (steps S 60 and S 61).
- the frequency for transmitting control data and user data is determined (step S62).
- the determination method is to determine the propagation loss from equation (1) based on the position information of mobile station 20, the position information of the base station, and the moving speed, to determine the force Doppler frequency from equation (2), Loss and base station power
- the received field strength of the mobile station is estimated from the transmitted power of each carrier frequency, and the received quality is estimated from the received field strength and the maximum Doppler frequency of each carrier. As a result, the frequency with the higher reception quality is selected.
- instantaneous data an average value for a certain period, a moving average value, or the like can be used.
- the reception quality comparison result is transmitted only from a carrier frequency of 2 GHz or 8 OO MHz with high reception quality (steps S63, S64), and the control data and user data are of high reception quality !, carrier frequency of 2 GHz or 800 MHz. Will be sent only from (Steps S40 and S41).
- switch 26 is controlled based on the received reception quality comparison result (step S 67), and one of carrier frequencies 2 GHz and 800 MHz with high reception quality is demodulated by reception unit 27. (Steps S68, S69).
- frequency selection is performed using the moving speed in addition to the position information.
- FIG. 10 is a block diagram of the fourth embodiment of the present invention, and FIG. 11 shows an operation sequence of the fourth embodiment of the present invention.
- broadcast information transmitting section 11 outputs broadcast information and common control information.
- the data transmission unit 36 outputs control data and user data.
- the frequency conversion unit 13 converts the broadcast information and common control information, control data, and user data transmission signals supplied to a carrier frequency of 2 GHz.
- the frequency conversion unit 14 converts the broadcast information and common control information supplied, and transmission signals of control data and user data to a carrier frequency of 800 MHz.
- the mixing unit 15 mixes the transmission signals with the carrier frequencies of 2 GHz and 800 MHz and transmits them from the antenna.
- the receiver 16 demodulates the signal received by the antenna and extracts the ratio of the received electric field strength transmitted by the mobile station 20.
- the use frequency control unit 37 determines a distribution ratio based on the extracted ratio of received electric field strength, and the data transmission unit 36 distributes control data and user data to the frequency conversion units 13 and 14 according to the distribution ratio.
- frequency converter 21 separates the signal received by the antenna into components of carrier frequencies 2 GHz and 800 MHz, and supplies the components of carrier frequency 2 GHz to received electric field strength converter 22, A component with a frequency of 800 MHz is supplied to the received electric field strength converter 23.
- the receiving electric field strength measuring units 22 and 23 measure the received electric field strength at each carrier frequency.
- the ratio information generator 38 generates the ratio of the received electric field strength between the carrier frequency of 2 GHz and 800 MHz. Then, the data is supplied to the transmitter 25, and the receiver 39 is controlled based on the distribution ratio received from the base station 10.
- the transmission unit 25 maps the ratio of the received electric field strength to the physical channel corresponding to the broadcast information, and transmits it to the base station 10 from the antenna.
- the receiver 39 demodulates each of the carrier frequency components of 2 GHz and 800 MHz output from the frequency converter 21 and synthesizes them according to the distribution ratio.
- broadcast information and common control information from base station 10 are transmitted at both carrier frequencies of 2 GHz and 800 MHz (step S70).
- frequency conversion unit 21 separates the received signal into two carrier frequency components (step S71).
- the receiving electric field strength measuring units 22 and 23 measure the received electric field strength at carrier frequencies of 2 GHz and 800 MHz (steps S72 and S73).
- the ratio information generation unit 38 calculates the ratio of the received electric field strength (step S74), and the transmission unit 25 maps the received electric field strength ratio to the physical channel corresponding to the broadcast information, so that the carrier frequency is 2 GHz. Transmit to the base station 10 (step S75).
- the carrier frequency for transmitting the ratio of the received electric field strength from the mobile station 10 may be 2 GHz, 800 MHz, or both frequencies.
- the receiving unit 16 extracts the ratio of the received electric field strength transmitted from the mobile station 20, and the use frequency control unit 37 uses the received electric field strength ratio to report the broadcast information and In addition, the distribution ratio of the data amount at each carrier frequency for transmitting data other than the common control information (control data and user data) is determined (step S76), and this distribution ratio is transmitted to the mobile station 20 (step S77). .
- the determination method is such that a large amount of data is transmitted to a frequency where the received electric field strength is large and a small amount of data is transmitted to a frequency where the received electric field strength is low. .
- the data distribution ratio for example, an error in encoding data so that the reception quality such as BERR (Bit Error Rate) estimated from the ratio of the received electric field strength is the same.
- BERR Bit Error Rate
- the BER decreases as the coding rate decreases.
- the control data and user data are transmitted with a carrier frequency of 2 GHz and 800 MHz (steps S78, S79).
- the mobile station 20 receives the distribution ratio from the base station 10 (step S80), and the receiving unit 39 demodulates each of the carrier frequency components of 2 GHz and 800 MHz (steps S81 and S82) and combines them according to the distribution ratio. To do.
- the control data and the user data can be communicated in an environment having the same reception quality, although the information amount (data amount) is different.
- the amount of data transmitted at each carrier frequency is controlled using the ratio of the received electric field strength. Therefore, compared to the first embodiment in which frequency selection is performed using the received electric field strength as an index, more data can be transmitted because two frequencies are used. Furthermore, by using two frequencies, the received electric field strength is significantly reduced at one frequency, and even if communication is impossible, communication at the other frequency may be possible, so communication may be interrupted. Can be reduced.
- FIG. 12 is a block diagram of the fifth embodiment of the present invention, and FIG. 13 shows an operation sequence of the fifth embodiment of the present invention.
- FIG. 12 the same parts as those in FIGS. 6 and 10 are denoted by the same reference numerals.
- broadcast information transmitting section 11 outputs broadcast information and common control information.
- the data transmission unit 36 outputs control data and user data.
- the frequency converter 13 converts the supplied broadcast information and common control information, and transmission signals of control data and user data to a carrier frequency of 2 GHz.
- the frequency conversion unit 14 converts the broadcast information and common control information supplied, and transmission signals of control data and user data to a carrier frequency of 800 MHz.
- the mixing unit 15 mixes the transmission signals with the carrier frequencies of 2 GHz and 800 MHz and transmits them from the antenna.
- the receiving unit 16 demodulates the signal received by the antenna and extracts the position information transmitted by the mobile station 20.
- the use frequency control unit 40 determines the distribution ratio based on the extracted location information and the cell configuration information possessed by the base station, and the data transmission unit 36 determines the frequency of control data and user data according to this distribution ratio.
- the location information detection unit 31 uses the GPS 30 to detect the location information of the mobile station 20. Detection is performed. The detected position information is supplied to the transmission unit 25, and the transmission unit 25 maps the position information to a physical channel corresponding to the broadcast information and transmits it to the base station 10.
- the frequency converter 21 separates the signal received by the antenna into components of carrier frequencies 2 GHz and 800 MHz, and supplies it to the used frequency controller 41.
- the use frequency control unit 41 receives the distribution ratio of the carrier frequency 2 GHz and the carrier frequency 800 MHz from the base station 10 and controls the reception unit 39 based on this distribution ratio.
- the receiver 39 demodulates each of the carrier frequency components of 2 GHz and 800 MHz output from the frequency converter 21 and synthesizes them according to the distribution ratio.
- broadcast information and common control information from base station 10 are transmitted at both carrier frequencies of 2 GHz and 800 MHz (step S90).
- Mobile station 20 receives broadcast information and common control information from base station 10, and
- Step S91 the GPS information is received by the position information detector 31 (Step S92), and the current position information is detected (Step S93).
- the detected position information is supplied to the transmission unit 25, and the transmission unit 25 maps the position information to a physical channel corresponding to the broadcast information and transmits it to the base station 10 (step S94).
- the carrier frequency for transmitting location information from the mobile station 10 may be 2 GHz, 800 MHz, or both frequencies.
- the position information transmitted from the mobile station 20 is extracted by the receiving unit 16 and supplied to the use frequency control unit 29.
- the frequency controller 29 uses the received location information of the mobile station 20 and the location information of the base station (cell configuration information) to calculate the propagation loss at both carrier frequencies 2 GHz and 800 MHz (steps S95 and S96).
- the ratio of propagation loss is obtained (step S97), and the distribution ratio of the data amount at each carrier frequency for transmitting data (control data and user data) other than broadcast information and common control information is determined (step S98). This distribution ratio is transmitted to the mobile station 20 (step S99).
- the determination method is based on the ratio of the propagation loss obtained from the equation (1) based on the position information of the mobile station 20 and the position information of the base station.
- the distribution ratio is determined so that a large amount of data is lost and a small amount of data is transmitted at a low frequency.
- the received electric field strength in the mobile station is estimated from the propagation loss and the transmission power of each carrier frequency transmitted from the base station, and the received power
- the field strength can be determined by variably controlling the code rate of the error correction code when the data is coded so that the estimated reception quality such as BER is the same.
- the propagation loss used for selection instantaneous data, average value over a certain period, moving average value, etc. can be used.
- control data and user data are transmitted with a carrier frequency of 2 GHz and 800 MHz (steps S 100 and S 101).
- the mobile station 20 receives the distribution ratio from the base station 10 (step S102), and the receiving unit 39 demodulates each of the carrier frequency components of 2 GHz and 800 MHz (steps S 103 and S104), according to the above distribution ratio. Synthesize.
- the control data and the user data can be communicated in an environment having the same reception quality although the information amount (data amount) is different.
- the amount of data transmitted at each carrier frequency is controlled using propagation loss. Therefore, more data can be transmitted because two frequencies are used in the second embodiment in which frequency selection is performed using propagation loss as an index.
- propagation loss increases significantly at one frequency, and even if communication is impossible, communication may be interrupted because there is a possibility that communication can be performed at the other frequency. Possibility can be reduced
- FIG. 14 is a block diagram of the sixth embodiment of the present invention, and FIG. 15 shows an operation sequence of the sixth embodiment of the present invention.
- FIG. 14 the same parts as those in FIGS. 8 and 10 are denoted by the same reference numerals.
- broadcast information transmitting section 11 outputs broadcast information and common control information.
- the data transmission unit 36 outputs control data and user data.
- the frequency converter 13 converts the supplied broadcast information and common control information, and transmission signals of control data and user data to a carrier frequency of 2 GHz.
- the frequency conversion unit 14 converts the broadcast information and common control information supplied, and transmission signals of control data and user data to a carrier frequency of 800 MHz.
- the mixing unit 15 mixes the transmission signals with the carrier frequencies of 2 GHz and 800 MHz and transmits them from the antenna.
- the receiving unit 16 demodulates the signal received by the antenna and transmits the position information and the information transmitted by the mobile station 20. And moving speed are extracted.
- the use frequency control unit 43 determines a distribution ratio based on the extracted position information, the cell configuration information held by the base station, and the moving speed, and the data transmission unit 36 transmits control data and user data according to the distribution ratio. Distribute to frequency converters 13 and 14.
- the location information detection unit 31 uses the GPS 30 to detect the current location information of the mobile station 20.
- the moving speed detector 34 uses the GPS 30 to detect the moving speed of the mobile station 20.
- the detected position information and moving speed are supplied to the transmission unit 25, and the transmission unit 25 maps the position information to a physical channel corresponding to the broadcast information and transmits it to the base station 10.
- the frequency converter 21 separates the signal received by the antenna into components of carrier frequencies 2 GHz and 800 MHz and supplies them to the used frequency controller 44.
- the used frequency control unit 44 receives the distribution ratio of the carrier frequency 2 GHz and the carrier frequency 800 MHz from the base station 10 and controls the reception unit 39 based on this distribution ratio.
- the receiver 39 demodulates each of the carrier frequency components of 2 GHz and 800 MHz output from the frequency converter 21 and synthesizes them according to the distribution ratio.
- broadcast information and common control information from base station 10 are transmitted at both carrier frequencies of 2 GHz and 800 MHz (step S 110).
- the mobile station 20 receives the broadcast information and the common control information from the base station 10, and
- the position information detector 31 receives GPS information (Step S112), and detects the current position information (Step S113). Further, the moving speed is detected (step S114). The detected position information and moving speed are supplied to the transmitting section 25, and the transmitting section 25 maps the position information and moving speed to the physical channel corresponding to the broadcast information and transmits it to the base station 10 (step S115).
- the carrier frequency for transmitting location information from the mobile station 10 may be 2 GHz, 800 MHz, or both frequencies.
- the position information and the moving speed transmitted from the mobile station 20 are extracted by the receiving unit 16 and supplied to the use frequency control unit 43.
- the frequency controller 43 uses the received location information of the mobile station 20 and the location information of the base station (cell configuration information) to calculate the propagation loss at both the carrier frequency of 2 GHz and 800 MHz (steps SI 16, S117). . Also, The maximum Doppler frequency is calculated for both the carrier frequency of 2 GHz and 800 MHz (steps S118 and S119).
- the propagation loss and the maximum Doppler frequency power for each of the carrier frequencies 2 GHz and 800 MHz are also estimated for the BER and the like for each of the carrier frequencies 2 GHz and 800 MHz (Steps S120 and S121), and the ratio of the reception quality is obtained (Step S120).
- the distribution ratio of the data amount at each carrier frequency for transmitting data (control data and user data) other than the broadcast information and the common control information is determined (step S123), and this distribution ratio is transmitted to the mobile station 20. Transmit (step S124).
- the determination method is to determine the propagation loss from Equation (1), to obtain the equation (2) force maximum Doppler frequency, Loss and base station power Estimate the received field strength of the mobile station from the transmitted power of each carrier frequency, and estimate the reception quality (BER) from this received field strength and the maximum Doppler frequency of each carrier, Obtain the ratio of reception quality.
- the distribution ratio is determined so that a larger amount of data is transmitted to the higher reception quality frequency and a smaller amount of data is transmitted to the lower reception quality frequency.
- control data and user data are also transmitted with a carrier frequency of 2 GHz and 800 MHz (steps SI 25 and SI 26).
- the mobile station 20 receives the distribution ratio from the base station 10 (step S127), and the receiving unit 39 demodulates each of the carrier frequency components of 2 GHz and 800 MHz (steps S 128 and S129), according to the above distribution ratio. Synthesize.
- control data and user data can be communicated in an environment with the same reception quality, although the information amount (data amount) is different.
- the amount of data transmitted at each carrier frequency is controlled using the estimated reception quality. Therefore, compared to the third embodiment in which frequency selection is performed using the estimated reception quality as an index, more data can be transmitted because two frequencies are used. In addition, use two frequencies As a result, even if reception quality deteriorates significantly at one frequency and communication is impossible, communication at the other frequency may be possible, so that the possibility of interruption of communication can be reduced.
- the reception electric field strength measurement units 22 and 23 correspond to the reception quality equivalent value detection means described in the claims
- the transmission unit 25 corresponds to the notification means
- the position information detection unit 31 corresponds to the position information detection means.
- the speed detector 34 corresponds to the moving speed detector
- the used frequency controllers 17, 29, 33 correspond to the carrier frequency determiner
- the used frequency controllers 37, 40, 43 correspond to the distribution ratio determiner. .
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP05719807.9A EP1855401A4 (en) | 2005-03-02 | 2005-03-02 | MULTI-CARRIER COMMUNICATION PROCESS AND BASE STATION AND MOBILE STATION USED FOR THIS |
JP2007505775A JPWO2006092856A1 (ja) | 2005-03-02 | 2005-03-02 | マルチキャリア通信方法及びそれに使用される基地局及び移動局 |
PCT/JP2005/003492 WO2006092856A1 (ja) | 2005-03-02 | 2005-03-02 | マルチキャリア通信方法及びそれに使用される基地局及び移動局 |
US11/896,397 US20070297385A1 (en) | 2005-03-02 | 2007-08-31 | Multi-carrier communication method, and base station and mobile station used therefor |
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PCT/JP2005/003492 WO2006092856A1 (ja) | 2005-03-02 | 2005-03-02 | マルチキャリア通信方法及びそれに使用される基地局及び移動局 |
Related Child Applications (1)
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US11/896,397 Continuation US20070297385A1 (en) | 2005-03-02 | 2007-08-31 | Multi-carrier communication method, and base station and mobile station used therefor |
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WO2006092856A1 true WO2006092856A1 (ja) | 2006-09-08 |
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US (1) | US20070297385A1 (ja) |
EP (1) | EP1855401A4 (ja) |
JP (1) | JPWO2006092856A1 (ja) |
WO (1) | WO2006092856A1 (ja) |
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JP2018191330A (ja) * | 2013-09-27 | 2018-11-29 | サン パテント トラスト | デュアルコネクティビティにおける電力制御および電力ヘッドルーム報告 |
JP2017085525A (ja) * | 2015-10-30 | 2017-05-18 | Kddi株式会社 | 基地局装置、通信方法およびプログラム |
Also Published As
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EP1855401A1 (en) | 2007-11-14 |
EP1855401A4 (en) | 2014-02-19 |
JPWO2006092856A1 (ja) | 2008-08-07 |
US20070297385A1 (en) | 2007-12-27 |
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