WO2009107676A1 - 移動局装置および送信電力制御方法 - Google Patents
移動局装置および送信電力制御方法 Download PDFInfo
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- WO2009107676A1 WO2009107676A1 PCT/JP2009/053445 JP2009053445W WO2009107676A1 WO 2009107676 A1 WO2009107676 A1 WO 2009107676A1 JP 2009053445 W JP2009053445 W JP 2009053445W WO 2009107676 A1 WO2009107676 A1 WO 2009107676A1
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- base station
- connection request
- mobile station
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- transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
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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
- H04L5/0078—Timing of allocation
- H04L5/0082—Timing of allocation at predetermined intervals
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
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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
- H04L5/0001—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
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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
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/48—TPC being performed in particular situations during retransmission after error or non-acknowledgment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Definitions
- the present invention relates to a mobile station apparatus and a transmission power control method, and more particularly, to a multicarrier communication system using a plurality of subcarriers.
- the transmission output of a base station is higher than that of a mobile station, and the antenna height of the base station is often higher than that of a mobile station. Therefore, the reach of radio signals transmitted from the mobile station to the base station (hereinafter referred to as “uplink budget”) is the reach of radio signals transmitted from the base station to the mobile station (hereinafter referred to as “downlink budget”). )
- uplink budget the reach of radio signals transmitted from the mobile station to the base station
- downlink budget the reach of radio signals transmitted from the base station to the mobile station
- Patent Document 1 discloses a base station apparatus that prevents a decrease in frequency utilization efficiency and an increase in power consumption by allocating fewer subcarriers than a traffic channel to a control channel.
- Japanese Patent No. 3485860 discloses a base station apparatus that prevents a decrease in frequency utilization efficiency and an increase in power consumption by allocating fewer subcarriers than a traffic channel to a control channel.
- the conventional mobile communication system has a problem that the communication area of the base station is reduced when the uplink budget is smaller than the downlink budget.
- the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a mobile station apparatus and a transmission power control method capable of expanding a communication area of a base station apparatus.
- a mobile station apparatus is a mobile station apparatus that transmits a radio signal to a base station apparatus using a plurality of subcarriers, and the mobile station apparatus requests connection to the base station apparatus.
- a connection request transmitting means for transmitting a signal, and a connection response for detecting whether or not a connection response signal is received from the base station apparatus within a predetermined time after the connection request transmitting means transmits the connection request signal.
- the connection response signal is not received within the predetermined period of time with the detection means, the number of subcarriers used for radio signal transmission to the base station apparatus is reduced, and the power corresponding to the reduced amount is reduced per subcarrier.
- transmission control means for causing the connection request transmission means to retransmit the connection request signal.
- the mobile station apparatus when the connection response signal from the base station apparatus is not received within a predetermined time after transmitting the connection request signal (when the uplink budget is smaller than the downlink budget), the mobile station apparatus The number of subcarriers used for signal transmission to the station apparatus is decreased, the transmission power per subcarrier is increased by the power corresponding to the decrease, and the connection request signal is retransmitted. For this reason, it is possible to extend the reach of the radio signal transmitted from the mobile station device to the base station device without increasing the power consumption of the mobile station device. That is, the uplink budget is improved and the communication area of the base station device can be expanded.
- the transmission power per subcarrier is obtained by dividing a predetermined transmission power upper limit value by the number of subcarriers. According to this aspect, transmission power per subcarrier can be maximized within a range that does not exceed the transmission power upper limit value.
- the transmission control means further includes means for counting the number of retransmissions of the connection request signal, and when the number of retransmissions of the connection request signal reaches a predetermined number, the connection request transmission Limiting retransmission of the connection request signal by the means. According to this aspect, the number of retransmissions of the connection request signal can be suppressed to an appropriate number.
- the mobile station apparatus transmits a radio signal to the base station apparatus by an orthogonal frequency division multiplexing method.
- the mobile communication system that employs the orthogonal frequency division multiplexing method it is possible to expand the communication area of the base station apparatus.
- the transmission power control method is a transmission power control method in a mobile station apparatus that transmits a radio signal to a base station apparatus using a plurality of subcarriers, and a connection request to the base station apparatus Transmitting a signal; detecting whether a connection response signal from the base station apparatus is received within a predetermined time after transmitting the connection request signal; and connecting the connection response within the predetermined time.
- a connection response signal from the base station apparatus is received within a predetermined time after transmitting the connection request signal
- the connection request Retransmitting the signal.
- FIG. 1 is an overall configuration diagram of a mobile communication system according to an embodiment of the present invention. It is a sequence diagram which shows the link channel establishment process (at the time of an incoming call) which concerns on embodiment of this invention. It is a functional block diagram of the mobile station which concerns on embodiment of this invention. It is a functional block diagram of the base station which concerns on embodiment of this invention. It is a figure which shows the transmission power per subcarrier number and subcarrier before a change. It is a figure which shows the number of subcarriers and the transmission power per subcarrier after a change. It is a figure which shows the pass bandwidth of the FIR filter before a change. It is a figure which shows the pass bandwidth of the FIR filter after a change.
- FIG. 1 is an overall configuration diagram of a mobile communication system 10 according to an embodiment of the present invention.
- the mobile communication system 10 includes a base station 12 and a plurality of mobile stations 14 (only three are shown here).
- the base station 12 moves in a plurality of ways by TDMA / TDD (Time Division Multiple Access / Time Division Duplex: Time Division Multiple Access / Time Division Bidirectional Communication) and OFDMA (Orthogonal Frequency Division Multiple Access). Multiplex communication with the station 14 is performed.
- TDMA / TDD Time Division Multiple Access / Time Division Duplex: Time Division Multiple Access / Time Division Bidirectional Communication
- OFDMA Orthogonal Frequency Division Multiple Access
- the mobile station 14 is, for example, a portable mobile phone, a portable information terminal, or a communication card.
- a transmission power upper limit value is defined for the mobile station 14, and even when the uplink budget is insufficient, the transmission power cannot be increased beyond this upper limit value.
- the mobile communication system 10 includes a common channel (CCH) commonly used between the base station 12 and the plurality of mobile stations 14 as a radio channel for the base station 12 and the mobile station 14 to perform radio communication. And an individual channel (Individual Channel: ICH) used between the base station 12 and each mobile station 14 is defined.
- CCH Common Channel
- ICH Intelligent Channel
- Each of these radio channels is composed of one or a plurality of subchannels composed of a plurality of subcarriers orthogonal to each other (see FIG. 9).
- an upper limit is defined for the number of subcarriers constituting one radio channel.
- the two or more subchannels may be adjacent to each other or separated from each other.
- a plurality of subcarriers constituting one subchannel may be adjacent to each other or separated from each other.
- CCH and ICH a plurality of function channels that are properly used in each phase of communication are defined.
- a paging channel Paging Channel: PCH
- a timing correction channel Timing Correct Channel: TCCH
- a signaling control channel Signaling Control Channel: SCCH
- the ICH defines an individual control channel (Individual Control Channel: ICCH), a communication channel (Traffic Channel: TCH), and the like.
- FIG. 2 is a sequence diagram showing a link channel establishment process at the time of an incoming call in the mobile communication system 10.
- the base station 12 transmits a call signal for notifying the incoming call simultaneously to the mobile station 14 located in the communication area by PCH (S100).
- the mobile station 14 that has received the paging signal addressed to itself transmits a connection request signal for requesting establishment of a link channel to the base station 12 using the TCCH (S102).
- the connection request signal transmitted in S102 does not reach the base station 12.
- the mobile station 14 reduces the number of subcarriers, increases the transmission power per subcarrier (S104), and retransmits the connection request signal (S106). Thereby, the connection request signal transmitted from the mobile station 14 can easily reach the base station 12.
- the base station 12 When the connection request signal retransmitted in S106 reaches the base station 12, the base station 12 detects the number of subcarriers of the TCCH used for transmission of the connection request signal, and receives it according to the detected number of subcarriers. The bandwidth is changed (S108). Here, since the reception bandwidth of base station 12 in S106 is wider than the number of detected TCCH subcarriers, base station 12 reduces the reception bandwidth applied to subsequent reception. Thereafter, the base station 12 determines an ICH to be assigned to the mobile station 14 and transmits a connection response signal including the determined ICH to the mobile station 14 via the SCCH (S110). When the mobile station 14 receives the connection response signal from the base station 12, the link channel establishment between the base station 12 and the mobile station 14 is completed.
- the mobile station 14 transmits an allocation confirmation signal for confirming the allocation of the ICH to the base station 12 using the ICH (ICCH) (S112), so that the ICH is transmitted between the mobile station 14 and the base station 12.
- Wireless communication using is started (S114).
- the transmission conditions (the number of subcarriers and the transmission power per subcarrier) related to the connection request signal of S106 that has reached the base station 12 are also applied to the wireless transmission after S112 by the mobile station 14. Uplink budget is improved. Further, since the reception bandwidth of the base station 12 reduced in S108 is maintained thereafter, the signal reception quality at the base station 12 is improved. In this way, the mobile communication system 10 realizes expansion of the communication area of the base station 12.
- FIG. 3 is a functional block diagram of the mobile station 14.
- the mobile station 14 includes an antenna 20, a transmission / reception unit 22, an OFDM signal processing unit 24 (OFDM demodulation unit 26, subcarrier control unit 28, OFDM modulation unit 30), and a control unit 32 (connection request transmission).
- Unit 34 connection response detection unit 36, retransmission control unit 38, transmission channel control unit 40, transmission power control unit 42).
- the antenna 20 receives a radio signal and outputs the received radio signal to the transmission / reception unit 22.
- a radio signal supplied from the transmission / reception unit 22 is radiated to the base station 12. Reception and transmission of radio signals are switched in a time-sharing manner based on instructions from the transmission / reception unit 22.
- the transmission / reception unit 22 includes a low noise amplifier, a power amplifier, a local oscillator, a mixer, and a filter.
- a radio signal input from the antenna 20 is amplified by a low noise amplifier, further down-converted to an intermediate frequency signal, and then output to the OFDM signal processing unit 24.
- the intermediate frequency signal input from the OFDM signal processing unit 24 is up-converted into a radio signal, amplified to a transmission output level by a power amplifier, and then supplied to the antenna 20.
- the transmission power of each subcarrier included in the radio signal is amplified so as to be the transmission power per subcarrier notified from the transmission power control unit 42 described later.
- the OFDM signal processing unit 24 functionally includes an OFDM demodulation unit 26, a subcarrier control unit 28, and an OFDM modulation unit 30.
- the OFDM demodulator 26 includes an A / D converter, an FFT (Fast Fourier Transform) unit, and a symbol demapper.
- the intermediate frequency signal input from the transmission / reception unit 22 to the OFDM demodulation unit 26 is converted into a digital signal by the A / D converter, and converted into each subcarrier component of the complex symbol sequence by Fourier transform executed by the FFT unit.
- Each subcarrier component of the complex symbol sequence is converted into a symbol sequence by parallel-serial conversion, decoded into a data bit sequence (received data) according to the symbol modulation method by the symbol demapper, and then output to the control unit 32. .
- the subcarrier control unit 28 controls the OFDM modulation unit 30 so that the number of subcarriers used for radio signal transmission becomes the number of subcarriers notified from the transmission channel control unit 40 described later.
- the OFDM modulation unit 30 includes a D / A converter, an IFFT (Inverse Fourier Transform) unit, and a symbol mapper.
- a data bit sequence (transmission data) input from the control unit 32 to the OFDM modulation unit 30 is converted into a complex symbol sequence by a symbol mapper and then divided into subcarrier components by serial-parallel conversion.
- This series-parallel conversion process is controlled by the subcarrier control unit 28 so that the number of subcarrier components of the complex symbol sequence is the same as the number of subcarriers notified from the transmission channel control unit 40.
- Each subcarrier component of the complex symbol sequence obtained in this way is converted into a sample value of an OFDM symbol by inverse Fourier transform executed in the IFFT unit.
- the sample value of the OFDM symbol is converted into an analog signal by a D / A converter, and then output to the transmission / reception unit 22 as a baseband OFDM signal (modulated signal).
- This baseband OFDM signal is composed of the same number of subcarriers as the number of subcarriers notified from the transmission channel control unit 40.
- the subcarrier control unit 28, the FFT unit, the IFFT unit, the symbol mapper, and the symbol demapper are configured by, for example, a DSP (Digital Signal Processor).
- DSP Digital Signal Processor
- the control unit 32 includes, for example, a CPU and a memory, and has a function of controlling each unit of the mobile station 14 when the CPU executes a program stored in the memory.
- the control unit 32 functionally includes a connection request transmission unit 34, a connection response detection unit 36, a retransmission control unit 38, a transmission channel control unit 40, and a transmission power control unit 42.
- connection request transmission unit 34 transmits a connection request signal to the base station 12 when the mobile station 14 starts wireless communication with the base station 12 (the data bit string corresponding to the connection request signal is transmitted to the OFDM modulation unit 30). Output). Further, the connection request transmission unit 34 retransmits the connection request signal in accordance with an instruction from a retransmission control unit 38 to be described later.
- the connection response detection unit 36 determines whether or not the connection response signal from the base station 12 is received within a predetermined time after the connection request transmission unit 34 transmits the connection request signal (the data bit string corresponding to the connection response signal is Whether the signal is input from the OFDM demodulator 26 to the controller 32). For example, the connection response detection unit 36 starts counting the timer at the timing when the connection request signal is transmitted, and determines whether or not the connection response signal is received before the count value of the timer reaches a predetermined value. Also good.
- the retransmission control unit 38 instructs the transmission channel control unit 40 to reduce the number of subcarriers used for transmitting the radio signal to the base station 12 when the connection response signal is not received within a predetermined time after the connection request signal is transmitted.
- the transmission power control unit 42 is instructed to increase the transmission power per subcarrier by the power corresponding to the decrease in the number of subcarriers.
- the retransmission control unit 38 instructs the connection request transmission unit 34 to retransmit the connection request signal. Note that the retransmission control unit 38 may count the number of times the connection request transmission unit 34 retransmits the connection request signal, and may limit the retransmission of the connection request signal when the number of retransmissions reaches a predetermined number.
- the transmission channel control unit 40 controls subchannels (transmission channels) such as TCCH and ICCH used for transmission of radio signals to the base station 12.
- subchannels transmission channels
- TCCH and ICCH used for transmission of radio signals to the base station 12.
- the number of subcarriers constituting the transmission channel is determined in the link channel establishment phase.
- the transmission channel control unit 40 sets the number of TCCH subcarriers used for transmission of the connection request signal to an initial number determined by the mobile communication system 10 (see FIG. 5A). If link channel establishment is completed without retransmitting the connection request signal, an initial number of subcarriers is used for subsequent radio signal transmission (transmission by ICCH, TCH, etc.).
- the transmission channel control unit 40 sets a number that is one or more less than the initial number as the new number of subcarriers of the TCCH according to an instruction from the retransmission control unit 38, This is notified to the subcarrier control unit 28 and the transmission power control unit 42 (see FIG. 5B).
- the transmission channel control unit 40 sets the number of new subcarriers of the TCCH by 1 or more less than the number of subcarriers used for the previous connection request signal transmission. It is a number.
- the transmission channel control unit 40 gradually decreases the number of TCCH subcarriers from the initial number according to the number of times of connection request signal transmission until the connection response signal from the base station 12 is received.
- the same number of subcarriers as the number of subcarriers at that time are used for subsequent transmission of radio signals.
- the transmission power control unit 42 controls transmission power when transmitting a radio signal to the base station 12. Particularly, when the number of TCCH subcarriers decreases in the link channel establishment phase, the transmission power control unit 42 determines a new transmission power so that the transmission power per subcarrier increases by the power corresponding to the subcarrier decrease ( 5B), the determined transmission power per subcarrier is notified to the transmission / reception unit 22.
- the transmission power control unit 42 may use a value obtained by dividing the transmission power upper limit value of the mobile station 14 by the number of subcarriers notified from the transmission channel control unit 40 as the new transmission power per subcarrier. . By so doing, it is possible to maximize the transmission power per subcarrier within a range that does not exceed the transmission power upper limit.
- the mobile station 14 when the connection response signal from the base station 12 is not received within a predetermined time after transmitting the connection request signal, the mobile station 14 reduces the number of subcarriers constituting the transmission channel and copes with the decrease.
- the transmission power per subcarrier is increased by the power to be transmitted, and the connection request signal is retransmitted. For this reason, the reach of the radio signal transmitted from the mobile station 14 to the base station 12 can be extended without increasing the power consumption of the mobile station 14.
- FIG. 4 is a functional block diagram of the base station 12.
- the base station 12 includes an antenna 50, a transmission / reception unit 52, an OFDM signal processing unit 54 (FIR (Finite Impulse Response) filter 56, an OFDM demodulation unit 58, a subcarrier number detection unit 60, and an FIR filter control unit. 62, an OFDM modulation unit 64), and a control unit 66.
- FIR Finite Impulse Response
- the antenna 50 receives a radio signal and outputs the received radio signal to the transmission / reception unit 52.
- a radio signal supplied from the transmission / reception unit 52 is radiated to the mobile station 14. Reception and transmission of radio signals are switched in a time-sharing manner based on instructions from the transmission / reception unit 52.
- the transmission / reception unit 52 includes a low noise amplifier, a power amplifier, a local oscillator, a mixer, and a filter.
- a radio signal input from the antenna 50 is amplified by a low noise amplifier, further down-converted to an intermediate frequency signal, and then output to the OFDM signal processing unit 54.
- the intermediate frequency signal input from the OFDM signal processing unit 54 is up-converted into a radio signal, amplified to a transmission output level by a power amplifier, and then supplied to the antenna 50.
- the OFDM signal processing unit 54 includes an FIR filter 56, an OFDM demodulation unit 58, a subcarrier number detection unit 60, an FIR filter control unit 62, and an OFDM modulation unit 64.
- the FIR filter 56 is a band pass filter having a variable width pass band corresponding to the upper limit number of subcarriers constituting one subchannel.
- the FIR filter 56 outputs only the signals included in the pass band among the intermediate frequency signals input from the transmission / reception unit 52 to the OFDM demodulation unit 58.
- the pass band of the FIR filter 56 is controlled by the FIR filter control unit 62 described later so that the signal of the mobile station 14 is separated from the received signal. However, until the connection request signal from the mobile station 14 is received, the pass bandwidth of the FIR filter 56 is maintained at a bandwidth corresponding to the initial number of subcarriers (hereinafter referred to as “initial bandwidth”).
- the OFDM demodulator 58 includes an A / D converter, an FFT unit, and a symbol demapper.
- the intermediate frequency signal input from the FIR filter 56 is converted into a digital signal by the A / D converter, and converted into each subcarrier component of the complex symbol sequence by Fourier transform executed in the FFT unit.
- Each subcarrier component of the complex symbol sequence is converted into a symbol sequence by parallel-serial conversion, decoded into a data bit sequence (received data) according to the symbol modulation method by the symbol demapper, and then output to the control unit 66.
- the subcarrier number detection unit 60 detects the number of subcarriers of the TCCH used for transmission of the connection request signal based on the received signal. For example, among the subcarrier components of the complex symbol sequence related to the connection request signal acquired by the OFDM demodulator 58 when the first radio signal (connection request signal) is received from the mobile station 14 on the TCCH, the signal The number of subcarrier components whose intensity is a predetermined value or more may be detected as the number of TCCH subcarriers.
- the FIR filter control unit 62 controls the pass bandwidth of the FIR filter 56 by changing the voltage applied to the control terminal of the FIR filter 56. As described above, the FIR filter control unit 62 maintains the pass bandwidth of the FIR filter 56 at the initial bandwidth until the connection request signal from the mobile station 14 is received (see FIG. 6A).
- the FIR filter control unit 62 changes the pass bandwidth of the FIR filter 56 according to the number of subcarriers detected by the subcarrier number detection unit 60. To do. For example, if the received connection request signal is transmitted using the initial number of subcarriers shown in FIG. 5A, FIR filter control unit 62 maintains the pass bandwidth of FIR filter 56 as it is (see FIG. 6A). ). On the other hand, if the received connection request signal is transmitted using the subcarrier shown in FIG. 5B, the FIR filter control unit 62 reduces the pass bandwidth of the FIR filter 56 to the pass bandwidth shown in FIG. 6B. Thereafter, this pass bandwidth is applied to signals received from the mobile station 14. Thereby, the ratio of noise contained in the signal of the mobile station 14 that passes through the FIR filter 56 is reduced, and the reception quality of the signal (for example, the signal-to-noise ratio) is improved.
- the reception quality of the signal for example, the signal-to-noise ratio
- FIG. 7 is a flowchart showing a link channel establishment process at the time of an incoming call executed by the mobile station 14.
- the mobile station 14 receives a calling signal addressed to itself from the base station 12 by PCH (S200), it transmits a connection request signal to the base station 12 by TCCH (S202). Thereafter, the mobile station 14 monitors whether or not the connection response signal from the base station 12 is received on the SCCH (S204).
- the connection response signal is received within a predetermined time after transmitting the connection request signal (S204: Y)
- the link channel establishment with the base station 12 is completed.
- the mobile station 14 transmits an allocation confirmation signal to the base station 12 using the ICH (ICCH) notified by the connection response signal (S206), and starts communication with the base station 12 (S208).
- ICH ICH
- the mobile station 14 except for the case where the number of retransmissions of the connection request signal reaches the predetermined number (S210: Y). Decreases the number of subcarriers of the transmission channel used for TCCH and subsequent communications by one or more (S212), and increases the transmission power per subcarrier by the power corresponding to the decrease in the number of subcarriers (S214). Then, the mobile station 14 retransmits the connection request signal to the base station 12 using the TCCH (S216), and executes the processes after S204.
- FIG. 8 is a flowchart showing a link channel establishment process at the time of an incoming call executed by the base station 12.
- the base station 12 transmits a call signal simultaneously to the mobile stations 14 located in the communication area by PCH (S300).
- PCH PCH
- S302 the number of subcarriers constituting the TCCH is detected, and the number of subcarriers is the initial number determined by the mobile communication system 10. It is determined whether or not they are the same (S304).
- the base station 12 transmits the ICH to the mobile station 14 using the SCCH without changing the pass bandwidth of the FIR filter 56.
- a connection response signal including is transmitted (S308).
- the connection including ICH A response signal is transmitted (S308).
- the base station 12 starts communication with the mobile station 14 (S312).
- the reach (uplink budget) of the radio signal transmitted from the mobile station 14 to the base station 12 is improved, and the communication area of the base station 12 can be expanded. Further, since the signal reception quality at the base station 12 is improved, the communication area of the base station 12 can be further expanded.
- the present invention is not limited to the above embodiment.
- the present invention is not limited to mobile communication systems that use both the TDMA / TDD scheme and the OFDMA scheme, and can be widely applied to communication systems that employ a multicarrier communication scheme.
- the number of subcarriers in the downlink direction may be either constant or variable.
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Abstract
Description
Claims (5)
- 基地局装置に対し複数のサブキャリアを用いて無線信号を送信する移動局装置であって、
前記基地局装置に対して接続要求信号を送信する接続要求送信手段と、
前記接続要求送信手段が前記接続要求信号を送信してから所定時間以内に前記基地局装置からの接続応答信号が受信されるか否かを検出する接続応答検出手段と、
前記所定時間以内に前記接続応答信号が受信されない場合に、前記基地局装置に対する無線信号の送信に用いる前記サブキャリアの数を減少させるとともに該減少分に対応する電力だけサブキャリア当たりの送信電力を増加させ、前記接続要求送信手段に前記接続要求信号を再送させる送信制御手段と、
を含むことを特徴とする移動局装置。 - 請求の範囲第1項に記載の移動局装置において、
前記サブキャリア当たりの送信電力は、所定の送信電力上限値を前記サブキャリアの数で除算して得られる、
ことを特徴とする移動局装置。 - 請求の範囲第1項または第2項に記載の移動局装置において、
前記送信制御手段は、前記接続要求信号の再送回数をカウントする手段をさらに含み、前記接続要求信号の再送回数が所定回数に達した場合に、前記接続要求送信手段による前記接続要求信号の再送を制限する、
ことを特徴とする移動局装置。 - 請求の範囲第1項に記載の移動局装置において、
前記移動局装置は、前記基地局装置に対し直交周波数分割多重方式により無線信号を送信する、
ことを特徴とする移動局装置。 - 基地局装置に対し複数のサブキャリアを用いて無線信号を送信する移動局装置における送信電力制御方法であって、
前記基地局装置に対して接続要求信号を送信するステップと、
前記接続要求信号を送信してから所定時間以内に前記基地局装置からの接続応答信号が受信されるか否かを検出するステップと、
前記所定時間以内に前記接続応答信号が受信されない場合に、前記基地局装置に対する無線信号の送信に用いる前記サブキャリアの数を減少させるとともに該減少分に対応する電力だけサブキャリア当たりの送信電力を増加させるステップと、
前記接続要求信号を再送するステップと、
を含むことを特徴とする送信電力制御方法。
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JP5063411B2 (ja) | 2012-10-31 |
KR20100117642A (ko) | 2010-11-03 |
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