WO2001015343A1 - Station de base, terminal de transmission et procede de commande de la puissance de transmission - Google Patents
Station de base, terminal de transmission et procede de commande de la puissance de transmission Download PDFInfo
- Publication number
- WO2001015343A1 WO2001015343A1 PCT/JP2000/005352 JP0005352W WO0115343A1 WO 2001015343 A1 WO2001015343 A1 WO 2001015343A1 JP 0005352 W JP0005352 W JP 0005352W WO 0115343 A1 WO0115343 A1 WO 0115343A1
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- WIPO (PCT)
- Prior art keywords
- transmission
- transmission power
- signal
- power control
- communication terminal
- Prior art date
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Classifications
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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
- H04W52/18—TPC being performed according to specific parameters
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/228—TPC being performed according to specific parameters taking into account previous information or commands using past power values or information
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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
- H04W52/18—TPC being performed according to specific parameters
- H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
- H04W52/288—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account the usage mode, e.g. hands-free, data transmission, telephone
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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
- H04W52/44—TPC being performed in particular situations in connection with interruption of transmission
Definitions
- the present invention relates to a base station device, a communication terminal device, and a transmission power control method used in a digital wireless communication system.
- the CDMA (Code Division Multiple Access) method is one of the multiple access technologies when multiple stations communicate simultaneously in the same frequency band in mobile communications such as car phones and mobile phones. It is. As other technologies, FDMA (Frequency Division Multiple Access: frequency destruction! Multiple access (TDMA) and Time Division Multiple Access (TDMA) are known. This is a method that can achieve higher frequency utilization efficiency and accommodate more users as compared to the technology of the above.
- the desired signal power to noise power must be constant regardless of the location of the communication terminal.
- the uplink (UL: Up Link) from the communication terminal to the base station the signal transmitted from each mobile station is transmitted to the base station in order to reduce interference with adjacent stations using the same frequency.
- Each mobile station needs to adjust the transmission power so that the power during reception is constant.
- the transmission carrier frequency differs between the uplink and the downlink (DL: DOWn Link) from the base station to the mobile station. That FDD (Frequency Division Duplex) used method force s.
- Transmission power control (TPC) in CD MA / FDD generally involves measuring the received power at the base station and instructing the mobile station to increase or decrease the transmitted power based on the received power. Used.
- transmission may stop for a while.
- the base station may adopt a compressed mode in which a transmission stop period is provided overnight.
- the transmission power control value immediately before the transmission is suspended and the transmission is restarted in order to not perform transmission power control during the transmission suspension period.
- An object of the present invention is to provide a base station apparatus, a communication terminal apparatus, and a transmission power control method that can quickly return a transmission power value to an ideal value after transmission is resumed even when transmission is stopped for a while. It is to be.
- the subject of the present invention is to compensate for the difference between the signal quality of the downlink and the desired quality of the downlink as an uplink signal in a slot immediately before resumption of transmission in a situation where signal transmission is not performed.
- TPC bit transmission power control information
- transmission power can be quickly converged to an ideal value, and a compressed mode provided for monitoring a different carrier is provided. And when that transmission resumes It is possible to avoid degradation of user quality or increase in interference with other users due to the transmission power error of the user.
- the present invention can be applied to a situation other than the compressed mode in which signal transmission is not performed for a predetermined time.
- FIG. 1 is a block diagram showing a configuration of a base station apparatus according to Embodiment 1 of the present invention
- FIG. 2 is a block diagram showing a configuration of a communication terminal apparatus according to Embodiment 1 of the present invention
- FIG. 3 is a flowchart of a transmission power control method in the base station apparatus according to Embodiment 1 of the present invention.
- FIG. 4 is a flowchart of a transmission power control method in the communication terminal apparatus according to Embodiment 1 of the present invention.
- FIG. 5A is a diagram for explaining a transmission power control method of the present invention.
- FIG. 5B is a diagram for explaining the transmission power control method of the present invention.
- FIG. 6 is a diagram showing a slot configuration of a signal used in the transmission power control method of the present invention.
- FIG. 7 is a flowchart of a transmission power control method in a base station apparatus according to Embodiment 2 of the present invention.
- FIG. 8 is a flowchart of a transmission power control method in a communication terminal apparatus according to Embodiment 2 of the present invention.
- FIG. 9 is a diagram showing a slot configuration of a signal used in the transmission power control method according to Embodiment 2 of the present invention.
- FIG. 10 is a block diagram showing a configuration of a communication terminal apparatus according to Embodiment 3 of the present invention.
- FIG. 11 is a flowchart of a transmission power control method in a base station apparatus according to Embodiment 3 of the present invention.
- FIG. 12 shows transmission power control in a communication terminal apparatus according to Embodiment 3 of the present invention.
- FIG. 13 is a diagram for explaining a frame configuration of a compressed mode
- FIG. 14 is a diagram for explaining a transmission power control method in a communication terminal apparatus according to Embodiment 3 of the present invention
- FIG. 15 is a diagram for explaining transmission in the compressed mode in Embodiment 4 of the present invention.
- FIG. 16 is a block diagram showing a configuration of a base station apparatus according to Embodiment 5 of the present invention.
- FIG. 17 is a block diagram showing a configuration of a communication terminal device according to Embodiment 6 of the present invention.
- FIG. 18 is a block diagram showing a configuration of a communication terminal apparatus according to Embodiment 7 of the present invention.
- FIG. 1 is a block diagram showing a configuration of a base station apparatus according to Embodiment 1 of the present invention.
- a signal from a communication terminal apparatus received via an antenna 101 is subjected to predetermined processing such as frequency conversion by a radio reception unit 102.
- the received signal after the above-described predetermined processing is demodulated by demodulation section 103.
- the demodulated signal is obtained as UL reception data and sent to the SIR measuring section 104.
- the SIR measuring section 104 measures SIR from the demodulated signal.
- the measured SIR is compared with the UL one-get SIR in the comparator 105. Specifically, a subtraction process is performed between the measured SIR and the UL target SIR. That is, the comparison unit 105 determines how far the measured SIR is away from the evening (ideal) SIR.
- the result of the subtraction in comparison section 105 is sent to TPC bit generation section 106.
- TPC bit generation section 106 it is determined whether the measured SIR is higher or lower than the UL evening gate SIR based on the subtraction result. Then, a TPC bit, which is transmission power control information, is generated based on the determination result. Specifically, if the measured SIR is higher than the UL target SIR, a UL—TPC bit is generated to reduce the transmission power. If the measured SIR is lower than the UL target SIR, the transmission power is reduced. Generates a UL—TPC bit to increase This TPC bit is sent to frame forming section 107.
- the DL-TPC bit is extracted from the signal demodulated by demodulation section 103, and the DL-TPC bit is sent to transmission power control section 108.
- the transmission power control section 108 determines the DL-TPC bit. That is, it is determined whether DL-TPC indicates that transmission power is to be increased or transmission power is to be decreased. Then, this DL-TPC bit is added and stored in transmission power control section 108. Transmission power control section 108 transmits a transmission power control signal to radio transmitting section 110 according to the determination result.
- the frame forming unit 107 forms a transmission frame including the DL transmission data and the TPC bit information.
- the transmission signal having the frame configuration as described above is sent to modulation section 109, and is subjected to digital modulation in the modulation section, and then sent to radio transmission section 110.
- the frame configuration unit 107 since the frame configuration unit 107 is notified of the timing of switching to the compressed mode frame, the frame configuration unit 107 performs the compressed mode frame configuration according to the timing.
- Radio transmitting section 110 performs predetermined radio transmission processing on the modulated transmission signal. At this time, the transmission power is controlled according to the transmission power control signal transmitted from transmission power control section 108. The signal subjected to the wireless transmission processing is transmitted to the communication terminal device via antenna 101 in a state where the transmission power is controlled.
- FIG. 2 is a block diagram showing a configuration of the communication terminal device according to Embodiment 1 of the present invention.
- a signal from the base station apparatus received via antenna 201 is subjected to predetermined processing such as frequency conversion by radio reception section 202. Up The received signal after the predetermined processing is demodulated by demodulation section 203. The demodulated signal is obtained as DL reception data and sent to SIR measurement section 204.
- SIR measuring section 204 measures SIR from the demodulated signal.
- the measured SIR is compared with a DL evening gate SIR in a comparison unit 205. Specifically, a subtraction process is performed between the measured SIR and the DL one-get SIR. In other words, the comparison unit 205 determines how far the measured SIR is from the evening get (ideal) SIR.
- the subtraction result in comparison section 205 is sent to TPC bit generation section 206.
- TPC bit generation section 206 it is determined whether the measured SIR is higher or lower than the DL target SIR based on the subtraction result. Then, a TPC bit, which is transmission power control information, is generated based on the determination result. Specifically, if the measured SIR is higher than the DL one-gate SIR, a DL—TPC bit is generated to reduce the transmission power, and if the measured SIR is lower than the DL target SIR. In this case, a DL-TPC bit for increasing the transmission power is generated. This TPC bit is sent to frame configuration section 207.
- a UL-TPC bit is extracted from the signal demodulated by demodulation section 203, and this UL-TPC bit is sent to transmission power control section 208.
- Transmission power control section 208 determines the UL-TPC bit. That is, it is determined whether UL-TPC indicates that transmission power is to be increased or transmission power is to be decreased.
- the UL-TPC bits are added and stored in transmission power control section 208.
- Transmission power control section 208 transmits a transmission power control signal to radio transmission section 210 according to the determination result.
- the frame forming unit 207 forms a transmission frame including the UL transmission data and the TPC bit information.
- the transmission signal thus framed is sent to modulation section 209, and is digit-modulated by the modulation section before being sent to radio transmission section 210.
- the frame configuration unit 207 is notified of the compressed mode instruction information from the base station apparatus at the timing of making the frame in the compressed mode. Therefore, the communication terminal device can know the start and end timings of the transmission suspension period in the compressed mode.
- Radio transmitting section 210 performs a predetermined radio transmission process on the modulated transmission signal. At this time, the transmission power is controlled according to the transmission power control signal transmitted from transmission power control section 208. The signal subjected to the wireless transmission processing is transmitted to the base station apparatus via the antenna 201 with the transmission power controlled.
- the compressed mode is a mode in which the transmission time in a certain frame is compressed to provide a non-transmission period (a period during which signal transmission is stopped).
- a non-transmission period a period during which signal transmission is stopped.
- the transmission time is compressed in the first seven slots of one frame (15 slots). For this reason, the transmission rate is higher than the normal frame.
- the latter eight slots of the frame are non-transmission periods. Using this non-transmission period, other channels can be monitored. Note that, in the present embodiment, the last eight slots of the frame are set as non-transmission periods, but the number of slots is not particularly limited.
- FIG. 3 is a flowchart of a transmission power control method in the base station apparatus according to Embodiment 1 of the present invention.
- step (hereinafter abbreviated as ST) 301 it is determined whether the transmission mode is the normal mode, the compressed mode, or the recovery mode immediately after the compression mode. This determination can be easily made because the timing of the compressed mode is known in advance on the base station apparatus side.
- the transmission mode is the normal mode
- the DL-TPC bit is extracted from the received signal, and the transmission power is controlled according to the DL-TPC bit. That is, 0 1 ⁇ transmission power is DL-TPC (1 dB or 1 dB) (ST 302).
- a UL-TPC bit is generated based on the SIR of the received signal from the communication terminal device (ST 307). Then, transmission is performed with the transmission power ⁇ obtained in S ⁇ 302 ⁇ (ST 308).
- the transmission power control in the normal mode is performed as shown in FIG.
- SIR measurement is performed on the communication terminal using a known signal in one slot of DL, for example, a pilot signal (PL), and the TPC bit is generated from the measurement result, which is mounted on UL and transmitted.
- PL pilot signal
- the TPC bit is transmitted on the Q channel because the UL is IQ multiplexed. Then, this TPC bit is reflected on the base station apparatus side. The reflection of the TPC bit is at the Y point of DL in FIG. Therefore, the slot timing is not the same as the TPC bit reflection timing.
- the transmission mode is the compressed mode
- the first seven slots of the compressed frame are a transmission period and the latter eight slots are a non-transmission period, so that the transmission slot is smaller than seven slots. Determine whether or not.
- the DL-TPC bit is extracted from the received signal, and the transmission power is controlled according to the DL-TPC bit. That is, DL transmission power Tx is obtained by adding DL-TPC (1 dB or 11 dB) to transmission power ⁇ at the time of the previous transmission (ST 305). In addition, a UL-TPC bit is generated using the SIR of the signal received from the communication terminal device (ST307). Then, transmission is performed with the DL transmission power Tx obtained in ST 305 (ST 308). On the other hand, if the transmission slot is larger than 7 slots, transmission is not performed because there is no transmission period (ST 306).
- the transmission power control is performed so that the transmission power value converges to the ideal value.
- the received signal The DL_TPC bit is extracted from, and transmission power control is performed according to the DL_TPC bit. That is, DL transmission power Tx is obtained by adding DL_TPC * A to transmission power ⁇ at the time of the previous transmission (ST 303).
- a UL—TPC bit is generated based on the SIR of the signal received from the communication terminal (ST 307). Then, transmission is performed with the DL transmission power Tx determined in ST 303 (ST 308).
- D L-TP C * A may be ⁇ 1 dB, ⁇ 1 dB or more, or an adaptive value.
- FIG. 4 is a flowchart of a transmission power control method in the communication terminal apparatus according to Embodiment 1 of the present invention.
- ST401 it is determined whether the transmission mode is the normal mode, the compressed mode, or the recovery mode immediately after the compressed mode. This determination can be made easily because the compressed mode timing is notified from the base station apparatus in advance.
- the UL-TPC bit is extracted from the received signal and transmission power control is performed according to the UL-TPC bit. That is, UL transmission power Ty is obtained by adding UL-TPC (1 dB or -1 dB) to UL transmission power Ty in the previous transmission (ST 402). Also, in S111 of the received signal from the base station equipment, 01? . A bit is generated (ST 409). Then, transmission is performed at the UL transmission power Ty determined in ST 402 (ST 410). The transmission power control in the normal mode is performed as shown in FIG.
- SIR measurement is performed by a communication terminal using a known signal in one slot of the UL Q channel, for example, a pilot signal (PL), and a TPC bit is generated from the measurement result, which is mounted on the DL. And send (solid arrow). And this TP C The cut is reflected on the communication terminal side.
- the reflection of the TPC bit is at UL Z in FIG. Therefore, slot timing and TPC bit reflection timing are not the same.
- the transmission mode is the compressed mode
- the UL-TPC bit is extracted from the received signal, and the transmission power is controlled according to the UL-TPC bit. That is, the UL transmission power Ty is obtained by adding UL-TPC (1 dB or 1 1 dB) to the transmission power Ty at the time of the previous transmission (ST405).
- S11 ⁇ of the received signal from the base station equipment is 01 ⁇ -d? Generates 0 bits (ST409). Then, transmission is performed with the UL transmission power Ty determined in ST 405 (ST 410). If the number of transmission slots is 7 to 13, the transmission is not performed because there is no transmission period (ST 408).
- a DL-TPC bit is generated (ST406).
- the DL channel quality is measured by some method, and the DL-TPC bit is generated based on the measurement result.
- PL and DL-TPC bits which are known signals that are control signals for compensating for an error from a desired (ideal) transmission power value, are transmitted at UL transmission power Ty (ST407).
- PL and DL-TPC bits are transmitted at UL transmission power Ty (ST407).
- the proportion of the TPC bit in the transmission signal becomes higher than in normal data transmission, so that the transmission of the TPC bit is performed.
- the transmission rate is increased, and the TPC bit can be transmitted to the base station device more accurately and in a less error-prone state. As a result, the transmission power control in the base station device can be performed reliably.
- the transmission power control information when the transmission rate is increased, by adopting a configuration in which the transmission signal repeatedly includes the transmission power control information, the transmission power control information is transmitted in a state resistant to errors. Thus, the transmission power control information can be accurately received in the base station apparatus.
- the transmission power control information is configured to include the step width information, so that a larger signal amount (number of bits) than usual is allocated to the transmission power control information. Therefore, information on the number of control steps in transmission power control can be carried. For this reason, transmission power control can be performed dynamically in the recovery mode from transmission restart to quickly converge the transmission power value to the ideal value.
- the transmission power control is performed in advance when transmission is resumed by using the D L-TPC bit.
- the transmission power control is performed in advance at the time of resuming transmission, it is possible to shorten the time until the transmission power converges to the ideal value. That is, since transmission power control is performed before transmission is resumed and compensation can be performed in advance, the amount of compensation up to an ideal value can be reduced. As a result, it is possible to quickly increase the signal quality of a user or reduce interference with other users.
- the PL is transmitted in the UL of the slot immediately before the restart of transmission, the data quality is improved in the base station device during demodulation overnight. That is, when demodulation is performed overnight using PLs over a plurality of frames, the number of PLs is increased, and thus the quality at the time of demodulation is improved.
- a known signal is transmitted from a base station apparatus to a communication terminal apparatus in a slot immediately before transmission restart, and transmission power control information obtained based on the quality of the known signal is transmitted to the communication terminal apparatus. From the base station apparatus to the base station apparatus, and based on the transmission power control information, performing transmission power control that compensates for the difference between downlink signal quality and downlink desired quality.
- the base station device and the communication terminal device according to the present embodiment have the same configuration as that of the first embodiment, and thus description thereof will be omitted.
- a transmission power control method performed by the base station apparatus and the communication terminal apparatus according to the present embodiment will be described.
- a case will be described in which a period during which signal transmission is not performed for a while is a transmission suspension period in the compressed mode.
- FIG. 7 is a flowchart of a transmission power control method in the base station apparatus according to Embodiment 2 of the present invention.
- ST701 it is determined whether the transmission mode is the normal mode, the compressed mode, or the recovery mode immediately after the compressed mode. This determination can be easily made because the compressed mode timing is known in advance on the base station apparatus side.
- the transmission mode is the normal mode
- the DL-TPC bit is extracted from the received signal, and the transmission power is controlled according to the DL-TPC bit. That is, 0
- the transmission power is the DL transmission power Tx from the previous transmission plus DL-TPC (1 dB or _l dB) (ST 702).
- a UL-TPC bit is generated based on the SIR of the received signal from the communication terminal device (ST 709).
- transmission is performed with the transmission power Tx determined in ST 302 (ST 710).
- the transmission power control in the normal mode is performed as shown in FIG.
- SIR measurement is performed by a communication terminal using only a known signal in one DL slot, for example, a pilot signal (PL), and a TPC bit is generated from the measurement result, which is mounted on the UL and transmitted. Yes (dotted line arrow).
- the TPC bit is transmitted on the Q channel because the UL is IQ-multiplexed. Then, this TPC bit is reflected on the base station apparatus side.
- the slot timing and TPC bit reflection timing are not the same.
- the transmission mode is the compressed mode
- the DL-TPC bit is extracted from the received signal, and the transmission power is controlled according to the DL-TPC bit. That is, the 0 transmission power is obtained by adding DL-TPC (1 dB or 11 dB) to the transmission power Tx at the time of the previous transmission (ST 705). Also, at S11 of the received signal from the base station apparatus, 1; 1-bit pudding bit is generated (ST709). Then, transmission is performed at DL transmission power Tx determined in ST 705 (ST 710). If the number of transmission slots is 7 to 13, the transmission is not performed because there is no transmission period (ST 708). If the number of transmission slots is 14, the transmission power is controlled according to the DL-TPC bit.
- DL transmission power Tx is obtained by adding DL-TPC (18 or -118) to transmission power ⁇ at the time of transmission immediately before transmission stop (ST 706). Then, only the PL which is a known signal is transmitted with the transmission power determined in ST 706 (ST 707).
- the transmission power control is performed so that the transmission power value converges to the ideal value. Specifically, it extracts the DL-TPC bit from the received signal and performs transmission power control according to the DL-TPC bit. That is, DL transmission power Tx is obtained by adding DL-TPC * A to transmission power Tx at the time of the previous transmission (ST 703). Then, a UL-TPC bit is generated based on the SIR of the received signal from the base station apparatus (ST709). Next, transmission is performed with the DL transmission power Tx obtained in ST 705 (ST710). There is no limitation on the method of convergence to the ideal transmission power value when recovering the compressed mode, and various methods can be applied.
- a normal one-step transmission power control width of 1 dB may be used, and a one-step transmission power control width set to exceed 1 dB.
- Transmission power control that adaptively changes the transmission power control width in one step may be used. That is, D L-TP C * A may be ⁇ 1 dB, may be ⁇ l dB or more, or may be an adaptive value.
- FIG. 8 is a flowchart of a transmission power control method in the communication terminal apparatus according to Embodiment 2 of the present invention.
- ST801 it is determined whether the transmission mode is the normal mode, the compressed mode, or the recovery mode immediately after the compressed mode. This determination can be made easily because the compressed mode timing is notified from the base station apparatus in advance.
- the UL-TPC bit is extracted from the received signal, and transmission power control is performed according to the UL-TPC bit.
- the UL transmission power Ty is the UL transmission power Ty of the previous transmission and UL— TPC (1 dB or 1 dB) (ST 802).
- S11 of the received signal from the base station equipment is 01 ⁇ -? Generates 0 bit (ST8 ⁇ 9). Then, transmission is performed with the transmission power Ty determined in ST 402 (ST 810).
- the transmission power control in the normal mode is performed as shown in FIG.
- SIR measurement is performed at the communication terminal using only a known signal in one slot of the UL Q channel, for example, a pilot signal (PL), and a TPC bit is generated from the measurement result, and this is transmitted to DL Mount and send (solid arrow). Then, the TPC bit is reflected on the communication terminal side.
- PL pilot signal
- the slot timing is not the same as the TPC bit reflection timing.
- the transmission mode is the compressed mode
- the first seven slots in the compressed frame are the transmission period, and the latter eight slots are the non-transmission period, so that the transmission slot is changed from 0 slot to 6 slots.
- the UL-TPC bit is extracted from the received signal, and the transmission power is controlled according to the UL-TPC bit. That is, UL transmission power Ty is obtained by adding UL-TPC (1 dB or 11 dB) to transmission power Ty in the previous transmission (ST 805). Also, a DL-TPC bit is generated based on the SIR of the received signal from the base station device (ST809). Then, transmission is performed with the UL transmission power Ty determined in ST 405 (ST 810). If the number of transmission slots is 7 to 13, the transmission is not performed because there is no transmission period (ST808).
- the DL-TP is determined based on the SIR obtained from the known signal transmitted in one slot immediately before restarting the transmission from the base station apparatus.
- a C bit is generated (ST806).
- the PL and DL-TPC bits which are known signals, which are control signals for compensating for an error from a desired (ideal) transmission power value, are transmitted with the UL transmission power Ty (ST807).
- the TPC bit occupies a higher percentage of the transmitted signal during normal data transmission, so that the TPC bit transmission rate is increased and the error rate of the base station apparatus can be more accurately detected.
- TPC bits can be transmitted in a difficult state, and as a result, transmission power control in the base station device can be performed reliably.
- the transmission power control is performed in advance when transmission is resumed by using the D L-TPC bit.
- transmission power control is performed in advance before transmission is resumed, and compensation can be performed in advance, so that the amount of compensation up to the ideal value can be reduced.
- the signal quality of the user can be quickly improved, or interference with other users can be reduced.
- the transmission power ratio of a channel common to all users for example, a known signal of a common pilot channel and a known signal of an individual physical channel in the compressed mode, for example, a known signal obtained from a pilot signal
- transmission power control is performed based on transmission power control information to compensate for the difference between downlink signal quality and desired downlink quality.
- the base station apparatus has the same configuration as that of the first embodiment, and a description thereof will not be repeated.
- the configuration of the communication terminal apparatus according to the present embodiment will be described using FIG.
- a signal from a base station apparatus received via antenna 1001 is subjected to predetermined processing such as frequency conversion by radio reception section 1002.
- the received signal after the above-described predetermined processing is demodulated by analog demodulation section 103.
- the analog demodulated signal is output to the common pilot digital demodulator 1004,
- the data is sent to the physical digital demodulation unit 1005, where it is digit-demodulated for each channel.
- Each of the digitally demodulated signals is obtained as DL reception data, and sent to the RD (power ratio of dedicated data and common pilot calculation unit 101 3; DC calculation unit 101)
- the transmission power ratio of the two digitally demodulated signals is calculated, and this transmission power ratio is stored in the memory 110-14.
- This transmission power ratio is appropriately determined by, for example, in a slot different from the slot in which the transmission power ratio was measured, the transmission power of the signal digitally demodulated by the common pilot digital demodulator 104 and the multiplier 101. The transmission power of the signal for the individual physical at that time is obtained. Information on the transmission power of the individual physical signal is sent to the SIR measuring section 106.
- the signal subjected to digital demodulation by the individual physical digital demodulation unit 1005 is sent to the SIR measurement unit 1006.
- the SIR measuring section 106 measures SIR from the digitally demodulated signal.
- the measured SIR is compared with the DL target SIR in a comparator 107. Specifically, a subtraction process is performed between the measured SIR and the DL target SIR. In other words, the comparison unit 107 determines how far the measured SIR departs from the evening (ideal) SIR.
- the result of the subtraction in the comparison unit 1007 is sent to the TPC bit generation unit 1008.
- a UL-TPC bit is extracted from the signal demodulated by the dedicated physical digital demodulation unit 1005, and the UL-TPC bit is sent to the transmission power control unit 110.10.
- the transmission power control unit 11010 determines the UL-TPC bit. That is, it is determined whether UL-TPC indicates that transmission power is to be increased or transmission power is to be decreased. Then, the UL-TPC bit is added and stored in the transmission power control unit 110.
- the transmission power control unit 11010 transmits a transmission power control signal to the wireless transmission unit 1012 according to the determination result.
- the frame composing section 109 forms a transmission frame including the UL transmission data and the TPC bit information.
- the transmission signal having such a frame configuration is sent to modulation section 1011, where it is digit-modulated by the modulation section, and then sent to radio transmission section 11012.
- the base station apparatus notifies the frame configuration section 109 of the timing of forming the compressed mode frame from the compressed mode instruction information, so that the communication terminal apparatus side operates in the compressed mode.
- the start and end timings of the transmission suspension period can be known.
- wireless transmission section 101 predetermined wireless transmission processing is performed on the modulated transmission signal.
- the transmission power is controlled according to the transmission power control signal transmitted from transmission power control section 11010.
- the signal subjected to the radio transmission processing is transmitted to the base station apparatus via antenna 1001 in a state where the transmission power is controlled.
- a transmission power control method performed by the base station apparatus and the communication terminal apparatus according to the present embodiment will be described.
- a case will be described in which a period during which signal transmission is not performed for a while is a transmission suspension period in the compressed mode.
- FIG. 11 is a flowchart of a transmission power control method in the base station apparatus according to Embodiment 3 of the present invention.
- ST111 it is determined whether the transmission mode is the normal mode, the compressed mode, or the recovery mode immediately after the compressed mode. This determination can be made easily because the compressed mode timing is known in advance on the base station apparatus side.
- the transmission mode is the normal mode
- the DL-TPC bit is extracted from the received signal, and the transmission power is controlled according to the DL-TPC bit. That is, the 01 ⁇ transmission power is obtained by adding DL-TPC (1 dB or 11 dB) to the DL transmission power Tx at the time of the previous transmission (ST 1102).
- the UL-TPC bit is generated by the SIR of the signal received from the communication terminal device (ST 1107). Then, transmission is performed at the transmission power Tx determined in ST 1102 (ST 1 108). If the transmission mode is the compressed mode, it is first determined whether or not the transmission slot is smaller than 7 slots (ST 1104). This is to determine whether the slot is in a transmission period or a non-transmission period. In the present embodiment, as shown in FIG. 13, the first seven slots of the compressed frame are the transmission period, and the latter eight slots are the non-transmission period, so the transmission slot is smaller than seven slots. Determine whether or not.
- the transmission slot is smaller than 7 slots, extract the DL-TPC bit from the received signal and set it to 01 ⁇ -D? ⁇ Perform transmission power control according to the bit. That is, the DL transmission power Tx is obtained by adding DL-TPC (1 dB or 11 dB) to the transmission power Tx at the time of the previous transmission (ST 1105). In addition, a UL-TPC bit is generated by the SIR of the signal received from the communication terminal device (ST111). Then, transmission is performed with the DL transmission power Tx determined in ST 1105 (ST 1108). On the other hand, if the transmission slot is larger than 7 slots, transmission is not performed because there is no transmission period (ST 1106).
- the transmission power control is performed so that the transmission power value converges to the ideal value. Specifically, it extracts DL-TPC bits from the received signal and performs transmission power control according to the DL_TPC bits. That is, the 01 ⁇ transmission power is obtained by adding DL-TPC * A to the transmission power Tx at the time of the previous transmission (ST 1103). S 113 ⁇ 4 of the received signal from the communication terminal device 11 — 11? A 0 bit is generated (S1108). Then, transmission is performed with the DL transmission power Tx determined in ST 1103 (ST 1109). There is no limitation on the method of convergence to the ideal transmission power value when recovering the compressed mode, and various methods can be applied.
- a normal one-step transmission power control width of 1 dB may be used, and a one-step transmission power control width set to exceed 1 dB.
- Transmission power control that adaptively changes the transmission power control width in one step may be used. That is, DL-TPC * A may be ⁇ 1 dB, ⁇ 1 dB or more, or an adaptive value.
- FIG. 12 is a flowchart of a transmission power control method in the communication terminal apparatus according to Embodiment 3 of the present invention.
- the transmission mode is the normal mode, the compressed mode, or the recovery mode immediately after the compressed mode.
- a UL-TPC bit is extracted from the received signal, and transmission power control is performed according to the UL-TPC bit. That is, the UL transmission power Ty is obtained by adding UL-TPC (1 dB or 11 dB) to the UL transmission power Ty at the time of the previous transmission (ST1202).
- a 01 ⁇ _cutter bit is generated (ST 1211). Then, transmission is performed with the transmission power Ty determined in ST 1202 (ST 1212). If the transmission mode is the compressed mode, first, it is determined how many transmission slots the transmission slot is in (ST 1204).
- the first seven slots of the compressed frame are the transmission period, and the latter eight slots are the non-transmission period. It is determined whether there is a slot, 7 to 13 slots, or 14 slots (A in Fig. 13).
- the transmission slot is from 0 to 6 slots, U The L-TPC bit is extracted, and transmission power control is performed according to the UL-TPC bit. That is, UL transmission power Ty is obtained by adding UL-TPC (1 dB or 11 dB) to transmission power Ty at the time of the previous transmission (ST 1205).
- UL transmission power Ty is obtained by adding UL-TPC (1 dB or 11 dB) to transmission power Ty at the time of the previous transmission (ST 1205).
- it is determined whether the slot is slot 6 (ST 1206) That is, it is determined whether or not the slot is the slot immediately before the stop of signal transmission in the compressed mode. This is because slot 6 is the slot immediately before signal transmission is stopped, so that the known signal of the common channel and the known signal of the dedicated physical channel are both transmitted, and the transmission power ratio (RDC) between the two known signals Is required.
- RDC transmission power ratio
- a DL-TPC bit is generated with the SIR of the received signal from the base station device (ST121-1). Then, transmission is performed with the transmission power Ty determined in ST 1202 (ST 12 12).
- RDC is calculated using the known signal of the common control channel and the known signal of the dedicated physical channel in slot 6 (ST 1207). Then, SIR of the received signal from the base station apparatus is obtained, and a DL-TPC bit is generated (ST1211). Next, transmission is performed with the transmission power Ty determined in ST 1202 (ST 1212).
- ST 1204 if the transmission slot is from slot 7 to slot 13, transmission is not performed (ST 1210). Also, in ST 1204, if the transmission slot is slot 14, a DL-TPC bit is generated using the obtained RDC (ST 1208). Then, only the DL-TPC bit and PL obtained in ST 1208 are transmitted at UL transmission power Ty (ST 1209). As a result, the TPC bit occupies a higher percentage of the transmission signal during normal data transmission, so that the transmission rate of the TPC bit increases, and the base station device can receive more accurate errors. TPC bits can be transmitted in a difficult state, and as a result, transmission power control in the base station apparatus can be performed reliably.
- the transmission power control information (TPC bit) is obtained from the RDC
- the known signal of the common control channel and the known signal of the dedicated physical channel are used in the slot immediately before the stop of transmission (part B (shaded area in Fig. 14)).
- RDC transmission power ratio
- the transmission power (D) of the known signal of the common control channel in the slot (portion C (shaded portion in FIG. 14)) immediately before the restart of transmission is determined.
- the transmission power (E) of the dedicated physical channel immediately before transmission is resumed.
- the SIR is measured using the transmission power (E), and a TPC bit is generated based on the SIR.
- transmission power control is performed in advance when transmission is resumed.
- transmission power control is performed in advance before transmission is resumed, and compensation can be performed in advance, so that the amount of compensation up to the ideal value can be reduced.
- the signal quality of the user can be quickly improved, or interference with other users can be reduced.
- transmission power control information of a dedicated physical channel whose transmission has been stopped is determined using a transmission power ratio and a common known signal that is constantly transmitted, and the transmission power control information is transmitted to the base station apparatus side. Therefore, even if there is no transmission of a known signal during the transmission suspension period from the base station device, transmission power control can be performed in advance when transmission is resumed, and the transmission power converges to the ideal value. The time required for this can be reduced.
- the base station apparatus adds the DL-TPC bit before the transmission is stopped, that is, the DL-TPC bit integrated value up to the slot immediately before the transmission is stopped and the communication terminal apparatus.
- Transmission power control may be performed using the DL_TPC bit obtained from the RDC. Further, the base station apparatus does not use the DL-TPC bit before the transmission is stopped, that is, ignores the DL-TPC bit integrated value up to the slot immediately before the transmission is stopped, and sets the RD in the communication terminal apparatus.
- DL obtained from C—TPC Transmission power control may be performed using only the Since the DL-TPC bit obtained from the RDC on the communication terminal side is information of the latest slot, transmission power control can be performed with high accuracy.
- FIG. 15 is a diagram for explaining transmission in the compressed mode in the present embodiment.
- the compressed mode is adopted, and a transmission stop period is provided between the transmission signal 1501 and the transmission signal 1505.
- the uplink (UL) compressed mode is not adopted and transmission is performed continuously. That is, transmission signals 1502, 1503, 1504, and 1506 are continuously transmitted on the uplink.
- closed-loop transmission power control is performed according to the TPC bit.
- the communication terminal apparatus cannot measure the SIR based on the known signal, so that the TPC bit included in the uplink transmission signal 1503 has low reliability.
- the SIR is measured by the communication terminal device using the common control channel signal of the slot immediately before transmission restart in the compressed mode of the downlink, Based on the measurement result, D W
- the D L—TP C bit is transmitted as an uplink transmission signal 1504.
- the D L-TP C bit has high reliability because it is obtained by measuring S I R from the downlink common control channel signal. Therefore, in the base station apparatus, by performing transmission power control according to the DL-TPC bit transmitted in the transmission signal 1504, accurate transmission power control is performed from the point of restart of transmission. Can be. As described above, even when the base station apparatus does not support the control of the present invention, the transmission power is controlled in advance when the transmission is resumed in the same manner as in the above-described embodiment, so that the transmission power can be reduced to the ideal value. The time required to converge to can be reduced.
- the compressed mode is adopted for both the uplink and the downlink, and the base station apparatus supports the control of the present invention, and the communication terminal apparatus supports the control of the present invention.
- the communication terminal apparatus determines whether or not there is an uplink signal including a DL-TPC bit generated using a downlink signal (common control channel signal) immediately before restarting transmission in the compressed mode. Judge whether or not supports the control of the present invention.
- the uplink signal is transmitted in the slot immediately before the restart of transmission, as described in the above embodiment. By detecting, it is possible to determine whether the communication terminal device supports the control of the present invention.
- FIG. 16 is a block diagram showing a configuration of the base station apparatus according to the present embodiment.
- the base station apparatus shown in FIG. 16 includes an extra signal detection unit 1601 that detects an uplink signal (extra signal) of a slot immediately before resuming transmission.
- the extra signal detecting section 1601 detects the presence or absence of the extra signal by measuring the power of the extra signal, for example.
- the extra signal detector 1601 may measure the quality of the extra signal other than the power. Further, the detection in the extra signal detection section 1601 may be performed by an existing circuit that measures the reception power and reception quality.
- the transmission mode when the transmission mode is the compressed mode, first, it is determined whether or not the transmission slot is smaller than 7 slots, and if the transmission slot is smaller than 7 slots, Then, after demodulating the received signal by demodulation section 103, the DL-TPC bit is extracted, and transmission power control section 108 performs transmission power control according to the DL-TPC bit.
- the SIR measurement section 104 measures the SIR from the demodulated signal, compares the SIR measured by the comparison section 105 with the UL target SIR, and based on the comparison result, the TPC bit generation section 100 6 generates UL—TPC bit. Then, transmission is performed at the transmission power whose transmission power is controlled as described above.
- the extra signal is detected by the extra signal detection unit 1601. For example, an extra signal is measured, and if the measurement result is equal to or greater than a predetermined threshold, the signal is detected as an extra signal. As a result, it is known that the extra signal is transmitted from the communication terminal device, and the base station device can identify that the communication terminal device supports the control of the present invention.
- the base station apparatus if it is determined that the communication terminal apparatus supports the control of the present invention, that is, if an extra signal is detected, the fact is transmitted to the transmission power control unit 108 as a control signal. Sent. Since the DL-TPC bits included in the extra signal have high reliability as described above, the transmission power control unit 108 In, the transmission power is controlled according to the DL-TPC bit included in the extra signal.
- the base station apparatus determines that the communication terminal apparatus does not support the control of the present invention, that is, does not detect an extra signal, the base station apparatus sets the DL-TPC bit of the slot before the transmission stop. Therefore, transmission power control is performed. In this case, there is no difference from the transmission power control in the normal compressed mode.
- the transmission power control is performed so that the transmission power value converges to the ideal value, as in the first embodiment.
- the base station apparatus it is possible to detect a communication terminal apparatus that supports the control of the present invention. Transmission power control can be performed. This allows the transmission power value to quickly converge to the ideal value. In this case, since the communication terminal apparatus supporting the control of the present invention performs the transmission power control of the base station apparatus immediately after the restart of transmission with high reliability, the transmission power value is also quickly converged to the ideal value. Can be made.
- the presence or absence of an extra signal is detected by measuring the power of the extra signal.
- the quality of the extra signal may be measured.
- the compressed mode is adopted for the downlink
- the compressed mode is not adopted for the uplink
- the base station apparatus supports the control of the present invention
- the communication terminal apparatus supports the control of the present invention. Discussed when it is unknown whether I will tell. In this case, it is determined whether or not the communication terminal apparatus is supporting the control of the present invention based on the fixed TPC bit included in the uplink signal during the transmission suspension period in the compressed mode.
- the communication terminal device When the compressed mode is adopted only for the downlink, there is a transmission suspension period in the downlink, and transmission is performed continuously in the uplink. Therefore, regardless of whether or not the communication terminal device supports the control of the present invention, the communication terminal device transmits the uplink signal in the slot immediately before the restart of transmission. Therefore, the method of the fifth embodiment cannot identify whether the communication terminal device supports the control of the present invention. On the other hand, when the downlink is in the transmission suspension period, the UL-TPC bit has low reliability.
- a fixed TPC bit that can be used to identify whether the communication terminal apparatus is controlling the control of the present invention is used as the UL-TPC bit when the downlink is in the transmission suspension period. This makes it possible to determine whether or not the communication terminal device supports the control of the present invention.
- FIG. 17 is a block diagram showing a configuration of the communication terminal device according to the present embodiment.
- the same portions as those in the communication terminal device shown in FIG. 2 are denoted by the same reference numerals as in FIG. 2, and detailed description thereof will be omitted.
- the communication terminal device shown in Fig. 17 is generated using a fixed TPC input section 1701 that inserts a fixed TPC bit into the uplink signal of the slot during the transmission suspension period, and the SIR obtained from the downlink signal.
- a switch 1702 for switching between the TPC bit and the fixed TPC bit in accordance with the compressed mode instruction information is provided.
- the fixed TPC input section 1701 for example, "1" is used for the TPC bit when the control of the present invention is supported, and "0" is set for the TPC bit when the control of the present invention is not supported.
- the TPC bit is transmitted continuously during the transmission suspension period.
- the TPC bit uses "0" for the TPC bit when the control of the present invention is supported, and uses “1" for the TPC bit when the control of the present invention is not supported. May be. Continuously use the same fixed TPC bit By transmitting, the possibility of erroneous use of the fixed TPC bit is reduced, and it is possible to accurately notify the base station apparatus whether the control of the present invention is supported.
- a demodulation section 203 demodulates a received signal, extracts a UL-TPC bit, and transmits a transmission power control section 208 according to a UL-TPC bit. Perform power control.
- the SIR measurement section 204 measures the SIR from the demodulated signal, compares the SIR measured by the comparison section 205 with the DL one-get SIR, and based on the comparison result, the TPC bit generation section 206 DL — generate TPC bits.
- switch 1702 is set so that the TPC bit from TPC bit generation section 206 is sent to frame configuration section 207. Then, transmission is performed with the transmission power controlled as described above.
- switch 1702 is switched so that the TPC bit from fixed TPC insertion section 1701 is sent to frame configuration section 207.
- Switch 1702 is switched at a timing corresponding to the downlink transmission suspension period according to the compressed mode instruction information.
- the switch 1702 allows the TPC bit from the TPC bit generation unit 206 to be sent to the frame configuration unit 207 again at a timing corresponding to the end of the predetermined transmission suspension period. Can be switched.
- the fixed TPC bit is transmitted from fixed TPC insertion section 1701 to frame configuration section 207, and UL transmission data and TPC bit are transmitted in frame configuration section 207. Is formed into a frame, and then the frame-structured transmission signal is modulated by the modulation section 209 and transmitted from the antenna 201 to the base station apparatus via the radio transmission section 210.
- the communication terminal apparatus uses “1” for the TPC bit when the control of the present invention is supported, and sets “0” for the TPC bit when the control of the present invention is not supported.
- the TPC bit is transmitted continuously during a period corresponding to the transmission suspension period.
- a DL-TPC bit is generated using a downlink signal (common control channel signal) immediately before restart of transmission in the compressed mode. Then, it transmits to the base station apparatus as an uplink signal including the highly reliable DL-TPC bit.
- the base station apparatus first demodulates an uplink signal from the communication terminal apparatus and extracts a fixed TPC bit. This fixed TPC bit is sent to the transmission power control unit.
- the transmission power control unit determines whether the communication terminal device supports the control of the present invention based on whether the fixed TPC bit is “1” or “0”.
- the base station apparatus if it is determined that the communication terminal apparatus supports the control of the present invention, that is, if the fixed TPC bit “1” is obtained during the transmission stop period, Transmission power control is performed using the highly reliable DL-TPC bit included in the uplink signal of the slot.
- the communication terminal apparatus determines that the control of the present invention has not been performed, that is, when the fixed TPC bit “0” is acquired during the transmission stop period, Transmit power control is performed according to the DL—TPC bit of the slot. In this case, there is no difference from the transmission power control in the normal compressed mode.
- the transmission power control is performed so that the transmission power value converges to the ideal value, as in the first embodiment.
- the base station apparatus supports the control of the present invention by the fixed TPC bit transmitted by the communication terminal apparatus during the period corresponding to the transmission suspension period. It is possible to identify the communication terminal device that is performing communication, and to perform highly reliable transmission power control on this communication terminal device immediately after restarting transmission. This allows the transmission power value to quickly converge to the ideal value. In this case, the control of the present invention is supported. Since the communication terminal apparatus with high reliability controls the transmission power of the base station apparatus immediately after the restart of transmission, the transmission power value can also quickly converge to the ideal value.
- the control method of the present invention is introduced, an extra signal is transmitted in a slot immediately before transmission is resumed.
- This extra signal is meaningless unless it is highly reliable, and if it is not highly reliable, power is wasted. Therefore, the power consumption of the communication terminal device can be reduced by selecting the communication terminal device so as to introduce the control method of the present invention only when the extra signal is highly reliable. Can be. For example, when the Doppler frequency is very high, or when fading is very fast, the reliability of the extra signal is considered to be low. In such a case, the control of the present invention is performed by the communication terminal device.
- the extra signal is transmitted in the slot immediately before the restart of the transmission, and the control to perform the transmission power control by the highly reliable TPC when the transmission is restarted is turned off.
- the base station apparatus does not support the control of the present invention. Turn off the control of the invention.
- the communication terminal device performs the control of the present invention.
- the communication terminal device monitors the Doppler frequency and performs the control of the present invention at 0 N / 0 FF depending on the level of the Doppler frequency.
- FIG. 18 is a block diagram showing the configuration of the communication terminal device according to Embodiment 2 of the present invention.
- the communication terminal device shown in FIG. 18 measures the Doppler frequency of the downlink signal by using a Doppler frequency measuring unit 1801 and a Doppler frequency measuring unit 1801 A determination unit 1802 for determining ON / OFF of the control of the present invention based on the determined Doppler frequency.
- the Doppler frequency of the downlink signal is monitored. Specifically, the Doppler frequency measuring section 1801 measures the Doppler frequency of the received signal. Since a known method can be used for measuring the Doppler frequency, a specific method is omitted. The result of the measurement of the Doppler frequency is sent to the judging section 1802.
- the determination unit 1802 determines whether to perform the control of the present invention based on the measurement result of the Doppler frequency. For example, a threshold value is set in advance for the Doppler frequency, and if the measured Doppler frequency exceeds the threshold value, the control of the present invention is set to OFF. That is, the control signal is sent from the determination unit 1802 to the switch 1702, the insertion of the TPC bit from the fixed TPC insertion unit 1701 is stopped, and the TPC bit is output only from the TPC bit generation unit 206. Switch 1702 so that the frame is sent to the frame composing section 207.
- the control of the present invention is set to ON. That is, the control signal is sent from the determination unit 1802 to the switch 1702, and the TPC bit is input from the fixed TPC insertion unit 1 ⁇ 01 1 as appropriate (slot immediately before transmission is restarted) to generate the TPC bit.
- the switch 1702 is switched so that the TPC bit is sent to the frame composing section 207 together with the section 206.
- the power of the communication terminal device can be effectively used.
- the case where 0 NZO FF of the control of the present invention is performed according to the level of the frequency of the Doppler is described. It is also possible to monitor whether or not the vehicle is within the vehicle or whether fast fusing is performed, and perform ONZ OFF of the control of the present invention based on the information or the like.
- the communication terminal Even if the device supports or does not support the control of the present invention, the base station device cannot perform the control of the present invention, that is, cannot identify the extra signal. In this case, there is no difference from the control in the normal compressed mode. However, if the communication terminal device does not use the compressed mode, or if continuous transmission is performed, an extra signal is sent in the slot immediately before transmission restarts, so that the communication terminal device can resume transmission from the base station device when transmission resumes. Thus, highly accurate transmission power control can be performed.
- the present invention is not limited to Embodiments 1 to 7, and can be implemented with various modifications.
- the compressed mode is described as a situation in which signal transmission is not performed for a while, but the present invention is also applicable to a case where signal transmission is not performed for a while other than the compressed mode. It is possible to apply.
- the present invention is not limited to the frame format (frame configuration, number of slots, and the like) in Embodiments 1 to 7 described above. Further, the first to seventh embodiments can be implemented in appropriate combinations.
- the base station apparatus includes: a receiving section that receives transmission power control information transmitted from the communication terminal apparatus side in a slot immediately before restarting signal transmission stopped for a predetermined period, based on the transmission power control information. And a transmission power control unit that controls transmission power.
- transmission power control information generated based on downlink quality can be reflected when transmission is resumed. Therefore, transmission power control can be performed in advance when transmission is restarted, and the time required for the transmission power to converge to the ideal value can be reduced. As a result, the transmission power can be controlled in advance before the transmission is restarted, and compensation can be performed in advance, so that the amount of compensation up to the ideal value can be reduced. As a result, it is possible to quickly improve the signal quality of the user or reduce interference with other users.
- the base station apparatus includes: a transmission unit that transmits a transmission signal including a known signal in a slot immediately before restarting signal transmission stopped for a predetermined period; And a transmission power control unit that controls transmission power based on the transmission power control information.
- a known signal is transmitted in the slot immediately before resuming signal transmission stopped for a predetermined period, and transmission power control information generated based on the quality of the known signal is reflected when transmission is resumed. Can be done. For this reason, transmission power control can be performed in advance when transmission is restarted, and the time until the transmission power converges to the ideal value can be reduced. As a result, transmission power control can be performed in advance before transmission is resumed, and compensation can be performed in advance, so that the amount of compensation up to the ideal value can be reduced. As a result, the signal quality of the user can be quickly improved, or interference with other users can be reduced.
- the base station apparatus of the present invention in the above configuration, employs a configuration in which the predetermined period is a transmission stop period in a compressed mode.
- the transmission power can be quickly converged to the ideal value after transmission is resumed, and The signal quality of a user can be improved, or interference with other users can be reduced.
- the base station apparatus of the present invention in the above configuration, further includes a detection unit that detects whether transmission power control information has been transmitted from the communication terminal apparatus side in the slot immediately before restarting the signal transmission stopped for the predetermined period. It adopts the configuration to do.
- the base station apparatus of the present invention may be configured such that during the period during which the predetermined period is stopped, A configuration including an identification unit that identifies whether to perform the transmission power control based on a fixed transmission power control bit transmitted from the communication terminal device is adopted.
- the base station apparatus controls the present invention by the fixed TPC bit transmitted by the communication terminal apparatus during the period corresponding to the transmission suspension period. It is possible to identify the communication terminal device that is subscribing, and it is possible to perform highly reliable transmission power control on this communication terminal device immediately after restarting transmission. This allows the transmission power value to quickly converge to the ideal value. In this case, since the communication terminal apparatus supporting the control of the present invention controls the transmission power of the base station apparatus immediately after the restart of transmission with high reliability, the communication terminal apparatus also quickly converges the transmission power value to the ideal value. be able to.
- the communication terminal device includes: a receiving unit that receives a signal including a known signal transmitted in a slot immediately before restarting signal transmission stopped for a predetermined period on the base station device side; And a transmission unit that transmits a transmission signal including the transmission power control information.
- transmission power control information generated based on downlink quality can be transmitted in advance on the uplink, and this transmission power control information can be reflected when transmission is resumed. For this reason, transmission power control can be performed in advance when transmission is restarted, and the time until the transmission power converges to the ideal value can be reduced. As a result, the transmission power can be controlled in advance before resuming transmission, and compensation can be performed in advance, so that the amount of compensation up to the ideal value can be reduced. As a result, it is possible to quickly improve the signal quality of a user or reduce interference with other users.
- the communication terminal device of the present invention in the above configuration, employs a configuration in which a ratio of the transmission power control information in the transmission signal is higher than that in a normal data transmission.
- the transmission rate of the transmission power control information increases, and the base station apparatus , Transmission power information can be transmitted more accurately and in a less error-prone state, and as a result, transmission power control in the base station apparatus can be performed reliably.
- the communication terminal device in the above configuration, employs a configuration in which the transmission signal repeatedly includes transmission power control information. According to this configuration, the transmission power control information is transmitted in a state that is strong against errors, and the base station apparatus can accurately receive the transmission power control information.
- the communication terminal device of the present invention in the above configuration, employs a configuration in which the transmission power control information includes step width information. According to this configuration, a larger signal amount (number of bits) than usual can be assigned to the transmission power control information, so that information on the number of control steps in transmission power control can be carried. For this reason, transmission power control can be performed dynamically in the recovery mode from transmission restart, and the transmission power value can be quickly converged to the ideal value.
- a communication terminal device includes: a receiving unit that receives a signal including a common known signal common to all users and a known signal transmitted in a slot immediately before signal transmission is stopped on a communication partner side; A power ratio calculation unit for calculating a transmission power ratio between the known signal and the common known signal; and a common known signal transmitted in a slot immediately before resuming the signal transmission stopped for a predetermined period and the transmission power ratio.
- a control information generating unit that generates transmission power control information based on the quality obtained by using the transmission power of the above, and a transmitting unit that transmits a transmission signal including the transmission power control information. .
- the transmission power control information of the channel whose transmission has been stopped is obtained using the transmission power ratio and the common known signal that is constantly transmitted, and the transmission power control information is transmitted to the base station apparatus side. Even if there is no transmission of a known signal during the transmission suspension period from the base station device side, transmission power control can be performed in advance when transmission is resumed, reducing the time required for the transmission power to converge to the ideal value. can do. As a result, the transmission power can be controlled in advance before the transmission is restarted, and compensation can be performed in advance, so that the amount of compensation up to the ideal value can be reduced. This allows It is possible to quickly increase the signal quality of a user or reduce interference with other users.
- the communication terminal device of the present invention in the above configuration, further comprising a second control information generation unit that generates fixed transmission power control information in a period corresponding to a period in which the base station device stops signal transmission, Adopts a configuration of transmitting a signal including the fixed transmission power control information during a period corresponding to a period during which the signal transmission is stopped.
- the control of the present invention can be performed on the base station apparatus by the fixed TPC bit transmitted by the communication terminal apparatus during the period corresponding to the transmission suspension period. You can be notified that it is supported.
- the communication terminal device of the present invention in the above-described configuration, turns on / off transmission power control using a known signal transmitted in the slot immediately before restarting the signal transmission stopped for the predetermined period according to the state of the downlink signal.
- a configuration that includes a judgment unit that performs OFF is adopted.
- the communication terminal device of the present invention in the above configuration, employs a configuration in which the determination unit performs 0 N / 0 FF of the transmission power control based on a Doppler frequency of a downlink signal.
- the power of the communication terminal device can be effectively used by switching the ONZOFF of the control of the present invention.
- a transmission power control method includes the steps of: generating transmission power control information on the communication terminal device side based on the quality of the known signal in the first signal; and transmitting a second signal including the transmission power control information. Controlling the transmission power based on the transmission power control information on the base station apparatus side.
- transmission power control information generated based on downlink quality can be reflected when transmission is resumed. Therefore, transmission power control can be performed in advance when transmission is restarted, and the time required for the transmission power to converge to the ideal value can be reduced. As a result, the transmission power is W
- the compensation can be performed in advance by performing the control, the amount of compensation up to the ideal value can be reduced. As a result, it is possible to quickly improve the signal quality of a user or reduce interference with other users.
- the transmission power control method of the present invention includes: transmitting a first signal including a known signal in a slot immediately before restarting signal transmission stopped for a predetermined period on the base station device side; and transmitting the first signal on the communication terminal device side. Generating transmission power control information based on the quality of the known signal in the signal, transmitting a second signal including the transmission power control information, and transmitting the second signal on the base station apparatus side based on the transmission power control information. Controlling the transmission power.
- a known signal is transmitted in a slot immediately before restarting signal transmission stopped for a predetermined period, and transmission power control information generated based on the quality of the known signal is reflected when transmission is resumed. Can be done. Therefore, transmission power control can be performed in advance when transmission is resumed, and the time required for the transmission power to converge to the ideal value can be reduced. As a result, the transmission power can be controlled in advance before the transmission is restarted, and the compensation can be performed in advance, so that the amount of compensation up to the ideal value can be reduced. As a result, the signal quality of the user can be quickly improved, or interference with other users can be reduced.
- the transmission power control method includes a step of transmitting a common known signal common to all users on the base station apparatus side and a first signal including the known signal in a slot immediately before the signal transmission is stopped. Determining a transmission power ratio between the common known signal and the known signal on the communication terminal side; and transmitting from the base station apparatus in the slot immediately before resuming the transmission after stopping the transmission power ratio and the signal for a predetermined period. Generating transmission power control information based on the quality determined by using the transmission power of the obtained common known signal, and transmitting a second signal including the transmission power control information; and Controlling the transmission power on the basis of the transmission power.
- transmission power control information of a channel whose transmission has been stopped is obtained using a transmission power ratio and a common known signal that is constantly transmitted, and the transmission power control information is obtained. Since the signal is transmitted to the base station device, even if there is no transmission of a known signal during the transmission stop period from the base station device, transmission power control can be performed in advance when transmission is resumed, and the transmission power is set to the ideal value. Can be reduced. As a result, the transmission power can be controlled in advance before the transmission is restarted, and compensation can be performed in advance, so that the amount of compensation up to the ideal value can be reduced. As a result, it is possible to quickly increase the signal quality of a user or reduce interference with other users.
- the present invention compensates for the difference between the signal quality of the downlink and the desired quality of the downlink as the uplink signal in the slot immediately before the transmission is resumed in the situation where the signal transmission is not performed. Transmit power control information (TPC bit).
- TPC bit power control information
- the present invention can be effectively used in a digital wireless communication system, particularly in a CDMA system.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020017004903A KR20010080245A (ko) | 1999-08-20 | 2000-08-10 | 기지국 장치, 통신 단말 장치 및 송신 전력 제어 방법 |
AU64735/00A AU6473500A (en) | 1999-08-20 | 2000-08-10 | Base station device, communication terminal, and transmission power control method |
EP00951926A EP1119117A1 (en) | 1999-08-20 | 2000-08-10 | Base station device, communication terminal, and transmission power control method |
CA002347372A CA2347372A1 (en) | 1999-08-20 | 2000-08-10 | Base station device, communication terminal, and transmission power control method |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11/234766 | 1999-08-20 | ||
JP23476699 | 1999-08-20 | ||
JP11/329899 | 1999-11-19 | ||
JP32989999A JP2001136123A (ja) | 1999-08-20 | 1999-11-19 | 基地局装置、通信端末装置、及び送信電力制御方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001015343A1 true WO2001015343A1 (fr) | 2001-03-01 |
Family
ID=26531744
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/005352 WO2001015343A1 (fr) | 1999-08-20 | 2000-08-10 | Station de base, terminal de transmission et procede de commande de la puissance de transmission |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1119117A1 (ja) |
JP (1) | JP2001136123A (ja) |
KR (1) | KR20010080245A (ja) |
CN (1) | CN1319285A (ja) |
AU (1) | AU6473500A (ja) |
CA (1) | CA2347372A1 (ja) |
WO (1) | WO2001015343A1 (ja) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003143639A (ja) * | 2001-11-07 | 2003-05-16 | Nec Corp | 移動通信システム、基地局、移動機及びそれらに用いる周波数間hho方法 |
JP4041733B2 (ja) | 2002-12-19 | 2008-01-30 | 株式会社エヌ・ティ・ティ・ドコモ | 送信電力制御方法及び制御装置 |
MXPA06003071A (es) | 2003-09-26 | 2006-05-31 | Interdigital Tech Corp | Determinacion de factores de ganancia para la potencia de transmision inalambrica. |
GB0326365D0 (en) | 2003-11-12 | 2003-12-17 | Koninkl Philips Electronics Nv | A radio communication system,a method of operating a communication system,and a mobile station |
US7808944B2 (en) * | 2003-11-21 | 2010-10-05 | Interdigital Technology Corporation | Wireless communication method and apparatus for controlling the transmission power of downlink and uplink coded composite transport channels based on discontinuous transmission state values |
CN101103555B (zh) * | 2005-01-24 | 2012-04-11 | 富士通株式会社 | 发送功率控制方法及移动终端装置 |
WO2006104208A1 (ja) * | 2005-03-29 | 2006-10-05 | Ntt Docomo, Inc. | 送信電力制御方法及び移動局 |
EP1895683B1 (en) * | 2005-06-17 | 2018-07-18 | NEC Corporation | Communication control method, communication control system and control program thereof |
US8260340B2 (en) * | 2006-02-17 | 2012-09-04 | Alcatel Lucent | Methods of reverse link power control |
US8094554B2 (en) * | 2006-10-26 | 2012-01-10 | Qualcomm Incorporated | Compressed mode operation and power control with discontinuous transmission and/or reception |
CN101359936B (zh) * | 2007-08-02 | 2012-09-05 | 鼎桥通信技术有限公司 | 一种内环功控的方法及装置 |
TWI497933B (zh) | 2007-08-13 | 2015-08-21 | Interdigital Tech Corp | 與間歇流量關聯的無線資源開銷降低方法及裝置 |
JP5168066B2 (ja) | 2008-10-01 | 2013-03-21 | 日本電気株式会社 | 移動通信システム、無線基地局、送信レート割当方法 |
CN102026359B (zh) * | 2010-12-31 | 2014-10-29 | 普联技术有限公司 | 一种自动调节无线发射功率的方法、系统及ap和sta |
JP6747571B2 (ja) | 2017-02-16 | 2020-08-26 | 日本電気株式会社 | 無線アドホックネットワークにおける通信端末、通信方法及び通信プログラム |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH098716A (ja) * | 1995-06-19 | 1997-01-10 | Matsushita Electric Ind Co Ltd | 移動体通信装置 |
JPH09261172A (ja) * | 1996-03-22 | 1997-10-03 | Matsushita Electric Ind Co Ltd | 移動通信装置 |
-
1999
- 1999-11-19 JP JP32989999A patent/JP2001136123A/ja not_active Withdrawn
-
2000
- 2000-08-10 CA CA002347372A patent/CA2347372A1/en not_active Abandoned
- 2000-08-10 WO PCT/JP2000/005352 patent/WO2001015343A1/ja not_active Application Discontinuation
- 2000-08-10 AU AU64735/00A patent/AU6473500A/en not_active Abandoned
- 2000-08-10 CN CN00801621A patent/CN1319285A/zh active Pending
- 2000-08-10 KR KR1020017004903A patent/KR20010080245A/ko not_active Application Discontinuation
- 2000-08-10 EP EP00951926A patent/EP1119117A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH098716A (ja) * | 1995-06-19 | 1997-01-10 | Matsushita Electric Ind Co Ltd | 移動体通信装置 |
JPH09261172A (ja) * | 1996-03-22 | 1997-10-03 | Matsushita Electric Ind Co Ltd | 移動通信装置 |
Also Published As
Publication number | Publication date |
---|---|
AU6473500A (en) | 2001-03-19 |
KR20010080245A (ko) | 2001-08-22 |
JP2001136123A (ja) | 2001-05-18 |
CA2347372A1 (en) | 2001-03-01 |
EP1119117A1 (en) | 2001-07-25 |
CN1319285A (zh) | 2001-10-24 |
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