WO2000013325A1 - Emetteur-recepteur et procede de regulation de sa puissance de transmission - Google Patents
Emetteur-recepteur et procede de regulation de sa puissance de transmission Download PDFInfo
- Publication number
- WO2000013325A1 WO2000013325A1 PCT/JP1999/004628 JP9904628W WO0013325A1 WO 2000013325 A1 WO2000013325 A1 WO 2000013325A1 JP 9904628 W JP9904628 W JP 9904628W WO 0013325 A1 WO0013325 A1 WO 0013325A1
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- WIPO (PCT)
- Prior art keywords
- amplitude
- transmission power
- transmission
- tpc bit
- signal
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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
- H04W52/223—TPC being performed according to specific parameters taking into account previous information or commands predicting future states of the transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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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
-
- 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
- H04W52/283—Power depending on the position of the mobile
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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
- H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
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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
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
-
- 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
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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 transmission / reception apparatus for mobile communication using a CDMA system and a transmission power control method thereof.
- FIG. 1 is a main block diagram showing a schematic configuration of a conventional transmitting / receiving apparatus.
- the frame configuration unit 1 multiplexes the transmission data and the TPC bit.
- Spreading section 2 spread-modulates the multiplexed data, and BPF 3 removes unnecessary signals from the spread-modulated signals.
- the transmission amplifier 4 amplifies the transmission signal from which unnecessary signals have been removed.
- the duplexer 5 controls input / output signals to / from the antenna 6.
- the antenna 6 radiates the amplified transmission signal.
- Antenna 6 receives the transmitted signal.
- Despreading section 7 demodulates the received signal.
- the reception quality detection unit 8 detects the reception quality by calculating the ratio of the signal component to the noise component (SIR) from the result of the despreading performed by the despreading unit 7. I do.
- the TPC bit generation unit 9 receives the detection result of the reception quality detection unit 8 and increases the transmission power if the reception quality is equal to or lower than the desired quality.
- TPC bits that tell the other station to lower the transmit power to reduce interference to the user. For example, if the quality is lower than the desired quality, 1 is set as the TPC bit, and if the quality is higher than the desired quality, 0 is set as the TPC bit.
- the generated TPC bits are sent to frame configuration section 1 and multiplexed together with transmission data.
- the determination unit 10 obtains the received data from the demodulated received signal, and at the same time, extracts the TPC bit generated and transmitted by the partner station, and determines whether the TPC bit is 0 or 1.
- the accumulating unit 11 receives the judgment result of the judging unit 10 and instructs the transmission amplifier 4 to increase or decrease the transmission power according to the result.
- the judgment result when the judgment result is 0, it is judged that the instruction from the partner station is to reduce the transmission power, and the current amplification is reduced by 1 dB.
- the judgment result when the judgment result is 1, the instruction from the partner station is transmitted. It is determined in advance that the power should be increased, and the current amplification amount is increased by 1 dB.
- the conventional transmission / reception apparatus and transmission power control method perform transmission power control based on the TPC bit in the received signal in both the base station and the mobile station transmission / reception apparatus so as to maintain appropriate transmission power. I do.
- the amount of increase / decrease during transmission power control that is, the width of the transmission power to be increased / decreased based on the received 1-bit TPC bit, is set to a predetermined value (see In the example, the soil is 1 dB), so if this constant value is set to a large value, it will not be possible to control properly in situations where the change in amplitude is small (low-speed fading), and stability will be lacking. If the value is set to a small value, there is a problem that the tracking ability in a situation where the amplitude changes greatly (at the time of high-speed fading) is deteriorated.
- a situation in which the amplitude changes greatly is, for example, when the compressed mode is used.
- a pause section such as a compressed mode is provided, a large difference occurs between the control transmission power value and the required transmission power value as a target value during the pause section.
- the TPC bit is one bit, only two values, that is, “increase” or “decrease” can be transmitted and received. Therefore, it is conceivable to increase the amount of information that can be transmitted and received by increasing the allocation to the TPC bits in one slot, and to control not only the increase / decrease of the transmission power but also the amount of increase / decrease.
- the number of bits in one slot is fixed, the number of bits used for TPC bits There is a problem that if the number of transmissions is increased, the transmission efficiency in the night will decrease.
- An object of the present invention is to provide a transmission / reception apparatus that has both tracking performance in high-speed fading and the application of compressed mode and stability in low-speed fading without reducing transmission efficiency, and a transmission power control method therefor. To provide.
- the transmission / reception device and the transmission power control method of the present invention enable the amplitude of the TPC bit to be set separately from other transmission signals.
- the sign of the TPC bit but also the amplitude is parameterized, so that the sign shows the increase and decrease and the amplitude shows the amount of increase and decrease, and the TPC bit consisting of 1 bit is simply a fixed amount of transmission power.
- the increase / decrease control but also the control to increase / decrease by an arbitrary increase / decrease amount is transmitted.
- FIG. 1 is a block diagram showing a schematic configuration of a conventional transmitting / receiving apparatus
- FIG. 2 is a main block diagram showing a schematic configuration of a transmitting / receiving apparatus according to Embodiment 1 of the present invention
- FIG. 3 is a main block diagram showing a schematic configuration of a reception quality detection unit according to Embodiment 1 of the present invention.
- FIG. 4 is a main block diagram showing a schematic configuration of a transmission / reception device in which a limiter according to Embodiment 2 of the present invention is provided between a multiplication unit and a transmission amplifier;
- FIG. 5 is a main block diagram showing a schematic configuration of a transmission / reception apparatus in which a limiter according to Embodiment 2 of the present invention is provided between a reception quality detection unit and a switching unit;
- FIG. 6 is a main block diagram showing a schematic configuration of a transmission / reception apparatus in which a limiter according to Embodiment 2 of the present invention is provided between an accumulation unit and a multiplication unit;
- FIG. 7 is a main block diagram showing a schematic configuration of a transmission / reception apparatus provided with a limiter between a determination unit and an accumulation unit according to Embodiment 2 of the present invention;
- FIG. 8 is a main block diagram showing a schematic configuration of a transmitting / receiving apparatus according to Embodiment 3 of the present invention.
- 9A and 9B are transmission timing diagrams for explaining the compressed mode
- FIG. 1OA and FIG. 1OB show slots for explaining the compressed mode
- FIG. 11 is a diagram showing a variation in line quality for explaining transmission power control according to Embodiment 3 of the present invention.
- FIG. 12 is a diagram showing line quality fluctuation for explaining transmission power control according to Embodiment 3 of the present invention.
- FIG. 13 is a main block diagram showing a schematic configuration of a transmitting / receiving apparatus according to Embodiment 4 of the present invention.
- FIG. 14A is a graph showing the variation of the conventional control transmission power and SIR
- FIG. 14B is a graph showing the variation of the control transmission power and SIR for explaining the transmission power control in the fourth embodiment of the present invention.
- Graph is a graph showing the variation of the control transmission power and SIR for explaining the transmission power control in the fourth embodiment of the present invention.
- FIG. 15 is a main block diagram showing a schematic configuration of a transmitting and receiving apparatus according to Embodiment 5 of the present invention.
- FIG. 16 is a graph showing fluctuations of control transmission power and SIR for explaining transmission power control according to Embodiment 5 of the present invention.
- FIG. 17 is a main block diagram showing a schematic configuration of a transmitting / receiving apparatus according to Embodiment 6 of the present invention.
- FIG. 18 is a graph showing variation of control transmission power and SIR for explaining transmission power control according to Embodiment 6 of the present invention.
- FIG. 19 is a main block diagram showing a schematic configuration of a transmitting and receiving apparatus according to Embodiment 7 of the present invention
- FIG. 20 is a schematic diagram showing an example of a frame format for explaining chip-in-leave. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 2 is a block diagram showing a schematic configuration of the transmitting and receiving apparatus according to Embodiment 1 of the present invention.
- the frame composing section 101 multiplexes the transmission data and the TPC bit.
- the spreading unit 102 spreads and modulates the multiplexed data.
- BPF103 removes the extra signal.
- the transmission amplifier 104 amplifies the transmission signal. This transmission signal passes through the duplexer 105 and is radiated from the antenna 106.
- Antenna 106 receives the transmitted signal.
- Despreading section 107 demodulates the received signal.
- the reception quality detection unit 108 detects the reception quality from the SI scale of the despreading unit 107.
- the configuration of the reception quality detection unit 108 will be described later.
- the TPC bit generation unit 109 generates a TPC bit based on the reception quality, and transmits it to the frame configuration unit 101.
- the determination unit 110 includes a pit determination unit 111 and an amplitude reading unit 112.
- the determination unit 110 obtains the reception data from the demodulated reception signal and outputs it.
- the bit determining section 1 1 1 extracts the TPC bit in the received signal and determines whether the TPC bit is 0 or 1.
- the amplitude reading unit 112 reads the ratio between the amplitude of the signal other than the TPC bit in the received signal and the amplitude of the TPC bit.
- the accumulating unit 113 obtains the sign of the TPC bit of the received signal and the amplitude value ratio from the determining unit 110.
- the code indicates an instruction to increase or decrease the transmission power, and the amplitude value ratio indicates an increase or decrease in the transmission power. By combining these two conditions, the accumulating unit 113 can transmit an arbitrary increase or decrease in transmission power to the transmission amplifier 104.
- the specified amplitude control value can be obtained.
- the amplitude control value output from the accumulator 113 becomes ⁇ 0, and the increase / decrease instruction indicated by the sign of the TPC bit becomes practically meaningless.
- An instruction to maintain the current value is sent to the transmission amplifier 104.
- the multiplication unit 114 transmits the TPC bit in the transmission signal with a variable amplitude based on the reception quality, instead of the amplitude according to the amplitude control value calculated by the accumulation unit 113, which is the same as the other bits. It has a function to instruct 104.
- the reception quality can be added by multiplying the amplitude control value by the correction value calculated from the reception quality detected by reception quality detection section 108 only at the time of TPC bit transmission power control.
- the transmission signals other than the TPC bit are transmitted with the amplitude specified by the communication partner station, and the TPC bit calculates the amplitude specified by the communication partner station based on the ratio of how far the reception quality deviated from the reference. Can be changed and the change can indicate the percentage of deviation from the reference.
- This correction value is proportional to the difference between the reception quality and the desired quality. In other words, if the received quality is far from the desired quality, it is large, and if the difference is small, it approaches 1. Therefore, the TPC bit in the transmission signal can have an amplitude proportional to the transmission power control request increase / decrease amount to the communication partner. The method for calculating the correction value will be described later.
- the switching unit 115 has a function of switching between a value “1” stored in advance and a numerical value representing the reception quality from the reception quality detection unit 108, and sending only one of them to the multiplication unit 114.
- this switching unit 115 By the function of this switching unit 115, other than the TPC bit The correction value is always kept at 1 at the time of bit transmission power control, and the correction value from the reception quality detection unit 108 can be sent to the multiplication unit 114 only at the time of TPC bit transmission power control.
- the amplitude of only the TPC bit in one slot of the transmission signal having a constant amplitude can be made variable, and the determination unit of the communication partner can read the code and the amplitude.
- the amplitude of the TPC bit is small, the number of errors increases. However, this means that the transmission power control amount is small, so that the influence is small.
- FIG. 3 is a main block diagram showing a schematic configuration of the reception quality detection unit according to the first embodiment.
- the SIR of the despread signal that has entered the reception quality detection unit 108 is first measured by the SIR measurement unit 201.
- the subtraction unit 202 subtracts the reference SIR held by the accumulation unit 203 from the measured SIR of the received signal (hereinafter referred to as measured SIR), and sends the result to the positive / negative judgment unit 204.
- the positive / negative determination unit 204 determines whether the subtraction result is positive or negative and transmits the result to the TPC bit generation unit 109.
- the TPC pit generation unit 109 can determine whether to transmit 0 or 1, that is, whether to transmit or increase the transmission power, and generate a bit.
- the divider 205 calculates the ratio of the measured SIR to the reference SIR and sends the ratio to the amplitude converter 206.
- the amplitude conversion unit 206 converts the input division result so that the input and the output become a one-to-one monotone increasing function, and the output is used as an amplitude control correction value via the switching unit 115 via the switching unit 115. Send to 4.
- the ratio of the measured SIR to the reference SIR is measured and calculated, and the difference from the reference can be determined by comparing with the previously stored reference SIR.
- Signal reception quality can be detected.
- the following method can be considered as one embodiment.
- SQRT (Z) is a function that returns the square root of Z
- ABS (Z) is a function that returns the absolute value of Z.
- Y sent to the multiplication unit 114 serves to correct the amplitude control value output from the accumulation unit 113 according to the reception quality only when the transmission power of the TPC bit is controlled.
- the amplitude fluctuations can be kept smaller than the correction that is directly proportional to the error. That is, when the error X is large, the correction value Y can be prevented from becoming excessively large, and thus the load on the transmission amplifier 104 can be reduced.
- the conventional one-bit TPC bit can only transmit binary information of 0 or 1
- the transmission of the TPC bit in one slot By making the amplitude of the variable, the parameter of the amplitude value increases, more information can be sent with the same 1 bit, and not only the transmission power increase / decrease request to the communication partner but also the increase / decrease request Can be transmitted using one TPC bit, so that the tracking performance during high-speed fading and the stability during low-speed phasing can be improved without lowering the data transmission efficiency.
- this method it is possible to send an instruction as to whether to increase or decrease the transmission power according to the sign of the TPC bit consisting of 1 bit in the received signal, and to increase or decrease the transmission power according to the amplitude of the TPC bit. Since it is possible to send an instruction to decrease the transmission power, it is possible to send information on the increase and decrease of the transmission power without lowering the data transmission efficiency. In comparison, transmission power control that can handle both high-speed fading and low-speed fading becomes possible. In addition, by setting the amplitude indicating the amount of increase or decrease to 0, the support of the increase or decrease indicated by the sign of the TPC bit becomes practically meaningless, and the current state of transmission power, which was not possible when only increasing or decreasing a constant value, was performed.
- An instruction to maintain the value can be sent.
- the transmission power control Since it is possible to receive the request, change the transmission power in accordance with the request, and transmit a transmission power control request to the communication partner station calculated from the reception quality, it is possible to maintain good communication quality.
- the transmitting and receiving apparatus has the same configuration as that of the first embodiment, except that a limit is added to prevent an excessive transmission power increase request from being made to the transmission amplifier.
- the locations of the limiters are 1) between the multiplication unit and the transmission amplifier, 2) between the reception quality detection unit and the switching unit, 3) between the accumulation unit and the multiplication unit, 4) between the judgment unit and the accumulation unit, Can be considered.
- each of the cases 1) to 4) will be described with reference to FIGS.
- the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.
- Figure 4 shows the configuration of the transmitter / receiver when the limit is set between 1) the multiplier and the transmission amplifier.
- the amplitude control value of the transmission power transmitted from the multiplier 114 to the transmission amplifier 104 can be limited by the limiter 301. Therefore, if the mobile station is located in the fading valley and the communication quality deteriorates, and as a result an excessive transmission power increase request is made to the transmission amplifier 104, the amplitude control value is limited by the limiter 301. By doing so, quality degradation can be tolerated and excessive transmission power can be prevented.
- Figure 5 shows the configuration of the transmission / reception device when the limit is set between 2) the reception quality detection unit and the switching unit.
- the amplitude control correction value sent from the reception quality detection unit 108 to the multiplication unit 114 via the switching unit 115 can be limited by the limit 401. Therefore, the detection result of the reception quality detection unit 108 is disturbed by noise and interference, and a value that is excessive than an actually required correction value is prevented from being output to the multiplication unit 114. Requests can be avoided.
- Figure 5 shows the configuration of the transmitter / receiver when the limit is set between 3) the accumulator and the multiplier.
- the amplitude control value sent from the accumulator 1 13 to the multiplier 1 1 4 is limited. Evening can be limited at 501. Therefore, it is possible to prevent the amplitude control value output from the accumulator 113 from being output to the multiplier 114 from being excessively larger than the actually required control value due to noise or interference. Can be avoided.
- this 3 since the limit is set by the limiter 501 before correction by the multiplier 114, if the original amplitude control value received is large, control is performed after correction by the multiplier 114. Performing more accurate transmission power control than in 1).
- Figure 7 shows the configuration of the transmitter / receiver when the limit is set between 4) the judgment unit and the accumulation unit.
- the amplitude value sent from the amplitude reading unit 112 to the accumulating unit 113 can be limited by the limit 601. Therefore, it is possible to prevent a value exceeding the actual amplitude value from being output to the multiplication unit 114 due to noise or interference, and to avoid an excessive transmission power increase request.
- the second embodiment it is possible to prevent an excessive load from being applied to the transmission amplifier 104, and to improve device safety.
- the compressed mode is to reduce the spreading factor for continuously transmitted data and increase the power of the part where the spreading factor is changed instead, as shown in FIGS. 9 and 10.
- a mode in which transmission is performed and the transmission time is compressed. Compressed mode is sometimes called Slotted Mode.
- compressed mode other carriers can be monitored in the free time by compressing the transmission time. Therefore, it is possible to monitor information of different carriers during communication without reducing the amount of information to be transmitted. In this case, communication and monitoring of different carriers can be performed by one receiving unit. For example, if the spreading factor for a normal slot 801 as shown in FIG.
- the spreading factor is CZ 2 in the compressed mode
- the compressed slot 80 as shown in FIG. 2 is provided. That is, in the compressed mode, as shown in FIG. 9B, for the frames a and b that are continuously transmitted as shown in FIG. 9A, the first half of the frame a and the second half of the frame b are compressed slots (for example, , The spreading factor is C / 2, and the power is usually twice that of slot 801).
- pause period here, for example, 10 ms
- reception is performed at the frequency f1, and the frequency ⁇ 2 is monitored during the period when transmission is stopped.
- FIG. 8 is a main block diagram showing a schematic configuration of the transmitting and receiving apparatus according to Embodiment 3 of the present invention.
- the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.
- the compressed mode on the transmitting side and the compressed mode on the receiving side are considered asynchronous (independent events).
- a compressed mode control unit (reception side) 702 for recognizing whether or not the apparatus is in a compressed mode, a step width of transmission power control in the compressed mode and When the compressed mode is released, the compressed mode step width controller 703 controls the transmission power using the sign and the amplitude of the transmission power control bit indicating the increase and decrease of the transmission power.
- a compressed mode control unit (transmitting side) 701 for indicating that the mode is the compressed mode.
- the compressed mode control section (receiving side) 7202 controls the transmission power for the compressed mode when in the compressed mode, and controls the transmission power control signal when the compressed mode is released.
- the compressed mode step width controller 703 is controlled so as to perform transmission power control based on the sign and the amplitude.
- the compressed mode control unit transmitting side
- the instruction is sent to the frame composing section 101, the spreading section 102, and the transmitting amplifier 104, respectively.
- the frame composing section 101 performs a frame format for the compression slot 802, and further, for the spreading section 1 ⁇ 2, the spreading factor is half that of the normal slot 801. Specify the spreading code to create compression slot 802. In addition, a command issued to the transmission amplifier 104 prevents transmission during the compressed mode.
- the compressed mode control unit (receiving side) 720 recognizes and determines that it is in the compressed mode, the transmission power control bit cannot be received during that time. This signal is given to the step width controller 703 in the press mode, and special transmission power control is performed during the compressed mode.
- This special transmission power control is, for example, a control that outputs 0 as a transmission power control bit during the compressed mode so that the value before entering the compressed mode is not changed. Control that gives a change predicted from fluctuations in the transmission power, control that gradually reduces the transmission power, etc. can be considered. There is no particular limitation on the special transmission power control in the compressed mode.
- the transmission power control error is much larger when the compression mode is released than in the normal continuous transmission.
- the step of the transmission power control is made variable by the amplitude of the transmission power control bit. Therefore, the transmission power control error can be compensated for immediately after the compression mode is released, interference with other users can be reduced, and the quality of the transmission signal of the user can be ensured.
- a follow-up state of transmission power control for channel fluctuations in the present embodiment will be described using FIG. 11 and FIG.
- the curves (a) in FIGS. 11 and 12 show the fluctuation of the line quality.
- the transmission power control on the transmission side shown in (d) and the reception quality fluctuation on the reception side shown in (e) are obtained.
- This transmission power control method is the same as in Embodiments 1 and 2, and a specific description is omitted. That is, on the transmitting side, the transmission power control step can be made variable by the amplitude of the transmission power control bit, so that it is possible to dynamically perform error compensation for a large transmission power control error after the release of the compressed mode. And quickly converge to the desired quality.
- the transmission power control of the arbitrary increase / decrease amount is performed with the code and amplitude of the 1-bit TPC bit as a parameter, so that transmission in the compressed mode is performed. It is possible to have a follow-up property to reduce a large transmission power control error caused by a failure in power control in a short time, and to quickly respond to a change in line quality.
- the transmitting / receiving apparatus has a configuration similar to that of the third embodiment, except that transmission is performed with a transmission amplitude value larger than an amplitude value calculated by transmission power control immediately before entering a pause period. A period is provided.
- FIG. 13 is a main block diagram showing a schematic configuration of a transmission / reception apparatus according to Embodiment 4 of the present invention.
- FIG. 14 is a view for explaining transmission power control in Embodiment 4 of the present invention.
- 6 is a graph showing fluctuations in transmission power and SIR. The same components as those in the third embodiment are denoted by the same reference numerals, and detailed description is omitted.
- the amplitude setting unit before pause section 1 201 sets the amplitude immediately before the pause section starts. For a certain period before, regardless of the required transmission power, a command is generated that makes the control transmission power much larger than during normal control, and the multiplication unit 1 14 via the switching unit 115 To communicate.
- the pause section pre-amplitude setting section 1221 and the switching section 115 are composed of the compressed mode control section (receiving side) 702 Can easily know the start time of the pause section, and the above control can be performed.
- FIG. 14A is a graph showing the variation of the control transmission power and the measured SIR when the conventional transmission power control is performed with a constant control amount
- FIG. 14B is a graph showing the transmission power control according to the present embodiment
- 7 is a graph showing fluctuations in control transmission power and measured SIR when the above is performed.
- Embodiment 3 aims at eliminating this deterioration in as short a time as possible.
- transmission is performed with a transmission amplitude value larger than the amplitude value calculated by the transmission power control, that is, the amplitude value for approaching the required transmission power value,
- the control transmission power drops significantly below the required transmission power, causing a drop in the SIR and deteriorating the reception quality before the control transmission power follows the required transmission power.
- quality can be maintained as a whole by creating a section in which the measured SIR greatly exceeds the reference SIR in advance.
- a period in which transmission is performed with a transmission amplitude value larger than the amplitude value calculated by the transmission power control immediately before entering the pause period is provided, so that the measurement SIR after the termination of the pause period is determined. It is possible to reduce the influence of reception quality deterioration due to the drop. (Embodiment 5)
- the transmitting / receiving apparatus has a configuration similar to that of the third embodiment, except that a section for transmitting with transmission power exceeding required transmission power is provided immediately after the end of the pause section.
- FIG. 15 is a main block diagram illustrating a schematic configuration of a transmission / reception apparatus according to Embodiment 5 of the present invention.
- FIG. 16 is a diagram illustrating transmission power control according to Embodiment 5 of the present invention.
- 6 is a graph showing fluctuations in transmission power and SIR.
- the same components as those in the third embodiment are denoted by the same reference numerals, and detailed description is omitted.
- the surplus amplitude setting unit 1401 obtains the measured SIR from the despreading unit 107, and the beginning and end of the pause interval from the compressed mode control unit (reception side) 702.
- the TPC bit code is used to perform control to further increase the control transmit power after the control transmit power satisfies the required transmit power for a predetermined period after the pause section.
- a correction value for the amplitude and outputs the sign to the TPC bit generation unit 109 and the correction value to the switching unit 115.
- the TPC bit generation unit 109 generates a TPC bit based on the output of the surplus amplitude setting unit 1401, and transmits it to the frame configuration unit 101.
- FIG. 16 is a graph showing variations in control transmission power and measured SIR when power control according to the present embodiment is performed.
- transmission power control is performed such that the transmission power is further increased even after the control transmission power satisfies the required transmission power for a predetermined period after the end of the idle period.
- the amount of increase or decrease in transmission power at that time is variable.
- the transmission power is further excessively corrected even after the measured SIR satisfies the reference SIR. Even when the control transmission power falls short of the required transmission power at the time of resumption of transmission and reception, the SIR drops and the reception quality deteriorates before the control transmission power follows the required transmission power. As described above, according to the present embodiment, after the required transmission power is satisfied after the end of the idle period, the transmission power is further excessively corrected. This can reduce the influence of the degradation of the reception quality due to the drop in the measurement SIR.
- the transmitting / receiving apparatus has a configuration similar to that of the third embodiment, except that an offset value is added to the transmission power value immediately after the end of the idle period.
- FIG. 17 is a main block diagram showing a schematic configuration of a transmission / reception apparatus according to Embodiment 6 of the present invention.
- FIG. 18 is a view for explaining transmission power control in Embodiment 6 of the present invention. 6 is a graph showing fluctuations in control transmission power and SIR. Note that the same components as those of the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
- the required transmission power prediction unit 1601 obtains the start and end timings of the pause interval from the compressed mode control unit (reception side) 720, and if there is a pause interval, after the end of the pause interval.
- the receiving side predicts the transmission power required to satisfy the reference SIR and outputs it to the offset setting section 1602.
- Offset setting section 1602 sets an offset value of transmission power based on the prediction result, and outputs the value to accumulating section 113.
- FIG. 18 is a graph showing variations in control transmission power and measured SIR when power control according to the present embodiment is performed.
- the first control transmission power value at the time of resuming transmission and reception is calculated as the control transmission power value immediately before the start of the suspension period.
- the offset value is added. That is, the offset value is calculated such that the required transmission power value at the time of resuming transmission / reception after the end of the pause period is predicted, and the control transmission power value at the time of resumption matches the required transmission power value. Therefore, the difference between the required transmission power value and the control transmission power value at the time of resuming transmission / reception can be minimized, and the period during which the measured SIR is falling can be shortened.
- the initial control transmission power value at the time of resuming transmission / reception is a value obtained by adding the calculated offset value to the control transmission power value immediately before the start of the pause interval.
- the method of estimating the required transmission power immediately after the end of the idle period is arbitrary, but as an example, a method based on the number of TPC bit codes before the idle period or the sum of increase / decrease Can be considered.
- the transmitting / receiving apparatus has a configuration similar to that of the third embodiment, but performs chip interleaving.
- FIG. 19 is a main block diagram showing a schematic configuration of a transmission / reception apparatus according to Embodiment 7 of the present invention.
- FIG. 20 is a schematic diagram showing an example of a frame format for explaining chip-in-leave FIG.
- the same components as those of the third embodiment are denoted by the same reference numerals, and the detailed description is omitted.
- the chip-in / leave section 1801 transmits / receives each chip of the spread transmission signal, and the chip / din / leave section 1802 transmits the received signal.
- the reverse of the order of the chip interleaving is performed.
- FIG. Figure 20 shows 16 symbols for 8 symbols per slot An example in the case of double diffusion is shown.
- symbol 0 is spread to 16 chips. At this time, 16 chips are not placed in a continuous position, but are placed every 8 chips. As a result, the chips for one symbol are distributed to multiple slots, and the chips for one symbol are distributed to slots with good signal quality and slots with bad signal quality. Each symbol can be maintained at a certain level of quality. Therefore, even if there is a difference between the required transmission power after the end of the idle period and the control transmission power, and a slot with poor signal quality occurs, the degradation of the symbol in that slot is determined by the symbol of the slot with good signal quality. As a result, the signal quality can be maintained.
- the present embodiment by performing transmission power control of an arbitrary increase / decrease amount, a large transmission power control error caused by the failure of transmission power control in the compressed mode can be reduced in a short time.
- the reception quality of each symbol is averaged by performing the chip-in-one-leave, deterioration of the reception quality after the pause period can be reduced.
- the specific method of the chip-in-leave and the chip-in-leave is arbitrary, and is not limited to the numerical values listed here.
- Embodiments 1 to 7 can be implemented with various modifications.
- Embodiments 1 to 7 can be implemented in appropriate combinations.
- Embodiments 4 to 7 can be applied as long as the transmission power control is performed in the compressed mode, and is independent of the transmission power control of the arbitrary increase / decrease amount described in Embodiments 1 to 3. It is also possible to apply.
- the present invention is applicable to a system using an FBI (Feed Back Information) bit for the purpose of reducing interference by transmission power control at the time of handover.
- FBI Field Back Information
- the sign and the amplitude of the TPC bit indicate the increase and decrease of the transmission power, so that the data transmission efficiency is not reduced during high-speed fading and compressed mode transmission. This can improve the followability at the time of driving and the stability at the time of low-speed fading.
- the present invention can be applied to a communication terminal device such as a mobile station and a base station device in a digital wireless communication system.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Transmitters (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002306626A CA2306626A1 (en) | 1998-08-28 | 1999-08-27 | Transmission/reception apparatus and transmit power control method |
KR1020007004572A KR20010031530A (ko) | 1998-08-28 | 1999-08-27 | 송수신 장치 및 그 송신 전력 제어 방법 |
US09/529,871 US6603980B1 (en) | 1998-08-28 | 1999-08-27 | Transmitter-receiver, and method for controlling transmission power of the same |
AU54442/99A AU5444299A (en) | 1998-08-28 | 1999-08-27 | Transmitter-receiver, and method for controlling transmission power of the same |
EP99940514A EP1035658A1 (en) | 1998-08-28 | 1999-08-27 | Transmitter-receiver, and method for controlling transmission power of the same |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/243743 | 1998-08-28 | ||
JP24374398 | 1998-08-28 | ||
JP11/65684 | 1999-03-11 | ||
JP6568499 | 1999-03-11 | ||
JP17892699A JP3471662B2 (ja) | 1998-08-28 | 1999-06-24 | 送受信装置及びその送信電力制御方法 |
JP11/178926 | 1999-06-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000013325A1 true WO2000013325A1 (fr) | 2000-03-09 |
Family
ID=27298868
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/004628 WO2000013325A1 (fr) | 1998-08-28 | 1999-08-27 | Emetteur-recepteur et procede de regulation de sa puissance de transmission |
Country Status (8)
Country | Link |
---|---|
US (1) | US6603980B1 (ja) |
EP (1) | EP1035658A1 (ja) |
JP (1) | JP3471662B2 (ja) |
KR (1) | KR20010031530A (ja) |
CN (1) | CN1129235C (ja) |
AU (1) | AU5444299A (ja) |
CA (1) | CA2306626A1 (ja) |
WO (1) | WO2000013325A1 (ja) |
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- 1999-06-24 JP JP17892699A patent/JP3471662B2/ja not_active Expired - Fee Related
- 1999-08-27 US US09/529,871 patent/US6603980B1/en not_active Expired - Lifetime
- 1999-08-27 KR KR1020007004572A patent/KR20010031530A/ko active IP Right Grant
- 1999-08-27 CA CA002306626A patent/CA2306626A1/en not_active Abandoned
- 1999-08-27 WO PCT/JP1999/004628 patent/WO2000013325A1/ja not_active Application Discontinuation
- 1999-08-27 CN CN99801427A patent/CN1129235C/zh not_active Expired - Fee Related
- 1999-08-27 EP EP99940514A patent/EP1035658A1/en not_active Withdrawn
- 1999-08-27 AU AU54442/99A patent/AU5444299A/en not_active Abandoned
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EP1217861A1 (en) * | 2000-08-02 | 2002-06-26 | Matsushita Electric Industrial Co., Ltd. | Communication terminal, base station device, and radio communication method |
EP1217861A4 (en) * | 2000-08-02 | 2004-04-21 | Matsushita Electric Ind Co Ltd | NETWORK TERMINAL, BASE STATION DEVICE, AND RADIO COMMUNICATION METHOD |
US6799053B2 (en) | 2000-08-02 | 2004-09-28 | Matsushita Electric Industrial Co., Ltd. | Communication terminal apparatus |
US7206587B2 (en) | 2000-08-02 | 2007-04-17 | Matsushita Electric Industrial Co., Ltd. | Communication terminal apparatus, base station apparatus, and radio communication method |
EP1976141A1 (en) * | 2000-08-02 | 2008-10-01 | Matsushita Electric Industrial Co., Ltd. | Communication terminal apparatus, base station apparatus, and radio communication method |
Also Published As
Publication number | Publication date |
---|---|
KR20010031530A (ko) | 2001-04-16 |
CN1275266A (zh) | 2000-11-29 |
JP3471662B2 (ja) | 2003-12-02 |
EP1035658A1 (en) | 2000-09-13 |
US6603980B1 (en) | 2003-08-05 |
AU5444299A (en) | 2000-03-21 |
CN1129235C (zh) | 2003-11-26 |
JP2000324048A (ja) | 2000-11-24 |
CA2306626A1 (en) | 2000-03-09 |
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