WO2002058278A1 - Procede et dispositif de controle de la puissance en boucle externe - Google Patents
Procede et dispositif de controle de la puissance en boucle externe Download PDFInfo
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- WO2002058278A1 WO2002058278A1 PCT/JP2001/000267 JP0100267W WO02058278A1 WO 2002058278 A1 WO2002058278 A1 WO 2002058278A1 JP 0100267 W JP0100267 W JP 0100267W WO 02058278 A1 WO02058278 A1 WO 02058278A1
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- error rate
- interference power
- power ratio
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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
- H04W52/06—TPC algorithms
- H04W52/12—Outer and inner loops
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/20—TPC being performed according to specific parameters using error rate
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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
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/362—Aspects of the step size
Definitions
- the present invention relates to an apparatus and method for controlling a loop in a CDMA mobile communication.
- each channel In the CDMA mobile communication, a plurality of channels share one frequency band. Each channel is distinguished by a spreading code added to it. Therefore, each channel becomes interference noise with respect to the other channels. Therefore, the interference noise power changes depending on the number of users who are simultaneously communicating.
- the receiver measures the signal-to-interference power ratio (SIR) and compares the measured value with the reference SIR. Closed loop transmission power control (TPC) is performed to control the SIR on the side closer to the reference SIR.
- SIR signal-to-interference power ratio
- TPC Closed loop transmission power control
- the SIR required to obtain the desired quality changes due to changes in the moving speed during communication and changes in the propagation environment due to movement.
- block errors are observed, and when the observed value is worse than the desired BLE R (target block error rate), the reference SIR is increased, and when it is good, the reference SIR is decreased.
- Adaptive control of the reference SIR in this way is called "out-of-box control.”
- [2] is a method for detecting whether each block is wrong or wrong, and increasing the reference SIR if an error is detected, and decreasing the reference SIR if no error is detected.
- T observation interval of block error
- round means rounding.
- Table 1 shows each of these methods.
- the reference SIR update interval is fixed and the update interval is long.
- the update interval and the increase and decrease of the reference SIR are values determined empirically, and no rationale is given.
- the observation interval T is determined. If an error occurs, the reference SIR can be updated immediately, but if no error occurs, the set observation interval cannot be updated. Therefore, when BLER is good, the update interval becomes relatively long.
- An object of the present invention is to provide an outer loop control device and a method that can reduce the amount of interference with other terminals more quickly and accurately.
- An outer loop power control apparatus is an outer loop power control apparatus for varying a reference signal to interference power ratio, which is a reference for performing transmission power control according to a communication environment, comprising the steps of: Signal to interference power ratio measurement Means, error rate measurement means for measuring the error rate of received data, error rate observation section or number of data blocks to be monitored for error rate, unit increase of reference signal to interference power ratio, reference signal to interference power ratio
- the reference signal-to-interference power ratio variable is set so that the unit reduction of and the target signal error rate are set so as to satisfy a predetermined relational expression, and the reference signal-to-interference power ratio is changed based on the measured error rate.
- the data loop power control method is directed to a data loop power control method for varying a reference signal-to-interference power ratio serving as a reference for performing transmission power control depending on a communication environment.
- Signal-to-interference power ratio measurement step for measuring power ratio error rate measurement step for measuring received data error rate, error rate observation section or number of data blocks to be monitored for error rate, reference signal to interference power ratio
- the unit increase of the unit, the unit decrease of the reference signal to interference power ratio, and the target signal error rate are set so as to satisfy a predetermined relational expression, and the reference signal to interference power ratio is set based on the measured error rate.
- a command generation step for generating a signal.
- the unit variation of the reference signal to interference power ratio can be flexibly set based on a predetermined relational expression, it is possible to perform finer transmission power control. Therefore, the fine transmission power control can appropriately prevent the data error rate from deteriorating, so that it is possible to maintain high communication quality.
- the unit variation is set appropriately.
- the change in the reference signal-to-interference power ratio can be quickly converged to a steady state, and the transmission power control is not properly performed for a long time, so that it is given to other terminals.
- the adverse effect of transmitted radio waves as interference power can be suppressed.
- FIG. 1 is a block diagram of a transmission power control system according to the first embodiment of the present invention.
- FIG. 2 is a diagram (part 1) for explaining a block configuration of a determination unit for T, Sinc, and Sdec.
- FIG. 3 is a diagram (part 2) for explaining the block configuration of the determination unit for T, Sinc, and Sdec.
- FIG. 4 is a flowchart illustrating the flow of the process according to the first embodiment.
- FIG. 5 is a diagram showing an example of how the reference SIR is increased or decreased by outer loop control.
- FIG. 6 is a diagram illustrating a second embodiment of the present invention.
- FIG. 7 is a flowchart illustrating a processing flow according to the second embodiment of the present invention.
- FIG. 8 is a block diagram of the second embodiment.
- FIG. 9 is a diagram illustrating a third embodiment of the present invention.
- FIG. 10 is a block configuration diagram of the device of the third embodiment.
- FIG. 11 is a block diagram illustrating a fourth embodiment of the present invention.
- FIG. 12 is a block diagram of a fifth embodiment of the present invention.
- FIG. 13 is a view (No. 1) for explaining the sixth embodiment of the present invention.
- FIG. 14 is a diagram (part 2) for explaining the sixth embodiment of the present invention.
- FIG. 15 is a diagram (part 3) for explaining the sixth embodiment of the present invention.
- FIG. 16 is a diagram (part 4) for explaining the sixth embodiment of the present invention.
- FIG. 17 is a diagram (part 1) for explaining the seventh embodiment of the present invention.
- FIG. 18 is a diagram (part 2) for explaining the seventh embodiment of the present invention.
- FIG. 19 is a diagram (No. 1) for explaining the eighth embodiment of the present invention.
- FIG. 20 is a diagram (part 2) for explaining the eighth embodiment of the present invention.
- FIG. 21 is a diagram showing a ninth embodiment of the present invention.
- FIG. 22 is a diagram showing a problem of a method of updating a reference SIR in an initial state in a one loop control.
- FIG. 23 is a diagram schematically showing how the reference SIR of the outer loop control according to the tenth embodiment of the present invention changes.
- FIG. 24 is a diagram (part 1) for explaining the tenth embodiment of the present invention.
- FIG. 25 is a diagram (part 2) for explaining the tenth embodiment of the present invention.
- FIG. 26 is a diagram (part 1) for explaining the eleventh embodiment of the present invention.
- FIG. 27 is a diagram (part 2) illustrating the eleventh embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
- S i nc and S d e c are theoretically calculated, and the observation intervals, S i n c, and S d e c are set so as to satisfy the conditions.
- the observation interval, S i nc, and S dec of the block error may be determined so as to satisfy a certain condition, so that it is possible to have a degree of freedom in setting each parameter. Even if there are restrictions on hardware design, it is possible to design according to them.
- the following control is performed.
- the block error rate is BLER communication
- the probability that an error will occur in the observation section is calculated by subtracting the above equation from 1 to obtain 1 (1- ⁇ LER) ⁇
- the reference SIR is increased by S inc when an error occurs, and the reference SIR is decreased by S dec when no error occurs even after observing the block.
- the reference SIR increases by S inc at the probability 1_ (1—BLER), and the reference SIR decreases by S dec with the probability (1—BLER) ⁇ .
- FIG. 1 is a block diagram of a transmission power control system according to the first embodiment of the present invention.
- the mobile station 10 receives the signal from the base station 11 and demodulates it with the demodulator 12.
- the SIR measurement section 13 measures the SIR of the received signal using the pilot section of the signal output from the demodulator 12.
- the comparator 14 compares the measured SIR value with the reference SIR, and issues a command requesting the base station to reduce the transmission power if the measured SIR value is larger. I will raise Create and output a command that requests this.
- the decoder 15 decodes the signal output from the demodulator 12.
- the CRC detector 16 detects the CRC of the decoded result.
- the reference SIR controller 17 increases or decreases the reference SIR, which is the reference for the power control of the one loop, in accordance with the algorithm shown in FIG. T, Sine, and Sdec are set in the reference SIR controller 17 so as to satisfy Equation (1).
- the smaller T is, the better the followability to the change of BLER is, and the smaller T is preferable.
- S i n c increases and S d e c decreases. If S i nc and S d e c are too large, the fluctuation of the target S I R (reference S I R) becomes large, which is not preferable in terms of characteristics and interference with others.
- the optimal range of T, Sine, and S dec is determined. Within that range, two of the three parameters are selected first, and the remaining one is What is necessary is just to determine so that the formula may be satisfied.
- the computer calculates the actual average value of BLER and reference SIR for various combinations of T, S inc, and S dec, and calculates T, S inc , S dec is determined in advance. For the parameter values found, T, Sine, and Sdec are tabulated for two of the three levels.
- the allowable T, Sine, and S dec ranges are tapered, two parameters are selected from them, and the remaining parameters are calculated by the DSP. Adopt it if it is within the allowable range. If the operation result is out of the allowable range, the operation is performed in another combination, and the operation is repeated until the operation result is in the allowable range. The calculation result thus obtained is transmitted to the reference SIR control unit.
- the above equation for T, Sine and Sdec corresponding to the target BLER is satisfied. Calculate the value to be added, make it a table, and write it to ROM.
- the DSP accesses the ROM in which the combination of the target BLER and T, S inc. S dec is written, reads T, S inc, S dec to be set, and The read parameters are transmitted to the reference SIR controller.
- the reference SIR control command determination unit 20 of the reference SIR control unit 17 is provided with a storage register for temporarily storing T, Sine, and Sdec, and a counter for counting the number of observation blocks. Further, the reference SIR control command determination unit 20 communicates with the DSP 18 and obtains optimal T, Sine, and Sdec.
- the DSP 18 refers to the conversion table 19 storing the optimal T, Sine, and Sdec pairs, extracts the preferred T, Sine, and Sdec pairs from the BLER value, and generates a reference SIR control command. It is stored in the storage register of the decision unit 20.
- the observation block counter counts the number of blocks received, and determines whether or not an error is detected by the CRC detector 16 during T blocks.
- S inc is input from the storage register to the reference SIR increase / decrease control unit 21 to increase the reference SIR and send it to the comparator 14. If no error is detected during the T block, S dec is input from the storage register to the reference SIR increase / decrease control unit 21, the reference SIR is reduced, and then input to the comparator 14.
- the comparator 14 compares the SIR measurement value with the reference SIR, and A command is generated and control information is transmitted to the base station 11.
- the mobile terminal has the configuration shown in FIG. 1, but it may be provided on the base station side.
- FIGS. 2 and 3 are diagrams illustrating a block configuration of a determination unit for T, Sine, and Sdec.
- 03 is to pass the target BLER to the conversion table as an index to obtain the optimal 1 ⁇ S i nc and S d e c.
- the conversion table searches for T, Sinc, and Sdec using the target BLER as a key, and passes it to the DSP. Then, the DSP notifies the reference SIR control unit together with the thus obtained T, Sine, Sdec and the target BLER.
- the DSP obtains two of T, Sine, and S dec from the conversion table using the target BLER, and substitutes the remaining one into the above equation or as described later.
- the calculation is performed using the equation of the embodiment, and all of T, S inc, and S dec are obtained, and are passed to the reference SIR control section together with the target BLER.
- FIG. 4 is a flowchart illustrating the flow of the process according to the first embodiment.
- step S1 the number of observation blocks is reset.
- step S2 CRC detection is performed. If it is determined in step S3 that an error has occurred as a result of the CRC detection, in step S7, the reference SIR is increased by S inc, and the process returns to step S1.
- step S3 the process proceeds to step S4
- step S5 the number of observation blocks is incremented, and the process proceeds to step S5.
- step S5 it is determined whether or not the number of observation blocks is equal to or greater than the observation section. If the determination is NO, the process returns to step S2. If the determination in step S5 is YE S, proceed to step S6, reduce the reference SIR by S dec, and Return to S1.
- FIG. 5 is a diagram showing an example of how the reference SIR is increased or decreased by outer loop control.
- the reference SIR when an error occurs in the reference SIR, the reference SIR is increased by S inc and when no error occurs during the observation section, , Decrease the reference SIR by S dec. By performing such processing, the reference SIR changes so as to maintain an optimal value while repeating up and down movement.
- FIG. 6 is a diagram illustrating a second embodiment of the present invention.
- the reference SIR is set to S. Decrements are made, and if an error occurs in any of the data within the observation section, the reference SIR is increased by S inc when the error occurs. For simplicity, an example in which two data are multiplexed is shown.
- the target block error rate of the first data is B LER 1 and the target block error rate of the second data is B LER 2.
- the observation section is defined as a T block, and when the T block is observed, one error does not occur in all data. The probability of not occurring is
- an error occurs in any of the data.
- the reference SIR is increased by S inc, and if no error occurs from any data even when the T block is observed, the reference S 11 is reduced by 3 (16 c.
- the probability 1— ⁇ ( 1 one BLER 1) X (1-BLER 2) ⁇ reference SI in ⁇ increases S inc
- probability ⁇ (1 one BLER 1) X (1- BLER 2 ) ⁇ reference SIR by ⁇ is S de. reduced.
- FIG. 7 is a flowchart illustrating a processing flow according to the second embodiment of the present invention.
- step S10 the number of observation blocks of the counter is reset.
- step S11 CRC detection is performed.
- step S12 it is determined whether or not the CRC of all data has an error. If there is an error, the process proceeds to step S17, the reference SIR is increased by Sinc, and the process returns to step S10. If it is determined in step S12 that there is no error in any of the data, the process proceeds to step S13, the number of observation blocks is incremented in step S13, and the number of observation blocks is incremented in step S14. It is determined whether or not the number of blocks is equal to or longer than the observation section T. If the determination in step S14 is NO, the process returns to step S11. If the determination in step S14 is YES, the process proceeds to step S15, the reference SIR is reduced by Sdec, and the process returns to step S10.
- FIG. 8 is a block diagram of the second embodiment.
- the processing may be performed in a time-division manner using one decoder and a CRC detector.
- the signal transmitted from the base station 11 is decoded by the demodulator 12 of the mobile station 10. And divided into multiple channels. Each channel is input to a decoder 15 provided and decoded, and then an error is detected in a CRC detector 16 provided for each channel. Then, the error detection result is input to the reference SIR controller 17.
- the reference SIR control command determination unit 20 acquires the values of T, Sine, and Sdec using the DSP 18 and the conversion table 19 and stores them in the storage register. Then, the reference SIR is increased or decreased by the reference SIR increase / decrease control unit according to the above-described flowchart (the counting of the number of observation blocks is performed by the counter), and the obtained reference SIR is input to the comparator 14.
- the comparator 14 compares the SIR measurement value of the SIR measurement unit 13 with the reference SIR, generates and sends a TPC command.
- FIG. 9 is a diagram illustrating a third embodiment of the present invention.
- the first data contains one block per unit time
- the second data contains two blocks per unit time
- data 1 and data 2-1 and 2_2 are multiplexed in a frame of one physical channel. After adding CRC bits, each data is encoded and configured into a physical frame.
- a physical frame consists of encoded data 1, data 2 and a pit signal.
- the target block error rate for the first data is BLER1
- the target block error rate for the second data is BLER2.
- the probability that no error will occur in all data is (1—BLER 1) X (1-BLER2) 2 per unit time. Therefore, when the observation interval is T time, one error is detected in all data when T time is observed. The probability that no
- the reference SIR when an error occurs in any of the data, the reference SIR is increased by S inc, and when no error occurs from any of the data even when the section of length ⁇ is observed. Reduces the reference SIR by S dec. At this time, the reference SIR increases by S inc at the probability 1 — ⁇ (1—BLER 1) X (1—BLER 2) 2 ⁇ ⁇ , and the probability ⁇ (1—BLER 1) X (1—BLER2) 2 ⁇ The standard SIR decreases by S dec.
- FIG. 10 is a block configuration diagram of the device of the third embodiment.
- FIG. 10 The configuration of FIG. 10 is substantially the same as the block diagram of the second embodiment, and thus, duplicate description will be omitted.
- the counter that counts the observation section counts the number of frames.
- the conditional expression to be satisfied by the control parameters changes, 1/00267
- T, Sine, and Sdec stored in the table are different from those in the second embodiment.
- FIG. 11 is a block diagram illustrating a fourth embodiment of the present invention.
- the observation interval T the reference SIR increase when increasing the reference SIR during the reference SIR update control S inc
- the reference SIR When the reference SIR is reduced during the update control, the amount of decrease S dec of the reference SIR is set independently for each data, the block error for each data is monitored independently, and each data is shown in Fig. 4. Execute the control algorithm.
- the probability of no error per block is (l ⁇ BLER i), the probability that no error will occur in all T i blocks is
- the probability that an error will occur in the observation section is calculated by subtracting the above equation from 1 and 1- (1 -B LER i) Ti
- the observation interval T i of each data, the increase S i nc of the reference SIR, or the decrease S d e c of the reference SIR are set so that this formula holds.
- the new standard SIR the old standard SIR + ⁇ ; S ine; - ⁇ k S dec k It is calculated according to the following equation.
- the reference SIR control command determination units are prepared by the number of data channels.
- the reference SIR control command determination unit transmits to the reference SIR increase / decrease control unit a command specifying the increase / decrease of the reference SIR when the power at which an error is detected by the CRC and the observation section expires.
- the reference SIR increase / decrease control unit updates the reference SIR according to the command specified by the reference SIR control command determination unit of each data channel using the above-described reference SIR update equation, and sends the updated reference SIR to the comparator. introduce.
- FIG. 12 is a block diagram of a fifth embodiment of the present invention.
- the number of each data is i
- the number of blocks included in a unit time is N i
- the observation section is T i
- the increase of the reference SIR is S inci
- the decrease is S deci.
- the probability that no error per block occurs is (1-BLER i)
- the probability that no error occurs in the observation section is (1-BLER i) NixTi
- the probability that an error will occur in the observation section is calculated by subtracting the above equation from 1 and 1— (1 -BLER i) Ni XTi
- the observation section T i of each data, the increase S i n c of the reference S I R, or the decrease S d e c i of the reference S I R are set so that this formula holds. Then, the reference SIR value is updated using the reference SIR update formula as described in the fourth embodiment.
- the configuration of the device of the fifth embodiment is almost the same as that of the fourth embodiment. Since the number of blocks included in each frame is different, the counter that counts the observation section is based on the number of frames. Further, since the conditional expressions to be satisfied by the control parameters change, T, Sinc, and Sdec stored in the conversion table are different from those in the fourth embodiment.
- FIG. 13 to FIG. 16 are diagrams illustrating a sixth embodiment of the present invention.
- blocks may not be transmitted and received continuously, but may be transmitted and received at irregular intervals as shown in FIG. In such a case, even if the observation section T is constant, the number of blocks transmitted and received between the blocks varies.
- the probability that an error will occur within the observation interval T and the probability that no error will occur will depend on the observation interval.
- the conditions to be satisfied by S i nc and S d e c change depending on the number of blocks received in the observation section.
- n c or S d e c Use 1 n c or S d e c to calculate the remaining one parameter in D SP.
- TFCI Transport Format Combination Indicator
- FIG. 13 is a flowchart of the process of the sixth embodiment.
- step S20 the number of reception blocks and the number of observation blocks are reset.
- step S21 TFCI determination is performed, and in step S22, the presence or absence of data is determined. If there is no data, go to step S28. If there is data, in step S23, the number of received blocks is incremented. In step S24, the data is decoded.
- step S26 If it is determined in step S26 that an error is included as a result of the CRC detection, in step S27, the reference SIR is increased by S inc and the process returns to step S20. If it is determined in step S26 that there is no error, the process proceeds to step S28, and the number of observation frames is incremented. Then, in step S29, it is determined whether or not the number of observation frames is equal to or longer than the observation section. If the determination is NO, the process returns to step S21. If the determination in step S29 is YES, in step S30, S dec is obtained by a method such as calculation, and in step S31, the reference SIR is reduced by S dec. Then, the processing returns to step S20. repeat.
- FIG. 14 is a diagram illustrating the concept of an example of processing for obtaining S i nc and S d e c from the target BLER.
- the DSP receives one of S inc and S dec by passing the target BLER to the conversion table. Then, from the number of received blocks and S i nc or S d e c, the remaining one is calculated using the above equation, and the target BLER, S i n e, and S d e c are passed to the reference SIR control section.
- FIG. 15 is a diagram illustrating an example of a block configuration according to the sixth embodiment.
- a TFC I determination unit and a reception block number counter are provided, and an observation frame number counter is provided instead of an observation block number counter.
- the TFC I determination unit analyzes the TFC I, and if it is determined that data is to be transmitted, decodes the received data and performs CRC detection. As a result, when an error is detected, the reference SIR is increased by the outer loop control.
- the number of reception blocks is incremented. Also, the number of observation frames is incremented regardless of the presence or absence of data.
- the number of received blocks is transmitted from the reference SIR control unit to the DSP, and the DSP calculates the number of reception blocks and S inc force, and S dec, and the reference SIR control unit
- the reference SIR is reduced by the outer loop control. If the number of observation frames is less than the observation section, the data of the next frame is processed.
- FIG. 17 and FIG. 18 are diagrams illustrating a seventh embodiment of the present invention.
- the reference SIR update control The condition to be satisfied by the increase amount S i 1 c at the time and the decrease amount S dec at the time of the reference SIR update control is as follows.
- FIG. 17 is a flowchart illustrating a process according to the seventh embodiment.
- step S40 the number of reception blocks of each data channel is reset, and the number of observation frames is reset.
- step S41 TFCI determination is performed, and in step S42, the presence or absence of data of each data channel is determined. If it is determined that there is no data, the process proceeds to step S48. If it is determined that there is data, the number of reception blocks is incremented in step S43, the data is decoded in step S44, and CRC detection is performed in step S45. Then, in step S46, it is determined whether or not the CRC of all data channels contains an error. When there is even one error In step S47, the reference SIR is increased by S inc and the process returns to step S40. If it is determined in step S46 that all data channels are not erroneous, the process proceeds to step S48.
- step S48 the number of observation frames is incremented.
- step S49 it is determined whether the number of observation frames is equal to or longer than the observation section. If the determination in step S49 is NO, the process returns to step S41. If the determination in step S49 is YES, the process proceeds to step S50 to calculate Sdec, and in step S51, the reference SIR is reduced by Sdec.
- FIG. 18 is a block diagram of the seventh embodiment.
- FIG. 18 the decoder and the CRC detector are each received as many as the number of data channels.
- the control parameters are common between data channels, there is one reference SIR control command determination unit.
- the number of reception blocks differs for each data channel, a reception block number counter for the number of data channels is required.
- FIG. 19 and FIG. 20 are views for explaining the eighth embodiment of the present invention.
- the observation interval T and the reference SIR update control are performed for each data.
- the increase amount S inc at the time and the decrease amount S dec at the time of the reference SIR update control can be set independently.
- the observation interval of data i is T i
- the number of blocks of data i received in observation interval T i is B i
- the increase in reference SIR update control is S inc
- the decrease in reference SIR update control is S deci.
- the amount of increase S inci when the reference SIR is increased is set in advance for each data before starting communication, and if an error occurs before the set observation interval T i, the reference SIR is increased by S inei Let it. If no error occurs up to the set observation section T i, S d e c; is calculated according to the number of blocks B i received in the observation section, and the reference S I R is reduced by the S d e c;.
- FIG. 19 is a flowchart showing the processing of the eighth embodiment.
- step S60 the number of reception blocks of each data channel is reset, and the number of observation frames is reset.
- step S61 TFC I determination is performed, and in step S62, the presence or absence of data of each data channel is determined. If it is determined that there is no data, the process proceeds to step S69. If it is determined that there is data, the number of received blocks is incremented in step S63, the data is decoded in step S64, and the CRC is detected in step S65. Then, in step S66, it is determined whether or not an error has occurred as a result of the CRC detection. If an error has occurred, the process proceeds to step S67, the reference SIR is increased by Sinc, and in step S68, the number of reception blocks and the number of observation frames are reset, and the process returns to step S61.
- step S69 the number of observation frames is incremented.
- step S70 the number of observation frames of each data channel is changed to the observation interval. Judge whether it is above or not. If the determination in step S70 is N ⁇ , the process returns to step S61. If the determination in step S70 is YES, in step S71, S de c is calculated, and in step S72, the reference SIR is reduced by Sdec. Then, in step S73, the number of reception blocks and the number of observation frames are reset, and the process returns to step S61.
- FIG. 20 is a block diagram of the eighth embodiment.
- a decoder and a CRC detector are provided for each data channel, and the control parameters are set for each data channel. Provided.
- FIG. 21 is a diagram showing a ninth embodiment of the present invention.
- a decoder a CRC detector, a reference SIR control command determination unit, and a conversion table are prepared for the number of multiplexed data channels.
- the decoding process and the CRC detection are shared by a plurality of data channels and are used in time division, one decoder and one CRC detector may be used for each.
- the reference SIR update control by the outer loop is performed using T, Sine, and Sdec common to a plurality of data channels (corresponding to the second, third, and seventh embodiments)
- the reference SIR control command is determined.
- One unit and conversion table are commonly used for a plurality of data channels.
- a different reference SIR control command determination unit and conversion table are used for each data channel. .
- the transmission / reception of blocks is continuous (corresponding to the first to fifth embodiments)
- the number of observation frames and the number of reception blocks match or are proportional to each other. Only one of the ticks counter and the observation frames counter is required.
- block transmission / reception is discontinuous as in packet communication (corresponding to the sixth to eighth embodiments)
- Both an observation frame number counter for checking the expiration of the section and a reception block number counter for counting the number of reception blocks used for calculating control parameters are required.
- FIG. 22 is a diagram showing a problem of the updating method in the initial state of the reference SIR in the outer loop control.
- the initial reference SIR setting is too large, when each of the above embodiments is used, after the observation section elapses, it is reduced by .S dec, so the reference SIR is updated unless each observation section elapses However, it takes too long to reach a stable reference SIR value. If the initial value of the reference SIR is too small, the increase in the reference SIR is increased by S inc at the time of the error, so it rises faster than in the case of the decrease. Can be smaller than the magnitude of S dec, and again, it takes time to reach a steady state.
- FIG. 23 is a diagram schematically showing how the reference SIR of the outer loop control changes based on the tenth embodiment of the present invention.
- the update step value of the reference SIR in the initial state is set to a special value, so that even if the initial value of the reference SIR is too large or too small, The time required to reach the steady state can be shortened.
- the update frequency in the initial state for each frame it is possible to more quickly reach the steady state. Therefore, stable and high-quality communication can be achieved quickly.
- FIGS. 24 and 25 are diagrams illustrating a tenth embodiment of the present invention.
- the set reference SIR may be too large to satisfy the desired block error rate, that is, the error interval may be too long in the reference SIR. In such a case, it takes a long time for the reference SIR to settle to the minimum value required to satisfy the desired block error rate using the methods described above.
- the reference SIR is too large in the initial state of communication, errors are unlikely to occur, and if the above settings are used, the reference SIR can only be lowered for each observation section T. As shown in Fig. 2, the time to reach the steady state becomes longer.Conversely, if the reference SIR is too small in the initial state of communication, errors occur almost every frame, and the steady state is reached in a short time. Reach.
- the reference SIR in the initial state of communication, is reduced until no more than a predetermined number of errors occur, even if the observation interval T has not been reached when no error has occurred. Then, after a predetermined number of errors occur, the reference SIR is increased or decreased according to the algorithm shown in the first to third embodiments. By doing so, as shown in Fig. 23, even if the reference SI in the initial state of communication is too large, the time to reach the steady state is reduced, and interference to other users can be reduced. Stable communication can be performed faster.
- FIG. 24 is a flowchart of the tenth embodiment.
- step S80 the state is set to the initial state, and the number of reductions is reset.
- step S81 CRC detection is performed, and in step S82, it is determined whether there is no error as a result of the CRC detection. If it is determined in step S82 that there is no error, the In step S83, the reference SIR is reduced by a preset amount. On the other hand, if it is determined in step S82 that there is an error, in step S84, the reference SIR is increased by a predetermined amount. Then, in step S85, the number of times of increase is incremented, and the process proceeds to step S86.
- step S86 it is determined whether or not the number of times of increase is equal to or more than the set value. If not, the process returns to step S81. If it is determined in step S86 that the value is equal to or larger than the set value, the process proceeds to step S87, where the state is set to the steady state, and the process proceeds to the steady state.
- step S90 it is determined whether there is no error as a result of the CRC detection. If there is an error, in step S91, the reference SIR is increased by Sinc. If it is determined in step S90 that there is no error, the process proceeds to step S92, in which the number of observation blocks is incremented, and in step S93, the number of observation blocks is equal to or longer than the observation section. Determine whether you are strong or not.
- step S93 determines whether the determination in step S93 is N ⁇ . If the determination in step S93 is N ⁇ , the process returns to step S89. If the determination is YESS, the process proceeds to step S94. In step S94, the reference SIR is reduced by Sdec, and the process returns to step S88.
- the processing in the steady state is described as using the processing in the first embodiment.
- the present invention is not limited to this, and other embodiments can be used.
- the steps of increasing and decreasing the reference SIR in the initial state are given in advance.
- this giving method should be appropriately set by the designer.
- FIG. 25 is a block diagram of the device according to the tenth embodiment.
- the configuration shown in the figure is substantially the same as the block configuration of the ninth embodiment, except that a state setting unit for distinguishing between an initial state and a steady state is provided.
- the status of the reference SIR control unit set by the status setting unit is stored in the status holding register.
- the state setting section is provided with an increase counter, and counts the number of increases in the initial state. After performing the predetermined number of times of increase processing, it is determined that the steady state has been reached, and the routine shifts to the steady state reference SIR update processing.
- Each of the above-described embodiments can be used as a method of the reference SIR update processing.
- FIG. 26 and FIG. 27 are diagrams illustrating the eleventh embodiment of the present invention.
- the reference SIR is updated every block.
- the control amount of increase / decrease of the reference SIR in the initial state is set to a larger value than the increase / decrease amount in the steady state.
- the state shifts to the steady state, and normal outer loop control is performed in the manner described in the first to ninth embodiments.
- the steady state since the reference SIR is increased or decreased every frame, the steady state is reached in a short time even if the initial setting value of the reference SIR is too large or too small.
- FIG. 26 is a flowchart of the process of the first embodiment.
- step S100 the state is set to the initial state, the number of times of increase is reset, and the number of times of decrease is reset.
- step S101 CRC detection is performed.
- step S102 it is determined whether there is an error as a result of the CRC detection. If there is no error, the process proceeds to step S103, the reference SIR is reduced, and in step S105, the number of reductions is incremented, and the process proceeds to step S107. If it is determined in step S102 that there is an error, in step S104, the reference SIR is increased, and in step S106, the number of times of increase is incremented. Proceed to.
- step S107 it is determined whether or not both the number of times of increase and the number of times of decrease have exceeded the set value. If the determination in step S107 is NO, the process returns to step S101. If the determination in step S107 is YES, in step S108, the state is set to a steady state, and the process proceeds to step S109.
- step S109 the number of observation blocks is reset, and in step S110, CRC detection is performed.
- step S111 it is determined whether or not there is an error as a result of the CRC detection. If there is an error, in step S112, the reference SIR is increased by S inc and the process proceeds to step S109. Return. If it is determined in step S111 that there is no error, in step S113, the number of observation blocks is incremented. Judge. If the determination in step S114 is NO, return to step S110, and if the determination in step S114 is YES, proceed to step S115 and decrease the reference SIR by Sdec. And the process returns to step S109.
- the processing in the steady state can use the first to ninth embodiments.
- FIG. 27 is a block diagram of the device of the eleventh embodiment.
- the configuration is almost the same as that of the tenth embodiment, except that the state setting unit is provided with an increase frequency counter and configured to count the number of increase.
- the reference SIR control unit shifts from the initial state processing to the steady state processing when both the count value of the increment counter and the count value of the decrease counter become equal to or more than a predetermined value.
- the status of the reference SIR control unit is managed by the status setting unit, and the current status is stored in the status holding register.
- two parameters can be preferentially determined out of the block error observation section of the outer loop control, the increase S inc of the reference SIR, and the decrease S dec of the reference SIR.
- Flexibility can be given, and it can flexibly respond to the requirements of system and hardware design. Also, even if the reference SIR in the initial state of communication is too large, the time to reach the steady state is reduced, interference to other users can be reduced, and stable communication can be performed more quickly.
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2002558644A JP3839406B2 (ja) | 2001-01-17 | 2001-01-17 | アウターループ電力制御装置及び方法 |
PCT/JP2001/000267 WO2002058278A1 (fr) | 2001-01-17 | 2001-01-17 | Procede et dispositif de controle de la puissance en boucle externe |
EP01901393.7A EP1353456B1 (en) | 2001-01-17 | 2001-01-17 | Outer loop power control device and method |
US10/616,067 US7522561B2 (en) | 2001-01-17 | 2003-07-09 | Outer-loop power control device and method thereof |
Applications Claiming Priority (1)
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PCT/JP2001/000267 WO2002058278A1 (fr) | 2001-01-17 | 2001-01-17 | Procede et dispositif de controle de la puissance en boucle externe |
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US10/616,067 Continuation US7522561B2 (en) | 2001-01-17 | 2003-07-09 | Outer-loop power control device and method thereof |
Publications (1)
Publication Number | Publication Date |
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WO2002058278A1 true WO2002058278A1 (fr) | 2002-07-25 |
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ID=11736917
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PCT/JP2001/000267 WO2002058278A1 (fr) | 2001-01-17 | 2001-01-17 | Procede et dispositif de controle de la puissance en boucle externe |
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Country | Link |
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US (1) | US7522561B2 (ja) |
EP (1) | EP1353456B1 (ja) |
JP (1) | JP3839406B2 (ja) |
WO (1) | WO2002058278A1 (ja) |
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WO2004059872A1 (fr) * | 2002-12-31 | 2004-07-15 | Zte Corporation | Procede de regulation de puissance dans un systeme de communication mobile amrc large bande |
EP1540967A1 (en) * | 2002-09-12 | 2005-06-15 | Interdigital Technology Corporation | Method and system for adjusting downlink outer loop power to control target sir |
JP2006500805A (ja) * | 2002-09-23 | 2006-01-05 | テレフォンアクチーボラゲット エル エム エリクソン(パブル) | 移動無線システムにおける電力制御の方法及び装置 |
JP2006508625A (ja) * | 2002-11-26 | 2006-03-09 | インターディジタル テクノロジー コーポレイション | 無線通信システムのための外部ループ電力制御 |
JPWO2004068743A1 (ja) * | 2003-01-31 | 2006-05-25 | 日本電気株式会社 | 送信電力制御のための目標値制御方法、及びそれに用いる基地局制御装置並びに移動局 |
JP2007508759A (ja) * | 2003-10-17 | 2007-04-05 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | 外部ループ電力制御のための方法およびシステム |
CN1330107C (zh) * | 2003-09-08 | 2007-08-01 | 中兴通讯股份有限公司 | 一种wcdma系统功率控制方法 |
JP2007528673A (ja) * | 2004-03-10 | 2007-10-11 | インターデイジタル テクノロジー コーポレーション | ワイヤレス通信システムに対するアウターループ送信電力制御における信号対干渉目標の調整 |
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EP1540967A1 (en) * | 2002-09-12 | 2005-06-15 | Interdigital Technology Corporation | Method and system for adjusting downlink outer loop power to control target sir |
EP1540967A4 (en) * | 2002-09-12 | 2011-03-16 | Interdigital Tech Corp | METHOD AND SYSTEM FOR ADJUSTING THE POWER OF AN EXTERNAL LOOP IN A DOWNLINK AT A USEFUL SIGNAL RATIO / TARGET BROOMER SIGNAL |
JP2006500805A (ja) * | 2002-09-23 | 2006-01-05 | テレフォンアクチーボラゲット エル エム エリクソン(パブル) | 移動無線システムにおける電力制御の方法及び装置 |
US7423976B2 (en) | 2002-09-24 | 2008-09-09 | Interdigital Technology Corporation | Block error rate estimate reporting for target signal to interference ratio adjustment |
JP2006508625A (ja) * | 2002-11-26 | 2006-03-09 | インターディジタル テクノロジー コーポレイション | 無線通信システムのための外部ループ電力制御 |
JP2006187020A (ja) * | 2002-11-26 | 2006-07-13 | Interdigital Technology Corp | 無線通信システムのための外部ループ電力制御 |
JP4619956B2 (ja) * | 2002-11-26 | 2011-01-26 | インターデイジタル テクノロジー コーポレーション | 無線通信システムのための外部ループ電力制御 |
WO2004059872A1 (fr) * | 2002-12-31 | 2004-07-15 | Zte Corporation | Procede de regulation de puissance dans un systeme de communication mobile amrc large bande |
JPWO2004068743A1 (ja) * | 2003-01-31 | 2006-05-25 | 日本電気株式会社 | 送信電力制御のための目標値制御方法、及びそれに用いる基地局制御装置並びに移動局 |
JP4613822B2 (ja) * | 2003-01-31 | 2011-01-19 | 日本電気株式会社 | 送信電力制御のための目標値制御方法、及びそれに用いる基地局制御装置並びに移動局 |
CN1330107C (zh) * | 2003-09-08 | 2007-08-01 | 中兴通讯股份有限公司 | 一种wcdma系统功率控制方法 |
JP2007508759A (ja) * | 2003-10-17 | 2007-04-05 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | 外部ループ電力制御のための方法およびシステム |
JP2010158050A (ja) * | 2003-10-17 | 2010-07-15 | Telefon Ab L M Ericsson | 外部ループ電力制御のための方法およびシステム |
JP2007528673A (ja) * | 2004-03-10 | 2007-10-11 | インターデイジタル テクノロジー コーポレーション | ワイヤレス通信システムに対するアウターループ送信電力制御における信号対干渉目標の調整 |
Also Published As
Publication number | Publication date |
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JP3839406B2 (ja) | 2006-11-01 |
EP1353456A1 (en) | 2003-10-15 |
US20040008639A1 (en) | 2004-01-15 |
US7522561B2 (en) | 2009-04-21 |
EP1353456A4 (en) | 2010-01-20 |
EP1353456B1 (en) | 2016-04-20 |
JPWO2002058278A1 (ja) | 2004-05-27 |
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