US9271259B2 - Method and device for testing moving speed of terminal - Google Patents
Method and device for testing moving speed of terminal Download PDFInfo
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- US9271259B2 US9271259B2 US14/428,984 US201314428984A US9271259B2 US 9271259 B2 US9271259 B2 US 9271259B2 US 201314428984 A US201314428984 A US 201314428984A US 9271259 B2 US9271259 B2 US 9271259B2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
- G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
Definitions
- the present invention relates to the field of mobile communications and particularly to a method and device for testing the moving speed of a terminal.
- a terminal may move at a high speed so that a considerable Doppler shift will occur, and the amplitude of a signal may fade rapidly and the phase of the signal may vary rapidly particularly in a multi-path scenario, thus deteriorating the performance of the system. It is thus necessary for a receiving end to adjust adaptively algorithms related to channel estimation and signal detection dependent upon the current moving speed of the terminal, and to this end, an algorithm to measure the speed accurately is required to support such an adaptive adjustment strategy. At present there are the following algorithms to measure the speed:
- the crossing rate algorithm is very simple in principle and easy to perform and has been widely applied in real communication systems.
- the Doppler shift may result in a temporally fluctuating signal so that generally there is a deep fading of the amplitude of the signal once the terminal moves over a distance of half the wavelength.
- the number of times Le that the level fades per unit time can be counted to thereby estimate the speed.
- f m represents the largest Doppler dispersion
- ⁇ represents a correlation time
- ⁇ x ( ⁇ ) represents autocorrelation of the signal
- ⁇ 2 represents noise power
- J 0 (•) represents a Bessel function of the first kind of order zero with a curve as illustrated in FIG. 1 .
- a statistic of a time-domain autocorrelation value of the signal is made from the time-domain autocorrelation characteristic of the signal, and the Doppler dispersion f m is estimated against a lookup table of Bessel function curves to thereby estimate the moving speed.
- the equation (1) has to be revised for use in view of a direction of arrival distributed non-uniformly and affected by a Rician factor K over a Rician channel.
- a general problem with the crossing rate algorithm is how to count Le accurately. There may be a large number of observable burrs of the signal in time-domain being affected by noise and the channel. The number of times that the level fades can be counted accurately only after the signal is de-noised, de-burred, etc. Moreover the accuracy in estimation of the speed may also be affected by the statistic operation for the level crossing rate.
- the signal has to be preprocessed in the algorithm nevertheless at low precision.
- the count characteristic in the correlation algorithm can only be applicable to the Rayleigh channel but not to the Rician channel, so the algorithm has to be revised by the Rician factor in the other scenarios, but the Rician factor K may not be easy to determine, thus complicating the algorithm.
- the Bessel curve is not a monotonic function, and in order to estimate the speed accurately, 2 ⁇ f m ⁇ 4 shall be guaranteed, and if there is a significant Doppler dispersion f m at a high speed, then the Doppler dispersion can be estimated only if the value of ⁇ is very small, so that the correlation algorithm may be restricted greatly at a high speed.
- the statistic operation for autocorrelation may also affect the precision of the algorithm.
- Embodiments of the invention provide a method for testing a moving speed of a terminal so as to measure the moving speed of the terminal according to pilots, and noise power.
- An embodiment of the invention provides a method for testing a moving speed of a terminal, the method including:
- An embodiment of the invention provides a device for testing a moving speed of a terminal, the device including:
- a communicating module configured to receive a signal including a pilot sequence transmitted by a transmitting end
- a delay path determining module configured to determine a time-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to a known pilot sequence and the signal including the pilot sequence and to select a delay path according to the time-domain channel estimation values
- a speed determining module configured to determine the moving speed of the terminal according to the delay path selected in a preset length of time.
- the receiving end receives a signal including a pilot sequence transmitted by the transmitting end; the receiving end determines a time-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to a known pilot sequence and the signal including the pilot sequence and selects a delay path according to the time-domain channel estimation values; and the receiving end determines the moving speed of the terminal according to the delay path selected in a preset length of time.
- the receiving end in the embodiments of the invention can measure the moving speed of the terminal according to the pilots and the noise power, and with this method, the calculation can be performed simply using the available received pilots, and the statistic of the delay path can be made simply, accurately and adaptively to easily get a high precision without being affected by any factor of the algorithm; with this method, only the statistic of the channel response values of the frequencies at which the pilots are located will be made to thereby lower an effort of calculation; and moreover the algorithm with a low delay can be applicable to scenarios at different delays and different speeds, and the process of testing the speed can be performed before the channel estimation is performed on the signal, and the result thereof can be applicable directly to the current channel estimation and signal detection processes.
- FIG. 1 illustrates a schematic flow chart of a method for testing a moving speed of a terminal according to an embodiment of the invention
- FIG. 2 illustrates a schematic flow chart of a particular embodiment of a method for testing a moving speed of a terminal according to an embodiment of the invention
- FIG. 3 illustrates a schematic flow chart of another particular embodiment of a method for testing a moving speed of a terminal according to an embodiment of the invention
- FIG. 4 illustrates a schematic structural diagram of a device for testing a moving speed of a terminal according to an embodiment of the invention.
- FIG. 5 illustrates another schematic structural diagram of a device for testing a moving speed of a terminal according to an embodiment of the invention.
- Embodiments of the invention provide a method for testing a moving speed of a terminal so as to measure the moving speed of the terminal according to pilot and noise power to thereby improve the precision in measurement.
- a method for testing a moving speed of a terminal includes:
- Operation S 101 A receiving end receives a signal including a pilot sequence transmitted by a transmitting end;
- Operation S 102 The receiving end determines a time-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence, according to a known pilot sequence and the signal including the pilot sequence and selects a delay path according to the time-domain channel estimation values;
- Operation S 103 The receiving end determines the moving speed of the terminal according to the delay path selected in a preset length of time.
- a delay path There are typically a number of transmission paths with different delays in transmission over a real space channel, and these different transmission paths are embodied as corresponding power values at different points of time in time-domain channel estimation, where a peak point with a power value above some threshold is referred to as a delay path.
- the operation S 101 furthermore includes: the receiving end determines noise power when the signal including the pilot sequence is received, and a signal to noise ratio corresponding to the noise power; and the operation S 102 is performed by the receiving end upon determining that the signal to noise ratio is above a first preset threshold, that is, furthermore the noise power when the signal including the pilot sequence is received and the signal to noise ratio corresponding to the noise power is required to be determined, and it is determined that the signal to noise ratio is above the first preset threshold, before the operation S 102 .
- the receiving end determines a frequency-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence, according to the known pilot sequence and the signal including the pilot sequence;
- the receiving end determines the time-domain channel estimation value corresponding to each pilot symbol according to the frequency-domain channel estimation value corresponding to the pilot symbol.
- the delay path is selected in the operation S 102 as follows:
- the receiving end selects the delay path with the highest power for each pilot symbol
- the receiving end determines the location of the selected delay path with the highest power, and if the receiving end determines that locations of delay paths selected for pilot symbols at the same frequency-domain location are different,
- the receiving end determines one of the locations of the delay paths and determines the delay path corresponding to the location as the delay path selected for the pilot symbols at the same frequency-domain location, or selects the location of the delay path maximizing the sum of power of the delay paths corresponding to the pilots at the same frequency-domain location and determines the delay path corresponding to the location as the delay path selected for the pilot symbols at the same frequency-domain location.
- the location of the delay path refers to a point of time corresponding to the delay path in time-domain channel estimation.
- the operation S 103 includes: the receiving end determines an average variation of the delay path selected in the preset length of time according to the delay path in the preset length of time; and
- the receiving end determines the moving speed of the terminal according to the average variation of the delay path.
- the receiving end determines the average of the variation of the delay path selected in the preset length of time according to the delay path in the preset length of time as follows:
- the receiving end groups together a plurality of pilot symbols at the same frequency-domain location determined in the preset length of time and calculates variations of the delay path of the pilot symbols spaced by a preset number of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the respective groups;
- OFDM Orthogonal Frequency Division Multiplexing
- the receiving end determines the averages of the variations of the delay path in the respective groups respectively according to the variations of the delay path of the pilot symbols spaced by the preset number of OFDM symbols in the respective groups;
- the receiving end determines the average variation of the delay path in the preset length of time according to the averages of the variations of the delay path in the respective groups.
- the receiving end increases the preset number of spacing OFDM symbols and recalculates the average of the variation of the delay path.
- the receiving end determines the moving speed of the terminal according to the average variation of the delay path as follows:
- the receiving end determines the moving speed of the terminal according to the average variation of the delay path, and a pre-stored relationship between the average variation of the delay path and the moving speed of the terminal.
- the receiving end determines the noise power when the signal including the pilot sequence is received
- the receiving end determines the average noise power in the preset length of time according to the noise power
- the method further includes:
- the receiving end revises the average of the variation of the delay path by the average noise power in the preset length of time.
- the receiving end calculates the averages of the variations in the respective groups according to the variations of the delay path in the respective groups;
- the receiving end calculates the squares of the differences between the variations in the respective groups and the averages
- the receiving end removes the variations with the squares of the differences above a third preset threshold
- the receiving end determines the averages of the variations of the delay path in the respective groups respectively by averaging the variations of the delay path remaining after the variations with the squares of the variations above the third preset threshold in the respective groups are removed.
- the invention can also be applicable to a communication system in which a signal including a pilot is transmitted, e.g., a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA), a Long Term Evolution (LTE), a Long Term Evolution-Advanced (LTE-A), etc. Since the data transmitted in the pilot is known, an accurate channel estimation value can be derived directly in the simple Least Square (LS) method, and since the speed is measured before channel estimation is performed on the signal, the current speed measurement result can be applied directly to the current channel estimation and signal detection processes.
- LS Least Square
- the transmitting end can be a base station, and the receiving end can be a terminal; or the transmitting end can be a terminal, and the receiving end can be a base station.
- the moving speed of the terminal can be measured particularly in the following steps:
- Operation S 201 The receiving end receives a signal including a pilot sequence transmitted by the transmitting end;
- the receiving end obtains and stores noise power P noise of the receiving end upon reception of the signal.
- the receiving end determines power of the received signal and determines a corresponding signal to noise ratio according to the power of the received signal and the noise power. Since the precision in measurement may be degraded at a low signal to noise ratio, it can be specified for the signal to noise ratio that the precision in measurement is determined to be satisfactory when the signal to noise ratio is above a first preset threshold, and at this time measurement of the speed can be initiated; otherwise, a default or null value can be applied.
- REs Resource Elements
- IFFT Inverse Fast Fourier Transform
- Operation S 204 A delay path with the highest power (simply referred to as the strongest path) is selected. That is, the strongest path is determined respectively for h i of each pilot symbol, and taking the pilots in the operation S 202 as an example, the locations of selected delay paths for h 1 , h 2 , h 3 and h 4 are the value of n corresponding to
- n 1 , L , N pilot ⁇
- n the value of n corresponding to
- n 1 , L , N pilot ⁇
- n the value of n corresponding to
- n 1 , L , N pilot ⁇
- n 1 , L , N pilot ⁇ [
- ] can be taken, so that there is only one location of the selected strongest path with a corresponding value of n denoted as n 0 (k), where i 1 (k),i 2 (k) represents the indexes of a group of symbols at the same frequency-domain location, and k represent the number of the group; and channel estimation is performed on each group of two symbols at the same frequency-domain location.
- the values h i 1 (k) (n 0 (k)) and h i 2 (k) (n 0 (k)) of the n 0 (k)-th path in each group are stored.
- Operation S 205 Variations of the delay path of adjacent pilot symbols in respective sub-frames are obtained by calculating time-domain channel variations according to the stored delay path with the highest power for time-domain channel estimation, taking the downlink LTE system as an example, as follows:
- the first and third columns of pilot symbols are the same, and the frequency-domain locations of the second and fourth columns of pilot symbols are the same, the first and third columns are grouped together, and the second and fourth columns are grouped together, and the variations of the delay path of the adjacent pilot symbols are calculated.
- a smoothing process can be further performed to remove the sub-frames for the statistic operation, with errors above a third threshold and then average the results, particularly as follows: the averages E′[( ⁇ H′) 2 (k) ] of the respective variations in the respective groups of ( ⁇ H′) 2 (k) are calculated respectively; the squares of the differences ⁇ 1 , ⁇ 2 , ⁇ 3 . . .
- a threshold is applied to the measurement, and if the value of the measured speed is below a second preset threshold, e.g., 30 km/h, then the spacing between each group of pilots for calculation is increased, the statistic operation is performed again, and the measurement result is processed.
- a second preset threshold e.g. 30 km/h
- pilot symbols at the same frequency-domain location are grouped together so that the pilots in the group are spaced by 7 OFDM symbols, and if the measurement result is below the threshold, then a low-speed scenario can be determined, and at this time if pilot symbols spaced by one sub-frame are grouped together, then the pilots in the group are spaced by 14 OFDM symbols, i.e., twice the original spacing, and accordingly the measurement result obtained by referring to a lookup table or the substitution into the equation is also halved.
- pilot symbols spaced by one radio frame are grouped together, then the pilots in the group are spaced by 140 OFDM symbols, i.e., 20 times the original spacing, and accordingly the measurement result obtained by referring to a lookup table or the substitution into the equation is also reduced by a factor of 20, i.e., the real speed.
- Operation S 206 E[( ⁇ H′) 2 (k) ] is revised by the average noise power.
- ⁇ k E ⁇ [ ( ⁇ ⁇ ⁇ H ′ ) ( k ) 2 ] - 2 ⁇ ⁇ 2 E (
- ⁇ H can be calculated in the simulation particularly as follows:
- the value of M shall be large enough to guarantee higher precision of the created equation or table and consequentially the precision in measurement, where it can be judged whether the value of M is sufficiently large by judging whether the statistic result of ⁇ H is stable as M is further increased (the M is typically on the order of a thousand of frames or more in the LTE system); and the value of N is decided by the acceleration available to the UE and the precision required for the measurement.
- the value of N shall be set small (in the LTE system, if the highest acceleration is 2.8 km/s 2 , then a potentially introduced error in measurement is 10 km/s 2 at N of 100) so that a delay of the measurement value relative to the real value and consequentially the resulting largest error in measurement will not be too large.
- a smoothing process can be performed on a number of results of testing the speed for higher precision in measurement.
- the speed can be measured using the delay path in a simple calculation procedure at a low delay, applicable to scenarios at different delays and different speeds, and the process of testing the speed can be performed before channel estimation is performed on the signal, the result thereof can be applicable directly to the current channel estimation and signal detection processes; and moreover since the result is revised in view of the noise and removing the variations of the delay path with significant mean squared errors, etc., thereby improving the precision in measurement of the speed.
- the precision of the measurement result can be guaranteed even at a low speed by increasing the spacing between the pilots while performing the calculation.
- CMMB China Mobile Multimedia Broadcasting
- Operation S 301 The terminal receives a CMMB broadcast signal including a pilot sequence, where pilot symbols of the CMMB signal are consecutive;
- the terminal obtains and stores noise power P noise of the receiving end upon reception of the signal.
- Operation S 302 The terminal derives frequency-domain channel estimation values according to the received pilot symbols and known pilot symbols, derives time-domain channel estimation values h i according to the frequency-domain channel estimation values, and then selects a delay path with the highest power from h i and determines the location n i of the delay path with the highest power for h i where n i represents the value of n corresponding to
- n 1 , L , N pilot ⁇
- , and i 0, 1, . . . , 52. If the locations of delay paths with the highest power for pilot symbols at the same frequency-domain location are different, then an uniform location of a uniform delay path for use in calculation can be applied under some rule, for example, the location of the delay path with the highest power for the first symbol can be taken as a reference.
- noise reduction can be performed on the received signal in the frequency-domain before this operation to thereby improve the precision of data.
- Operation S 303 The pilot symbols of the CMMB signal are consecutive, including odd pilot symbols at the same frequency-domain location and even pilot symbols at the same frequency-domain locations, so channel estimation is performed on every four symbols grouped together, which are denoted as h 0 , h 1 , h 2 and h 3 , and results of ( ⁇ H′) 2 of the odd and even symbols are calculated respectively as variations of the delay path with the highest power in the equations of:
- Operation S 305 ( ⁇ H′) 2 is revised by the average noise power.
- ⁇ even ( ⁇ ⁇ ⁇ H ′ ) even 2 - 2 ⁇ ⁇ 2 E (
- ⁇ odd ( ⁇ ⁇ ⁇ H ′ ) odd 2 - 2 ⁇ ⁇ 2 E (
- Operation S 307 “ ⁇ H ⁇ V” relationship tables are referred to according to ⁇ H to thereby estimate the current moving speed of the terminal.
- a signal to noise ratio or channel delay information will not be distinguished in the table, and the number of stored tables can be determined according to the number of levels into which the measured speed is divided, e.g., M levels, where only (M ⁇ 1) ⁇ H ⁇ V relationship tables need to be stored.
- the lowest measured speed can be determined directly without referring to any relationship table.
- N, M, and the levels of the speed can be selected as required for the precision in measurement.
- a device for testing a moving speed of a terminal includes:
- a communicating module 41 is configured to receive a signal including a pilot sequence transmitted by a transmitting end
- a delay path determining module 42 is configured to determine a time-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to a known pilot sequence and the signal including the pilot sequence and to select a delay path according to the time-domain channel estimation values;
- a speed determining module 43 is configured to determine the moving speed of the terminal according to the delay path selected in a preset length of time.
- the device further includes a first noise determining module configured to determine noise power when the signal including the pilot sequence is received, and to determine a signal to noise ratio corresponding to the noise power according to the noise power.
- a first noise determining module configured to determine noise power when the signal including the pilot sequence is received, and to determine a signal to noise ratio corresponding to the noise power according to the noise power.
- the delay path determining module 42 is configured:
- the first noise determining module determines that the signal to noise ratio is above a first preset threshold.
- the delay path determining module 42 includes:
- a time-domain channel estimation value determining unit 51 is configured to determine a frequency-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to the known pilot sequence and the signal including the pilot sequence, and
- a delay path selecting unit 52 is configured to select the delay path according to the time-domain channel estimation values.
- the delay path selecting unit 52 is configured:
- the speed determining module 43 includes:
- a delay path calculating unit 53 is configured to determine an average variation of the delay path selected in the preset length of time according to the delay path in the preset length of time;
- a speed calculating unit 54 is configured to determine the moving speed of the terminal according to the average variation of the delay path.
- the delay path calculating unit 53 is configured:
- the speed calculating unit 54 is configured:
- the delay path calculating unit 53 is further configured:
- the device further includes:
- a second noise determining module is configured to determine noise power when the signal including the pilot sequence is received, and to determine the average noise power in the preset length of time according to the noise power;
- the delay path calculating unit 53 is further configured:
- the delay path calculating unit 53 configured to determine the averages of the variations of the delay path in the respective groups respectively according to the variations of the delay path of the pilot symbols spaced by the preset number of OFDM symbols in the respective groups is configured:
- the receiving end receives a signal including a pilot sequence transmitted by the transmitting end; the receiving end determines a channel response function corresponding to the signal of each pilot sequence being transmitted, according to a pre-stored pilot sequence and the signal including the pilot sequence and determines a corresponding delay path according to the channel response function; and the receiving end determines the moving speed of the terminal according to the delay path.
- the embodiments of the invention provide a method and device for testing a moving speed of a terminal so as to measure the moving speed of the terminal according to pilots and noise power so as to improve the precision in measurement.
- the embodiments of the invention can be embodied as a method, a system or a computer program product. Therefore the invention can be embodied in the form of an all-hardware embodiment, an all-software embodiment or an embodiment of software and hardware in combination. Furthermore the invention can be embodied in the form of a computer program product embodied in one or more computer useable storage mediums (including but not limited to a disk memory, a CD-ROM, an optical memory, etc.) in which computer useable program codes are contained.
- a computer useable storage mediums including but not limited to a disk memory, a CD-ROM, an optical memory, etc.
- These computer program instructions can also be stored into a computer readable memory capable of directing the computer or the other programmable data processing device to operate in a specific manner so that the instructions stored in the computer readable memory create an article of manufacture including instruction means which perform the functions specified in the flow(s) of the flow chart and/or the block(s) of the block diagram.
- These computer program instructions can also be loaded onto the computer or the other programmable data processing device so that a series of operational steps are performed on the computer or the other programmable data processing device to create a computer implemented process so that the instructions executed on the computer or the other programmable device provide steps for performing the functions specified in the flow(s) of the flow chart and/or the block(s) of the block diagram.
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Abstract
Description
ρx(τ)=σ2 J 0(2πf mτ) (1)
h i(n)=IFFT(H p(i)), n=1,L,N pilot.
the value of n corresponding to
the value of n corresponding to
and the value of n corresponding to
respectively. Typically the locations of the strongest paths as a result of channel estimation on pilot symbols at the same frequency-domain location are the same, and if they are different, then some symbol can be taken as a reference, or the value of n corresponding to
can be taken, so that there is only one location of the selected strongest path with a corresponding value of n denoted as n0(k), where i1(k),i2(k) represents the indexes of a group of symbols at the same frequency-domain location, and k represent the number of the group; and channel estimation is performed on each group of two symbols at the same frequency-domain location. Taking the LTE as an example, there are two groups of i1,i2, i.e., i1(1)=1, i2 (1)=3 and i1(2)=2, i2(2)=4. The values hi
and i=0, 1, . . . , 52. If the locations of delay paths with the highest power for pilot symbols at the same frequency-domain location are different, then an uniform location of a uniform delay path for use in calculation can be applied under some rule, for example, the location of the delay path with the highest power for the first symbol can be taken as a reference.
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CN201210365083.5A CN103686830A (en) | 2012-09-26 | 2012-09-26 | Method and device for measuring movement speed of terminal |
CN201210365083.5 | 2012-09-26 | ||
CN201210365083 | 2012-09-26 | ||
PCT/CN2013/078394 WO2014048150A1 (en) | 2012-09-26 | 2013-06-28 | Method and device for testing moving speed of terminal |
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CN105992241B (en) * | 2015-02-27 | 2019-08-06 | 电信科学技术研究院 | A kind of estimation method and device of moving velocity of terminal |
CN106877985B (en) * | 2015-12-11 | 2020-10-13 | 皓创科技(镇江)有限公司 | Method for processing pilot symbols and node equipment |
CN105848198B (en) * | 2016-03-18 | 2019-07-02 | 京信通信系统(中国)有限公司 | A kind of method and device of determining terminal velocity |
US10045346B1 (en) * | 2016-08-02 | 2018-08-07 | Sprint Spectrum L.P. | Assigning a low-GDV carrier to a high-speed UE |
JP7187314B2 (en) * | 2016-09-29 | 2022-12-12 | シャープ株式会社 | TERMINAL DEVICE, BASE STATION DEVICE, COMMUNICATION METHOD, AND INTEGRATED CIRCUIT |
CN108574955B (en) * | 2017-03-07 | 2023-04-14 | 中兴通讯股份有限公司 | Method and device for measurement optimization in mobility scene based on UE trigger |
CN110268759B (en) * | 2017-03-09 | 2021-10-22 | 华为技术有限公司 | Wireless communication method, control equipment, node and terminal equipment |
CN114337968B (en) * | 2021-12-28 | 2023-06-06 | 湖南智领通信科技有限公司 | Active pilot frequency adjusting method and device based on real-time measurement and control data |
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