CN102263600B - Method and device for determining movement speed of terminal - Google Patents
Method and device for determining movement speed of terminal Download PDFInfo
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- CN102263600B CN102263600B CN2010101946493A CN201010194649A CN102263600B CN 102263600 B CN102263600 B CN 102263600B CN 2010101946493 A CN2010101946493 A CN 2010101946493A CN 201010194649 A CN201010194649 A CN 201010194649A CN 102263600 B CN102263600 B CN 102263600B
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Abstract
The invention discloses a method and device for determining movement speed of a terminal, which relates to the field of wireless communication and is used for lowering the complexity for determining the movement speed of the terminal. The method comprises the following steps: measuring a Channel Quality Indicator (CQI) of a wireless channel between a terminal and a base station; determining a Level Crossing Rate (LCR) of the measured CQI; and determining the movement speed corresponding to the LCR according to the preset relationship between the LCR and movement speed, and determining that the movement speed is the movement speed of the terminal. The invention can effectively lower the complexity for determining the movement speed of the terminal, and is hardly influenced by noise.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of method and apparatus of definite moving velocity of terminal.
Background technology
In present mobile communication system, the speed of portable terminal is a very important parameters.If the translational speed of terminal is known in the base station, in carrying out resource management, can optimize a lot of parameters, the performance of system is improved greatly.From the second generation (2G) to the third generation (3G), the 4th generation (4G) cell mobile communication systems, the speed of travelling carriage has obtained application more and more widely, especially with Long Term Evolution (LongTerm Evolution, LTE) system is in the accurate 4G system of representative, the speed of travelling carriage is a key parameter of elevator system performance, the speed of travelling carriage can be used for determine scheduling strategy, downlink transfer pattern to switch and configuration detection reference signal (Sounding Reference Signal, SRS) cycle parameter etc.
In the cell mobile communication systems, common mobile station speed algorithm for estimating mainly is divided into three major types: parameter Estimation class algorithm, non-parametric estmation class algorithm and auxiliary estimation class algorithm.Wherein, the thought of parameter Estimation class algorithm is based on the parameter that some that calculate to receive signal comprise velocity information and calculates maximum doppler frequency, and then obtain translational speed, common parameter comprises: level crossing rate (lcr) (Level Crossing Rate, LCR), zero-crossing rate (Level Crossing Rate, ZCR), auto-correlation coefficient (ACF), auto-covariance (COV) etc.; Non-parametric estmation class algorithm is also referred to as Classical Spectrum to be estimated, it estimates maximum doppler frequency then, and then obtain translational speed by the classical power spectrum of direct method or indirect method acquisition channel; Auxiliary estimation class algorithm comprises: (Global Positioning System, optional equipment GPS) assist algorithm for estimating and assist algorithm for estimating based on the cellular network of power control commands word (TPC), switching (HO) frequency based on global positioning system.
A kind of method relatively more classical in the parameter Estimation class algorithm is LCR algorithm and ZCR algorithm.Wherein, the LCR algorithm calculates the speed of travelling carriage by the envelope level percent of pass of estimating received signal; The ZCR algorithm, the in-phase component by estimating received signal or the zero percent of pass of quadrature component calculate the speed of travelling carriage.Another kind of common method is the ACF algorithm in the parameter Estimation class algorithm.This algorithm is based on classical rayleigh fading channel power spectral density function, derive the corresponding auto-correlation function of classical Rayleigh spectrum, derive then and obtain the relational expression of speed and auto-correlation coefficient, the autocorrelation value substitution relational expression that to utilize the channel fading coefficient to try to achieve then estimates concrete velocity amplitude at last.
Non-parametric estmation class algorithm is divided into direct method and indirect method based on Fourier transform.Direct method is calculated the frequency spectrum of the direct picked up signal of Fourier transform of N data; Indirect method is to calculate the auto-correlation function of N data earlier, calculates the frequency spectrum of the Fourier transform picked up signal of auto-correlation function then.No matter be direct method or indirect method, the non-parametric estmation algorithm all is to calculate maximum doppler frequency, estimates concrete velocity amplitude then.
In realizing process of the present invention, the inventor finds to exist in the prior art following technical problem:
In the parameter Estimation class algorithm, it is more serious that the LCR/ZCR algorithm is subjected to The noise, also is subjected to the influence of power control easily, and the complexity of algorithm and precision are all undesirable; Need suppose current channel fading Rayleigh distributed based on the speed estimation algorithms of ACF, thereby measure concrete velocity amplitude, and wireless channel alters a great deal in the actual environment, the general very difficult this distribution of obeying.This method estimates that in the actual wireless channel velocity amplitude that obtains is very inaccurate.
Non-parametric estmation class algorithm requires to obtain equally spaced time-domain sampling point, and computation complexity is higher, and test the speed range limited in available time-domain sampling at interval.Auxiliary estimate in the class algorithm that be subject to the positioning accuracy of GPS itself based on the GPS positioning algorithm based, overhead is big; Relevant with the power control strategy that current system adopts based on the auxiliary algorithm for estimating of the cellular network of TPC, be subject to concrete system configuration.
Summary of the invention
The embodiment of the invention provides a kind of method and apparatus of definite moving velocity of terminal, for reducing the complexity of estimating moving velocity of terminal.
A kind of method of definite moving velocity of terminal, this method comprises:
The channel quality indicator (CQI) value of the wireless channel between measuring terminals and base station;
Determine the mean value of each CQI value of measuring; Pass through the number of the CQI value of this mean value in the CQI value of determining to measure with positive slope; Described number is defined as the level crossing rate (lcr) LCR value of described a plurality of CQI values;
According to the corresponding relation of predefined LCR value and translational speed, determine the translational speed that described LCR value is corresponding, this translational speed is defined as the translational speed of described terminal.
A kind of communication equipment, this equipment comprises:
The CQI measuring unit is for the channel quality indicator (CQI) value of the wireless channel between measuring terminals and base station;
The LCR determining unit is for the mean value of each CQI value of determining to measure; Pass through the number of the CQI value of this mean value in the CQI value of determining to measure with positive slope; Described number is defined as the level crossing rate (lcr) LCR value of described a plurality of CQI values;
The speed determining unit is used for the corresponding relation according to predefined LCR value and translational speed, determines the corresponding translational speed of LCR value that described LCR determining unit is determined, this translational speed is defined as the translational speed of described terminal.
In the scheme that the embodiment of the invention provides, the CQI value of the wireless channel between measuring terminals and base station at first, and determine the LCR value of the CQI value that measures, then according to the corresponding relation of predefined LCR value and translational speed, determine the translational speed that this LCR value is corresponding, this translational speed is defined as the translational speed of terminal.As seen, adopt the present invention, only need to determine that system itself namely needs the LCR value of the CQI value measured, and can determine the translational speed of terminal according to the corresponding relation of predefined LCR value and translational speed, implementation complexity reduces greatly.
Description of drawings
The method flow schematic diagram that Fig. 1 provides for the embodiment of the invention;
The device structure schematic diagram that Fig. 2 provides for the embodiment of the invention.
Embodiment
In order to reduce the complexity of estimating moving velocity of terminal, the embodiment of the invention provides a kind of method of definite moving velocity of terminal, in this method, utilizes channel quality indication (CQI) information to determine the mobile speed of terminal
Referring to Fig. 1, the method for definite moving velocity of terminal that the embodiment of the invention provides specifically may further comprise the steps:
Step 10: the CQI value of the wireless channel between measuring terminals and base station;
Step 11: the LCR value of determining each CQI value of measuring;
Step 12: according to the corresponding relation of predefined LCR value and translational speed, the translational speed of the LCR value correspondence of determining in the determining step 11 is defined as this translational speed the translational speed of terminal.
In the step 10, during the CQI value of the wireless channel between measuring terminals and base station, can be in the setting-up time section with the setting measurement cycle, the CQI value of the wireless channel between measuring terminals and base station.In order to guarantee to measure a plurality of CQI values, the length of this setting-up time section should be greater than the setting measurement cycle.
When the executive agent of step 10-step 12 was the base station, the CQI value of measurement was the CQI value of uplink wireless channel, and when executive agent was terminal, the CQI value of measurement was the CQI value of downlink wireless channel.
In the step 11, determine that the concrete mode of the LCR value of the CQI value that measures can be as follows:
At first, determine the mean value of each CQI value of measuring;
Then, pass through the number of the CQI value of this mean value in each CQI value of determining to measure with positive slope; And the LCR value of the CQI value that this number is defined as measuring.
In the step 12, the corresponding relation of predefined LCR value and translational speed can be the table of comparisons or the control curve of LCR value and translational speed, then can be by searching this table of comparisons or control curve, the translational speed that the LCR value of determining in the determining step 11 is corresponding.This table of comparisons can be concrete interval corresponding relation.The corresponding translational speed of certain LCR value interval [X, Y] km/h for example.Can determine this table of comparisons or control curve by emulation.
In the step 12, the corresponding relation of predefined LCR value and translational speed can also be the functional relation of translational speed and LCR value, then this functional relation of LCR value substitution of determining in the step 11 can be calculated the corresponding translational speed of this LCR value.Specifically can determine this functional relation according to following steps:
For each translational speed in a plurality of translational speeds that arrange, measuring terminals is under this translational speed and the CQI value of the wireless channel between the base station, determines the LCR value of the CQI value that measures;
Each LCR value and each translational speed of determining are carried out formula fitting, obtain the functional relation of translational speed and LCR value.This formula fitting can be once linear formula fitting, quadratic formula match etc.
Below the present invention is specifically described:
The core concept of this patent is to utilize CQI information to test the speed, and the translational speed of portable terminal is more high, and channel variation is more fast, the suffered time selective fading of terminal is more serious, and this variation is reflected on the CQI, the translational speed that terminal also can occur is more high, and the variation of CQI is more fast.Utilize this relation, can the CQI that measure be handled, obtain the velocity information of portable terminal.
In wireless communication system, need usually to measure CQI to assess the quality of current system.Usually, CQI is more high, and the capacity that channel can transmit is more high, and the information of CQI can be obtained in the cycle.By the processing of CQI information being obtained the translational speed of terminal, specific as follows:
The mode of CQI information and LCR is carried out combination to this programme and traditional LCR difference is, the mean value of the CQI that the level here refers to.Mainly can be divided into following step:
Step 1: the terminal of some and the CQI value of the wireless channel between the base station in period measurement a period of time;
Step 2: calculate the mean value of the CQI value that measures in a period of time, calculate CQI value in this section period and pass through the number of times of its mean value with positive slope, i.e. the LCR value of CQI, the mean value calculation formula of CQI value is as follows;
Step 3: according to the LCR value that step 2 obtains, determine the translational speed of terminal, its scheme can adopt following two kinds:
Scheme one: determine the translational speed relation of different LCR values and terminal by emulation, form the table of comparisons or the control curve of a LCR and moving velocity of terminal, in realization by tabling look-up or looking into the translational speed that curve can obtain terminal.This table can be concrete interval corresponding relation.Certain LCR value counterpart terminal translational speed [X, Y] km/h for example.
Scheme two: different translational speeds is set, and for each translational speed that arranges, measuring terminals is under this translational speed and the CQI value of the wireless channel between the base station, determines the LCR value of the CQI value that measures; Each LCR value and each translational speed of determining are carried out formula fitting, obtain the functional relation of translational speed and LCR value; Bring the LCR value that calculates in the step 2 into this functional relation, thereby calculate corresponding moving velocity of terminal.
In different systems, the method for measurement of CQI value can be different, are example with the LTE system, and the measurement of CQI comprises following two steps:
Step 1: calculate the signal to noise ratio of each subcarrier, this signal to noise ratio obtains by calculating each subcarrier signals power and noise power;
γ wherein
kIt is the signal to noise ratio of k subcarrier of OFDM symbol; H
kBe the channel impulse response of k subcarrier,
It is noise power;
Step 2: the signal to noise ratio of all subcarriers of corresponding bandwidth is mapped as a CQI value; Mapping method has a variety of, is example with the EESM mapping method:
Wherein, β is a parameter, and it estimates N from the link level simulation result of each link mode (modulation and coding mode)
uBe for the subcarrier number of calculating, CQI
nIt is the channel quality information that records in n cycle.
In said process, the measuring period of CQI and Measuring Time can directly influence precision and the scope of portable terminal tachometric survey, and the measuring period of CQI is more little, and the time of measurement is more long, precision is more high, and this scheme has also been avoided shortcoming affected by noise in traditional LCR and the improvement project thereof simultaneously.
Referring to Fig. 2, the embodiment of the invention also provides a kind of communication equipment, and this equipment comprises:
CQI measuring unit 20 is for the channel quality indicator (CQI) value of the wireless channel between measuring terminals and base station;
LCR determining unit 21 is for the level crossing rate (lcr) LCR value of determining the CQI value that described CQI measuring unit measures;
Speed determining unit 22 is used for the corresponding relation according to predefined LCR value and translational speed, determines the corresponding translational speed of LCR value that described LCR determining unit is determined, this translational speed is defined as the translational speed of described terminal.
Described CQI measuring unit 20 is used for:
In the setting-up time section with the setting measurement cycle, the CQI value of the wireless channel between measuring terminals and base station.
Described LCR determining unit 21 is used for:
Determine the mean value of the CQI value that measures;
Pass through the number of the CQI value of this mean value in the CQI value of determining to measure with positive slope;
Described number is defined as the LCR value of described a plurality of CQI values.
Described speed determining unit 22 is used for:
When described corresponding relation is the table of comparisons of LCR value and translational speed or control curve, by searching the described table of comparisons or control curve, determine the translational speed that described LCR value is corresponding.
Described speed determining unit 22 is used for:
When described corresponding relation is the functional relation of translational speed and LCR value, with the described functional relation of described LCR value substitution, calculate the corresponding translational speed of this LCR value.
This communication equipment also comprises:
First concerns determining unit 23, is used for determining the described table of comparisons or control curve by emulation.
This communication equipment also comprises:
Second concerns determining unit 24, is used for each translational speed for a plurality of translational speeds that arrange, and measuring terminals is under this translational speed and the CQI value of the wireless channel between the base station, determines the LCR value of the CQI value that measures;
Each LCR value and described each translational speed of determining are carried out formula fitting, obtain the functional relation of translational speed and LCR value.
This communication equipment is base station or terminal.
To sum up, beneficial effect of the present invention comprises:
In the scheme that the embodiment of the invention provides, the CQI value of the wireless channel between measuring terminals and base station at first, and determine the LCR value of the CQI value that measures, then according to the corresponding relation of predefined LCR value and translational speed, determine the translational speed that this LCR value is corresponding, this translational speed is defined as the translational speed of terminal.As seen, adopt the present invention, only need to determine that system itself namely needs the LCR value of the CQI value measured, and can determine the translational speed of terminal according to the corresponding relation of predefined LCR value and translational speed, implementation complexity reduces greatly.
Computation complexity of the present invention is low, system itself needs to measure the CQI value, to obtain current channel quality information, utilize CQI information to test the speed, the amount of calculation that increases is that level crossing rate (lcr) LCR produces, and tables look-up in the subsequent treatment, looks into curve or utilizes formula computing terminal translational speed, amount of calculation is all limited, and the precision of tachometric survey and scope are all guaranteed.
The present invention is affected by noise hardly, because CQI itself is exactly signal to noise ratio, the factor of noise has been taken into account, so affected by noise hardly;
The present invention can be applicable to the various wireless communication system, for example, and HSPA and LTE system.
The present invention can be applied in the multiple wireless environment, for example can pass through the table of comparisons or the control curve different to different scene configuration, adapt to different application scenarioss, if adopt the method for formula, can dispose different parameters and adapt to different scenes.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software embodiment or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form of the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make and carry out the sequence of operations step producing computer implemented processing at computer or other programmable devices, thereby be provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame in the instruction that computer or other programmable devices are carried out.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative concept of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. the method for a definite moving velocity of terminal is characterized in that, this method comprises:
The channel quality indicator (CQI) value of the wireless channel between measuring terminals and base station;
Determine the mean value of each CQI value of measuring; Pass through the number of the CQI value of this mean value in the CQI value of determining to measure with positive slope; Described number is defined as the level crossing rate (lcr) LCR value of described a plurality of CQI values;
According to the corresponding relation of predefined LCR value and translational speed, determine the translational speed that described LCR value is corresponding, this translational speed is defined as the translational speed of described terminal.
2. the method for claim 1 is characterized in that, the CQI value of the wireless channel between described measuring terminals and base station comprises:
In the setting-up time section with the setting measurement cycle, the CQI value of the wireless channel between measuring terminals and base station.
3. method as claimed in claim 1 or 2, it is characterized in that, described corresponding relation is the table of comparisons or the control curve of LCR value and translational speed, and described corresponding relation according to predefined LCR value and translational speed determines that the corresponding translational speed of described LCR value comprises:
By searching the described table of comparisons or control curve, determine the translational speed that described LCR value is corresponding.
4. method as claimed in claim 1 or 2 is characterized in that, described corresponding relation is the functional relation of translational speed and LCR value, and described corresponding relation according to predefined LCR value and translational speed determines that the corresponding translational speed of described LCR value comprises:
With the described functional relation of described LCR value substitution, calculate the corresponding translational speed of this LCR value.
5. method as claimed in claim 3 is characterized in that, determines the described table of comparisons or control curve by emulation.
6. method as claimed in claim 4 is characterized in that, determines described functional relation according to following steps:
For each translational speed in a plurality of translational speeds that arrange, measuring terminals is under this translational speed and the CQI value of the wireless channel between the base station, determines the LCR value of the CQI value that measures;
Each LCR value and described each translational speed of determining are carried out formula fitting, obtain the functional relation of translational speed and LCR value.
7. a communication equipment is characterized in that, this equipment comprises:
The CQI measuring unit is for the channel quality indicator (CQI) value of the wireless channel between measuring terminals and base station;
The LCR determining unit is for the mean value of each CQI value of determining to measure; Pass through the number of the CQI value of this mean value in the CQI value of determining to measure with positive slope; Described number is defined as the level crossing rate (lcr) LCR value of described a plurality of CQI values;
The speed determining unit is used for the corresponding relation according to predefined LCR value and translational speed, determines the corresponding translational speed of LCR value that described LCR determining unit is determined, this translational speed is defined as the translational speed of described terminal.
8. communication equipment as claimed in claim 7 is characterized in that, described CQI measuring unit is used for:
In the setting-up time section with the setting measurement cycle, the CQI value of the wireless channel between measuring terminals and base station.
9. as claim 7 or 8 described communication equipments, it is characterized in that described speed determining unit is used for:
When described corresponding relation is the table of comparisons of LCR value and translational speed or control curve, by searching the described table of comparisons or control curve, determine the translational speed that described LCR value is corresponding.
10. as claim 7 or 8 described communication equipments, it is characterized in that described speed determining unit is used for:
When described corresponding relation is the functional relation of translational speed and LCR value, with the described functional relation of described LCR value substitution, calculate the corresponding translational speed of this LCR value.
11. communication equipment as claimed in claim 7 is characterized in that, this communication equipment is base station or terminal.
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| CN108235358A (en) * | 2016-12-15 | 2018-06-29 | 南宁富桂精密工业有限公司 | Receiver and the method that the speed that mobile terminal moves is measured using receiver |
| CN111163416B (en) | 2018-10-22 | 2021-05-11 | 中国移动通信有限公司研究院 | Information acquisition method, information transmission method, terminal and first network equipment |
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