CN110087191B - Method and device for estimating time advance - Google Patents
Method and device for estimating time advance Download PDFInfo
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- CN110087191B CN110087191B CN201810069380.2A CN201810069380A CN110087191B CN 110087191 B CN110087191 B CN 110087191B CN 201810069380 A CN201810069380 A CN 201810069380A CN 110087191 B CN110087191 B CN 110087191B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/025—Services making use of location information using location based information parameters
- H04W4/027—Services making use of location information using location based information parameters using movement velocity, acceleration information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
Abstract
The invention provides a time advance estimation method and a device, which can predict that a terminal moves to a position for performing timing advance adjustment according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal after acquiring the current position of the terminal, the moving speed of the terminal and the moving route of the terminal, and further estimate the time advance according to the position for performing timing advance adjustment at this time of the terminal, thereby realizing the estimation of the time advance according to the position of the terminal, enabling a base station to estimate the time advance without an uplink signal, solving the problems of uplink resource waste, high service delay and large time advance estimation error caused by the estimation of the time advance according to the uplink signal, and being used as a supplementary method for time advance estimation, being capable of improving the reliability of service transmission.
Description
Technical Field
The invention belongs to the technical field of time advance processing, and particularly relates to a time advance estimation method and device.
Background
An uplink TA (Timing Advance) mechanism is introduced into an LTE (Long Term Evolution) system, so that a base station can adjust the offset of each terminal through the uplink TA mechanism to control the time when uplink signals of different terminals reach the base station, so that the time when the uplink signals of different terminals reach the base station is the same, and thus, the Orthogonal property of OFDM (Orthogonal Frequency Division Multiplexing) can be fully utilized to eliminate interference between terminals.
At present, an uplink TA mechanism needs a terminal to send an uplink signal to a base station when estimating TA, and the base station can estimate TA only after receiving the uplink signal, so that when the terminal does not need to send the uplink signal, the base station needs to allocate a segment of uplink bandwidth to enable the terminal to send the uplink signal if the base station wants to estimate TA, which increases signaling overhead and causes uplink resource waste. And when the quality of the uplink signal is poor or the uplink bandwidth for transmitting the uplink signal is small, the TA error estimated by the base station is increased, and the probability of uplink desynchronization of the terminal is increased under the condition that the terminal cannot receive the TA issued by the base station or the received TA is inaccurate, and the uplink desynchronized terminal needs to reacquire uplink synchronization with the base station through a random access process to transmit the uplink signal again, which causes a large service delay.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method and an apparatus for estimating a timing advance, so that a base station can estimate a TA without an uplink signal, thereby solving a series of problems caused by the need of an uplink signal for estimating the TA. The technical scheme is as follows:
the invention provides a time advance estimation method, which comprises the following steps:
acquiring the current position of a terminal, the moving speed of the terminal and the moving route of the terminal;
predicting that the terminal moves to a position where the timing advance adjustment is carried out at this time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal;
estimating the time advance according to the position of the terminal for performing timing advance adjustment at this time;
and sending the time lead to the terminal so as to apply the time lead when the terminal moves to the position for timing advance adjustment.
Preferably, the method further comprises: and estimating the time required by the terminal to move to the position for carrying out timing advance adjustment next time according to the position for carrying out timing advance adjustment at this time by the terminal, the moving speed of the terminal and the moving route of the terminal.
Preferably, the estimating, according to the position of the terminal performing timing advance adjustment this time, the moving speed of the terminal, and the moving route of the terminal, a time required for the terminal to move to the position of performing timing advance adjustment next time includes:
obtaining the displacement of the terminal from the position where the timing advance adjustment is carried out at this time to the position where the timing advance adjustment is carried out next time according to the preset timing advance adjustment step length;
estimating the position of the terminal for carrying out timing advance adjustment next time according to the position of the terminal for carrying out timing advance adjustment this time, the moving route of the terminal and the displacement;
and estimating the time required by the terminal to move to the position for carrying out timing advance adjustment next time according to the position for carrying out timing advance adjustment this time of the terminal, the moving speed of the terminal and the position for carrying out timing advance adjustment next time of the terminal.
Preferably, the predicting that the terminal moves to the position where the timing advance adjustment is performed this time according to the current position of the terminal, the moving speed of the terminal, and the moving route of the terminal includes:
estimating the time required by the terminal to move from the current position to the position subjected to the timing advance adjustment at this time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal;
and under the condition that the estimated time required for the terminal to move from the current position to the position for performing the timing advance adjustment at this time is consistent with the preset time, predicting that the terminal moves to the position for performing the timing advance adjustment at this time.
The present invention also provides a base station, comprising:
the terminal comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring the current position of the terminal, the moving speed of the terminal and the moving route of the terminal;
the prediction unit is used for predicting that the terminal moves to the position which is adjusted in advance at the time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal;
the advance estimation unit is used for estimating the time advance according to the position of the terminal for carrying out timing advance adjustment at this time;
and the sending unit is used for sending the time advance to the terminal so as to apply the time advance when the terminal moves to the position for performing the timing advance adjustment.
Preferably, the base station further includes: and the time estimation unit is used for estimating the time required by the terminal to move to the position for carrying out the timing advance adjustment next time according to the position for carrying out the timing advance adjustment at this time of the terminal, the moving speed of the terminal and the moving route of the terminal.
Preferably, the time estimation unit includes:
a displacement obtaining subunit, configured to obtain, according to a preset timing advance adjustment step length, a displacement of the terminal moving from a position where the timing advance adjustment is performed this time to a position where the timing advance adjustment is performed next time;
a position estimation subunit, configured to estimate a position of the terminal for performing timing advance adjustment next time according to the position of the terminal for performing timing advance adjustment this time, the moving route of the terminal, and the displacement;
and the time estimation subunit is used for estimating the time required by the terminal to move to the position for next timing advance adjustment according to the position for the current timing advance adjustment of the terminal, the moving speed of the terminal and the position for the next timing advance adjustment of the terminal.
Preferably, the predicting unit is specifically configured to estimate, according to the current position of the terminal, the moving speed of the terminal, and the moving route of the terminal, a time required for the terminal to move from the current position to the position where the timing advance adjustment is performed this time, and predict that the terminal will move to the position where the timing advance adjustment is performed this time when the estimated time required for the terminal to move from the current position to the position where the timing advance adjustment is performed this time is consistent with a preset time.
The present invention also provides a base station, comprising: a processor and a communication interface;
the processor is configured to acquire a current position of a terminal, a moving speed of the terminal, and a moving route of the terminal, predict, according to the current position of the terminal, the moving speed of the terminal, and the moving route of the terminal, that the terminal will move to a position where timing advance adjustment is performed this time, estimate a time advance according to the position where timing advance adjustment is performed this time by the terminal, and send the time advance to the terminal through the communication interface, so that the time advance is applied when the terminal moves to the position where timing advance adjustment is performed this time.
The present invention also provides a storage medium having a program stored thereon, which when executed by a processor implements the above-described timing advance estimation method.
According to the technical scheme, after the current position of the terminal, the moving speed of the terminal and the moving route of the terminal are obtained, the position where the terminal moves to the current time of timing advance adjustment can be predicted according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal, and then the time advance is estimated according to the position where the terminal performs the timing advance adjustment, so that the time advance is estimated according to the position of the terminal, and the base station can estimate the time advance without an uplink signal, so that the problems of uplink resource waste, high service delay and large time advance estimation error caused by the time advance estimation according to the uplink signal are solved, and the method can be used as a supplement method for estimating the time advance and can improve the reliability of service transmission.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a TA estimation method according to an embodiment of the present invention;
FIG. 2 is a diagram of an application scenario provided by an embodiment of the present invention;
fig. 3 is a schematic diagram of an application scenario of train starting according to an embodiment of the present invention;
fig. 4 is a schematic view of an application scenario in which a train operates at a constant speed according to an embodiment of the present invention;
FIG. 5 is another flow chart of a TA estimation method according to an embodiment of the present invention;
FIG. 6 is a flow chart of time estimation in a TA estimation method according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a time estimation unit in a base station according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flowchart of a TA estimation method according to an embodiment of the present invention is shown, which is implemented to perform TA estimation according to a location of a terminal, and specifically includes the following steps:
101: the current position of the terminal, the moving speed of the terminal and the moving route of the terminal are obtained. It can be understood that: the moving route of the terminal is a moving route set for the terminal by an application scene where the terminal is located, for example, in the application scene of rail transit, the terminal is located in a train of the rail transit, and the rail transit can set a plurality of running routes for the train, so that the running route where the train is located can be determined after the current position of the terminal is obtained, and the running route where the train is located is determined as the moving route of the terminal.
The manner in which the current location of the terminal is obtained may be, but is not limited to: the method includes obtaining a speed measurement positioning method, for example, a doppler radar method among a plurality of speed measurement positioning methods, obtaining a running direction and a moving speed of a train by the doppler radar method according to a doppler effect when the train where the terminal is located runs, obtaining a current position of the train according to the running direction and the moving speed of the train, determining the current position of the train as the current position of the terminal, and determining the moving speed of the train as the moving speed of the terminal. Or the current position of the terminal may be obtained through an Automatic Train Supervision (ATS) system of the Train, where the ATS system periodically sends Train information according to a certain frequency, and the Train information at least includes a track number of the Train where the terminal is located, so that the base station obtains the current position of the Train according to the track number, and determines the current position of the Train as the current position of the terminal.
102: and predicting that the terminal moves to the position for performing timing advance adjustment at this time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal.
In this embodiment, the purpose of predicting whether the terminal will move to the position where the timing advance adjustment is performed this time is to: and estimating the TA in advance and transmitting the TA so that the estimated TA can be applied when the terminal moves to the position for timing advance adjustment. One possible way to predict whether the terminal will move to the position where the timing advance adjustment is performed this time is as follows:
estimating the time required by the terminal to move from the current position to the position which is subjected to timing advance adjustment at this time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal; and under the condition that the estimated time required for the terminal to move from the current position to the position for performing the timing advance adjustment at this time is consistent with the preset time, predicting that the terminal moves to the position for performing the timing advance adjustment at this time.
That is, the position of the terminal performing the timing advance adjustment this time is obtained in advance, then the time required from the current position to the position performing the timing advance adjustment this time is estimated, and if the required time is the same as the preset time, the terminal will move to the position performing the timing advance adjustment this time.
The preset time may be determined according to actual application, for example, if the estimated TA is carried in TAC (Timing Advance Command) and sent to the terminal, the present protocol provides: if the terminal receives the TAC in the subframe n and applies the TAC to the first uplink subframe after n +6, which means that the time from the terminal receiving the TAC to the application of the TA carried in the TAC is 6ms (millisecond), the preset time can be obtained according to the time from the terminal receiving the TAC to the application of the TA carried in the TAC and the time from the base station to the terminal, and if the preset time is set, the preset time is but not limited to: the sum of the time from the terminal receiving the TAC to the TA carried in the application TAC and the time from the base station estimating the TA to the terminal receiving the TA.
103: and estimating the TA according to the position of the terminal to be moved to the time for timing advance adjustment.
104: and sending the TA to the terminal, for example, carrying the TA in the TAC and sending the TA to the terminal so as to apply the TA when the terminal moves to the position for timing advance adjustment at this time.
Referring to fig. 2, when the terminal is at position a in fig. 2, the terminal applies the last estimated TA to adjust the time of the uplink signal reaching the base station to be aligned with the subframe boundary of the base station. As the terminal moves forward, the distance between the terminal and the base station becomes closer and closer, and the uplink TA of the terminal becomes larger and larger. When the base station acquires the position B of the terminal, predicting that the terminal moves to a position D which is subjected to timing advance adjustment at this time according to the position B, the moving speed of the terminal and the moving route of the terminal, estimating TA by the base station according to the position D at this time, carrying the TA in a TAC and sending the TA to the terminal; when the terminal moves to the position C, the terminal receives the TAC, and if the terminal receives the TAC in the subframe n according to the protocol, the TAC is applied to the first uplink subframe after n + 6; therefore, when the terminal moves to the position D, the terminal adjusts the time of the uplink signal arriving at the base station to be aligned with the subframe boundary of the base station again by using the TAC received at the position C.
According to the technical scheme, after the current position of the terminal, the moving speed of the terminal and the moving route of the terminal are obtained, the position where the terminal moves to the current time of timing advance adjustment can be predicted according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal, and then the time advance is estimated according to the position where the terminal performs the timing advance adjustment, so that the time advance is estimated according to the position of the terminal, and the base station can estimate the time advance without an uplink signal, so that the problems of uplink resource waste, high service delay and large time advance estimation error caused by the time advance estimation according to the uplink signal are solved, and the method can be used as a supplement method for estimating the time advance and can improve the reliability of service transmission.
Specifically, taking the example that the terminal is in a train and the position, the moving speed and the moving route of the train can be regarded as the position, the moving speed and the moving route of the terminal, the TA estimation method provided by the embodiment of the invention is applied to a train starting scene and a train constant-speed running scene, and the moving route of the train is a straight line route in the train starting scene and the train constant-speed running scene. The description of the operating conditions of a train in GB/T7928-2003 Universal technical Condition for underground railway vehicles is as follows:
the highest moving speed of the train is not lower than 80 Km/H;
average acceleration at train start: accelerating from 0 to 40Km/H, not less than 0.83m/s2；
Accelerating from 0 to 80Km/H, not less than 0.5m/s2；
Average deceleration at train braking: average deceleration of service brake is not less than 1.0m/s2；
The average deceleration during emergency braking is not less than 1.2m/s2；
According to the above specification, in the train starting scene and the train constant speed running scene based on the embodiment of the present invention, it is assumed that the actual running conditions of the train are as follows:
the moving speed of the train at the constant speed running stage is 80Km/H, namely 22 m/s;
the acceleration from 0 to 80Km/H is 1m/s when the train is started2；
The deceleration of the train during normal braking is 2m/s2；
The train runs on a straight track.
And assume TA adjustment step size of 16 Ts-16 (1/30720) ms-0.52-106s (for example only, the TA adjustment step size may be configured to other values according to the TA adjustment algorithm), and the light speed is 3 x 108m/s, so the displacement when the terminal goes from the last TA adjustment to the current TA adjustment is 0.52 x 106s*3*108When the terminal moves 156m, a TA adjustment is triggered, and the base station needs to estimate the TA and send the TA to the terminal together with the TAC before the terminal moves 156 m.
In the embodiment of the present invention, an application scenario diagram of train starting is shown in fig. 3, when a train starts, the train is located at a position a shown in fig. 3, and a moving time T is 0, and a time when an uplink signal reaches a base station is aligned with a subframe boundary of the base station;
the formula for calculating the moving distance of the train in the uniform acceleration state is as follows:
①
the moving speed calculation formula of the train in the uniform acceleration state is as follows: v ═ v0+a*t②
Wherein v is0Is the initial speed of the train, t is the running time of the train, and a is the acceleration of the train.
Because the moving speed of the train is 22m/s in the constant speed state, the train can enter the constant speed state only after running for 22s according to the formula II. As can be seen from the formula (I), the time for the train to run 156m is 17.663 s. Therefore, the TA adjustment is required once during the uniform acceleration of the train.
And assuming that the time from the TA estimation by the base station to the TA reception by the terminal is 50ms (according to the processing capability of the base station, which is only illustrated in the embodiment of the present invention), that is, the time between the position B and the position C is 50ms, and the terminal receives the TA and applies the TA after 6ms, that is, the time between the position C and the position D (the position where the timing is adjusted in advance this time) is 6ms, so the time between the position B and the position D is 56ms, which means that the base station predicts the position B, which needs to perform the TA estimation, according to the acceleration and the moving speed of the train and the time between the position B and the position D, so when the base station acquires that the current position of the terminal is the position B, the terminal can be predicted to move to the position D according to the current position, acceleration, the moving speed and the moving route, and therefore the base station estimates the TA according to the position D at the position. The prediction process of the position B is as follows:
when the time taken for the train to travel to the position D (i.e., the travel 156m) is 17.663s and the time difference between the position B and the position D is 56ms, the time taken for the train to travel to the position B is 17.607s, and it can be seen from the formula (i) that the displacement of the train relative to the time when t is 0 is 150m, that is, the position moved 150m from the position a is the position B.
In the embodiment of the present invention, an application scenario schematic diagram of a train running at a constant speed is shown in fig. 4, when the train is at a position a, T is 0, a train running speed is 22m/s (80Km/H), and a calculation formula of a train moving distance in a constant speed state is: s ═ v0T, therefore, according to this formula and the displacement from the last TA adjustment to the current TA adjustment is 156m, when the train moves from position a for 7091ms, the current TA adjustment needs to be performed, and because the TA estimation is performed from the base station until the current TA adjustment becomes effective for 56ms, the TA estimation is performed from the base station when the train moves from position a for 7035ms, so that according to the formula s v0T may calculate that the base station starts to perform TA estimation after moving 154.77m from the location a, i.e. location B in fig. 4, which indicates that the terminal will move to the location D where the timing advance adjustment is performed this time, and the base station estimates and transmits TA according to the location D, so that the terminal receives TA at the location C and applies the TA at the location D.
According to the application scene of train starting and the application scene of train constant speed running, the TA estimation method can estimate the TA according to the position of the terminal, so that the base station can estimate the TA without uplink signals, and a series of problems caused by the estimation of the TA according to the uplink signals are solved.
Referring to fig. 5, which shows another flowchart of the TA estimation method according to the embodiment of the present invention, on the basis of fig. 1, the method may further include the following steps:
105: and estimating the time required by the terminal to move to the position for next timing advance adjustment according to the position for the terminal to perform the timing advance adjustment at this time, the moving speed of the terminal and the moving route of the terminal, so that TA estimation can be performed before the estimated time, and TA adjustment according to the time is realized.
In this embodiment, the process of estimating the time required for the terminal to move to the next position for timing advance adjustment is shown in fig. 6, and may include the following steps:
1051: and according to the preset timing advance adjustment step length, obtaining the displacement of the terminal from the position where the timing advance adjustment is carried out at this time to the position where the timing advance adjustment is carried out next time. If the preset timing advance adjustment step length is x, the calculation formula of the displacement of the terminal from the position where the timing advance adjustment is performed at this time to the position where the timing advance adjustment is performed next time is as follows:
l x Ts x (1/30720) 10 light speed-3*3*108L represents a displacement of the terminal from the position at which the timing advance adjustment is performed this time to the position at which the timing advance adjustment is performed next time.
1052: and estimating the position of the terminal for carrying out timing advance adjustment next time according to the position of the terminal for carrying out timing advance adjustment this time, the moving route and the displacement of the terminal. Since the moving path of the terminal may include a curve, and the displacement of the terminal moving from the position where the timing advance adjustment is performed this time to the position where the timing advance adjustment is performed next time is a linear distance between the position where the timing advance adjustment is performed this time and the position where the timing advance adjustment is performed next time, it is necessary to estimate the position where the timing advance adjustment is performed next time by the terminal according to the position where the timing advance adjustment is performed this time by the terminal, the moving path and the displacement of the terminal.
When the moving routes of the terminal are all composed of straight lines, the position of the terminal for carrying out timing advance adjustment next time is the sum of the position and the displacement of the timing advance adjustment at this time; when the moving route of the terminal includes at least one curve, the linear distance from the position where the timing advance adjustment is performed at this time needs to be obtained by combining the moving route as the position where the displacement indication value is taken, and the position is the position where the timing advance adjustment is performed next time by the terminal.
1053: and estimating the time required by the terminal to move to the position for next timing advance adjustment according to the position for the terminal to perform the timing advance adjustment at this time, the moving speed of the terminal and the position for the terminal to perform the timing advance adjustment at the next time.
For example, if the terminal is running at a constant speed of v m/s, the time required for the terminal to move to the next position for timing advance adjustment is: and T is S/v (ms), and S is the difference value between the position of the terminal for performing the timing advance adjustment at this time and the position for performing the timing advance adjustment at the next time. Also for example, the terminal has an acceleration of a m/s2Initial velocity v0And m/s is uniformly accelerated, so that the time required for the terminal to move to the position for timing advance adjustment next time is as follows:
suppose that the time from the reception of TA to the next position where timing advance adjustment is performed by the terminal is Δ t1(6 ms as above), the base station performs TA estimation until the time Δ t when the terminal receives TA2Therefore, after obtaining the time required for the terminal to move to the position where timing advance adjustment is performed next time, the time for the terminal to move when the base station performs the next TA estimation can be obtained as follows: T-Deltat1-△t2。
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
Corresponding to the foregoing method embodiment, an embodiment of the present invention further provides a base station, where the structure of the base station is shown in fig. 7, and the base station may include: an acquisition unit 11, a prediction unit 12, an advance estimation unit 13, and a transmission unit 14.
An obtaining unit 11, configured to obtain a current position of the terminal, a moving speed of the terminal, and a moving route of the terminal. It can be understood that: the moving route of the terminal is a moving route set for the terminal by an application scene where the terminal is located, for example, in the application scene of rail transit, the terminal is located in a train of the rail transit, and the rail transit can set a plurality of running routes for the train, so that the running route where the train is located can be determined after the current position of the terminal is obtained, and the running route where the train is located is determined as the moving route of the terminal. For obtaining the current position of the terminal and the moving speed of the terminal, refer to the related description in the above method embodiment, and this embodiment is not described again.
And the predicting unit 12 is used for predicting that the terminal moves to the position where the timing advance adjustment is performed at this time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal. In this embodiment, the purpose of predicting whether the terminal will move to the position where the timing advance adjustment is performed this time is to: and estimating the TA in advance and transmitting the TA so that the estimated TA can be applied when the terminal moves to the position for timing advance adjustment. One possible way to predict whether the terminal will move to the position where the timing advance adjustment is performed this time is as follows:
estimating the time required by the terminal to move from the current position to the position which is subjected to timing advance adjustment at this time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal; and under the condition that the estimated time required for the terminal to move from the current position to the position for performing the timing advance adjustment at this time is consistent with the preset time, predicting that the terminal moves to the position for performing the timing advance adjustment at this time.
That is, the position of the terminal performing the timing advance adjustment this time is obtained in advance, then the time required from the current position to the position performing the timing advance adjustment this time is estimated, and if the required time is the same as the preset time, the terminal will move to the position performing the timing advance adjustment this time. For the description of the preset time, refer to the related description in the method embodiment, which is not described again.
And an advance estimation unit 13, configured to estimate TA according to a position where the terminal performs timing advance adjustment this time.
A sending unit 14, configured to send the TA to the terminal, for example, the TA may be carried in the TAC and sent to the terminal, so that the TA is applied when the terminal moves to the position where the timing advance adjustment is performed this time.
According to the technical scheme, after the current position of the terminal, the moving speed of the terminal and the moving route of the terminal are obtained, the position where the terminal moves to the current time of timing advance adjustment can be predicted according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal, and then the time advance is estimated according to the position where the terminal performs the timing advance adjustment, so that the time advance is estimated according to the position of the terminal, and the base station can estimate the time advance without an uplink signal, so that the problems of uplink resource waste, high service delay and large time advance estimation error caused by the time advance estimation according to the uplink signal are solved, and the method can be used as a supplement method for estimating the time advance and can improve the reliability of service transmission.
Referring to fig. 8, another structure of a base station according to an embodiment of the present invention is shown, and based on fig. 7, the base station may further include: the time estimation unit 15 is configured to estimate a time required for the terminal to move to a next position where the timing advance adjustment is performed according to the position where the timing advance adjustment is performed by the terminal this time, the moving speed of the terminal, and the moving route of the terminal, so that TA estimation can be performed before the estimated time, and TA adjustment according to the time is achieved.
In this embodiment, the structure of the time estimation unit 15 is shown in fig. 9, and may include: a displacement obtaining subunit 151, a position estimating subunit 152, and a time estimating subunit 153.
And a displacement obtaining subunit 151, configured to obtain, according to a preset timing advance adjustment step length, a displacement that the terminal moves from the position where the timing advance adjustment is performed this time to the position where the timing advance adjustment is performed next time. If the preset timing advance adjustment step length is x, the calculation formula of the displacement of the terminal from the position where the timing advance adjustment is performed at this time to the position where the timing advance adjustment is performed next time is as follows:
l x Ts x (1/30720) 10 light speed-3*3*1089.76 x (m), L indicates that the terminal performs timing advance adjustment from this timeThe entire position is shifted to the next position for timing advance adjustment.
And the position estimation operator unit 152 is configured to estimate a position where the terminal performs timing advance adjustment next time according to the position where the terminal performs timing advance adjustment this time, the moving route and the displacement of the terminal. Since the moving path of the terminal may include a curve, and the displacement of the terminal moving from the position where the timing advance adjustment is performed this time to the position where the timing advance adjustment is performed next time is a linear distance between the position where the timing advance adjustment is performed this time and the position where the timing advance adjustment is performed next time, it is necessary to estimate the position where the timing advance adjustment is performed next time by the terminal according to the position where the timing advance adjustment is performed this time by the terminal, the moving path and the displacement of the terminal.
When the moving routes of the terminal are all composed of straight lines, the position of the terminal for carrying out timing advance adjustment next time is the sum of the position and the displacement of the timing advance adjustment at this time; when the moving route of the terminal includes at least one curve, the linear distance from the position where the timing advance adjustment is performed at this time needs to be obtained by combining the moving route as the position where the displacement indication value is taken, and the position is the position where the timing advance adjustment is performed next time by the terminal.
And the time estimation subunit 153 is configured to estimate a time required for the terminal to move to the position where the timing advance adjustment is performed next time according to the position where the timing advance adjustment is performed this time by the terminal, the moving speed of the terminal, and the position where the timing advance adjustment is performed next time by the terminal. For example, if the terminal is running at a constant speed of v m/s, the time required for the terminal to move to the next position for timing advance adjustment is: and T is S/v (ms), and S is the difference value between the position of the terminal for performing the timing advance adjustment at this time and the position for performing the timing advance adjustment at the next time. Also for example, the terminal has an acceleration of a m/s2Initial velocity v0And m/s is uniformly accelerated, so that the time required for the terminal to move to the position for timing advance adjustment next time is as follows:
suppose that the time from the reception of TA to the next position where timing advance adjustment is performed by the terminal is Δ t1(6 ms as above), the base station performs TA estimation until the time Δ t when the terminal receives TA2Therefore, after obtaining the time required for the terminal to move to the position where timing advance adjustment is performed next time, the time for the terminal to move when the base station performs the next TA estimation can be obtained as follows: T-Deltat1-△t2。
In addition, the present invention also provides another base station, including: a processor and a communication interface. The processor is used for acquiring the current position of the terminal, the moving speed of the terminal and the moving route of the terminal, predicting that the terminal will move to the position where the timing advance adjustment is carried out at this time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal, estimating TA according to the position where the timing advance adjustment is carried out at this time of the terminal, and sending the TA to the terminal through the communication interface so that the TA can be applied when the terminal moves to the position where the timing advance adjustment is carried out at this time.
The process of predicting that the terminal will move to the position where the timing advance adjustment is performed at this time by the terminal according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal may be: estimating the time required by the terminal to move from the current position to the position which is subjected to timing advance adjustment at this time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal; and under the condition that the estimated time required for the terminal to move from the current position to the position for performing the timing advance adjustment at this time is consistent with the preset time, predicting that the terminal moves to the position for performing the timing advance adjustment at this time.
The processor is further configured to estimate a time required for the terminal to move to a next position for timing advance adjustment according to the position of the terminal for timing advance adjustment this time, the moving speed of the terminal, and the moving route of the terminal. Preferably, the estimating, by the processor, a time required for the terminal to move to a next position where the timing advance adjustment is performed according to the position where the timing advance adjustment is performed by the terminal this time, the moving speed of the terminal, and the moving route of the terminal includes:
obtaining the displacement of the terminal from the position where the timing advance adjustment is carried out at this time to the position where the timing advance adjustment is carried out next time according to the preset timing advance adjustment step length; estimating the position of the terminal for carrying out timing advance adjustment next time according to the position of the terminal for carrying out timing advance adjustment this time, the moving route and the displacement of the terminal; and estimating the time required by the terminal to move to the position for next timing advance adjustment according to the position for the terminal to perform the timing advance adjustment at this time, the moving speed of the terminal and the position for the terminal to perform the timing advance adjustment at the next time.
The present invention also provides a storage medium having a program stored thereon, which when executed by a processor implements the TA estimation method described above.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A method of timing advance estimation, the method comprising:
acquiring the current position of a terminal, the moving speed of the terminal and the moving route of the terminal;
predicting that the terminal moves to the position for performing timing advance adjustment at this time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal, wherein the method comprises the following steps: estimating the time required by the terminal to move from the current position to the position subjected to the timing advance adjustment at this time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal; when the estimated time required for the terminal to move from the current position to the position for performing the timing advance adjustment at this time is consistent with the preset time, predicting that the terminal will move to the position for performing the timing advance adjustment at this time, wherein the preset time is the sum of the time from the time when the terminal receives the timing advance command to the time when the timing advance command is applied and the time from the time when the base station estimates the time advance to the time when the terminal receives the time advance;
estimating the time advance according to the position of the terminal for performing timing advance adjustment at this time;
and sending the time lead to the terminal so as to apply the time lead when the terminal moves to the position for timing advance adjustment.
2. The method of claim 1, further comprising: and estimating the time required by the terminal to move to the position for carrying out timing advance adjustment next time according to the position for carrying out timing advance adjustment at this time by the terminal, the moving speed of the terminal and the moving route of the terminal.
3. The method according to claim 2, wherein the estimating the time required for the terminal to move to the next position for timing advance adjustment according to the position of the terminal for timing advance adjustment this time, the moving speed of the terminal and the moving route of the terminal comprises:
obtaining the displacement of the terminal from the position where the timing advance adjustment is carried out at this time to the position where the timing advance adjustment is carried out next time according to the preset timing advance adjustment step length;
estimating the position of the terminal for carrying out timing advance adjustment next time according to the position of the terminal for carrying out timing advance adjustment this time, the moving route of the terminal and the displacement;
and estimating the time required by the terminal to move to the position for carrying out timing advance adjustment next time according to the position for carrying out timing advance adjustment this time of the terminal, the moving speed of the terminal and the position for carrying out timing advance adjustment next time of the terminal.
4. A base station, characterized in that the base station comprises:
the terminal comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring the current position of the terminal, the moving speed of the terminal and the moving route of the terminal;
a prediction unit for predicting the terminal will move to the position for timing advance adjustment according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal, wherein, the method comprises the steps of estimating the time required by the terminal to move from the current position to the position which is adjusted in advance at the current time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal, predicting that the terminal moves to the position for timing advance adjustment this time under the condition that the estimated time required for the terminal to move from the current position to the position for timing advance adjustment this time is consistent with the preset time, the preset time is the sum of the time from the time when the terminal receives the timing advance command to the time when the timing advance command is applied to carry the time advance and the time from the time when the base station estimates the time advance to the time when the terminal receives the time advance;
the advance estimation unit is used for estimating the time advance according to the position of the terminal for carrying out timing advance adjustment at this time;
and the sending unit is used for sending the time advance to the terminal so as to apply the time advance when the terminal moves to the position for performing the timing advance adjustment.
5. The base station of claim 4, wherein the base station further comprises: and the time estimation unit is used for estimating the time required by the terminal to move to the position for carrying out the timing advance adjustment next time according to the position for carrying out the timing advance adjustment at this time of the terminal, the moving speed of the terminal and the moving route of the terminal.
6. The base station of claim 5, wherein the time estimation unit comprises:
a displacement obtaining subunit, configured to obtain, according to a preset timing advance adjustment step length, a displacement of the terminal moving from a position where the timing advance adjustment is performed this time to a position where the timing advance adjustment is performed next time;
a position estimation subunit, configured to estimate a position of the terminal for performing timing advance adjustment next time according to the position of the terminal for performing timing advance adjustment this time, the moving route of the terminal, and the displacement;
and the time estimation subunit is used for estimating the time required by the terminal to move to the position for next timing advance adjustment according to the position for the current timing advance adjustment of the terminal, the moving speed of the terminal and the position for the next timing advance adjustment of the terminal.
7. A base station, characterized in that the base station comprises: a processor and a communication interface;
the processor is configured to obtain a current position of a terminal, a moving speed of the terminal, and a moving route of the terminal, predict, according to the current position of the terminal, the moving speed of the terminal, and the moving route of the terminal, that the terminal will move to a position where timing advance adjustment is performed this time, estimate a time advance according to the position where timing advance adjustment is performed this time by the terminal, and send the time advance to the terminal through the communication interface, so that the time advance is applied when the terminal moves to the position where timing advance adjustment is performed this time, where the terminal will move to the position where timing advance adjustment is performed this time is predicted according to the current position of the terminal, the moving speed of the terminal, and the moving route of the terminal, and the processor includes: estimating the time required by the terminal to move from the current position to the position subjected to the timing advance adjustment at this time according to the current position of the terminal, the moving speed of the terminal and the moving route of the terminal; and under the condition that the estimated time required for the terminal to move from the current position to the position for performing the timing advance adjustment at this time is consistent with the preset time, predicting that the terminal will move to the position for performing the timing advance adjustment at this time, wherein the preset time is the sum of the time from the time when the terminal receives the timing advance command to the time when the timing advance command is applied and the time from the time advance estimated by the base station to the time when the terminal receives the time advance.
8. A storage medium, characterized in that the storage medium has stored thereon a program which, when executed by a processor, implements the time advance estimation method of any one of claims 1 to 3.
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| CN201810069380.2A CN110087191B (en) | 2018-01-24 | 2018-01-24 | Method and device for estimating time advance |
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| ATE324018T1 (en) * | 2003-12-18 | 2006-05-15 | Evolium Sas | METHOD FOR CALCULATING THE POSITION OF A MOBILE STATION IN A CELLULAR COMMUNICATIONS NETWORK |
| JP5029450B2 (en) * | 2008-03-21 | 2012-09-19 | 富士通株式会社 | Communication system and terminal device |
| GB2469444A (en) * | 2009-04-14 | 2010-10-20 | Vodafone Plc | Terminal positioning |
| CN103442362B (en) * | 2013-08-27 | 2017-02-08 | 东南大学 | Communication device and method for interference coordination and energy conservation with same adopted |
| CN104837160A (en) * | 2014-02-08 | 2015-08-12 | 普天信息技术研究院有限公司 | Uplink timing TA measuring method in distributed base station system |
| CN106793057A (en) * | 2016-12-30 | 2017-05-31 | 展讯通信（上海）有限公司 | Time advance for cellular network communication system determines method and device |
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