WO2018126756A1 - Information synchronization method and device - Google Patents

Abstract

Disclosed is an information synchronization method, comprising: transmitting first indication information to a terminal, the first indication information indicating the terminal to transmit first physical random access channel (PRACH) information at first time; receiving the first PRACH information transmitted by the terminal to obtain second time of receiving the first PRACH information; determining a first timing advance (TA) according to the first time and the second time; transmitting the first TA to the terminal so that the terminal transmits service information according to the first TA; and obtaining a movement speed of the terminal, and determining a second TA corresponding to the movement speed according to the movement speed. Also disclosed is an information synchronization device.

Description

Information synchronization method and device Technical field

The present application relates to the field of information communication, for example, to an information synchronization method and apparatus.

Background technique

With the development of the communication field, the Narrow Band Internet of Things (NB-IoT) system has become an important branch of the Internet of Everything with its advantages of low power consumption, wide coverage, low cost and large capacity. . In the NB-IoT system, in order for the base station to correctly decode the data transmitted by the terminal, the terminal and the base station need to maintain uplink synchronization to ensure that the signal of the terminal can fall accurately into the receiving time window of the base station, that is, within the cyclic prefix range. In order to accurately fall into the cyclic prefix of the base station, the terminal needs to adjust the time before transmitting the signal, and transmit according to the time point of the base station. This time adjustment value is the time advance (TA, Time Advance). The base station can control the time when the uplink signal sent by different terminals arrives at the base station by adjusting the TA value of each terminal. The farther the terminal is from the base station, the larger the transmission delay is, and the uplink data needs to be sent earlier than the terminal close to the base station. Therefore, the TA value is also larger. At the same time, since the terminal is often in motion, the time when the uplink signal arrives at the base station is also constantly changing. To ensure that the terminal signal can fall accurately into the receiving time window of the base station, the base station needs to continuously adjust the TA value to send data in advance to reach the uplink. Synchronize.

NB-IoT supports three uplink data transmission modes, such as Single-Tone 3.75KHz, Single-Tone 15KHz, and Multi-Tone 15KHz. Among them, Single-Tone refers to a single tone signal, that is, a single subcarrier mode, and Multi-Tone refers to a multi-tone signal, that is, a multi-subcarrier mode. The single subcarrier mode appears to improve the coverage capability, concentrate power to transmit at a frequency point, and improve the Signal to Interference plus Noise Ratio (SINR).

For the case of multiple resources such as multiple subcarriers, there are two commonly used TA adjustment methods. One is that the base station estimates the TA value by measuring the received Preamble (the preamble of the access channel) during the random access procedure. The other is to obtain the TA value by measuring the sounding reference signal (SRS, Sounding Reference Signal) or measuring the received uplink data physical uplink shared channel (PUSCH) during the service maintenance process. Frequency domain estimation method And time domain estimation method, wherein the frequency domain estimation method has a frequency domain phase difference estimation method, and common time domain estimation methods are: Sinc function Sinc (Sinc function) function interpolation method, Discrete Fourier transform (DFT, Discrete Fourier Transform) Interpolation method, center of gravity method, DFT interpolation + center of gravity method. For the case of a single subcarrier, since the effective resources are small, the TA estimation of the base station faces two difficulties of TA estimation difficulty and estimation of TA inaccuracy, which makes it difficult to maintain uplink synchronization.

Summary of the invention

The embodiments of the present disclosure provide an information synchronization method and apparatus. The base station determines an uplink time advance according to the mobility of the terminal, ensures the accuracy of the time advance of the mobile terminal, and improves the accuracy of the interaction between the base station and the terminal information in the single subcarrier mode. .

The technical solution of the present disclosure is implemented as follows:

An embodiment of the present disclosure provides an information synchronization method, where the method includes:

Sending the first indication information to the terminal, where the first indication information indicates that the terminal sends the first physical random access channel PRACH information at the first time;

Receiving the first PRACH information sent by the terminal, and obtaining a second time for receiving the first PRACH information;

Determining a first timing advance TA according to the first time and the second time;

Sending the first TA to the terminal, so that the terminal sends service information according to the first TA;

Obtaining a moving speed of the terminal, and determining a second TA corresponding to the moving speed according to the moving speed.

The determining, by the moving speed, the second TA corresponding to the moving speed may include:

When the moving speed is equal to 0, the second TA is the first TA;

When the moving speed is not equal to 0, the scheduling period corresponding to the moving speed is determined according to the correspondence between the pre-stored moving speed and the scheduling period, and the terminal is instructed to send the second PRACH information according to the scheduling period corresponding to the moving speed. Determining, according to the second PRACH information, the second TA.

The scheduling period corresponding to the moving speed instructs the terminal to send a second PRACH message Determining the second TA according to the second PRACH information may include:

Transmitting, according to the scheduling period corresponding to the moving speed, the second indication information, where the second indication information is used to indicate that the terminal sends the second PRACH information at the third time;

Receiving the second PRACH information sent by the terminal, obtaining a fourth time for receiving the second PRACH information, and determining the second TA according to the third time and the fourth time.

The determining, according to the pre-stored moving speed and the scheduling period, determining the scheduling period corresponding to the moving speed, may include:

And determining, in the correspondence between the pre-stored moving speed and the scheduling period, a moving speed range corresponding to the moving speed, and determining that the scheduling period corresponding to the moving speed range is a scheduling period corresponding to the moving speed.

The method may further include:

When the moving speed is equal to 0, the scheduling flag is set to 0;

When the moving speed is not equal to 0, the scheduling flag is set to 1.

The method may further include:

When it is detected that the uplink quality of the terminal meets the preset condition, the third indication information is sent to the terminal, where the third indication information indicates that the terminal sends the third PRACH information at the fifth time.

The obtaining the moving speed of the terminal may include:

Receiving status information sent by the terminal, where the status information carries a moving speed of the terminal;

Alternatively, measuring the motion state of the terminal to obtain the moving speed of the terminal.

An embodiment of the present disclosure provides an information synchronization method, where the method includes:

Receiving the first indication information, where the first indication information is used to indicate that the terminal sends the first PRACH information at the first time;

Sending the first PRACH information to the base station;

Receiving, by the first TA, the first TA, and sending the service information according to the first TA.

When detecting that the base station is out of synchronization, the fourth PRACH information may be sent to the base station.

After receiving the first TA sent by the base station, after sending the service information according to the first TA, Can include:

Receiving, by the base station, second indication information, where the second indication information indicates that the second PRACH information is sent at a third time;

Sending the second PRACH information to the base station.

An embodiment of the present disclosure provides an information synchronization apparatus, where the apparatus includes: a first receiving module, an obtaining module, a determining module, and a first sending module;

The first sending module is configured to send the first indication information to the terminal, where the first indication information indicates that the terminal sends the first physical random access channel PRACH information at the first time;

The first receiving module is configured to receive first PRACH information sent by the terminal;

The acquiring module is configured to obtain a second time for receiving the first PRACH information;

The determining module is configured to determine a first timing advance TA according to the first time and the second time;

The first sending module is configured to send the first TA to the terminal, so that the terminal sends service information according to the first TA;

The obtaining module is further configured to acquire a moving speed of the terminal;

The determining module is further configured to determine a second TA corresponding to the moving speed according to the moving speed.

When the moving speed is equal to 0, the second TA may be the first TA;

The determining module is configured to: when the moving speed is not equal to 0, determine a scheduling period corresponding to the moving speed according to a pre-stored moving speed and a scheduling period correspondence relationship;

The first sending module is configured to instruct the terminal to send the second PRACH information according to a scheduling period corresponding to the moving speed;

The determining module is configured to determine the second TA according to the second PRACH information.

The first sending module may be configured to send the second indication information according to the scheduling period corresponding to the moving speed, where the second indication information is used to indicate that the terminal sends the second PRACH information at the third time;

The first receiving module is configured to receive the second PRACH information sent by the terminal;

The acquiring module is configured to obtain a fourth time for receiving the second PRACH information;

The determining module is configured to determine the second TA according to the third time and the fourth time.

The determining module may be configured to search for a moving speed range corresponding to the moving speed in the pre-stored moving speed and scheduling period correspondence, and determine that the scheduling period corresponding to the moving speed range is the moving The scheduling period corresponding to the speed.

The device may further include: a setting module,

The setting module is configured to set a scheduling flag to 0 when the moving speed is equal to 0; and to be configured to set a scheduling flag to 1 when the moving speed is not equal to zero.

The first sending module may be configured to: when it is detected that the uplink quality of the terminal meets the preset condition, send the third indication information to the terminal, where the third indication information indicates that the terminal is in the fifth time Send the third PRACH information.

The first receiving module may be configured to receive status information sent by the terminal, where the status information carries a moving speed of the terminal;

Alternatively, the acquiring module is configured to measure a motion state of the terminal, and obtain a moving speed of the terminal.

An embodiment of the present disclosure provides an information synchronization apparatus, where the apparatus includes: a second receiving module, and a second sending module,

The second receiving module is configured to receive the first indication information, where the first indication information is used to indicate that the terminal sends the first PRACH information at the first time;

The second sending module is configured to send the first PRACH information to the base station;

The second receiving module is configured to receive the first TA sent by the base station, and send the service information according to the first TA.

The second sending module may be configured to send fourth PRACH information to the base station when detecting that the base station is out of synchronization.

The second receiving module may be configured to receive second indication information sent by the base station, where the second indication information indicates that the second PRACH information is sent at a third time;

The second sending module is configured to send the second PRACH information to the base station.

Embodiments of the present disclosure also provide a computer readable storage medium storing computer executable instructions arranged to perform the above method.

An embodiment of the present disclosure further provides an electronic device, including:

At least one processor;

a memory communicatively coupled to the at least one processor; wherein

The memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to perform the method described above.

An embodiment of the present disclosure provides an information synchronization method and apparatus. The base station instructs the terminal to send the PRACH information, and determines the uplink time advancement amount of the terminal by recording the time when the terminal instructs the terminal to send the PRACH information and the time of receiving the PRACH information sent by the terminal. At the same time, according to the mobile situation of the terminal, the base station periodically sends an indication to the mobile terminal, instructs the terminal to send the PRACH information, and determines a new uplink time advance quantity, so as to ensure the accuracy of the time advance of the mobile terminal, and ensure the single subcarrier mode. The accuracy of the interaction between the base station and the terminal information.

BRIEF abstract

FIG. 1 is a schematic flowchart 1 of an information synchronization method according to an embodiment of the present disclosure;

2 is a schematic diagram of a method for acquiring a timing advance according to an embodiment of the present disclosure;

FIG. 3 is a second schematic flowchart of an information synchronization method according to an embodiment of the present disclosure;

FIG. 4 is an information flow diagram of an information synchronization method according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram 1 of an information synchronization apparatus according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram 2 of an information synchronization apparatus according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram 3 of an information synchronization apparatus according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure.

detailed description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure.

Embodiment 1

An embodiment of the present disclosure provides an information synchronization method. As shown in FIG. 1, the method includes:

The execution body of the information synchronization method provided by the embodiment of the present disclosure is an information synchronization device, and the information synchronization device may be a base station. The base station and the terminal need to perform information interaction. The terminal refers to a device in the network that is at the outermost periphery of the network, and can be used for inputting user information and outputting processing results. The terminal in this embodiment may be a mobile phone, a computer, or the like.

As shown in FIG. 2, the first row in the figure indicates the base station transmission timing, which is composed of subframe 0, subframe 1, subframe 2, and subframe 3. The base station of each subframe is known; when the terminal and the base station complete synchronization, the terminal There will be corresponding receiving timings. As shown in the second row of the figure, the receiving timing of the terminal also includes subframe 0, subframe 1, subframe 2, and subframe 3 corresponding to the base station transmission timing. Due to environmental factors and other factors, the terminal generates a downlink transmission delay τ when it synchronizes with the base station. The base station sends the first indication information to indicate that the terminal sends the first PRACH (Physical Random Access Channel) information at the beginning of the third subframe, where the PRACH information is the first physical random access channel information.

Step 102: Receive the first PRACH information sent by the terminal, and obtain a second time for receiving the first PRACH information.

As shown in FIG. 2, after the terminal responds to the first indication information of the base station, the base station receives the first PRACH information sent by the terminal, and the fourth line in the figure indicates that the time for receiving the first PRACH information is the second time.

Step 103: Determine a first timing advance TA according to the first time and the second time.

As shown in FIG. 2, the base station sends the first indication information to the terminal to indicate that the terminal sends the first PRACH information at the start time of the third subframe as the first time, and the second time is that the base station receives the first PRACH information sent by the terminal. Time, there is an uplink transmission delay τ when the terminal transmits to the base station. Therefore, when the terminal sends a message to the base station, it needs to advance 2τ in advance to achieve time synchronization between the terminal and the base station. The first time advance amount TA for transmitting information to the terminal is from the first time to the second time.

Step 104: Send the first TA to the terminal, so that the terminal is according to the first TA. Send business information.

The base station sends the first TA to the terminal, and the terminal adjusts the time for sending the service information according to the first TA. Through the time adjustment, it is ensured that the signal of the terminal can fall accurately into the cyclic prefix range of the base station.

Step 105: Receive status information sent by the terminal, where the status information carries a moving speed of the terminal; or measure a motion state of the terminal to obtain a moving speed of the terminal.

Since the state of the terminal may be in a stationary state, it may be in a moving state. The speed of the terminal moving speed can be detected by the terminal itself and then reported to the base station or the base station by means of wireless signal detection. When the terminal is equipped with a device having a speed measuring function such as a GPS or a gyroscope, the terminal can detect its own moving speed and report it to the base station. When the terminal does not have the speed measuring function or does not report the moving speed, the base station may initiate the detection. Two methods of measuring the speed of the terminal can be used in parallel. When the terminal is in the mobile state, the TA must be changed to ensure the uplink synchronization of the terminal. When the terminal moving speed is equal to 0, step 106 is performed; when the terminal moving speed is not equal to 0, step 107 is performed.

Step 106: When the moving speed is equal to 0, the second TA is the first TA.

When the moving speed of the terminal is 0, that is, when the terminal is in a stationary state, the distance from the terminal to the base station does not change, so the terminal keeps using the first TA to transmit data to achieve uplink synchronization.

Step 107: When the moving speed is not equal to 0, determine a scheduling period corresponding to the moving speed according to a pre-stored moving speed and a scheduling period, and instruct the terminal to send according to a scheduling period corresponding to the moving speed. The second PRACH information determines the second TA according to the second PRACH information.

The determining the scheduling period corresponding to the moving speed may include: searching a moving speed range corresponding to the moving speed in a pre-stored moving speed and a scheduling period according to a pre-stored moving speed and a scheduling period, and determining The scheduling period corresponding to the moving speed range is a scheduling period corresponding to the moving speed.

The information synchronization device pre-stores the correspondence between the terminal movement speed and the period in which the scheduling terminal transmits the PRACH information. By acquiring the moving speed of the terminal, the scheduling period of the base station can be determined.

Exemplarily, when the moving speed of the terminal is 0 to 60 km/h, the scheduling period of the base station is 1280 ms; when the moving speed of the terminal is greater than 60 km/h, the scheduling period of the base station is 320 ms. The interval of the terminal moving speed and the corresponding period provided in this embodiment may be set as needed according to environmental factors, equipment specifications, and the like. The present embodiment does not limit the speed interval division and the cycle size. The higher the moving speed of the terminal is, the shorter the scheduling period of the base station is, and the moving speed of the terminal is divided into different intervals, and each interval corresponds to a scheduling period of one base station.

The scheduling period corresponding to the moving speed indicates that the terminal sends the second PRACH information at the third time, and determining the second TA according to the second PRACH information may include:

Transmitting, according to the scheduling period corresponding to the moving speed, the second indication information, where the second indication information is used to indicate that the terminal sends the second PRACH information at the third time, and receives the second PRACH information sent by the terminal, to obtain The fourth time of receiving the second PRACH information determines the second TA according to the third time and the fourth time.

According to the scheduling period corresponding to the moving speed, the base station periodically sends scheduling information to indicate that the terminal sends the second PRACH information at the third time, and the time that the base station receives the second PRACH information sent by the terminal is the fourth time, the fourth time, and the The difference between the three times is the second TA.

When it is detected that the uplink quality of the terminal meets the preset condition, the third indication information may be sent to the terminal, and the time for sending the third indication information is determined, where the third indication information indicates that the terminal is in the fifth Time sends the third PRACH information.

The foregoing preset condition refers to a preset condition that the terminal uplink quality is poor. The uplink quality of the terminal can be determined according to information such as a block error rate (BLER), a bit error rate (BER), and a signal to interference ratio (SIR), when the block error rate is less than 0.1. When the signal-to-interference ratio is less than -3 db, it can be judged that the uplink quality of the terminal is poor. The condition that the uplink quality is poor is the common knowledge of the communication. This embodiment is only an example, and the uplink quality judgment standard is not limited. The preset condition that the uplink quality is satisfied is pre-stored in the information synchronizing device. When the uplink quality difference of the terminal is detected, the base station is not restricted by the periodic transmission indication, and immediately sends the third indication information to the terminal, instructing the terminal to send the PRACH information, and correcting the TA time. The process of obtaining the calibration time is the same as the process of acquiring the first TA time, and will not be described again. After the TA is corrected, the period of sending the indication information is determined according to the moving speed of the terminal, and the indication information indicates that the terminal sends the PRACH information.

After the base station obtains the moving speed of the terminal, the method for periodically scheduling the terminal to send the PRACH information correction TA according to the speed may further include:

When the moving speed is equal to 0, the scheduling flag is set to 0; when the moving speed is not equal to 0, the scheduling flag is set to 1.

When the moving speed of the terminal is equal to 0, that is, the terminal is in a static state, the scheduling identifier is set to 0, wherein the scheduling identifier is located in the scheduling program of the information synchronization device. When the scheduling identifier is 0, the terminal is not scheduled periodically, and the terminal continues to use the current TA.

When the moving speed of the terminal is not equal to 0, that is, the terminal is in the mobile state, the scheduling identifier is set to 1, the terminal is periodically scheduled, and the period acquired for the first time in the process is maintained until the base station detects that the terminal has poor uplink quality. When the terminal is instructed to send the PRACH information, the corresponding scheduling period is determined according to the new terminal moving speed.

Exemplarily, the relationship between the moving speed of the terminal pre-stored in the information synchronization device and the scheduling period of the base station is: when the moving speed of the terminal is greater than 0 and less than or equal to 30 km/h, the scheduling period of the base station is 2000 ms; when the terminal moves When the speed is greater than 30km/h and less than or equal to 60km/h, the scheduling period of the base station is 1000ms; when the moving speed of the terminal is greater than 60km/h and less than or equal to 100km/h, the scheduling period of the base station is 300ms.

The base station obtains the first moving speed of the terminal for the first time, and obtains that the first moving speed of the terminal is 20 km/h, and sets the scheduling identifier to 1, and the scheduling period is 2000 ms, and instructs the terminal to send the PRACH information to correct the TA every 2000 ms, and The speed of the terminal is no longer acquired. After the base station detects that the uplink quality of the terminal meets the preset condition or the terminal detects the uplink out-of-synchronization, the second moving speed of the terminal is acquired, the second moving speed of the terminal is 50 km/h, and the change scheduling period is 1000 ms, and the terminal is sent every 1000 ms. The PRACH information is corrected for the TA, and the moving speed of the terminal is not acquired. Until the base station detects that the uplink quality of the terminal meets the preset condition or the terminal detects the uplink out-of-synchronization, the mobile terminal speed is acquired again, and the period is corrected. When the scheduling period of the base station reaches the minimum value, the scheduling period does not change again, and the minimum scheduling period is maintained, that is, 300 ms sends a scheduling instruction to the terminal.

The information synchronization method provided by the embodiment of the present disclosure, the base station notifies the terminal to transmit the PRACH information, records the time when the terminal sends the PRACH information, and receives the PRACH information time sent by the terminal, determines the uplink time advance of the terminal, and according to the mobile terminal. In the case, the base station periodically sends an indication to the mobile terminal, instructing the terminal to send the PRACH information, and determining a new uplink timing advance to ensure the accuracy of the time advance of the mobile terminal, and ensuring the interaction between the base station and the terminal in the single subcarrier mode. The accuracy.

Embodiment 2

An embodiment of the present disclosure provides an information synchronization method. As shown in FIG. 3, the method includes:

Step 201: Receive first indication information, where the first indication information is used to indicate that the terminal sends the first PRACH information at the first time.

The execution body of the information synchronization method provided by the embodiment of the present disclosure is an information synchronization device, and the information synchronization device may be a terminal. The base station and the terminal perform information exchange, wherein the terminal refers to a device in the network that is at the outermost periphery of the network, and can be used for inputting user information and outputting the processing result. The terminal in this embodiment may be a mobile phone, a computer, or the like.

After the terminal performs downlink locking on the base station, the terminal receives the first indication information of the base station, where the first indication information is used to indicate that the terminal sends the first PRACH information at the first time.

Step 202: Send the first PRACH information to the base station.

Step 203: Receive a first TA sent by the base station, and send service information according to the first TA.

The terminal receives the first TA sent by the base station, and sends service information to the base station on the traffic channel of the single subcarrier mode, and performs multiple services. Adjust the time when the service information is sent according to the first TA value.

Optionally, when the moving speed of the terminal is not 0, step 204 is performed.

Step 204: Receive second indication information sent by the base station, where the second indication information indicates that the second PRACH information is sent at a third time, and the second PRACH information is sent to the base station.

When the terminal receives the second indication information sent by the base station, and indicates that the second PRACH information is sent, the terminal sends the second PRACH information to the base station, and continues to use the first TA to send the information before receiving the new TA sent by the base station. Correction.

When detecting that the base station is out of synchronization, the fourth PRACH information may be sent to the base station.

In the process of the service interaction between the terminal and the base station, once the terminal detects that the base station is out of synchronization, the terminal immediately sends the fourth PRACH information to the base station, and requests the base station to adjust the TA to ensure the communication quality.

The information synchronization method provided by the embodiment of the present disclosure sends a PRACH message by receiving a command for transmitting the PRACH information sent by the base station, acquires a time advance amount sent by the base station, and performs time correction on the sent service information to achieve uplink synchronization. At the same time, when the terminal has the speed measuring capability, the mobile station reports the mobile information to the base station to assist the base station to periodically adjust the time advance of the moving terminal. The accuracy of terminal and base station information transmission in single subcarrier mode is guaranteed.

Embodiment 3

An embodiment of the present disclosure provides an information synchronization method, and FIG. 4 is a flowchart of the information synchronization method. The method is as follows:

Step 301: The terminal receives the first indication information.

After the terminal sends a request for the connection to the base station, the base station receives the request, and sends the first indication information to the terminal, where the first indication information indicates that the terminal sends the first PRACH information at the first time. The terminal receives the first indication information.

Step 302: The terminal sends the first PRACH information to the base station.

After receiving the first indication information, the terminal sends the first PRACH information to the base station at the first time according to the first indication information. The base station receives the first PRACH information sent by the terminal, and obtains a second time for receiving the first PRACH information.

Step 303: The base station determines the first timing advance TA according to the first time and the second time.

The first indication information indicates that the terminal sends the first PRACH information at the first time, and the base station sends a message delay time to the terminal from the second time to the first time, where the delay time is the first time advance amount TA.

Step 304: The base station sends the first TA to the terminal, so that the terminal sends service information according to the first TA.

Step 305: The terminal receives the first TA sent by the base station, and sends service information according to the first TA.

The terminal receives the first TA sent by the base station, and sends service information according to the first TA. Through the time adjustment, it is ensured that the signal of the terminal can fall accurately into the cyclic prefix range of the base station.

Step 306: The base station receives the state information sent by the terminal, where the state information carries the moving speed of the terminal; or the base station measures the motion state of the terminal to obtain the moving speed of the terminal.

Since the state of the terminal may be in a stationary state, it may be in a moving state. The speed of the terminal moving speed can be detected by the terminal itself and then reported to the base station or the base station by means of wireless signal detection. When the terminal is equipped with a device having a speed measuring function such as a GPS or a gyroscope, the terminal can detect its own moving speed and report it to the base station. When the terminal does not have the speed measuring function or does not report the moving speed, the base station may initiate the detection. Two methods of measuring the speed of the terminal can be used in parallel. When the terminal is in the mobile state, the TA must be changed to ensure the uplink synchronization of the terminal. When the terminal moving speed is equal to 0, that is, when the terminal is in a stationary state, the distance from the terminal to the base station does not change, so The terminal keeps using the first TA to send data to achieve uplink synchronization; when the terminal moves speed is not equal to 0, step 307 is performed.

Step 307: The base station sends the second indication information according to the scheduling period corresponding to the moving speed, where the second indication information is used to instruct the terminal to send the second PRACH information at the third time.

The correspondence between the terminal moving speed and the period in which the scheduling terminal transmits the PRACH information is pre-stored in the base station. By acquiring the moving speed of the terminal, the scheduling period of the base station can be determined. The scheduling period corresponding to the moving speed is determined according to a correspondence between a pre-stored moving speed and a scheduling period. The method may include: searching a moving speed range corresponding to the moving speed in a pre-stored moving speed and a scheduling period, and determining that the scheduling period corresponding to the moving speed range is a scheduling period corresponding to the moving speed. The second indication information is used to indicate that the terminal sends the second PRACH information at the third time.

Step 308: The terminal sends the second PRACH information to the base station.

Step 309: The base station receives the second PRACH information sent by the terminal, obtains a fourth time for receiving the second PRACH information, and determines the second TA according to the third time and the fourth time.

The second indication information indicates that the terminal sends the second PRACH information at the third time, and the time when the base station receives the second PRACH information sent by the terminal is the fourth time, and the fourth time minus the third time is the second TA.

Step 310: The base station sends the second TA to the terminal, so that the terminal sends service information according to the first TA.

Step 311: The terminal receives the second TA sent by the base station, and sends service information according to the second TA.

The base station periodically instructs the terminal to send the PRACH information correction time advance amount according to the obtained scheduling period corresponding to the terminal moving speed, that is, periodically performs steps 306 to 311 to complete the determination of the time advance amount for the mobile terminal.

Specifically, in the process of step 301 to step 311, if the base station detects that the uplink quality of the terminal meets the preset condition, step 312 is performed immediately; if the terminal detects that the base station is out of synchronization, step 313 is performed immediately.

Step 312: When the base station detects that the uplink quality of the terminal meets a preset condition, sending the third finger And displaying the information to the terminal, where the third indication information indicates that the terminal sends the third PRACH information at the fifth time.

The foregoing preset condition refers to a preset condition that the terminal uplink quality is poor. The uplink quality of the terminal can be determined according to information such as a block error rate (BLER), a bit error rate (BER), a signal to interference ratio (SIR), and a preset condition for satisfying the uplink quality. Pre-stored in the information synchronization device. When the base station monitors the uplink quality difference of the terminal, the base station is not restricted by the periodic transmission indication, and immediately sends the third indication information to the terminal, instructing the terminal to send the PRACH information at the fifth time, and correct the TA time. The process of obtaining the calibration time is the same as the process of obtaining the first TA time in steps 301 to 305, and details are not described herein again. After the TA is corrected, the period of sending the indication information is determined according to the moving speed of the terminal, and the indication information indicates that the terminal sends the PRACH information.

Step 313: When the terminal detects that the base station is out of synchronization, the terminal sends the fourth PRACH information to the base station.

In the process of the service interaction between the terminal and the base station, once the terminal detects that the base station is out of synchronization, the terminal immediately sends the fourth PRACH information to the base station, and requests the base station to adjust the TA to ensure the communication quality.

For steps 312 and 313, the terminal still transmits the service information on the PUSCH channel using the latest TA that has been obtained before the terminal does not obtain a new TA.

In the information synchronization method provided by the embodiment of the present disclosure, the base station instructs the terminal to send the PRACH information, and determines the uplink time advancement amount of the terminal by recording the time indicating that the terminal sends the PRACH information and the time of receiving the PRACH information sent by the terminal. At the same time, according to the mobile situation of the terminal, the base station periodically sends an indication to the mobile terminal, instructs the terminal to send the PRACH information, and determines a new uplink time advance quantity, so as to ensure the accuracy of the time advance of the mobile terminal, and ensure the single subcarrier mode. The accuracy of the interaction between the base station and the terminal information.

Embodiment 4

An embodiment of the present disclosure provides an information synchronization apparatus 1. As shown in FIG. 5, the apparatus includes: a first receiving module 10, an obtaining module 11, a determining module 12, and a first sending module 13;

The first sending module 13 is configured to send the first indication information to the terminal, where the first indication information indicates that the terminal sends the first physical random access channel PRACH information at the first time;

The first receiving module 10 is configured to receive the first PRACH information sent by the terminal;

The obtaining module 11 is configured to obtain a second time for receiving the first PRACH information;

The determining module 12 is configured to determine a first timing advance TA according to the first time and the second time;

The first sending module 13 is configured to send the first TA to the terminal, so that the terminal sends service information according to the first TA;

The obtaining module 11 is further configured to acquire a moving speed of the terminal;

The determining module 12 is further configured to determine a second TA corresponding to the moving speed according to the moving speed.

When the moving speed is equal to 0, the second TA may be the first TA;

The determining module 12 is configured to: when the moving speed is not equal to 0, determine a scheduling period corresponding to the moving speed according to a pre-stored moving speed and a scheduling period correspondence relationship;

The first sending module 13 is configured to instruct the terminal to send the second PRACH information according to a scheduling period corresponding to the moving speed;

The determining module 12 is configured to determine the second TA according to the second PRACH information.

The first sending module 13 may be configured to send the second indication information according to the scheduling period corresponding to the moving speed, where the second indication information is used to indicate that the terminal sends the second PRACH information at the third time;

The first receiving module 10 is configured to receive the second PRACH information sent by the terminal;

The obtaining module 11 is configured to obtain a fourth time for receiving the second PRACH information;

The determining module 12 is configured to determine the second TA according to the third time and the fourth time.

The determining module 12 may be configured to search for a moving speed range corresponding to the moving speed in the pre-stored moving speed and scheduling period correspondence, and determine that the scheduling period corresponding to the moving speed range is the The scheduling period corresponding to the moving speed.

As shown in FIG. 6, the device may further include: a setting module 14,

The setting module 14 is configured to set a scheduling flag to 0 when the moving speed is equal to 0, and is further configured to set a scheduling flag to 1 when the moving speed is not equal to zero.

The first sending module 13 may be configured to: when it is detected that the uplink quality of the terminal meets a preset condition, send the third indication information to the terminal, where the third indication information indicates that the terminal is in the fifth Time sends the third PRACH information.

The first receiving module 10 may be configured to receive status information sent by the terminal, where the status information carries a moving speed of the terminal;

Alternatively, the obtaining module 11 is configured to measure a motion state of the terminal to obtain a moving speed of the terminal.

For the understanding of the information synchronization device provided by the embodiment of the present disclosure, reference may be made to the description of the information synchronization method in the first embodiment to the third embodiment, and details are not described herein again.

The information synchronization apparatus provided by the embodiment of the present disclosure indicates that the terminal sends the PRACH information, and determines the uplink timing advance of the terminal by recording the time when the terminal instructs the terminal to send the PRACH information and the time of receiving the PRACH information sent by the terminal. At the same time, according to the mobile situation of the terminal, the mobile terminal periodically sends an indication to the terminal to send the PRACH information to ensure the accuracy of the time advance of the mobile terminal. The accuracy of the interaction between the base station and the terminal information in the single subcarrier mode is guaranteed.

Embodiment 5

The embodiment of the present disclosure provides an information synchronization device 2, as shown in FIG. 7, the device includes: a second receiving module 20, and a second sending module 21,

The second receiving module 20 is configured to receive first indication information, where the first indication information is used to indicate that the terminal sends the first PRACH information at the first time;

The second sending module 21 is configured to send the first PRACH information to the base station;

The second receiving module 20 is configured to receive the first TA sent by the base station, and send the service information according to the first TA.

The second sending module 21 may be configured to send fourth PRACH information to the base station when detecting that the base station is out of synchronization.

The second receiving module 20 may be configured to receive second indication information sent by the base station, where the second indication information indicates that the second PRACH information is sent at a third time;

The second sending module 21 is configured to send the second PRACH information to the base station.

For the understanding of the information synchronization device provided by the embodiment of the present disclosure, reference may be made to the description of the information synchronization method in the first embodiment to the third embodiment, and details are not described herein again.

Embodiments of the present disclosure also provide a computer readable storage medium storing computer executable instructions arranged to perform the method of any of the above embodiments.

The computer readable storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

The embodiment of the present disclosure further provides a schematic structural diagram of an electronic device. Referring to FIG. 8, the electronic device includes:

At least one processor 80, which is exemplified by a processor 80 in FIG. 8; and a memory 81, may further include a communication interface 82 and a bus 83. The processor 80, the communication interface 82, and the memory 81 can complete communication with each other through the bus 83. Communication interface 82 can be used for information transmission. Processor 80 can invoke logic instructions in memory 81 to perform the methods of the above-described embodiments.

In addition, the logic instructions in the memory 81 described above may be implemented in the form of a software functional unit and sold or used as a stand-alone product, and may be stored in a computer readable storage medium.

The memory 81 is used as a computer readable storage medium for storing software programs, computer executable programs, and program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 80 executes the function application and the data processing by executing software programs, instructions, and modules stored in the memory 81, that is, implementing the information synchronization method in the above method embodiments.

The memory 81 may include a storage program area and an storage data area, wherein the storage program area may store an operating system, an application required for at least one function; the storage data area may store data created according to use of the terminal device, and the like. Further, the memory 81 may include a high speed random access memory, and may also include a nonvolatile memory.

The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product stored in a storage medium, including one or more instructions for causing a computer device (which may be a personal computer, a server, or a network) The device or the like) performs all or part of the steps of the method described in the embodiments of the present disclosure. The foregoing storage medium may be a non-transitory storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like. A medium that can store program code, or a transitory storage medium.

The information synchronization apparatus provided by the embodiment of the present disclosure indicates that the terminal sends the PRACH information, and determines the uplink timing advance of the terminal by recording the time when the terminal instructs the terminal to send the PRACH information and the time of receiving the PRACH information sent by the terminal. At the same time, according to the mobile situation of the terminal, the mobile terminal periodically sends an indication to the terminal to send the PRACH information to ensure the accuracy of the time advance of the mobile terminal. The accuracy of the interaction between the base station and the terminal information in the single subcarrier mode is guaranteed.

Those skilled in the art will appreciate that embodiments of the present disclosure can be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware aspects. Moreover, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present disclosure. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that instructions generated by a processor of a computer or other programmable data processing device are Means configured to implement the functions specified in one or more flows of the flowchart or in a block or blocks of the flowchart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that A series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing such that instructions executed on a computer or other programmable device are provided for implementing one or more processes and/or block diagrams in the flowchart The steps of a function specified in a box or multiple boxes.

The above description is only for the embodiments of the present disclosure, and is not intended to limit the scope of the disclosure.

Industrial applicability

The information synchronization method and apparatus disclosed in the present application ensure the accuracy of the time advance of the mobile terminal, and improve the accuracy of the information exchange between the base station and the terminal in the single subcarrier mode.

Claims (21)

An information synchronization method includes: Sending the first indication information to the terminal, where the first indication information indicates that the terminal sends the first physical random access channel PRACH information at the first time; Receiving the first PRACH information sent by the terminal, and obtaining a second time for receiving the first PRACH information; Determining a first timing advance TA according to the first time and the second time; Sending the first TA to the terminal, so that the terminal sends service information according to the first TA; Obtaining a moving speed of the terminal, and determining a second TA corresponding to the moving speed according to the moving speed. The method of claim 1, wherein the determining the second TA corresponding to the moving speed according to the moving speed comprises: When the moving speed is equal to 0, the second TA is the first TA; When the moving speed is not equal to 0, the scheduling period corresponding to the moving speed is determined according to the correspondence between the pre-stored moving speed and the scheduling period, and the terminal is instructed to send the second PRACH information according to the scheduling period corresponding to the moving speed. Determining, according to the second PRACH information, the second TA. The method according to claim 2, wherein the scheduling period corresponding to the moving speed indicates that the terminal sends the second PRACH information, and determining the second TA according to the second PRACH information includes: Transmitting, according to the scheduling period corresponding to the moving speed, the second indication information, where the second indication information is used to indicate that the terminal sends the second PRACH information at the third time; Receiving the second PRACH information sent by the terminal, obtaining a fourth time for receiving the second PRACH information, and determining the second TA according to the third time and the fourth time. The method according to claim 2, wherein the determining a scheduling period corresponding to the moving speed according to a pre-stored moving speed and a scheduling period correspondence, comprising: And determining, in the correspondence between the pre-stored moving speed and the scheduling period, a moving speed range corresponding to the moving speed, and determining that the scheduling period corresponding to the moving speed range is a scheduling period corresponding to the moving speed. The method of claim 2 further comprising: When the moving speed is equal to 0, the scheduling flag is set to 0; When the moving speed is not equal to 0, the scheduling flag is set to 1. The method of claim 1 further comprising: When it is detected that the uplink quality of the terminal meets the preset condition, the third indication information is sent to the terminal, where the third indication information indicates that the terminal sends the third PRACH information at the fifth time. The method according to any one of claims 1 to 6, wherein the obtaining the moving speed of the terminal comprises: Receiving status information sent by the terminal, where the status information carries a moving speed of the terminal; Alternatively, measuring the motion state of the terminal to obtain the moving speed of the terminal. An information synchronization method includes: Receiving the first indication information, where the first indication information is used to indicate that the terminal sends the first PRACH information at the first time; Sending the first PRACH information to the base station; Receiving, by the first TA, the first TA, and sending the service information according to the first TA. The method of claim 8 further comprising: When detecting that the base station is out of synchronization, transmitting fourth PRACH information to the base station. The method according to claim 8, wherein after receiving the first TA sent by the base station and transmitting the service information according to the first TA, the method includes: Receiving, by the base station, second indication information, where the second indication information indicates that the second PRACH information is sent at a third time; Sending the second PRACH information to the base station. An information synchronization device includes: a first receiving module, an obtaining module, a determining module, and a first sending module; wherein The first sending module is configured to send the first indication information to the terminal, where the first indication information indicates that the terminal sends the first physical random access channel PRACH information at the first time; The first receiving module is configured to receive first PRACH information sent by the terminal; The acquiring module is configured to obtain a second time for receiving the first PRACH information; The determining module is configured to determine a first timing advance TA according to the first time and the second time; The first sending module is configured to send the first TA to the terminal, so that the terminal sends service information according to the first TA; The obtaining module is further configured to acquire a moving speed of the terminal; The determining module is further configured to determine a second TA corresponding to the moving speed according to the moving speed. The apparatus according to claim 11, wherein When the moving speed is equal to 0, the second TA is the first TA; The determining module is configured to: when the moving speed is not equal to 0, determine a scheduling period corresponding to the moving speed according to a pre-stored moving speed and a scheduling period correspondence relationship; The first sending module is configured to instruct the terminal to send the second PRACH information according to a scheduling period corresponding to the moving speed; The determining module is configured to determine the second TA according to the second PRACH information. The device according to claim 12, wherein The first sending module is configured to send the second indication information according to the scheduling period corresponding to the moving speed, where the second indication information is used to indicate that the terminal sends the second PRACH information at the third time; The first receiving module is configured to receive the second PRACH information sent by the terminal; The acquiring module is configured to obtain a fourth time for receiving the second PRACH information; The determining module is configured to determine the second TA according to the third time and the fourth time. The device according to claim 12, wherein The determining module is configured to search for a moving speed range corresponding to the moving speed in the pre-stored moving speed and scheduling period correspondence, and determine that the scheduling period corresponding to the moving speed range is the moving speed The corresponding scheduling period. The apparatus of claim 12, further comprising: a setting module, The setting module is configured to set a scheduling flag to 0 when the moving speed is equal to 0; and to be configured to set a scheduling flag to 1 when the moving speed is not equal to zero. The apparatus according to claim 11, wherein The first sending module is configured to: when it is detected that the uplink quality of the terminal meets the preset condition, send the third indication information to the terminal, where the third indication information indicates that the terminal is in the fifth time The third PRACH information is sent. A device according to any one of claims 11 to 16, wherein The first receiving module is configured to receive status information sent by the terminal, where the status information carries a moving speed of the terminal; Alternatively, the acquiring module is configured to measure a motion state of the terminal, and obtain a moving speed of the terminal. An information synchronization device includes: a second receiving module and a second sending module, The second receiving module is configured to receive the first indication information, where the first indication information is used to indicate that the terminal sends the first PRACH information at the first time; The second sending module is configured to send the first PRACH information to the base station; The second receiving module is configured to receive the first TA sent by the base station, and send the service information according to the first TA. The device according to claim 18, wherein The second sending module is configured to send fourth PRACH information to the base station when detecting that the base station is out of synchronization. The device according to claim 18, wherein The second receiving module is configured to receive second indication information sent by the base station, where the second indication information indicates that the second PRACH information is sent at a third time; The second sending module is configured to send the second PRACH information to the base station. A computer readable storage medium storing computer executable instructions arranged to perform the method of any one of claims 1-7 or 8-10.

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