CN117545062A - Methods, systems and related equipment for time alignment in wireless communications - Google Patents

Abstract

The present application relates to a method, system and related equipment for time alignment in wireless communications, which are applied in the field of communication technology. The method includes: obtaining a time offset sent by a base station. The time offset is obtained by the base station. The registration request frame sent by the terminal; obtained by frame synchronization based on the registration request frame; data is sent to the base station based on the time offset. This is to solve the problem in the existing technology that decoding errors occur due to time deviation, which affects the safe operation of power facilities.

Description

Methods, systems and related equipment for time alignment in wireless communications

Technical field

The present application relates to the field of communication technology, and in particular, to a method, system and related equipment for time alignment in wireless communication.

Background technique

At present, the power private network wireless communication system uses the EPDT protocol, which requires the use of encrypted communication to ensure the security of power wireless transmission. Usually, encrypted communication uses data in the same time slot between the base station and the terminal to encrypt and decrypt data to ensure data security.

However, when the crystal oscillators of the base station and the terminal are offset, if the time cannot be aligned, the base station may not be able to receive the content sent by the terminal normally, or the decoding error may occur due to the time deviation after receipt, seriously affecting the power facilities. safe operation.

Contents of the invention

This application provides a time alignment method, system and related equipment in wireless communication to solve the problem in the existing technology that decoding errors are caused by time deviations and affect the safe operation of power facilities.

In the first aspect, embodiments of the present application provide a time alignment method in wireless communication, which is applied to terminals and includes:

Obtain the time offset sent by the base station, which is obtained by the base station by obtaining the registration request frame sent by the terminal; performing frame synchronization based on the registration request frame;

Data is sent to the base station based on the time offset.

Optionally, sending data to the base station based on the time offset includes:

Determine whether there is a positioning module in itself;

If present, send data to the base station in advance of the time offset;

If it does not exist, data is sent to the base station two times in advance by the time offset.

Optionally, after sending data to the base station based on the time offset, the method further includes:

The offset time of the terminal is adjusted so that the terminal is time aligned with the base station.

Optionally, the adjustment of the offset time of the terminal includes:

When there is a positioning module in the terminal, the current time is obtained and judged whether the current time reaches the reset update period; if so, the current frame is adjusted to the preset time slot and the preset intra-frame number, and the positioning module is used to issue per second Points, the reset update cycle includes a preset number of points per second;

When the positioning module does not exist in the terminal, the time slot of the terminal is advanced by two of the time offsets.

In the second aspect, embodiments of the present application provide a method for time alignment in wireless communication, which is applied to base stations, including:

Get the registration request frame sent by the terminal;

Perform frame synchronization based on the registration request frame to obtain the time offset with the terminal;

The time offset is sent to the terminal, so that the terminal sends data to the base station based on the time offset.

Optionally, performing frame synchronization based on the registration request frame to obtain a time offset with the terminal includes:

Obtain the first time carried in the registration request frame;

Determine a second time to obtain the registration request frame;

The time offset is determined based on the first time and the second time.

In the third aspect, embodiments of the present application provide a system for time alignment in wireless communication, including: a terminal and a base station;

The base station is configured to obtain the registration request frame sent by the terminal; perform frame synchronization based on the registration request frame to obtain a time offset with the terminal; and send the time offset to the terminal;

The terminal is used to obtain the time offset sent by the base station, and send data to the base station based on the time offset.

In the fourth aspect, embodiments of the present application provide a device for time alignment in wireless communication, including:

The first acquisition module is used to acquire the time offset sent by the base station. The time offset is obtained by the base station by acquiring the registration request frame sent by the terminal and performing frame synchronization based on the registration request frame;

The first sending module is configured to send data to the base station based on the time offset.

In the fifth aspect, embodiments of the present application provide a device for time alignment in wireless communication, including:

The second acquisition module is used to acquire the registration request frame sent by the terminal;

A determination module configured to perform frame synchronization based on the registration request frame and determine the time offset with the terminal;

The second sending module is configured to send the time offset to the terminal, so that the terminal sends data to the base station based on the time offset.

In a sixth aspect, embodiments of the present application provide an electronic device, including: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory complete communication with each other through the communication bus;

The memory is used to store computer programs;

The processor is configured to execute a program stored in the memory to implement the time alignment method in wireless communication described in the first aspect or the second aspect.

In a seventh aspect, embodiments of the present application provide a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the method for time alignment in wireless communication described in the first aspect or the second aspect is implemented. .

Compared with the existing technology, the above technical solution provided by the embodiment of the present application has the following advantages: The method provided by the embodiment of the present application obtains the time offset sent by the base station, and the time offset is obtained by the base station. The registration request frame sent by the terminal; obtained by frame synchronization based on the registration request frame; data is sent to the base station based on the time offset. In this way, through the time offset determined by the base station and the terminal, when the terminal sends data, the existence of the time offset is taken into account, and data is sent based on the time offset, so that after the terminal sends data to the base station, it can communicate with the base station. The base station time is aligned to ensure that the base station can normally receive the data sent by the terminal without any time deviation, ensuring the safe operation of power facilities.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those of ordinary skill in the art, It is said that other drawings can be obtained based on these drawings without exerting creative labor.

Figure 1 is a schematic diagram of frame composition in the EPDT protocol provided by an embodiment of the present application;

Figure 2 is a time relative diagram of a base station and a terminal provided by an embodiment of the present application;

Figure 3 is a structural diagram of a time alignment system in wireless communication provided by an embodiment of the present application;

Figure 4 is a flow chart of a time alignment method in wireless communication provided by an embodiment of the present application;

Figure 5 is a schematic diagram of time slot offset adjustment of a time alignment method in wireless communication provided by an embodiment of the present application;

Figure 6 is a flow chart of a time alignment method in wireless communication provided by another embodiment of the present application;

Figure 7 is a schematic diagram of message transmission between a terminal and a base station according to an embodiment of the present application;

Figure 8 is a structural diagram of a device for time alignment in wireless communication provided by an embodiment of the present application;

Figure 9 is a structural diagram of a device for time alignment in wireless communication provided by another embodiment of the present application;

Figure 10 is a structural diagram of an electronic device provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

Before further describing the embodiments of the present invention in detail, nouns and terms involved in the embodiments of the present invention are described. The nouns and terms involved in the embodiments of the present invention are suitable for the following explanations.

Frequency error (parts per million, ppm for short), when expressing frequency deviation, it represents the allowable deviation value at a specific center frequency, where the frequency is in Hz.

PPS (per point second, points per second) is sent through the device's positioning module, which triggers 1PPS once every second.

The positioning module may be, but is not limited to, a Beidou satellite positioning module or a GPS satellite positioning module.

In the EPDT protocol frame, as shown in Figure 1, a multiframe contains two frames, and each frame contains two time slots, namely time slot 1 and time slot 2. That is, there are four time slots in a multiframe number, that is, the four intraframe numbers are 1, 2, 3, and 4 respectively. The multiframe number and intraframe number are used as parameters for key selection to encrypt the data. It can be understood that the above-mentioned communication protocol can also be other protocol types such as DMR, PDT, MDT, etc.

EPDT's frequency error requirement is ±1PPM, that is, if the time difference of 1S is 1us, 2400S will shift by 2.4ms, and the base station will not be able to effectively receive the terminal data. 30000 seconds and 8.33 hours will be offset by one time slot. Although it can be received, the intra-frame number will be misplaced and decryption will fail.

EPDT is a narrow-band communication, and the transmission distance can reach dozens of kilometers. There will also be delays between the base station and the terminal due to the distance. The path sent by the base station and the path sent by the terminal will also have time deviations from time to time. Therefore, the base station and the terminal need to be aligned in time.

Referring to Figure 2, Figure 2 shows a relative time diagram during data transmission between the base station and the terminal. As can be seen from Figure 2, the base station sends data to the terminal, and the terminal sends data to the base station. There is a time offset (delay) in both processes.

According to an embodiment of the present application, a system for time alignment in wireless communication is provided. Optionally, in this embodiment of the present application, the above time alignment method in wireless communication can be applied to a hardware environment composed of a terminal 301 and a base station 302 as shown in FIG. 3 .

Wherein, the base station is used to obtain the registration request frame sent by the terminal; perform frame synchronization based on the registration request frame to obtain the time offset with the terminal; send the time offset to the terminal;

The terminal is used to obtain the time offset sent by the base station, and send data to the base station based on the time offset.

An embodiment of the present application provides a method for time alignment in wireless communication. This method can be applied to any form of electronic equipment, such as a terminal or a server. As shown in Figure 4, the time alignment method in wireless communication includes:

Step 401: Obtain the time offset sent by the base station. The time offset is obtained by the base station obtaining the registration request frame sent by the terminal and performing frame synchronization based on the registration request frame.

In some embodiments, the time offset is obtained by performing frame synchronization after the terminal sends a registration request frame to the base station. After determining the time offset, the base station carries the time offset in the response reply frame, so that The terminal gets this time offset.

Step 402: Send data to the base station based on the time offset.

In some embodiments, after obtaining the time offset, the terminal can determine the time difference with the base station, and then, when sending data, make adjustments based on the time offset so that the base station and the terminal are time aligned, thereby receiving to obtain accurate data.

In some embodiments, if both the base station and the terminal have 1PPS and both can obtain the current time, alignment processing can be performed based on frame characteristics.

Based on Figure 1, it can be seen that in the EPDT protocol, the multiframe number (TSCC) is 120ms per multiframe. In order to align with the multiframe, when the base station and terminal obtain 1PPS from the positioning module, they are offset by 200ms to 1200ms, and the tenth is obtained. For the timing of TSCC, since an integer number of TSCCs cannot be obtained in 1PPS, by rounding, it can be obtained that every 6S TSCC overlaps with a certain 1PPS moment, that is, the 50th TSCC in every 50 TSCCs overlaps with a certain 1PPS moment.

When you get 1PPS, you will also get the current time. Since the whole hour and minute are integer multiples of 6S, they must be multi-frame aligned. Then when it comes to the second scale, you can choose to align it every 6S. Refer to Figure 5. For example, if 8:10:42 seconds is an integer multiple of 6S, then the reset time, align 1PPS to slot 1, and the intra-frame number is 1.

Because they are aligned every 6S, and calculated based on the crystal oscillator offset of 1PPM, the maximum offset between the base station and the terminal is 12us, which has no impact on the system. The terminal and the base station can always maintain time alignment, and the intra-frame numbers are not misaligned, ensuring normal decryption and realizing safe power communication.

In an optional embodiment, sending data to the base station based on the time offset includes:

Determine whether there is a positioning module in itself;

If present, send data to the base station in advance of the time offset;

If it does not exist, data is sent to the base station two times in advance by the time offset.

In some embodiments, the positioning module is usually used to generate 1PPS and use the 1PPS to align the time slots. Based on the above related embodiments, in the presence of the positioning module, since the 1PPS sent by the positioning module can be used to align the time slots, therefore, in In the presence of a positioning module, the terminal side has already achieved alignment, and there will be a time offset from the terminal to the base station. Therefore, the terminal sends a time offset in advance, so that the base station receives the data sent by the terminal and is consistent with itself. The time slots are aligned.

In the case where the terminal does not have a positioning module, since the time slot cannot be aligned through 1PPS, it needs to be sent two time offsets in advance.

In an optional embodiment, after sending data to the base station based on the time offset, the method further includes:

The offset time of the terminal is adjusted so that the terminal is time aligned with the base station.

In an optional embodiment, adjusting the offset time of the terminal includes:

When there is a positioning module in the terminal, the current time is obtained and judged whether the current time reaches the reset update period; if so, the current frame is adjusted to the preset time slot and the preset intra-frame number, and the positioning module is used to issue per second Points, the reset update cycle includes a preset number of points per second; when the terminal does not have the positioning module, the terminal's time slot is advanced by two of the time offsets.

In some embodiments, the reset update period may be set to 6 seconds. Referring to Figure 5, when the terminal has a positioning module, since the TSCC every 6 seconds overlaps with a certain 1PPS time, therefore, when the current time is a multiple of 6 seconds, the current time slot of the terminal is set to time slot 1 , the intra-frame number is set to the beginning of TSCC, that is, intra-frame number 1, thereby achieving time calibration. When the terminal is not equipped with a positioning module, based on the above related embodiments, since there are two delays between the terminal and the base station, two delays can be extracted from the time slot of the terminal to align with the base station.

Based on the same concept, an embodiment of the present application provides a method for time alignment in wireless communication. This method can be applied to any form of electronic equipment, such as a base station or a server. As shown in Figure 6, the time alignment method in wireless communication includes:

Step 601: Obtain the registration request frame sent by the terminal.

Step 602: Perform frame synchronization based on the registration request frame to obtain a time offset with the terminal.

Step 603: Send the time offset to the terminal, so that the terminal sends data to the base station based on the time offset.

It can be understood that the above-mentioned registration request frame may also be other frames with equivalent functions.

Referring to Figure 7, after powering on, the terminal first needs to receive valid frames sent by the base station to align the time slots, and then make a registration request, send registration signaling to the base station, and carry the registration request frame in the signaling. The base station receives the terminal's After registering the request frame, the time offset delay is calculated based on the frame synchronization within the frame, and a response response is generated. The response reply frame is configured in the response response, and carries the parameter delay with the advance amount, so that the terminal receives the delay in advance. amount of delay.

In an optional embodiment, performing frame synchronization based on the registration request frame to obtain a time offset with the terminal includes:

Obtain the first time carried in the registration request frame;

Determine a second time to obtain the registration request frame;

The time offset is determined based on the first time and the second time.

In some embodiments, there are multiple ways to determine the time offset. The time offset is calculated using the time difference between the terminal's sending time and the base station's receiving time.

In a specific embodiment, this application provides a time alignment method in wireless communication. After powering on, the terminal first needs to receive a valid frame sent by the BS to align the time slots, and then make a registration request. The base station receives the registration request from the terminal. After the frame, the time offset is calculated based on the frame synchronization within the frame. The response frame contains the advance parameter, and the terminal receives the advance. When the terminal does not have a positioning module and cannot perform 1PPS alignment time slots, the terminal's time slots need to be recalibrated two delay times in advance. After that, the error rate is calibrated in real time according to the frame synchronization of the frame issued by the BS; if there is 1PPS to align the time slot, it needs to be sent a delay time in advance to make up for the wireless transmission delay in the air.

When the base station and terminal get 1PPS from the positioning chip, they will also get the current time at the same time. The whole hour and minute must be aligned in the multi-frame. Then when the second scale is reached, it will be aligned every 6S. Because they are aligned every 6S, and calculated based on the crystal oscillator offset of 1PPM, the maximum offset between the base station and the terminal is 12us, which has no impact on the system. The terminal and the base station can always maintain time alignment, and the intra-frame numbers are not misaligned, ensuring normal decryption and realizing safe power communication.

Through the above method, the time can be accurately aligned in real time, ensuring the stability of reception and the correctness of decryption. This ensures the stability and reliability of wireless power transmission.

This application uses the 1PPS method to align the time slots and provides a calibration method. Use the response frame with delay parameter to offset the air delay. This ensures the stability and reliability of the power encryption wireless communication system.

Based on the same concept, the embodiment of the present application provides a device for time alignment in wireless communication. For the specific implementation of the device, please refer to the description in the method embodiment section, and the repeated parts will not be repeated. As shown in Figure 8, the device mainly include:

The first acquisition module 801 is used to acquire the time offset sent by the base station. The time offset is obtained by the base station by acquiring the registration request frame sent by the terminal and performing frame synchronization based on the registration request frame;

The first sending module 802 is configured to send data to the base station based on the time offset.

Based on the same concept, the embodiment of the present application provides a device for time alignment in wireless communication. For the specific implementation of the device, please refer to the description in the method embodiment section, and the repeated parts will not be repeated. As shown in Figure 9, the device mainly include:

The second acquisition module 901 is used to acquire the registration request frame sent by the terminal;

Determining module 902, configured to perform frame synchronization based on the registration request frame and determine the time offset with the terminal;

The second sending module 903 is configured to send the time offset to the terminal, so that the terminal sends data to the base station based on the time offset.

Based on the same concept, the embodiment of the present application also provides an electronic device. As shown in Figure 10, the electronic device mainly includes: a processor 1001, a memory 1002 and a communication bus 1003. The processor 1001 and the memory 1002 communicate through Bus 1003 completes mutual communication. Among them, the memory 1002 stores programs that can be executed by the processor 1001. The processor 1001 executes the programs stored in the memory 1002 to implement the following steps:

Obtain the time offset sent by the base station, which is obtained by the base station by obtaining the registration request frame sent by the terminal; performing frame synchronization based on the registration request frame;

Data is sent to the base station based on the time offset. or,

Get the registration request frame sent by the terminal;

Perform frame synchronization based on the registration request frame to obtain the time offset with the terminal;

The time offset is sent to the terminal, so that the terminal sends data to the base station based on the time offset.

The communication bus 1003 mentioned in the above-mentioned electronic device may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus 1003 can be divided into an address bus, a data bus, a control bus, etc. For ease of presentation, only one thick line is used in Figure 10, but it does not mean that there is only one bus or one type of bus.

The memory 1002 may include random access memory (Random Access Memory, RAM for short), or may include non-volatile memory (non-volatile memory), such as at least one disk memory. Optionally, the memory may also be at least one storage device located far away from the aforementioned processor 1001.

The above-mentioned processor 1001 can be a general-purpose processor, including a Central Processing Unit (CPU for short), a Network Processor (NP for short), etc., or it can also be a Digital Signal Processing (DSP for short). , Application Specific Integrated Circuit (ASIC for short), Field-Programmable Gate Array (FPGA for short) or other programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components.

The electronic device provided by the embodiment of the present application may specifically be a module capable of realizing communication functions or a terminal device including the module. The terminal device may be a mobile terminal or a smart terminal. The mobile terminal can be at least one of a mobile phone, a tablet computer, a notebook computer, etc.; the smart terminal can be a terminal containing a wireless communication module such as a smart car, a smart watch, a shared bicycle, a smart cabinet, etc.; the module can be a wireless communication module. Communication module, such as any of 2G communication module, 3G communication module, 4G communication module, 5G communication module, NB-IOT communication module, etc.

In yet another embodiment of the present application, a computer-readable storage medium is also provided. A computer program is stored in the computer-readable storage medium. When the computer program is run on a computer, it causes the computer to execute the steps in the above embodiment. The described method for time alignment in wireless communications.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another, e.g., from a website, computer, server, or data center via a wireline (e.g., Coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, microwave, etc.) means to transmit to another website, computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media. The available media may be magnetic media (such as floppy disks, hard disks, magnetic tapes, etc.), optical media (such as DVDs), or semiconductor media (such as solid state drives).

It should be noted that in this article, relational terms such as “first” and “second” are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these There is no such actual relationship or sequence between entities or operations. Furthermore, the terms "comprises," "comprises," or any other variation thereof are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also those not expressly listed other elements, or elements inherent to the process, method, article or equipment. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or apparatus that includes the stated element.

The above descriptions are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement 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 practiced in 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 claimed herein.

Claims (10)

1. A method for time alignment in wireless communication, applied to a terminal, comprising:

acquiring a time offset transmitted by a base station, wherein the time offset is a registration request frame transmitted by the base station through an acquisition terminal; frame synchronization is carried out based on the registration request frame;

and transmitting data to the base station based on the time offset.

2. The method of time alignment in wireless communication of claim 1, wherein the transmitting data to a base station based on the time offset comprises:

judging whether a positioning module exists or not;

if so, transmitting data to the base station in advance of the time offset;

and if not, transmitting data to the base station by advancing the two time offsets.

3. The method of time alignment in wireless communication of claim 1, further comprising, after transmitting data to a base station based on the time offset:

the offset time of the terminal is adjusted to time align the terminal with the base station.

4. A method of time alignment in wireless communication according to claim 3, wherein said adjusting the time of the offset of the terminal comprises:

under the condition that a positioning module exists in the terminal, acquiring the current moment, and judging whether the current moment reaches a reset updating period or not; if yes, the current frame is adjusted to be a preset time slot and a preset intra-frame number, the positioning module is used for issuing the number of points per second, and the reset updating period comprises the preset number of points per second;

and under the condition that the terminal does not exist the positioning module, the time slot of the terminal is advanced by two time offsets.

5. A method for time alignment in wireless communications, applied to a base station, comprising:

acquiring a registration request frame sent by a terminal;

performing frame synchronization based on the registration request frame to obtain a time offset with the terminal;

and transmitting the time offset to a terminal so that the terminal transmits data to a base station based on the time offset.

6. The method according to claim 5, wherein said frame synchronizing based on said registration request frame, obtaining a time offset from a terminal, comprises:

acquiring a first time carried by the registration request frame;

determining a second time to acquire the registration request frame;

the time offset is determined based on the first time and the second time.

7. A system for time alignment in wireless communications, comprising: a terminal and a base station;

the base station is used for acquiring a registration request frame sent by the terminal; performing frame synchronization based on the registration request frame to obtain a time offset with the terminal; transmitting the time offset to a terminal;

the terminal is used for acquiring the time offset sent by the base station and sending data to the base station based on the time offset.

8. An apparatus for time alignment in wireless communications, comprising:

the first acquisition module is used for acquiring a time offset transmitted by a base station, wherein the time offset is a registration request frame transmitted by the base station through an acquisition terminal; frame synchronization is carried out based on the registration request frame;

and the first sending module is used for sending data to the base station based on the time offset.

9. An electronic device, comprising: the device comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;

the memory is used for storing a computer program;

the processor configured to execute a program stored in the memory to implement the method for time alignment in wireless communication according to any one of claims 1 to 6.

10. A computer readable storage medium storing a computer program, which when executed by a processor implements the method of time alignment in wireless communication of any of claims 1-6.