CN117715172B - Synchronization signal method, device and medium in wireless ad hoc network system - Google Patents

Abstract

The invention discloses a synchronous signal method, equipment and medium in a wireless ad hoc network system, which belongs to the technical field of wireless LTE ad hoc networks, and aims to solve the technical problems of how to realize high-efficiency, reliable and time synchronization suitable for various environments independent of GPS signals so as to meet the demands of the wireless ad hoc network in various application fields, and adopts the following technical scheme: the method is that the self-organizing network system adopts TDMA multiple access, and each node of the self-organizing network system is configured with different synchronous signal sending periods according to the node type and the time synchronization requirement; the bottom hardware of the synchronous signal receiving part of the self-organizing network system adopts the same circuit logic, and realizes flexible synchronous signal receiving and detecting by modifying the corresponding receiving mode configuration aiming at different synchronous signal sending period configurations, thereby realizing the synchronization in the wireless self-organizing network system.

Description

Synchronization signal method, device and medium in wireless ad hoc network system

Technical Field

The present invention relates to the technical field of wireless LTE self-organizing network, and in particular to a synchronization signal method, device and medium in a wireless self-organizing network system.

Background technique

A wireless ad-hoc network is a wireless communication network in which nodes can autonomously form a temporary network without infrastructure or central control. Wireless ad-hoc networks have unique advantages in flexibility and scalability and are widely used in military communications, emergency rescue, the Internet of Things and other fields.

In wireless ad hoc networks, time synchronization between nodes is essential to achieve efficient communication and collaboration. The transmission and reception of synchronization signals are essential for the time calibration of nodes to ensure that the nodes communicate in the same time interval.

At present, some methods of synchronization signals have been proposed and applied in wireless ad hoc networks. Among them, a common method is time synchronization based on the Global Positioning System (GPS). This method uses GPS signals as synchronization signals and calculates time offsets and clock drifts through nodes receiving GPS signals to achieve time synchronization between nodes.

However, synchronization methods that rely on GPS signals may be limited in certain scenarios, such as in indoor environments, urban canyons, or areas with severe occlusion such as dense buildings. In addition, the cost and power consumption of GPS devices are also a consideration.

Therefore, how to achieve efficient, reliable and suitable time synchronization for various environments independent of GPS signals to meet the needs of wireless ad hoc networks in various application fields is a technical problem that needs to be solved urgently.

Summary of the invention

The technical task of the present invention is to provide a synchronization signal method, device and medium in a wireless ad hoc network system to solve the problem of how to achieve efficient, reliable and suitable time synchronization for various environments independent of GPS signals to meet the needs of wireless ad hoc networks in various application fields.

The technical task of the present invention is achieved in the following way: a synchronization signal method in a wireless self-organizing network system, wherein the self-organizing network system adopts TDMA (Time Division Multiple Access) multiple access, and each node of the self-organizing network system is configured with a different synchronization signal sending period according to the node type and the need for time synchronization; the underlying hardware of the synchronization signal receiving part of the self-organizing network system adopts the same circuit logic, and for different synchronization signal sending period configurations, flexible synchronization signal reception and detection are achieved by modifying the corresponding receiving mode configuration, thereby achieving synchronization in the wireless self-organizing network system.

Preferably, the synchronization signal reception and detection are specifically as follows:

;

in, Indicates the number of sampling points contained in each subframe; /> Indicates the synchronization signal, /> The number of sampling points included is/> ; The synchronization signal sending period of any node/> subframes; the detection of the synchronization signal is to detect the length of/> In the correlation window, search for the position with the largest correlation value/> ; From the synchronization signal reception and detection process, it can be seen that the correlation length is related to the synchronization signal transmission period/> Proportional, /> The larger the value, the larger the synchronization signal correlation value buffer required.

Preferably, the factors affecting the node synchronization signal sending period are as follows:

① Node scale of the self-organizing network: Generally speaking, the larger the node scale of the self-organizing network, the longer the synchronization signal transmission cycle is, so as to avoid excessive synchronization signal overhead;

② Ad hoc network node type: Generally speaking, the closer the node is to the dispatch center of the ad hoc network system, the shorter the synchronization signal sending period is; while the closer the node is to the edge of the ad hoc network system, the longer the synchronization signal sending period is, so as to ensure the best synchronization performance.

Preferably, the structure of the subframe is as follows:

A subframe consists of several OFDM symbols; the first OFDM symbol is used for AGC, the second to fourth OFDM symbols are used to send synchronization (Sync) signals, and the last OFDM symbol is used as a guard interval GP.

Preferably, a plurality of (N) subframes constitute a frame; wherein, one or more subframes among the N subframes are used as synchronization subframes, the purpose of which is to be used for nodes to send synchronization signals so that neighboring nodes of the synchronization subframes complete time synchronization and timing maintenance of the synchronization subframes.

Preferably, the synchronization signal reception and detection of the node is achieved through a synchronization signal correlator structure, which includes two ping-pong synchronization signal correlators, each of which has a length of M. The synchronization signal correlator length M is much smaller than the frame length N of the ad hoc network system.

More preferably, when the synchronization signal sending period R of any node is greater than M, the synchronization signal detector adopts a ping-pong method for detection, that is, through the alternating working mode of the two synchronization signal correlators of ping-pong, without increasing any hardware complexity, continuous detection of the synchronization signal when the synchronization signal sending period is R is achieved.

Preferably, the synchronization signal receiving configuration of the ad hoc network system is as follows:

(1) For M consecutive subframes: subframe 0 to subframe M-1, a ping synchronization signal correlator is configured to perform correlation operations for synchronization signal reception and detection;

(2) For the next M consecutive subframes: M-subframe 2M-1, a pong synchronization signal correlator is configured to perform correlation operations for synchronization signal reception and detection; at this time, after the ping synchronization signal correlator performs correlation operations, peak detection is performed;

(3) For the next M consecutive subframes: M-subframe 2M-1, a ping synchronization signal correlator is configured to perform correlation operation; at this time, after the pong synchronization signal correlator performs the correlation operation, subsequent processing such as selecting the maximum value is performed on the correlation processing result.

An electronic device comprising: a memory and at least one processor;

Wherein, the memory stores a computer program;

The at least one processor executes the computer program stored in the memory, so that the at least one processor executes the synchronization signal method in the wireless ad hoc network system as described above.

A computer-readable storage medium stores a computer program, and the computer program can be executed by a processor to implement the synchronization signal method in the wireless ad hoc network system as described above.

The synchronization signal method, device and medium in the wireless ad hoc network system of the present invention have the following advantages:

(i) The present invention provides a flexible synchronization signal transmission configuration, which meets the time synchronization requirements of wireless ad hoc networks in various environments; at the same time, for different synchronization signal transmission configurations, the underlying hardware adopts the same circuit logic, and realizes flexible support for different transmission configurations by configuring corresponding receiving modes;

(ii) The present invention adopts the TDMA (Time Division Multiple Access) multiple access scheme. TDMA is a wireless communication technology used to implement time division multiple access in wireless ad hoc networks. Compared with other multiple access schemes, TDMA ad hoc networks have the advantages of high time efficiency, good synchronization performance, and strong anti-interference performance;

(III) The present invention realizes a wireless ad hoc network synchronization signal that is efficient, reliable, applicable to various environments and independent of external reference signals, so as to meet the time synchronization requirements of wireless ad hoc networks in various environments.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described below in conjunction with the accompanying drawings.

Figure 1 is a schematic diagram of the frame structure of a wireless ad hoc network system;

Figure 2 is a synchronous subframe structure of a self-organizing network system;

Figure 3 is a schematic diagram of the structure of a self-organizing network synchronization signal correlator;

Figure 4 is a schematic diagram of the configuration of the self-organizing network synchronization signal reception.

Detailed ways

The synchronization signal method, device and medium in the wireless ad hoc network system of the present invention are described in detail below with reference to the accompanying drawings and specific embodiments of the specification.

Embodiment 1:

This embodiment provides a synchronization signal method in a wireless ad hoc network system. The method is that the ad hoc network system adopts TDMA (Time Division Multiple Access) multiple access. According to the node type and the need for time synchronization, each node in the ad hoc network system is configured with a different synchronization signal sending period. The underlying hardware of the synchronization signal receiving part of the ad hoc network system adopts the same circuit logic. For different synchronization signal sending period configurations, flexible synchronization signal reception and detection are achieved by modifying the corresponding receiving mode configuration, thereby achieving synchronization in the wireless ad hoc network system.

The synchronization signal reception and detection in this embodiment are specifically as follows:

;

in, Indicates the number of sampling points contained in each subframe; /> Indicates the synchronization signal, /> The number of sampling points included is/> ; The synchronization signal sending period of any node/> subframes; the detection of the synchronization signal is to detect the length of/> In the correlation window, search for the position with the largest correlation value/> ; From the synchronization signal reception and detection process, it can be seen that the correlation length is related to the synchronization signal transmission period/> Proportional, /> The larger the value, the larger the synchronization signal correlation value buffer required.

In this embodiment, in the design of the ad hoc network system, the factors affecting the node synchronization signal transmission period are as follows:

① Node scale of the self-organizing network: Generally speaking, the larger the node scale of the self-organizing network, the longer the synchronization signal transmission cycle is, so as to avoid excessive synchronization signal overhead;

② Ad hoc network node type: Generally speaking, the closer the node is to the dispatch center of the ad hoc network system, the shorter the synchronization signal sending period is; while the closer the node is to the edge of the ad hoc network system, the longer the synchronization signal sending period is, so as to ensure the best synchronization performance.

As shown in FIG. 2 , the structure of the subframe is as follows:

A subframe consists of several OFDM symbols; the first OFDM symbol is used for AGC, the second to fourth OFDM symbols are used to send synchronization (Sync) signals, and the last OFDM symbol is used as a guard interval GP.

As shown in FIG1 , a plurality of (N) subframes constitute a frame; wherein, one or more subframes among the N subframes are used as synchronization subframes, the purpose of which is to be used by nodes to send synchronization signals so that neighboring nodes of the synchronization subframes can complete time synchronization and timing maintenance of the synchronization subframes.

As shown in Figure 3, the synchronization signal reception and detection of the node is realized through the synchronization signal correlator structure. The synchronization signal correlator structure includes two ping-pong synchronization signal correlators. The length of each synchronization model correlator is M, and the synchronization signal correlator length M is much smaller than the frame length N of the self-organizing network system.

When the synchronization signal sending period R of any node is greater than M, the synchronization signal detector adopts ping-pong detection, that is, through the alternating working mode of two synchronization signal correlators in ping-pong, continuous detection of the synchronization signal when the synchronization signal sending period is R is achieved without increasing any hardware complexity.

As shown in Figure 4, the synchronization signal receiving configuration of the ad hoc network system is as follows:

(1) For M consecutive subframes: subframe 0 to subframe M-1, a ping synchronization signal correlator is configured to perform correlation operations for synchronization signal reception and detection;

(2) For the next M consecutive subframes: M-subframe 2M-1, a pong synchronization signal correlator is configured to perform correlation operations for synchronization signal reception and detection; at this time, after the ping synchronization signal correlator performs correlation operations, peak detection is performed;

(3) For the next M consecutive subframes: M-subframe 2M-1, a ping synchronization signal correlator is configured to perform correlation operation; at this time, after the pong synchronization signal correlator performs the correlation operation, subsequent processing such as selecting the maximum value is performed on the correlation processing result.

Embodiment 2:

This embodiment also provides an electronic device, including: a memory and a processor;

Wherein, the memory stores computer-executable instructions;

The processor executes the computer-executable instructions stored in the memory, so that the processor executes the synchronization signal method in the wireless ad hoc network system in any embodiment of the present invention.

The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor may be a microprocessor or any conventional processor, etc.

The memory can be used to store computer programs and/or modules. The processor realizes various functions of the electronic device by running or executing the computer programs and/or modules stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the terminal, etc. In addition, the memory can also include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (SMC), a secure digital (SD) card, a flash memory card, at least one disk storage period, a flash memory device, or other volatile solid-state storage devices.

Embodiment 3:

The embodiment of the present invention further provides a computer-readable storage medium, in which a plurality of instructions are stored, and the instructions are loaded by a processor, so that the processor executes the synchronization signal method in the wireless ad hoc network system in any embodiment of the present invention. Specifically, a system or device equipped with a storage medium can be provided, on which a software program code for implementing the functions of any of the above embodiments is stored, and a computer (or CPU or MPU) of the system or device reads and executes the program code stored in the storage medium.

In this case, the program code itself read from the storage medium can realize the function of any one of the above-mentioned embodiments, and thus the program code and the storage medium storing the program code constitute a part of the present invention.

Examples of storage media for providing program code include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RYM, DVD-RW, DVD+RW), magnetic tapes, non-volatile memory cards, and ROMs. Alternatively, program code may be downloaded from a server computer via a communication network.

In addition, it should be clear that the functions of any of the above embodiments can be implemented not only by executing the program code read by the computer, but also by enabling an operating system operating on the computer to complete part or all of the actual operations based on instructions from the program code.

In addition, it can be understood that the program code read from the storage medium is written to a memory provided in an expansion board inserted into the computer or written to a memory provided in an expansion unit connected to the computer, and then based on the instructions of the program code, a CPU installed on the expansion board or the expansion unit is enabled to perform part or all of the actual operations, thereby realizing the functions of any of the above-mentioned embodiments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. A synchronous signal method in wireless self-organizing network system is characterized in that the self-organizing network system adopts TDMA multiple access, and each node of the self-organizing network system is configured with different synchronous signal transmission periods according to the type of the node and the time synchronization requirement; the bottom hardware of the synchronous signal receiving part of the self-organizing network system adopts the same circuit logic, and realizes flexible synchronous signal receiving and detecting by modifying the corresponding receiving mode configuration aiming at different synchronous signal sending period configurations, thereby realizing the synchronization in the wireless self-organizing network system;

The synchronous signal receiving and detecting of the node is realized through a synchronous signal correlator structure, the synchronous signal correlator structure comprises two synchronous signal correlators, the length of each synchronous signal correlator is M, and the length M of the synchronous signal correlator is smaller than the frame length N of the self-organizing network system;

When the synchronous signal sending period R of any node is larger than M, the synchronous signal detector adopts a ping-pong mode to detect, namely, the synchronous signal continuous detection when the random synchronous signal sending period is R is realized under the condition that the hardware complexity is not increased by the alternate working mode of ping-pong 2 synchronous signal correlators;

The ad hoc network system synchronization signal receiving configuration is specifically as follows:

(1) For consecutive M subframes: subframe 0-subframe M-1, configuring a ping synchronizing signal correlator to perform synchronizing signal receiving and detecting correlation operation;

(2) For the next consecutive M subframes: m-subframe 2M-1, configuring pong synchronous signal correlator to receive synchronous signal and detect correlation operation; at this time, after the correlation operation is executed by the ping synchronous signal correlator, peak detection is carried out;

(3) For the next consecutive M subframes: m-subframe 2M-1, configure the correlation operation that the ping synchronous signal correlator carries on synchronous signal reception and detection; at this time, after the pong synchronous signal correlator executes the correlation operation, the subsequent processing of selecting the maximum value is performed on the correlation processing result.

2. The method for synchronizing signals in a wireless ad hoc network system according to claim 1, wherein the synchronizing signal receiving and detecting steps are as follows:

；

wherein, Representing the number of sampling points contained in each subframe; /(I)Representing a synchronization signal,/>The number of the sampling points is/>; Synchronization signal transmission cycle of any nodeA sub-frame; the detection of the synchronization signal is performed at a length ofSearching for a position/within the correlation window where the correlation value is maximum。

3. The synchronization signal method in a wireless ad hoc network system according to claim 2, wherein the influence factors of the synchronization signal transmission period of the node are as follows:

① Ad hoc network node scale: the larger the ad hoc network node scale is, the larger the synchronous signal transmission period is;

② Ad hoc network node type: the node at the dispatching center position of the ad hoc network system has smaller synchronous signal sending period; and the larger the synchronous signal transmission period of the node at the edge position of the self-organizing network system.

4. The synchronization signal method in a wireless ad hoc network system according to claim 3, wherein the structure of the subframe is as follows:

One subframe consists of a plurality of OFDM symbols; wherein, the 1 st OFDM symbol is used for AGC, the 2 nd-4 th OFDM symbol is used for transmitting synchronous signals, and the last OFDM symbol is used as a protection interval GP.

5. The method for synchronizing signals in a wireless ad hoc network system according to claim 4, wherein a plurality of subframes constitute one frame; one or more subframes in the N subframes are used as synchronous subframes, and the purpose is for the node to send a synchronous signal, so that the adjacent node of the synchronous subframes can complete time synchronization and timing maintenance of the synchronous subframes.

6. An electronic device, comprising: a memory and at least one processor;

Wherein the memory has a computer program stored thereon;

The at least one processor executing the computer program stored by the memory causes the at least one processor to perform the synchronization signal method in the wireless ad hoc network system of any one of claims 1 to 5.

7. A computer readable storage medium having stored therein a computer program executable by a processor to implement the synchronization signal method in a wireless ad hoc network system according to any of the claims 1 to 5.