CN118158834A

CN118158834A - Signal transmission method, transmitting device and receiving device in point-to-point communication

Info

Publication number: CN118158834A
Application number: CN202410579086.1A
Authority: CN
Inventors: 李静; 檀甲甲; 倪海峰; 丁克忠
Original assignee: Nanjing Chuangxin Huilian Technology Co ltd
Current assignee: Nanjing Chuangxin Huilian Technology Co ltd
Priority date: 2024-05-11
Filing date: 2024-05-11
Publication date: 2024-06-07
Anticipated expiration: 2044-05-11
Also published as: CN118158834B

Abstract

The present application relates to a signal transmission method, a transmitting apparatus, and a receiving apparatus in point-to-point communication. The method provided in one aspect is used for a first node in a peer-to-peer communication system, the peer-to-peer communication system further comprises a second node, the method comprises the steps of responding to a second synchronous signal sent by the second node to generate a random sequence based on a first generation rule in the case that the first node is a receiving end, the first generation rule is also used for enabling the first node to generate a secondary synchronous code based on the first generation rule, fourier transformation processing is conducted on the random sequence to obtain a random frequency domain signal, first resource mapping processing is conducted on the random frequency domain signal to obtain a random access preamble, and the random access preamble is sent to the second node for the second node to establish a wireless communication link with the first node based on the random access preamble. By adopting the method, the area of a communication chip used by the node in the point-to-point communication can be reduced.

Description

Signal transmission method, transmitting device and receiving device in point-to-point communication

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a signal transmission method, a transmitting device, and a receiving device in point-to-point communications.

Background

D2D (Device-to-Device) communication technology refers to a communication manner in which two peer user nodes directly communicate with each other. In a network of D2D communication subscribers, each subscriber node is capable of transmitting and receiving signals.

The precondition that two user nodes can communicate with each other is mutual synchronization, and in a scenario without cellular network coverage or GNSS (Global Navigation SATELLITE SYSTEM ) coverage, the user nodes in the D2D network need to rely on synchronization signals sent by themselves to maintain mutual synchronization. In addition, random access is a necessary process for establishing a wireless link by the user nodes, and data transmission can be normally performed between the user nodes only if the random access is successful. In order to ensure the correctness and effectiveness of the random access technology, a preamble code needs to be added in the random access process to form a random access signal so as to realize synchronization and control.

Therefore, the existing D2D communication technology requires the user node to have both the function of transmitting and receiving the synchronization signal and the random access signal. However, from a chip design perspective, this results in a larger communication chip area for the user node.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a signal transmission method, a transmitting apparatus, and a receiving apparatus in point-to-point communication capable of reducing the communication chip area of an end user node.

In a first aspect, the present application provides a signal transmission method in a peer-to-peer communication, for a first node in a peer-to-peer communication system, where the peer-to-peer communication system further includes a second node, the method including:

Under the condition that the first node is a receiving end, responding to a second synchronous signal sent by the second node, acquiring a random sequence based on a first generation rule, wherein the first generation rule is also used for the first node to generate an auxiliary synchronous code based on the first generation rule;

performing Fourier transform processing based on the random sequence to obtain a random frequency domain signal;

Performing first resource mapping processing on the random frequency domain signal to obtain a random access preamble;

The random access preamble is transmitted to the second node for the second node to establish a wireless communication link with the first node based on the random access preamble.

In one embodiment, performing resource mapping processing on a random frequency domain signal to obtain a random access preamble, including:

and repeatedly mapping the random frequency domain signal to a first symbol and a second symbol to obtain a random access preamble, wherein the first symbol and the second symbol are separated by a guard interval symbol.

In one embodiment, the random access preamble includes two guard interval symbols, wherein a first symbol or a second symbol is spaced between the two guard interval symbols.

In a second aspect, the present application provides a signal transmission method in a peer-to-peer communication, for a second node in a peer-to-peer communication system, where the peer-to-peer communication system further includes a first node, the method including:

under the condition that the second node serves as a transmitting end, acquiring a random access preamble transmitted by the first node, wherein the random access preamble is acquired by the first node based on a first generation rule, and the first generation rule is also used for the first node to generate a secondary synchronization code based on the first generation rule;

And performing secondary synchronization signal detection processing based on the random access preamble, and determining time offset from the first node to the second node, wherein the time offset is used for the second node to establish a wireless communication link with the first node based on the time offset.

In one embodiment, performing secondary synchronization signal detection processing based on a random access preamble, determining a time offset in a direction from a first node to a second node includes:

Acquiring a plurality of local reference sequences;

Performing related operation processing on the random access preamble and a plurality of local reference sequences respectively to obtain a plurality of power delay spectrums;

determining a target peak value according to the maximum value in the peak values corresponding to the power delay spectrums;

and if the target peak value is larger than the preset threshold, obtaining time offset according to the target peak value and the power delay spectrum corresponding to the target peak value.

In a third aspect, the present application provides a signal transmitting apparatus in a peer-to-peer communication, for a first node in a peer-to-peer communication system, the peer-to-peer communication system further comprising a second node, the apparatus comprising:

The sequence acquisition module is used for responding to a second synchronous signal sent by the second node under the condition that the first node is a receiving end, acquiring a random sequence based on a first generation rule, wherein the first generation rule is also used for the first node to generate a secondary synchronous code based on the first generation rule;

the discrete Fourier transform module is used for carrying out Fourier transform processing based on the random sequence to obtain a random frequency domain signal;

The resource mapping module is used for carrying out first resource mapping processing on the random frequency domain signal to obtain a random access lead code, and the random access lead code is used for being sent to a second node so that the second node can establish a wireless communication link with the first node based on the random access lead code.

In one embodiment, the sequence obtaining module is further configured to obtain, when the first node is a transmitting end, a primary synchronization code based on a second generation rule and obtain based on the first generation rule;

The discrete Fourier transform module is also used for transmitting the primary synchronization code and the secondary synchronization code to the resource mapping module;

And the resource mapping module is also used for carrying out second resource mapping processing based on the primary synchronous code and the secondary synchronous code to obtain a first synchronous signal.

In a fourth aspect, the present application provides a signal receiving apparatus in peer-to-peer communication, for a second node in a peer-to-peer communication system, the peer-to-peer communication system further comprising a first node, the apparatus comprising:

The data acquisition module is used for acquiring a random access preamble sent by the first node under the condition that the second node serves as a sending end, wherein the random access preamble is acquired by the first node based on a first generation rule, and the first generation rule is also used for the first node to generate auxiliary synchronization based on the first generation rule;

The secondary synchronization signal detection module is used for carrying out secondary synchronization signal detection processing based on the random access preamble code, determining random access time offset from the first node to the second node, wherein the random access time offset is used for the second node to establish a wireless communication link with the first node based on the time offset.

In one embodiment, the apparatus further comprises a primary synchronization signal detection module and an output module, wherein,

The data acquisition module is further used for acquiring synchronous signals sent to the second node by other nodes under the condition that the second node serves as a receiving end;

the main synchronous signal detection module is used for detecting a main synchronous code based on the synchronous signal to obtain a main time offset;

the auxiliary synchronous signal detection module is also used for carrying out auxiliary synchronous code detection processing based on the synchronous signal to obtain auxiliary time offset;

and the output module is used for processing based on the main time offset and the auxiliary time offset to obtain the receiving time offset from other nodes to the second node.

In a fifth aspect, the present application provides a point-to-point communication system. The system comprises a plurality of nodes for performing the steps of the methods of the first and second aspects described above.

The signal transmission method, the transmitting device and the receiving device in the peer-to-peer communication, wherein the method is used for a first node in the peer-to-peer communication system, the peer-to-peer communication system further comprises a second node, the method comprises the steps of responding to a second synchronous signal sent by the second node under the condition that the first node is a receiving end, generating a random sequence based on a first generation rule, generating a secondary synchronous code by the first node based on the first generation rule, performing Fourier transform processing based on the random sequence to obtain a random frequency domain signal, performing first resource mapping processing on the random frequency domain signal to obtain a random access lead code, and sending the random access lead code to the second node for the second node to establish a wireless communication link with the first node based on the random access lead code; in this way, by means of the first generation rule used for generating the auxiliary synchronization code in the synchronization signal in the first node, the random access preamble is jointly designed, on the basis of the hardware for generating the synchronization signal in the first node, the generation of the random access preamble can be further realized through software configuration, and the synchronization signal and the generation of the random access preamble cannot occur simultaneously on the same node, so that each node in the point-to-point communication network can use the same set of hardware modules to realize the generation of the synchronization signal and the random access signal with lower cost, and the area of a communication chip is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is an application environment diagram of a signal transmission method in point-to-point communication in one embodiment;

FIG. 2 is a flow chart of a method of signal transmission in point-to-point communication provided in one embodiment;

FIG. 3 is a diagram illustrating a data structure of a synchronization signal according to an embodiment;

FIG. 4 is a diagram illustrating a data structure of a random access preamble in one embodiment;

fig. 5 is a flow chart of a signal transmission method in point-to-point communication according to another embodiment;

FIG. 6 is a flowchart illustrating a step of obtaining a time offset in one embodiment;

fig. 7 is a schematic structural diagram of a signal transmitting apparatus in point-to-point communication according to an embodiment;

Fig. 8 is a schematic structural diagram of a signal receiving apparatus in point-to-point communication according to an embodiment;

fig. 9 is an internal block diagram of an end node in one embodiment.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

The signal transmission method in the point-to-point communication provided by the embodiment of the application can be applied to an application environment shown in fig. 1. Fig. 1 shows the operation of a point-to-point communication, i.e. a communication between two peer nodes (first and second terminal) directly, each node being able to send and receive signals. In a point-to-point communication network, nodes act as both a server and a client, and users are able to recognize each other's presence, forming a virtual or actual community, self-organised. The first terminal and the second terminal can be, but not limited to, various personal computers, notebook computers, smart phones, tablet computers, internet of things equipment and portable wearable equipment, wherein the internet of things equipment can be an intelligent sound box, an intelligent television, an intelligent air conditioner, intelligent vehicle-mounted equipment and the like; the portable wearable device may be a smart watch, smart bracelet, headset, or the like.

In an exemplary embodiment, referring to fig. 2, a signal transmission method in peer-to-peer communication is provided, which is used for a first node in a peer-to-peer communication system, where the peer-to-peer communication system further includes a second node, where, taking an application environment of the method shown in fig. 1 as an example, a first terminal may be regarded as the first node, a second terminal may be regarded as the second node, and the second terminal may also be regarded as the second node, where the first and second nodes are only for convenience of describing two ends in a communication process and are not limiting on functions of two nodes, it is to be understood that the first node may be any node in the peer-to-peer communication system, and the second node is any node that performs data transceiving with the first node in the peer-to-peer communication system. As shown in fig. 2, the method provided in this embodiment includes the following steps 202 to 208, in which:

step 202, in the case that the first node is a receiving end, in response to a second synchronization signal sent by the second node, a random sequence is obtained based on a first generation rule, where the first generation rule is further used for the first node to generate a secondary synchronization code based on the first generation rule.

In this embodiment, the first synchronization signal refers to a synchronization signal generated by the first node, and the second synchronization signal refers to a synchronization signal generated by the second node. In the case that the first node is a receiving end, the second node is a transmitting end, and the second node actively transmits a second synchronization signal to the first node, so that the first node obtains relevant information of the first node and time synchronization information in the direction from the first node to the second node based on the second synchronization signal, wherein the time synchronization information can be called a receiving time offset or a clock offset; the second node then transmits a random access preamble to the first node to establish a wireless communication link between the first node and the second node.

When the first node is a receiving end, after receiving a second synchronous signal sent by the second node, generating a random access preamble and sending the random access preamble to the second node so as to establish a wireless communication link; when the first node is a transmitting end, the first node actively generates a first synchronization signal to the second node when the first node establishes a wireless communication link with the second node, and the second node generates a random access preamble and transmits the random access preamble to the first node after receiving the first synchronization signal so as to ensure that the first node and the second node keep synchronous in time and frequency, and reliable data transmission is realized. It can be seen that each node in a point-to-point communication needs to support both the generation of synchronization signals and the generation of random access preambles. In the related art, the generation of the random access preamble and the generation of the synchronization signal are two independent processes, and an independent hardware module needs to be designed in the communication chip corresponding to each node to support the generation of the two signals, so that the area of the communication chip is larger.

In this embodiment, after receiving the second synchronization signal sent by the second node, the first node serving as the receiving end generates the random sequence for constructing the random access preamble by means of the first generation rule for generating the secondary synchronization code in the synchronization signal generation process, so that the same set of hardware modules can be used for generating the synchronization signal and the random access preamble, so as to reduce the area of the communication chip.

The following disclosure first provides an example of synchronization signal generation in a point-to-point communication technology to illustrate the principles of the signal transmission method provided by the present disclosure. In point-to-point communication, synchronization signals are very important because they ensure reliable data transmission between devices. The design and use of synchronization signals is further complicated by the fact that point-to-point communication does not need to go through some intermediate devices such as base stations.

In point-to-point communication, the synchronization signal typically includes a primary synchronization code (Primary Synchronization Signal, PSS) and a secondary synchronization code (Secondary Synchronization Signal, SSS). Wherein the primary synchronization code, also called primary synchronization signal, is used to locate the time when the transmission starts and ends. The secondary synchronization code is also called a secondary synchronization signal for achieving frequency synchronization and phase synchronization. The existence of the primary synchronization code and the secondary synchronization code can ensure that the receiving and transmitting sides keep synchronous in time and frequency in point-to-point communication, thereby realizing reliable data transmission.

In an exemplary embodiment, the first node generates a primary synchronization code based on the second generation rule, and generates a first synchronization signal based on the secondary synchronization code and the primary synchronization code; for example, the synchronization signal may be generated with reference to NR (New Radio) protocol 38.211. The primary synchronization code may be a pseudo-random sequence with a length of 127, and an m-sequence modulated by frequency domain BPSK (Binary PHASE SHIFT KEYING ), wherein the m-sequence is modulated according to specific cyclic shift positions, which are 0, 43 and 86. The m-sequence is the short for the longest linear shift register sequence, and is a pseudo-random sequence. The sequence generation formula of the primary synchronization code corresponding to the second generation rule is as follows:

; equation 1

Wherein,，/>，/>，。

The secondary synchronization code may be an m-sequence of length 127 modulated with frequency domain BPSK, with two generator polynomials; exemplary, the sequence generation formula of the secondary synchronization code corresponding to the first generation rule is as follows:

; equation 2

Wherein,，/>，，

。

Each node in the point-to-point communication network corresponds to a unique one when generating the synchronization signalAnd/>Combining, decoding synchronization signal acquisition/>And/>The node can be positioned, and further, the clock and the frequency are synchronized. By different/>And/>And the combination can realize multiplexing of multiple nodes.

In the 38.211 protocol, the synchronization signal is also referred to as a synchronization signal block; the synchronization signal block generated under the protocol is shown in fig. 3, and occupies 4 OFDM symbols in the time domain (symbols 0 to 3 are sequentially shown in the time domain direction in fig. 3), 20 PRBs (Physical Resource Block, physical resource blocks) are occupied in the frequency domain, and each PRB occupies 12 subcarriers, that is, the synchronization signal block occupies 240 subcarriers in total. In fig. 3, SCS is an abbreviation of Sub-CARRIER SPACING, meaning a subcarrier spacing, and the number of subcarriers is expressed by SCS. In the time domain, the primary synchronization code is located at symbol 0 and the secondary synchronization code is located at symbol 2. In the frequency domain, the primary synchronization code and the secondary synchronization code are mapped to the continuous 127 subcarriers among 12 PRBs of the synchronization signal block, and the complete 12 PRBs occupy 144 subcarriers in total, so that two sides of the primary synchronization code and the secondary synchronization code respectively have 8 subcarriers and 9 subcarriers, and the subcarriers on the two sides serve as guard bands, and zero power is transmitted.

In addition, synchronization signals generated under 38.211 protocol are typically combined with broadcast signals PBCH (Physical Broadcast CHannel ) to form SSBs (Synchronization Signal/PBCH, synchronized broadcast blocks). The PBCH is a special channel carrying MIB (Master Information Block, main system information block) and is located on symbol 1, symbol 3 and symbol 2 in the time domain, wherein all subcarriers are occupied on symbol 1 and symbol 3, and all subcarriers except the secondary synchronization code occupied subcarrier and the guard band occupied subcarrier are occupied on symbol 2.

It should be noted that only one kind of synchronization signal structure to which the method disclosed in the present application is applicable is disclosed herein, and the synchronization signal structure is not particularly limited.

In a possible implementation, the random sequence is obtained based on a first generation rule, which may be generated based on formula 2, where the first node may optionally select a group when generating the random sequenceAnd/>The combination may or may not correspond to the first node. For example, the process of obtaining the random sequence may include generating the random sequence in real time; also for example, a plurality of sequences may be generated in advance according to the first rule and stored in a preset location, and one of the plurality of sequences is selected when the random access preamble needs to be generated.

And 204, performing Fourier transform processing based on the random sequence to obtain a random frequency domain signal.

Wherein, a random frequency domain signal is obtained according to formula 3:

; equation 3

Wherein,For the random sequence generated based on equation 2, l=127.

Step 206, performing a first resource mapping process on the random frequency domain signal to obtain a random access preamble.

In point-to-point communication, a random access preamble may be used to send a request or indication to other devices so that a communication connection between the devices may be established. The random access preamble has the main functions of device identification and positioning, time and spectrum resource allocation, establishment of ordered connection among devices and the like. Thus, the random access preamble plays an important role in coordinating contention among devices and establishing an orderly connection in point-to-point communication.

For example, the first resource mapping process is performed according to the random frequency domain signal, and the process of generating the random access preamble may adopt a method of directly inserting the random frequency domain signal into the specific sequence, a method of generating the random signal by repeating the random frequency domain signal, a method of simply deforming the random frequency domain signal, or a combination of at least two of the above three methods.

Step 208, the random access preamble is sent to the second node, so that the second node establishes a wireless communication link with the first node based on the random access preamble.

The first node performs air interface transmission processing on the generated random access preamble and then transmits the random access preamble to the second node through an antenna.

The signal transmission method in the peer-to-peer communication provided in the above embodiment is used for a first node in a peer-to-peer communication system, where the peer-to-peer communication system further includes a second node, and the method includes, in a case that the first node is a receiving end, responding to a second synchronization signal sent by the second node, generating a random sequence based on a first generation rule, where the first generation rule is further used for the first node to generate an auxiliary synchronization code based on the first generation rule, performing fourier transform processing based on the random sequence to obtain a random frequency domain signal, performing first resource mapping processing on the random frequency domain signal to obtain a random access preamble, and sending the random access preamble to the second node for the second node to establish a wireless communication link with the first node based on the random access preamble; in this way, by means of the first generation rule used for generating the auxiliary synchronization code in the synchronization signal in the first node, the random access preamble is jointly designed, on the basis of the hardware for generating the synchronization signal in the first node, the generation of the random access preamble can be further realized through software configuration, and the synchronization signal and the generation of the random access preamble cannot occur simultaneously on the same node, so that each node in the point-to-point communication network can use the same set of hardware modules to realize the generation of the synchronization signal and the random access signal with lower cost, and the area of a communication chip is reduced.

In an exemplary embodiment, the process of performing resource mapping processing on the random frequency domain signal to obtain the random access preamble includes: and repeatedly mapping the random frequency domain signal to a first symbol and a second symbol to obtain a random access preamble, wherein the first symbol and the second symbol are separated by a guard interval symbol.

For example, please refer to fig. 4, which is a schematic diagram of a data structure of a random access preamble, wherein symbol 0 is a first symbol, symbol 2 is a second symbol, and symbol 1 is a guard interval symbol (GAP). Also by way of example, symbol 1 in fig. 4 is a first symbol and symbol 3 is a second symbol.

After the random sequence is converted to the frequency domain through discrete fourier transform to obtain a random frequency domain signal, the random sequence occupies 12 RBs (Resource blocks) and is mapped to 127 subcarriers in the middle of one OFDM symbol. The random access preamble occupies at least 3 symbols, and the random frequency domain signal is repeatedly mapped to the first symbol and the second symbol, namely the same auxiliary synchronous code repeatedly recurs twice, respectively occupies two symbols, and is separated by one symbol as a protection interval.

The present embodiment employs a method of repeating random sequences to enhance the performance of detection and synchronization. First, the repeated random sequence may increase the likelihood that a node as a receiving end detects the preamble. Because the preamble may be interfered by channel fading, noise and the like in the transmission process, the repeated random sequence can reduce the probability of error detection through the accumulation effect, and the detection performance of the preamble is improved. Therefore, by detecting a plurality of repetitions or adopting a correlation detection method, the position of the preamble can be determined more reliably.

Second, the repeated random sequence may provide a larger time window for synchronization. Synchronization is a process of determining a time offset between two communication side devices and enabling a node as a receiving side to correctly decode data. By increasing the number of repetition codes, more time windows can be provided to calibrate and synchronize the time offset between devices, thereby improving synchronization performance.

When a first node is initially accessed to a second node as a transmitting end as a receiving end, a RACH (Random ACCESS CHANNEL ) process is needed, wherein the process obtains a Random access time offset through a Random access preamble sent by the first node, and finally, an access request is sent according to the Random access time offset information. If the first node does not obtain the accurate uplink timing sent by the second node, the random access preamble sent by the first node may collide with other signal blocks, so that interference is generated. The embodiment inserts guard interval symbols between repeated random sequences to prevent the terminal node from interfering with other signals due to the fact that accurate uplink timing is not obtained in initial access.

As shown in fig. 4, in an exemplary embodiment, the random access preamble includes two guard interval symbols, wherein a first symbol or a second symbol is spaced between the two guard interval symbols.

When a plurality of nodes as a receiving end transmit random access preambles to a second node as a transmitting end at the same time, the random access preambles are consecutively transmitted in a certain time sequence. In order to avoid collision and interference between consecutive random access preambles, the present embodiment sets the random access preambles to at least correspond to 4 symbols, and inserts a guard interval symbol at the end or the beginning of the random access preamble so as to separate different random access preambles, so that a second node serving as a transmitting end can accurately detect and locate different random access preambles, thereby providing reliability and performance of the peer-to-peer communication network.

In one exemplary embodiment, the guard interval symbol may be generated by a broadcast channel stall.

Based on the same inventive concept, in an exemplary embodiment, referring to fig. 5, a signal transmission method in a peer-to-peer communication is provided for a second node in a peer-to-peer communication system, the peer-to-peer communication system further including a first node, the method comprising the following steps 502 to 504. Wherein:

Step 502, under the condition that the second node is used as a transmitting end, acquiring a random access preamble sent by the first node, wherein the random access preamble is acquired by the first node based on a first generation rule, and the first generation rule is further used for the first node to generate a secondary synchronization code based on the first generation rule.

Under the condition that the second node serves as a transmitting end, the second node transmits a second synchronous signal to the first node so that the first node can acquire node information and receiving time offset of the second node; the first node responds to the second synchronous signal and sends a random access preamble to the second node so as to apply for accessing the second node. At this time, the second node acquires the random access preamble and processes the random access preamble to determine a random access time offset in a direction from the first node to the second node.

Step 504, performing secondary synchronization signal detection processing based on the random access preamble, and determining a time offset from the first node to the second node, where the time offset is used by the second node to establish a wireless communication link with the first node based on the time offset.

The random access preamble code and the auxiliary synchronization code are generated according to a first generation rule, so that the random access preamble code can be detected and processed based on a hardware module in the second node for detecting and processing the auxiliary synchronization code in the synchronization signal, and the random access time offset from the first node to the second node is obtained, so that the second node completes uplink time synchronization with the first node, and the establishment of a wireless communication link with the first node is completed.

The signal transmission method in peer-to-peer communication provided in the above embodiment is used for a second node in a peer-to-peer communication system, where the peer-to-peer communication system further includes a first node, where the method includes, when the second node is used as a transmitting end, acquiring a random access preamble sent by the first node, where the random access preamble is acquired by the first node based on a first generation rule, and the first generation rule is further used for the first node to generate a secondary synchronization code based on the first generation rule; performing secondary synchronization signal detection processing based on the random access preamble, and determining time offset from the first node to the second node, wherein the time offset is used for the second node to establish a wireless communication link with the first node based on the time offset; therefore, on the basis of the hardware for detecting the synchronous signal by the second node, the detection processing of the random access preamble can be further realized through software configuration, and the synchronous signal and the receiving and detecting processing process of the random access preamble do not occur simultaneously on the same node, so that the method provided by the embodiment can enable each node in the point-to-point communication network to use the same set of hardware module to realize the detection processing of the synchronous signal and the random access signal with lower cost, and reduce the area of a communication chip.

The present application provides an example of synchronization signal detection in a point-to-point communication technology to illustrate the principles of the signal transmission method provided by the present application. In point-to-point communication, a blind detection mode can be adopted to detect and process the synchronous signals.

Blind detection is a technique for channel estimation and synchronization at a node that is a receiving end, and can identify a synchronization signal without a priori information. The node as the receiving end applies a set of predefined primary and secondary synchronization code sequences for the matching operation, each having specific sequence characteristics from which the positions of the primary and secondary synchronization codes can be identified.

For example, the node as the receiving end performs blind detection on the primary synchronization code, and since the relative time domain positions of the primary synchronization code and the secondary synchronization code are fixed, the secondary synchronization code can be identified based on the specific position of the primary synchronization code. And identifying and decoding the primary synchronous code and the secondary synchronous code, and determining node information corresponding to the node serving as a transmitting end corresponding to the synchronous signal.

Taking the synchronization signal generated under 38.211 protocol as an example, blindly detecting the primary synchronization code and decoding to obtainThen according to the position and/>, of the primary synchronization codeThe position of the secondary synchronization code is identified and decoded to obtain/>According to the formula, the method comprises the steps of,Wherein/>I.e. the identity of the node, to determine the node as the sender. After determining the node as the transmitting end, the frequency offset estimation can be performed, so as to obtain the receiving time offset, and complete clock synchronization and frequency synchronization.

The synchronization signal generated under 38.211 protocol is typically combined with the broadcast signal PBCH to form SSB. After the synchronization signal is identified by the nodes, the SSB is subjected to fast Fourier transform, the time domain signal is converted into the frequency domain signal, the PBCH is extracted and demodulated, and the information including the node information, the system frame number, the frame structure and the like is acquired so as to synchronize and correctly receive and process the data.

In an exemplary embodiment, please refer to fig. 6, based on the embodiment shown in fig. 5, a signal transmission method in peer-to-peer communication is provided, which relates to a process of performing secondary synchronization signal detection processing based on a random access preamble and determining a time offset from a first node to a second node. As shown in fig. 6, the process includes:

Step 602, a plurality of local reference codes are acquired.

For example, the secondary synchronization codes corresponding to all nodes in the peer-to-peer communication system can be generated as the local reference codes according to the mode of generating the secondary synchronization codes; also exemplary, may be pre-implemented in a point-to-point communication system

Step 604, performing correlation operation on the random access preamble and the plurality of local reference sequences, respectively, to obtain a plurality of power delay spectrums.

Wherein the correlation operation is a mathematical operation for similarity comparison of two sequences. For example, taking a sequence length of 127 as an example of a random sequence, let the received random access preamble be y (n), and for each local reference sequence d (n), n is an integer from 0 to 126, and the time domain correlation operation formula is:

；

Wherein W is the detection window length.

The above equation is to obtain a power delay spectrum with a length of (w+1) for the local reference code d (n).

Step 606, determining a target peak value according to the maximum value of the peak values corresponding to the power delay spectrums.

Exemplary, takeThe peak corresponding to the power delay spectrum Corr (m) can be obtained.

Wherein a local reference code corresponds to a peak; the maximum value of the plurality of peaks is determined as a target peak.

And 608, if the target peak value is greater than the preset threshold, obtaining the time offset according to the target peak value and the power delay spectrum corresponding to the target peak value.

Illustratively, the random access time offset may be determined based on the location of the target peak and the sampling rate of the power delay profile.

In one possible implementation manner of this embodiment, if the target peak value is less than or equal to the preset threshold, the random access preamble is considered invalid, which may be caused by noise interference, multipath fading, and other reasons, and the first node serving as the receiving end needs to wait for retransmitting the random access preamble; and possibly also a failure of the second node or a network problem, etc., the second node may be restarted.

The acquisition of the time offset corresponds to acquiring a TA (TIMING ADVANCE ), and correcting the node according to the TA, so as to ensure synchronization as uplink time between the first node and the second node.

It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.

It will be appreciated that the term "based on" as used herein to describe one or more factors that influence a determination is not to be taken as excluding other factors that may influence the determination. For example, the phrase "determining a based on B" means that the determination of a may be based, at least in part, on or entirely on factor B, that is, B is one factor affecting the determination of a, but does not exclude that the determination of a is also based on C.

Based on the same inventive concept, the embodiment of the application also provides a signal transmitting device for realizing the signal transmission method in the point-to-point communication. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiments of the sending device or sending devices provided below may be referred to the limitation of the signal transmission method in the peer-to-peer communication hereinabove, and will not be described herein.

In an exemplary embodiment, referring to fig. 7, a signal transmitting apparatus in a peer-to-peer communication is provided, where the apparatus is used for a first node in a peer-to-peer communication system, and the peer-to-peer communication system further includes a second node, and the apparatus includes a sequence acquisition module, a discrete fourier transform module, and a resource mapping module, where:

The sequence acquisition module is used for responding to a second synchronizing signal sent by the second node under the condition that the first node is a receiving end, acquiring a random sequence based on a first generating rule, and the first generating rule is also used for the first node to generate a secondary synchronizing code based on the first generating rule.

And the discrete Fourier transform module is used for carrying out Fourier transform processing based on the random sequence to obtain a random frequency domain signal.

In an exemplary embodiment, the sequence acquisition module is further configured to acquire, in a case where the first node is a transmitting end, a primary synchronization code based on the second generation rule and a secondary synchronization code based on the first generation rule.

In this embodiment, the discrete fourier transform module is further configured to transparently transmit the primary synchronization code and the secondary synchronization code to the resource mapping module. Wherein the discrete fourier transform module is configured in a bypass (bypass) manner. When the second node is used as the transmitting end to generate the synchronous signal, the working mode of the transmitting device can be set to be a synchronous mode, and the current working mode is represented by a mode identifier in an exemplary manner; when the current working mode is a synchronous mode, the discrete Fourier transform module is not started, and the primary synchronous code and the secondary synchronous code are generated through the sequence acquisition module and then directly sent to the resource mapping module without discrete Fourier processing.

When the second node is used as a receiving end, the working mode of the sending device is a random access mode, the discrete Fourier transform module is started at the moment, after the sequence acquisition module generates the auxiliary synchronous code, the auxiliary synchronous code is changed into a random frequency domain signal by the discrete Fourier transform module, and then the random frequency domain signal is sent into the resource mapping module.

The second resource mapping process refers to that the resource mapping module performs resource mapping according to the structure of the synchronization signal and sends out the resource mapping.

In an exemplary embodiment, the resource mapping module is further configured to repeatedly map the random frequency domain signal onto a first symbol and a second symbol, where the first symbol and the second symbol are separated by a guard interval symbol, to obtain the random access preamble.

In an exemplary embodiment, the random access preamble comprises two guard interval symbols, wherein a first symbol or a second symbol is spaced between the two guard interval symbols.

In one exemplary embodiment, synchronization signals generated under the 38.211 protocol are typically combined with the broadcast signal PBCH to form SSBs. At this time, the transmitting device further includes a PBCH transmitting module. The PBCH sending module comprises a PBCH bit level processing sub-module, a scrambling sub-module and a modulating sub-module. Wherein the PBCH bit-level processing sub-module is responsible for CRC (Cyclic Redundancy Check ), coding, and rate matching operations. When the working mode of the sending device of the second node is synchronous mode, the primary synchronous code and the secondary synchronous code are generated through the sequence acquisition module, and are directly sent to the resource mapping module together with the PBCH generated by the PBCH sending module without discrete Fourier processing, and the resource mapping is carried out according to the structure shown in fig. 3, and SSB is output.

In an exemplary embodiment, please refer to fig. 8, a signal receiving apparatus in peer-to-peer communication is provided, for a second node in a peer-to-peer communication system, where the peer-to-peer communication system further includes a first node, and the apparatus includes a data acquisition module and a secondary synchronization signal detection module, where:

and the data acquisition module is used for acquiring the random access preamble sent by the first node under the condition that the second node serves as a sending end.

In the related art, as shown in fig. 8, the output end of the secondary synchronization signal detection module is connected to the PBCH receiving sub-module in the output module. In one possible implementation manner of this embodiment, when the current working mode of the signal receiving device is random access, the PBCH receiving sub-module directly and transparently transmits the output data of the auxiliary synchronization signal detecting module out of the signal receiving device; in another possible implementation manner, the secondary synchronization signal detection module directly outputs the detection result to the outside of the signal receiving device when the current working mode of the signal receiving device is random access.

In an exemplary embodiment, the apparatus further comprises a primary synchronization signal detection module and an output module, wherein:

And the data acquisition module is also used for acquiring the synchronous signals sent to the second node by other nodes under the condition that the second node serves as a receiving end.

And the main synchronous signal detection module is used for carrying out main synchronous code detection processing based on the synchronous signal to obtain main time offset.

The auxiliary synchronization signal detection module is further used for carrying out auxiliary synchronization code detection processing based on the synchronization signal to obtain auxiliary time offset.

In an exemplary embodiment, the secondary synchronization signal detection module is specifically configured to: and acquiring a plurality of local reference sequences, performing correlation operation on the random access preamble and the plurality of local reference sequences respectively to obtain a plurality of power delay spectrums, determining a target peak value according to the maximum value in the peak values corresponding to the plurality of power delay spectrums, and obtaining time offset according to the target peak value and the power delay spectrums corresponding to the target peak value if the target peak value is larger than a preset threshold.

In one exemplary embodiment, synchronization signals generated under the 38.211 protocol are typically combined with the broadcast signal PBCH to form SSBs. At this time, the output module includes an FFT (Fast Fourier Transform ) sub-module and a PBCH reception sub-module. When the second node is used as a receiving end, if a time domain synchronizing signal is received, the time domain synchronizing signal is sent to a main synchronizing code detection module to obtain a main synchronizing code and coarse timing or coarse frequency offset estimation (namely main time offset); sending the synchronous signal to an auxiliary synchronous code detection module to obtain an auxiliary synchronous code and more accurate frequency offset estimation (namely auxiliary time offset), and positioning a node serving as a transmitting end corresponding to the synchronous signal according to the main synchronous code and the auxiliary synchronous code; and then, after the symbol data of the PBCH is transformed into frequency domain data through an FFT submodule, a PBCH receiving submodule is utilized to determine complete receiving time offset based on the frequency domain data, the main time offset and the auxiliary time offset.

The embodiment utilizes the same set of hardware equipment of the node, and only needs software configuration to distinguish different received signals, so that the node can support the reception of synchronous signals and random access signals, and the cost and the area of the terminal node are greatly reduced.

The respective modules in the signal transmitting apparatus and the signal receiving apparatus in the point-to-point communication described above may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the terminal node, or may be stored in software in a memory in the terminal node, so that the processor may call and execute operations corresponding to the above modules.

In an exemplary embodiment, an end node is provided, the computer device may be a server, and an internal structure thereof may be as shown in fig. 9. The computer device includes a processor, a memory, an Input/Output interface (I/O) and a communication interface. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface is connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is for storing data. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of signal transmission in point-to-point communication.

It will be appreciated by persons skilled in the art that the architecture shown in fig. 9 is merely a block diagram of some of the architecture relevant to the present inventive arrangements and is not limiting as to the computer device to which the present inventive arrangements are applicable, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.

In one exemplary embodiment, a point-to-point communication system is provided that includes a plurality of nodes configured to perform steps for implementing the method embodiments described above.

It will be appreciated that each node in the system may be provided with signal transmitting means and signal receiving means as provided by the above-described device embodiments.

In an exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method embodiments described above.

In an exemplary embodiment, a computer program product is also provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.

It should be noted that, the user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are both information and data authorized by the user or sufficiently authorized by each party, and the collection, use and processing of the related data are required to meet the related regulations.

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims

1. A method of signal transmission in a point-to-point communication, for a first node in a point-to-point communication system, the point-to-point communication system further comprising a second node, the method comprising:

Under the condition that the first node is a receiving end, responding to a second synchronous signal sent by the second node, and acquiring a random sequence based on a first generation rule, wherein the first generation rule is also used for the first node to generate a secondary synchronous code based on the first generation rule;

And sending the random access preamble to the second node for the second node to establish a wireless communication link with the first node based on the random access preamble.

2. The method of claim 1, wherein the performing resource mapping on the random frequency domain signal to obtain a random access preamble comprises:

And repeatedly mapping the random frequency domain signal to a first symbol and a second symbol to obtain the random access preamble, wherein the first symbol and the second symbol are separated by a guard interval symbol.

3. The method of claim 2, wherein the random access preamble comprises two guard interval symbols, wherein the first symbol or the second symbol is spaced between the two guard interval symbols.

4. A method of signal transmission in a point-to-point communication, for a second node in a point-to-point communication system, the point-to-point communication system further comprising a first node, the method comprising:

Acquiring a random access preamble transmitted by the first node under the condition that the second node serves as a transmitting end, wherein the random access preamble is acquired by the first node based on a first generation rule, and the first generation rule is also used for the first node to generate a secondary synchronization code based on the first generation rule;

5. The method of claim 4, wherein the determining the time offset from the first node to the second node direction based on the secondary synchronization signal detection process performed by the random access preamble comprises:

Acquiring a plurality of local reference sequences;

Performing related operation processing on the random access preamble and the local reference sequences respectively to obtain a plurality of power delay spectrums;

And if the target peak value is larger than a preset threshold, obtaining the time offset according to the target peak value and a power delay spectrum corresponding to the target peak value.

6. A signaling apparatus in a point-to-point communication system for a first node in the point-to-point communication system, the point-to-point communication system further comprising a second node, the apparatus comprising:

And the resource mapping module is used for carrying out first resource mapping processing on the random frequency domain signal to obtain a random access lead code, wherein the random access lead code is used for being sent to the second node so that the second node can establish a wireless communication link with the first node based on the random access lead code.

7. The apparatus of claim 6, wherein the sequence acquisition module is further configured to acquire a primary synchronization code based on a second generation rule and a secondary synchronization code based on a first generation rule if the first node is a transmitting end;

The discrete Fourier transform module is further used for transmitting the primary synchronization code and the secondary synchronization code to the resource mapping module;

and the resource mapping module is also used for carrying out second resource mapping processing based on the primary synchronization code and the secondary synchronization code to obtain a first synchronization signal.

8. A signal receiving apparatus in a point-to-point communication system for a second node in the point-to-point communication system, the point-to-point communication system further comprising a first node, the apparatus comprising:

The data acquisition module is used for acquiring a random access preamble sent by the first node under the condition that the second node serves as a sending end, wherein the random access preamble is acquired by the first node based on a first generation rule, and the first generation rule is also used for enabling the first node to generate auxiliary synchronization based on the first generation rule;

And the auxiliary synchronization signal detection module is used for carrying out auxiliary synchronization signal detection processing based on the random access preamble, determining random access time offset from the first node to the second node, wherein the random access time offset is used for the second node to establish a wireless communication link with the first node based on the time offset.

9. The apparatus of claim 8, further comprising a primary synchronization signal detection module and an output module, wherein,

The data acquisition module is further configured to acquire a synchronization signal sent by the other node to the second node when the second node is used as a receiving end;

The auxiliary synchronous signal detection module is further used for carrying out auxiliary synchronous code detection processing based on the synchronous signal to obtain auxiliary time offset;

and the output module is used for processing based on the main time offset and the auxiliary time offset to obtain the receiving time offset from the other nodes to the second node.

10. A point-to-point communication system, characterized in that the system comprises a plurality of nodes for performing the steps of the method according to any of claims 1-5.