Communication method and device

Abstract

Provided are a communication method and device, relating to the technical field of communications, a network device obtaining a synchronization signal block (SSB), the SSB comprising: a physical broadcast channel (PBCH) signal and a synchronization signal, the PBCH signal being obtained by performing single carrier modulation on a physical broadcast channel (PBCH), and the synchronization signal being obtained by performing single carrier modulation on a synchronization sequence; and the network equipment sends the SSB, the terminal receives the SSB, and the terminal demodulates the synchronization signal and the PBCH signal. Since the single carrier modulation can ensure that the signal has a lower peak-to-average power ratio (PAPR), in the application, the PBCH signal and the synchronization signal in the SSB both adopt single carrier modulation, and the SSB can be ensured to have a lower PAPR.

Description

Technical Field

[0001] Embodiments of this application relate to the field of communication technologies, and in particular, to a communication method and apparatus. Background Art

[0002] A user equipment (UE) can communicate with a network device only after accessing a cell. To access the cell, the UE needs to perform cell search (wherein, cell search includes: signal synchronization processing, etc.) to demodulate downlink signals and transmit uplink signals with precise timing.

[0003] Two specially designed synchronization signals are used in signal synchronization processing, namely the primary synchronization signal (PSS) and the secondary synchronization signal (SSS). The network device broadcasts the above synchronization signals on each cell. If the UE detects the above two synchronization signals, the time and frequency of the network device and the UE are synchronized. In addition, during the initial synchronization process, the UE also decodes the physical broadcast channel (PBCH) to obtain key system parameters for better communication with the network device.

[0004] The existing synchronization signal block (SSB) uses orthogonal frequency division multiplexing (OFDM) modulation and has a high peak to average power ratio (PAPR). To ensure the coverage requirements of the communication system, how to ensure that the SSB has a low PAPR, related technologies have not proposed solutions. Summary of the Invention

[0005] This application provides a communication method and apparatus to ensure that the SSB has a low PAPR.

[0006] In a first aspect, the present application provides a communication method, which can be executed through the interaction between a terminal and a network device. Herein, the terminal can be understood as the terminal itself or a chip disposed inside the terminal, which is not specifically limited herein. The terminal can be a mobile phone, a vehicle-mounted device, an Internet of Things device, etc.; the network device can be understood as the network device itself or a chip disposed inside the network device. The network device can be a base station, a satellite, an access point, etc., which is not specifically limited herein; this method can be applied to a 5G communication system or a communication system above 5G, and can also be applied to a non-terrestrial communication system, which is not specifically limited in the present application. In practical applications, the following operations are performed:

[0007] The network device obtains an SSB, where the SSB includes: a PBCH signal and a synchronization signal. The PBCH signal is obtained by performing single-carrier modulation on the PBCH, and the synchronization signal is obtained by performing single-carrier modulation on the synchronization sequence; the network device sends the SSB, the terminal receives the SSB, and the terminal demodulates the synchronization signal and the PBCH signal.

[0008] Since the single-carrier modulation signal can have a lower PAPR than the multi-carrier modulation signal represented by OFDM modulation, in the present application, both the PBCH signal and the synchronization signal in the SSB are modulated by single-carrier modulation to generate an SSB with a low PAPR.

[0009] In an optional manner, the PBCH signal is obtained by performing single-carrier modulation on the PBCH using first modulation parameters, where the first modulation parameters include at least one of the following: the modulation method of the symbol carried by the PBCH, the bandwidth of the PBCH signal, the number of symbols carried by the PBCH, or the first frequency domain spectrum shaping (FDSS) parameter.

[0010] In an optional manner, the synchronization signal is obtained through the following steps:

[0011] The network device maps the synchronization sequence to a π / 2-BPSK symbol sequence based on a π / 2-BPSK modulation mapper; performs single-carrier modulation on the π / 2-BPSK symbol sequence using second modulation parameters to obtain the synchronization signal, where the second modulation parameters include at least one of the following: the bandwidth of the synchronization signal, or the second FDSS parameter.

[0012] Since the phase difference between two adjacent symbols in the π / 2-BPSK symbol sequence is limited to 90 degrees, using the π / 2-BPSK symbol sequence as the input for single-carrier modulation will result in a single-carrier signal with a lower PAPR than using other input symbol sequences (such as the quadrature phase shift keying QPSK symbol sequence). Therefore, the synchronization signal modulated by π / 2-BPSK single-carrier modulation has a low PAPR.

[0013] In an alternative manner, when the modulation mode of the symbols carried by the PBCH is π / 2-BPSK modulation, the bandwidth scaling degree of the synchronization signal is not less than that of the PBCH signal. The bandwidth scaling degree of the synchronization signal is related to the bandwidth of the synchronization signal and the number of symbols in the π / 2-BPSK symbol sequence mapped by the synchronization sequence. The bandwidth scaling degree of the PBCH signal is related to the bandwidth of the PBCH signal and the number of symbols carried by the PBCH.

[0014] By this method, it can be ensured that the PAPR of the modulated synchronization signal is not higher than that of the PBCH signal, the communication coverage range can be improved, and the communication quality can be guaranteed.

[0015] In an alternative manner, the modulation mode of the symbols carried by the PBCH is π / 2-BPSK modulation, and the PBCH signal is obtained by single-carrier modulation of the PBCH using the first FDSS parameter; the synchronization signal is obtained by single-carrier modulation of the synchronization sequence using the second FDSS parameter; the bandwidth scaling degree of the synchronization signal is equal to that of the PBCH signal, the first FDSS parameter is the same as the second FDSS parameter, the bandwidth scaling degree of the synchronization signal is related to the bandwidth of the synchronization signal and the number of symbols in the π / 2-BPSK symbol sequence mapped by the synchronization sequence, and the bandwidth scaling degree of the PBCH signal is related to the bandwidth of the PBCH signal and the number of symbols carried by the PBCH.

[0016] In this method, the PBCH signal and the synchronization signal are modulated using the same FDSS parameter. Then, the synchronization signal can be used as the demodulation reference signal (DMRS) of the PBCH, and there is no need to transmit a dedicated PBCH DMRS, which can reduce the overhead, or the PBCH can indicate more information.

[0017] In an alternative manner, the modulation mode of the symbols carried by the PBCH includes one of the following: QPSK modulation, or offset quadrature phase shift keying OFFSET-QPSK modulation, or π / 2-BPSK modulation.

[0018] In an alternative manner, the synchronization signal is the PSS, and / or the SSS.

[0019] In an alternative manner, the synchronization signal is the PSS, and the synchronization sequence is one of a plurality of preset first synchronization sequences, and the number of the plurality of first synchronization sequences is related to the number of values of the physical layer cell identifier 2 (denoted as ) ; the first target synchronization sequence is used to indicate By this method, during the process of the terminal searching for the PSS, it can obtain

[0020] In an alternative manner, multiple first synchronization sequences are obtained by performing different cyclic shift operations on a preset first base synchronization sequence.

[0021] In this application, multiple first synchronization sequences can be obtained by performing cyclic shift operations on the first base synchronization sequence, so as to indicate and other information through multiple different first synchronization sequences.

[0022] In an alternative manner, the shift amounts of performing different cyclic shift operations on the preset first base synchronization sequence are related to the length of the first target synchronization sequence and the number of values of

[0023] In an alternative manner, the synchronization signal is SSS, the synchronization sequence is a second target synchronization sequence among a preset multiple second synchronization sequences, and the number of the multiple second synchronization sequences is related to the number of values of the physical layer cell identifier 1 (denoted as ); the second target synchronization sequence is used to indicate

[0024] Through this method, during the process of the terminal searching for the SSS, it can obtain

[0025] In an alternative manner, multiple second synchronization sequences are obtained by performing different cyclic shift operations on a preset second base synchronization sequence, or multiple second synchronization sequences are obtained by performing different cyclic shift operations on a preset third base synchronization sequence and performing different cyclic shift operations on a preset fourth base synchronization sequence.

[0026] In this application, more second synchronization sequences can be obtained by performing cyclic shift operations on the second base synchronization sequence, or more second synchronization sequences can be obtained by performing different cyclic shift operations on the third base synchronization sequence and performing different cyclic shift operations on the fourth base synchronization sequence, so as to indicate and other information through multiple different second synchronization sequences.

[0027] In an alternative manner, the shift amounts of performing different cyclic shift operations on the preset second base synchronization sequence, the preset third base synchronization sequence, and the preset fourth base synchronization sequence are all related to the length of the second target synchronization sequence and the number of values of

[0028] Second aspect, embodiments of the present application provide a communication device, which may be a terminal (such as the terminal in the first aspect or a chip disposed inside the terminal), a network device, or a chip disposed inside the network device). The communication device is capable of implementing the functions of the first aspect. For example, the communication device includes modules, units, or means corresponding to the steps involved in the first aspect. The functions, units, or means may be implemented by software, or by hardware, or by hardware executing corresponding software.

[0029] In a possible design, the communication device includes a processing unit and a transceiver unit. The transceiver unit may be used to transmit and receive signals to enable communication between the communication device and other devices. For example, the transceiver unit is used to receive a first message. The processing unit may be used to perform some internal operations of the communication device. The transceiver unit may be referred to as an input / output unit, a communication unit, etc., and the transceiver unit may be a transceiver. The processing unit may be a processor. When the communication device is a module (such as a chip) in a communication device, the transceiver unit may be an input / output interface, an input / output circuit, or an input / output pin, etc., and may also be referred to as an interface, a communication interface, or an interface circuit, etc. The processing unit may be a processor, a processing circuit, or a logic circuit, etc.

[0030] In another possible design, the communication device includes a processor and may further include a transceiver. The transceiver is used to transmit and receive signals, and the processor executes program instructions to complete the method in any possible design or implementation manner in the first aspect. The communication device may further include one or more memories, which are used to be coupled to the processor. The memories may store necessary computer programs or instructions for implementing the functions involved in the first aspect. The processor may execute the computer programs or instructions stored in the memories. When the computer programs or instructions are executed, the communication device implements the method in any possible design or implementation manner in the first aspect.

[0031] In another possible design, the communication device includes a processor, and the processor may be used to be coupled to a memory. The memory may store necessary computer programs or instructions for implementing the functions involved in the first aspect. The processor may execute the computer programs or instructions stored in the memory. When the computer programs or instructions are executed, the communication device implements the method in any possible design or implementation manner in the first aspect.

[0032] In another possible design, the communication device includes a processor and an interface circuit. The processor is used to communicate with other devices through the interface circuit and execute the method in any possible design or implementation manner in the first aspect.

[0033] Understandably, in the above second aspect, the processor can be implemented by hardware or software. When implemented by hardware, the processor can be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor can be a general-purpose processor that realizes its function by reading software code stored in the memory. In addition, the above-mentioned processor can be one or more, and the memory can be one or more. The memory can be integrated with the processor, or the memory and the processor can be separately arranged. In the specific implementation process, the memory can be integrated with the processor on the same chip, or can be separately arranged on different chips. The embodiments of the present application do not limit the type of the memory and the setting manner of the memory and the processor.

[0034] In a third aspect, an embodiment of the present application provides a communication system, which includes the terminal and the network device in the first aspect above.

[0035] In a fourth aspect, the present application provides a chip system, which includes a processor and may further include a memory, and is used to implement the method described in the first aspect above. The chip system can be composed of chips, or can include chips and other discrete devices.

[0036] In a fifth aspect, the present application further provides a computer-readable storage medium, in which computer-readable instructions are stored. When the computer-readable instructions run on a computer, the computer is caused to execute the method in the first aspect.

[0037] In a sixth aspect, the present application provides a computer program product containing instructions, which when running on a computer, causes the computer to execute the methods in the respective embodiments of the first aspect.

[0038] For the technical effects that can be achieved in the second to sixth aspects above, please refer to the technical effects that can be achieved in the corresponding possible design solutions in the first aspect. The present application will not repeat them here. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Shows a schematic diagram of a communication system provided by an embodiment of the present application;

[0040] Figure 2 Shows a schematic diagram of the frequency response corresponding to different roll-offs;

[0041] Figure 3 Shows a schematic diagram of bandwidth expansion;

[0042] Figure 4 Shows a schematic diagram of the structure of SSB;

[0043] Figure 5The flowchart of a communication method provided by an embodiment of the present application is shown;

[0044] Figure 6 The schematic diagram of a bandwidth scaling degree provided by an embodiment of the present application is shown;

[0045] Figure 7 The schematic diagram of the structure of a communication device provided by an embodiment of the present application is shown;

[0046] Figure 8 The schematic diagram of the structure of a communication device provided by an embodiment of the present application is shown;

[0047] Figure 9 The schematic diagram of the structure of a communication device provided by an embodiment of the present application is shown. Detailed implementation manners

[0048] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. The specific operation methods in the method embodiments can also be applied to the device embodiments or system embodiments. Among them, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. Therefore, the implementations of the device and the method can be referred to each other, and the repeated parts will not be described again.

[0049] The technical solutions provided in the embodiments of this application can be applied to 5G systems, or to future communication systems or other similar communication systems. Additionally, the technical solutions provided in the embodiments of this application can be applied to cellular links, public land mobile networks (PLMNs), machine to machine (M2M) networks, internet of things (IoT) networks, or other networks. They can also be applied to links between devices, such as device to device (D2D) links. A D2D link can also be referred to as a sidelink, where the sidelink can also be called a side link or a secondary link, etc. In the embodiments of this application, the above terms all refer to links established between devices of the same type, and they have the same meaning. The so-called devices of the same type can be links between terminal devices, links between base stations, or links between relay nodes, etc. The embodiments of this application do not limit this. For the link between terminal devices, there is the D2D link defined in Release (Rel)-12 / 13 of the third generation partnership project (3GPP), and there is also the vehicle to vehicle, vehicle to phone, or vehicle to any entity V2X link defined by 3GPP for vehicle networking, including Rel-14 / 15. It also includes V2X links based on the new radio (NR) system in Rel-18 and subsequent versions, etc.

[0050] Reference Figure 1 is a schematic diagram of a wireless communication system applicable to the present invention. The wireless communication system may include at least one network device, such as Figure 1 the network devices 111, 112, and 113 shown. The wireless communication system may further include at least one terminal device, such as Figure 1 the terminal devices 121, 122, 123, 124, 125, 126, and 127 shown. Communication can occur between the network device and the terminal device, such as Figure 1 the multi-site transmission shown, such as communication can occur between network device 112 and terminal devices 121, 122, and 123; or Figure 1 the enhanced mobile broadband (eMBB) transmission shown, such as network devices 112 and 113 can communicate with terminal device 124. Communication can also occur between network devices, such as Figure 1The feedback shown, for example, the network device 111 can communicate with the network device 112 and the network device 113. Communication can also occur between terminal devices, such as Figure 1 the D2D transmission shown, for example, the terminal device 122 can communicate with the terminal device 125.

[0051] The terminal device can be a wireless terminal device capable of receiving scheduling and indication information from a network device. The wireless terminal device can be a device that provides voice and / or data connectivity to users, or a handheld device with wireless connection capabilities, or other processing devices connected to a wireless modem. The wireless terminal device can communicate with one or more core networks or the Internet via a radio access network (e.g., radio access network, RAN). The wireless terminal device can be a mobile terminal device, such as a mobile phone (or "cellular" phone, mobile phone), computer, and data card. For example, it can be a portable, pocket-sized, handheld, computer-integrated, or vehicle-mounted mobile device that exchanges voice and / or data with the radio access network. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, PDAs, tablets (Pad), computers with wireless transceiver functions, etc. The wireless terminal device can also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile station (MS), remote station, access point (AP), remote terminal device, access terminal device, user terminal device, user agent, subscriber station (SS), customer premises equipment (CPE), terminal, user equipment (UE), mobile terminal (MT), etc. The wireless terminal device can also be a wearable device and the next-generation communication system. For example, the terminal device in a 5G network or the terminal device in a future evolved public land mobile network (PLMN) network, the terminal device in an NR communication system, etc.

[0052] A network device is an entity in the network side that is used to transmit or receive signals, such as a TRP or a gNB. A network device can be a device for communicating with a mobile device. A network device can be an AP in a wireless local area network (WLAN), a base transceiver station (BTS) in a global system for mobile communication (GSM) or a code division multiple access (CDMA), a base station (NodeB, NB) in a wideband code division multiple access (WCDMA), an evolved base station (evolutional Node B, eNB or eNodeB) in a long term evolution (LTE), or a relay station or an access point, or a vehicle-mounted device, a wearable device, and a network device in a future 5G network or a network device in a future evolved PLMN, or a gNodeB / gNB in an NR system, etc.; in some deployments, a gNB can include a centralized unit (CU) and a DU. A gNB can also include an active antenna unit (AAU). The CU implements some functions of the gNB, and the DU implements some functions of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, such as implementing radio resource control (RRC), service data adaptation protocol (SDAP) functions, and the functions of the packet data convergence protocol (PDCP) layer. The DU is responsible for processing physical layer protocols and real-time services, such as implementing the functions of the radio link control (RLC) layer, the medium access control (MAC) layer, and the physical (PHY) layer. The AAU implements some physical layer processing functions, radio frequency processing, and related functions of active antennas. Since the information in the RRC layer will ultimately become the information in the PHY layer, or is transformed from the information in the PHY layer, thus, in this architecture, high-layer signaling, such as RRC layer signaling, can also be considered to be sent by the DU, or sent by the DU and the AAU. It can be understood that a network device can be a device including one or more of a CU node, a DU node, and an AAU node.In addition, the CU can be divided into network devices in the radio access network (RAN), or the CU can be divided into network devices in the core network (CN). This application does not make any limitations in this regard. Additionally, in the embodiments of this application, the network device provides services for a cell, and the terminal device communicates with the network device through the transmission resources used by this cell (for example, frequency domain resources, or in other words, spectrum resources). This cell can be the cell corresponding to the network device (such as a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. Here, small cells can include: Metro cell, Micro cell, Pico cell, Femto cell, etc. These small cells have the characteristics of small coverage range and low transmission power, and are suitable for providing high-rate data transmission services. In addition, in other possible cases, the network device can be other devices that provide wireless communication functions for the terminal device. The embodiments of this application do not make any limitations on the specific technologies and specific device forms adopted by the network device. For the convenience of description, in the embodiments of this application, the device that provides wireless communication functions for the terminal device is referred to as the network device.

[0053] To better illustrate the solution of this application, the following explains the technical terms involved in this application:

[0054] 1) π / 2-BPSK modulation

[0055] Section 5.1.1 of NR protocol 38.211 defines π / 2-BPSK modulation as shown in the following formula 1:

[0056]

[0057] Among them, b(i) represents the i-th bit, and d(i) represents the modulation symbol, that is, the i-th symbol in the π / 2-BPSK symbol sequence, and j 2 = 1. Next, analyze the frequency domain signal corresponding to the π / 2-BPSK symbol sequence. Assume that the π / 2-BPSK symbol sequence {d(i)} contains N symbols. Performing an N-point discrete Fourier transform (DFT) on {d(i)} can obtain the corresponding frequency domain signal, denoted as y(k), where k = 0, 1,..., N - 1.

[0058] Among them, y(k) has the following properties, which can be seen in formula 2:

[0059]

[0060]

[0061] Among them, the superscript * represents the complex conjugate operation. Therefore, there are redundant signals in y(k), k = 0, 1, …, N−1. After removing these redundant signals, y(k), k = 0, 1, …, N−1 can still be recovered using the remaining signals in combination with the above relationship.

[0062] If, before performing the DFT, a phase rotation as shown in Equation 3 is performed on {d(i)}, we get

[0063]

[0064] Then, performing an N-point DFT on results in the frequency-domain signal

[0065] which has the following properties, as can be seen in Equation 4:

[0066]

[0067]

[0068] Therefore, has redundant signals. After removing these redundant signals, can still be recovered using the remaining

[0069] 2) Reducing the PAPR of single-carrier signals using bandwidth scaling and FDSS

[0070] Before introducing the specific technology, first introduce the concepts of roll-off and spectrum extension factor. Roll-off is the steepness of the frequency response function with respect to frequency. Figure 2 The frequency responses for different roll-offs (β = 0, 0.25, 0.5, 1) are given. It can be seen that the frequency response with a rectangular shape is the steepest. In practice, it is difficult to implement a filter with a rectangular window frequency response. Using roll-off can reduce the filter implementation difficulty, but it increases the bandwidth. The roll-off factor is defined by Equation 5 below:

[0071]

[0072] where the bandwidth without roll-off corresponds to the bandwidth when β = 0. Combining Figure 2 , it can be seen that when β = 1, the bandwidth doubles. When β = 0.5, the bandwidth increases by 50%.

[0073] In addition, regarding spectrum / bandwidth extension, there is also the following definition of the spectrum / bandwidth extension factor, which is defined by the following formula 6:

[0074]

[0075] For example, if β = 1, the spectrum / bandwidth extension factor is 0.5; if β = 0.5, the spectrum / bandwidth extension factor is 1 / 3.

[0076] Due to the use of a pulse shaping filter with roll-off, the time-domain linear convolution SC modulated signal has a lower PAPR than the DFT-s-OFDM signal. For DFT-s-OFDM, it can also utilize roll-off (or spectrum / bandwidth extension) and FDSS to achieve PAPR reduction. Figure 3 It is a schematic diagram of DFT-s-OFDM modulation with bandwidth extension and FDSS processing provided by an embodiment of this application. Among them, the symbol sequence undergoes DFT processing to obtain the frequency-domain signal S k , which serves as the input to the bandwidth extension module. Figure 3 A bandwidth extension implementation method is also given: The tail part signal of S k is copied to the front of S k , and the head part signal of S k is copied to the back of S k . The signal output by the bandwidth extension module serves as the input to the FDSS module. The output of the FDSS module is equal to the input multiplied by the FDSS coefficient, and then operations such as subcarrier mapping, inverse discrete Fourier transform (IDFT), and adding a cyclic prefix (CP) are performed. For example, after bandwidth extension, the obtained signal its i-th value is The FDSS output signal the i-th value is and The relationship between them conforms to the following formula 7:

[0077]

[0078] where c[i] is the i-th FDSS coefficient.

[0079] 3) SSB

[0080] In the 5G mobile communication system, the synchronization signal is transmitted together with the PBCH signal to form an SS / PBCH block, simply referred to as an SSB. The SSB described in the embodiments of this application may also refer to the SS / PBCH block. Among them, the synchronization signal (synchronization signal block, SS) includes the PSS and the SSS.

[0081] As Figure 4 shown, in the time domain, 1 SSB occupies 4 orthogonal frequency division multiplexing (OFDM) symbols, namely symbols 0 to 3. In the frequency domain, 1 SSB occupies 20 resource blocks (RB) (one RB includes 12 subcarriers), that is, 240 subcarriers, and the subcarrier numbers are 0 to 239. The PSS is located on the middle 127 subcarriers of symbol 0, and the SSS is located on the middle 127 subcarriers of symbol 2. To protect the PSS and the SSS, subcarriers are left on both sides of the PSS and the SSS as guard subcarriers. For example, Figure 4 the blank areas on both sides of the SSS in

[0082] are the guard subcarriers. The guard subcarriers are not used to carry signals. The PBCH occupies all the subcarriers of symbols 1 and 3, and a part of the remaining subcarriers (that is, the subcarriers other than the guard subcarriers) among all the subcarriers of symbol 2 except for the subcarriers occupied by the SSS. The PSS can be used to indicate the physical layer cell identity 2 (denoted as ), and the SSS can be used to indicate the physical layer cell identity 1 (denoted as and together determine multiple physical cell identities (PCI) in the 5G communication system. Once the terminal successfully searches for the PSS and the SSS, it knows the physical cell identity of this 5G carrier, and thus has the ability to parse the system message included in the SSB.

[0083] The existing SSB is modulated using OFDM and has a high PAPR. To ensure the coverage requirements of the communication system, there is no solution proposed in the related art on how to ensure that the SSB has a low PAPR. Based on this, this application provides a communication method to ensure that the SSB has a low PAPR. Refer to Figure 5, which can be executed through the interaction between the terminal and the network device. Here, the terminal can be understood as the terminal itself or a chip set inside the terminal, which is not specifically defined here. The terminal can be a mobile phone, a vehicle-mounted device, an Internet of Things device, etc.; the network device can be understood as the network device itself or a chip set inside the network device. The network device can be a base station, a satellite, an access point, etc.; this method can be applied to a 5G communication system or a communication system above 5G, and can also be applied to a non-terrestrial communication system. This application is not specifically defined here. In actual application, the following operations are performed:

[0084] Step 501, the network device obtains the SSB. The SSB includes: a PBCH signal and a synchronization signal. The PBCH signal is obtained by performing single-carrier modulation on the PBCH, and the synchronization signal is obtained by performing single-carrier modulation on the synchronization sequence.

[0085] Referring to the above Figure 4 It can be known that the SSB includes a PBCH signal and a synchronization signal (PSS and SSS). In this application, the network device can obtain the PBCH signal by performing single-carrier modulation on the PBCH, and can also reuse the PBCH signal modulated by other network devices. For example, if base station 1 and base station 2 are co-deployed and base station 1 has already generated the PBCH signal, then base station 2 can directly obtain the PBCH signal through data interaction with base station 1 without performing single-carrier modulation on the PBCH, which can reduce the data processing operations of base station 2 and improve the data processing efficiency. In this application, the network device can obtain the synchronization signal by performing single-carrier modulation on the synchronization sequence (the synchronization sequence is constructed by one of the following: m-sequence, gold sequence, or Golay sequence, which is not specifically defined here). The network device can also reuse the synchronization signal modulated by other network devices. The description of the PBCH signal can be referred to and will not be elaborated here. Among them, single-carrier modulation techniques include, for example, DFT-s-OFDM modulation, time-domain linear convolution single-carrier (SC) modulation, SC-FDE (single-carrier frequency-domain equalization), etc., which are not specifically defined here.

[0086] Of course, in actual application, the above 1) and 2) can also be combined for further processing when performing single-carrier modulation on the PBCH and the synchronization sequence (different synchronization sequences can be used for different synchronization signals) to reduce the PAPR of the PBCH signal and the synchronization signal. Next, single-carrier modulation will be described in combination with 1) and 2).

[0087] Specifically, the PBCH signal is obtained by performing single-carrier modulation on PBCH using a first modulation parameter, where the first modulation parameter includes at least one of the following: the modulation method of the symbols carried by PBCH, the bandwidth of the PBCH signal, the number of symbols carried by PBCH, or the first FDSS parameter. Among them, the modulation method of the symbols carried by PBCH includes one of the following: QPSK modulation, or OFFSET-QPSK modulation, or π / 2-BPSK modulation.

[0088] In an alternative manner, the network device maps the synchronization sequence to a π / 2-BPSK symbol sequence based on a π / 2-BPSK modulator; performs single-carrier modulation on the π / 2-BPSK symbol sequence using a second modulation parameter to obtain a synchronization signal, where the second modulation parameter includes at least one of the following: the bandwidth of the synchronization signal, or the second FDSS parameter. Since the phase difference between two adjacent symbols in the π / 2-BPSK symbol sequence is limited to 90 degrees, using the π / 2-BPSK symbol sequence as the input of single-carrier modulation will result in a lower PAPR for the single-carrier signal compared to using other input symbol sequences (such as the QPSK symbol sequence). Therefore, the synchronization signal using π / 2-BPSK single-carrier modulation has a low PAPR.

[0089] In addition, in practical applications, the synchronization signal has a lower PAPR than the PBCH signal, which is beneficial to improving the coverage of the communication system. Specifically, when the modulation method of the symbols carried by PBCH is QPSK modulation or OFFSET-QPSK modulation, and the synchronization sequence uses π / 2-BPSK modulation, it can be ensured that the PAPR of the synchronization signal is not higher than that of the PBCH signal. When the modulation method of the symbols carried by PBCH is π / 2-BPSK modulation, if the bandwidth expansion degree of the synchronization signal is not less than (greater than or equal to) that of the PBCH signal or the bandwidth compression degree of the synchronization signal is not higher than (less than or equal to) that of the PBCH signal, it can be ensured that the PAPR of the modulated synchronization signal is not higher than that of the PBCH signal. The compression situation needs to be considered because there is redundancy in the frequency-domain signal corresponding to the π / 2-BPSK symbol sequence, and removing this part of the redundancy can still recover the complete frequency-domain signal, realizing the improvement of spectral efficiency without loss of transmission performance. The process of removing this part of the redundancy can be understood as bandwidth compression. For example, Figure 6 as shown in (a), the initial bandwidth of the synchronization signal is W1, and after bandwidth expansion processing, the bandwidth expands to 1.5W1. Then the bandwidth expansion degree of the synchronization signal is 50.0% (1.5 - 1 = 0.5). The initial bandwidth of the PBCH signal is W2, and after bandwidth expansion processing, the bandwidth expands to 4 / 3W2. Then the bandwidth expansion degree of the PBCH signal is 33.3% (4 / 3 - 1 = 1 / 3). Then the bandwidth expansion degree of the synchronization signal is greater than that of the PBCH signal;Figure 6 As shown in (b), the initial bandwidth of the synchronization signal is W1. After bandwidth compression processing, the bandwidth is compressed to 2 / 3W1. Then the bandwidth compression degree of the synchronization signal is 33.3% (1 - 2 / 3 = 1 / 3). The initial bandwidth of the PBCH signal is W2. After bandwidth compression processing, the bandwidth is compressed to 0.5W2. Then the bandwidth compression degree of the PBCH signal is 50% (1 - 0.5 = 0.5). Thus, the bandwidth compression degree of the synchronization signal is less than that of the PBCH signal.

[0090] As mentioned above, the bandwidth scaling (expansion or compression) degree of the synchronization signal is related to the bandwidth of the synchronization signal and the number of symbols in the π / 2-BPSK symbol sequence mapped by the synchronization sequence (that is, the bandwidth scaling degree of the synchronization signal can be determined with reference to the bandwidth of the synchronization signal and the number of symbols in the π / 2-BPSK symbol sequence mapped by the synchronization sequence. In addition, for π / 2-BPSK modulation, since one bit is mapped to one π / 2-BPSK symbol, when describing the number of symbols in the π / 2-BPSK symbol sequence, it can also be replaced by describing the length of the synchronization sequence. Therefore, the bandwidth scaling degree of the synchronization signal is related to the bandwidth of the synchronization signal and the length of the synchronization sequence), and the bandwidth scaling degree of the PBCH signal is related to the bandwidth of the PBCH signal and the number of symbols carried by the PBCH (that is, the bandwidth scaling degree of the PBCH signal can be determined with reference to the bandwidth of the PBCH signal and the number of symbols carried by the PBCH).

[0091] Specifically, the bandwidth scaling degree of the synchronization signal can be determined with reference to Formula 8 (which can be understood as the bandwidth scaling degree of PSS, and can also be understood as the bandwidth scaling degree of SSS, and is not specifically limited here), and the bandwidth scaling degree of the PBCH signal can be determined with reference to Formula 9:

[0092]

[0093] Among them, α1 indicates the bandwidth scaling degree of the synchronization signal; ΔF1 indicates the number of subcarriers corresponding to the bandwidth of the synchronization signal; N1 indicates the number of symbols in the π / 2-BPSK symbol sequence or the length of the synchronization sequence, and γ1 is a constant, which can be 1, -1, etc. In actual applications, the value of γ1 can also be flexibly adjusted. For example, in actual production applications, it is inclined to use the positive or negative nature of α1 to judge bandwidth expansion and bandwidth compression, that is, when α1 is greater than zero, it corresponds to bandwidth expansion, and when α1 is less than zero, it corresponds to bandwidth compression. To meet this requirement, γ1 can be set to 1.

[0094]

[0095] Among them, α2 indicates the bandwidth scaling degree of the PBCH signal; ΔF2 indicates the number of subcarriers corresponding to the PBCH bandwidth; N2 indicates the number of symbols in the symbol sequence obtained after the PBCH is modulated by the PBCH symbol. For example, in actual production applications, it is inclined to use the positive or negative nature of α2 to judge bandwidth expansion and bandwidth compression, that is, α2 greater than zero corresponds to bandwidth expansion, and α2 less than zero corresponds to bandwidth compression. To meet this requirement, γ1 can be set to 1. In the above formulas 8 and 9, the value of γ1 is the same.

[0096] Assuming that π / 2-BPSK modulation is adopted and γ1 = 1, combined with 1), it can be known that if the phase rotation as shown in formula 3 is performed on the π / 2-BPSK symbol sequence before DFT, the minimum bandwidth compression degree can reach -0.5.

[0097] To ensure that the PAPR of the synchronization signal is not higher than that of the PBCH signal, the bandwidth scaling degree of the synchronization signal is usually not less than that of the PBCH signal (equivalent to the bandwidth expansion degree of the above synchronization signal being greater than or equal to that of the PBCH signal, and the bandwidth compression degree of the above synchronization signal being less than or equal to that of the PBCH signal).

[0098] In addition, when the modulation method of the symbols carried by the PBCH is π / 2-BPSK modulation, the PBCH signal is obtained by single-carrier modulation of the PBCH using the first FDSS parameter; the synchronization signal is obtained by single-carrier modulation of the synchronization sequence using the second FDSS parameter; the bandwidth scaling degree of the synchronization signal is equal to that of the PBCH signal, and the first FDSS parameter is the same as the second FDSS parameter. In this method, the PBCH signal and the synchronization signal are modulated using the same FDSS parameter, so the synchronization signal can be used as the DMRS of the PBCH, eliminating the need to send a dedicated PBCH DMRS, reducing overhead, or the PBCH can indicate more information.

[0099] Step 502, the network device sends the SSB. Correspondingly, the terminal receives the SSB.

[0100] Step 503, the terminal demodulates the synchronization signal and the PBCH signal.

[0101] Specifically, after the terminal demodulates the synchronization signal and the PBCH signal, signal synchronization between the terminal and the network device can be better achieved. In addition, in actual applications, to improve the coverage of the cell, π / 2-BPSK single-carrier modulation can also be adopted for reference signals such as CSI-RS, SRS, TRS, PRS, and RACH.

[0102] In this application, since the single - carrier modulated signal can have a lower PAPR than the multi - carrier modulated signal represented by OFDM modulation, in this application, both the PBCH signal and the synchronization signal in the SSB adopt single - carrier modulation to generate an SSB with a low PAPR.

[0103] Referring to the above 3), among them, the PSS can be used to indicate The SSS can be used to indicate and Together, they determine multiple PCIs in the 5G communication system. Once the terminal successfully searches for the PSS and the SSS, it knows the physical cell ID of this 5G carrier, and thus has the ability to parse the system message contained in the SSB. Next, it will be described in different cases how to indicate the physical layer cell identifier through the synchronization sequence for different synchronization signals.

[0104] Case 1 When the synchronization signal is the PSS

[0105] The synchronization sequence is a first target synchronization sequence among a preset plurality of first synchronization sequences, and the number of the plurality of first synchronization sequences is related to the number of value - taking of

[0106] For example, if the number of value - taking of is N1, then the number of the first synchronization sequences is also N1. In practical applications, one synchronization sequence (i.e., the first target synchronization sequence) among the N1 first synchronization sequences can be selected and modulated by single - carrier to obtain the PSS, and can be indicated through this first synchronization sequence. The above - mentioned plurality of first synchronization sequences can also be obtained by performing different cyclic shift processes on a preset first base synchronization sequence, and the shift amount is related to That is, the PSS is related to through the design of the cyclic shift amount.

[0107] In this application, the shift amount of performing different cyclic shift processes on the preset first base synchronization sequence is related to the length of the first target synchronization sequence and the number of value - taking of

[0108]

[0109] Or,

[0110]

[0111] Or,

[0112]

[0113] Wherein, Indicates rounding up; Indicates rounding down; round(·) indicates rounding; N1 indicates the length of the first target synchronization sequence; P PSS Indicates The number of values taken by; 0 ≤ i ≤ P PSS -1; N1 ≥ P PSS . It should be understood that on the basis that the shift amount is less than N1, a constant can also be added to the above formulas 10-12 (such as ), for example Wherein, X1 is an integer.

[0114] For example, the length of the first target synchronization sequence is 127, while The number of values that can be taken is 3, then the shift amount can be 0, 43, 86 (using rounding up) or 0, 42, 84 (using rounding down or rounding). If the length of the first target synchronization sequence is 511, while The number of values that can be taken is 4, then the cyclic shift amount can be 0, 128, 256, 384 (using rounding up or rounding) or 0, 127, 254, 381 (using rounding down).

[0115] In addition, different first synchronization sequences can also be used to indicate different Values. For example, P PSS = 3, using three different m-sequences. Different m-sequences have different generating polynomials, and the initial values of the m-sequences can be the same or different. It should be understood that assuming s 0 And s 1 Are two m-sequences with the same generating polynomial but different initial values. If the length N of the two sequences is equal to 2 to the power of minus 1, such as 127, then s 1 Can be considered a cyclic shift of s 0 . At this time, it cannot be said that s 0 And s 1 Are two different first synchronization sequences.

[0116] As mentioned above, it is possible to use the synchronization signal, i.e., PSS, as the PBCH DMRS, so that there is no need to design the PBCH DMRS separately. At this time, the PSS may also need to indicate the SSB index information.

[0117] Case 2 The synchronization signal is the SSS

[0118] The synchronization sequence is a second target synchronization sequence among a plurality of preset second synchronization sequences, and the number of the plurality of second synchronization sequences is related to the number of values of For example, if the number of values of is N2, then the number of second synchronization sequences is also N2. In actual applications, one synchronization sequence among the N2 second synchronization sequences can be selected and modulated by a single carrier to obtain the SSS, and can be indicated by this second synchronization sequence

[0119] Different second target synchronization sequences can be used to indicate different values. For example, the second target synchronization sequence is an NR gold sequence or a Golay sequence, and different NR gold sequences or Golay sequences can have different initial values. The number of initial values is the same as the number of values that can be taken.

[0120] Similar to the above-mentioned first synchronization sequence, the plurality of second synchronization sequences can also be obtained by performing different cyclic shift processes on a preset second basic synchronization sequence.

[0121] In this application, the shift amounts for performing different cyclic shift processes on the preset second basic synchronization sequence and the preset third basic synchronization sequence are both related to the length of the second target synchronization sequence, the number of values of. The shift amounts conform to the following formulas 13, 14, and 15:

[0122]

[0123] Or,

[0124]

[0125] Or,

[0126]

[0127] Among them, indicates rounding up; indicates rounding down; round(·) indicates rounding; N2 indicates the length of the second target synchronization sequence; P SSS indicates The number of values; 0 ≤ i ≤ P SSS -1; N2 ≥ P SSS .

[0128] For example, the length of the second target synchronization sequence is 511, and the number of values it can take is 335. Using floor function, the shift amount can be 0, 1, 2, …, 335.

[0129] It should be understood that on the basis that the shift amount is less than N2, a constant can also be added to the shift amount in the above formulas 13 - 15 (such as ), for example where X2 is an integer.

[0130] Due to the periodicity of cyclic shift, a sequence of length N can generate at most N different sequences of length N through cyclic shift. Therefore, when N2 < P SSS , cyclic shift of the second base synchronization sequence is not sufficient to generate P SSS second synchronization sequences. In this case, in the present application, multiple second synchronization sequences can also be obtained by performing different cyclic shift processes on a preset third base synchronization sequence and performing different cyclic shift processes on a preset fourth base synchronization sequence. The third base synchronization sequence cannot be obtained from the fourth base synchronization sequence through cyclic shift. For example, the lengths of the third base synchronization sequence and the fourth base synchronization sequence are both N2, which is the same as the length of the second synchronization sequence. The third base synchronization sequence undergoes a cyclic shift process to obtain the third sequence, while the fourth base synchronization sequence undergoes a cyclic shift process to obtain the fourth sequence. The second synchronization sequence can be, for example, the modulo-two sum of the third sequence and the fourth sequence.

[0131] Assume that the third base synchronization sequence and the fourth base synchronization sequence are respectively denoted as s 0 , s 1 , then through the cyclic shift combination (m 0 of the third sequence (corresponding to the cyclic shift amount of m 0 of s 1 and the fourth sequence (corresponding to the cyclic shift amount of m 1 of s 0 , m 1 ) indicates as shown in the following formula 16:

[0132] c(n) = (s 0 ((n + m 0 ) mod N) + s 1 ((n + m 1 ) mod N)) mod 2

[0133]

[0134]

[0135] 0 ≤ n < N - 1

[0136] wherein, the integer d is equal to P SSS / P PSS , a is a positive integer, equal to the maximum value that can be taken plus 1. It should be noted that a proper design of the positive integer b can reduce the correlation between SSS sequences in the presence of residual frequency offset. Additionally, if the PSS uses s 0 and its cyclic shift indication m 0 related to can reduce the probability of PCI detection errors.

[0137] It should be understood that if the lengths of the third primary synchronization sequence and the fourth primary synchronization sequence are both N, and the third primary synchronization sequence cannot be obtained from the fourth primary synchronization sequence by cyclic shift, then there are at most N squared second synchronization sequences.

[0138] As mentioned above, it is possible to use the synchronization signal, i.e., SSS, as the PBCH DMRS, thus eliminating the need for a separate PBCH DMRS. In the existing NR protocol, the PBCH DMRS indicates some or all of the SSB index information. At this time, if the SSS is used as the PBCH DMRS, the SSS may also need to indicate some or all of the SSB index information.

[0139] The above mainly introduces the solution provided by the embodiments of the present application from the perspective of device interaction. It can be understood that, in order to implement the above functions, each device may include a corresponding hardware structure and / or software module for executing each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein, the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving the hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0140] The embodiments of the present application can divide the device into functional units according to the above method examples. For example, each functional unit can be divided corresponding to each function, or two or more functions can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0141] In the case of adopting an integrated unit, Figure 7shows a possible exemplary block diagram of a communication device involved in an embodiment of the present application. As Figure 7 shown, the communication device 700 may include: a processing unit 701 and a transceiver unit 702. The processing unit 701 is used to control and manage the operations of the communication device 700. The transceiver unit 702 is used to support the communication between the communication device 700 and other devices. Optionally, the transceiver unit 702 may include a receiving unit and / or a transmitting unit, which are respectively used to perform receiving and transmitting operations. Optionally, the communication device 700 may further include a storage unit, which is used to store the program code and / or data of the communication device 700. The transceiver unit may be referred to as an input / output unit, a communication unit, etc., and the transceiver unit may be a transceiver; the processing unit may be a processor. When the communication device is a module (such as a chip) in a communication device, the transceiver unit may be an input / output interface, an input / output circuit, or an input / output pin, etc., and may also be referred to as an interface, a communication interface, or an interface circuit, etc.; the processing unit may be a processor, a processing circuit, or a logic circuit, etc. Specifically, the device may be the above-mentioned terminal device, network device, etc.

[0142] In one embodiment, the communication device 700 is a network device, and the processing unit 701 is used to obtain an SSB, where the SSB includes: a PBCH signal and a synchronization signal. The PBCH signal is obtained by performing single-carrier modulation on the PBCH, and the synchronization signal is obtained by performing single-carrier modulation on the synchronization sequence; the transceiver unit 702 is used to transmit the SSB.

[0143] In another embodiment, the communication device 700 is a terminal, and the transceiver unit 702 is used to receive an SSB, where the SSB includes: a PBCH signal and a synchronization signal. The PBCH signal is obtained by performing single-carrier modulation on the PBCH, and the synchronization signal is obtained by performing single-carrier modulation on the synchronization sequence; the processing unit 701 is used to demodulate the synchronization signal and the PBCH signal.

[0144] In an optional manner, the PBCH signal is obtained by performing single-carrier modulation on the PBCH using first modulation parameters, where the first modulation parameters include at least one of the following: the modulation method of the symbols carried by the PBCH, the bandwidth of the PBCH signal, the number of symbols carried by the PBCH, or the first FDSS parameter.

[0145] In an optional manner, the processing unit 701 of the network device is specifically used to map the synchronization sequence to a π / 2-BPSK symbol sequence based on a π / 2-BPSK modulation mapper; perform single-carrier modulation on the π / 2-BPSK symbol sequence using second modulation parameters to obtain a synchronization signal, where the second modulation parameters include at least one of the following: the bandwidth of the synchronization signal, or the second FDSS parameter.

[0146] In an alternative manner, when the modulation mode of the symbols carried by PBCH is π / 2-BPSK modulation, the bandwidth scaling degree of the synchronization signal is not less than that of the PBCH signal. The bandwidth scaling degree of the synchronization signal is related to the bandwidth of the synchronization signal and the number of symbols of the π / 2-BPSK symbol sequence mapped by the synchronization sequence. The bandwidth scaling degree of the PBCH signal is related to the bandwidth of the PBCH signal and the number of symbols carried by PBCH.

[0147] In an alternative manner, the modulation mode of the symbols carried by PBCH is π / 2-BPSK modulation, and the PBCH signal is obtained by single-carrier modulating PBCH with the first FDSS parameter; the synchronization signal is obtained by single-carrier modulating the synchronization sequence with the second FDSS parameter; the bandwidth scaling degree of the synchronization signal is equal to that of the PBCH signal, the first FDSS parameter is the same as the second FDSS parameter, the bandwidth scaling degree of the synchronization signal is related to the bandwidth of the synchronization signal and the number of symbols of the π / 2-BPSK symbol sequence mapped by the synchronization sequence, and the bandwidth scaling degree of the PBCH signal is related to the bandwidth of the PBCH signal and the number of symbols carried by PBCH.

[0148] In an alternative manner, the modulation mode of the symbols carried by PBCH includes one of the following: QPSK modulation, or OFFSET-QPSK modulation, or π / 2-BPSK modulation.

[0149] In an alternative manner, the synchronization signal is PSS, and / or, SSS.

[0150] In an alternative manner, the synchronization signal is PSS, the synchronization sequence is a first target synchronization sequence among a plurality of preset first synchronization sequences, and the number of the plurality of first synchronization sequences is related to the number of values of the physical layer cell identity 2; the first target synchronization sequence is used to indicate the physical layer cell identity 2.

[0151] In an alternative manner, the plurality of first synchronization sequences are obtained by performing different cyclic shift operations on a preset first basic synchronization sequence.

[0152] In an alternative manner, the shift amount of performing different cyclic shift operations on the preset first basic synchronization sequence is related to the length of the first target synchronization sequence and the number of values of the physical layer cell identity 2.

[0153] In an alternative manner, the synchronization signal is SSS, the synchronization sequence is a second target synchronization sequence among a plurality of preset second synchronization sequences, and the number of the plurality of second synchronization sequences is related to the number of values of the physical layer cell identity 1; the second target synchronization sequence is used to indicate the physical layer cell identity 1.

[0154] In an alternative manner, the multiple second synchronization sequences are obtained by performing different cyclic shift operations on a preset second base synchronization sequence, or the multiple second synchronization sequences are obtained by performing different cyclic shift operations on a preset third base synchronization sequence and performing different cyclic shift operations on a preset fourth base synchronization sequence.

[0155] In an alternative manner, the shift amounts of the different cyclic shift operations performed on the preset second base synchronization sequence, the preset third base synchronization sequence, and the preset fourth base synchronization sequence are all related to the length of the second target synchronization sequence and the number of values of the physical layer cell identifier 1.

[0156] In addition, as Figure 8 shown, it is a schematic structural diagram of a simplified terminal device provided by this application. For the convenience of understanding and illustration, Figure 8 in this case, the terminal takes a mobile phone as an example. As Figure 8 shown, the terminal includes a processor, a memory, a radio frequency circuit, an antenna, and an input / output device.

[0157] The processor is mainly used to process communication protocols and communication data, control the terminal device, execute software programs, process data of software programs, etc.

[0158] The memory is mainly used to store software programs and data.

[0159] The radio frequency circuit is mainly used for the conversion between baseband signals and radio frequency signals and the processing of radio frequency signals.

[0160] The antenna is mainly used to transmit and receive radio frequency signals in the form of electromagnetic waves.

[0161] The input / output device, such as a touch screen, a display screen, a keyboard, etc., is mainly used to receive data input by the user and output data to the user.

[0162] It should be noted that some types of terminal devices may not have an input / output device.

[0163] When data needs to be sent, after the processor performs baseband processing on the data to be sent, it outputs a baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal out in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data.

[0164] For the convenience of description, Figure 8Only one memory and one processor are shown. In an actual terminal device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor or integrated with the processor. The embodiments of the present application do not limit this.

[0165] In the embodiments of the present application, an antenna and a radio frequency circuit with transceiver functions may be regarded as a transceiver unit of the terminal device, and a processor with processing functions may be regarded as a processing unit of the terminal device.

[0166] As Figure 8 shown, the terminal 800 includes a transceiver unit 810 and a processing unit 820. The transceiver unit 810 may also be referred to as a transceiver, a transceiver machine, a transceiver device, etc. The processing unit 820 may also be referred to as a processor, a processing single board, a processing module, a processing device, etc.

[0167] Optionally, devices in the transceiver unit 810 for implementing the receiving function may be regarded as a receiving unit, and devices in the transceiver unit 810 for implementing the sending function may be regarded as a sending unit, that is, the transceiver unit 810 includes a receiving unit and a sending unit. The transceiver unit may sometimes also be referred to as a transceiver machine, a transceiver, or a transceiver circuit, etc. The receiving unit may sometimes also be referred to as a receiver, a receiver machine, or a receiving circuit, etc. The sending unit may sometimes also be referred to as a transmitter, a transmitter machine, or a transmitting circuit, etc.

[0168] It should be understood that the transceiver unit 810 is used to perform the sending operation and the receiving operation of the terminal device in the above method embodiments, and the processing unit 820 is used to perform other operations of the terminal device except the transceiver operation in the above method embodiments.

[0169] When the terminal device is a chip, the chip includes a transceiver unit 810 and a processing unit 820. Among them, the transceiver unit 810 may be an input / output circuit or a communication interface; the processing unit 820 is a processor, a microprocessor, an integrated circuit, or a logic circuit integrated on the chip.

[0170] The present application also provides a network device. As Figure 9 shown, it is a schematic structural diagram of a network device 900 provided by an embodiment of the present application. The network device 900 can be applied to a system as Figure 1 shown. For example, the network device 900 may be a network device in the Figure 1 system, and is used to perform the functions of the network device in the above method embodiments. It should be understood that the following is only an example. In future communication systems, the network device may have other forms and compositions.

[0171] For example, in a 5G communication system, the network device 900 may include a CU, a DU, and an AAU. Compared with the network device in an LTE communication system, which consists of one or more radio frequency units, such as a remote radio unit (RRU) and one or more building base band units (BBUs):

[0172] The non-real-time part of the original BBU will be split out and redefined as the CU, which is responsible for processing non-real-time protocols and services. The partial physical layer processing function of the BBU, combined with the original RRU and passive antenna, is redefined as the AAU. The remaining functions of the BBU are redefined as the DU, which is responsible for processing physical layer protocols and real-time services. In short, the CU and DU are distinguished by the real-time nature of the processed content, and the AAU is a combination of the RRU and the antenna.

[0173] The CU, DU, and AAU can be deployed separately or integrated. Therefore, there will be various network deployment forms. One possible deployment form is as follows Figure 9 shown, which is consistent with the traditional 4G network device, and the CU and DU are deployed on the same hardware. It should be understood that Figure 9 this is just an example and does not limit the protection scope of this application. For example, the deployment form can also be that the DU is deployed in the BBU computer room, the CU is centrally deployed or the DU is centrally deployed, and the CU is more highly centralized, etc.

[0174] The AAU 1000 can implement the transceiver function corresponding to the transceiver unit 702 in Figure 7 . Optionally, the AAU 1800 can also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc. It may include at least one antenna 1001 and a radio frequency unit 1002. Optionally, the AAU 1000 can include a receiving unit and a transmitting unit. The receiving unit can correspond to a receiver (or a receiver circuit), and the transmitting unit can correspond to a transmitter (or a transmitter circuit). The CU and DU 1100 can implement the internal processing function corresponding to the processing unit 701 in Figure 7 . Optionally, the CU and DU 1100 can control the network device, etc., and can be referred to as a controller. The AAU, CU, and DU can be physically set together or physically separated.

[0175] In addition, the network device is not limited to Figure 9 the form shown. It can also be other forms: for example, including a BBU and an adaptive radio unit (ARU), or including a BBU and an AAU; it can also be a customer premises equipment (CPE), or other forms, which are not limited in this application.

[0176] In one example, the CU and DU 1100 may be composed of one or more single boards. The multiple single boards may jointly support a radio access network of a single access mode (such as an LTE network), or may separately support radio access networks of different access modes (such as an LTE network, a 5G network, a future network, or other networks). The CU and DU 1100 further include a memory 1101 and a processor 1102. The memory 1101 is used to store necessary instructions and data. The processor 1102 is used to control the network device to perform necessary actions, for example, to control the network device to execute the operation processes of the network device in the above method embodiments. The memory 1101 and the processor 1102 may serve one or more single boards. That is to say, a memory and a processor may be separately provided on each single board. It is also possible that multiple single boards share the same memory and processor. In addition, necessary circuits may be provided on each single board.

[0177] It should be understood that Figure 9 the network device 900 shown is capable of implementing Figure 5 the functions of the network device involved in the method embodiments. The operations and / or functions of each unit in the network device 1700 are respectively for implementing the corresponding processes executed by the network device in the method embodiments of the present application. To avoid repetition, the detailed description is appropriately omitted here. Figure 9 The structure of the exemplary network device is only one possible form and should not constitute any limitation to the embodiments of the present application. The present application does not exclude the possibility of other forms of network device structures that may appear in the future.

[0178] The above CU and DU 1100 may be used to execute the actions implemented inside the network device described in the previous method embodiments, while the AAU 1000 may be used to execute the actions of the network device sending to or receiving from the terminal device described in the previous method embodiments. For specific details, please refer to the description in the previous method embodiments and will not be elaborated here.

[0179] The embodiments of the present application further provide a communication system, which includes a terminal device and a network device. The terminal device is used to execute all or part of the steps executed by the terminal device in the above Figure 5 shown embodiments. The network device is used to execute all or part of the steps executed by the network device in the Figure 5 shown embodiments.

[0180] Based on the above embodiments, the embodiments of the present application further provide a readable storage medium, which stores instructions that, when executed, implement the methods in any of the above embodiments. The readable storage medium may include various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disc.

[0181] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, compact disc read-only memory (CD-ROM), optical memory, etc.) that contain computer-usable program code.

[0182] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0183] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device that realizes the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0184] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for realizing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

Claims

1. A communication method, characterized in that, applied to a network device, comprising: obtaining a Synchronization Signal Block (SSB), where the SSB includes: a Physical Broadcast Channel (PBCH) signal and a synchronization signal, the PBCH signal is obtained by performing single-carrier modulation on the PBCH, and the synchronization signal is obtained by performing single-carrier modulation on a synchronization sequence; transmitting the SSB.

2. A communication method, characterized in that, applied to a terminal, comprising: receiving a Synchronization Signal Block (SSB), where the SSB includes: a Physical Broadcast Channel (PBCH) signal and a synchronization signal, the PBCH signal is obtained by performing single-carrier modulation on the PBCH, and the synchronization signal is obtained by performing single-carrier modulation on a synchronization sequence; demodulating the synchronization signal and the PBCH signal.

3. The method according to claim 1 or 2, characterized in that, the PBCH signal is obtained by performing single-carrier modulation on the PBCH using first modulation parameters, and the first modulation parameters include at least one of the following: the modulation method of the symbol carried by the PBCH, the bandwidth of the PBCH signal, the number of symbols carried by the PBCH, or the first Frequency Domain Spectrum Shaping (FDSS) parameter.

4. The method according to claim 1, characterized in that, the synchronization signal is obtained in the following manner: based on a π / 2-BPSK modulation mapper, mapping the synchronization sequence to a π / 2-BPSK symbol sequence; performing single-carrier modulation on the π / 2-BPSK symbol sequence using second modulation parameters to obtain the synchronization signal, and the second modulation parameters include at least one of the following: the bandwidth of the synchronization signal, or the second FDSS parameter.

5. The method according to any one of claims 1-4, characterized in that, when the modulation method of the symbol carried by the PBCH is π / 2-BPSK modulation, the bandwidth scaling degree of the synchronization signal is not less than the bandwidth scaling degree of the PBCH signal, the bandwidth scaling degree of the synchronization signal is related to the bandwidth of the synchronization signal and the number of symbols of the π / 2-BPSK symbol sequence mapped by the synchronization sequence, and the bandwidth scaling degree of the PBCH signal is related to the bandwidth of the PBCH signal and the number of symbols carried by the PBCH.

6. The method according to claim 1 or 2, characterized in that, the modulation method of the symbol carried by the PBCH is π / 2-BPSK modulation, the PBCH signal is obtained by performing single-carrier modulation on the PBCH using the first FDSS parameter; the synchronization signal is obtained by performing single-carrier modulation on the synchronization sequence using the second FDSS parameter; the bandwidth scaling degree of the synchronization signal is equal to the bandwidth scaling degree of the PBCH signal, the first FDSS parameter is the same as the second FDSS parameter, the bandwidth scaling degree of the synchronization signal is related to the bandwidth of the synchronization signal and the number of symbols of the π / 2-BPSK symbol sequence mapped by the synchronization sequence, and the bandwidth scaling degree of the PBCH signal is related to the bandwidth of the PBCH signal and the number of symbols carried by the PBCH.

7. The method according to any one of claims 1-6, It is characterized in that the modulation method of the symbol carried by the PBCH includes one of the following: Quadrature Phase Shift Keying (QPSK) modulation, or Offset Quadrature Phase Shift Keying (OFFSET-QPSK) modulation, or π / 2-BPSK modulation.

8. The method according to any one of claims 1-7, It is characterized in that the synchronization signal is the Primary Synchronization Signal (PSS), and / or, the Secondary Synchronization Signal (SSS).

9. The method according to any one of claims 1-8, It is characterized in that the synchronization signal is PSS, the synchronization sequence is a first target synchronization sequence among a plurality of preset first synchronization sequences, and the number of the plurality of first synchronization sequences is related to the number of values of the physical layer cell identifier 2; the first target synchronization sequence is used to indicate the physical layer cell identifier 2.

10. The method according to claim 9, It is characterized in that the plurality of first synchronization sequences are obtained by performing different cyclic shift processes on a preset first basic synchronization sequence.

11. The method according to claim 10, It is characterized in that the shift amount of the different cyclic shift processes performed on the preset first basic synchronization sequence is related to the length of the first target synchronization sequence and the number of values of the physical layer cell identifier 2.

12. The method according to any one of claims 1-8, It is characterized in that the synchronization signal is SSS, the synchronization sequence is a second target synchronization sequence among a plurality of preset second synchronization sequences, and the number of the plurality of second synchronization sequences is related to the number of values of the physical layer cell identifier 1; the second target synchronization sequence is used to indicate the physical layer cell identifier 1.

13. The method according to claim 12, It is characterized in that the plurality of second synchronization sequences are obtained by performing different cyclic shift processes on a preset second basic synchronization sequence, or, the plurality of second synchronization sequences are obtained by performing different cyclic shift processes on a preset third basic synchronization sequence and performing different cyclic shift processes on a preset fourth basic synchronization sequence.

14. The method according to claim 13, It is characterized in that the shift amounts of the different cyclic shift processes performed on the preset second basic synchronization sequence, the preset third basic synchronization sequence, and the preset fourth basic synchronization sequence are all related to the length of the second target synchronization sequence and the number of values of the physical layer cell identifier 1.

15. A communication device, It is characterized in that comprises: a functional module for implementing the method according to any one of claims 1-14.

16. A communication device, It is characterized in that comprises: at least one processor and a memory; the memory is used for storing computer programs or instructions; the at least one processor is used for executing the computer programs or instructions so that the method according to any one of claims 1-14 is executed.

17. A chip system, It is characterized in that the chip system comprises: a processing circuit; the processing circuit is coupled to a storage medium; The processing circuit is configured to execute some or all of the computer programs or instructions in the storage medium, and when the some or all of the computer programs or instructions are executed, to implement the method according to any one of claims 1-14.

18. A computer-readable storage medium, characterized in that, the computer-readable storage medium stores instructions, and when the instructions are executed by a computer, the method according to any one of claims 1-14 is executed.

19. A computer program product comprising computer programs or instructions, characterized in that, when the computer programs or instructions are run on a computer, the method according to any one of claims 1-14 is executed.

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