Communication method, and apparatus

Abstract

The present application relates to the technical field of communications, and provides a communication method and an apparatus. A network device obtains a synchronization signal block (SSB), the SSB comprising a 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; the network device sends the SSB; and a terminal receives the SSB, and the terminal demodulates the synchronization signal and the PBCH signal. Since single-carrier modulation can ensure that signals have lower peak-to-average power ratio (PAPR), both the PBCH signal and the synchronization signal in the SSB in the present application use single-carrier modulation, thereby ensuring lower PAPR for the SSB.

Description

Communication method and device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on December 1, 2023, with application number 202311648335.X and application name "A Communication Method and Device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The embodiments of the present application relate to the field of communication technology, and in particular to a communication method and apparatus. Background Art

[0004] User equipment (UE) can communicate with network equipment only after accessing a cell. To access a cell, the UE needs to perform a cell search (which includes signal synchronization processing, etc.) to demodulate downlink signals and transmit uplink signals with precise timing.

[0005] Signal synchronization uses two specially designed synchronization signals: the primary synchronization signal (PSS) and the secondary synchronization signal (SSS). Network equipment broadcasts these synchronization signals in each cell. If the UE detects these two synchronization signals, the network equipment and the UE are synchronized in time and frequency. In addition, during the initial synchronization process, in addition to detecting the synchronization signals, the UE also decodes the physical broadcast channel (PBCH) to obtain key system parameters to better communicate with the network equipment.

[0006] The existing synchronization signal block (SSB) uses orthogonal frequency division multiplexing (OFDM) modulation and has a high peak to average power ratio (PAPR). In order to ensure the coverage requirements of the communication system, how to ensure that the SSB has a low PAPR, the relevant technology has not proposed a solution.

[0007] Summary of the Invention

[0008] The present application provides a communication method and apparatus to ensure that SSB has low PAPR.

[0009] In the first aspect, the present application provides a communication method that can be executed through the interaction between a terminal and a network device, wherein the terminal can be understood as the terminal itself, and can also be understood as a chip set inside the terminal, which is not specifically limited 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, and can also be understood as a chip set inside the network device. The network device can be a base station, a satellite, an access point, etc., which is not specifically limited here; the method can be applied to 5G communication systems or communication systems above 5G, and can also be applied to non-terrestrial communication systems, which is not specifically limited here. In actual application, it is performed as follows:

[0010] The network device obtains the SSB, which includes: the PBCH signal and the synchronization signal. The PBCH signal is obtained by single-carrier modulation of the PBCH, and the synchronization signal is obtained by single-carrier modulation of 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.

[0011] Since a single-carrier modulated signal can have a lower PAPR than a multi-carrier modulated signal represented by OFDM modulation, in this application, the PBCH signal and the synchronization signal in the SSB are both modulated using a single carrier to generate an SSB with a low PAPR.

[0012] In an optional manner, the PBCH signal is obtained by single-carrier modulation of the PBCH using a first modulation parameter, and the first modulation parameter includes at least one of the following: a modulation method of symbols carried by the PBCH, a bandwidth of the PBCH signal, a number of symbols carried by the PBCH, or a first frequency domain spectrum shaping (FDSS) parameter.

[0013] In an optional manner, the synchronization signal is obtained by:

[0014] The network device maps the synchronization sequence into a π / 2-BPSK symbol sequence based on a π / 2-BPSK modulation mapper; single-carrier modulates 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 a second FDSS parameter.

[0015] Because the phase difference between adjacent symbols in a π / 2-BPSK symbol sequence is limited to 90 degrees, using a π / 2-BPSK symbol sequence for single-carrier modulation results in a lower PAPR than using other input symbol sequences (such as quadrature phase shift keying (QPSK)). Therefore, synchronization signals using π / 2-BPSK single-carrier modulation have a low PAPR.

[0016] In an optional 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 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.

[0017] This approach can ensure that the PAPR of the modulated synchronization signal is no higher than the PAPR of the PBCH signal, thereby improving communication coverage and ensuring communication quality.

[0018] In an optional 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 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.

[0019] In this method, the same FDSS parameters are used to modulate the PBCH signal and the synchronization signal. Then, the synchronization signal can be used as the demodulation reference signal (DMRS) of the PBCH. There is no need to send a dedicated PBCH DMRS, which can reduce overhead or allow the PBCH to indicate more information.

[0020] In an optional 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.

[0021] In an optional manner, the synchronization signal is PSS and / or SSS.

[0022] In an optional 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 equal to the physical layer cell identifier 2 (denoted as ) is related to the number of values; the first target synchronization sequence is used to indicate In this way, the terminal can obtain the

[0023] In an optional manner, the multiple first synchronization sequences are obtained by performing different cyclic shift processes on a preset first base synchronization sequence.

[0024] The present application can obtain multiple first synchronization sequences by cyclic shift processing of the first base synchronization sequence, so as to indicate the first synchronization sequence by multiple different first synchronization sequences. and other information.

[0025] In an optional manner, the shift amount of the different cyclic shift processing performed on the preset first base synchronization sequence is different from the length of the first target synchronization sequence, The number of values ​​of .

[0026] In an optional 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 the same as the physical layer cell identifier 1 (denoted as ) is related to the number of values; the second target synchronization sequence is used to indicate

[0027] In this way, the terminal can obtain

[0028] In an optional manner, the multiple second synchronization sequences are obtained by performing different cyclic shift processing on the preset second base synchronization sequence, or the multiple second synchronization sequences are obtained by performing different cyclic shift processing on the preset third base synchronization sequence and performing different cyclic shift processing on the preset fourth base synchronization sequence.

[0029] The present application can obtain more second synchronization sequences by cyclic shifting the second base synchronization sequence, or obtain more second synchronization sequences by performing different cyclic shifting on the third base synchronization sequence and the fourth base synchronization sequence, so as to indicate the second synchronization sequence by multiple different second synchronization sequences. and other information.

[0030] In an optional manner, the shift amounts of the different cyclic shift processing performed on the preset second base synchronization sequence, the preset third base synchronization sequence, and the preset fourth base synchronization sequence are all the same as the length of the second target synchronization sequence, The number of values ​​of .

[0031] In a second aspect, an embodiment of the present application provides 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 has the function of implementing the above-mentioned first aspect. For example, the communication device includes a module or unit or means corresponding to executing the steps involved in the above-mentioned first aspect. The function or unit or means may be implemented by software or by hardware, or the corresponding software implementation may be executed by hardware.

[0032] In one possible design, the communication device includes a processing unit and a transceiver unit, wherein the transceiver unit can be used to send and receive signals to achieve communication between the communication device and other devices, for example, the transceiver unit is used to receive a first message; the processing unit can be used to perform some internal operations of the communication device. The transceiver unit can be called an input / output unit, a communication unit, etc., and the transceiver unit can be a transceiver; the processing unit can be a processor. When the communication device is a module (such as a chip) in a communication device, the transceiver unit can be an input / output interface, an input / output circuit, or an input / output pin, etc., and can also be called an interface, a communication interface, or an interface circuit, etc.; the processing unit can be a processor, a processing circuit, or a logic circuit, etc.

[0033] In another possible design, the communication device includes a processor and may also include a transceiver, the transceiver being used to transmit and receive signals, and the processor executing program instructions to perform the method in any possible design or implementation of the first aspect above. The communication device may also include one or more memories, the memories being used to couple with the processor, and the memories being used to store the necessary computer programs or instructions for implementing the functions involved in the first aspect above. The processor may execute the computer programs or instructions stored in the memories, and when the computer programs or instructions are executed, the communication device implements the method in any possible design or implementation of the first aspect above.

[0034] In another possible design, the communication device includes a processor, which can be coupled to a memory. The memory can store the necessary computer programs or instructions for implementing the functions of the first aspect. The processor can execute the computer programs or instructions stored in the memory. When the computer programs or instructions are executed, the communication device implements the method of any possible design or implementation of the first aspect.

[0035] In another possible design, the communication device includes a processor and an interface circuit, wherein the processor is used to communicate with other devices through the interface circuit and execute the method in any possible design or implementation of the first aspect above.

[0036] It can be understood that in the second aspect above, the processor can be implemented by hardware or by 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, which is implemented by reading the software code stored in the memory. In addition, the above processors can be one or more, and the memories can be one or more. The memory can be integrated with the processor, or the memory and the processor can be set separately. In the specific implementation process, the memory can be integrated with the processor on the same chip, or can be set on different chips respectively. The embodiment of the present application does not limit the type of memory and the setting method of the memory and the processor.

[0037] In a third aspect, an embodiment of the present application provides a communication system, which includes the terminal and network equipment according to the first aspect.

[0038] In a fourth aspect, the present application provides a chip system, which includes a processor and may also include a memory, for implementing the method described in the first aspect. The chip system may be composed of a chip or may include a chip and other discrete devices.

[0039] 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 are executed on a computer, the computer executes the method in the first aspect.

[0040] In a sixth aspect, the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the methods of each embodiment of the first aspect described above.

[0041] For the technical effects that can be achieved in the above-mentioned second to sixth aspects, please refer to the description of the technical effects that can be achieved by the corresponding possible design schemes in the above-mentioned first aspect, and this application will not repeat them here. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG1 shows a schematic diagram of a communication system provided by an embodiment of the present application;

[0043] FIG2 is a schematic diagram showing a frequency response corresponding to different roll-offs;

[0044] FIG3 shows a schematic diagram of bandwidth extension;

[0045] FIG4 shows a schematic structural diagram of SSB;

[0046] FIG5 is a schematic diagram showing a flow chart of a communication method provided in an embodiment of the present application;

[0047] FIG6 shows a schematic diagram of a bandwidth scaling degree provided by a real-time example of the present application;

[0048] FIG7 shows a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0049] FIG8 shows a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0050] FIG9 shows a schematic structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of this application clearer, the present application will be further described in detail below with reference to the accompanying drawings. The specific operating methods in the method embodiments can also be applied to the device embodiments or system embodiments. In the description of this application, unless otherwise specified, "multiple" means two or more. Therefore, the implementation of the device and method can refer to each other, and the repeated parts will not be repeated.

[0052] The technical solutions provided in the embodiments of the present application can be applied to 5G systems, or to future communication systems or other similar communication systems. In addition, the technical solutions provided in the embodiments of the present application can be applied to cellular links, public land mobile networks (PLMN), machine to machine (M2M) networks, Internet of Things (IoT) networks or other networks. It can also be applied to links between devices, such as device to device (D2D) links. D2D links can also be called sidelinks, where sidelinks can also be called side links or side links, etc. In the embodiments of the present application, the above terms all refer to links established between devices of the same type, and their meanings are the same. The so-called devices of the same type can be links between terminal devices, links between base stations, links between relay nodes, etc., and the embodiments of the present application do not limit this. For links between terminal devices, there are D2D links defined in Release (Rel) 12 / 13 of the Third Generation Partnership Project (3GPP), as well as V2X links defined for vehicle-to-vehicle, vehicle-to-mobile phone, or vehicle-to-any-entity (V2X) for the Internet of Vehicles (IoV), including Rel-14 / 15. Also included are V2X links based on the New Radio (NR) system defined in Rel-18 and later.

[0053] Reference is made to Figure 1, which 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 network device 111, network device 112, and network device 113 shown in Figure 1. The wireless communication system may also include at least one terminal device, such as terminal device 121, terminal device 122, terminal device 123, terminal device 124, terminal device 125, terminal device 126, and terminal device 127 shown in Figure 1. Network devices and terminal devices can communicate with each other, such as in multi-site transmission as shown in Figure 1, where network device 112 can communicate with terminal devices 121, 122, and 123; or in enhanced mobile broadband (eMBB) transmission as shown in Figure 1, where network devices 112 and 113 can communicate with terminal device 124. Network devices can also communicate with each other, such as in backhaul as shown in Figure 1, where network device 111 can communicate with network devices 112 and 113. Terminal devices may also communicate with each other, such as the D2D transmission shown in FIG. 1 , where, for example, terminal device 122 may communicate with terminal device 125 .

[0054] A terminal device may be a wireless terminal device capable of receiving network device scheduling and instruction information. A wireless terminal device may be a device that provides voice and / or data connectivity to a user, or a handheld device with wireless connection capabilities, or other processing devices connected to a wireless modem. A wireless terminal device may communicate with one or more core networks or the Internet via a radio access network (e.g., a radio access network, RAN). A wireless terminal device may be a mobile terminal device, such as a mobile phone (also known as a "cellular" phone, mobile phone), a computer, and a data card. For example, a mobile device may be portable, pocket-sized, handheld, built-in, or in-vehicle, and may exchange voice and / or data with a radio access network. Examples include personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, PDAs, tablet computers, and computers with wireless transceiver capabilities. A wireless terminal device may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station (MS), a remote station, an access point (AP), a remote terminal, an access terminal, a user terminal, a user agent, a subscriber station (SS), a customer premises equipment (CPE), a terminal, a user equipment (UE), a mobile terminal (MT), etc. A wireless terminal device may also be a wearable device and a next-generation communication system, for example, a terminal device in a 5G network or a terminal device in a future evolved public land mobile network (PLMN) network, a terminal device in an NR communication system, etc.

[0055] A network device is an entity on the network side used to transmit or receive signals, such as a Transmitter Relay (TRP) or a gNB. A network device can be used to communicate with mobile devices. A network device can be an access point (AP) in a wireless local area network (WLAN), a base transceiver station (BTS) in a global system for mobile communication (GSM) or code division multiple access (CDMA), a base station (NodeB) in wideband code division multiple access (WCDMA), an evolutionary Node B (eNB or eNodeB) in long-term evolution (LTE), a relay station or access point, or a network device in an in-vehicle device, wearable device, future 5G network, or future evolved PLMN, or a gNodeB / gNB in ​​a NR system. 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 gNB functions, while the DU implements some gNB functions. For example, the CU is responsible for processing non-real-time protocols and services, such as radio resource control (RRC), service data adaptation protocol (SDAP), and packet data convergence protocol (PDCP). The DU is responsible for processing physical layer protocols and real-time services, such as radio link control (RLC), medium access control (MAC), and physical (PHY) layer functions. The AAU implements some physical layer processing functions, RF processing, and active antenna-related functions. Because RRC layer information ultimately becomes PHY layer information, or is converted from PHY layer information, in this architecture, higher-layer signaling, such as RRC layer signaling, can also be considered to be sent by the DU, or by both the DU and the AAU. It is understood that a network device can be a device that includes one or more of a CU node, a DU node, or an AAU node.In addition, the CU can be divided into a network device in the access network (radio access network, RAN), or the CU can be divided into a network device in the core network (core network, CN), which is not limited in this application. In addition, in an embodiment of the present application, the network device provides services for a cell, and the terminal device communicates with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell can be a cell corresponding to the network device (for example, a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. The small cell here can include: a metro cell, a micro cell, a pico cell, a femto cell, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services. In addition, in other possible cases, the network device may be other devices that provide wireless communication functions for terminal devices. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device. For the convenience of description, in the embodiments of the present application, the device that provides wireless communication functions for terminal devices is referred to as a network device.

[0056] In order to better illustrate the solution of this application, the following technical terms involved in this application are explained:

[0057] 1)π / 2-BPSK modulation

[0058] NR protocol 38.211 Section 5.1.1 defines π / 2-BPSK modulation as shown in the following formula 1:

[0059] Where b(i) represents the i-th bit, and d(i) represents the modulation symbol, i.e., the i-th symbol in the π / 2-BPSK symbol sequence, and j 2 = 1. Next, we analyze the frequency domain signal corresponding to the π / 2-BPSK symbol sequence. Assuming the π / 2-BPSK symbol sequence {d(i)} contains N symbols, performing an N-point discrete Fourier transform (DFT) on {d(i)} yields the corresponding frequency domain signal, denoted as y(k), where k = 0, 1, …, N-1.

[0060] Where y(k) has the following properties, see Formula 2:

[0061] The superscript * indicates the complex conjugation operation. Therefore, y(k), k=0,1,…,N-1 has Redundant signals. Remove these redundant signals and use the remaining The signal combined with the above relationship can still recover y(k), k=0,1,…,N-1.

[0062] If we perform phase rotation on {d(i)} as shown in formula 3 before doing DFT, we get

[0063] Then Doing N-point DFT can get the frequency domain signal k=0,1,…,N-1.

[0064] It has the following properties, see formula 4:

[0065] therefore, k=0,1,…,N-1 has Redundant signals. Remove these redundant signals and use the remaining The signal can still be recovered by combining the above relationship k=0,1,…,N-1.

[0066] 2) Using bandwidth scaling and FDSS to reduce single-carrier signal PAPR

[0067] Before introducing the specific technology, let's first introduce the concepts of roll-off and spectrum extension factor. Roll-off is the steepness of the frequency response function with frequency. Figure 2 shows the frequency response under different roll-offs (β = 0, 0.25, 0.5, 1). As can be seen, the frequency response with a rectangular shape is the steepest. In practice, filters with rectangular window frequency responses are difficult to implement. Using roll-off can reduce the difficulty of filter implementation, but it increases the bandwidth. The roll-off factor is defined as the following formula 5:

[0068] The no-roll-off bandwidth corresponds to the bandwidth when β = 0. As shown in Figure 2, when β = 1, the bandwidth doubles. When β = 0.5, the bandwidth increases by 50%.

[0069] In addition, regarding spectrum / bandwidth extension, there is also a spectrum / bandwidth extension factor defined as the following formula 6:

[0070] For example, if β=1, the spectrum / bandwidth expansion factor is 0.5; if β=0.5, the spectrum / bandwidth expansion factor is 1 / 3.

[0071] 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 use roll-off (or spectrum / bandwidth expansion) and FDSS to achieve PAPR reduction. Figure 3 is a schematic diagram of DFT-s-OFDM modulation with bandwidth expansion and FDSS processing provided by an embodiment of the present application. In which, the symbol sequence is processed by DFT to obtain a frequency domain signal S k , as the input of the bandwidth expansion module. Figure 3 also shows a bandwidth expansion implementation method: S k The tail portion of the signal is copied to S k In front of S k The header signal is copied to S k The signal output by the bandwidth extension module is used as the input of the FDSS module. The output of the FDSS module is equal to the input multiplied by the FDSS coefficient, and then the subcarrier mapping, inverse discrete Fourier transform (IDFT) and cyclic prefix (CP) processing operations are performed. For example, after bandwidth expansion, the signal Its i-th value is FDSS output signal The i-th value is and The relationship between them complies with the following formula 7:

[0072] Where c[i] is the i-th FDSS coefficient.

[0073] 3)SSB

[0074] In 5G mobile communication systems, synchronization signals are sent together with PBCH signals to form an SS / PBCH block, referred to as an SSB. The SSB described below in the embodiments of this application may also refer to an SS / PBCH block. The synchronization signal block (SS) includes the PSS and SSS.

[0075] As shown in Figure 4, in the time domain, one SSB occupies four orthogonal frequency division multiplexing (OFDM) symbols, symbols 0 to 3. In the frequency domain, one SSB occupies 20 resource blocks (RBs) (one RB contains 12 subcarriers), or 240 subcarriers, numbered 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 SSS, subcarriers are reserved on either side of the PSS and SSS as guard subcarriers. For example, the blank areas on either side of the SSS in Figure 4 are guard subcarriers. Guard subcarriers are not used to carry signals. The PBCH occupies all subcarriers in symbols 1 and 3, as well as a portion of the remaining subcarriers in symbol 2, excluding those occupied by the SSS (i.e., the remaining subcarriers excluding the guard subcarriers).

[0076] PSS can be used to indicate the physical layer cell identity 2 (denoted as ), SSS can be used to indicate the physical layer cell identity 1 (denoted as ), and Together, they determine multiple physical cell identities (PCIs) in the 5G communication system. Once a terminal successfully searches for the PSS and SSS, it knows the physical cell identity of the 5G carrier and is able to parse the system information contained in the SSB.

[0077] The existing SSB is modulated using OFDM and has a high PAPR. In order to ensure the coverage requirements of the communication system, how to ensure that SSB has a low PAPR, the relevant technology has not proposed a solution. Based on this, the present application provides a communication method to ensure that SSB has a low PAPR. Referring to Figure 5, it can be executed through the interaction between the terminal and the network device, wherein the terminal can be understood as the terminal itself, and can also be understood as a chip set inside the terminal, which is not specifically limited 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, and can also be understood as 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 5G communication systems or communication systems above 5G, and can also be applied to non-terrestrial communication systems, which are not specifically limited here by this application. In actual application, it is executed as follows:

[0078] In step 501, the network device obtains an SSB, which includes a PBCH signal and a synchronization signal. The PBCH signal is obtained by applying single-carrier modulation to the PBCH, and the synchronization signal is obtained by applying single-carrier modulation to the synchronization sequence.

[0079] Referring to FIG. 4 above, it can be seen that the SSB includes a PBCH signal and a synchronization signal (PSS and SSS). In the present application, the network device can obtain the PBCH signal by applying single-carrier modulation to the PBCH, and can also reuse the PBCH signal modulated by other network devices. For example, base station 1 and base station 2 are co-deployed, and base station 1 has generated a 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 operation of base station 2 and improve data processing efficiency. In the present application, the network device can obtain the synchronization signal by applying single-carrier modulation to the synchronization sequence (the synchronization sequence is constructed by one of the following: m sequence, gold sequence, or Golay sequence, and which sequence is constructed is not specifically limited here), and can also reuse the synchronization signal modulated by other network devices. It can be understood by referring to the description of the PBCH signal and will not be repeated here. The single-carrier modulation technology, for example, DFT-s-OFDM modulation, time-domain linear convolution single carrier (SC) modulation, SC-FDE (single carrier-frequency domain equalization), etc., is not specifically limited here.

[0080] In practical applications, the above 1) and 2) can be combined to further process the PBCH and synchronization sequence (different synchronization sequences can be used for different synchronization signals) during single-carrier modulation to reduce the PAPR of the PBCH and synchronization signals. Next, single-carrier modulation is explained in conjunction with 1) and 2).

[0081] Specifically, the PBCH signal is obtained by single-carrier modulation of the PBCH using a first modulation parameter, where the first modulation parameter includes at least one of the following: a modulation mode of symbols carried by the PBCH, a bandwidth of the PBCH signal, a number of symbols carried by the PBCH, or a first FDSS parameter. The modulation mode of the symbols carried by the PBCH includes one of the following: QPSK modulation, OFFSET-QPSK modulation, or π / 2-BPSK modulation.

[0082] In one optional embodiment, the network device maps a synchronization sequence into a π / 2-BPSK symbol sequence based on a π / 2-BPSK modulation mapper; and single-carrier modulates the π / 2-BPSK symbol sequence using a second modulation parameter to obtain a synchronization signal. The second modulation parameter includes at least one of the following: a synchronization signal bandwidth or a second FDSS parameter. Because 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 input for single-carrier modulation results in a lower PAPR than a single-carrier signal using other input symbol sequences (such as a QPSK symbol sequence). Therefore, the synchronization signal using the π / 2-BPSK single-carrier modulation has a low PAPR.

[0083] Furthermore, in practical applications, the synchronization signal has a lower PAPR than the PBCH signal, which helps improve the coverage of the communication system. Specifically, when the modulation scheme of the symbols carried by the PBCH is QPSK modulation or OFFSET-QPSK modulation, and the synchronization sequence is modulated using π / 2-BPSK, the PAPR of the synchronization signal can be guaranteed to be no higher than the PAPR of the PBCH signal. When the modulation scheme of the symbols carried by the PBCH is π / 2-BPSK modulation, the bandwidth expansion of the synchronization signal is no less than (greater than or equal to) the bandwidth expansion of the PBCH signal, or the bandwidth compression of the synchronization signal is no greater than (less than or equal to) the bandwidth compression of the PBCH signal, thereby ensuring that the PAPR of the modulated synchronization signal is no higher than the PAPR of the PBCH signal. Compression needs to be considered because the frequency domain signal corresponding to the π / 2-BPSK symbol sequence has redundancy. Removing this redundancy can still restore the complete frequency domain signal, thereby improving spectral efficiency without loss of transmission performance. The process of removing this redundancy can be understood as bandwidth compression. For example, as shown in FIG6(a), the initial bandwidth of the synchronization signal is W1. After bandwidth expansion processing, the bandwidth is expanded to 1.5W1. Therefore, 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. After bandwidth expansion processing, the bandwidth is expanded to 4 / 3W2. Therefore, the bandwidth expansion degree of the PBCH signal is 33.3% (4 / 3-1=1 / 3). Therefore, the bandwidth expansion degree of the synchronization signal is greater than the bandwidth expansion degree of the PBCH signal. As shown in FIG6(b), the initial bandwidth of the synchronization signal is W1. After bandwidth compression processing, the bandwidth is compressed to 2 / 3W1. Therefore, 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. Therefore, the bandwidth compression degree of the PBCH signal is 50% (1-0.5=0.5). Therefore, the bandwidth compression degree of the synchronization signal is less than the bandwidth compression degree of the PBCH signal.

[0084] As mentioned above, the degree of bandwidth scaling (expansion or compression) 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 (that is, the degree of bandwidth scaling of the synchronization signal can be determined with reference to the bandwidth of the synchronization signal and the number of symbols of 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 of the π / 2-BPSK symbol sequence, it can also be replaced by describing the length of the synchronization sequence. Therefore, the degree of bandwidth scaling of the synchronization signal is related to the bandwidth of the synchronization signal and the length of the synchronization sequence), and the degree of bandwidth scaling 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 degree of bandwidth scaling 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).

[0085] 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 the PSS, or the bandwidth scaling degree of the SSS, which is not specifically limited here), and the bandwidth scaling degree of the PBCH signal can be determined with reference to Formula 9:

[0086] Here, α1 indicates the degree of bandwidth scaling for the synchronization signal; ΔF1 indicates the number of subcarriers corresponding to the synchronization signal bandwidth; 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 that can be 1, -1, or other values. The value of γ1 can be flexibly adjusted in practical applications. For example, actual production applications tend to use the positive or negative value of α1 to determine bandwidth expansion and bandwidth compression. That is, an α1 greater than zero corresponds to bandwidth expansion, while an α1 less than zero corresponds to bandwidth compression. To meet this requirement, γ1 can be set to 1.

[0087] Here, α2 indicates the degree of bandwidth scaling for the PBCH signal; ΔF2 indicates the number of subcarriers corresponding to the PBCH bandwidth; and N2 indicates the number of symbols in the symbol sequence obtained after PBCH symbol modulation. For example, actual production applications tend to use the positive or negative value of α2 to determine bandwidth expansion and bandwidth compression. That is, α2 greater than zero corresponds to bandwidth expansion, while α2 less than zero corresponds to bandwidth compression. To meet this requirement, γ1 can be set to 1. In Formulas 8 and 9 above, the value of γ1 is the same.

[0088] Assuming that π / 2-BPSK modulation is used and γ1=1, combined with 1), it can be seen that if the π / 2-BPSK symbol sequence is subjected to a phase rotation as shown in Formula 3 before DFT, the minimum bandwidth compression can be -0.5.

[0089] In order to ensure that the PAPR of the synchronization signal is not higher than the PAPR of the PBCH signal, the bandwidth scaling degree of the synchronization signal is usually not less than the bandwidth scaling degree of the PBCH signal (equivalent to the above-mentioned bandwidth expansion degree of the synchronization signal being greater than or equal to the bandwidth expansion degree of the PBCH signal, and the above-mentioned bandwidth compression degree of the synchronization signal being less than or equal to the bandwidth compression degree of the PBCH signal).

[0090] Furthermore, when the PBCH symbols are modulated using π / 2-BPSK, the PBCH signal is single-carrier modulated using the first FDSS parameters; the synchronization signal is single-carrier modulated using the synchronization sequence using the second FDSS parameters. The bandwidth scaling of the synchronization signal is equal to that of the PBCH signal, and the first and second FDSS parameters are identical. In this scheme, the PBCH and synchronization signals are modulated using the same FDSS parameters. Therefore, the synchronization signal can be used as the DMRS for the PBCH, eliminating the need for a dedicated PBCH DMRS. This reduces overhead and allows the PBCH to indicate more information.

[0091] In step 502, the network device sends an SSB, and the terminal receives the SSB accordingly.

[0092] Step 503: The terminal demodulates the synchronization signal and the PBCH signal.

[0093] Specifically, after the terminal demodulates the synchronization signal and PBCH signal, it can better achieve signal synchronization between the terminal and network equipment. In addition, in actual applications, to improve cell coverage, π / 2-BPSK single-carrier modulation can also be used for reference signals such as CSI-RS, SRS, TRS, PRS, and RACH.

[0094] In this application, since a single-carrier modulated signal can have a lower PAPR than a multi-carrier modulated signal represented by OFDM modulation, in this application, the PBCH signal and synchronization signal in the SSB are both modulated by a single carrier to generate an SSB with a low PAPR.

[0095] Referring to the above 3), it can be seen that PSS can be used to indicate SSS can be used to indicate and Together, they determine multiple PCIs in the 5G communication system. Once a terminal successfully searches for the PSS and SSS, it knows the physical cell ID of the 5G carrier and is thus able to parse the system information contained in the SSB. The following describes how the synchronization sequence indicates the physical layer cell identity for different synchronization signals.

[0096] Case 1: The synchronization signal is PSS

[0097] 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 the same as The first target synchronization sequence is used to indicate

[0098] For example, The number of values ​​of is N1, so the number of first synchronization sequences is also N1. In practical applications, one synchronization sequence (that is, the first target synchronization sequence) among the N1 first synchronization sequences can be selected to obtain the PSS by single-carrier modulation. The above-mentioned multiple first synchronization sequences can also be obtained by performing different cyclic shift processing on the preset first base synchronization sequence, and the shift amount is different from Related. You can refer to the construction of PSS in the related art to understand. In the related art, the PSS signal is obtained by BPSK OFDM modulation of the synchronization sequence. The first base synchronization sequence is an m sequence with a length of 127, which generates three synchronization sequences through cyclic shift, and the corresponding cyclic shift amounts are 0, 43 and 86 respectively. Since in the related art, The cyclic shift amount can be understood as That is, PSS is realized by designing the cyclic shift amount. Related.

[0099] In this application, the shift amount of the preset first base synchronization sequence subjected to different cyclic shift processing is related to the length of the first target synchronization sequence, The shift amount is related to the number of values ​​of , and the shift amount conforms to the following formulas 10, 11, and 12:

[0100] and

[0101] or,

[0102] or,

[0103] and

[0104] in, Indicates rounding up; Indicates rounding down; round(·) indicates rounding up; N1 indicates the length of the first target synchronization sequence; P PSS instruct The number of values; 0≤i≤P PSS -1; N1≥P PSSIt should be understood that, on the basis that the shift amount is less than N1, the above formulas 10-12 (for example ) plus a constant, such as Where X1 is an integer.

[0105] For example, the length of the first target synchronization sequence is 127, and The number of possible values ​​is 3, and the shift amount can be 0, 43, 86 (rounded up) or 0, 42, 84 (rounded down or rounded up). The number of possible values ​​is 4, and the cyclic shift amount can be 0, 128, 256, 384 (rounded up or rounded off) or 0, 127, 254, 381 (rounded down).

[0106] In addition, different first synchronization sequences can be used to indicate different Value. For example, P PSS =3, using three different m-sequences. Different m-sequences have different generating polynomials, and their initial values ​​can be the same or different. It should be understood that, assuming s0 and s1 are two m-sequences with the same generating polynomial but different initial values, if the length N of both sequences is equal to a power of 2 minus 1, for example, 127, then s1 can be considered a cyclic shift of s0. In this case, s0 and s1 cannot be called two different first synchronization sequences.

[0107] As mentioned above, it is possible to use the synchronization signal, that is, the PSS, as the PBCH DMRS, so that there is no need to design the PBCH DMRS separately. In this case, the PSS may also need to indicate SSB index information.

[0108] Case 2: Synchronization signal is SSS

[0109] 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 the same as The second target synchronization sequence is used to indicate For example, The number of values ​​of is N2, so the number of second synchronization sequences is also N2. In practical applications, one of the N2 second synchronization sequences can be selected to obtain SSS by single-carrier modulation.

[0110] Different second target synchronization sequences can be used to indicate different For example, the second target synchronization sequence is an NR gold sequence or a Golay sequence, and different NR gold sequences or Golay sequences may have different initial values. The number of possible values ​​is the same.

[0111] Similar to the above-mentioned first synchronization sequence, the multiple second synchronization sequences may also be obtained by performing different cyclic shift processes on the preset second base synchronization sequence.

[0112] In this application, the shift amounts of different cyclic shift processing performed on the preset second base synchronization sequence and the preset third base synchronization sequence are all the same as the length of the second target synchronization sequence, The shift amount is in accordance with the following formulas 13, 14, and 15:

[0113] and

[0114] or,

[0115] or,

[0116] and

[0117] in, Indicates rounding up; Indicates rounding down; round(·) indicates rounding up; N2 indicates the length of the second target synchronization sequence; P SSS instruct The number of values; 0≤i≤P SSS -1; N2≥P SSS .

[0118] For example, the length of the second target synchronization sequence is 511, and The number of possible values ​​is 335. If rounding down is used, the shift amount can be 0, 1, 2, ..., 335.

[0119] It should be understood that, on the basis that the shift amount is less than N2, the shift amounts in the above formulas 13 to 15 (for example ) plus a constant, such as Where X2 is an integer.

[0120] 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. <P SSS When cyclic shifting the second base synchronization sequence is not enough to generate P SSSsecond synchronization sequences. In view of this situation, in the present application, multiple second synchronization sequences can also be obtained by performing different cyclic shift processing on the preset third base synchronization sequence and performing different cyclic shift processing on the preset fourth base synchronization sequence. The third base synchronization sequence cannot be obtained by cyclic shifting the fourth base synchronization sequence. For example, the length of the third base synchronization sequence and the fourth base synchronization sequence are both N2, which is the same length as the second synchronization sequence. The third base synchronization sequence is subjected to cyclic shift processing to obtain the third sequence, and the fourth base synchronization sequence is subjected to cyclic shift processing to obtain the fourth sequence. The second synchronization sequence, for example, can be the modulo-2 sum of the third sequence and the fourth sequence.

[0121] Assuming that the third base synchronization sequence and the fourth base synchronization sequence are denoted as s0 and s1 respectively, the cyclic shift combination (m0, m1) of the third sequence (corresponding to s0 with a cyclic shift amount of m0) and the fourth sequence (corresponding to s1 with a cyclic shift amount of m1) is indicated As shown in the following formula 16:

[0122] Where the integer d is equal to P SSS / P PSS , a is a positive integer, equal to The maximum value that can be taken is plus 1. It should be noted that the design of a suitable positive integer b can reduce the correlation between SSS sequences in the presence of residual frequency offset. In addition, if PSS uses s0 and its cyclic shift indication m0 and This can reduce the probability of PCI detection errors.

[0123] It should be understood that if the lengths of the third base synchronization sequence and the fourth base synchronization sequence are both N, and the third base synchronization sequence cannot be obtained from the fourth base synchronization sequence through cyclic shift, then there are at most N squared second synchronization sequences.

[0124] As mentioned above, it's possible to use the synchronization signal, or SSS, as the PBCH DMRS, eliminating the need for a separate PBCH DMRS. In existing NR protocols, the PBCH DMRS indicates some or all of the SSB index information. In this case, if the SSS is used as the PBCH DMRS, the SSS may also need to indicate some or all of the SSB index information.

[0125] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of device interaction. It is understandable that, in order to implement the above functions, each device may include a hardware structure and / or software module that performs each function. Those skilled in the art should easily appreciate that, in combination with the units and algorithm steps of each example 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 function is executed in a hardware or computer software driven hardware manner depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0126] In the embodiments of the present application, the functional units of the device can be divided according to the above method examples. For example, each functional unit can be divided according 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 software functional units.

[0127] In the case of an integrated unit, Figure 7 shows a possible exemplary block diagram of a communication device involved in an embodiment of the present application. As shown in Figure 7, 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 communication between the communication device 700 and other devices. Optionally, the transceiver unit 702 may include a receiving unit and / or a transmitting unit, respectively, for performing receiving and transmitting operations. Optionally, the communication device 700 may also include a storage unit for storing 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.

[0128] In one embodiment, the communication device 700 is a network device, the processing unit 701 is used to obtain SSB, the SSB includes: a PBCH signal and a synchronization signal, the PBCH signal is obtained by single-carrier modulation of the PBCH, and the synchronization signal is obtained by single-carrier modulation of the synchronization sequence; the transceiver unit 702 is used to send the SSB.

[0129] In another embodiment, the communication device 700 is a terminal, and the transceiver unit 702 is used to receive SSB, the SSB includes: a PBCH signal and a synchronization signal, the PBCH signal is obtained by single-carrier modulation of the PBCH, and the synchronization signal is obtained by single-carrier modulation of the synchronization sequence; the processing unit 701 is used to demodulate the synchronization signal and the PBCH signal.

[0130] In an optional manner, the PBCH signal is obtained by single-carrier modulating the PBCH using a first modulation parameter, where the first modulation parameter includes at least one of the following: a modulation method of symbols carried by the PBCH, a bandwidth of the PBCH signal, a number of symbols carried by the PBCH, or a first FDSS parameter.

[0131] In an optional manner, the processing unit 701 of the network device is specifically used to map the synchronization sequence into a π / 2-BPSK symbol sequence based on a π / 2-BPSK modulation mapper; and use a second modulation parameter to perform single-carrier modulation on the π / 2-BPSK symbol sequence to obtain a synchronization signal, and the second modulation parameter includes at least one of the following: the bandwidth of the synchronization signal, or a second FDSS parameter.

[0132] In an optional 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 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.

[0133] In an optional 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 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.

[0134] In an optional manner, the modulation mode of the symbols carried by the PBCH includes one of the following: QPSK modulation, or OFFSET-QPSK modulation, or π / 2-BPSK modulation.

[0135] In an optional manner, the synchronization signal is PSS and / or SSS.

[0136] In an optional manner, the synchronization signal is PSS, the synchronization sequence is a first target synchronization sequence among multiple preset first synchronization sequences, and the number of multiple 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.

[0137] In an optional manner, the multiple first synchronization sequences are obtained by performing different cyclic shift processes on a preset first base synchronization sequence.

[0138] In an optional manner, the shift amounts of different cyclic shift processes performed on the preset first base synchronization sequence are related to the length of the first target synchronization sequence and the number of values ​​of the physical layer cell identifier 2.

[0139] In an optional manner, the synchronization signal is SSS, the synchronization sequence is a second target synchronization sequence among multiple preset second synchronization sequences, and the number of multiple 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.

[0140] In an optional manner, the multiple second synchronization sequences are obtained by performing different cyclic shift processing on the preset second base synchronization sequence, or the multiple second synchronization sequences are obtained by performing different cyclic shift processing on the preset third base synchronization sequence and performing different cyclic shift processing on the preset fourth base synchronization sequence.

[0141] In an optional manner, the shift amounts of different cyclic shift processing 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.

[0142] In addition, Figure 8 shows a simplified schematic diagram of the structure of a terminal device provided by this application. For ease of understanding and illustration, Figure 8 uses a mobile phone as an example of a terminal. As shown in Figure 8, the terminal includes a processor, memory, radio frequency circuitry, an antenna, and input / output devices.

[0143] The processor is mainly used to process communication protocols and communication data, as well as control terminal devices, execute software programs, process software program data, etc.

[0144] Memory is mainly used to store software programs and data.

[0145] Radio frequency circuits are mainly used for conversion between baseband signals and radio frequency signals and for processing radio frequency signals.

[0146] Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves.

[0147] Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users.

[0148] It should be noted that some types of terminal devices may not have input and output devices.

[0149] When data needs to be sent, the processor performs baseband processing on the data to be transmitted and outputs the baseband signal to the RF circuit. The RF circuit then performs RF processing on the baseband signal and transmits it via the antenna in the form of electromagnetic waves. When data is sent to a terminal device, the RF circuit receives the RF signal via the antenna, converts it into a baseband signal, and outputs the baseband signal to the processor, which converts the baseband signal into data and processes it.

[0150] For ease of explanation, Figure 8 shows only one memory and processor. In actual terminal device products, one or more processors and one or more memories may exist. Memory may also be referred to as a storage medium or storage device. The memory may be provided independently of the processor or integrated with the processor, and this embodiment of the application does not impose any restrictions on this.

[0151] In the embodiment of the present application, the antenna and radio frequency circuit with transceiver functions can be regarded as the transceiver unit of the terminal device, and the processor with processing function can be regarded as the processing unit of the terminal device.

[0152] As shown in Figure 8, terminal 800 includes a transceiver unit 810 and a processing unit 820. Transceiver unit 810 may also be referred to as a transceiver, transceiver, transceiver device, etc. Processing unit 820 may also be referred to as a processor, processing board, processing module, processing device, etc.

[0153] Alternatively, the device in the transceiver unit 810 that implements the receiving function may be considered a receiving unit, and the device in the transceiver unit 810 that implements the transmitting function may be considered a transmitting unit. That is, the transceiver unit 810 includes a receiving unit and a transmitting unit. The transceiver unit may also be sometimes referred to as a transceiver, a transceiver, or a transceiver circuit. The receiving unit may also be sometimes referred to as a receiver, a receiver, or a receiving circuit. The transmitting unit may also be sometimes referred to as a transmitter, a transmitter, or a transmitting circuit.

[0154] It should be understood that the transceiver unit 810 is used to perform the sending and receiving operations of the terminal device in the above method embodiment, and the processing unit 820 is used to perform other operations except the sending and receiving operations on the terminal device in the above method embodiment.

[0155] When the terminal device is a chip, the chip includes a transceiver unit 810 and a processing unit 820. The transceiver unit 810 may be an input / output circuit or a communication interface; the processing unit 820 may be a processor, microprocessor, integrated circuit, or logic circuit integrated on the chip.

[0156] This application also provides a network device. Figure 9 shows a schematic diagram of the structure of a network device 900 provided in an embodiment of this application. This network device 900 can be applied to the system shown in Figure 1. For example, network device 900 can be a network device in the system shown in Figure 1, configured to perform the functions of the network device in the above-described method embodiment. It should be understood that the following is merely an example, and in future communication systems, network devices may have other forms and configurations.

[0157] For example, in a 5G communication system, the network device 900 may include a CU, a DU, and an AAU. Compared to 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 (BBU):

[0158] The non-real-time portion of the original BBU will be separated and redefined as a CU, responsible for handling non-real-time protocols and services. Some of the BBU's physical layer processing functions will be merged with the original RRU and passive antennas into the AAU. The remaining BBU functions will be redefined as a DU, responsible for handling physical layer protocols and real-time services. In short, the CU and DU are differentiated by the real-time nature of their processing, and the AAU is a combination of the RRU and antenna.

[0159] The CU, DU, and AAU can be deployed separately or together, resulting in a variety of network deployment configurations. One possible deployment configuration, shown in Figure 9, is consistent with traditional 4G network equipment, with the CU and DU deployed on shared hardware. It should be understood that Figure 9 is merely an example and does not limit the scope of protection of this application. For example, deployment configurations may also include the DU being deployed in the BBU room, the CU being deployed centrally, or the DU being deployed centrally, with the CU being centralized at a higher level.

[0160] The AAU 1000 can implement transceiver functions and correspond to the transceiver unit 702 in Figure 7. Optionally, the AAU 1800 can also be called a transceiver, a transceiver circuit, or a transceiver, and can 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, a receiving circuit), and the transmitting unit can correspond to a transmitter (or a transmitter, a transmitting circuit). The CU and DU 1100 can implement internal processing functions and correspond to the processing unit 701 in Figure 7. Optionally, the CU and DU 1100 can control network devices and can be called controllers. The AAU, CU, and DU can be physically arranged together or physically separated.

[0161] In addition, the network equipment is not limited to the form shown in Figure 9, but 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 customer premises equipment (CPE), or it can be other forms, which are not limited in this application.

[0162] In one example, the CU and DU1100 may be composed of one or more single boards, and multiple single boards may jointly support a wireless access network with a single access standard (such as an LTE network), or may respectively support wireless access networks with different access standards (such as an LTE network, a 5G network, a future network or other networks). The CU and DU1100 also 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, such as controlling the network device to execute the operation process of the network device in the above method embodiment. The memory 1101 and the processor 1102 can serve one or more single boards. That is, a memory and a processor can be set separately on each single board. Alternatively, multiple single boards may share the same memory and processor. In addition, necessary circuits may be set on each single board.

[0163] It should be understood that the network device 900 shown in Figure 9 is capable of implementing the network device functions involved in the method embodiment of Figure 5. The operations and / or functions of the various units in the network device 1700 are respectively for implementing the corresponding processes performed by the network device in the method embodiment of the present application. To avoid repetition, detailed descriptions are appropriately omitted here. The structure of the network device illustrated in Figure 9 is only one possible form and should not constitute any limitation on 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.

[0164] The CU and DU 1100 can be used to perform the actions implemented within the network device described in the previous method embodiments, while the AAU 1000 can be used to perform the actions described in the previous method embodiments in which the network device sends or receives data to or from the terminal device. For details, please refer to the description in the previous method embodiments and will not be repeated here.

[0165] The present application also provides a communication system including a terminal device and a network device. The terminal device is configured to execute all or part of the steps executed by the terminal device in the embodiment shown in FIG. 5 . The network device is configured to execute all or part of the steps executed by the network device in the embodiment shown in FIG. 5 .

[0166] Based on the above embodiments, embodiments of the present application further provide a readable storage medium storing instructions that, when executed, implement the method of any of the above embodiments. The readable storage medium may include a USB flash drive, a mobile hard drive, a read-only memory, a random access memory, a magnetic disk, or an optical disk, among other media capable of storing program code.

[0167] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, compact disc read-only memory (CD-ROM), optical storage, etc.) containing computer-usable program code.

[0168] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0169] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0170] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

Claims

1. A communication method, characterized in that: Applied to network equipment, including: Obtaining a synchronization signal block SSB, the SSB comprising: a PBCH signal and a synchronization signal, the PBCH signal being obtained by adopting single carrier modulation on the PBCH, and the synchronization signal being obtained by adopting single carrier modulation on the synchronization sequence; The SSB is sent.

2. A communication method, characterized in that: Applied to terminals, including: Receive a synchronization signal block SSB, the SSB including: a PBCH signal and a synchronization signal, the PBCH signal is obtained by adopting single carrier modulation on the PBCH, and the synchronization signal is obtained by adopting single carrier modulation on the synchronization sequence; The synchronization signal and the PBCH signal are demodulated.

3. The method according to claim 1 or 2, characterized in that: The PBCH signal is obtained by single-carrier modulating the PBCH using a first modulation parameter, wherein the first modulation parameter includes at least one of the following: a modulation method of symbols carried by the PBCH, a bandwidth of the PBCH signal, a number of symbols carried by the PBCH, or a 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 into a π / 2-BPSK symbol sequence; The π / 2-BPSK symbol sequence is subjected to single-carrier modulation by adopting a second modulation parameter to obtain the synchronization signal, wherein the second modulation parameter includes at least one of the following: a bandwidth of the synchronization signal, or a second FDSS parameter.

5. The method according to any one of claims 1 to 4, characterized in that: 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 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 mode 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 to 6, characterized in that: The modulation mode of the symbols carried by the PBCH includes one of the following: quadrature phase shift keying QPSK modulation, offset quadrature phase shift keying OFFSET-QPSK modulation, or π / 2-BPSK modulation.

8. The method according to any one of claims 1 to 7, characterized in that: The synchronization signal is a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

9. The method according to any one of claims 1 to 8, characterized in that: The synchronization signal is a 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, characterized in that The multiple first synchronization sequences are obtained by performing different cyclic shift processes on a preset first base synchronization sequence.

11. The method according to claim 10, characterized in that The shift amounts of the different cyclic shift processes performed on the preset first base synchronization sequence are 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 to 8, 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, characterized in that The multiple second synchronization sequences are obtained by performing different cyclic shift processing on a preset second base synchronization sequence, or the multiple second synchronization sequences are obtained by performing different cyclic shift processing on a preset third base synchronization sequence and performing different cyclic shift processing on a preset fourth base synchronization sequence.

14. The method according to claim 13, characterized in that The shift amounts of the different cyclic shift processing 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.

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

16. A communication device, characterized in that: include: at least one processor and memory; The memory is used to store computer programs or instructions; The at least one processor is configured to execute the computer program or instructions so that the method according to any one of claims 1 to 14 is performed.

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

19. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed on a computer, the method according to any one of claims 1 to 14 is executed.

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