Synchronization signal transmission method, device and system

Abstract

The embodiment of the invention provides a synchronization signal transmission method, device and system, which are used for realizing synchronization signals compatible with different types of terminal devices. The method comprises: determining a synchronization signal comprising a plurality of subsequences, each of the plurality of subsequences being mapped to a subcarrier of orthogonal frequency division multiplexing (OFDM), the bandwidth of the synchronization signal being greater than or equal to the bandwidth of any one of the plurality of subsequences; and sending a synchronization signal to the terminal device, wherein the synchronization signal is used for the terminal device to execute downlink synchronization.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a method, device and system for transmitting a synchronization signal. Background Art

[0002] In order to successfully enable the terminal device to initially access the cellular network, the network device will periodically send a synchronization signal to the terminal device. Exemplarily, when the cellular network is a long term evolution (LTE) network or a new radio (NR) network, the synchronization signal may include a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and the network device will also periodically send a physical broadcast channel (PBCH) to the terminal device. In the NR system, the synchronization signal and PBCH can be collectively referred to as a synchronization signal and a physical broadcast channel block (SSB).

[0003] Currently, cellular networks support both broadband and narrowband terminal devices, such as narrowband Internet of Things (NB-IoT) terminal devices. The bandwidth of the synchronization signal for broadband terminal devices is relatively wide, which exceeds the frequency domain range that narrowband terminal devices can receive, so narrowband terminal devices cannot normally receive the above synchronization signals for broadband terminal devices. For this reason, different synchronization signals are designed for broadband terminal devices and narrowband terminal devices, which increases the complexity of cellular network system design. Summary of the invention

[0004] The embodiments of the present application provide a synchronization signal transmission method, device and system for realizing synchronization signals compatible with different types of terminal devices.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, a method for transmitting a synchronization signal is provided, and a device for executing the method for transmitting the synchronization signal may be a network device, or may be a module applied to the network device, such as a chip or a chip system. The method for transmitting the synchronization signal includes: determining a synchronization signal including a plurality of subsequences, wherein the plurality of subsequences constitute a long sequence, wherein each subsequence in the plurality of subsequences is mapped to a subcarrier of orthogonal frequency division multiplexing OFDM, and wherein the bandwidth of the synchronization signal is greater than or equal to the bandwidth of any subsequence in the plurality of subsequences; and sending the synchronization signal to a terminal device, wherein the synchronization signal is used for the terminal device to perform downlink synchronization.

[0007] In the synchronization signal transmission method provided in the embodiment of the present application, the synchronization signal may include multiple subsequences, so that the broadband terminal device can receive the synchronization signal including all subsequences, and the narrowband terminal device can receive one or more subsequences in the synchronization signal. For the broadband terminal device and the narrowband terminal device, the embodiment of the present application can adopt the same synchronization signal transmission structure, thereby reducing the complexity of the cellular network system design and achieving the technical effect of saving time and frequency resources.

[0008] In combination with the first aspect, in a possible implementation, the number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal. Simulation results show that in this solution, the subsequence has a better ambiguity function performance, specifically, the correlation value of the sequence has a lower side lobe at the corresponding error delay and / or Doppler frequency offset.

[0009] In combination with the above first aspect, in a possible implementation manner, the subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

[0010] In combination with the first aspect above, in a possible implementation manner, the first subsequence included in the synchronization signal is a multi-phase sequence; and the general term of the first subsequence satisfies the following formula:

[0011]

[0012] Wherein, a, b, c, d, p, q are constants; n = 1, 2, ..., N, N represents the length of the first subsequence, N is a positive integer; k = 1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, K is a positive integer. In particular, p = 3, q ​​= 2.

[0013] In combination with the above first aspect, in a possible implementation manner, the synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

[0014] In combination with the first aspect above, in a possible implementation, the number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same. In this solution, the PSS and the SSS may have the same number and / or length of subsequences. This will enable the terminal device, especially the second type of terminal device, to receive the PSS and SSS with comparable performance.

[0015] In combination with the first aspect above, in a possible implementation, each subsequence included in the PSS or the SSS occupies the same time domain resources. In this solution, the multiple subsequences included in the PSS or SSS can be mapped to multiple consecutive subcarriers of OFDM. Since the long sequence included in the synchronization signal in the existing synchronization signal transmission method is mapped to multiple consecutive subcarriers of OFDM, this solution can increase compatibility with the existing synchronization signal transmission method.

[0016] In combination with the first aspect above, in a possible implementation, each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources. In this solution, for terminal devices, especially the second type of terminal devices, the SSS may not be limited by bandwidth, so that the SSS may include more subsequences, or the SSS may carry more information.

[0017] In combination with the first aspect above, in a possible implementation, the method further includes: sending a first physical broadcast channel PBCH; wherein the bandwidth occupied by the first PBCH is wider than or equal to the bandwidth occupied by the synchronization signal. In this solution, respective PBCHs can be designed for two different types of terminal devices. The first PBCH is suitable for broadband terminal devices because it occupies more frequency domain resources.

[0018] In combination with the above-mentioned first aspect, in a possible implementation manner, the frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

[0019] In combination with the first aspect above, in a possible implementation, the method further includes: sending a second PBCH; wherein the bandwidth occupied by the first PBCH is wider than the bandwidth occupied by the second PBCH. In this solution, respective PBCHs can be designed for two different types of terminal devices. The second PBCH is suitable for narrowband terminal devices because it occupies fewer frequency domain resources.

[0020] In combination with the above-mentioned first aspect, in a possible implementation manner, the frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

[0021] In combination with the first aspect above, in a possible implementation, the synchronization signal includes indication information, and the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH. In this solution, the time-frequency resource position of the second PBCH can be flexible, and the synchronization signal can carry more information.

[0022] In combination with the first aspect above, in a possible implementation, the synchronization signal includes a beam index, and the beam index is used by the terminal device to send data and / or signaling on the beam corresponding to the beam index. This solution can be applied to non-initial access of the terminal device, for example, the terminal device requests access to the network device again after the sleep ends. In this case, the terminal device does not need to receive the PBCH, and can directly send data and / or signaling to the network device on the beam corresponding to the beam index, thereby achieving a technical effect of energy saving.

[0023] In the second aspect, a method for transmitting a synchronization signal is provided, and the device for executing the method for transmitting the synchronization signal may be a terminal device, or may be a module applied to the terminal device, such as a chip or a chip system. The method for transmitting the synchronization signal includes: when the terminal device is a terminal device of the first type, receiving a synchronization signal from a network device, the synchronization signal includes a plurality of subsequences, the plurality of subsequences constitute a long sequence, each of the plurality of subsequences is mapped to a subcarrier of orthogonal frequency division multiplexing OFDM, and the bandwidth of the synchronization signal is greater than or equal to the bandwidth of any one of the plurality of subsequences; performing downlink synchronization according to the synchronization signal; or, when the terminal device is a terminal device of the second type, receiving one or more subsequences in the synchronization signal from the network device; performing downlink synchronization according to one or more subsequences in the synchronization signal; wherein the bandwidth of the signal received by the terminal device of the first type is wider than the bandwidth of the signal received by the terminal device of the second type.

[0024] In combination with the above second aspect, in a possible implementation manner, the number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal.

[0025] In combination with the second aspect above, in a possible implementation manner, the subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

[0026] In combination with the second aspect, in a possible implementation manner, the first subsequence included in the synchronization signal is a multi-phase sequence; and the general term of the first subsequence satisfies the following formula:

[0027]

[0028] Among them, a, b, c, d, p, q are constants; n=1, 2, ..., N, N represents the length of the first subsequence, and N is a positive integer; k=1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, and K is a positive integer.

[0029] In combination with the above second aspect, in a possible implementation manner, the synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

[0030] In combination with the above-mentioned second aspect, in a possible implementation manner, the number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same.

[0031] In combination with the above second aspect, in a possible implementation manner, each subsequence included in the PSS or the SSS occupies the same time domain resources.

[0032] In combination with the above second aspect, in a possible implementation manner, each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources.

[0033] In combination with the above-mentioned second aspect, in a possible implementation, the terminal device is a terminal device of the first type; the method also includes: receiving a first PBCH; wherein a bandwidth occupied by the first PBCH is wider than or equal to a bandwidth occupied by the synchronization signal.

[0034] In combination with the above second aspect, in a possible implementation manner, the frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

[0035] In combination with the above-mentioned second aspect, in a possible implementation manner, the terminal device is a second type of terminal device; the method also includes: receiving a second PBCH; wherein a bandwidth occupied by the first PBCH is wider than a bandwidth occupied by the second PBCH.

[0036] In combination with the above second aspect, in a possible implementation manner, the frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

[0037] In combination with the above second aspect, in a possible implementation manner, the synchronization signal includes indication information, where the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH.

[0038] In combination with the above-mentioned second aspect, in a possible implementation method, the synchronization signal includes a beam index, and the beam index is used by the terminal device to send data and / or signaling to the network device on the beam corresponding to the beam index.

[0039] In a third aspect, a communication device is provided for implementing the above method. The communication device includes a module, unit, or means corresponding to the above method, and the module, unit, or means can be implemented by hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

[0040] In combination with the third aspect above, in a possible implementation, the communication device includes: a synchronization signal determination module and a transceiver module. The synchronization signal determination module is used to determine a synchronization signal including multiple subsequences, the multiple subsequences constitute a long sequence, each subsequence in the multiple subsequences is mapped to a subcarrier of orthogonal frequency division multiplexing OFDM, and the bandwidth of the synchronization signal is greater than or equal to the bandwidth of any subsequence in the multiple subsequences; the transceiver module is used to send the synchronization signal to the terminal device, and the synchronization signal is used for the terminal device to perform downlink synchronization.

[0041] In combination with the third aspect above, in a possible implementation manner, the number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal.

[0042] In combination with the third aspect above, in a possible implementation manner, the subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

[0043] In combination with the third aspect, in a possible implementation manner, the first subsequence included in the synchronization signal is a multi-phase sequence; and the general term of the first subsequence satisfies the following formula:

[0044]

[0045] Among them, a, b, c, d, p, q are constants; n=1, 2, ..., N, N represents the length of the first subsequence, and N is a positive integer; k=1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, and K is a positive integer.

[0046] In combination with the third aspect above, in a possible implementation manner, the synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

[0047] In combination with the third aspect above, in a possible implementation, the number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same.

[0048] In combination with the third aspect above, in a possible implementation manner, each subsequence included in the PSS or the SSS occupies the same time domain resources.

[0049] In combination with the third aspect above, in a possible implementation manner, each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources.

[0050] In combination with the third aspect, in a possible implementation, the transceiver module is further configured to send a first physical broadcast channel PBCH; wherein a bandwidth occupied by the first PBCH is wider than or equal to a bandwidth occupied by the synchronization signal,

[0051] In combination with the third aspect above, in a possible implementation manner, the frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

[0052] In combination with the third aspect above, in a possible implementation manner, the transceiver module is further used to send a second PBCH; a bandwidth occupied by the first PBCH is wider than a bandwidth occupied by the second PBCH.

[0053] In combination with the third aspect above, in a possible implementation manner, the frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

[0054] In combination with the third aspect above, in a possible implementation manner, the synchronization signal includes indication information, where the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH.

[0055] In combination with the third aspect above, in a possible implementation, the synchronization signal includes a beam index, and the beam index is used by the terminal device to send data and / or signaling to the network device on the beam corresponding to the beam index.

[0056] In a fourth aspect, a communication device is provided for implementing the above method. The communication device includes a module, unit, or means corresponding to the above method, and the module, unit, or means can be implemented by hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

[0057] In combination with the fourth aspect above, in a possible implementation, the communication device includes: a transceiver module and a synchronization module. In the case where the communication device is a first type of communication device, the transceiver module is used to receive a synchronization signal from a network device, the synchronization signal includes multiple subsequences, the multiple subsequences constitute a long sequence, each of the multiple subsequences is mapped to a subcarrier of orthogonal frequency division multiplexing OFDM, and the bandwidth of the synchronization signal is greater than or equal to the bandwidth of any subsequence in the multiple subsequences; the synchronization module is used to perform downlink synchronization according to the synchronization signal; or, in the case where the communication device is a second type of communication device, the transceiver module is used to receive one or more subsequences in the synchronization signal from the network device; the synchronization module is used to perform downlink synchronization according to one or more subsequences in the synchronization signal; wherein the bandwidth of the received signal of the first type of communication device is wider than the bandwidth of the received signal of the second type of communication device.

[0058] In combination with the fourth aspect above, in a possible implementation manner, the number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal.

[0059] In combination with the fourth aspect above, in a possible implementation manner, the subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

[0060] In combination with the fourth aspect, in a possible implementation manner, the first subsequence included in the synchronization signal is a multi-phase sequence; and the general term of the first subsequence satisfies the following formula:

[0061]

[0062] Among them, a, b, c, d, p, q are constants; n=1, 2, ..., N, N represents the length of the first subsequence, and N is a positive integer; k=1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, and K is a positive integer.

[0063] In combination with the fourth aspect above, in a possible implementation manner, the synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

[0064] In combination with the fourth aspect above, in a possible implementation, the number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same.

[0065] In combination with the fourth aspect above, in a possible implementation manner, each subsequence included in the PSS or the SSS occupies the same time domain resources.

[0066] In combination with the fourth aspect above, in a possible implementation manner, each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources.

[0067] In combination with the fourth aspect above, in a possible implementation, the communication device is a first type of communication device; the transceiver module is also used to receive a first PBCH; wherein a bandwidth occupied by the first PBCH is wider than or equal to a bandwidth occupied by the synchronization signal.

[0068] In combination with the fourth aspect above, in a possible implementation manner, the frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

[0069] In combination with the fourth aspect above, in a possible implementation, the communication device is a second type of communication device; the transceiver module is further used to receive a second PBCH; wherein a bandwidth occupied by the first PBCH is wider than a bandwidth occupied by the second PBCH.

[0070] In combination with the fourth aspect above, in a possible implementation manner, the frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

[0071] In combination with the fourth aspect above, in a possible implementation manner, the synchronization signal includes indication information, where the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH.

[0072] In combination with the fourth aspect above, in a possible implementation, the synchronization signal includes a beam index, and the beam index is used by the communication device to send data and / or signaling to the network device on the beam corresponding to the beam index.

[0073] In a fifth aspect, a communication device is provided, comprising: a processor; the processor is used to couple with a memory, and after reading a computer instruction stored in the memory, execute the method as described in the first aspect or the second aspect according to the instruction.

[0074] In combination with the fifth aspect above, in a possible implementation, the communication device also includes a memory; the memory is used to store computer instructions.

[0075] In conjunction with the fifth aspect, in a possible implementation, the communication device further includes a communication interface; the communication interface is used for the communication device to communicate with other devices. Exemplarily, the communication interface can be a transceiver, an input / output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit, etc.

[0076] In conjunction with the fifth aspect, in a possible implementation, the communication device may be a chip or a chip system. When the communication device is a chip system, the communication device may be composed of a chip, or may include a chip and other discrete devices.

[0077] In conjunction with the fifth aspect, in a possible implementation, when the communication device is a chip or a chip system, the communication interface may be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip or the chip system. The processor may also be embodied as a processing circuit or a logic circuit.

[0078] In a sixth aspect, a communication system is provided, comprising: a network device executing the method described in the first aspect above, and a terminal device executing the method described in the second aspect above.

[0079] In a seventh aspect, a computer-readable storage medium is provided, wherein instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer can execute the method described in the first aspect or the second aspect above.

[0080] In an eighth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute the method described in any one of the first or second aspects above.

[0081] Among them, the technical effects brought about by any possible implementation method of the second to eighth aspects can refer to the technical effects brought about by the above-mentioned first aspect or different implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 A schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0083] Figure 2 A schematic diagram of the structure of the communication device provided in the embodiment of the present application Figure 1 ;

[0084] Figure 3 A flowchart of a synchronization signal transmission method provided in an embodiment of the present application;

[0085] Figure 4 A method for transmitting a synchronization signal and PBCH provided in an embodiment of the present application Figure 1 ;

[0086] Figure 5 A method for transmitting a PBCH synchronization signal provided in an embodiment of the present application Figure 2 ;

[0087] Figure 6 A schematic diagram of a synchronization signal and PBCH provided in an embodiment of the present application;

[0088] Figure 7 A schematic diagram of another synchronization signal and PBCH provided in an embodiment of the present application;

[0089] Figure 8 A schematic diagram of the structure of the communication device provided in the embodiment of the present application Figure 2 ;

[0090] Fig. 9 A schematic diagram of the structure of the communication device provided in the embodiment of the present application Figure 3 . DETAILED DESCRIPTION

[0091] In order to facilitate understanding of the technical solutions of the embodiments of the present application, a brief introduction to the relevant technologies or terms of the present application is first given as follows.

[0092] First, the application scenarios of sequences.

[0093] A sequence can be a set of numbers or a set of elements arranged in order. In different scenarios, a specific sequence can use its own structure and properties to achieve specific functions. The following will explain the application scenarios and functions of sequences.

[0094] In a communication system, a terminal device needs to access a network after being powered on. However, the terminal device does not know the prior information of the network, and thus cannot normally receive information from the network device. Therefore, the terminal device first needs to search the network and determine information such as timing information and frequency resources used by the network. In order for the terminal device to obtain this information, the network device can periodically send a synchronization signal carried on a synchronization channel to the terminal device. Among them, the synchronization signal can be generated according to a predefined sequence or one of multiple long sequences. Accordingly, the terminal device can search for the synchronization signal at multiple preset frequency points according to a predefined long sequence or a long sequence that may be received. Once the terminal device searches for the synchronization signal, it means that the network has been successfully searched. Afterwards, the terminal device can perform time synchronization, as well as frequency offset estimation and compensation, so as to subsequently receive signal system broadcast information and other signals. It can be seen that the sequence plays an important role in the initial synchronization process. Furthermore, the detection performance of the sequence, as well as the ability to resist frequency deviation, interference and noise, determine whether the terminal device can successfully access the network and the speed of successful access to the network. The detection performance of the sequence can be characterized by sequence correlation.

[0095] Since the above synchronization signal is sent by the network device to the terminal device, the above synchronization signal can also be called a downlink synchronization signal, and the above synchronization process can also be called an uplink synchronization. In addition to downlink synchronization, the sequence can also be applied to uplink synchronization. Specifically, after obtaining the information required to access the network, the terminal device can attempt to communicate with the network device to notify the network device of its existence and cooperate with the network device to complete the subsequent access process. Similar to downlink synchronization, the terminal device can send an uplink synchronization signal on a reserved random access resource. Among them, the uplink synchronization signal may include an uplink long sequence. Accordingly, the network device will detect the uplink synchronization signal on each reserved random access resource to know whether there is a terminal device requesting to access the network. While detecting the uplink synchronization signal, the network device will also estimate the uplink timing advance parameter and send the estimation result to the terminal device. The terminal device can adjust the timing of its own uplink transmission according to the estimation result, so that the uplink transmission of multiple terminal devices can achieve frame, subframe, time slot or symbol level synchronization. It can be seen that the detection performance of the sequence, as well as the ability to resist frequency offset, interference and noise also determine the detection performance of the uplink random access request and the performance of the uplink timing advance parameter estimation.

[0096] In addition to synchronization scenarios, sequences can also be used in multiple access systems. For example, code division multiple access can use sequences as spreading codes, and different terminal devices use different spreading codes. Since the spreading codes can be orthogonal, when a network device uses the spreading code of a certain terminal device during reception, it can eliminate the influence of information from other terminal devices, thereby completing the reception of information from a specific terminal device. Similarly, in resource reuse and information transmission scenarios, such as pilot multiplexing scenarios, sequences can be used as a means of code division. It can be seen that sequence correlation affects the performance of multiple access systems.

[0097] Sequences can also be used in the design of low peak to average power ratio (PAPR) signals. For communication systems that use orthogonal frequency division multiplexing (OFDM) or similar frequency domain modulation as waveforms, one of the important factors to be considered may be the PAPR of the signal, especially the uplink signal, including the PAPR of the uplink random access signal and / or the uplink pilot signal. In the above communication system, the characteristics of a specific sequence can be used to design a low PAPR signal.

[0098] In future communication systems, such as the sixth generation (6G) mobile communication system, the combination of communication and perception will be a new main feature. In the study of perception and communication perception integration, the sequence can affect the realization and performance of the perception function. Specifically, during the wireless transmission of the signal, a time delay will be generated due to the transmission distance, and a frequency offset, namely, Doppler frequency deviation, will be generated due to the relative movement between the transceiver and the receiver. The target to be detected can send a specific sequence known to both the transceiver and the receiver. Accordingly, the receiving end can detect the time delay and Doppler frequency deviation of the received specific sequence transmitted through the channel relative to the specific sequence, thereby calculating the distance and speed information of the target to be detected. In order to achieve better perception performance, the specific sequence needs to have better fuzzy function performance. Specifically, the correlation value of the specific sequence has a peak value at the corresponding correct time delay and / or Doppler frequency deviation, and has a lower side lobe at the corresponding incorrect time delay and / or Doppler frequency deviation.

[0099] In addition to the above application scenarios, sequences are also widely used in scenarios including scrambling, encryption, and codebook generation in precoding of communication systems. In short, the future research trend for sequences is to achieve better performance in solving classic problems on the one hand, and to propose new sequence designs and expand new application scenarios on the other hand. Since the definitions of sequences in existing systems are numerous and complex, and lack a systematic definition method, it is urgent to study systematic sequence generation methods that are applicable to a variety of scenarios and have multiple functions in future communication systems.

[0100] Second, the existing method of transmitting synchronization signals.

[0101] In a possible implementation, the synchronization signal including the PSS and the SSS may be sent in the SSB. The narrowband terminal device in the embodiment of the present application may be a device with narrowband receiving capability, or a device with narrowband transceiving capability. The broadband terminal device in the embodiment of the present application may be a device with broadband receiving capability, or a device with broadband transceiving capability. This is described uniformly and will not be repeated below.

[0102] In an LTE network, the transmission period of PSS or SSS may be 5 milliseconds (ms), and the transmission period of PBCH may be 10 ms. The length of the long sequence included in PSS may be 63, and SSS may include two long sequences of length 31. PBCH may occupy 6 resource blocks (RBs).

[0103] In the NR network, the period of SSB transmission for initial access can be 20ms. The long sequence included in the PSS can be the longest linear shift register sequence with a length of 127, and the long sequence included in the SSS can be a Gold sequence with a length of 127. Among them, the longest linear shift register sequence (maximal length linear shift register sequence) can also be called an m sequence. PSS and SSS can each occupy 12 RBs, and PBCH can occupy 20 RBs. In the NR network, SSB can include PSS, SSS and PBCH.

[0104] In an LTE network or NR network, the PSS or SSS sent by the base station to the UE includes a long sequence. In order to be able to receive the above synchronization signal normally, the minimum bandwidth of the terminal device to be accessed needs to meet the bandwidth requirement of the above synchronization signal, that is, the bandwidth of the terminal device to be accessed is greater than or equal to the bandwidth of the above synchronization signal. Therefore, the above design is only applicable to broadband terminal devices.

[0105] If the above design is applied to narrowband terminal devices, the narrowband terminal devices will not be able to normally receive the synchronization signal applicable to broadband terminal devices. Therefore, in the existing synchronization signal transmission method, additional synchronization signals are designed for narrowband terminal devices. This will increase the complexity of signal design on the network device side and cause a waste of time and frequency resources.

[0106] It is very likely that terminal devices with different capabilities access the same network will be a scenario for future wireless communications. For example, narrowband terminal devices and broadband terminal devices need to access the network at the same time. In order to simplify the implementation of this scenario, it is necessary to design a synchronization signal that can be applied to both broadband terminal devices and narrowband terminal devices. In the embodiment of the present application, the network device side does not distinguish between the types of terminal devices and uniformly sends synchronization signals including multiple subsequences. Accordingly, the terminal device can adopt different receiving modes according to its own type.

[0107] The technical solution in the embodiment of the present application will be described below in conjunction with the drawings in the embodiment of the present application. Among them, in the description of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship, for example, A / B can represent A or B; "and / or" in the present application is only a description of the associated relationship of associated objects, indicating that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. And, in the description of the present application, unless otherwise specified, "multiple" refers to two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second" and the like are used to distinguish the same items or similar items with substantially the same functions and effects. Those skilled in the art will understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not necessarily limit the differences. At the same time, in the embodiments of the present application, the words "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design solutions. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete manner for ease of understanding.

[0108] Figure 1 The schematic diagram of the architecture of the mobile communication system shown is a schematic diagram of the architecture of the communication system 1000 applied in the embodiment of the present application. Figure 1 As shown, the communication system includes a wireless access network 100 and a core network 200. Optionally, the communication system 1000 may also include the Internet 300. The wireless access network 100 may include at least one wireless access network device (such as Figure 1 110a and 110b), and may also include at least one terminal device (such as Figure 1120a-120j in the figure). The terminal device is connected to the wireless access network device by wireless means, and the wireless access network device is connected to the core network by wireless or wired means. The core network device and the wireless access network device can be independent and different physical devices, or the functions of the core network device and the logical functions of the wireless access network device can be integrated on the same physical device, or part of the functions of the core network device and part of the functions of the wireless access network device can be integrated on one physical device. Terminal devices and terminal devices, as well as wireless access network devices and wireless access network devices can be connected to each other by wired or wireless means. Figure 1 The figure is just a schematic diagram. The communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices. Figure 1 Not drawn in.

[0109] The radio access network device is an access device that the terminal device accesses to the communication system by wireless means. The radio access network device may be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in the fifth generation (5G) mobile communication system, a next generation base station in the 6G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc.; in another possible scenario, multiple radio access network (RAN) nodes collaborate to assist the terminal in achieving wireless access, and different RAN nodes respectively implement part of the functions of the base station. For example, a RAN node may be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. The CU and DU may be set separately, or may be included in the same network element, such as a baseband unit (BBU). The RU may be included in a radio frequency device or a radio frequency unit, for example, in a remote radio unit (RRU), an active antenna unit (AAU) or a remote radio head (RRH).

[0110] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in an open RAN (open RAN, ORAN) system, CU may also be called O-CU (open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application takes CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. The embodiments of the present application may be implemented by DU or RU.

[0111] The wireless access network device may be a macro base station (such as Figure 1 110a), or a micro base station or an indoor station (such as Figure 1 110b), may also be a relay node or a donor node, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device. For ease of description, the following description takes a base station as an example of a wireless access network device.

[0112] The terminal device is a device with wireless transceiver function, which can send signals to the base station or receive signals from the base station. The terminal device can also be called a terminal, user equipment (UE), mobile station, mobile terminal device, etc. The terminal device can be widely used in various scenarios, for example, device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, automatic driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal device can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, a drone, a helicopter, an airplane, a ship, a robot, a mechanical arm, a smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.

[0113] Base stations and terminal devices can be fixed or mobile. Base stations and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on airplanes, balloons, and artificial satellites. The embodiments of this application do not limit the application scenarios of base stations and terminal devices.

[0114] The roles of base stations and terminal devices can be relative, for example, Figure 1 The helicopter or drone 120i in the figure can be configured as a mobile base station. For the terminal devices 120j that access the wireless access network 100 through 120i, the terminal device 120i is a base station; but for the base station 110a, 120i is a terminal device, that is, 110a and 120i communicate through the wireless air interface protocol. Of course, 110a and 120i can also communicate through the interface protocol between base stations. In this case, relative to 110a, 120i is also a base station. Therefore, base stations and terminal devices can be collectively referred to as communication devices. Figure 1 110a and 110b in the figure may be referred to as communication devices having base station functions. Figure 1 120a-120j in the figure can be called communication devices with terminal equipment functions.

[0115] Base stations and terminal devices, base stations and base stations, and terminal devices and terminal devices can communicate through authorized spectrum, unauthorized spectrum, or both; they can communicate through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0116] Functions such as synchronization, channel estimation, and perception can be achieved between the base station and the terminal device through sequences. In the embodiment of the present application, the synchronization signal sent by the base station to the terminal device may include a long sequence. Accordingly, the terminal device can receive the synchronization signal from the base station according to its own type to achieve downlink synchronization. Among them, synchronization can be understood as the process of establishing time synchronization and / or frequency synchronization between the base station and the terminal device. Specifically, the transmitting end can send a specific sequence, that is, a long sequence. The receiving end can detect this specific sequence. Afterwards, the receiving end can adjust its own timing according to the time of the detected specific sequence, and / or the receiving end can adjust its own carrier frequency according to the frequency of the detected specific sequence. Or, afterwards, the receiving end can notify the transmitting end to adjust the timing and / or carrier frequency. For the downlink, the transmitting end can be a base station, and the receiving end can be a terminal device. For the uplink, the transmitting end can be a terminal device, and the receiving end can be a base station.

[0117] In the embodiments of the present application, the functions of the base station may also be performed by a module (such as a chip) in the base station, or by a control subsystem including the base station functions. The control subsystem including the base station functions here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, smart city, etc. The functions of the terminal device may also be performed by a module (such as a chip or a modem) in the terminal device, or by a device including the terminal device functions.

[0118] In this application, the base station sends a downlink signal or downlink information to the terminal device, and the downlink information is carried on the downlink channel; the terminal device sends an uplink signal or uplink information to the base station, and the uplink information is carried on the uplink channel. In order to communicate with the base station, the terminal device needs to establish a wireless connection with the cell controlled by the base station. The cell with which the terminal device has established a wireless connection is called the service cell of the terminal device. When the terminal device communicates with the service cell, it will also be interfered by signals from neighboring cells.

[0119] For example, the network device 110 provided in the embodiment of the present application may be Figure 1 110a or 110b in the embodiment of the present application, the terminal device 120 provided in the embodiment of the present application may be Figure 1 Any one of 120a-120j.

[0120] Optionally, the relevant functions of the terminal device or network device in the embodiment of the present application can be implemented by one device, or by multiple devices together, or by one or more functional modules in one device, and the embodiment of the present application does not specifically limit this. It is understandable that the above functions can be network elements in hardware devices, or software functions running on dedicated hardware, or a combination of hardware and software, or virtualization functions instantiated on a platform (e.g., a cloud platform).

[0121] For example, the relevant functions of the terminal device or network device in the embodiment of the present application can be Figure 2 It is implemented by the communication device 20 in.

[0122] Figure 2 FIG. 2 is a schematic diagram of the structure of a communication device 20 provided in an embodiment of the present application. The communication device 20 includes one or more processors 201, a communication line 202, and at least one communication interface ( Figure 2 The example in which the communication interface 204 and a processor 201 are included is merely exemplary), and a memory 203 may also be included optionally.

[0123] The processor 201 may be a CPU, a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application.

[0124] The communication line 202 may include pathways for connecting different components.

[0125] The communication interface 204 may be a transceiver module for communicating with other devices or communication networks, such as Ethernet, RAN, WLAN, etc. For example, the transceiver module may be a device such as a transceiver or a transceiver. Optionally, the communication interface 204 may also be a transceiver circuit located in the processor 201 to implement signal input and signal output of the processor.

[0126] The memory 203 may be a device with a storage function. For example, it may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory may exist independently and be connected to the processor via a communication line 202. The memory may also be integrated with the processor.

[0127] The memory 203 is used to store computer-executable instructions for executing the solution of the present application, and the execution is controlled by the processor 201. The processor 201 is used to execute the computer-executable instructions stored in the memory 203, thereby realizing the synchronization signal transmission method provided in the embodiment of the present application.

[0128] Alternatively, in an embodiment of the present application, the processor 201 may also perform processing-related functions in the synchronization signal transmission method provided in the following embodiments of the present application, and the communication interface 204 is responsible for communicating with other devices or communication networks, which is not specifically limited in the embodiments of the present application.

[0129] The computer-executable instructions in the embodiments of the present application may also be referred to as application program codes, which is not specifically limited in the embodiments of the present application.

[0130] In a specific implementation, as an embodiment, the processor 201 may include one or more CPUs, such as Figure 2 CPU0 and CPU1 in.

[0131] In a specific implementation, as an embodiment, the communication device 20 may include multiple processors, such as Figure 2 201 and processor 207 in the embodiment of the present invention. Each of these processors may be a single-CPU processor or a multi-CPU processor. The processor herein may refer to one or more devices, circuits, and / or processing cores for processing data (e.g., computer program instructions).

[0132] In a specific implementation, as an embodiment, the communication device 20 may further include an output device 205 and an input device 206. The output device 205 communicates with the processor 201 and may display information in a variety of ways.

[0133] The communication device 20 may be a general purpose device or a dedicated device. For example, the communication device 20 may be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, a vehicle-mounted terminal device, an embedded device, or a computer having Figure 2 The embodiment of the present application does not limit the type of the communication device 20.

[0134] The following will be combined Figure 1 and Figure 2 The synchronization signal transmission method provided in the embodiment of the present application is specifically described.

[0135] like Figure 3 As shown, a synchronization signal transmission method provided in an embodiment of the present application includes the following steps:

[0136] Step S301: A network device determines a synchronization signal including multiple subsequences.

[0137] In the embodiment of the present application, determining a signal can be understood as generating a signal, or obtaining a predefined signal. The embodiment of the present application does not impose any limitation on the determination method.

[0138] The bandwidth of the synchronization signal is greater than or equal to the bandwidth of any subsequence in the multiple subsequences.

[0139] The multiple subsequences in the embodiment of the present application may constitute a complete sequence, that is, a long sequence included in the synchronization signal in the existing synchronization signal transmission method. In the embodiment of the present application, each subsequence may be mapped to multiple subcarriers of OFDM in the frequency domain.

[0140] In this embodiment of the present application, the number of subsequences included in the synchronization signal is greater than or equal to 2.

[0141] Optionally, the number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal. In this scheme, the long sequence can be equally divided into K subsequences, that is, the number of subsequences included in the synchronization signal can be expressed as K. The length of the subsequence can be expressed as N. Exemplarily, K=N=11. Simulation results show that in this scheme, the subsequence has a better ambiguity function performance, specifically, the correlation value of the sequence has a lower side lobe at the corresponding error delay and / or Doppler frequency offset.

[0142] In the embodiment of the present application, the values ​​of K and N may also be different. In addition, the lengths of the multiple subsequences included in the synchronization signal may also be different, that is, the long sequence may be divided into K subsequences, and the lengths of at least two subsequences in the K subsequences are different. The embodiment of the present application does not impose any limitation on this.

[0143] Optionally, the subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

[0144] Optionally, the first subsequence included in the synchronization signal is a multi-phase sequence; the general term of the first subsequence satisfies the following formula (1):

[0145]

[0146] Wherein, a, b, c, d, p, q are constants; n = 1, 2, ..., N, N represents the length of the first subsequence, N is a positive integer; k = 1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, K is a positive integer. In particular, p = 3, q ​​= 2, then the above formula (1) can be expressed as formula (2):

[0147]

[0148] The synchronization signal in the embodiment of the present application includes PSS and / or SSS.

[0149] Optionally, the number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same. In this scheme, the PSS and SSS can have the same sequence structure design, that is, the same number and / or length of subsequences. This will make the performance of receiving PSS and SSS equivalent to that of the terminal device, especially the second type of terminal device. In other words, the way of dividing subsequences is the same for PSS and SSS. In the case where the number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, the long sequence can also be divided into multiple subsequences unequally.

[0150] In a possible implementation, the PSS and the SSS may have the same number and length of subsequences, and the general term of each subsequence may satisfy the above formula (1) or formula (2).

[0151] Optionally, each subsequence included in the PSS or SSS occupies the same time domain resources. In this scheme, the multiple subsequences included in the PSS or SSS can be mapped to multiple consecutive subcarriers of OFDM. Since the long sequence included in the synchronization signal in the existing synchronization signal transmission method is mapped to multiple consecutive subcarriers of OFDM, this scheme can increase compatibility with the existing synchronization signal transmission method.

[0152] In the embodiment of the present application, the PSS and SSS may also have different sequence structure designs. In other words, for the PSS and SSS, the subsequences are divided in different ways. The embodiment of the present application does not impose any limitation on this.

[0153] In a possible implementation, the PSS and SSS may have different sequence structure designs, but the general term of each subsequence may satisfy the above formula (1) or formula (2).

[0154] Optionally, each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources. In this scheme, the multiple subsequences included in the PSS can be mapped to multiple consecutive subcarriers of OFDM. The multiple subsequences included in the SSS can be mapped to multiple consecutive OFDM symbols, and each subsequence included in the SSS can be mapped to multiple consecutive subcarriers of OFDM. For terminal devices, especially the second type of terminal devices, the SSS may not be limited by bandwidth, so that the SSS can include more subsequences, or the SSS can carry more information.

[0155] Step S302: The network device sends a synchronization signal to the terminal device.

[0156] When the terminal device is a terminal device of the first type, the following step S303 is performed:

[0157] Step S303: The terminal device receives a synchronization signal from the network device and performs downlink synchronization according to the synchronization signal.

[0158] Alternatively, when the terminal device is a terminal device of the second type, the following step S304 is performed:

[0159] Step S304: The terminal device receives one or more subsequences in a synchronization signal from the network device, and performs downlink synchronization according to the one or more subsequences in the synchronization signal.

[0160] Exemplarily, the second type of terminal device in the embodiment of the present application may be a NB-IoT terminal device.

[0161] In the synchronization signal transmission method provided in the embodiment of the present application, the synchronization signal may include multiple subsequences, so that the broadband terminal device can receive the synchronization signal including all subsequences, and the narrowband terminal device can receive one or more subsequences in the synchronization signal. For the broadband terminal device and the narrowband terminal device, the embodiment of the present application can adopt the same synchronization signal transmission structure, thereby reducing the complexity of the cellular network system design and achieving the technical effect of saving time and frequency resources.

[0162] Optionally, the synchronization signal transmission method provided in the embodiment of the present application further includes: the network device sends a first PBCH to the terminal device. The bandwidth occupied by the first PBCH is wider than or equal to the bandwidth occupied by the synchronization signal. In this scheme, respective PBCHs can be designed for two different types of terminal devices. The first PBCH is suitable for broadband terminal devices because it occupies more frequency domain resources. The first PBCH in the embodiment of the present application may also be referred to as a broadband PBCH.

[0163] Optionally, the synchronization signal transmission method provided in the embodiment of the present application further includes: the network device sends a second PBCH to the terminal device. The bandwidth occupied by the first PBCH is wider than the bandwidth occupied by the second PBCH. In this scheme, respective PBCHs can be designed for two different types of terminal devices. The second PBCH is suitable for narrowband terminal devices because it occupies fewer frequency domain resources. The second PBCH in the embodiment of the present application may also be referred to as a narrowband PBCH.

[0164] It should be noted that the network device needs to determine the first PBCH before sending the first PBCH to the terminal device. The network device needs to determine the second PBCH before sending the second PBCH to the terminal device.

[0165] In the embodiment of the present application, determining the PBCH can be understood as generating the PBCH, or obtaining a predefined PBCH. The embodiment of the present application does not impose any limitation on the determination method.

[0166] Optionally, the frequency domain resources occupied by the first PBCH include frequency domain resources occupied by a synchronization signal.

[0167] Optionally, the frequency domain resources occupied by the synchronization signal include frequency domain resources occupied by the second PBCH.

[0168] When the terminal device is a first type of terminal device, the terminal device receives a first PBCH from the network device. Optionally, the terminal device may also receive a second PBCH from the network device.

[0169] Alternatively, when the terminal device is a terminal device of the second type, the terminal device receives a second PBCH from the network device.

[0170] Exemplarily, the first type of terminal device in the embodiment of the present application may be a broadband terminal device, and the second type of terminal device in the embodiment of the present application may be a narrowband terminal device.

[0171] In combination with the above description of the synchronization signal and the first PBCH, in a possible implementation, Figure 4A flowchart of a method for transmitting a synchronization signal and a PBCH provided in an embodiment of the present application is shown, comprising the following steps:

[0172] Step S401: A network device determines a synchronization signal including multiple subsequences.

[0173] The relevant description of step S401 can refer to the above step S301, which will not be repeated here.

[0174] Step S402: The network device sends a synchronization signal and a first PBCH to the terminal device. Accordingly, when the terminal device is a terminal device of the first type, the terminal device receives the synchronization signal and the first PBCH from the network device.

[0175] Specifically, the terminal device may receive the system information contained in the first PBCH to facilitate subsequent signal processing.

[0176] Step S403: The terminal device performs downlink synchronization according to the synchronization signal.

[0177] Optionally, the network device may send the second PBCH to the terminal device. In the case where the terminal device is a terminal device of the first type, the terminal device may receive and parse the second PBCH, or the terminal device may not receive the second PBCH, which is not limited in this application.

[0178] In combination with the above description of the synchronization signal and the second PBCH, in another possible implementation, Figure 5 A flowchart of another method for transmitting a synchronization signal and a PBCH provided in an embodiment of the present application is shown, comprising the following steps:

[0179] Step S501: A network device determines a synchronization signal including multiple subsequences.

[0180] The relevant description of step S501 can refer to the above step S301, which will not be repeated here.

[0181] Step S502: The network device sends a synchronization signal to the terminal device.

[0182] Optionally, the network device may also send the first PBCH to the terminal device. In the case where the terminal device is a second type of terminal device, since the bandwidth of the first PBCH usually exceeds the receiving bandwidth of the terminal device, the terminal device may not receive the first PBCH.

[0183] Step S503: When the terminal device is a terminal device of the second type, the terminal device receives one or more subsequences in a synchronization signal from the network device.

[0184] Step S504: When the terminal device is a terminal device of the second type, the terminal device performs downlink synchronization according to one or more subsequences in the synchronization signal.

[0185] Step S505: The network device sends a second PBCH to the terminal device. Accordingly, when the terminal device is a terminal device of the second type, the terminal device receives the second PBCH from the network device.

[0186] Specifically, the terminal device may receive the system information contained in the second PBCH to facilitate subsequent signal processing.

[0187] Optionally, step S504 may be performed first and then step S505, or step S505 may be performed first and then step S504, or step S504 and step S505 may be performed simultaneously, which is not limited in any way in the embodiments of the present application.

[0188] Optionally, the synchronization signal includes indication information, and the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH. In this scheme, the synchronization signal may include indication information for indicating the scheduling information of the second PBCH. In an embodiment of the present application, the time-frequency resource position of the second PBCH may be flexible, and the synchronization signal may carry more information. Specifically, the time-frequency resource position occupied by the second PBCH may have multiple candidate positions, and the specific position may be indicated by the synchronization signal.

[0189] Optionally, the synchronization signal includes a beam index, and the beam index is used by the terminal device to send data and / or signaling to the network device on the beam corresponding to the beam index. This solution can be applied to non-initial access of the terminal device, for example, the terminal device requests access to the network device again after the sleep ends. In this case, the terminal device does not need to receive the PBCH, and can directly send data and / or signaling to the network device on the beam corresponding to the beam index, thereby achieving a technical effect of energy saving.

[0190] Taking PSS and SSS with the same sequence structure design as an example, Figure 6 A schematic diagram of a synchronization signal and PBCH is shown, wherein 1, 2, ..., K represent the numbers of the subsequences. Figure 6 In the , the long sequence included in the PSS and SSS can be equally divided into K subsequences. Assume that for PSS and SSS, K = N = 11, N represents the length of each subsequence. The 11 subsequences included in the PSS or SSS can be mapped to multiple consecutive subcarriers of OFDM. Alternatively, assume that for PSS and SSS, K = 3, N = 31; or, assume that for PSS and SSS, K = 3, N = 41; or, assume that for PSS and SSS, K = 3, N = 43.

[0191] The frequency domain range occupied by the broadband PBCH is larger than the frequency domain range occupied by the PSS or SSS. Conversely, the frequency domain range occupied by the narrowband PBCH is smaller than the frequency domain range occupied by the PSS or SSS. The first time interval may be the difference between the minimum value in the time domain range occupied by the broadband PBCH and the maximum value in the time domain range occupied by the PSS. The second time interval may be the difference between the minimum value in the time domain range occupied by the narrowband PBCH and the maximum value in the time domain range occupied by the broadband PBCH.

[0192] Network equipment can send PSS, SSS, wideband PBCH and narrowband PBCH. Wideband terminal equipment can receive wideband PBCH, all PSS subsequences, and all SSS subsequences. Narrowband terminal equipment can receive narrowband PBCH, and part of PSS and SSS, that is, one or M subsequences of PSS and SSS, where M is a positive integer less than 11.

[0193] As an example, Figure 6 Only the case where multiple PSS or SSS subsequences are continuous in the frequency domain is shown. In practice, multiple PSS or SSS subsequences may also be spaced apart in the frequency domain, and the present application embodiment does not impose any limitation on this.

[0194] As an example, Figure 6 Only the case where the frequency domain resources occupied by the broadband PBCH include the frequency domain resources occupied by the PSS or SSS is shown. In practice, the bandwidth occupied by the broadband PBCH is wider than or equal to the bandwidth occupied by the PSS or SSS. The embodiment of the present application does not impose any limitation on the frequency position relationship between the broadband PBCH and the synchronization signal. Similarly, Figure 6 Only the case where the frequency domain resources occupied by the PSS or SSS include the frequency domain resources occupied by the second PBCH is shown. In practice, the bandwidth occupied by the PSS or SSS is wider than or equal to the bandwidth occupied by the narrowband PBCH. The embodiment of the present application does not impose any limitation on the frequency position relationship between the synchronization signal and the narrowband PBCH.

[0195] Taking PSS and SSS with different sequence structure designs as an example, Figure 7 FIG. 1 shows another schematic diagram of a synchronization signal and a PBCH, wherein 1, 2, ..., K represent subsequence numbers. Figure 7 In the example, it is assumed that for PSS, K = N = 11, and Figure 6The sequence structure design of PSS is exactly the same; or, K=3, N=31, 41 or 43. For SSS, K=3, N=31, 41 or 43. PSS includes 11 subsequences that can be mapped to multiple consecutive subcarriers of OFDM. The 3 subsequences included in SSS can be mapped to multiple consecutive OFDM symbols, and each subsequence included in SSS can be mapped to multiple consecutive subcarriers of OFDM. The frequency domain range occupied by broadband PBCH is larger than the frequency domain range occupied by PSS or SSS. Conversely, the frequency domain range occupied by narrowband PBCH is smaller than the frequency domain range occupied by PSS or SSS. The first time interval can be the difference between the minimum value in the time domain range occupied by broadband PBCH and the maximum value in the time domain range occupied by PSS. SSS may include indication information for indicating scheduling information of narrowband PBCH.

[0196] Network equipment can send PSS, SSS, wideband PBCH and narrowband PBCH. Wideband terminal equipment can receive wideband PBCH, all SSS subsequences, and all PSS subsequences. Narrowband terminal equipment can receive narrowband PBCH, SSS and part of PSS, that is, one or M subsequences of PSS, where M is a positive integer less than 11.

[0197] As an example, Figure 7 Only the case where multiple PSS subsequences are continuous in the frequency domain and multiple SSS subsequences are continuous in the time domain is shown. In practice, there may be gaps between multiple PSS subsequences in the frequency domain, and / or there may be gaps between multiple SSS subsequences in the time domain, and the embodiments of the present application do not impose any limitation on this.

[0198] It can be understood that in the above embodiments, the methods and / or steps implemented by the network device can also be implemented by components (such as chips or circuits) that can be used for the network device or by an apparatus including the network device; the methods and / or steps implemented by the terminal device can also be implemented by components (such as chips or circuits) that can be used for the terminal device or by an apparatus including the terminal device.

[0199] It is understandable that, in order to realize the above functions, the network device or terminal device includes a hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, 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 the form of hardware or computer software driving hardware 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.

[0200] The embodiment of the present application can divide the functional modules of the network device or terminal device according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0201] For example, the network device in the embodiment of the present application can adopt Figure 8 The communication device 800 shown in the figure is implemented. The communication device 800 may include a synchronization signal determination module 801 and a transceiver module 802. The communication device 800 is used to implement the above Figures 3 to 7 The functions of the terminal device in the method embodiment are shown.

[0202] For example, when the communication device 800 is used to implement Figure 3 The functions of the network device in the method embodiment shown are: a synchronization signal determination module 801, used to determine a synchronization signal including multiple subsequences; and a transceiver module 802, used to send a synchronization signal to a terminal device.

[0203] For a more detailed description of the synchronization signal determination module 801 and the transceiver module 802, please refer to Figures 3 to 7 The method embodiment shown is described in detail.

[0204] For another example, the terminal device in the embodiment of the present application may adopt Fig. 9 The communication device 900 shown in the figure is implemented. The communication device 900 may include a transceiver module 901 and a synchronization module 902. The communication device 900 is used to implement the above Figures 3 to 7 The functions of the terminal device in the method embodiment are shown.

[0205] Exemplarily, when the terminal device is a first type of terminal device, the transceiver module 901 is used to receive a synchronization signal; the synchronization module 902 is used to perform downlink synchronization according to the synchronization signal; or, when the terminal device is a second type of terminal device, the transceiver module 901 is used to receive one or more subsequences in the synchronization signal; the synchronization module 902 is used to perform downlink synchronization according to one or more subsequences in the synchronization signal.

[0206] For more detailed description of the above-mentioned transceiver module 901 and synchronization module 902, please refer to Figures 3 to 7 The method embodiment shown is described in detail.

[0207] In this embodiment, the communication device 800 or the communication device 900 is presented in the form of dividing each functional module in an integrated manner. The "module" here may refer to a specific ASIC, a circuit, a processor and a memory that executes one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above functions.

[0208] In a simple embodiment, those skilled in the art will appreciate that the communication device 900 may be used Figure 2 The form of the communication device 20 is shown.

[0209] for example, Figure 2 The processor 201 and / or the processor 207 in the communication device 20 shown can call the computer-executable instructions stored in the memory 203, so that the communication device 20 executes the synchronization signal transmission method in the above method embodiment. Specifically, Figure 8 Part of the functions / implementation process of the synchronization signal determination module 801 in can be Figure 2 The processor 201 and / or the processor 207 in the communication device 20 shown calls the computer execution instructions stored in the memory 203 to implement; Figure 8 Part of the functions / implementation process of the transceiver module 802 in the embodiment can be achieved by Figure 2 This is achieved by using a communication module connected to the communication interface 204 in the embodiment.

[0210] In a simple embodiment, those skilled in the art will appreciate that the communication device 900 may be used Figure 2 The form of the communication device 20 is shown.

[0211] for example, Figure 2 The processor 201 and / or the processor 207 in the communication device 20 shown can call the computer-executable instructions stored in the memory 203, so that the communication device 20 executes the synchronization signal transmission method in the above method embodiment. Specifically, Fig. 9 Part of the functions / implementation process of the transceiver module 901 in the embodiment can be achieved by Figure 2 This is achieved by using a communication module connected to the communication interface 204 in the embodiment. Fig. 9 Part of the functions / implementation process of the synchronization module 902 in can be achieved by Figure 2 The processor 201 and / or the processor 207 in the communication device 20 shown call the computer execution instructions stored in the memory 203 to implement.

[0212] Since the communication device 800 and the communication device 900 provided in this embodiment can execute the above-mentioned method for transmitting the synchronization signal, the technical effects that can be obtained can refer to the above-mentioned method embodiments and will not be repeated here.

[0213] It should be noted that one or more of the above modules or units can be implemented by software, hardware or a combination of the two. When any of the above modules or units is implemented by software, the software exists in the form of computer program instructions and is stored in a memory, and a processor can be used to execute the program instructions and implement the above method flow. The processor can be built into an SoC (system on chip) or an ASIC, or it can be an independent semiconductor chip. In addition to the core used to execute software instructions for calculation or processing within the processor, it can also further include necessary hardware accelerators, such as field programmable gate arrays (FPGA), PLDs (programmable logic devices), or logic circuits that implement dedicated logic operations.

[0214] When the above modules or units are implemented in hardware, the hardware can be any one or any combination of a CPU, a microprocessor, a digital signal processing (DSP) chip, a microcontroller unit (MCU), an artificial intelligence processor, an ASIC, a SoC, an FPGA, a PLD, a dedicated digital circuit, a hardware accelerator or a non-integrated discrete device, which can run the necessary software or not rely on the software to execute the above method flow.

[0215] Optionally, an embodiment of the present application further provides a chip system, including: at least one processor and an interface, the at least one processor is coupled to a memory through the interface, and when the at least one processor executes a computer program or instruction in the memory, the method in any of the above method embodiments is executed. In one possible implementation, the communication device also includes a memory. Optionally, the chip system can be composed of chips, or can include chips and other discrete devices, which is not specifically limited in the embodiments of the present application.

[0216] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or may contain one or more servers, data centers and other data storage devices that can be integrated with the medium. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0217] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other variations of the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "one" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in a claim. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0218] Although the present application has been described in conjunction with specific features and embodiments thereof, it is obvious that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for transmitting a synchronization signal, characterized in that: include: Determine a synchronization signal including a plurality of subsequences, each of the plurality of subsequences being mapped to a subcarrier of orthogonal frequency division multiplexing (OFDM), and a bandwidth of the synchronization signal being greater than or equal to a bandwidth of any subsequence of the plurality of subsequences; The synchronization signal is sent to the terminal device, and the synchronization signal is used by the terminal device to perform downlink synchronization.

2. The method according to claim 1, characterized in that The number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal.

3. The method according to claim 1 or 2, characterized in that: The subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

4. The method according to claim 1 or 2, characterized in that: The first subsequence included in the synchronization signal is a multi-phase sequence; the general term of the first subsequence satisfies the following formula: Among them, a, b, c, d, p, q are constants; n=1, 2, ..., N, N represents the length of the first subsequence, and N is a positive integer; k=1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, and K is a positive integer.

5. The method according to any one of claims 1 to 4, characterized in that: The synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

6. The method according to claim 5, characterized in that The number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same.

7. The method according to claim 5 or 6, characterized in that: Each subsequence included in the PSS or the SSS occupies the same time domain resources.

8. The method according to claim 5 or 6, characterized in that: Each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources.

9. The method according to any one of claims 1 to 8, characterized in that: The method further comprises: A first physical broadcast channel PBCH is sent; wherein a bandwidth occupied by the first PBCH is wider than or equal to a bandwidth occupied by the synchronization signal.

10. The method according to claim 9, characterized in that The frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

11. The method according to any one of claims 1 to 10, characterized in that: The method further comprises: Sending a second PBCH; wherein a bandwidth occupied by the first PBCH is wider than a bandwidth occupied by the second PBCH.

12. The method according to claim 11, characterized in that The frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

13. The method according to claim 11 or 12, characterized in that: The synchronization signal includes indication information, and the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH.

14. The method according to any one of claims 1 to 13, characterized in that: The synchronization signal includes a beam index, and the beam index is used by the terminal device to send data and / or signaling on the beam corresponding to the beam index.

15. A method for transmitting a synchronization signal, characterized in that: Applied to terminal equipment, including: In the case where the terminal device is a terminal device of the first type, receiving a synchronization signal, the synchronization signal comprising a plurality of subsequences, each of the plurality of subsequences being mapped to a subcarrier of orthogonal frequency division multiplexing OFDM, and a bandwidth of the synchronization signal being greater than or equal to a bandwidth of any subsequence of the plurality of subsequences; performing downlink synchronization according to the synchronization signal; or, In the case where the terminal device is a terminal device of the second type, receiving one or more subsequences in the synchronization signal; performing downlink synchronization according to the one or more subsequences in the synchronization signal; The bandwidth of the signal received by the first type of terminal device is wider than the bandwidth of the signal received by the second type of terminal device.

16. The method according to claim 15, characterized in that The number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal.

17. The method according to claim 15 or 16, characterized in that The subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

18. The method according to claim 15 or 16, characterized in that The first subsequence included in the synchronization signal is a multi-phase sequence; the general term of the first subsequence satisfies the following formula: Among them, a, b, c, d, p, q are constants; n=1, 2, ..., N, N represents the length of the first subsequence, and N is a positive integer; k=1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, and K is a positive integer.

19. The method according to any one of claims 15 to 18, characterized in that: The synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

20. The method according to claim 19, characterized in that The number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same.

21. The method according to claim 19 or 20, characterized in that Each subsequence included in the PSS or the SSS occupies the same time domain resources.

22. The method according to claim 19 or 20, characterized in that Each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources.

23. The method according to any one of claims 15 to 22, characterized in that: The terminal device is a terminal device of the first type; the method further includes: receiving a first PBCH; wherein a bandwidth occupied by the first PBCH is wider than or equal to a bandwidth occupied by the synchronization signal.

24. The method according to claim 23, characterized in that The frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

25. The method according to any one of claims 15 to 22, characterized in that: The terminal device is the second type of terminal device; the method further includes: receiving a second PBCH; wherein a bandwidth occupied by the first PBCH is wider than a bandwidth occupied by the second PBCH.

26. The method according to claim 25, characterized in that The frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

27. The method according to claim 25 or 26, characterized in that The synchronization signal includes indication information, and the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH.

28. The method according to any one of claims 15 to 27, characterized in that: The synchronization signal includes a beam index, and the beam index is used by the terminal device to send data and / or signaling on the beam corresponding to the beam index.

29. A communication device, characterized in that: include: A memory and a processor coupled to the memory, the memory being used to store a program, and the processor being used to execute the program stored in the memory; when the communication device is running, the processor runs the program so that the communication device executes the method described in any one of claims 1 to 14 above; or, the communication device executes the method described in any one of claims 15 to 28 above.

30. A communication system, characterized in that: The communication system includes a network device and a terminal device; wherein the network device is used to execute the method according to any one of claims 1-14, and the terminal device is used to execute the method according to any one of claims 15-28.

31. A computer-readable storage medium, characterized in that: A computer program is stored thereon, which, when executed by a computer, enables the computer to execute the method described in any one of claims 1 to 14; or, when executed by a computer, enables the computer to execute the method described in any one of claims 15 to 28.

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