SSB transmission method and communication device

Abstract

Provided are an SSB transmission method and a communication device, which can be applied to a non-terrestrial network (NTN) communication scenario, in the method, a DMRS sequence of a PBCH in an SSB, which is repeatedly transmitted in a coverage enhancement mode, is redesigned, so that a terminal device can identify a repeated identifier of the SSB by demodulating the DMRS sequence of the PBCH in the SSB. Through the mode, the problem that the frame boundary and the time slot boundary of the cell are difficult to accurately identify due to the fact that the terminal equipment cannot identify the repeated identifier of the SSB in a coverage enhancement mode of repeatedly transmitting the SSB can be avoided, the communication performance is favorably improved, and the reliability of synchronous communication between the terminal equipment and the network equipment is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular, to a SSB transmission method and a communication device. Background Art

[0002] In the scenario where non-terrestrial network (NTN) communication and fifth generation (5G) mobile communication are integrated, the distance between the terminal device and the network device is far, resulting in a large wireless signal transmission delay and more transmission path loss. In this case, it is necessary to enhance the coverage performance of the network device. Among them, one way to enhance the coverage performance is to repeatedly transmit data. For example, in the cell search phase of initial synchronization, the network device repeatedly transmits the synchronization signal block (SSB), and the terminal device performs combined detection on the SSB repeatedly transmitted by the network device, which can help improve the channel estimation performance of the downlink channel, thereby achieving the effect of enhancing coverage performance. However, in this coverage enhancement scenario, it is difficult for the terminal device to identify the repeatedly transmitted SSB, which leads to the inability to accurately identify the frame boundary and time slot boundary of the cell, affecting the synchronous communication between the terminal device and the network device. Therefore, in the coverage enhancement scenario, how to transmit SSB to enable the terminal device to accurately identify the frame boundary and time slot boundary of the cell is an urgent problem to be solved. Summary of the invention

[0003] The embodiments of the present application provide an SSB transmission method and a communication device, which can enable a terminal device to identify the repeated identification of SSB in a coverage enhancement scenario of SSB repeated transmission, and then accurately identify the frame boundary and time slot boundary of the cell, which is beneficial to improving communication performance and improving the reliability of synchronous communication between the terminal device and the network device.

[0004] In a first aspect, an embodiment of the present application provides an SSB transmission method, which can be executed by a terminal device, or can also be executed by a chip in the terminal device, the method comprising: in response to the current communication mode being a coverage enhancement mode, receiving a first SSB from a network device; the coverage enhancement mode is a mode of repeatedly transmitting SSB; determining a first sequence parameter according to a DMRS sequence of PBCH in the first SSB; determining a repetition identifier of the first SSB according to the first sequence parameter; the first sequence parameter and the repetition identifier of the first SSB have a mapping relationship, and the repetition identifier of the first SSB is used to indicate the repetition count index of the first SSB; the repetition identifier of the first SSB is used to determine the frame boundary and time slot boundary of the repeatedly transmitted SSB.

[0005] In the present application, the first sequence parameter used to generate the DMRS sequence of the PBCH in the first SSB can have a mapping relationship with the repetition identifier of the first SSB, and the mapping relationship can be predefined by the protocol or configured by the network device, so that the terminal device can obtain the first sequence parameter by demodulating the DMRS sequence of the PBCH in the first SSB, and then determine the repetition identifier of the first SSB. In this way, the terminal device can accurately identify the frame boundary and time slot boundary of the cell in the coverage enhancement mode of repeated transmission of SSB, which is conducive to improving communication performance.

[0006] In combination with the first aspect, in a possible implementation, the determining of the first sequence parameters according to the DMRS sequence of the PBCH in the first SSB includes: blindly detecting the DMRS sequence of the PBCH in the first SSB according to the candidate sequence parameters; and determining the first sequence parameters from the candidate sequence parameters according to the blind detection result. It can be seen that determining the first sequence parameters from the candidate sequence parameters is conducive to improving the flexibility of blind detection.

[0007] In combination with the first aspect, in a possible implementation, the method further includes: receiving a first message from a network device; the first message includes a candidate sequence parameter. It can be seen that the candidate sequence parameter can be configured by the network device to facilitate flexible management of the candidate sequence parameter.

[0008] In combination with the first aspect, in a possible implementation, the first message also includes a mapping relationship between the first sequence parameter and the repetition identifier of the first SSB. It can be seen that the mapping relationship between the first sequence parameter and the repetition identifier of the first SSB can also be configured by the network device to flexibly manage the mapping relationship between the first sequence parameter and the repetition identifier of the first SSB.

[0009] In combination with the first aspect, in a possible implementation manner, the first message is a SIB message, or the first message is an RRC message, or the first message is an RRC release message, or the first message is a DCI message, or the first message is a MACCE message.

[0010] In combination with the first aspect, in a possible implementation, the mapping relationship between the first sequence parameter and the repetition identifier of the first SSB is predefined by the protocol.

[0011] In combination with the first aspect, in a possible implementation, the method further includes: receiving a second message from a network device; the second message includes candidate coding information; determining candidate sequence parameters according to the candidate coding information; the candidate coding information and the candidate sequence parameters have a mapping relationship. It can be seen that the candidate sequence parameters can be determined more reliably through the candidate coding information.

[0012] In combination with the first aspect, in a possible implementation manner, the second message is an RRC message, or the second message is an RRC release message, or the second message is a DCI message, or the second message is a MAC CE message.

[0013] In combination with the first aspect, in a possible implementation, the first sequence parameter also has a mapping relationship with the index of the first SSB; the method further includes: determining the index of the first SSB according to the first sequence parameter; obtaining the second SSB; the index of the second SSB is the same as the index of the first SSB; merging the first SSB and the second SSB. It can be seen that merging the SSBs with the same index is conducive to improving the decoding performance of repeated SSB transmission.

[0014] In combination with the first aspect, in a possible implementation, the first message also includes a mapping relationship between the first sequence parameter and the index of the first SSB. It can be seen that the mapping relationship between the first sequence parameter and the index of the first SSB can also be configured by the network device to flexibly manage the mapping relationship between the first sequence parameter and the index of the first SSB.

[0015] In combination with the first aspect, in a possible implementation, the method further includes: obtaining a pattern corresponding to the coverage enhancement mode; the pattern is used to indicate the time domain position of the repeated transmission of the SSB; and determining the time domain position of the transmission of the first SSB according to the pattern, the repetition identifier of the first SSB, and the index of the first SSB. It can be seen that with the help of the pattern corresponding to the coverage enhancement mode, the time domain position of the first SSB can be determined more efficiently.

[0016] In combination with the first aspect, in a possible implementation, the obtaining of the pattern corresponding to the coverage enhancement mode includes: obtaining the pattern corresponding to the coverage enhancement mode from the payload of the PBCH in the first SSB. It can be seen that configuring the pattern corresponding to the coverage enhancement mode through the payload of the PBCH is conducive to more conveniently obtaining the pattern corresponding to the coverage enhancement mode.

[0017] In combination with the first aspect, in a possible implementation manner, the pattern corresponding to the coverage enhancement mode may be predefined by a protocol, which is helpful in saving bit overhead.

[0018] In combination with the first aspect, in a possible implementation, the method further includes: the method further includes: in response to the current communication frequency band belonging to the first frequency band range, determining that the current communication mode is the coverage enhancement mode. It can be seen that whether the current communication mode is the coverage enhancement mode can be quickly determined based on the communication frequency band.

[0019] In combination with the first aspect, in a possible implementation, the method further includes: in response to the acquired physical cell identifier belonging to the first identifier range, determining that the current communication mode is the coverage enhancement mode. It can be seen that whether the current communication mode is the coverage enhancement mode can be conveniently determined based on the physical cell identifier.

[0020] In combination with the first aspect, in a possible implementation, the method further includes: in response to failure of blind detection of the DMRS sequence of the PBCH in the first SSB according to the reference sequence parameters, determining that the current communication mode is the coverage enhancement mode; the reference sequence parameters are predefined by the protocol. It can be seen that by blindly detecting the DMRS sequence of the PBCH in the first SSB according to the reference sequence parameters predefined by the protocol, it is possible to more accurately identify whether the current communication mode is the coverage enhancement mode.

[0021] In a second aspect, an embodiment of the present application provides another SSB transmission method, which can be executed by a network device, or can also be executed by a chip in the network device, and the method includes: in response to the current communication mode being a coverage enhancement mode, determining the DMRS sequence of the PBCH in the first SSB according to a first sequence parameter; the coverage enhancement mode is a mode of repeatedly transmitting SSB, the first sequence parameter has a mapping relationship with the repetition identifier of the first SSB, and the repetition identifier of the first SSB is used to indicate the repetition count index of the first SSB; sending the first SSB to the terminal device.

[0022] In the present application, the first sequence parameter used to generate the DMRS sequence of the PBCH in the first SSB may have a mapping relationship with the repetition identifier of the first SSB, and the mapping relationship may be predefined by the protocol or configured by the network device. The network device may send the first SSB to the terminal device, so that the terminal device may obtain the first sequence parameter by demodulating the DMRS sequence of the PBCH in the first SSB, and then determine the repetition identifier of the first SSB. In this way, the terminal device can accurately identify the frame boundary and time slot boundary of the cell in the coverage enhancement mode of repeatedly transmitting the SSB, which is beneficial to improving communication performance.

[0023] In conjunction with the second aspect, in a possible implementation, the first sequence parameter is a candidate sequence parameter among the candidate sequence parameters predefined by the protocol. It can be seen that the first sequence parameter can be a candidate sequence parameter predefined by the protocol, so as to more directly determine the DMRS sequence of the PBCH in the first SSB.

[0024] In combination with the second aspect, in a possible implementation, the method further includes: determining a first sequence parameter according to a repetition identifier of the first SSB; the first sequence parameter has a mapping relationship with the repetition identifier of the first SSB. It can be seen that the first sequence parameter is determined based on the repetition identifier of the first SSB, so that SSBs with different repetition identifiers can be distinguished through the first sequence parameter.

[0025] In conjunction with the second aspect, in a possible implementation, the method further includes: sending a first message to a terminal device, the first message including a candidate sequence parameter; the candidate sequence parameter including a first sequence parameter. It can be seen that the candidate sequence parameter can be configured by the network device to facilitate flexible management of the candidate sequence parameter.

[0026] In combination with the second aspect, in a possible implementation, the first message also includes a mapping relationship between the first sequence parameter and the repetition identifier of the first SSB. It can be seen that the mapping relationship between the first sequence parameter and the repetition identifier of the first SSB can also be configured by the network device to flexibly manage the mapping relationship between the first sequence parameter and the repetition identifier of the first SSB.

[0027] In combination with the second aspect, in a possible implementation manner, the first message is a SIB message, or the first message is an RRC message, or the first message is an RRC release message, or the first message is a DCI message, or the first message is a MACCE message.

[0028] In conjunction with the second aspect, in a possible implementation, a second message is sent to a terminal device; the second message includes candidate coding information, the candidate coding information has a mapping relationship with candidate sequence parameters, and the candidate sequence parameters include first sequence parameters. It can be seen that the candidate coding information can be configured by the network device to facilitate more flexible determination of the candidate sequence parameters.

[0029] In combination with the second aspect, in a possible implementation manner, the second message is a SIB message, or the second message is an RRC message, or the second message is an RRC release message, or the second message is a DCI message, or the second message is a MACCE message.

[0030] In combination with the second aspect, in a possible implementation, the first sequence parameter also has a mapping relationship with the index of the first SSB. It can be seen that the first sequence parameter has a mapping relationship with the index of the first SSB, so that the index of the first SSB can be quickly obtained according to the first sequence parameter.

[0031] In combination with the second aspect, in a possible implementation, the first message also includes a mapping relationship between the first sequence parameter and the index of the first SSB. It can be seen that the mapping relationship between the first sequence parameter and the index of the first SSB can also be configured by the network device to flexibly manage the mapping relationship between the first sequence parameter and the index of the first SSB.

[0032] In combination with the second aspect, in a possible implementation, the mapping relationship between the first sequence parameter and the index of the first SSB is predefined by the protocol.

[0033] In conjunction with the second aspect, in a possible implementation, a pattern corresponding to the coverage enhancement mode is determined; the pattern is used to indicate the time domain position of the repeated transmission SSB. It can be seen that with the help of the pattern corresponding to the coverage enhancement mode, the time domain position of the repeated transmission SSB can be indicated more intuitively.

[0034] In conjunction with the second aspect, in a possible implementation, the above-mentioned determination of the pattern corresponding to the coverage enhancement mode includes: determining the pattern corresponding to the coverage enhancement mode according to the current communication frequency band and the subcarrier spacing. It can be seen that the pattern corresponding to the coverage enhancement mode can be determined more efficiently through the communication frequency band and the subcarrier spacing.

[0035] In conjunction with the second aspect, in a possible implementation, the method further includes: in response to the current communication frequency band belonging to the first frequency band range, determining that the current communication mode is the coverage enhancement mode. It can be seen that whether the current communication mode is the coverage enhancement mode can be quickly determined based on the communication frequency band.

[0036] In combination with the second aspect, in a possible implementation, the method further includes: in response to the central beam elevation angle of the satellite beam of the current communication being less than or equal to the first threshold, determining that the current communication mode is the coverage enhancement mode. It can be seen that the central beam elevation angle of the satellite beam of the current communication can effectively determine whether the current communication mode is the coverage enhancement mode.

[0037] In conjunction with the second aspect, in a possible implementation, the method further includes: in response to sending a first signal to a first number of terminal devices, determining that the current communication mode is a coverage enhancement mode; the first number is greater than or equal to a second threshold, and the first signal is used to indicate that the current communication quality is poor. It can be seen that whether the current communication mode is a coverage enhancement mode can be flexibly determined based on the communication quality of the current area.

[0038] In conjunction with the second aspect, in a possible implementation, the method further includes: in response to the physical cell identifier of the terminal device belonging to the first identifier range, determining that the current communication mode is the coverage enhancement mode. It can be seen that whether the current communication mode is the coverage enhancement mode can be conveniently determined based on the physical cell identifier.

[0039] In a third aspect, an embodiment of the present application provides a communication device, which may be a terminal device, or a device in a terminal device, or a device that can be used in combination with a terminal device. Among them, the communication device may also be a chip system. The communication device may execute the method described in the first aspect. The functions of the communication device may be implemented by hardware, or by hardware executing corresponding software implementations. The hardware or software includes one or more units or modules corresponding to the above functions. The unit or module may be software and / or hardware. The operations and beneficial effects performed by the communication device may refer to the method and beneficial effects described in the first aspect above.

[0040] In a fourth aspect, an embodiment of the present application provides a communication device, which may be a network device, or a device in a network device, or a device that can be used in combination with a network device. The communication device may also be a chip system. The communication device may execute the method described in the second aspect. The functions of the communication device may be implemented by hardware, or by hardware executing corresponding software implementations. The hardware or software includes one or more units or modules corresponding to the above functions. The unit or module may be software and / or hardware. The operations and beneficial effects performed by the communication device may refer to the method and beneficial effects described in the second aspect above.

[0041] In a fifth aspect, an embodiment of the present application provides a communication device, the communication device including a processor, the processor being used to execute the method as described in the first aspect or the method as described in the second aspect.

[0042] In a sixth aspect, an embodiment of the present application provides a communication device, comprising a processor, the processor being coupled to a memory, the memory being used to store programs or instructions, and when the programs or instructions are executed by the processor, the communication device executes the method described in the first aspect or the second aspect.

[0043] In a possible implementation, the communication device further includes a memory. Optionally, the processor and the memory are integrated together. Optionally, the memory and the processor are independently configured.

[0044] In the seventh aspect, an embodiment of the present application provides a communication device, which includes a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device, and the processor is used to implement the method described in the first aspect or the second aspect through a logic circuit or executing code instructions.

[0045] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, in which a computer program or instructions are stored. When the computer program or instructions are executed by a communication device, the method described in the first aspect or the second aspect is implemented.

[0046] In a ninth aspect, an embodiment of the present application provides a computer program product comprising instructions, and when a communication device reads and executes the instructions, the communication device executes a method as described in any one of the first aspect or the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1A is a schematic diagram of an SSB pattern provided in an embodiment of the present application;

[0048] Figure 1B It is a comparative schematic diagram of PSS detection performance in a NTN-TDL-C channel scenario provided in an embodiment of the present application;

[0049] Figure 1C is a schematic diagram of transmitting an SS burst provided in an embodiment of the present application;

[0050] Figure 2 is a schematic diagram of the system architecture of a communication system applied to an embodiment of the present application;

[0051] Figure 3A-3C is a schematic diagram of the architecture of the NTN network applied to the embodiment of the present application;

[0052] Figure 4 It is a flowchart of an SSB transmission method provided in an embodiment of the present application;

[0053] Figure 5 is a schematic diagram of a pattern corresponding to a coverage enhancement mode provided in an embodiment of the present application;

[0054] Figure 6 is a schematic diagram of a pattern corresponding to another coverage enhancement mode provided in an embodiment of the present application;

[0055] Figure 7 It is a flowchart of another SSB transmission method provided in an embodiment of the present application;

[0056] Figure 8 is a structural diagram of a communication device provided in an embodiment of the present application;

[0057] Fig. 9 It is a structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] Before describing the embodiments of the present application, a brief explanation of the relevant concepts involved in the embodiments of the application is given.

[0059] 1. Non-terrestrial network (NTN) communications

[0060] NTN communication can also be called satellite communication. Satellite communication can provide a wider coverage than terrestrial communication, and satellite base stations are not easily damaged by natural disasters or external forces. For example, the introduction of satellite communication in 5G communication can provide communication services for areas that cannot be covered by terrestrial communication networks, such as oceans and forests. It can also provide better communication services for users who take airplanes and trains, which is conducive to enhancing the reliability of communication, providing more data transmission resources for 5G communication, and improving the network speed. Therefore, supporting communication with the ground and satellite at the same time is an inevitable trend in future communications. It has great benefits in wide coverage, reliability, multiple connections, and high throughput. However, satellite communication has the characteristics of large round-trip transmission delay, and the terminal equipment will frequently switch beams and cells with the movement of the satellite. In order to realize the integration of satellite communication and 5G communication, it is necessary to enhance the coverage performance of network equipment.

[0061] 2. Synchronous Signal Block (SSB)

[0062] 1. SSB transmission

[0063] The network device can send multiple SSBs by time division multiplexing (TDM). For example, the network device can transmit multiple SSBs in the form of an SSB set (SS burst). Optionally, the network device can periodically transmit the SS burst with one or more radio frames as a period. In a radio frame, the SSB can be supported to be sent in the first 5ms (first half frame) or in the last 5ms (second half frame). One SSB in the SS burst can correspond to an SSB index. Optionally, the number of SSBs in an SS burst can be related to the subcarrier spacing used by the network device. In the new radio (NR) protocol, SSB supports 15kHz, 30kHz, 120kHz and 240kHz subcarrier spacing. For different subcarrier spacings, in an SS burst, the SSB pattern configured in the time domain of the SSB can be different. The network device can determine the SSB pattern based on the frequency band and subcarrier spacing used, and transmit the SSB according to the SSB pattern.

[0064] For example, Figure 1AAs shown, for a 15kHz subcarrier spacing and a frequency band below 3GHz, 4 SSBs can be transmitted in one SS burst (5ms). Among them, two SSBs can be distributed in a 1ms (one time slot) resource. One of the two SSBs, SSB1, can occupy orthogonal frequency division multiplexing (OFDM) symbol 2 to OFDM symbol 5, and the other SSB2 can occupy OFDM symbol 8 to OFDM symbol 11.

[0065] 2. SSB detection

[0066] When the terminal device needs to access the network (for example, after the terminal device is turned on, or when the terminal device needs to reconnect after being disconnected from the network device), the acquired SSB can be detected. The SSB includes the primary synchronization signal (PSS), the secondary synchronization signal (SSS) and the physical broadcast channel (PBCH). The synchronization grid of each frequency band of SSB is specified in the NR protocol, that is, the frequency points where the SSB center frequency may appear are determined, and one of the frequency points corresponds to a global synchronization channel number (GSCN). The synchronization grid can be determined based on the GSCN. The terminal device obtains the SSB broadcast by the network device in the cell and the SSB pattern used by the network device to send the SSB at the frequency point specified by the NR protocol. After the terminal device obtains the SSB, it can detect the SSB. Among them, SSB detection can include the following links: PSS and SSS detection, PBCH detection.

[0067] (1) PSS and SSS detection

[0068] By detecting PSS and SSS, the terminal device can obtain timing information and determine the cell identifier. Specifically, by detecting PSS, the terminal device can obtain NID2, and by detecting SSS, the terminal device can obtain NID1. Here, NID2 and NID1 can be understood as identifiers related to the cell identifier (such as physical cell identifier, PCI). 1008 physical cell identifiers are defined in the NR protocol, satisfying PCI=3NID1+NID2, and NID2∈{0, 1, 2}, NID1∈{0, 1, ..., 335}. The terminal device can determine the cell identifier PCI based on NID2 and NID1.

[0069] (2) PBCH detection

[0070] In the NR protocol, the time domain position and frequency domain position of SSB are flexible and variable. Only detecting PSS and SSS cannot obtain complete synchronization of frequency domain and time domain resources, and further detection of PBCH is required. Specifically, according to the cell identifier, the terminal device can obtain the PBCH DMRS position, and the position offset of PBCH DMRS is υ=mod(PCI,4). In addition, according to the NR protocol, PBCHDMRS uses m sequence, which is generated based on the scrambling sequence generator, namely Cinit, and its formula is as follows:

[0071]

[0072] Among them, Cinit can take up to 8 different values. It can take values ​​0, 1, 2, ..., 7. That is to say It can carry up to 3 bits of information.

[0073] The terminal device can determine the value of Cinit by blindly detecting the PBCH DMRS sequence, and then determine the value of Can be used to determine the SSB index.

[0074] It is worth noting that for different frequency bands, the maximum number of SSBs supported by a single SS burst, Lmax, is different. The value of Lmax is as follows:

[0075] ①FR1 band below 3GHz, Lmax=4.

[0076] In this case, Among them, i ssb Indicates SSB index, i ssb Corresponds to the lowest 2 bits of the SSB index. hf Represents half-frame indication information, which is used to indicate the half-frame identifier of the SSB in the wireless frame. 0 corresponds to the first half-frame and 1 corresponds to the second half-frame.

[0077] ②FR1 frequency band between 3GHz-6GHz, Lmax=8.

[0078] In this case, Among them, i ssb Corresponds to the lowest 3 bits of the SSB index.

[0079] ③FR2 frequency band, Lmax=64.

[0080] In this case, wherein, i ssb corresponds to the lowest 3 bits of the SSB index. Since when Lmax = 64, a total of 6 bits are required to indicate the SSB index. At this time, in addition to the 3 - bit information carried, an additional 3 - bit information is required. This additional 3 - bit information can be obtained from the PBCH payload. That is to say, the highest 3 bits of the SSB index can be demodulated from the PBCH payload.

[0081] In addition, since when Lmax = 8 / 64, does not contain half - frame indication information, the terminal device can also demodulate the half - frame indication information from the PBCH payload.

[0082] III. Coverage Enhancement Mode

[0083] The coverage enhancement mode (which can also be described as a coverage enhancement scenario) involved in the embodiments of the present application is mainly for enhancing the coverage of the downlink channel. Among them, one way to enhance the coverage of the downlink channel is to achieve it through repeated transmission of the SSB. The network device can repeatedly transmit the SSB to the terminal device, and the terminal device can perform combined detection on the repeatedly transmitted SSB to improve the detection performance of the PSS and the decoding performance of the PBCH channel, so as to achieve the effect of coverage enhancement.

[0084] Exemplarily, taking the NTN - TDL - C (a kind of NTN channel model) channel scenario as an example, Figure 1B shows a comparison schematic diagram of the detection performance of a PSS in the NTN - TDL - C channel scenario. Among them, the size of the signal - to - interference - plus - noise ratio (SNR) can be used to represent the quality of the PSS detection performance. The smaller the SNR, the better the PSS detection performance. As Figure 1B shown, the SNR corresponding to the SSB repeated transmission 4 times < the SNR corresponding to the SSB repeated transmission 3 times < the SNR corresponding to the SSB repeated transmission 2 times < the SNR corresponding to the SSB single transmission. That is to say, the PSS detection performance corresponding to the SSB repeated transmission 4 times is the best, and the PSS detection performance corresponding to the SSB single transmission is the worst. It can be Figure 1B seen that by the way of repeatedly transmitting the SSB and performing combined detection on the SSB, it is beneficial to improve the detection performance of the PSS.

[0085] In addition, according to the SNR and the carrier to noise power ratio (CNR), the SNR margin can be determined. The SNR margin can be determined by the difference between the CNR and the SNR. A positive SNR margin indicates that the current link can meet the decoding requirements and has a certain margin to resist unknown or sudden channel degradation. Taking the SSB single transmission scenario as an example, Table 1 shows the CNR under different satellite parameter set assumptions.

[0086] Table 1

[0087] Network device type Parameter set assumptions CNR LEO600 Set1 -1.3dB LEO600 Set2 -7.3dB LEO1200 Set1 -0.7dB LEO1200 Set2 -6.7dB

[0088] For the case of SSB single transmission, combined with Figure 1B As shown in Table 1, under the assumption of parameter set Set1, LEO600 and LEO1200 both have an SNR margin of about 3dB; under the assumption of parameter set Set2, LEO600 and LEO1200 have no SNR margin. It can be seen that it is necessary to enhance coverage performance through SSB repeated transmission.

[0089] Currently, in the coverage enhancement mode, the terminal device performs combined detection on the repeatedly transmitted SSB in the following two ways:

[0090] Method 1: SSB merging detection between multiple SS bursts

[0091] For method 1, the terminal device can combine and detect SSBs with the same SSB index in multiple different SS bursts. The combined detection includes PSS combined detection and PBCH combined detection (which can also be described as PBCH combined decoding). In this method, the terminal device needs to wait for multiple cycles to receive multiple SS bursts. Since NTN communication may use a longer SSB scanning cycle (such as 80ms, 160ms, etc.), this will increase the access delay of the terminal device. At the same time, performing SSB combined detection across multiple SS bursts will increase the impact of timing drift on the PSS combined detection in the SSB combined detection, so that the PSS combined detection fails, affecting the synchronous communication between the terminal device and the network device.

[0092] In addition, for the initial access terminal device, the detection window of the terminal device may not completely include all SSBs with the same SSB index. For example, for satellite beam 1, the network device can send 4 repeated SSBs with SSB index 1 within 40ms, while the detection window of the terminal device may only include the SSBs with SSB index 1 sent by the network device for the last 2 times. This may cause the terminal device to be unable to accurately identify the frame boundary and time slot boundary of the cell, affecting the synchronous communication between the terminal device and the network device. For example, Figure 1C As shown, the network device sends four SS bursts, namely SS burst 1, SS burst 2, SS burst 3 and SS burst 4. Each SS burst includes an SSB index 1. However, in the detection window 111, only SSB index 1 in SS burst 3 and SSB index 1 in SS burst 4 are included.

[0093] Method 2: Combined detection of multiple SSBs in one SS burst

[0094] For method 2, the terminal device can combine and detect multiple SSBs with different SSB indices in one SS burst. However, this method requires changing the mapping rules of Type0 PDCCH CSS set (search space set 0) so that multiple SSBs with different SSB indices can schedule the same system information block (SIB) 1. This method makes significant changes to the current NR protocol. In addition, this method will cause multiple satellite beams with different SSB indices to continuously scan the same ground position in NTN communications, and NTN communications currently have the problem of a huge number of positions but insufficient SSB indices. Therefore, method 2 is not suitable for NTN communication scenarios.

[0095] Based on this, an embodiment of the present application provides an SSB transmission method that can be applied to NTN communication scenarios. In the coverage enhancement scenario of SSB repeated transmission, it can enable the terminal device to identify the SSB repeated identifier, and then accurately identify the frame boundary and time slot boundary of the cell, which is conducive to improving communication performance.

[0096] The embodiments of the present application can be applied to various communication systems, such as: 5G or NR system, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, etc. The embodiments of the present application can also be applied to future communication systems, such as the sixth generation mobile communication system. The embodiments of the present application can also be applied to device to device (D2D) communication, vehicle to everything (V2X) communication, machine to machine (M2M) communication, machine type communication (MTC), and Internet of things (IoT) communication system or other communication systems.

[0097] The embodiments of the present application may also be applied to long-distance communication scenarios, such as satellite communication scenarios where the distance between a terminal device and a network device is constantly changing, or other long-distance communication scenarios, but the embodiments of the present application are not limited thereto.

[0098] See also Figure 2 , Figure 2 Schematic diagram of the system architecture of the communication system applied to the embodiment of the present application. Figure 2 As shown, it includes a network device 101 and a terminal device 102, and wireless communication can be performed between the network device 101 and the terminal device 102.

[0099] The network device 101 generally has a wireless transceiver function and a mobile feature. For example, the network device 101 may be a mobile device. Optionally, the network device 101 may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, or a high elliptical orbit (HEO) satellite. Of course, the network device 101 may also be a base station located on land, water, or the like. For example, the network device 101 may be a next generation NodeB (gNB) or a next generation-evolved NodeB (ng-eNB). Among them, gNB can provide the user plane function and control plane function of NR, and ng-eNB can provide the user plane function and control plane function of evolved universal terrestrial radio access (EUTRA). It should be noted that gNB and ng-eNB are only a name used to indicate a base station that supports the 5G network system and have no restrictive meaning. The network device 101 can also be a base station (base transceiver station, BTS) in a GSM system or a CDMA system, a base station (nodeB, NB) in a WCDMA system, or an evolved base station (evolutional node B, eNB or eNodeB) in an LTE system. Alternatively, the network device 101 can also be a relay station, an access point, a vehicle-mounted device, a wearable device, a network-side device in a network after 5G, or a network device in a future evolved PLMN network, a road site unit (road site unit, RSU), etc.

[0100] The terminal device 102 may be any terminal, for example, the terminal device 102 may be a user device for machine type communication. The terminal device 102 may also be referred to as user equipment (UE), mobile station (MS), mobile terminal, terminal, etc. The terminal device 102 may communicate with one or more core networks via the RAN, and therefore, the terminal device 102 may also be referred to as a wireless terminal, which may be a device that provides voice and / or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. For example, the terminal device 102 can be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device or a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. This embodiment of the present application is not specifically limited. Optionally, the terminal device 102 can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on the water surface; it can also be deployed on aircraft, balloons and artificial satellites in the air. The embodiments of the present application do not limit the application scenarios of the terminal device 102.

[0101] In some implementation scenarios, when the network device 101 is a satellite, the network formed between the network device 101 and the terminal device 102 may be referred to as an NTN network. Figure 2 In the architecture of the communication system shown, the satellite can have the function of a base station, and the satellite and the terminal device 102 can communicate directly.

[0102] For example, see Figure 3A-3C , Figure 3A-3C2 is a schematic diagram of the architecture of the NTN network applied to the embodiment of the present application. Among them, the terminal device 201 can access the network through an air interface (the air interface can be various types of air interfaces, such as a 5G air interface). The satellite 202 has some or all functions of the access network device, and can provide wireless access services and schedule wireless resources for the terminal devices that access the network through the satellite 202.

[0103] In some embodiments, Figure 3A As shown, the base station 203 can be deployed on the ground and connected to the satellite 202 through the ground station 204. The base station 203 and the ground station 204 can be connected to the core network 205 in a wired or wireless manner.

[0104] In some embodiments, Figure 3B As shown, the base station can be deployed on a satellite, which can be called a satellite base station 206. The satellite base station 206 can be connected to the ground station 204 through a next generation (NG) network interface.

[0105] In some embodiments, Figure 3C As shown, the base station 203 can be deployed with all or part of its functions on the satellite 202, and the satellite base station 206 and the satellite base station 207 can complete signaling interaction and user data transmission through the Xn interface (the interface between base stations).

[0106] The following is a detailed description of an SSB transmission method provided in an embodiment of the present application in conjunction with the accompanying drawings.

[0107] See also Figure 4 , Figure 4 A flow chart of a SSB transmission method provided in an embodiment of the present application, which can be performed by a terminal device and a network device, or can also be performed by a chip in a terminal device and a chip in a network device. The method includes but is not limited to the following steps:

[0108] S401, in response to the current communication mode being the coverage enhancement mode, the network device determines a DMRS sequence of the PBCH in the first SSB according to a first sequence parameter.

[0109] In the embodiment of the present application, the coverage enhancement mode can be understood as a mode of repeatedly transmitting SSB. The network device can repeatedly send an SSB with the same SSB index to the terminal device multiple times in the coverage enhancement mode. Among them, the first SSB can be any SSB that is repeatedly transmitted in the coverage enhancement mode. The first sequence parameter can have a mapping relationship with the repetition identifier of the first SSB. The repetition identifier of the first SSB can be used to indicate the repetition index (repetition index) of the first SSB. For example, assuming that the first SSB is the third repeated transmission of an SSB with an SSB index of 1, the repetition identifier of the first SSB can be a digital identifier 3. It should be noted that the repetition identifier in the embodiment of the present application can also be called a repetition index, or repetition index, and the specific name is not limited here.

[0110] In some embodiments, the mapping relationship between the repetition identifier of the first SSB and the first sequence parameter can be configured by the network device. The mapping relationship can be configured in the form of a table or in the form of a function expression.

[0111] Optionally, the manner in which the network device configures a mapping relationship between a repetition identifier of the first SSB and a first sequence parameter may include:

[0112] Method 1: The network device configures a mapping relationship between the repetition identifier of the first SSB and the first sequence parameter.

[0113] Exemplarily, the mapping relationship between the repetition flag of the first SSB and the first sequence parameter may be as shown in Table 2:

[0114] Table 2

[0115] Repeat logo First sequence parameters 1 A 2 B 3 C 4 D

[0116] The repetition flag of the first SSB is 1, which may indicate that the first SSB is transmitted for the first time. The value A of the corresponding first sequence parameter may be the value in the above formula (1) specified in the current NR protocol. The value of A, that is, A can take any value of 0, 1, 2, ..., 7, which may depend on the SSB index of the first SSB. The repetition flag of the first SSB is 2, which may indicate that the first SSB is transmitted for the second time, and the corresponding value B of the first sequence parameter may be a value different from A, for example, it may be 8. Similarly, the repetition flag of the first SSB is 3, which may indicate that the first SSB is transmitted for the third time, and the corresponding value C of the first sequence parameter may be a value different from A and B, for example, it may be 9. The repetition flag of the first SSB is 4, which may indicate that the first SSB is transmitted for the fourth time, and the corresponding value D of the first sequence parameter may be a value different from A, B and C, for example, it may be 10. It should be noted that the above values ​​are for example only and do not constitute a limitation on the embodiments of the present application.

[0117] Optionally, since the repetition flag of the first SSB is 1, the first sequence parameter can be specified in the current NR protocol. The network device may only configure the case where the repetition flag of the first SSB is greater than 1. The mapping relationship between the repetition flag of the first SSB configured by the network device and the first sequence parameter may be as shown in Table 3:

[0118] Table 3

[0119] Repeat logo First sequence parameters 2 B 3 C 4 D

[0120] Method 2: The network device configures the mapping relationship between the repetition identifier of the first SSB, the first sequence parameter, and the SSBindex of the first SSB.

[0121] Example 1: The mapping relationship between the repetition flag of the first SSB, the first sequence parameter, and the SSB index of the first SSB may be as shown in Table 4:

[0122] Table 4

[0123]

[0124] Wherein, when the repetition flag of the first SSB is 1, the first sequence parameter may be the value in the above formula (1) specified in the current NR protocol. For example, assuming that the SSB index of the first SSB is 1 and the repetition flag of the first SSB is 1, then the value a corresponding to the first sequence parameter can be 1. For another example, assuming that the SSB index of the first SSB is 2 and the repetition flag of the first SSB is 1, then the value b corresponding to the first sequence parameter can be 2.

[0125] For the case where the repetition identifier of the first SSB is greater than 1, the first sequence parameter can be configured by the network device. For example, assuming that the SSB index of the first SSB is 1 and the repetition identifier is 2, the corresponding first sequence parameter can be a1; the SSB index of the first SSB is 2 and the repetition identifier is 2, the corresponding first sequence parameter can be b1, and b1 and a1 are different. In this way, for SSBs with different SSBindexes but the same repetition identifiers, different first sequence parameters can correspond to them, thereby determining different DMRS sequences.

[0126] Since the repetition flag of the first SSB is 1, the first sequence parameter can be specified in the current NR protocol. The mapping relationship between the value of the first SSB repetition identifier, the first sequence parameter, and the SSB index of the first SSB configured by the network device can be shown in Table 5:

[0127] Table 5

[0128]

[0129] It should be noted that for different frequency bands, the maximum number of SSBs that can be transmitted in an SS burst is different, which means that the number of times an SSB can be repeatedly transmitted is different. The above tables all take the example that the SSB can be repeatedly transmitted up to 4 times, that is, the maximum repetition flag is 4. For example, for the S-band (frequency band) of FR1<3GHz, the SSB can be repeatedly transmitted up to 4 times in an SS burst. It is understandable that in other frequency bands, the maximum number of times an SSB can be repeatedly transmitted can be other values, such as 2 or 8, etc., which can be specifically agreed upon by the protocol, and this application is not limited here.

[0130] Example 2: The mapping relationship among the repetition identifier of the first SSB, the first sequence parameter and the SSB index of the first SSB can be a function mapping relationship.

[0131] Optionally, the network device may configure a function mapping relationship between the repetition flag of the first SSB, the first sequence parameter, and the SSBindex of the first SSB. For example, see formula (2):

[0132]

[0133] in, Represents the first sequence parameter, i ssb Represents the SSB index of the first SSB, and repIndex represents the repetition identifier of the first SSB.

[0134] In one possible implementation,

[0135] After the network device configures the mapping relationship between the repetition identifier of the first SSB and the first sequence parameter in the above manner, the first sequence parameter can be determined according to the repetition identifier of the first SSB and the mapping relationship between the repetition identifier of the first SSB and the first sequence parameter. Then, the DMRS sequence of the PBCH in the first SSB is determined according to the first sequence parameter. For example, the scrambling sequence generator of the following formula (3) can be used according to the first sequence parameter, that is, C init-new , generate the DMRS sequence of PBCH:

[0136]

[0137] In some embodiments, the network device may also configure a mapping relationship between the repetition flag of the first SSB and the DMRS sequence of the PBCH in the first SSB. It can be understood that when the repetition flag of the first SSB is equal to 1, the DMRS sequence of the PBCH in the first SSB can be determined in the manner specified by the current NR protocol; when the repetition flag of the first SSB is greater than 1, a new scrambling sequence generator, namely C can be used in combination with the repetition flag of the first SSB. init-m , generate the DMRS sequence of PBCH. For example, see formula (4):

[0138] C init-m =f(C init ,repIndex) (4)

[0139] Among them, C init It can be calculated by the above formula (1), repIndex represents the repetition identifier of the first SSB. The value range of repIndex can be predefined by the protocol. For example, for the coverage enhancement mode in NTN communication, the value of repIndex can be at least one of {1, 2, 4, 8}.

[0140] In one possible implementation, C init-m =C init +repIndex.

[0141] It is understandable that the mapping relationship between the repetition identifier of the first SSB and the first sequence parameter can also be predefined by the protocol. For example, the contents of the above tables (Table 2, Table 3, Table 4 and Table 5) can be specified by the protocol, and this application does not limit this.

[0142] In some embodiments, the network device can identify whether the current communication mode is a coverage enhancement mode. In response to the current communication mode being a coverage enhancement mode, the network device can determine the DMRS sequence of the PBCH in the first SSB in the above manner.

[0143] Optionally, the network device identifying whether the current communication mode is the coverage enhancement mode may include:

[0144] Method (1): The network device identifies whether the current communication mode is the coverage enhancement mode based on the current communication frequency band.

[0145] Among them, for NTN communication scenarios, the use of coverage enhancement mode is an effective means to improve communication performance. In one possible implementation, the network device can automatically enter the coverage enhancement mode in the frequency band of NTN communication. In this way, the network device can identify whether the current communication mode is the coverage enhancement mode by determining whether the communication frequency band used for the current communication belongs to the first frequency band range. The first frequency band range can be a dedicated frequency band for NTN communication, such as the n256 frequency band and the n255 frequency band. In response to the fact that the currently used communication frequency band belongs to the first frequency band range, the network device can identify that the current communication mode is the coverage enhancement mode.

[0146] Method (2): The network device identifies whether the current communication mode is the coverage enhancement mode based on the central beam elevation angle of the current communicating satellite beam.

[0147] In some embodiments, the network device may calculate the center beam elevation angle of the satellite beam of the current communication, and identify whether the current communication mode is the coverage enhancement mode based on the center beam elevation angle of the satellite beam of the current communication. In one possible implementation, in response to the elevation angle of the satellite beam of the current communication being less than or equal to a first threshold, the current communication mode may be identified as the coverage enhancement mode. The first threshold may be configured by the network device or predefined by the protocol, for example, 30 degrees.

[0148] Method (3): The network device identifies whether the current communication mode is the coverage enhancement mode based on the number of terminal devices that have sent the first signal.

[0149] In some embodiments, the network device can determine the communication quality of the current communication area. When the network device determines that the communication quality of the current communication area is poor, a first signal can be sent to a terminal device in an idle state or an inactive state in the current communication area. Among them, the first signal can be used to indicate that the communication quality of the current communication area is poor. The first signal can be, for example, an alert signal, which can be sent, for example, through an alert channel (a channel with better communication performance than the current satellite channel). Optionally, the network device can send the first signal before sending a paging message. In response to the number of terminal devices that have sent the first signal being greater than or equal to a second threshold, the network device can identify the current communication mode as a coverage enhancement mode. That is, when the number of terminal devices that have sent the first signal is greater than or equal to the second threshold, it can be indicated that the current communication quality is lower than the communication quality threshold, and the network device can automatically enter the coverage enhancement mode to meet the communication needs.

[0150] Method (4): The network device identifies whether the current communication mode is the coverage enhancement mode based on the physical cell identifier of the terminal device.

[0151] In some embodiments, for NTN communication scenarios, fixed cell identifiers can be used in specific sub-satellite cell locations. For example, in a single-satellite multi-cell scenario, PCI=m~n can be used as the PCI of cells in the edge areas of satellite coverage. Usually, cells in the edge areas of satellite coverage have a smaller communication angle, and the path loss is greater than that of cells in the center of the coverage area. In response to the PCI of the terminal device belonging to the first identification range, the network device can identify that the current communication mode is the coverage enhancement mode. Among them, the first identification range can be used to represent the PCI of cells in the edge areas of satellite coverage, which can be predefined by the protocol. In other words, the network device can determine the cell location based on the PCI of the terminal device, and when the cell location is at the edge of satellite coverage, it can automatically enter the coverage enhancement mode to improve communication performance.

[0152] S402, the network device sends a first SSB to the terminal device. Correspondingly, the terminal device receives the first SSB from the network device.

[0153] In an embodiment of the present application, in the coverage enhancement mode, after the network device determines the DMRS sequence of the PBCH in the first SSB according to the first sequence parameter, the first SSB can be sent to the terminal device. Accordingly, the terminal device can receive the first SSB from the network device.

[0154] In some embodiments, the terminal device may identify whether the current communication mode is a coverage enhancement mode.

[0155] Optionally, the terminal device identifying whether the current communication mode is the coverage enhancement mode may include:

[0156] Method 1) The terminal device identifies whether the current communication mode covers the enhanced mode based on the current communication frequency band.

[0157] In some embodiments, the terminal device can identify whether the current communication mode is the coverage enhancement mode by determining whether the communication frequency band used for the current communication belongs to the first frequency band range. The first frequency band range may be a frequency band dedicated to NTN communication, such as the n256 frequency band and the n255 frequency band. In response to the communication frequency band currently used belonging to the first frequency band range, the terminal device can identify that the current communication mode is the coverage enhancement mode.

[0158] Method 2) The terminal device identifies whether the current communication mode covers the enhanced mode based on the reference sequence parameters.

[0159] The reference sequence parameter can be understood as the above formula (1) specified in the current NR protocol. The value of .

[0160] In some embodiments, the terminal device may first calculate the reference sequence parameters (i.e. ), a blind check is performed on the DMRS sequence of the PBCH in the first SSB. If the Cinit used to generate the DMRS sequence of the PBCH in the first SSB cannot be identified based on the reference sequence parameters, that is, the blind check of the DMRS sequence of the PBCH in the first SSB fails, then the current communication mode can be identified as the coverage enhancement mode.

[0161] Method 3) The terminal device identifies whether the current communication mode is the coverage enhancement mode based on the acquired physical cell identifier.

[0162] In some embodiments, after receiving the first SSB, the terminal device can detect the PSS and SSS of the first SSB to obtain the PCI of the cell. In response to the obtained PCI belonging to the first identification range, the terminal device can identify that the current communication mode is the coverage enhancement mode. Among them, the first identification range can be used to represent the PCI of the cell in the edge area of ​​satellite coverage, which can be predefined by the protocol.

[0163] In some embodiments, after the terminal device identifies that the current communication mode is the coverage enhancement mode, it can obtain a pattern corresponding to the coverage enhancement mode. The pattern corresponding to the coverage enhancement mode can be used to indicate the time domain position of the repeated transmission of the SSB. The time domain position of the repeated transmission of the SSB can be understood as the symbol position relationship of the SSB repeatedly transmitted by the network device in one or more wireless frames. Among them, the pattern corresponding to the coverage enhancement mode can also be described as a pattern of repeated transmission of the SSB, or an SSB repetition pattern. The specific name is not limited in this application. According to the pattern corresponding to the coverage enhancement mode, the terminal device can know the transmission period of the first SSB, the number of repetitions, the time domain resources (such as the number of symbols) between each repeated transmission, etc. That is, by obtaining the pattern corresponding to the coverage enhancement mode, the terminal device can determine the time domain position (such as the symbol position) of transmitting the first SSB.

[0164] Optionally, the pattern corresponding to the coverage enhancement mode obtained by the terminal device may include:

[0165] Method ①: The terminal device obtains the pattern corresponding to the coverage enhancement mode from the payload of the PBCH in the first SSB.

[0166] In some embodiments, the pattern corresponding to the coverage enhancement mode can be carried by the payload of the PBCH in the first SSB. That is to say, the network device can configure the pattern corresponding to the coverage enhancement mode in the payload of the PBCH in the first SSB, and then send the first SSB to the terminal device. After the terminal device receives the first SSB, it can obtain the master information block (MIB) message and the payload in the PBCH by decoding the PBCH in the first SSB, and then obtain the pattern corresponding to the coverage enhancement mode from the payload of the PBCH.

[0167] Taking the FR1 frequency band as an example, the PBCH payload includes two reserved bits. Assuming that the number of repeated transmissions of SSB is 4 times, four different patterns can be configured through the 2 bits of information in the PBCH payload. Among them, different patterns can be indicated by different indication fields. For example, the indication field "00" can be used to indicate the first pattern, the indication field "01" can be used to indicate the second pattern, the indication field "10" can be used to indicate the third pattern, and the indication field "11" can be used to indicate the fourth pattern.

[0168] Exemplarily, the pattern corresponding to the coverage enhancement mode can be obtained by Figure 5 Configure as shown. Figure 5As shown, the first pattern can be used to indicate the time domain position occupied by each SSB when 4 SS bursts (SS burst 1, SS burst 2, SS burst 3 and SS burst 4) are transmitted in 2 radio frames, the second pattern can be used to indicate the time domain position occupied by each SSB when 4 SS bursts are transmitted in 4 radio frames, the third pattern can be used to indicate the time domain position occupied by each SSB when 4 SS bursts are transmitted in 8 radio frames, and the fourth pattern can be used to indicate the time domain position occupied by each SSB when 4 SS bursts are transmitted in X radio frames. In some embodiments, each SS burst may include multiple SSBs with different SSBindexes. Figure 5 Take the second pattern in as an example, assuming that the transmission period of the SS burst is 80ms, if according to the current protocol, the network device only sends one SS burst in one period, and according to the configuration of the second pattern, 4 SS bursts can be sent continuously within the first 40ms of 80ms, and each SS burst occupies the first half frame of the 10ms wireless frame. Optionally, each SS burst can be sent in the manner specified in the current NR protocol, for example, 4 SSBs with different SSB indexes can be sent continuously within the half frame (5ms) of the 10ms wireless frame, that is, SSB index 0, SSB index 1, SSB index 2, SSB index 3. For details, please refer to the SSB pattern-A specified in the NR protocol 38.213, which indicates the symbol positions occupied by 4 SSBs with different SSB indexes within 5ms.

[0169] In some embodiments, each SS burst may include multiple SSBs with the same SSB index. For example, SSburst 1 may include 4 SSBs with an SSB index of 0, SS burst 2 may include 4 SSBs with an SSB index of 1, SSburst 3 may include 4 SSBs with an SSB index of 2, and SS burst 4 may include 4 SSBs with an SSB index of 3. Figure 5 Taking the first pattern in as an example, assuming that the sending period of the SS burst is 40ms, according to the configuration of the first pattern, 4 SS bursts can be sent continuously within the first 20ms of 40ms, each SS burst can occupy 5ms, and optionally, each SSburst can include 4 SSBs with the same SSB index.

[0170] Method ②: The pattern corresponding to the coverage enhancement mode is predefined by the protocol.

[0171] In some embodiments, the pattern corresponding to the coverage enhancement mode may be predefined by the protocol. That is, when the terminal device identifies that the current communication mode is the coverage enhancement mode, it may determine the target pattern corresponding to the coverage enhancement mode from the protocol according to the current frequency band and the subcarrier spacing (SCS) of the SSB. Currently, a variety of SSB patterns (such as SSB pattern A, SSB pattern B, SSB pattern C, etc.) are defined in the NR protocol, and the corresponding SSB pattern may be specified for each frequency band and each SCS configuration. For example, in the configuration of 15kHZ SCS in the n1 frequency band, SSB pattern A may be used; in the configuration of the n2 frequency band and 15kHZ SCS, SSB pattern A may also be used; in the configuration of the n5 frequency band and 30kHZ SCS, SSB pattern B may be used. Similarly, the pattern corresponding to the coverage enhancement mode may also be specified by the protocol, and a pattern corresponding to a specific coverage enhancement mode (which may be described as an SSB repetition pattern) may be specified for each frequency band and each SCS configuration. For example, in the n1 frequency band with 15 kHz SCS configuration, SSB repetition pattern A may be used; in the n5 frequency band with 30 kHz SCS configuration, SSB repetition pattern B may be used, etc. The number of repetition transmissions of each SSB may be, for example, 2, 4, 8, etc.

[0172] Compared with method ①, method ② does not occupy PBCH resources and saves bit overhead.

[0173] S403, the terminal device determines the first sequence parameter according to the DMRS sequence of the PBCH in the first SSB.

[0174] In an embodiment of the present application, after the terminal device receives the first SSB from the network device, it can determine the first sequence parameter according to the DMRS sequence of the PBCH in the first SSB.

[0175] In some embodiments, the terminal device may perform a blind check on the DMRS sequence of the PBCH in the first SSB according to the candidate sequence parameters, and then determine the first sequence parameters from the candidate sequence parameters according to the blind check results. Optionally, the candidate sequence parameters may be predefined by the protocol. The candidate sequence parameters may also be configured by a network device, and the network device may send a first message to the terminal device. Accordingly, the terminal device may receive a first message from the network device, and the first message may include the candidate sequence parameters. Optionally, the first message may be a SIB message, or an RRC (radio resource control) message, or an RRC release message, or a DCI (downlink control information) message, or a MAC (media access control) CE (control element) message, which is not limited here. Among them, each sequence parameter in the candidate sequence parameters may have a mapping relationship with the repetition identifier of the SSB. Exemplarily, it is assumed that the candidate sequence parameters include {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, wherein the candidate sequence parameter {0, 1, ..., 7} may correspond to a repetition identifier of SSB 1, the candidate sequence parameter 8 may correspond to a repetition identifier of SSB 2, the candidate sequence parameter 9 may correspond to a repetition identifier of SSB 3, and the candidate sequence parameter 10 may correspond to a repetition identifier of SSB 4. According to the candidate sequence parameters {0, 1, ..., 10}, 10 different values ​​of Cinit for generating the DMRS sequence of PBCH may be calculated (see the above formula (1), namely The value can be {0, 1, ..., 10}). According to the calculated 10 different Cinit values, up to 10 blind checks can be performed on the DMRS sequence of the PBCH, and then one of the Cinit values ​​can be identified according to the blind detection result, and the first sequence parameter corresponding to the Cinit value can be obtained.

[0176] In some embodiments, the terminal device may determine the candidate sequence parameters based on the candidate coding information. Optionally, the candidate coding information may be predefined by the protocol. The candidate coding information may also be configured by a network device, and the network device may send a second message to the terminal device. Accordingly, the terminal device may receive a second message from the network device, and the second message may include the candidate coding information. Optionally, the second message may be a SIB message, or an RRC message, or an RRC release message, or a DCI message, or a MAC CE message, which is not limited here. Among them, the candidate coding information may include multiple Cinit values ​​for generating a DMRS sequence for the PBCH. Optionally, the candidate coding information may be obtained based on possible Cinit values ​​in the current NR protocol, combined with the repetition identifier of the SSB in the coverage enhancement mode, for example, it may be obtained by adding the possible Cinit values ​​specified in the current NR protocol to the repetition identifier of the SSB.

[0177] S404: The terminal device determines the repetition identifier of the first SSB based on the first sequence parameter.

[0178] In an embodiment of the present application, after the terminal device determines the first sequence parameter, the repetition identifier of the first SSB can be determined according to the first sequence parameter. The repetition identifier of the first SSB can be used to indicate the repetition count index of the first SSB. There is a mapping relationship between the first sequence parameter and the repetition identifier of the first SSB.

[0179] Optionally, the mapping relationship between the first sequence parameter and the repetition identifier of the first SSB may be predefined by the protocol or configured by the network device (see Method 1 and Method 2 above). In the case where the mapping relationship between the first sequence parameter and the repetition identifier of the first SSB is configured by the network device, the first message sent by the network device to the terminal device may also include the mapping relationship between the first sequence parameter and the repetition identifier of the first SSB.

[0180] In some embodiments, the terminal device may also determine the index (SSBindex) of the first SSB according to the first sequence parameter. For the case where the first sequence parameter is configured in the above-mentioned manner 1, the terminal device may determine the index of the first SSB according to the first sequence parameter and the index of the reference SSB. Among them, the reference SSB may be an SSB with a repetition identifier of 1. It can be understood that the terminal device may use the index of the SSB with a repetition identifier of 1 received in its detection window as the index of the first SSB. Among them, the terminal device may receive multiple SSBs of repeated transmission in a detection window, and the first SSB may be any one of the multiple SSBs of repeated transmission, and the indexes of the multiple SSBs are the same. When the first SSB is the first SSB of the multiple SSBs of repeated transmission, the index of the first SSB may be determined according to the first sequence parameter; when the first SSB is the nth SSB of the multiple SSBs of repeated transmission, the index of the first SSB received in the detection window may be used as the index of the first SSB, and n is a positive integer greater than 1. For the case where the first sequence parameter is configured in the above-mentioned manner 2, the index of the first SSB may be determined directly according to the mapping relationship between the first sequence parameter and the index of the first SSB. That is to say, in this case, if the detection window of the terminal device does not contain the first SSB of the multiple SSBs that are repeatedly transmitted, the index of the first SSB can also be correctly identified. Optionally, the above-mentioned first message may also include a mapping relationship between the first sequence parameter and the index of the first SSB.

[0181] In some embodiments, the terminal device may determine the time domain position of transmitting the first SSB according to the pattern corresponding to the coverage enhancement mode, the repetition mark of the first SSB, and the index of the first SSB. The time domain position of the first SSB may be used to indicate the symbol position occupied by the first SSB in a radio frame. For example, assuming that the pattern corresponding to the coverage enhancement mode is as follows Figure 6 As shown, if the repetition identifier of the first SSB is 2 and the index of the first SSB is 1, it can be determined that the first SSB occupies symbol 8 to symbol 11.

[0182] In some embodiments, the terminal device can obtain a second SSB, the index of the second SSB is the same as the index of the first SSB, and the terminal device can merge the SSBs with the same index. The merge process may include PSS merge detection and PBCH merge decoding. In one possible implementation, the terminal device can fully obtain multiple SSBs with the same index repeatedly transmitted by the network device, and then merge the SSBs with the same index. For example, the network device can repeatedly transmit 4 SSBs with an index of 1 to the terminal device, and the terminal device can fully obtain the 4 SSBs with an index of 1, and then merge the 4 SSBs with an index of 1. Here, the terminal device can know whether the multiple SSBs with the same index repeatedly transmitted by the network device are fully obtained based on the obtained repetition identifier of each SSB and the index of each SSB, combined with the pattern corresponding to the coverage enhancement mode.

[0183] In some embodiments, the terminal device can identify the frame boundary and time slot boundary of the cell based on the pattern corresponding to the coverage enhancement mode, the index of each SSB received, and the repetition identifier of each SSB, thereby achieving synchronous communication with the network device.

[0184] In an embodiment of the present application, different DMRS sequences may be used for SSBs that are repeatedly transmitted in the coverage enhancement mode, and the first sequence parameter used to generate the DMRS sequence of the PBCH in the first SSB may have a mapping relationship with the repetition identifier of the first SSB, so that the terminal device can identify the repetition identifier of the first SSB by detecting the DMRS sequence of the PBCH in the first SSB, and then can correctly identify the frame boundary and time slot boundary of the cell according to the pattern corresponding to the coverage enhancement mode, and realize synchronous communication with the network device. In this way, it is beneficial to improve communication performance.

[0185] See also Figure 7 , Figure 7 A flowchart of another SSB transmission method provided in an embodiment of the present application, which can be performed by a terminal device and a network device, or can also be performed by a chip in a terminal device and a chip in a network device. The method includes but is not limited to the following steps:

[0186] S701, the network device identifies whether the current communication mode is the coverage enhancement mode.

[0187] In an embodiment of the present application, the network device can identify whether the current communication mode is the coverage enhancement mode.

[0188] Optionally, in response to the current communication frequency band belonging to the first frequency band range, the network device may identify the current communication mode as the coverage enhancement mode. The first frequency band range may be, for example, a dedicated frequency band for NTN communication.

[0189] Optionally, the network device may identify the current communication mode as the coverage enhancement mode in response to the central beam elevation angle of the current communicating satellite beam being less than or equal to a first threshold, wherein the first threshold may be configured by the network device or predefined by a protocol.

[0190] Optionally, the network device may identify the current communication mode as the coverage enhancement mode in response to sending the first signal to the first number of terminal devices, wherein the first number is greater than or equal to the second threshold, and the first signal may be used to indicate that the communication quality of the current communication area is poor.

[0191] Optionally, the network device can identify the current communication mode as the coverage enhancement mode in response to the PCI of the terminal device belonging to the first identification range. The first identification range can be used to represent the PCI of cells in the edge area of ​​satellite coverage, which can be predefined by the protocol.

[0192] When the network device identifies that the current communication mode is the coverage enhancement mode, step S702 may be performed. When the network device identifies that the current communication mode is the non-coverage enhancement mode, SSB may be periodically transmitted in the SSburst manner as defined by the current NR protocol.

[0193] S702, the network device determines a first sequence parameter according to a repetition identifier of the first SSB.

[0194] In an embodiment of the present application, in the coverage enhancement mode, the network device can determine the first sequence parameter according to the repetition identifier of the first SSB, wherein the repetition identifier of the first SSB has a mapping relationship with the first sequence parameter.

[0195] Optionally, when the repetition flag is equal to 1, that is, the first SSB is the first SSB transmitted in the cycle, the value of the first sequence parameter can adopt the parameter in the current NR protocol The value of .

[0196] Optionally, when the repetition flag is greater than 1, that is, the first SSB is an SSB that is repeatedly transmitted within the period, the value of the first sequence parameter may be different from the parameter in the current NR protocol. The value of can be configured by the network device or predefined by the protocol. For example, the parameter The value of can be {0,1,...,7}. If the repetition flag is 2, the first sequence parameter can be 8. If the repetition flag is 3, the first sequence parameter can be 9, and so on.

[0197] Optionally, for the case where the repetition identifier is greater than 1, the network device may also determine the first sequence parameter based on the repetition identifier of the first SSB and the index of the first SSB. There may be a mapping relationship between the repetition identifier of the first SSB, the first sequence parameter, and the index of the first SSB. Among them, the first sequence parameter may be, for example, the sum of the repetition identifier of the first SSB and the index of the first SSB, and the mapping relationship may be specifically configured by the network device or predefined by the protocol.

[0198] S703, the network device determines the DMRS sequence of the PBCH in the first SSB according to the first sequence parameter.

[0199] In the embodiment of the present application, the network device may determine the DMRS sequence of the PBCH in the first SSB according to the first sequence parameter. The first sequence parameter may be used to replace the DMRS sequence in the above formula (1). The parameters of the DMRS sequence of the PBCH in the first SSB can be generated by a scrambling sequence generator (see the above formula (1)).

[0200] Optionally, the first sequence parameter may be one of the candidate sequence parameters. The candidate sequence parameter may be configured by the network device or may be predefined by a protocol. In the case where the candidate sequence parameter is configured by the network device, the network device may perform step S704.

[0201] Optionally, the network device may determine the candidate sequence parameters according to the candidate coding information. The candidate coding information may be configured by the network device or may be predefined by a protocol. In the case where the candidate coding information is configured by the network device, the network device may perform step S705.

[0202] Optionally, S704, the network device sends a first message to the terminal device. Correspondingly, the terminal device receives the first message from the network device.

[0203] Optionally, in an embodiment of the present application, the network device may send a first message to the terminal device. Accordingly, the terminal device may receive the first message from the network device. The first message may include a candidate sequence parameter, and the first sequence parameter may be one of the candidate sequence parameters.

[0204] Optionally, the mapping relationship between the repetition identifier of the first SSB and the first sequence parameter can be configured by the network device, and the first message can also include the mapping relationship between the repetition identifier of the first SSB and the first sequence parameter.

[0205] Optionally, S705, the network device sends a second message to the terminal device. Correspondingly, the terminal device receives the second message from the network device.

[0206] Optionally, in an embodiment of the present application, the network device may send a second message to the terminal device. Correspondingly, the terminal device may receive the second message from the network device. The second message may include candidate coding information.

[0207] S706, the network device sends a first SSB to the terminal device. Correspondingly, the terminal device receives the first SSB from the network device.

[0208] S707, the terminal device identifies whether the current communication mode is the coverage enhancement mode.

[0209] In an embodiment of the present application, the terminal device can identify whether the current communication mode is a coverage enhancement mode.

[0210] Optionally, in response to the current communication frequency band belonging to the first frequency band range, the terminal device may identify that the current communication mode is the coverage enhancement mode. The first frequency band range may be, for example, a dedicated frequency band for NTN communication.

[0211] Optionally, the terminal device can identify the current communication mode as the coverage enhancement mode in response to the acquired PCI belonging to the first identification range. The first identification range can be used to represent the PCI of cells in the edge area of ​​satellite coverage, which can be predefined by the protocol.

[0212] When the terminal device identifies that the current communication mode is the coverage enhancement mode, the first sequence parameter may be determined in the manner described in step S707.

[0213] S708, the terminal device determines the first sequence parameters according to the DMRS sequence of the PBCH in the first SSB.

[0214] In an embodiment of the present application, the terminal device can determine the first sequence parameter based on the DMRS sequence of the PBCH in the first SSB.

[0215] Optionally, the terminal device may perform a blind check on the DMRS sequence of the PBCH in the first SSB according to the candidate sequence parameters, and then determine the first sequence parameter from the candidate sequence parameters according to the blind check result. Each sequence parameter in the candidate sequence parameters may have a mapping relationship with the repetition identifier of the SSB.

[0216] Optionally, the terminal device may also determine the candidate sequence parameters based on the candidate coding information. Then, based on the candidate sequence parameters, a blind check is performed on the DMRS sequence of the PBCH in the first SSB, and the first sequence parameters are determined from the candidate sequence parameters based on the blind check result. The candidate coding information may include multiple Cinit values ​​for generating the DMRS sequence of the PBCH.

[0217] S709: The terminal device determines the repetition identifier of the first SSB based on the first sequence parameter.

[0218] In the embodiment of the present application, the terminal device can determine the repetition identifier of the first SSB according to the first sequence parameter. For the specific implementation process, please refer to Figure 4 The description of step S404 in the illustrated embodiment will not be repeated here.

[0219] S710, the terminal device determines the index of the first SSB based on the first sequence parameter.

[0220] In the embodiment of the present application, the terminal device can determine the index of the first SSB according to the first sequence parameter. For the specific implementation process, please refer to Figure 4 The relevant description of step S404 in the illustrated embodiment will not be repeated here.

[0221] S711, the terminal device obtains a pattern corresponding to the coverage enhancement mode.

[0222] In an embodiment of the present application, the terminal device can obtain a pattern corresponding to the coverage enhancement mode.

[0223] Optionally, the terminal device can obtain a pattern corresponding to the coverage enhancement mode from the payload of the PBCH in the first SSB.

[0224] Optionally, the pattern corresponding to the coverage enhancement mode may be predefined by the protocol.

[0225] S712, the terminal device determines the time domain position of transmitting the first SSB according to the pattern corresponding to the coverage enhancement mode, the repetition flag of the first SSB and the index of the first SSB.

[0226] In an embodiment of the present application, the terminal device can determine the time domain position of transmitting the first SSB based on the pattern corresponding to the coverage enhancement mode, the repetition identifier of the first SSB, and the index of the first SSB.

[0227] It can be understood that according to the process shown in step S701-step S712, the terminal device can determine the repetition identifier of each SSB obtained and the index of each SSB, and then identify the frame boundary and time slot boundary of the cell according to the pattern corresponding to the coverage enhancement mode.

[0228] By implementing the embodiments of the present application, different DMRS sequences can be used for the repeatedly transmitted SSB in the coverage enhancement mode, so that the terminal device can identify the repeated identification of the SSB by detecting the DMRS sequence of the PBCH in the acquired SSB, and then can correctly identify the frame boundary and time slot boundary of the cell according to the pattern corresponding to the coverage enhancement mode, and realize synchronous communication with the network device. In this way, it is beneficial to improve the communication performance.

[0229] The method provided by the embodiment of the present application is described above, and the communication device involved in the embodiment of the present application is described below.

[0230] See also Figure 8 , Figure 8 Schematic diagram of a communication device provided in an embodiment of the present application. Figure 8 As shown, the communication device 800 includes an interface unit 801 and a processing unit 802. Specifically, the processing unit 802 is used to process signaling and / or data, the signaling and / or data may be data received by the interface unit 801, and the processed signaling and / or data may also be sent by the interface unit 801;

[0231] In one implementation, the communication device may be a terminal device, or a device in the terminal device (for example, a chip, or a chip system, or a circuit), or a device that can be used in conjunction with the terminal device.

[0232] The interface unit 801 is configured to receive a first SSB from a network device in response to the current communication mode being a coverage enhancement mode; the coverage enhancement mode is a mode of repeatedly transmitting SSB;

[0233] Processing unit 802 is used to determine a first sequence parameter according to a DMRS sequence of the PBCH in the first SSB; determine a repetition identifier of the first SSB according to the first sequence parameter; the first sequence parameter and the repetition identifier of the first SSB have a mapping relationship, and the repetition identifier of the first SSB is used to indicate the repetition count index of the first SSB; the repetition identifier of the first SSB is used to determine the frame boundary and time slot boundary of the repeatedly transmitted SSB.

[0234] In this embodiment, for the specific implementation of the above interface unit 801 and the processing unit 802, please refer to Figure 4 and Figure 7 The specific implementation steps of the terminal device will not be repeated here.

[0235] In another implementation, the communication device may be a network device, or a device in a network device (eg, a chip, or a chip system, or a circuit), or a device that can be used in conjunction with a network device.

[0236] The processing unit 802 is configured to determine, in response to the current communication mode being a coverage enhancement mode, a DMRS sequence of the PBCH in the first SSB according to a first sequence parameter; the coverage enhancement mode is a mode of repeatedly transmitting the SSB, the first sequence parameter and the repetition identifier of the first SSB have a mapping relationship, and the repetition identifier of the first SSB is used to indicate an index of the number of repetitions of the first SSB;

[0237] Interface unit 801 is used to send a first SSB to a terminal device.

[0238] In this embodiment, for the specific implementation of the above interface unit 801 and the processing unit 802, please refer to Figure 4 and Figure 7 The specific implementation steps of the network equipment will not be repeated here.

[0239] See also Fig. 9 , Fig. 9 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application. Fig. 9 As shown, the communication device 900 may be a communication device or a device used in a communication device, the communication device may be a terminal device or a network device, and the device used in the communication device may be a chip system or a chip in the communication device. The chip system may be composed of a chip, or may include a chip and other discrete devices.

[0240] The communication device 900 includes at least one processor 910, which is used to implement the processing function of the device (such as a terminal device or a network device) in the method provided in the embodiment of the present application. The communication device 900 may also include a communication interface 920, which is used to implement the transceiver operation of the device (such as a terminal device or a network device) in the method provided in the embodiment of the present application. In the embodiment of the present application, the communication interface can be a transceiver, a circuit, a bus, a module or other types of communication interfaces, which are used to communicate with other devices through a transmission medium. For example, the communication interface 920 is used for the device in the communication device 900 to communicate with other devices. The processor 910 uses the communication interface 920 to send and receive data, and is used to implement the method described in the above method embodiment.

[0241] The communication device 900 may also include at least one memory 930 for storing program instructions and / or data. The memory 930 is coupled to the processor 910. The coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units or modules, which may be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 910 may operate in conjunction with the memory 930. The processor 910 may execute program instructions stored in the memory 930. At least one of the at least one memory may be included in the processor.

[0242] The specific connection medium between the communication interface 920, the processor 910 and the memory 930 is not limited in the embodiment of the present application. Fig. 9 The memory 930, the processor 910 and the communication interface 920 are connected via a bus. Fig. 9The connections between the other components are shown in bold lines, which are only for illustration and are not intended to be limiting. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig. 9 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0243] When the communication device 900 is specifically a device for a device (such as a terminal device or a network device), for example, when the communication device 900 is specifically a chip or a chip system, the communication interface 920 may output or receive a baseband signal. When the communication device 900 is specifically a device (such as a terminal or a network device), the communication interface 920 may output or receive a radio frequency signal. In an embodiment of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0244] It should be noted that the above-mentioned communication interface 920 can be used to execute the function of the above-mentioned interface unit 801, and the above-mentioned processor 910 can be used to execute the function of the above-mentioned processing unit 802, which will not be repeated here.

[0245] When the above-mentioned communication device is a chip applied to a terminal device, the chip implements the functions of the terminal device in the above-mentioned method embodiment, and the chip receives information from other devices; or the chip sends information to other devices.

[0246] When the communication device is a chip applied to a network device, the chip implements the function of the network device in the above method embodiment. The chip receives information from other devices; or the chip sends information to other devices.

[0247] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0248] The method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, mobile hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in an access network device or a terminal. Of course, the processor and the storage medium can also be present in a terminal or an access network device as discrete components.

[0249] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, 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 programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed 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 program or instruction may be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a tape; it may also be an optical medium, such as a DVD; it may also be a semiconductor medium, such as a solid state drive (SSD).

[0250] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0251] It is understood that the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

[0252] An embodiment of the present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed, the method executed by the terminal device or the network device in the above method embodiment is implemented.

[0253] An embodiment of the present application further provides a computer program product, which includes a computer program. When the computer program is executed, the method executed by the terminal device or the network device in the above method embodiment is implemented.

[0254] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0255] The descriptions of the various embodiments provided in this application can refer to each other, and the descriptions of the various embodiments have their own emphasis. For parts that are not described in detail in a certain embodiment, refer to the relevant descriptions of other embodiments. For the convenience and simplicity of description, for example, the functions of the various devices and equipment provided in the embodiments of this application and the steps of execution can refer to the relevant descriptions of the method embodiments of this application, and the various method embodiments and the various device embodiments can also refer to, combine or quote each other.

[0256] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A SSB transmission method, characterized in that: The method comprises: In response to the current communication mode being a coverage enhancement mode, receiving a first SSB from a network device; the coverage enhancement mode being a mode of repeatedly transmitting the SSB; Determine a first sequence parameter according to a DMRS sequence of the PBCH in the first SSB; According to the first sequence parameter, the repetition flag of the first SSB is determined; the first sequence parameter and the repetition flag of the first SSB have a mapping relationship, and the repetition flag of the first SSB is used to indicate the repetition number index of the first SSB; the repetition flag of the first SSB is used to determine the frame boundary and time slot boundary of the repeated transmission SSB.

2. The method according to claim 1, characterized in that The determining, according to the DMRS sequence of the PBCH in the first SSB, a first sequence parameter includes: Performing blind detection on the DMRS sequence of the PBCH in the first SSB according to the candidate sequence parameters; Determine the first sequence parameter from the candidate sequence parameters according to the blind detection result.

3. The method according to claim 2, characterized in that The method further comprises: A first message is received from the network device; the first message includes the candidate sequence parameters.

4. The method according to claim 3, characterized in that The first message also includes a mapping relationship between the first sequence parameter and the repetition identifier of the first SSB.

5. The method according to claim 3 or 4, characterized in that The first message is a SIB message, or the first message is an RRC message, or the first message is an RRC release message, or the first message is a DCI message, or the first message is a MAC CE message.

6. The method according to claim 1, characterized in that The mapping relationship between the first sequence parameter and the repetition identifier of the first SSB is predefined by the protocol.

7. The method according to claim 2, characterized in that The method further comprises: receiving a second message from the network device; the second message including candidate encoding information; According to the candidate coding information, a candidate sequence parameter is determined; the candidate coding information and the candidate sequence parameter have a mapping relationship.

8. As claimed in claim 7, characterized in that The second message is a SIB message, or the second message is an RRC message, or the second message is an RRC release message, or the second message is a DCI message, or the second message is a MAC CE message.

9. The method according to claim 3, characterized in that The first sequence parameter also has a mapping relationship with the index of the first SSB; The method further comprises: Determining an index of the first SSB according to the first sequence parameter; Obtain a second SSB; the index of the second SSB is the same as the index of the first SSB; The first SSB and the second SSB are merged.

10. The method according to claim 9, characterized in that The first message also includes a mapping relationship between the first sequence parameter and the index of the first SSB.

11. The method according to claim 9, characterized in that The method further comprises: Acquire a pattern corresponding to the coverage enhancement mode; the pattern is used to indicate the time domain position of the repeated transmission SSB; Determine the time domain position for transmitting the first SSB based on the pattern, the repetition flag of the first SSB and the index of the first SSB.

12. The method according to claim 11, characterized in that The acquiring a pattern corresponding to the coverage enhancement mode includes: Obtain a pattern corresponding to the coverage enhancement mode from the payload of the PBCH in the first SSB.

13. The method according to any one of claims 1 to 12, characterized in that: The method further comprises: In response to the current communication frequency band belonging to the first frequency band range, the current communication mode is determined to be the coverage enhancement mode.

14. The method according to any one of claims 1 to 12, characterized in that: The method further comprises: In response to the acquired physical cell identifier belonging to the first identifier range, it is determined that the current communication mode is the coverage enhancement mode.

15. The method according to any one of claims 1 to 12, characterized in that: The method further comprises: In response to failure of blind detection of the DMRS sequence of the PBCH in the first SSB according to reference sequence parameters, it is determined that the current communication mode is a coverage enhancement mode; the reference sequence parameters are predefined by a protocol.

16. A SSB transmission method, characterized in that: The method comprises: In response to the current communication mode being the coverage enhancement mode, determining the DMRS sequence of the PBCH in the first SSB according to the first sequence parameter; the coverage enhancement mode is a mode of repeatedly transmitting the SSB, the first sequence parameter and the repetition identifier of the first SSB have a mapping relationship, and the repetition identifier of the first SSB is used to indicate the repetition number index of the first SSB; Send the first SSB to the terminal device.

17. The method according to claim 16, characterized in that The method further comprises: A first sequence parameter is determined according to the repetition identifier of the first SSB; the first sequence parameter has a mapping relationship with the repetition identifier of the first SSB.

18. The method according to claim 17, characterized in that The method further comprises: A first message is sent to the terminal device, where the first message includes candidate sequence parameters; and the candidate sequence parameters include the first sequence parameters.

19. The method according to claim 18, characterized in that The first message also includes a mapping relationship between the first sequence parameter and the repetition identifier of the first SSB.

20. The method of claim 19, wherein: The first message also includes a mapping relationship between the first sequence parameter and the index of the first SSB.

21. The method of claim 16, wherein: The method further comprises: A second message is sent to the terminal device; the second message includes candidate coding information, the candidate coding information has a mapping relationship with candidate sequence parameters, and the candidate sequence parameters include the first sequence parameters.

22. The method according to any one of claims 16 to 21, characterized in that: The method further comprises: Determine a pattern corresponding to the coverage enhancement mode; the pattern is used to indicate the time domain position of the repeated transmission SSB.

23. The method of claim 22, wherein: The determining a pattern corresponding to the coverage enhancement mode includes: According to the current communication frequency band and subcarrier spacing, a pattern corresponding to the coverage enhancement mode is determined.

24. The method according to any one of claims 16 to 23, characterized in that: The method further comprises: In response to the current communication frequency band belonging to the first frequency band range, the current communication mode is determined to be the coverage enhancement mode.

25. The method according to any one of claims 16 to 23, characterized in that The method further comprises: In response to the physical cell identifier of the terminal device belonging to the first identifier range, it is determined that the current communication mode is the coverage enhancement mode.

26. A communication device, characterized in that: Comprising a module for executing the method as claimed in any one of claims 1 to 15, or a module for executing the method as claimed in any one of claims 16 to 25.

27. A communication device, characterized in that: The method comprises a processor, wherein the processor is configured to implement the method according to any one of claims 1 to 15 or the method according to any one of claims 16 to 25 through a logic circuit and / or by executing a computer program or instruction.

28. The communication device according to claim 27, characterized in that Also includes: The memory is used to store the computer program or instructions.

29. A communication device, characterized in that: It includes a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device, and the processor is used to implement the method as described in any one of claims 1 to 15 through a logic circuit or execute code instructions; or the method as described in any one of claims 16 to 25.

30. A computer-readable storage medium, characterized in that: The storage medium stores a computer program or instruction. When the computer program or instruction is executed by the communication device, the method according to any one of claims 1 to 15; or the method according to any one of claims 16 to 25 is implemented.

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