Synchronization signal sending power control method and device, terminal, chip and storage medium

Abstract

The embodiment of the invention provides a synchronization signal sending power control method. The method comprises the following steps: executing channel access in at least one first resource block RB set; the channel access result of the at least one first RB set is used for determining the sending power of a first sidelink synchronization signal block (S-SSB) on the at least one first RB set, and the channel access result on the at least one first RB set is considered when the S-SSB sending power is determined / allocated for the at least one first RB set. Therefore, the S-SSB sending power can be prevented from being distributed to the first RB set which fails in channel access, and power waste is avoided.

Description

A method, device, terminal, chip and storage medium for controlling transmission power of synchronization signal Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and specifically to a synchronization signal transmission power control method, device, terminal, chip and storage medium. Background Art

[0002] In current sidelink (SL) technology, while determining the resource block (RB) set where the Sidelink Synchronization Signal Block (S-SSB) will be transmitted, S-SSB transmit power is generally allocated to each RB set. Channel access is then performed, and the result of channel access determines the RB set that can ultimately transmit the S-SSB. The RB set that can ultimately transmit the S-SSB may differ from the RB set that was determined in advance to transmit the S-SSB, because some RB sets may not be able to transmit the S-SSB due to channel access failure. In this case, the S-SSB transmit power allocated to these RB sets will be wasted.

[0003] Summary of the Invention

[0004] Embodiments of the present application provide a synchronization signal transmission power control method, device, terminal, chip and storage medium.

[0005] In the first aspect, an embodiment of the present application provides a synchronization signal transmission power control method, which is applied to a terminal, and the method includes: performing channel access on at least one first resource block RB set; the channel access result of at least one first RB set is used to determine the first sidelink synchronization signal block S-SSB transmission power on at least one first RB set.

[0006] In the second aspect, an embodiment of the present application provides a synchronization signal transmission power control device, which includes: an execution unit, configured to perform channel access on at least one first resource block RB set; the channel access result of at least one first RB set is used to determine the first sidelink synchronization signal block S-SSB transmission power on at least one first RB set.

[0007] In a third aspect, an embodiment of the present application provides a terminal including a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the above-mentioned synchronization signal transmission power control method.

[0008] In a fourth aspect, embodiments of the present application provide a chip for implementing the aforementioned synchronization signal transmission power control method. Specifically, the chip includes: a processor for calling and running a computer program from a memory, so that a device equipped with the chip executes the aforementioned synchronization signal transmission power control method.

[0009] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium for storing a computer program, which enables a computer to execute the above-mentioned synchronization signal transmission power control method.

[0010] In a sixth aspect, an embodiment of the present application provides a computer program product, comprising computer program instructions, which enable a computer to execute the above-mentioned synchronization signal transmission power control method.

[0011] In a seventh aspect, an embodiment of the present application provides a computer program, which, when running on a computer, enables the computer to execute the above-mentioned synchronization signal transmission power control method.

[0012] In this method, the terminal may perform channel access on at least one first RB set, and the channel access result of the at least one first RB set may be used to determine the first S-SSB transmit power for the at least one first RB set. Because the channel access result of the at least one first RB set is taken into account when determining / allocating the first S-SSB transmit power for the at least one first RB set, allocating the S-SSB transmit power to the first RB set that failed channel access can be avoided, thereby preventing power waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0014] FIG1 is a schematic diagram of sideline communication within network coverage provided by an embodiment of the present application;

[0015] FIG2 is a schematic diagram of sideline communication with partial network coverage provided by an embodiment of the present application;

[0016] FIG3 is a schematic diagram of sideline communication outside network coverage provided by an embodiment of the present application;

[0017] FIG4 is a schematic diagram of sideline communication with a central control node provided in an embodiment of the present application;

[0018] FIG5 is a schematic diagram of a unicast transmission method provided in an embodiment of the present application;

[0019] FIG6 is a schematic diagram of a multicast transmission method provided in an embodiment of the present application;

[0020] FIG7 is a schematic diagram of a broadcast transmission method provided in an embodiment of the present application;

[0021] FIG8 is a schematic diagram of the time slot structure in NR-V2X provided in an embodiment of the present application;

[0022] FIG9 is a schematic diagram showing changes in the OFDM symbols available in a time slot of a PSSCH in different transmissions provided by an embodiment of the present application;

[0023] FIG10 is a schematic diagram of a second-order SCI mapping method provided in an embodiment of the present application;

[0024] FIG11 is a schematic diagram of the time-frequency domain position of a PSCCH DMRS provided in an embodiment of the present application;

[0025] FIG12 is a schematic diagram of the time domain position of 4 DMRS symbols when the PSSCH has 13 symbols provided in an embodiment of the present application;

[0026] FIG13 is a schematic diagram of a single-symbol DMRS frequency domain type 1 provided in an embodiment of the present application;

[0027] FIG14 is a schematic diagram of the time-frequency position of the SL CSI-RS provided in an embodiment of the present application;

[0028] FIG15 is a schematic diagram of an example of channel occupancy time and channel occupancy provided in an embodiment of the present application;

[0029] FIG16 is a schematic diagram of frequency domain resource division provided in an embodiment of the present application;

[0030] FIG17 is a schematic diagram of an example of S-SSB time domain resource configuration provided in an embodiment of the present application;

[0031] FIG18 is a time-frequency structure diagram of an S-SSB provided in an embodiment of the present application;

[0032] FIG19 is a schematic diagram of S-SSB time-frequency domain mapping provided in an embodiment of the present application;

[0033] FIG20 is a timing diagram of sidelink synchronization signal transmission power control / allocation provided in an embodiment of the present application;

[0034] FIG21 is a schematic diagram of a flow chart of a synchronization signal transmission power control method according to an embodiment of the present application;

[0035] FIG22 is a schematic diagram of a first implementation scheme of synchronization signal transmission power control provided in an embodiment of the present application;

[0036] FIG23 is a second schematic diagram of an implementation scheme for synchronization signal transmission power control provided in an embodiment of the present application;

[0037] FIG24 is a third schematic diagram of an implementation scheme for synchronization signal transmission power control provided in an embodiment of the present application;

[0038] FIG25 is a second timing diagram of sidelink synchronization signal transmission power control / allocation provided in an embodiment of the present application;

[0039] FIG26 is a fourth schematic diagram of an implementation scheme for synchronization signal transmission power control provided in an embodiment of the present application;

[0040] FIG27 is a fifth schematic diagram of an implementation scheme for synchronization signal transmission power control provided in an embodiment of the present application;

[0041] FIG28 is a sixth schematic diagram of an implementation scheme for synchronization signal transmission power control provided in an embodiment of the present application;

[0042] FIG29 is a schematic diagram of the structure of a synchronization signal transmission power control device according to an embodiment of the present application;

[0043] FIG30 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0044] Figure 31 is a schematic structural diagram of the chip of an embodiment of the present application. DETAILED DESCRIPTION

[0045] The following will describe the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0046] The technical solutions of the embodiments of the present application can be applied to various side communication systems. To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies of the embodiments of the present application are explained below. The following related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all fall within the protection scope of the embodiments of the present application.

[0047] 1. Sideline communication in different network coverage environments

[0048] In side communication, according to the network coverage of the communicating terminal, it can be divided into side communication within the network coverage, side communication with partial network coverage, side communication outside the network coverage, and side communication with a central control node, as shown in Figures 1, 2, 3 and 4 respectively.

[0049] As shown in FIG1 , in sideline communications within network coverage, all terminals performing sideline communications are within the coverage of the same base station. Thus, the above terminals can perform sideline communications based on the same sideline configuration by receiving configuration signaling from the base station.

[0050] As shown in Figure 2, in the case of sidelink communication with partial network coverage, some terminals performing sidelink communication are located within the coverage of the base station. These terminals can receive the configuration signaling from the base station and perform sidelink communication according to the configuration of the base station. However, terminals located outside the network coverage cannot receive the configuration signaling from the base station. In this case, the terminals outside the network coverage will determine the sidelink configuration based on the pre-configuration information and the information carried in the Physical Sidelink Broadcast Channel (PSBCH) sent by the terminals within the network coverage, thereby performing sidelink communication.

[0051] As shown in FIG3 , for sideline communications outside network coverage, all terminals performing sideline communications are located outside network coverage, and all terminals determine sideline configurations according to pre-configured information and perform sideline communications.

[0052] As shown in Figure 4 , for sideline communication with a central control node, multiple terminals form a communication group, which includes a central control node, such as UE1 in Figure 4 . The central control node can also be called a cluster header (CH). The central control node has at least one of the following functions, but is not limited to: establishing the communication group; managing the joining and leaving of group members; coordinating resources, allocating sideline transmission resources to other terminals, receiving sideline feedback information from other terminals, and coordinating resources with other communication groups.

[0053] 2. Device to Device (D2D) / Vehicle to Everything (V2X)

[0054] Device-to-device communication is a sidelink transmission technology based on D2D. Unlike traditional cellular systems, where communication data is received or sent via base stations, it offers higher spectrum efficiency and lower transmission latency. The connected vehicle system utilizes direct end-to-end communication. The 3rd Generation Partnership Project (3GPP) defines two transmission modes: Mode 1 and Mode 2.

[0055] Mode 1: The terminal's transmission resources are allocated by the base station, and the terminal transmits data on the sidelink based on the allocated resources. The base station can allocate resources for either single transmissions or semi-static transmissions. As shown in Figure 1, when the terminal is within network coverage, the network allocates transmission resources for sidelink transmissions.

[0056] Mode 2: The terminal selects a resource from the resource pool for data transmission. As shown in Figure 3, when the terminal is outside the cell coverage area, it autonomously selects a transmission resource from the pre-configured resource pool for sidelink transmission. Alternatively, as shown in Figure 1, the terminal autonomously selects a transmission resource from the network-configured resource pool for sidelink transmission.

[0057] 3. New Radio-Vehicle to Everything (NR-V2X)

[0058] In NR-V2X, autonomous driving needs to be supported, which places higher requirements on data interaction between vehicles, such as higher throughput, lower latency, higher reliability, larger coverage, and more flexible resource allocation.

[0059] LTE-V2X supports broadcast transmission, while NR-V2X introduces unicast and multicast transmission modes. For unicast transmission, there is only one receiving terminal. For example, in Figure 5, unicast transmission is performed between UE1 and UE2. For multicast transmission, the receiving terminals are all terminals in a communication group, or all terminals within a certain transmission distance. As shown in Figure 6, UE1, UE2, UE3, and UE4 form a communication group, where UE1 transmits data, and the other terminal devices in the group are all receiving terminals. For broadcast transmission, the receiving terminal is any terminal around the transmitting terminal. As shown in Figure 7, UE1 is the transmitting terminal, and the other terminals around it, UE2 to UE6, are all receiving terminals.

[0060] 4. NR-V2X system frame structure

[0061] The time slot structure in NR-V2X is shown in Figure 8:

[0062] FIG8(a) is a schematic diagram of a time slot structure in which a physical sidelink feedback channel (PSFCH) is not included in the time slot; FIG8(b) is a schematic diagram of a time slot structure in which a PSFCH is included.

[0063] The NR-V2X Physical Sidelink Control Channel (PSCCH) starts at the second sidelink symbol of the timeslot in the time domain, occupies 2 or 3 Orthogonal Frequency Division Multiplexing (OFDM) symbols, and can occupy {10, 12, 15, 20, 25} Physical Resource Blocks (PRBs) in the frequency domain. To reduce the complexity of blind detection of the PSCCH by the user equipment (UE), only one number of PSCCH symbols and PRBs is allowed to be configured in a resource pool. In addition, because the subchannel is the minimum granularity for the allocation of physical sidelink shared channel (PSSCH) resources in NR-V2X, the number of PRBs occupied by the PSCCH must be less than or equal to the number of PRBs contained in a subchannel in the resource pool to avoid additional restrictions on PSSCH resource selection or allocation. In the time domain, the PSSCH also begins with the second sidelink symbol of the timeslot. The last time-domain symbol in the timeslot is the guard period (GP) symbol, and the remaining symbols are mapped to the PSSCH. The first sidelink symbol in the timeslot is a repetition of the second sidelink symbol. The receiving terminal typically uses the first sidelink symbol as an automatic gain control (AGC) symbol; the data on this symbol is not typically used for data demodulation. In the frequency domain, the PSSCH occupies K subchannels, each consisting of N consecutive PRBs.

[0064] When a time slot contains a PSFCH channel, the second to last and third to last symbols in the time slot are used for PSFCH channel transmission, and a time domain symbol before the PSFCH channel is used as a GP symbol, as shown in FIG8 (b).

[0065] 5. Sidelink PSSCH

[0066] In NR-V2X, the PSSCH is used to carry second-order sidelink control information (SCI) (SCI 2-A or SCI 2-B) and data information. The second-order SCI uses polarization coding and fixed quadrature phase shift keying (QPSK) modulation. The data portion of the PSSCH uses low-density parity check (LDPC) code, and the highest supported modulation order is 256QAM.

[0067] In NR-V2X, PSSCH supports up to two stream transmissions and uses a unit precoding matrix to map data on two layers to two antenna ports. At most, only one transport block (TB) can be sent in a PSSCH. However, unlike the transmission method of the PSSCH data part, when PSSCH adopts a dual-stream transmission method, the modulation symbols sent by the second-order SCI on the two streams are exactly the same. This design can ensure the reception performance of the second-order SCI in highly correlated channels.

[0068] Since the maximum number of retransmissions of a PSSCH in NR-V2X is 32, if there are PSFCH resources in the resource pool and the configuration period of PSFCH resources is 2 or 4, the available OFDM symbols in the time slot where different transmissions of a PSSCH are located may change, as shown in Figure 9. If calculated based on the actual number of OFDM symbols in a time slot The difference in the number of symbols available for PSSCH transmission in a time slot may cause Q′ SCI2 Different, and Q′ SCI2 The change of will lead to the change of the size of the TB carried by PSSCH. In order to ensure that the transmission block size (TBS) remains unchanged during multiple transmissions of PSSCH, The actual number of PSFCH symbols is not used. The number of resource elements (REs) occupied by the PSSCH demodulation reference signal (DMRS) and the number of REs occupied by the phase-tracking reference signal (PT-RS), which may change during the retransmission process, are not taken into account.

[0069] The code rate of the second-order SCI can be dynamically adjusted within a certain range. The specific code rate used is indicated by the first-order SCI, so the receiver does not need to perform blind detection of the second-order SCI even after the code rate changes. The modulation symbols of the second-order SCI are mapped in the frequency domain first and then in the time domain, starting from the symbol containing the first PSSCH DMRS. In the OFDM symbol containing the DMRS, the second-order SCI is mapped to the REs not occupied by the DMRS, as shown in Figure 10.

[0070] The data portion of the PSSCH within a resource pool can use multiple different modulation and coding scheme (MCS) tables, including the conventional 64QAM MCS table, the 256QAM MCS table, and the low-spectrum-efficiency 64QAM MCS table. The specific MCS table used in a transmission is indicated by the "MCS table indication" field in the first-order SCI. To control the Peak to Average Power Ratio (PAPR), the PSSCH must be transmitted using contiguous PRBs. Since the subchannel is the minimum frequency-domain resource granularity of the PSSCH, this requires that the PSSCH must occupy contiguous subchannels.

[0071] 6. Sidelink transmission block size

[0072] PSSCH follows the transport block size (TBS) determination mechanism of the physical downlink shared channel (PDSCH) and physical uplink shared channel (PUSCH) in the New Radio (NR), that is, the TBS is determined based on the reference value of the number of REs used for PSSCH in the time slot where the PSSCH is located, so that the actual code rate is as close to the target code rate as possible. The purpose of using the reference value of the number of REs instead of the actual number of REs here is to ensure that the number of REs used to determine the TBS remains unchanged during the PSSCH retransmission process, so that the determined TBS size is the same. To achieve this goal, the reference value N of the number of REs occupied by PSSCH in the TBS determination process is used. RE Determine according to formula (1):

[0073] where n PRB is the number of PRBs occupied by PSSCH, is the number of REs occupied by the first-order SCI (including the REs occupied by the DMRS of the PSCCH), is the number of REs occupied by the second-order SCI, N′ RErepresents the number of reference REs that can be used for PSSCH in a PRB, which is determined by formula (2):

[0074] in: Indicates the number of subcarriers in a PRB; Indicates the number of symbols available for sidelink in a time slot, excluding the last GP symbol and the first symbol used for AGC. or 3. The specific value is indicated by the "PSFCH symbol number" field in the first-order SCI, which is the reference value of the number of symbols occupied by PSFCH. The value of is configured by the Radio Resource Control (RRC) layer parameters and is used to indicate the reference value of the number of REs occupied by PT-RS and CSI-RS. It represents the average number of DMRS REs in a time slot and is related to the DMRS patterns allowed in the resource pool, as shown in Table 1.

[0075] Table 1 DMRS patterns allowed in the resource pool and The corresponding relationship

[0076] 7. Sidelink DMRS

[0077] In NR-V2X, the DMRS pattern of the PSCCH is the same as that of the NR physical downlink control channel (PDCCH). That is, the DMRS exists in each OFDM symbol of the PSCCH and is located in the frequency domain at {#1, #5, #9} REs of a PRB, as shown in Figure 11. The DMRS sequence of the PSCCH is generated by formula (3):

[0078] The pseudo-random sequence c(m) is given by Initialize, where l is the index of the OFDM symbol where the DMRS is located in the time slot, is the index of the time slot where the DMRS is located in the system frame, Indicates the number of OFDM symbols in a time slot, N ID ∈{0,1,…,65535}, in a resource pool N ID The specific value is configured or pre-configured by the network.

[0079] NR-V2X draws on the design of the NR Uu interface and adopts multiple time-domain PSSCH DMRS patterns. The number of available DMRS patterns within a resource pool is related to the number of PSSCH symbols in the resource pool. For a specific number of PSSCH symbols (including the first AGC symbol) and PSCCH symbols, the available DMRS patterns and the position of each DMRS symbol within the pattern are shown in Table 2. Figure 12 shows a schematic diagram of the time-domain position of four DMRS symbols when the PSSCH has 13 symbols.

[0080] Table 2 Number and position of DMRS symbols under different PSSCH and PSCCH symbol numbers

[0081] If multiple time-domain DMRS patterns are configured within the resource pool, the transmitting UE selects the specific time-domain DMRS pattern to use and indicates this in the first-order SCI. This design allows high-speed UEs to select a high-density DMRS pattern, thereby ensuring accurate channel estimation, while low-speed UEs can use a low-density DMRS pattern, thereby improving spectrum efficiency.

[0082] The generation method of the PSSCH DMRS sequence is almost identical to that of the PSCCH DMRS sequence. The only difference is the initialization formula c(m) of the pseudo-random sequence. init middle, p i The i-th cyclic redundancy check (CRC) of the PSCCH that schedules the PSSCH, where L=24 is the number of bits of the PSCCH CRC.

[0083] NR PDSCH and PUSCH support two frequency domain DMRS patterns, namely DMRS frequency domain type 1 and DMRS frequency domain type 2. For each frequency domain type, there are two different types: single DMRS symbol and double DMRS symbol. Single symbol DMRS frequency domain type 1 supports 4 DMRS ports, single symbol DMRS frequency domain type 2 can support 6 DMRS ports, and in the case of double DMRS symbols, the number of supported ports is doubled. However, in NR-V2X, since PSSCH only needs to support a maximum of two DMRS ports, only single symbol DMRS frequency domain type 1 is supported, as shown in Figure 13.

[0084] 8. Sidelink Channel State Information Reference Signal (CSI-RS)

[0085] To better support unicast communication, NR-V2X supports SL CSI-RS. SL CSI-RS is sent only when the following three conditions are met:

[0086] 1) The UE sends the corresponding PSSCH, that is, the UE cannot only send SL CSI-RS;

[0087] 2) Sidelink CSI reporting is activated by higher-layer signaling;

[0088] 3) When sidelink CSI reporting is activated by higher layer signaling, the corresponding bit in the second-order SCI sent by the UE triggers the sidelink CSI reporting.

[0089] The maximum number of ports supported by SL CSI-RS is two. For two ports, SL CSI-RSs from different ports are code-division multiplexed across two adjacent REs in the same OFDM symbol. Within a PRB, the number of SL CSI-RSs per port is one, meaning the density is one. Therefore, within a PRB, an SL CSI-RS appears in at most one OFDM symbol, the specific location of which is determined by the transmitting terminal. To avoid impacting the resource mapping of the PSCCH and second-order SCI, the SL CSI-RS cannot be located in the same OFDM symbol as the PSCCH and second-order SCI. Because the channel estimation accuracy of the OFDM symbol where the PSSCH DMRS resides is higher, and the SL CSI-RSs for two ports occupy two consecutive REs in the frequency domain, the SL CSI-RS cannot be transmitted in the same OFDM symbol as the PSSCH DMRS. The OFDM symbol location of the SL CSI-RS is indicated by the sl-CSI-RS-FirstSymbol parameter in the PC5RRC protocol.

[0090] The position of the first RE occupied by the SL CSI-RS within a PRB is indicated by the sl-CSI-RS-FreqAllocation parameter in the PC5RRC. If the SL CSI-RS is a single port, this parameter is a 12-bit bitmap corresponding to the 12 REs within a PRB. If the SL CSI-RS is a dual port, this parameter is a 6-bit bitmap. In this case, the SL CSI-RS occupies two REs, 2f(1) and 2f(1)+1, where f(1) represents the index of the bit with a value of 1 in the bitmap. The frequency domain position of the SL CSI-RS is also determined by the transmitting terminal, but the determined frequency domain position of the SL CSI-RS cannot conflict with the PT-RS. FIG14 shows a schematic diagram of the time-frequency position of an SL CSI-RS. In FIG14 , the number of SL CSI-RS ports is 2, the sl-CSI-RS-FirstSymbol is 8, and the sl-CSI-RS-FreqAllocation is [b5, b4, b3, b2, b1, b0] = [0, 0, 0, 1, 0, 0].

[0091] 9. 5G unlicensed (unlicensed) spectrum communications (NR-unlicensed, NR-U)

[0092] The NR system introduced by the 3GPP R15 standard is a communication technology for use on existing and new licensed spectrum. The NR system can achieve seamless coverage, high spectrum efficiency, high peak rate and high reliability of cellular networks. In the Long Term Evolution (LTE) system, unlicensed spectrum (or unlicensed spectrum) has been used as a supplementary frequency band to the licensed spectrum for cellular networks. Similarly, the NR system can also use unlicensed spectrum as part of 5G cellular network technology to provide services to users. In the 3GPP R16 standard, the NR system for unlicensed spectrum, called NR-unlicensed (NR-U), was discussed.

[0093] The NR-U system supports two networking modes: licensed spectrum assisted access and unlicensed spectrum independent access. The former requires the use of licensed spectrum to access the network, and the unlicensed spectrum is used as a secondary carrier; the latter can be independently networked through unlicensed spectrum, and the UE can directly access the network through the unlicensed spectrum. The range of unlicensed spectrum used by the NR-U system introduced in 3GPP R16 is concentrated in the 5GHz and 6GHz frequency bands, such as 5925-7125MHz in the United States, or 5925-6425MHz in Europe. In the R16 standard, band 46 (5150MHz-5925MHz) is newly defined for use as unlicensed spectrum.

[0094] Unlicensed spectrum is spectrum designated by countries and regions for use by radio equipment. This spectrum is generally considered shared spectrum, meaning that as long as communications devices meet national or regional regulatory requirements for the spectrum, they can use it without having to apply for exclusive spectrum authorization from the national or regional spectrum management agency. Because the use of unlicensed spectrum must comply with specific national and regional regulations, such as the "Listen Before Talk" (LBT) principle, NR technology requires corresponding enhancements to meet regulatory requirements for unlicensed frequency bands and efficiently utilize unlicensed spectrum to provide services. The 3GPP Release 16 standard primarily standardizes the following aspects of NR-U technology: channel sensing process; initial access process; control channel design; Hybrid Automatic Repeat Request (HARQ) and scheduling; and scheduling-free grant transmission.

[0095] 10. Channel monitoring: LBT

[0096] To ensure the harmonious coexistence of various communication systems using unlicensed spectrum for wireless communications, some countries and regions have established regulatory requirements for the use of unlicensed spectrum. For example, according to European regulations, when communicating on unlicensed spectrum, communication devices must adhere to the "LBT" principle. This means that before transmitting signals on a channel in the unlicensed spectrum, they must first perform LBT, or channel sensing. Only if the channel sensing result indicates that the channel is idle, or if LBT is successful, can the communication device transmit signals on that channel. If the channel sensing result indicates that the channel is busy, or if LBT fails, the communication device cannot transmit signals on that channel. Furthermore, to ensure fair use of shared spectrum resources, if a communication device successfully performs LBT on an unlicensed spectrum channel, the duration for which it can use that channel for communication cannot exceed a certain limit. This mechanism, by limiting the maximum duration of communication after a successful LBT, ensures that different communication devices have the opportunity to access the shared channel, thereby enabling harmonious coexistence of different communication systems on the shared spectrum.

[0097] Although channel sensing is not a global regulatory requirement, it can provide interference avoidance and friendly coexistence benefits for communication transmissions between communication systems on shared spectrum. Therefore, in the design of NR systems on unlicensed spectrum, channel sensing is a feature that must be supported by the communication equipment in the system. From the perspective of system networking, channel sensing includes two mechanisms: load-based equipment (LBE) LBT, also known as dynamic channel sensing or dynamic channel occupancy, and frame-based equipment (FBE) LBT, also known as semi-static channel sensing or semi-static channel occupancy.

[0098] 11. Dynamic channel monitoring

[0099] Dynamic channel monitoring can also be considered as an LBT method based on LBE, and its channel monitoring principle is that the communication equipment performs LBT on the carrier of the unlicensed spectrum after the service arrives, and starts sending signals on the carrier after the LBT is successful. The LBT method of dynamic channel monitoring includes Type 1 (Type1) channel access method and Type 2 (Type2) channel access method. The Type 1 channel access method is a multi-slot channel detection with random backoff based on the adjustment of the contention window size, wherein the corresponding channel access priority (Channel Access Priority Class, CAPC) p can be selected according to the priority of the service to be transmitted. The Type 2 channel access method is a channel access method based on a fixed-length monitoring time slot, wherein the Type 2 channel access method includes Type 2A channel access, Type 2B channel access and Type 2C channel access. The Type 1 channel access method is mainly used for communication equipment to initiate channel occupancy, and the Type 2 channel access method is mainly used for communication equipment to share channel occupancy. A special case that needs to be explained is that when the base station initiates channel occupancy for the synchronization signal / physical broadcast channel (SS / PBCH) block within the transmission discovery reference signal (DRS) window and the DRS window does not include UE unicast data transmission, if the length of the DRS window does not exceed 1ms and the duty cycle of the DRS window transmission does not exceed 1 / 20, then the base station can use Type2A channel access to initiate channel occupancy.

[0100] FIG15 shows an example of a channel occupancy time obtained by a communication device after successful LBT on a channel of an unlicensed spectrum and signal transmission using resources within the channel occupancy time.

[0101] 12. Default channel access mode on the base station side: Type 1 channel access

[0102] Taking the base station as an example, the channel access parameters corresponding to the channel access priority p on the base station side are shown in Table 3. In Table 3, m p It refers to the number of fallback slots corresponding to the channel access priority p, and CWp refers to the contention window (CW) size corresponding to the channel access priority p. min,p Refers to the CW corresponding to the channel access priority p p Minimum value, CW max,p Refers to the CW corresponding to the channel access priority p p The maximum value, T mcot,p It refers to the maximum channel occupancy time corresponding to the channel access priority p.

[0103] If the channel access process is completed, the base station can use the channel to transmit the service to be transmitted. The maximum time length that the base station can use the channel for transmission cannot exceed T mcot,p .

[0104] Table 3 Channel access parameters corresponding to different channel access priorities p

[0105] 13. Channel occupancy time sharing on the base station side

[0106] When the base station initiates the Channel Occupancy Time (COT), in addition to using the resources within the COT for downlink transmission, the resources within the COT can also be shared with the UE for uplink transmission. When the resources within the COT are shared with the UE for uplink transmission, the channel access mode that the UE can use is Type 2A channel access, Type 2B channel access, or Type 2C channel access. Among them, Type 2A channel access, Type 2B channel access, and Type 2C channel access are all channel access modes based on fixed-length monitoring time slots.

[0107] Type 2A channel access:

[0108] The UE uses a 25μs single-slot channel detection method. Specifically, under Type 2A channel access, the UE can monitor the channel for 25μs before starting transmission and transmit after successful channel monitoring.

[0109] Type 2B channel access:

[0110] The UE uses a 16μs single-slot channel detection method. Specifically, in Type 2B channel access, the UE can monitor the channel for 16μs before starting transmission and transmit after successful channel monitoring. The gap between the start position of each transmission and the end position of the previous transmission is 16μs.

[0111] Type 2C channel access:

[0112] The UE transmits after the gap ends without performing channel detection. Specifically, under Type 2C channel access, the UE can directly transmit, where the gap between the start position of the transmission and the end position of the previous transmission is less than or equal to 16μs. The length of the transmission does not exceed 584μs.

[0113] 14. Channel access parameter indication (including cyclic prefix extension (CPE))

[0114] In the NR-U system, when the UE is scheduled to transmit the Physical Uplink Shared Channel (PUSCH) or the Physical Uplink Control Channel (PUCCH), the base station can indicate the channel access method corresponding to the PUSCH or PUCCH by carrying the downlink control information (DCI) of the uplink grant (UL grant) or downlink grant (DL grant). Since some channel access methods need to meet the gap requirements of 16μs or 25μs, the UE can ensure the gap size between two transmissions by transmitting an extended cyclic prefix (CPE). Accordingly, the base station can indicate the CPE length of the first symbol of the UE's uplink transmission.

[0115] When specifically indicating, the base station can explicitly indicate channel access parameters such as CPE length, channel access mode or channel access priority to the UE through joint coding. The following describes the characteristics of the indication mode of channel access parameters introduced in different DCI formats.

[0116] 1) Fallback uplink grant for scheduling PUSCH transmission (DCI format 0_0):

[0117] The standard pre-sets a set of joint channel access mode and CPE length indications, as shown in Table 4. The fallback uplink grant includes 2-bit LBT indication information, which is used to indicate the jointly coded channel access mode and CPE length from the set shown in Table 4. The channel access mode and CPE length are used for PUSCH transmission. If the channel access mode is Type 1 channel access, the UE selects the channel access priority (CAPC) based on the service priority.

[0118] 2) Fallback downlink grant for scheduling PDSCH transmission (DCI format 1_0):

[0119] The standard presets a set of joint indications of channel access mode and CPE length, as shown in Table 4. The fallback downlink grant includes 2-bit LBT indication information, which is used to indicate the jointly coded channel access mode and CPE length from the set shown in Table 4. The channel access mode and CPE length are used for PUCCH transmission, where the PUCCH can carry a positive acknowledgment (ACK) or negative acknowledgment (NACK) corresponding to the PDSCH. If the channel access mode is Type 1 channel access, the UE determines the channel access priority CAPC = 1 for transmitting the PUCCH.

[0120] Table 4 Channel access mode and CPE length joint indication set

[0121] In Table 4, the value of C1 is specified by the protocol. When the subcarrier spacing is 15 kHz and 30 kHz, C1 = 1; when the subcarrier spacing is 60 kHz, C1 = 2. The values ​​of C2 and C3 are configured by higher-layer parameters. When the subcarrier spacing is 15 kHz and 30 kHz, the values ​​of C2 and C3 range from 1 to 28; when the subcarrier spacing is 60 kHz, the values ​​of C2 and C3 range from 2 to 28.

[0122] 3) Non-fallback uplink grant for scheduling PUSCH transmission (DCI format 0_1):

[0123] The higher layer configures an LBT parameter indication set, which includes at least one jointly coded channel access method, CPE length, and CAPC. The non-fallback uplink grant includes LBT indication information, which is used to indicate the jointly coded channel access method, CPE length, and CAPC from the above-mentioned LBT parameter indication set. The channel access method, CPE length, and CAPC are used for PUSCH transmission. If the indicated channel access method is Type 2 channel access, the CAPC indicated at the same time is the CAPC used by the base station when obtaining the COT. The LBT indication information includes a maximum of 6 bits.

[0124] 4) Non-fallback downlink grant for scheduling PDSCH transmission (DCI format 1_1):

[0125] The high layer configures an LBT parameter indication set, and the LBT parameter indication set includes at least one jointly coded channel access method and CPE length. The non-fallback downlink authorization includes LBT indication information, and the LBT indication information is used to indicate the jointly coded channel access method and CPE length from the above-mentioned LBT parameter indication set. The channel access method and CPE length are used for PUCCH transmission, wherein the PUCCH can carry ACK or NACK information corresponding to the PDSCH. If the channel access method is Type 1 channel access, the UE determines that the channel access priority CAPC=1 for transmitting the PUCCH. The LBT indication information includes a maximum of 4 bits.

[0126] In addition to the above explicit indications, the base station can also implicitly indicate the channel access method within the COT. When the UE receives an UL grant or DL ​​grant sent by the base station indicating that the channel access type corresponding to the PUSCH or PUCCH is Type 1 channel access, if the UE can determine that the PUSCH or PUCCH belongs to the COT of the base station, for example, the UE receives a DCI format 2_0 sent by the base station and determines that the PUSCH or PUCCH belongs to the COT of the base station based on the DCI format 2_0, then the UE can update the channel access type corresponding to the PUSCH or PUCCH to Type 2A channel access instead of Type 1 channel access.

[0127] 15. Frequency domain resource allocation for sidelinks

[0128] The frequency domain resource division of the sidelink is similar to that of Uu, as shown in Figure 16. When there are multiple carriers in the frequency domain resources, the terminal and the system need to support the carrier aggregation function. The system can also only support a single-carrier scenario, in which case carrier aggregation is not required. The frequency resources of a carrier can be divided into one or more bandwidth parts (Band Width Part, BWP). Currently, when there are multiple BWPs in the frequency domain, only one BWP can be activated at the same time, and in the SL system, the system currently only supports one sidelink bandwidth part (SL BWP). In the NR-U (unlicensed band) system, a BWP is divided into multiple RB sets, each RB set is 20MHz in size, and an RB set is the smallest unit of LBT. For example, in Figure 16, BWP 1 is divided into RB set 0 to RB set 4.

[0129] 16. S-SSB Time Domain Resource Allocation

[0130] Currently, for both NR V2X and sidelink, S-SSB is transmitted in the time domain with a minimum granularity of time slots, with a period of 160ms. The number of S-SSB time slots in each period varies depending on the subcarrier spacing. For example, the number of S-SSB time slots in a period corresponding to a 15kHz SCS is 1, the number of S-SSB time slots in a period corresponding to a 30kHz SCS is {1, 2}, and the number of S-SSB time slots in a period corresponding to a 60kHz SCS is {1, 2, 4}.

[0131] Figure 17 is a schematic diagram of an example of S-SSB time domain resource configuration. As shown in Figure 17, there are two sets of S-SSBs in one cycle (that is, two sets of synchronization resource groups, such as synchronization resource group 1 and synchronization resource group 2 in Figure 17), and each set of S-SSBs contains 4 S-SSB time slots (that is, synchronization resource time slots), one set for sending and the other set for receiving. For ease of explanation, the design in the embodiment of the present application takes one set as an example as the basic design idea. Figure 18 is a time-frequency structure diagram of an S-SSB. Among them, an S-SSB time slot contains 14 OFDM symbols, which are composed of PSBCH, S-PSS and S-SSS. In the frequency domain, PSBCH occupies 132 subcarriers, and the sidelink primary synchronization signal (Sidelink Primary Synchronization Signal, S-PSS) and sidelink secondary synchronization signal (Sidelink Secondary Synchronization Signal, S-SSS) sequences occupy 127 subcarriers.

[0132] 17. S-SSB time-frequency domain mapping

[0133] Based on the current Release 18 SL technology, the time-frequency domain mapping of S-SSBs is shown in Figure 19. Within an S-SSB period (160ms), there are both Type 1 and Type 2 S-SSBs. Type 1 S-SSBs are S-SSB time slot resources configured in Release 16 / 17 SL, while Type 2 S-SSBs are additional S-SSB time slot resources newly defined in Release 18. Within the frequency domain resources corresponding to an S-SSB time slot, if the frequency domain contains four RB sets, the UE can attempt to map / transmit the S-SSB on one or more of these RB sets. This attempt means that the UE first performs LBT on one RB set. If it detects that this RB set is unoccupied / available, it maps / transmits the S-SSB on that RB set. If transmission on multiple RB sets is required, LBT is performed on each of these RB sets, and the LBT results on each RB set determine whether the S-SSB can be transmitted on that RB set. Within an RB set, S-SSBs are mapped repeatedly in the frequency domain. In multiple RB sets corresponding to a time slot, the S-SSB is also repeated in each RB set.

[0134] In addition, according to the current conclusions, each R16 / R17 S-SSB time slot corresponds to K additional S-SSB time slots, and the intervals between these S-SSB time slots need to be obtained through configuration or pre-configuration.

[0135] The above briefly explains the relevant technologies / terms involved in the embodiments of this application, which will not be repeated in the following embodiments.

[0136] It should be understood that the terms "system" and "network" are often used interchangeably in this document. The term "and / or" in this document is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the objects associated before and after are in an "or" relationship. It should also be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association relationship between A and B. It should also be understood that the "correspondence" mentioned in the embodiments of this application can mean that there is a direct or indirect correspondence between the two, or it can mean that there is an association relationship between the two, or it can mean a relationship between indication and indication, configuration and configuration, etc. It should also be understood that the “predefined” or “predefined rules” mentioned in the embodiments of the present application can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices), and the present application does not limit its specific implementation method. For example, predefined can refer to what is defined in the protocol. It should also be understood that in the embodiments of the present application, the “protocol” may refer to a standard protocol in the field of communications, such as LTE protocols, NR protocols, and related protocols used in future communication systems, and the present application does not limit this.

[0137] It should also be understood that the embodiments of the present application do not limit the specific form of the terminal. As an example, the terminal in the embodiments of the present application may refer to an access terminal, a user equipment (UE), a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal device, a wireless communication device, a user agent or a user device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, an IoT device, a satellite handheld terminal, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a 5G network or a terminal device in a future evolution network, etc.

[0138] In current SL technology, in the frequency domain, S-SSB can be repeated multiple times within a single RB set, and S-SSB can be repeated multiple times within multiple RB sets. In the time domain, the corresponding transmission granularity is one timeslot (including 14 OFDM symbols - the conventional cyclic prefix (CP)). When a terminal transmits an S-SSB in a timeslot, the power control steps are as follows:

[0139] 1) Determine the frequency domain resources where the S-SSB will be sent: for example, which RB sets are occupied in the frequency domain; how many S-SSB repetitions (or how many repeated S-SBBs) are sent on each RB set; the interval between adjacent S-SSBs within an RB set, etc.

[0140] 2) Power control / power allocation: The total transmit power (maximum available transmit power) is P CMAX When performing power control / power allocation, a portion of the power P' is evenly distributed to the S-SSBs on the anchor RB set, and the remaining power P" is evenly distributed to the S-SSBs on the non-anchor RB set. When P' = P CMAX When P" reaches its maximum value, the S-SSBs on all RB sets (anchor RB sets and non-anchor RB sets) receive the same power, meaning the total transmitted power is evenly distributed to each S-SSB in the frequency domain.

[0141] 3) Channel access (multiple channel access): Before the S-SSB timeslot is transmitted, a channel access mechanism, known as channel monitoring (LBT), is required. LBT is performed for each RB set. For example, the channel access mechanism may include downlink-like channel access and uplink-like channel access.

[0142] Quasi-downlink channel access: LBT is performed on N RB sets respectively. For any RB set, if channel access is successful, the corresponding S-SSB can be sent on this RB set; if channel access fails for any RB set, no S-SSB is sent on this RB set.

[0143] Quasi-uplink channel access: LBT is performed on N RB sets separately. For any RB set, if channel access fails, no S-SSB is sent on all N RB sets; if channel access is successful for all N RB sets, the corresponding S-SSB is sent on N RB sets.

[0144] 4) According to the channel access result and based on the above power allocation, S-SSB is sent in the current time slot.

[0145] It should be noted that since the S-SSB can be repeated multiple times in an RB set, the sending of S-SSB on a certain RB set mentioned in the embodiment of the present application can also be understood as sending multiple repeated S-SSBs on the RB set.

[0146] According to the above technical solution, it is necessary to first determine the RB set on which the S-SSB is to be sent and the number of repetitions of the S-SSB in each set, perform power allocation at the same time, and then perform channel access. The RB set on which the S-SSB is finally sent is determined based on the channel access result. The result of the channel access determines the RB set on which the S-SSB can finally be sent. The RB set on which the S-SSB can finally be sent may be different from the RB set on which the S-SSB is to be sent that is determined in advance, because some RB sets may not be able to send S-SSB due to channel access failure. In this way, the S-SSB transmission power allocated to these RB sets will be wasted. In addition, if the S-SSB is sent only on the RB set on which channel access is successful, the sum of the S-SSB transmission power allocated in advance on these RB sets on which channel access is successful may be less than the maximum available transmission power P CMAX , which will result in a lower total power of the current transmitted S-SSB time slot, thus affecting the synchronization effect of SL.

[0147] As shown in Figure 20, assuming that the frequency domain resources determined to transmit S-SSB in time slot n (S-SSB time slot n) include RB set #0, RB set #1, and RB set #2, then power control / power allocation can be done in advance in the frequency domain, that is, the maximum available transmit power P CMAX S-SSBs allocated to RB set #0, RB set #1, and RB set #2. For example, in Figure 20, the powers of S-SSBs allocated to RB set #0, RB set #1, and RB set #2 are P', P'1, and P'2, respectively. However, since channel access fails on RB set #2, S-SSBs can only be sent according to the determined / allocated power on RB set #0 and RB set #1 where channel access is successful, while no S-SSBs are sent on RB set #2. Therefore, the total power (i.e., P'+P'1) for sending S-SSBs on time slot n is less than the maximum available transmit power P CMAX , thus affecting the synchronization effect of SL.

[0148] In view of this, the present application provides a synchronization signal transmission power control method, apparatus, terminal, chip, and storage medium. This method can be executed, for example, by a terminal, or by a chip, chip system, or circuit configured in the terminal, although this is not a limitation in the present application. For ease of description, the following description uses execution by a terminal as an example.

[0149] In this method, the terminal may perform channel access on at least one first RB set, and the channel access result of the at least one first RB set may be used to determine the first S-SSB transmit power for the at least one first RB set. Because the channel access result of the at least one first RB set is taken into account when determining / allocating the first S-SSB transmit power for the at least one first RB set, allocating the S-SSB transmit power to the first RB set that failed channel access can be avoided, thereby preventing power waste.

[0150] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the present application are described in detail below through specific embodiments. The above related technologies can be combined arbitrarily with the technical solutions of the embodiments of the present application as optional solutions, and all of them fall within the scope of protection of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0151] FIG21 is a flow chart of a synchronization signal transmission power control method according to an embodiment of the present application. As shown in FIG21 , the method may include the following steps:

[0152] S2101, perform channel access on at least one first RB set; the channel access result of the at least one first RB set is used to determine the first S-SSB transmission power on the at least one first RB set.

[0153] Here, performing channel access on at least one first RB set can also be understood as performing channel access on each first RB set in the at least one first RB set. For example, assuming that the at least one first RB set includes a first RB set #1 and a first RB set #2, channel access can be performed on each of the first RB set #1 and the first RB set #2. In this embodiment of the present application, performing channel access can also be replaced by performing LBT.

[0154] Determining the first S-SSB transmit power on at least one first RB set may also be understood as determining the first S-SSB transmit power on each first RB set in the at least one first RB set, or may also be understood as determining the first S-SSB transmit power allocated to each first RB set in the at least one first RB set. The first S-SSB transmit power allocated to a first RB set may be 0 or may not be 0.

[0155] In an embodiment of the present application, the S-SSB transmission power (such as the first S-SSB transmission power) on a certain RB set (such as the first RB set) can also be understood as the power allocated to the RB set for sending the S-SSB on the RB set, or can also be understood as the power / transmission power of the S-SSB allocated to the RB set.

[0156] It should be noted that since the S-SSB is repeatedly mapped in the frequency domain within an RB set, the power / transmit power allocated to the S-SSB on a certain RB set is, that is, the total power / total transmit power allocated to all repeatedly mapped S-SSBs on the RB set.

[0157] In some embodiments, the sum of the first S-SSB transmit powers on the first RB set for which the channel access result is successful (i.e., the first RB set for which channel access is successful) in the at least one first RB set is the maximum available transmit power (e.g., denoted as P CMAX ). The maximum available transmit power can also be understood as the total transmit power or maximum transmit power available to the terminal. That is, the terminal may allocate the maximum available transmit power to the first RB set for which the channel access result is successful. Correspondingly, the first S-SSB transmit power allocated to the first RB set for which the channel access result is unsuccessful (i.e., the first RB set for which channel access fails) is 0.

[0158] For example, assuming that the at least one first RB set includes the first RB set #1, the first RB set #2, and the first RB set #3, if the channel access results of the first RB set #1 and the first RB set #2 are successful, and the channel access result of the first RB set #3 is failed, then the sum of the first S-SSB transmit powers on the first RB set #1 and the first RB set #2 is P CMAX For example, the first S-SSB transmission power on the first RB set #1 is P 11 , the first S-SSB transmission power on the first RB set #2 is P 12 , then. P 11 +P 12 =P CMAX .

[0159] In one possible manner, the terminal allocates the same power / transmit power to each S-SSB on the first RB set for each successful channel access. In another possible manner, when the first RB set for successful channel access includes an anchor RB set, the first S-SSB transmit power allocated by the terminal to the anchor RB set is greater than the first S-SSB transmit power allocated to the first RB sets for other successful channel access.

[0160] According to the above technical solution, since the sum of the first S-SSB transmission powers of the first RB set allocated to each channel for successful access is the maximum available transmission power, it can be ensured that the transmission power is used to the maximum extent for the transmission of S-SSB, thereby ensuring the transmission / detection effect of S-SSB.

[0161] In some embodiments, the at least one first RB set includes an anchor RB set; the first RB set for which the channel access result is successful includes the anchor RB set; or the first RB set for which the channel access result is successful does not include the anchor RB set.

[0162] In one example, the first RB set with a successful channel access result includes the anchor RB set. That is, if the anchor RB set channel access is successful, the terminal can set the maximum available transmit power P to CMAX The first RB set allocated to all channels including the anchor RB set to which access is successful.

[0163] In another example, the first RB set with a successful channel access result does not include the anchor RB set. That is, if the anchor RB set channel access fails, the terminal can set the maximum available transmit power P to CMAX The first RB set allocated to all channels with successful access.

[0164] According to the above technical solution, regardless of whether the channel access result of the anchor RB set is successful, the terminal can allocate the maximum available transmit power to the first RB set for which the channel access result is successful. In this way, it can be ensured that if the channel access of the anchor RB set fails, the terminal can still send S-SSBs at the maximum available transmit power, and the sent S-SSBs may still be received by some terminals with stronger capabilities. Among them, terminals with stronger capabilities can also be understood as terminals capable of receiving S-SSBs on RB sets other than the anchor RB set.

[0165] In some embodiments, the at least one first RB set includes an anchor RB set; if channel access to the anchor RB set fails, the first S-SSB transmit power on the at least one first RB set is 0. That is, if channel access to the anchor RB set fails, the first S-SSB transmit power on all first RB sets is 0, that is, no S-SSB is transmitted on all first RB sets.

[0166] In some scenarios, the device communicating with the terminal may be a weak-capability terminal, and the weak-capability device may not be able to receive S-SSB on RB sets other than the anchor RB set. Therefore, if the anchor RB set channel access fails, the terminal may not need to send S-SSB on the at least one first RB set to save energy consumption.

[0167] According to the above technical solution, the terminal can perform channel access on at least one first RB set. The channel access result on the at least one first RB set can be used to determine the first S-SSB transmit power on the at least one first RB set. Because the channel access result of the at least one first RB set is taken into account when determining / allocating the first S-SSB transmit power for the at least one first RB set, it is possible to avoid allocating the S-SSB transmit power to the first RB set that failed channel access, thereby avoiding power waste.

[0168] In some embodiments, before performing channel access on at least one first RB set, the method further includes: determining the second S-SSB transmit power on the at least one first RB set; the sum of the second S-SSB transmit power on at least one first RB set is the maximum available transmit power.

[0169] Among them, determining the second S-SSB transmit power on at least one first RB set can also be understood as determining the second S-SSB transmit power on each first RB set in the at least one first RB set, or can also be understood as determining the second S-SSB transmit power allocated to each first RB set in the at least one first RB set.

[0170] For example, assuming that the at least one first RB set includes a first RB set #1 and a first RB set #2, then before the at least one first RB set performs channel access, the second S-SSB transmit power on the first RB set #1 may be determined to be P 21 , the second S-SSB transmission power on the first RB set #2 is P 22 , and P 21 +P 22 =P CMAX .

[0171] In some embodiments, when the channel access results of the at least one first RB set are all successful, the first S-SSB transmission power on each first RB set is the same as the second S-SSB transmission power on the first RB set.

[0172] That is, if all first RB sets are successfully channel-accessed, the first S-SSB transmit power allocated to each first RB set is the same as the second S-SSB transmit power allocated to each first RB set before channel access is performed. For example, assuming that at least one first RB set includes a first RB set #1 and a first RB set #2, then if before the first RB set #1 and the first RB set #2 perform channel access, the second S-SSB transmit power on the first RB set #1 has been determined to be P 21, the second S-SSB transmission power on the first RB set #2 is P 22 , then the first S-SSB transmission power on the first RB set #1 is equal to P 21 The same, the first S-SSB transmission power on the first RB set #2 is P 22 same.

[0173] In some embodiments, at least one first RB set includes an anchor RB set; if channel access to the anchor RB set is successful, the first S-SSB transmit power on the anchor RB set is the same as or different from the second S-SSB transmit power on the anchor RB set. That is, if channel access to the anchor RB set is successful, the first S-SSB transmit power allocated to the anchor RB set may be the same as or different from the second S-SSB transmit power allocated to the anchor RB set before channel access is performed.

[0174] In some embodiments, the at least one first RB set may be a frequency domain resource (RB set) for sending S-SSB determined before performing channel access. The frequency domain resource for sending S-SSB determined before performing channel access can also be understood as the frequency domain resource for sending S-SSB on a certain time slot (such as time slot n) determined by the terminal before performing channel access. That is, the terminal may predetermine / decide that the frequency domain resources to be used to send S-SSB include at least one first RB set, and then perform channel access on the at least one first RB set, and determine the first S-SSB transmission power on the at least one first RB set based on the channel access result of the at least one first RB set.

[0175] According to the above technical solution, before at least one first RB set performs channel access, if the terminal has determined the S-SSB transmit power (i.e., the second S-SSB transmit power) on the at least one first RB set, the terminal can, after performing channel access, re-determine / allocate the S-SSB transmit power (i.e., the first S-SSB transmit power) on the at least one first RB set based on the channel access result on the at least one first RB set. In this way, it is possible to avoid allocating the S-SSB transmit power to the first RB set where channel access fails. Moreover, in some scenarios, the allocated power that cannot be used due to channel access failure can be reused for S-SSB transmission on the first RB set where channel access is successful after power reallocation. In this way, it is possible to ensure that the transmit power is used to the maximum extent, thereby ensuring the transmission / detection effect of the synchronization signal.

[0176] In some embodiments, the method may further include: obtaining configuration information of the COT, where the configuration information of the COT is used to configure at least one second RB set included in the COT. In other words, the terminal may obtain the at least one second RB set included in the COT based on the configuration information of the COT.

[0177] The configuration information of the COT may be determined by the terminal, for example; or, the configuration information of the COT may come from other terminals.

[0178] In one example, the COT is initiated by the terminal itself, and the configuration information of the COT may be determined by the terminal itself. In another example, the COT is shared by other terminals for use by the terminal, and the configuration information of the COT may come from other terminals.

[0179] In some embodiments, at least one first RB set may include at least one third RB set and the at least one second RB set; the third RB set is a frequency domain resource (RB set) for sending S-SSB determined before performing channel access.

[0180] The at least one first RB set includes at least one third RB set and the at least one second RB set. It can also be understood that the at least one first RB set is the union of the at least one third RB set and the at least one second RB set. For example, assuming that the at least one second RB set (included in the COT) includes RB set #1 and RB set #2, and the at least one third RB set (frequency domain resources for transmitting S-SSBs determined before channel access) includes RB set #2 and RB set #3, then the at least one first RB set may include: RB set #1, RB set #2, and RB set #3.

[0181] In a first possible embodiment, the at least one third RB set includes the at least one second RB set. That is, the at least one second RB set is a subset of the at least one third RB set. For example, the at least one third RB set includes RB set #1 and RB set #2, and the at least one second RB set includes RB set #2.

[0182] In a second possible manner, the at least one third RB set does not include the at least one second RB set. That is, the at least one third RB set does not overlap with the at least one second RB set. For example, the at least one third RB set includes RB set #1, and the at least one second RB set includes RB set #2 and RB set #3.

[0183] In a third possible approach, at least one third RB set and at least one second RB set have partially identical RB sets. That is, at least one third RB set partially overlaps with at least one second RB set. For example, at least one third RB set includes RB set #1 and RB set #2, and at least one second RB set includes RB set #2 and RB set #3.

[0184] According to the method of this embodiment, after learning at least one second RB set included in the COT, the terminal may use the union of the at least one second RB set and the at least one third RB set as at least one first RB set, then perform channel access on the at least one first RB set, and determine the first S-SSB transmit power on the at least one first RB set based on the channel access result of the at least one first RB set. In other words, the terminal may allocate the first S-SSB transmit power to the third RB set for which channel access was successfully performed among the at least one third RB set determined before performing channel access, and may also allocate the first S-SSB transmit power to the second RB set for which channel access was successfully performed among the at least one second RB set included in the COT. In this case, the terminal may transmit an S-SSB on the second RB set for which channel access was successfully performed among the at least one second RB set included in the COT. In this way, the COT resources can continue to be occupied and maintained, thereby preventing users from other systems from preempting the COT resources.

[0185] In some embodiments, when at least one first RB set includes the above-mentioned at least one third RB set and at least one second RB set, the method may further include: determining the third S-SSB transmission power on the at least one first RB set when the channel access process is not completed; the sum of the third S-SSB transmission powers on the at least one first RB set is the maximum available transmission power.

[0186] The fact that the channel access process is not completed may mean that the channel access process has not started, or may mean that the channel access process is in progress and has not ended.

[0187] Among them, determining the third S-SSB transmit power on at least one first RB set can also be understood as determining the third S-SSB transmit power on each first RB set in the at least one first RB set, or can also be understood as determining the third S-SSB transmit power allocated to each first RB set in the at least one first RB set.

[0188] For example, assuming that at least one second RB set includes RB set #1 and RB set #2, and at least one third RB set includes RB set #2 and RB set #3, then at least one first RB set may include: RB set #1, RB set #2, and RB set #3. In this case, before the terminal performs channel access on RB set #1, RB set #2, and RB set #3, or during the process of performing channel access on RB set #1, RB set #2, and RB set #3, the terminal may allocate a third S-SSB transmit power to each RB set in RB set #1, RB set #2, and RB set #3, and the sum of the third S-SSB transmit powers allocated to each RB set is the maximum available transmit power P CMAX .

[0189] In some embodiments, at least one first RB set includes an anchor RB set; when the channel access result of the anchor RB set is successful, the first S-SSB transmit power on the anchor RB set is the same as or different from the third S-SSB transmit power on the anchor RB set.

[0190] That is to say, if the terminal determines the third S-SSB transmit power on at least one first RB set when the channel access process is not completed, then after the channel access process is completed, if the channel access result of the anchor RB set in the at least one first RB set is successful, the first S-SSB transmit power allocated to the anchor RB set may be the same as the third S-SSB transmit power allocated to the anchor RB set by the terminal when the channel access process is not completed, or may be different.

[0191] In some embodiments, before obtaining the configuration information of the COT, the method may further include: determining the fourth S-SSB transmission power on at least one third RB set; the sum of the fourth S-SSB transmission power on at least one third RB set is the maximum available transmission power.

[0192] Among them, determining the fourth S-SSB transmit power on at least one third RB set can also be understood as determining the fourth S-SSB transmit power on each third RB set in the at least one third RB set, or can also be understood as determining the fourth S-SSB transmit power allocated to each third RB set in the at least one third RB set.

[0193] That is, before the terminal learns the at least one second RB set included in the COT, it may first allocate a fourth S-SSB transmit power to each third RB set in the at least one third RB set to be used to send the S-SSB, and the sum of the fourth S-SSB transmit powers allocated to each third RB set is the maximum available transmit power PCMAX .

[0194] In some embodiments, the at least one third RB set includes an anchor RB set; if the channel access result of the anchor RB set is successful, the first S-SSB transmit power on the anchor RB set is the same as or different from the fourth S-SSB transmit power on the anchor RB set. That is, if the channel access result of the anchor RB set is successful, the first S-SSB transmit power allocated to the anchor RB set may be the same as or different from the fourth S-SSB transmit power allocated to the anchor RB set before obtaining the COT configuration information.

[0195] In some embodiments, the method may further include: determining a third S-SSB transmit power on at least one first RB set if the channel access process is not completed; the sum of the third S-SSB transmit powers on the at least one first RB set is the maximum available transmit power. In some embodiments, the at least one third RB set includes an anchor RB set; the third S-SSB transmit power on the anchor RB set is the same as or different from the fourth S-SSB transmit power on the anchor RB set; and if the channel access result of the anchor RB set is successful, the first S-SSB transmit power on the anchor RB set is the same as or different from the third S-SSB transmit power on the anchor RB set.

[0196] That is, the third S-SSB transmit power allocated to the anchor RB set when the channel access process is not completed may be the same as or different from the fourth S-SSB transmit power allocated to the anchor RB set before the COT configuration information is obtained. If the anchor RB set channel access is successful, the first S-SSB transmit power allocated to the anchor RB set may be the same as or different from the third S-SSB transmit power allocated to the anchor RB set when the channel access process is not completed.

[0197] In some embodiments, the method may further include: for each first RB set in at least one first RB set, sending an S-SSB on the first RB set based on the first S-SSB transmit power on the first RB set when the first S-SSB transmit power on the first RB set is not 0.

[0198] For example, assuming that at least one first RB set includes a first RB set #1, a first RB set #2, and a first RB set #3, then if the first S-SSB transmit power on the first RB set #1 is P 11 (P 11 Not equal to 0), the first S-SSB transmission power on the first RB set #2 is P 12 (P12 is not equal to 0), the first S-SSB transmission power on the first RB set #3 is 0, then the terminal can 11 S-SSB is sent on the first RB set #1, according to P 12 The S-SSB is transmitted on the first RB set #2. Since the transmission power of the first S-SSB on the first RB set #3 is 0, the terminal does not transmit the S-SSB on the first RB set #3.

[0199] In some embodiments, since S-SSB can be repeated multiple times on one RB set, according to P 11 Sending S-SSB on the first RB set #1 can also be understood as following P 11 Send multiple repeated S-SSBs on the first RB set #1; according to P 12 Sending S-SSB on the first RB set #2 can also be understood as following P 12 Multiple repeated S-SSBs on the first RB set #2 are sent.

[0200] According to the method of this embodiment, a terminal can perform channel access on at least one first RB set. The channel access result on the at least one first RB set can be used to determine the first S-SSB transmit power on the at least one first RB set, and the terminal can then transmit an S-SSB according to the first S-SSB transmit power on the at least one first RB set. Because the channel access result of the at least one first RB set is taken into account when determining / allocating the first S-SSB transmit power for the at least one first RB set, allocating the S-SSB transmit power to the first RB set where channel access failed can be avoided, thereby avoiding power waste. In addition, because the sum of the first S-SSB transmit powers on the first RB sets where channel access results are successful is the maximum available transmit power, this ensures that the transmit power is used to the maximum extent possible for S-SSB transmission on the first RB set where channel access succeeded, thereby ensuring effective S-SSB transmission / detection.

[0201] The above introduces the synchronization signal transmission power control method provided in the embodiment of the present application. To facilitate understanding of the embodiment of the present application, the following introduces possible implementation schemes of the synchronization signal transmission power control method applicable to the embodiment of the present application with examples.

[0202] For example, possible implementations include:

[0203] Solution 1: Readjust power control / power allocation based on channel access results.

[0204] Solution 2: Do not allocate power in advance, wait for the channel access result, and then perform power control / power allocation based on the channel access result.

[0205] Solution 3: Consider COT information during the channel access process and then readjust power control / power allocation based on the channel access results.

[0206] Solution 4: The channel access process considers COT information and does not perform power allocation in advance. Instead, the system waits for the channel access result and then performs power control / power allocation based on the channel access result.

[0207] The following introduces the above four solutions respectively.

[0208] Option 1

[0209] In solution 1, the UE (terminal) can readjust power control / power allocation based on the channel access result. The process of solution 1 may include:

[0210] 11) UE decides (determines) the target RB set k0, k1, ..., k corresponding to time slot n. n Send S-SSB on the target RB set k0, k1, ..., k in the frequency domain n Power control / power allocation is performed on S-SSB.

[0211] 12) UE sets RB k0, k1, ..., k n Do channel access / LBT.

[0212] One possible case is that if the RB set k0, k1, ..., k n If the channel access results are all successful, then according to the established power (the power allocated in step 11), the RB sets k0, k1, ..., k corresponding to time slot n are allocated. n Send S-SSB on.

[0213] Another possible case is that if the RB set k0, k1, ..., k n If the channel access result of some RB sets in the UE is failed, the UE can re-power control / power allocation for the S-SSBs on the RB sets where channel access was successful. There are three ways to implement power reallocation:

[0214] Implementation method 1: re-power control / power allocation is performed on all S-SSBs on the anchor RB set and the non-anchor RB set.

[0215] For example, assuming that the RB set in which the channel access is successful includes the anchor RB set and the non-anchor RB set, then the UE can set the maximum available transmit power P to CMAX The anchor RB set and non-anchor RB set that are reassigned to the channel access successfully are reallocated.

[0216] Implementation method 2: The power already allocated to the S-SSBs on the anchor RB set remains unchanged, and the remaining power is redistributed to the S-SSBs on the RB set with successful channel access.

[0217] For example, assuming that the RB set for successful channel access includes the anchor RB set and the non-anchor RB set, then when the UE reallocates power, it is not necessary to change the already allocated power for the S-SSBs on the anchor RB set. That is, the power allocated to the S-SSBs on the anchor RB set remains the power allocated to the S-SSBs on the anchor RB set in step 11). Under this premise, the UE can allocate the remaining power to the S-SSBs on RB sets other than the anchor RB set for successful channel access. The remaining power can be expressed as: remaining power = maximum available transmit power - power allocated to the S-SSBs on the anchor RB set.

[0218] Implementation method 3: If the channel access of the anchor RB set fails, all transmit power (maximum available transmit power) is reallocated to the S-SSB on the RB set where the channel access is successful, or no S-SSB is sent on time slot n.

[0219] For ease of understanding, Figure 22 shows an example of implementation method 1 in Solution 1. The process shown in Figure 22 may include the following steps S111 to S115.

[0220] S111: The UE determines that the frequency domain resources for transmitting an S-SSB in time slot n (S-SSB time slot n) include RB set #0, RB set #1, and RB set #2. The UE may also determine the number of repeated S-SSBs to be transmitted on each RB set, as well as the interval between adjacent S-SSBs within an RB set. RB set #0 is the anchor RB set, and RB set #1 and RB set #2 are non-anchor RB sets.

[0221] S112: The UE performs frequency domain power allocation / power control.

[0222] In this step, the UE can use the maximum available transmit power P CMAX The power allocated to the S-SSBs on RB set #0, RB set #1, and RB set #2 determined in S111 is P', the power allocated to the S-SSBs on RB set #0 is P', the power allocated to the S-SSBs on RB set #1 is P'1, and the power allocated to the S-SSBs on RB set #2 is P'2. Where, P'+P'1+P'2=P CMAX .

[0223] S113, UE performs channel access / LBT.

[0224] In this step, the UE can perform channel access / LBT on RB set #1, RB set #2, and RB set #3. In the example of Figure 22, channel access to RB set #2 fails, while channel access to RB set #0 and RB set #1 succeeds.

[0225] S114: The UE re-performs frequency domain power allocation / power control according to the channel access result.

[0226] In this step, the UE can use the maximum available transmit power P CMAX Re-allocated to the RB sets that successfully accessed the channel in S113, namely RB set #0 and RB set #1. For example, the power allocated to the S-SSB on RB set #0 is P", and the power allocated to the S-SSB on RB set #1 is P'3. Among them, the power of the S-SSB on the anchor RB set (RB set #0) and the non-anchor RB set (RB set #1) are both reallocated, and P" + P'3 = P CMAX .

[0227] S115, UE sends S-SSB.

[0228] In this step, the UE may send S-SSB on RB set #0 and RB set #1 corresponding to time slot n according to the power allocated in S114.

[0229] Figure 23 shows an example of implementation method 2 in solution 1. The process shown in Figure 23 may include the following steps S121 to S125.

[0230] S121: The UE determines that the frequency domain resources for transmitting the S-SSB in time slot n (S-SSB time slot n) include RB set #0, RB set #1, and RB set #2. The UE may also determine the number of repeated S-SSBs to be transmitted on each RB set, the interval between adjacent S-SSBs within an RB set, etc. RB set #0 is the anchor RB set, and RB set #1 and RB set #2 are non-anchor RB sets.

[0231] S122: The UE performs frequency domain power allocation / power control.

[0232] In this step, the UE can use the maximum available transmit power P CMAX The power allocated to the S-SSBs on RB set #1, RB set #2, and RB set #3 determined in S121 is P', the power allocated to the S-SSBs on RB set #1 is P'1, and the power allocated to the S-SSBs on RB set #2 is P'2. P'+P'1+P'2=P CMAX .

[0233] S123, UE performs channel access / LBT.

[0234] In this step, the UE can perform channel access / LBT on RB set #1, RB set #2, and RB set #3. In the example of Figure 23, channel access to RB set #2 fails, while channel access to RB set #0 and RB set #1 succeeds.

[0235] S124: The UE re-performs frequency domain power allocation / power control according to the channel access result.

[0236] In this step, the UE can use the maximum available transmit power P CMAX The power allocated to the S-SSB on the anchor RB set (RB set #0) is the same as that allocated to the S-SSB on the anchor RB set in S122, which is P'. The power allocated to the S-SSB on RB set #1 is P'4, which is the maximum available transmit power P CMAX The remaining power in, that is, P'+P'4=P CMAX ,

[0237] S125, UE sends S-SSB.

[0238] In this step, the UE may send S-SSB on RB set #0 and RB set #1 corresponding to time slot n according to the power allocated in S124.

[0239] Option 2

[0240] In solution 2, the UE does not need to perform power allocation in advance, but waits for the channel access result and then performs power control / power allocation based on the channel access result. The process of solution 2 may include:

[0241] 21) UE determines the target RB set k0, k1, ..., k corresponding to time slot n. n Send S-SSB on.

[0242] 22) UE targets RB sets k0, k1, ..., k n Do channel access / LBT.

[0243] 23) UE increases the maximum available transmit power P according to the channel access result. CMAX The S-SSB is allocated to the RB set where channel access is successful, and the S-SSB is sent in time slot n.

[0244] For ease of understanding, Figure 24 shows an example of Solution 2. The process shown in Figure 24 may include the following steps S211 to S214.

[0245] S211: The UE determines that the frequency domain resources for transmitting the S-SSB in time slot n (S-SSB time slot n) include RB set #0, RB set #1, and RB set #2. The UE may also determine the number of repeated S-SSBs to be transmitted on each RB set, the interval between adjacent S-SSBs within an RB set, etc. RB set #0 is the anchor RB set, and RB set #1 and RB set #2 are non-anchor RB sets.

[0246] S212, UE performs channel access / LBT.

[0247] In this step, the UE can perform channel access / LBT on RB set #0, RB set #1, and RB set #2. In the example of Figure 24, channel access to RB set #2 fails, while channel access to RB set #0 and RB set #1 succeeds.

[0248] S213: The UE performs frequency domain power allocation / power control according to the channel access result.

[0249] In this step, the UE can use the maximum available transmit power P CMAX The RB sets allocated to the channel access success in S212 are RB set #0 and RB set #1. For example, the power allocated to the S-SSB on RB set #0 is P', the power allocated to the S-SSB on RB set #1 is P'5, and P'+P'5=P CMAX .

[0250] S214, UE sends S-SSB.

[0251] In this step, the UE may send S-SSB on RB set #0 and RB set #1 corresponding to time slot n according to the power allocated in S213.

[0252] According to the method of the embodiment of the present application, the UE can readjust the power control / power allocation according to the channel access result. The allocated power that cannot be used due to channel access failure can be reused for S-SSB transmission when channel access is successful. In this way, it can ensure that the transmission power is used to the maximum extent, thereby ensuring the transmission / detection effect of the synchronization signal.

[0253] In some scenarios, when the UE determines the RB set for sending the S-SSB, it is not yet known whether there is a COT in the time slot where the S-SSB is to be sent, nor is it known which RB sets are included in the COT. Therefore, the following situation may occur: the RB set determined in advance for sending the S-SSB cannot completely overlap with the RB set included in the COT where the time slot is to be sent, that is, some RB sets in the RB set included in the COT are outside the RB set determined in advance for sending the S-SSB, so the power allocation performed in advance does not take this part of the RB set into account. For this situation, there is no solution to reveal whether channel access is required for this part of the RB set. Assuming that the channel access for this part of the RB set is successful, if an S-SSB is to be sent on this part of the RB set, but at this time there is no power allocated in advance for the S-SSB on this part of the RB set. For example, in Figure 25, when determining which RB sets are used to transmit S-SSB in the first step, there is no COT, so there is no plan to transmit S-SSB in RB set #3. Therefore, during frequency domain power control / power allocation, no power is allocated to RB set #3, and the total transmit power (maximum available transmit power P CMAX ) are all allocated to RB Set #0, RB Set #1, and RB Set #2. However, during channel access, or before time slot n when an S-SSB is about to be sent, a COT exists. To continue to occupy and maintain the COT, an S-SSB must be sent on RB Set #3 in time slot n to ensure that the COT resources can continue to be occupied and maintained. However, since RB Set #3 has no power allocated in advance, an S-SSB cannot be sent on RB Set #3 in time slot n.

[0254] In view of this, the embodiments of this application propose Solutions 3 and 4. Solutions 3 and 4 take the presence of the COT into account during channel access, and based on this, perform channel access and power control / power allocation for S-SSB transmission. This allows the COT resources to remain occupied, thus preventing users from other systems from preempting the COT resources.

[0255] Option 3

[0256] In solution three, the UE may consider the COT information (corresponding to the COT configuration information in the above embodiment) when performing channel access, and then readjust the power control / power allocation according to the channel access result. The process of solution three may include:

[0257] 31) UE determines the target RB set k0, k1, ..., k corresponding to time slot n. n Send S-SSB on the RB set k0, k1, ..., k in the frequency domain n Power control / power allocation is performed on S-SSB.

[0258] 32) At time (n-t1) before time slot n, the UE obtains COT information (COT can be initiated by the UE itself, or it can be shared by other UEs for use by the UE). COT contains RB set k m ,…,k d .

[0259] A possible case (denoted as case #1), the RB set k included in COT m ,…,k d is the target RB set k0, k1, ..., k n In this case, the solution 1 can be implemented. That is, for the target RB set k0, k1, ..., k n Perform channel access / LBT, and re-calibrate the target RB set k0, k1, ..., k based on the channel access result. n Power control / power allocation is performed on S-SSB.

[0260] Another possible case (denoted as case #2), the RB set k included in COT m ,…,k d Not the target RB set k0, k1, ..., k n A subset of RB set k m ,…,k d and the target RB set k0, k1, ..., k n Partial overlap or no overlap. In this case, the UE can reset the target RB set to: RB set k m ,…,k d and the original target RB set k0, k1, ..., k n Thus, the UE can re-allocate the new target RB set (i.e., RB set k) at time (n-t2). m ,…,k d and the original target RB set k0, k1, ..., k n Power control / power allocation is performed on the S-SSB on the union of t2 and t1.

[0261] For the above case #2, that is, the RB set k included in the COT m ,…,k d Not the target RB set k0, k1, ..., k n In the case of a subset of , considering the channel access process, there are two scenarios:

[0262] Scenario 1: If the channel access process for the new target RB set has not yet been completed when power control / power allocation for the S-SSB is re-performed at time (n-t2), power control / power allocation can be performed on the S-SSBs on the new target RB set first. After the channel access process for the new target RB set is completed, power control / power adjustment can be performed again on the S-SSBs on the RB set that successfully accessed the channel based on the channel access result.

[0263] Scenario 2: If the channel access process of the new target RB set has been completed when the power control / power allocation of S-SSB is re-performed at time (n-t2), the power control / power adjustment of the S-SSB on the RB set where channel access is successful can be performed based on the channel access result on the new target RB set.

[0264] For ease of understanding, Figure 26 shows an example of Solution 3. The process shown in Figure 26 may include the following steps S311 to S316.

[0265] S311: The UE determines that the frequency domain resources for transmitting the S-SSB in time slot n (S-SSB time slot n) include RB set #0, RB set #1, and RB set #2. The UE may also determine the number of repeated S-SSBs to be transmitted on each RB set, the interval between adjacent S-SSBs within an RB set, etc. RB set #0 is the anchor RB set, and RB set #1 and RB set #2 are non-anchor RB sets.

[0266] S312: The UE performs frequency domain power allocation / power control.

[0267] In this step, the UE can use the maximum available transmit power P CMAX The power allocated to the S-SSBs on RB set #0, RB set #1, and RB set #2 determined in S311 is P', the power allocated to the S-SSBs on RB set #0 is P', the power allocated to the S-SSBs on RB set #1 is P'1, and the power allocated to the S-SSBs on RB set #2 is P'2. Where, P'+P'1+P'2=P CMAX .

[0268] S313: Re-perform frequency domain power allocation / power control according to the COT information.

[0269] After the UE completes power control / power allocation for RB set #0, RB set #1, and RB set #2, if the COT information is known, the RB set included in the COT and the union of RB set #0, RB set #1, and RB set #2 can be set as the target RB set. For example, in Figure 26, the COT includes RB set #2 and RB set #3, so the target RB set includes: RB set #0, RB set #1, RB set #2, and RB set #3. The UE can re-perform power control / power allocation for the target RB set. For example, the power allocated to the S-SSB on RB set #0 is P', the power allocated to the S-SSB on RB set #1 is P'6, the power allocated to the S-SSB on RB set #2 is P'7, and the power allocated to the S-SSB on RB set #3 is P'8. Among them, P'+P'6+P'7+P'8=P CMAX .

[0270] S314, UE performs channel access / LBT.

[0271] In this step, the UE can perform channel access / LBT on the target RB sets (RB set #0, RB set #1, RB set #2, and RB set #3). In the example of Figure 26, channel access to RB set #2 fails, while channel access to RB set #0, RB set #1, and RB set #3 succeeds.

[0272] S315: The UE re-performs frequency domain power allocation / power control according to the channel access result.

[0273] In this step, the UE can use the maximum available transmit power P CMAX The RB sets allocated to the channel access success in S314 are RB set #0, RB set #1, and RB set #3. For example, the power allocated to the S-SSB on RB set #0 is P', the power allocated to the S-SSB on RB set #1 is P'9, and the power allocated to the S-SSB on RB set #3 is P'10, and P'+P'9+P'10=P CMAX .

[0274] S316, UE sends S-SSB.

[0275] In this step, the UE may send S-SSB on RB set #0, RB set #1, and RB set #3 corresponding to time slot n according to the power allocated in S315.

[0276] Figure 27 shows another example of solution 3. The process shown in Figure 27 may include the following steps S321 to S325.

[0277] S321: The UE determines that the frequency domain resources for transmitting the S-SSB in time slot n (S-SSB time slot n) include RB set #0, RB set #1, and RB set #2. The UE may also determine the number of repeated S-SSBs to be transmitted on each RB set, the interval between adjacent S-SSBs within an RB set, etc. RB set #0 is the anchor RB set, and RB set #1 and RB set #2 are non-anchor RB sets.

[0278] S322: The UE performs frequency domain power allocation / power control.

[0279] In this step, the UE can use the maximum available transmit power P CMAX The power allocated to the S-SSBs on RB set #0, RB set #1, and RB set #2 determined in S321 is P', the power allocated to the S-SSBs on RB set #0 is P', the power allocated to the S-SSBs on RB set #1 is P'1, and the power allocated to the S-SSBs on RB set #2 is P'2. P'+P'1+P'2=P CMAX .

[0280] S323, UE performs channel access / LBT.

[0281] After the UE completes power control / power allocation for RB Set #0, RB Set #1, and RB Set #2, if it learns the Coordination of Transport (COT) information, it can set the union of the RB Sets included in the COT and RB Set #0, RB Set #1, and RB Set #2 as the target RB Set. For example, in Figure 27, the COT includes RB Set #2 and RB Set #3, so the target RB Set includes: RB Set #0, RB Set #1, RB Set #2, and RB Set #3. The UE can perform channel access / LBT on the target RB Set. In the example of Figure 27, channel access to RB Set #2 fails, while channel access to RB Set #0, RB Set #1, and RB Set #3 succeeds.

[0282] S324: The UE re-performs frequency domain power allocation / power control according to the channel access result.

[0283] In this step, the UE can use the maximum available transmit power P CMAX The RB sets allocated to the channel access success in S323 are RB set #0, RB set #1, and RB set #3. For example, the power allocated to the S-SSB on RB set #0 is P', the power allocated to the S-SSB on RB set #1 is P'11, and the power allocated to the S-SSB on RB set #3 is P'12, and P'+P'11+P'12=P CMAX .

[0284] S325, UE sends S-SSB.

[0285] In this step, the UE may send S-SSB on RB set #0, RB set #1, and RB set #3 corresponding to time slot n according to the power allocated in S324.

[0286] Option 4

[0287] In solution 4, the UE can consider COT information when performing channel access, and the UE does not need to perform power allocation in advance, but waits for the channel access result and then performs power control / power allocation based on the channel access result. The process of solution 4 may include:

[0288] 41) UE determines the target RB set k0, k1, ..., k corresponding to time slot n. n Send S-SSB on.

[0289] 42) The UE obtains COT information before time n (COT can be initiated by the UE itself, or can be shared by other UEs for use by the UE). COT contains RB set k m ,…,k d .

[0290] A possible case is that the RB set k included in COT m ,…,k d is the target RB set k0, k1, ..., k n In this case, the original target RB set k0, k1, ..., k n unchanged, and in the target RB set k0, k1, ..., k n Another possible case is that the RB set k included in COT m ,…,k d Not the target RB set k0, k1, ..., k n A subset of RB set k m ,…,k d and the target RB set k0, k1, ..., k n Partial overlap or no overlap. In this case, the UE can reset the target RB set to: RB set k m ,…,k d and the original target RB set k0, k1, ..., k n Thus, the UE can perform the channel access process on the re-set target RB set.

[0291] 43) UE sets the maximum available transmit power P according to the channel access result. CMAX The S-SSB is allocated to the RB set where channel access is successful, and the S-SSB is sent in time slot n.

[0292] For ease of understanding, an example of solution 4 is shown in Figure 28. The process shown in Figure 28 may include the following steps S411 to S414.

[0293] In step S411, the UE determines that the frequency domain resources for transmitting the S-SSB in time slot n (S-SSB time slot n) include RB set #0, RB set #1, and RB set #2. The UE may also determine the number of repeated S-SSBs to be transmitted on each RB set, the interval between adjacent S-SSBs within an RB set, etc. RB set #0 is the anchor RB set, and RB set #1 and RB set #2 are non-anchor RB sets.

[0294] S412, UE performs channel access / LBT.

[0295] If the UR knows the COT information in advance, it can set the target RB set as the union of the RB set included in the COT and RB set #0, RB set #1, and RB set #2. For example, in Figure 28, the COT includes RB set #2 and RB set #3, so the target RB set includes: RB set #0, RB set #1, RB set #2, and RB set #3. The UE can perform channel access / LBT on the target RB set. In the example of Figure 28, channel access to RB set #2 fails, while channel access to RB set #0, RB set #1, and RB set #3 succeeds.

[0296] S413: The UE performs frequency domain power allocation / power control according to the channel access result.

[0297] In this step, the UE can use the maximum available transmit power P CMAX The RB sets allocated to the channel access success in S412 are RB set #0, RB set #1, and RB set #3. For example, the power allocated to the S-SSB on RB set #0 is P', the power allocated to the S-SSB on RB set #1 is P'1, and the power allocated to the S-SSB on RB set #3 is P'2, and P'+P'1+P'2=P CMAX .

[0298] S414, UE sends S-SSB.

[0299] In this step, the UE may send S-SSB on RB set #0, RB set #1, and RB set #3 corresponding to time slot n according to the power allocated in S413.

[0300] According to the method of the embodiment of the present application, the UE can re-perform power control / power allocation according to the channel access result. The allocated power that cannot be used due to channel access failure can be reused for S-SSB transmission when channel access is successful. In this way, it can be ensured that the transmission power is used to the maximum extent, thereby ensuring the transmission / detection effect of the synchronization signal. In addition, the existence of COT is taken into account when performing channel access. On this basis, channel access is performed and power control / power allocation is performed for sending S-SSB. In this way, the COT resources can be maintained occupied, thereby preventing users of different systems from preempting the COT resources.

[0301] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, the technical solution of the present application can be subjected to a variety of simple modifications, and these simple modifications all fall within the scope of protection of the present application. For example, the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present application will no longer describe the various possible combinations separately. For another example, the various different embodiments of the present application can also be arbitrarily combined, as long as they do not violate the idea of ​​the present application, they should also be regarded as the contents disclosed in the present application. For another example, under the premise of no conflict, the various embodiments and / or the technical features in each embodiment described in the present application can be arbitrarily combined with the prior art, and the technical solution obtained after the combination should also fall within the scope of protection of the present application.

[0302] It should also be understood that in the various method embodiments of the present application, the sequence numbers of the above-mentioned processes do not imply a precedence in the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. In addition, in the embodiments of the present application, the terms "downlink," "uplink," and "sidelink" are used to indicate the transmission direction of signals or data, where "downlink" is used to indicate the first direction of transmission of signals or data from a site to a user equipment in a cell, "uplink" is used to indicate the second direction of transmission of signals or data from a user equipment in a cell to a site, and "sidelink" is used to indicate the third direction of transmission of signals or data from user equipment 1 to user equipment 2. For example, "downlink signal" indicates that the transmission direction of the signal is the first direction. In addition, in the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. Specifically, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0303] Based on the aforementioned embodiments, the embodiments of the present application provide a corresponding synchronization signal transmission power control device.

[0304] FIG29 is a schematic diagram of the structure of a synchronization signal transmission power control device provided in an embodiment of the present application, which is applied to a terminal. As shown in FIG29 , a synchronization signal transmission power control device 2900 (hereinafter referred to as device 2900) includes:

[0305] The execution unit 2901 is configured to perform channel access on at least one first resource block RB set; the channel access result of at least one first RB set is used to determine the first sidelink synchronization signal block S-SSB transmission power on at least one first RB set.

[0306] In some embodiments, in at least one first RB set, the sum of the first S-SSB transmit powers on the first RB set where the channel access result is successful is the maximum available transmit power.

[0307] In some embodiments, at least one first RB set includes an anchor RB set; the first RB set for which the channel access result is successful includes the anchor RB set; or the first RB set for which the channel access result is successful does not include the anchor RB set.

[0308] In some embodiments, at least one first RB set includes an anchor RB set; when the channel access result of the anchor RB set is failure, the first S-SSB transmission power on the at least one first RB set is 0.

[0309] In some embodiments, the device 2900 also includes: a first determination unit, configured to determine the second S-SSB transmission power on at least one first RB set before performing channel access on at least one first RB set; the sum of the second S-SSB transmission power on at least one first RB set is the maximum available transmission power.

[0310] In some embodiments, when the channel access results of at least one first RB set are successful, the first S-SSB transmission power on each first RB set is the same as the second S-SSB transmission power on the first RB set.

[0311] In some embodiments, at least one first RB set includes an anchor RB set; when the channel access result of the anchor RB set is successful, the first S-SSB transmit power on the anchor RB set is the same as or different from the second S-SSB transmit power on the anchor RB set.

[0312] In some embodiments, at least one first RB set is a frequency domain resource for transmitting S-SSB determined before performing channel access.

[0313] In some embodiments, the device 2900 also includes: an acquisition unit configured to acquire configuration information of the channel occupancy time COT, and the configuration information of the COT is used to configure at least one second RB set included in the COT; wherein, the at least one first RB set includes at least one third RB set and at least one second RB set; the third RB set is a frequency domain resource for sending S-SSB determined before performing channel access.

[0314] In some embodiments, the configuration information of the COT is determined by the apparatus 2900; or, the configuration information of the COT comes from other terminals.

[0315] In some embodiments, at least one third RB set includes at least one second RB set; or, at least one third RB set does not include at least one second RB set; or, at least one third RB set and at least one second RB set have partially identical RB sets.

[0316] In some embodiments, the device 2900 also includes: a second determination unit, configured to determine the third S-SSB transmission power on at least one first RB set when the channel access process is not completed; the sum of the third S-SSB transmission power on at least one first RB set is the maximum available transmission power.

[0317] In some embodiments, at least one first RB set includes an anchor RB set; when the channel access result of the anchor RB set is successful, the first S-SSB transmit power on the anchor RB set is the same as or different from the third S-SSB transmit power on the anchor RB set.

[0318] In some embodiments, the device 2900 also includes: a third determination unit, configured to determine the fourth S-SSB transmission power on at least one third RB set before obtaining the configuration information of the COT; the sum of the fourth S-SSB transmission power on at least one third RB set is the maximum available transmission power.

[0319] In some embodiments, at least one third RB set includes an anchor RB set; when the channel access result of the anchor RB set is successful, the first S-SSB transmit power on the anchor RB set is the same as or different from the fourth S-SSB transmit power on the anchor RB set.

[0320] In some embodiments, the device 2900 also includes: a fourth determination unit, configured to determine the third S-SSB transmission power on at least one first RB set when the channel access process is not completed; the sum of the third S-SSB transmission power on at least one first RB set is the maximum available transmission power.

[0321] In some embodiments, at least one third RB set includes an anchor RB set; the third S-SSB transmit power on the anchor RB set is the same as or different from the fourth S-SSB transmit power on the anchor RB set; when the channel access result of the anchor RB set is successful, the first S-SSB transmit power on the anchor RB set is the same as or different from the third S-SSB transmit power on the anchor RB set.

[0322] In some embodiments, the device 2900 also includes: a sending unit, configured to send an S-SSB on the first RB set based on the first S-SSB transmit power on the first RB set for each first RB set in at least one first RB set when the first S-SSB transmit power on the first RB set is not 0.

[0323] Those skilled in the art should understand that the relevant description of the above-mentioned synchronization signal transmission power control device in the embodiment of the present application can be understood by referring to the relevant description of the synchronization signal transmission power control method in the embodiment of the present application.

[0324] Figure 30 is a schematic structural diagram of a communication device 3000 provided in an embodiment of the present application. The communication device 3000 shown in Figure 30 includes a processor 3010, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0325] Optionally, as shown in FIG30 , the communication device 3000 may further include a memory 3020. The processor 3010 may call and execute a computer program from the memory 3020 to implement the method in the embodiment of the present application.

[0326] The memory 3020 may be a separate device independent of the processor 3010 , or may be integrated into the processor 3010 .

[0327] Optionally, as shown in FIG30 , the communication device 3000 may further include a transceiver 3030 , and the processor 3010 may control the transceiver 3030 to communicate with other devices, specifically, to send information or data to other devices, or to receive information or data sent by other devices.

[0328] The transceiver 3030 may include a transmitter and a receiver. The transceiver 3030 may further include an antenna, and the number of antennas may be one or more.

[0329] The communication device 3000 may specifically be a terminal in an embodiment of the present application, and the communication device 3000 may implement the corresponding processes implemented by the terminal in each method in the embodiment of the present application, which will not be described in detail here for the sake of brevity.

[0330] Figure 31 is a schematic structural diagram of a chip according to an embodiment of the present application. The chip 3100 shown in Figure 31 includes a processor 3110, which can call and run a computer program from a memory to implement the method according to the embodiment of the present application.

[0331] Optionally, as shown in FIG31 , the chip 3100 may further include a memory 3120. The processor 3110 may call and execute a computer program from the memory 3120 to implement the method in the embodiment of the present application.

[0332] The memory 3120 may be a separate device independent of the processor 3110 , or may be integrated into the processor 3110 .

[0333] Optionally, the chip 3100 may further include an input interface 3130. The processor 3110 may control the input interface 3130 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0334] Optionally, the chip 3100 may further include an output interface 3140. The processor 3110 may control the output interface 3140 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0335] The chip can be applied to the terminal in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the terminal in each method of the embodiment of the present application. For the sake of brevity, it will not be repeated here.

[0336] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0337] It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method embodiment can be completed by hardware integrated logic circuits in the processor or software instructions. The above processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The various methods, steps, and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0338] It is understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0339] It should be understood that the above-mentioned memories are exemplary but not restrictive. For example, the memories in the embodiments of the present application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM RAM (DR RAM), etc. In other words, the memories in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0340] The present application also provides a computer-readable storage medium for storing a computer program. This computer-readable storage medium can be applied to a terminal in the present application, and the computer program causes a computer to execute the corresponding processes implemented by the terminal in each method of the present application. For the sake of brevity, these are not further described here.

[0341] The present application also provides a computer program product including computer program instructions. This computer program product can be applied to a terminal in the present application, and the computer program instructions cause a computer to execute the corresponding processes implemented by the terminal in each method of the present application. For the sake of brevity, these instructions are not further described here.

[0342] The present application also provides a computer program. This computer program can be applied to the terminal in the present application. When the computer program is executed on a computer, it causes the computer to execute the corresponding process implemented by the terminal in each method of the present application. For the sake of brevity, it is not further described here.

[0343] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0344] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0345] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0346] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0347] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0348] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0349] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for controlling the transmission power of synchronization signals, which is applied to a terminal. The method includes: Performing channel access on at least one first resource block (RB) set; The channel access result of the at least one first RB set is used to determine the transmission power of the first sidelink synchronization signal block (S-SSB) on the at least one first RB set.

2. The method according to claim 1, wherein, Among the at least one first RB set, the sum of the transmission powers of the first S-SSB on the first RB sets with successful channel access results is the maximum available transmission power.

3. The method according to claim 2, wherein, The at least one first RB set includes an anchor RB set; The first RB sets with successful channel access results include the anchor RB set; Or, The first RB sets with successful channel access results do not include the anchor RB set.

4. The method according to claim 1, wherein, The at least one first RB set includes an anchor RB set; When the channel access result of the anchor RB set is a failure, the transmission power of the first S-SSB on the at least one first RB set is 0.

5. The method according to any one of claims 1 to 4, wherein, Before performing channel access on the at least one first RB set, the method further includes: Determining the transmission power of the second S-SSB on the at least one first RB set; the sum of the transmission powers of the second S-SSB on the at least one first RB set is the maximum available transmission power.

6. The method according to claim 5, wherein, When the channel access results of the at least one first RB set are all successful, the transmission power of the first S-SSB on each first RB set is the same as the transmission power of the second S-SSB on the first RB set.

7. The method according to claim 5, wherein, The at least one first RB set includes an anchor RB set; When the channel access result of the anchor RB set is successful, the transmission power of the first S-SSB on the anchor RB set may be the same as or different from the transmission power of the second S-SSB on the anchor RB set.

8. The method according to any one of claims 1 to 7, wherein, The at least one first RB set is the frequency domain resource determined before performing the channel access for transmitting S-SSB.

9. The method according to any one of claims 1 to 4, wherein, The method further includes: Obtaining the configuration information of the channel occupancy time (COT), and the configuration information of the COT is used to configure at least one second RB set included in the COT; Wherein, the at least one first RB set includes at least one third RB set and the at least one second RB set; the third RB set is the frequency domain resource determined before performing the channel access for transmitting S-SSB.

10. The method according to claim 9, wherein, The configuration information of the COT is determined by the terminal; or, The configuration information of the COT comes from other terminals.

11. The method according to claim 9 or 10, wherein, the at least one third RB set includes the at least one second RB set; or, the at least one third RB set does not include the at least one second RB set; or, there is a partially identical RB set between the at least one third RB set and the at least one second RB set.

12. The method according to any one of claims 9 to 11, wherein, the method further includes: when the process of channel access is not completed, determining the third S-SSB transmission power on the at least one first RB set; the sum of the third S-SSB transmission powers on the at least one first RB set is the maximum available transmission power.

13. The method according to claim 12, wherein, the at least one first RB set includes an anchor RB set; when the channel access result of the anchor RB set is successful, the first S-SSB transmission power on the anchor RB set is the same as or different from the third S-SSB transmission power on the anchor RB set.

14. The method according to any one of claims 9 to 11, wherein, before obtaining the configuration information of the COT, the method further includes: determining the fourth S-SSB transmission power on the at least one third RB set; the sum of the fourth S-SSB transmission powers on the at least one third RB set is the maximum available transmission power.

15. The method according to claim 14, wherein, the at least one third RB set includes an anchor RB set; when the channel access result of the anchor RB set is successful, the first S-SSB transmission power on the anchor RB set is the same as or different from the fourth S-SSB transmission power on the anchor RB set.

16. The method according to claim 14 or 15, wherein, the method further includes: when the process of channel access is not completed, determining the third S-SSB transmission power on the at least one first RB set; the sum of the third S-SSB transmission powers on the at least one first RB set is the maximum available transmission power.

17. The method according to claim 16, wherein, the at least one third RB set includes an anchor RB set; the third S-SSB transmission power on the anchor RB set is the same as or different from the fourth S-SSB transmission power on the anchor RB set; when the channel access result of the anchor RB set is successful, the first S-SSB transmission power on the anchor RB set is the same as or different from the third S-SSB transmission power on the anchor RB set.

18. The method according to any one of claims 1 to 17, wherein, the method further includes: for each first RB set in the at least one first RB set, when the first S-SSB transmission power on the first RB set is not 0, transmitting S-SSB on the first RB set based on the first S-SSB transmission power on the first RB set.

19. A synchronous signal transmission power control device, the device comprises: An execution unit configured to perform channel access on at least one first resource block (RB) set; The channel access result of the at least one first RB set is used to determine the transmission power of the first sidelink synchronization signal block (S-SSB) on the at least one first RB set.

20. The device according to claim 19, wherein, In the at least one first RB set, the sum of the transmission powers of the first S-SSBs on the first RB sets with successful channel access results is the maximum available transmission power.

21. The device according to claim 20, wherein, The at least one first RB set includes an anchor RB set; The first RB sets with successful channel access results include the anchor RB set; Or, The first RB sets with successful channel access results do not include the anchor RB set.

22. The device according to claim 19, wherein, The at least one first RB set includes an anchor RB set; When the channel access result of the anchor RB set is a failure, the transmission power of the first S-SSB on the at least one first RB set is 0.

23. The device according to any one of claims 19 to 22, wherein, The device further comprises: A first determination unit configured to determine the transmission power of the second S-SSB on the at least one first RB set before performing channel access on the at least one first RB set; the sum of the transmission powers of the second S-SSBs on the at least one first RB set is the maximum available transmission power.

24. The device according to claim 23, wherein, When the channel access results of the at least one first RB set are all successful, the transmission power of the first S-SSB on each first RB set is the same as the transmission power of the second S-SSB on the first RB set.

25. The device according to claim 23, wherein, The at least one first RB set includes an anchor RB set; When the channel access result of the anchor RB set is successful, the transmission power of the first S-SSB on the anchor RB set is the same as or different from the transmission power of the second S-SSB on the anchor RB set.

26. The device according to any one of claims 19 to 25, wherein, The at least one first RB set is the frequency domain resource determined for transmitting S-SSB before performing the channel access.

27. The device according to any one of claims 19 to 22, wherein, The device further comprises: An acquisition unit configured to acquire the configuration information of the channel occupancy time (COT), and the configuration information of the COT is used to configure at least one second RB set included in the COT; wherein, the at least one first RB set includes at least one third RB set and the at least one second RB set; the third RB set is the frequency domain resource determined for transmitting S-SSB before performing the channel access.

28. The device according to claim 27, wherein, The configuration information of the COT is determined by the device; or, The configuration information of the COT comes from other terminals.

29. The device according to claim 27 or 28, wherein, The at least one third RB set includes the at least one second RB set; or, The at least one third RB set does not include the at least one second RB set; Or, There is a partially identical RB set between the at least one third RB set and the at least one second RB set.

30. The device according to any one of claims 27 to 29, wherein, The device further includes: A second determination unit, configured to determine the transmission power of the third S-SSB on the at least one first RB set when the process of channel access is not completed; the sum of the transmission powers of the third S-SSB on the at least one first RB set is the maximum available transmission power.

31. The device according to claim 30, wherein, The at least one first RB set includes an anchor RB set; When the channel access result of the anchor RB set is successful, the transmission power of the first S-SSB on the anchor RB set is the same as or different from the transmission power of the third S-SSB on the anchor RB set.

32. The device according to any one of claims 27 to 29, wherein, The device further includes: A third determination unit, configured to determine the transmission power of the fourth S-SSB on the at least one third RB set before obtaining the configuration information of the COT; the sum of the transmission powers of the fourth S-SSB on the at least one third RB set is the maximum available transmission power.

33. The device according to claim 32, wherein, The at least one third RB set includes an anchor RB set; When the channel access result of the anchor RB set is successful, the transmission power of the first S-SSB on the anchor RB set is the same as or different from the transmission power of the fourth S-SSB on the anchor RB set.

34. The device according to claim 32 or 33, wherein, The device further includes: A fourth determination unit, configured to determine the transmission power of the third S-SSB on the at least one first RB set when the process of channel access is not completed; the sum of the transmission powers of the third S-SSB on the at least one first RB set is the maximum available transmission power.

35. The device according to claim 34, wherein, The at least one third RB set includes an anchor RB set; The transmission power of the third S-SSB on the anchor RB set is the same as or different from the transmission power of the fourth S-SSB on the anchor RB set; When the channel access result of the anchor RB set is successful, the transmission power of the first S-SSB on the anchor RB set is the same as or different from the transmission power of the third S-SSB on the anchor RB set.

36. The device according to any one of claims 19 to 35, wherein, The device further includes: A transmitting unit, configured to, for each of the at least one first RB set, when the transmission power of the first S-SSB on the first RB set is non-zero, transmit an S-SSB on the first RB set based on the transmission power of the first S-SSB on the first RB set.

37. A terminal, comprising: a processor and a memory, the memory for storing a computer program, the processor for calling and running the computer program stored in the memory to execute the method according to any one of claims 1 to 18.

38. A chip, comprising: a processor, for calling and running a computer program from a memory, such that a device installed with the chip executes the method according to any one of claims 1 to 18.

39. A computer-readable storage medium for storing a computer program, the computer program causing a computer to execute the method according to any one of claims 1 to 18.

40. A computer program product comprising computer program instructions, the computer program instructions causing a computer to execute the method according to any one of claims 1 to 18.

41. A computer program, the computer program causing a computer to execute the method according to any one of claims 1 to 18.

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