Reference signal indication method and device, communication device and storage medium

Abstract

The invention relates to a reference signal indication method and device, a communication device and a storage medium. In at least one embodiment of the present disclosure, a sending end sends direct link control information SCI, the SCI carries indication information of a channel state information reference signal CSI-RS, the indication information is used for indicating a time-frequency resource occupied by the CSI-RS, and then the CSI-RS used for beam scanning is sent on the time-frequency resource indicated by the indication information of the CSI-RS. According to the embodiment of the invention, the receiving end can know the receiving time-frequency resource position of the CSI-RS after decoding the SCI, so that the received CSI-RS is utilized to execute the beam scanning process, and therefore, the CSI-RS for beam scanning can be used without being established after the unicast link of the straight-through link SL, and the method is suitable for a scene in which the unicast link establishment of the SL and the beam scanning are performed at the same time.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the field of communication technologies, and in particular to a reference signal indication method, device, communication device, and storage medium. Background Art

[0002] Simultaneously establishing a unicast link for a sidelink (SL) and performing beam scanning allows for the integration of beam scanning into SL technology. However, in scenarios where SL unicast link establishment and beam scanning are performed simultaneously, existing reference signals cannot be used for beam scanning because they are only usable after the SL unicast link is established. Therefore, there is an urgent need to provide a reference signal indication solution that is applicable to the beam scanning process in scenarios where SL unicast link establishment and beam scanning are performed simultaneously. Summary of the Invention

[0003] At least one embodiment of the present disclosure provides a reference signal indication method, apparatus, communication device, and storage medium.

[0004] In a first aspect, an embodiment of the present disclosure provides a reference signal indication method, applied to a transmitting end, the method comprising:

[0005] The transmitting end sends direct link control information SCI, wherein the SCI carries indication information of a channel state information reference signal CSI-RS, and the indication information is used to indicate the time-frequency resources occupied by the CSI-RS;

[0006] The transmitting end sends CSI-RS on time-frequency resources, where the CSI-RS or SCI carries beam scanning related information.

[0007] In some embodiments, the SCI is a two-stage SCI, the two-stage SCI including a first-order SCI and a second-order SCI;

[0008] The two-level SCI carries CSI-RS indication information, including:

[0009] In the first-order SCI, a domain is extended, and the indication information of the CSI-RS is carried in the extended domain;

[0010] Alternatively, the CSI-RS indication information is carried in the second-order SCI redundancy field.

[0011] In some embodiments, the SCI is a single-stage dedicated SCI;

[0012] The beam scanning related information is carried in the single-stage dedicated SCI.

[0013] In some embodiments, each orthogonal frequency division multiplexing OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by a CSI-RS.

[0014] In some embodiments, the SCI also carries a time window, which is used by the receiving end to select different methods to trigger the transmission of the CSI-RS.

[0015] In some embodiments, the CSI-RS is an aperiodic CSI-RS or a periodic CSI-RS;

[0016] If the CSI-RS is a periodic CSI-RS, the transmitter stops sending the SCI after sending the SCI for the first time.

[0017] In some embodiments, if the CSI-RS is a periodic CSI-RS, the transmitting end transmits multiple directional beams in one time slot, and each directional beam occupies three OFDM symbols in one time slot;

[0018] Among them, three OFDM symbols are occupied by two consecutive demodulation reference signals DM-RS and one PSSCH, or by one DM-RS and two consecutive PSSCHs;

[0019] Among them, DM-RS carries SCI, and PSSCH carries CSI-RS.

[0020] In some embodiments, the first DM-RS of two consecutive DM-RSs or the first CSI-RS of two consecutive CSI-RSs is used for automatic gain control;

[0021] Alternatively, the transmitting end transmits each OFDM symbol in a time slot separately by a beam, and the maximum transmit power of each OFDM symbol is less than or equal to a preset maximum transmit power threshold.

[0022] In some embodiments, the reference signal indication method further includes:

[0023] If the beam scanning related information is carried in the DM-RS, the SCI also carries indication information of the beam scanning related information, and the indication information is used to indicate the OFDM symbol occupied by the DM-RS carrying the beam scanning related information.

[0024] In some embodiments, the SCI is a two-stage SCI, the two-stage SCI including a first-order SCI and a second-order SCI;

[0025] The two-level SCI carries the following information:

[0026] An extended field is provided in the first-order SCI, and indication information of beam scanning related information is carried in the extended field;

[0027] Alternatively, the indication information of the beam scanning related information is carried in the second-order SCI redundancy field.

[0028] In some embodiments, the SCI is a single-stage dedicated SCI;

[0029] Carrying beam scanning related information in a single-stage dedicated SCI;

[0030] Each OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by a DM-RS.

[0031] In some embodiments, if the DM-RS carrying beam scanning related information is a periodic DM-RS, the transmitting end stops sending the SCI after sending the SCI for the first time.

[0032] In some embodiments, if the DM-RS carrying beam scanning related information is a periodic DM-RS, the transmitting end transmits multiple directional beams in one time slot, and each directional beam occupies two OFDM symbols in one time slot;

[0033] Two OFDM symbols are occupied by two consecutive DM-RSs; the DM-RSs carry the SCI and bear the CSI-RS.

[0034] In some embodiments, if a time slot does not carry a physical direct link feedback channel PSFCH, the symbols occupied by two guard time slots GP and two symbols occupied by PSFCH in the time slot are occupied by DM-RS.

[0035] In a second aspect, an embodiment of the present disclosure further provides a reference signal indication device, applied to a transmitting end, the device comprising:

[0036] The first unit is configured to send direct link control information SCI, wherein the SCI carries indication information of a channel state information reference signal CSI-RS, and the indication information is used to indicate the time-frequency resources occupied by the CSI-RS;

[0037] The second unit is configured to send a CSI-RS on time-frequency resources, where the CSI-RS or SCI carries beam scanning related information.

[0038] In a third aspect, an embodiment of the present disclosure further provides a communication device, which includes a memory, a transceiver, and a processor;

[0039] A memory for storing computer programs; a transceiver for transmitting and receiving data under the control of a processor; and a processor for reading the computer programs in the memory and executing:

[0040] Sending direct link control information SCI, where the SCI carries indication information of a channel state information reference signal CSI-RS, and the indication information is used to indicate the time-frequency resources occupied by the CSI-RS;

[0041] The CSI-RS is sent on the time-frequency resources, wherein the CSI-RS or SCI carries beam scanning related information.

[0042] In some embodiments, the SCI is a two-stage SCI, the two-stage SCI including a first-order SCI and a second-order SCI;

[0043] The two-level SCI carries CSI-RS indication information, including:

[0044] In the first-order SCI, a domain is extended, and the indication information of the CSI-RS is carried in the extended domain;

[0045] Alternatively, the CSI-RS indication information is carried in the second-order SCI redundancy field.

[0046] In some embodiments, the SCI is a single-stage dedicated SCI;

[0047] The beam scanning related information is carried in the single-stage dedicated SCI.

[0048] In some embodiments, each orthogonal frequency division multiplexing OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by a CSI-RS.

[0049] In some embodiments, the SCI also carries a time window, which is used by the receiving end to select different methods to trigger the transmission of the CSI-RS.

[0050] In some embodiments, the CSI-RS is an aperiodic CSI-RS or a periodic CSI-RS;

[0051] If the CSI-RS is a periodic CSI-RS, the SCI is stopped from being sent after the SCI is sent for the first time.

[0052] In some embodiments, if the CSI-RS is a periodic CSI-RS, multiple directional beams are transmitted in one time slot, and each directional beam occupies three OFDM symbols in one time slot;

[0053] Among them, three OFDM symbols are occupied by two consecutive demodulation reference signals DM-RS and one PSSCH, or by one DM-RS and two consecutive PSSCHs;

[0054] Among them, DM-RS carries SCI, and PSSCH carries CSI-RS.

[0055] In some embodiments, the first DM-RS of two consecutive DM-RSs or the first CSI-RS of two consecutive CSI-RSs is used for automatic gain control;

[0056] Alternatively, each OFDM symbol in a time slot is transmitted separately by a beam, and the maximum transmit power of each OFDM symbol is less than or equal to a preset maximum transmit power threshold.

[0057] In some embodiments, the processor is further configured to:

[0058] If the beam scanning related information is carried in the DM-RS, the SCI also carries indication information of the beam scanning related information, and the indication information is used to indicate the OFDM symbol occupied by the DM-RS carrying the beam scanning related information.

[0059] In some embodiments, the SCI is a two-stage SCI, the two-stage SCI including a first-order SCI and a second-order SCI;

[0060] The two-level SCI carries the following information:

[0061] An extended field is provided in the first-order SCI, and indication information of beam scanning related information is carried in the extended field;

[0062] Alternatively, the indication information of the beam scanning related information is carried in the second-order SCI redundancy field.

[0063] In some embodiments, the SCI is a single-stage dedicated SCI;

[0064] Carrying beam scanning related information in a single-stage dedicated SCI;

[0065] Each OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by a DM-RS.

[0066] In some embodiments, if the DM-RS carrying the beam scanning related information is a periodic DM-RS, after the SCI is sent for the first time, the SCI is stopped from being sent.

[0067] In some embodiments, if the DM-RS carrying beam scanning related information is a periodic DM-RS, multiple directional beams are transmitted in one time slot, and each directional beam occupies two OFDM symbols of one time slot;

[0068] Two OFDM symbols are occupied by two consecutive DM-RSs; the DM-RSs carry the SCI and bear the CSI-RS.

[0069] In some embodiments, if a time slot does not carry a physical direct link feedback channel PSFCH, the symbols occupied by two guard time slots GP and two symbols occupied by PSFCH in the time slot are occupied by DM-RS.

[0070] In a fourth aspect, an embodiment of the present disclosure further proposes a processor-readable storage medium, which stores a program, and the program is used to enable a processor to execute the reference signal indication method of any embodiment of the first aspect.

[0071] In at least one embodiment of the present disclosure, the transmitting end sends direct link control information SCI, and carries indication information of the channel state information reference signal CSI-RS in the SCI, where the indication information is used to indicate the time-frequency resources occupied by the CSI-RS. The CSI-RS for beam scanning is then sent on the time-frequency resources indicated by the indication information of the CSI-RS, so that the receiving end can know the receiving time-frequency resource position of the CSI-RS after decoding the SCI, and thus perform the beam scanning process using the received CSI-RS. It can be seen that the CSI-RS used for beam scanning does not need to be used after the unicast link of the direct link SL is established, and is suitable for scenarios where the unicast link establishment of the SL and beam scanning are performed simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure, and a person skilled in the art can also obtain other drawings based on these drawings.

[0073] Figure 1 A flowchart of a reference signal indication method provided by an embodiment of the present disclosure;

[0074] Figure 2 A schematic diagram of an indication method of an aperiodic CSI-RS provided in an embodiment of the present disclosure;

[0075] Figure 3 A schematic diagram of an indication method of an aperiodic CSI-RS provided in an embodiment of the present disclosure;

[0076] Figure 4 A schematic diagram of a periodic CSI-RS indication method provided in an embodiment of the present disclosure;

[0077] Figure 5 A schematic diagram of an indication method of an aperiodic DM-RS provided in an embodiment of the present disclosure;

[0078] Figure 6A schematic diagram of a periodic DM-RS indication method provided in an embodiment of the present disclosure;

[0079] Figure 7 A schematic diagram of a reference signal indicating device provided in an embodiment of the present disclosure;

[0080] Figure 8 A schematic diagram of a communication device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0081] In order to more clearly understand the above-mentioned purposes, features and advantages of the present disclosure, the present disclosure is further described in detail below with reference to the accompanying drawings and examples. It will be understood that the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. The specific embodiments described herein are merely used to explain the present disclosure, rather than to limit the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art are within the scope of protection of the present disclosure.

[0082] It should be noted that, in this document, relational terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0083] Current SideLink (SL) technology primarily focuses on low-frequency bands. Because these bands offer reduced beam attenuation and enhanced anti-interference capabilities, terminals use omnidirectional antennas for communication. The 5G communication standard defines the FR2 frequency band (24.25 GHz to 52.6 GHz). SL communication in this band faces greater beam attenuation, requiring terminals to increase their transmit power. Beamforming, which focuses terminal power in a specific direction, can significantly improve transmit power, making its integration into SL technology an important research area.

[0084] SL unicast link establishment is primarily based on the establishment of a Radio Resource Control (RRC) connection over the PC5 interface. Beam scanning is a necessary step for beamforming. Therefore, to incorporate beamforming into SL technology, the order of beam scanning and SL unicast link establishment must be determined. Possible solutions include the following:

[0085] 1. Beam scanning occurs before the unicast link of the SL is established (before case);

[0086] 2. Beam scanning and SL unicast link establishment are performed simultaneously (during case);

[0087] 3. Beam scanning occurs after the unicast link of the SL is established (after case).

[0088] Among them, the solution of performing beam scanning and SL unicast link establishment simultaneously (during case) can effectively shorten the terminal program execution time and obtain time gain, but it will pay a higher frequency domain resource cost.

[0089] Directly combining existing beam scanning with SL unicast link establishment and performing them simultaneously will lead to incompatibility issues. For example, beam scanning requires directional antennas to transmit beams in different directions at different times, while existing SL unicast links rely on omnidirectional antennas. For another example, the traditional SL CSI-RS (Channel State Information-Reference Signal) resource is configured by PC5-RRC and is only available after unicast is established.

[0090] In summary, to ensure that beam scanning and SL unicast link establishment are carried out simultaneously (during the case), both processes need to be modified. Since the SL unicast link establishment process is mature, considering the forward compatibility of terminal design, the unicast link should be modified as little as possible. Therefore, the main consideration is to modify beam scanning to adapt to the existing unicast link establishment process.

[0091] At present, the beam scanning process uses CSI-RS as a reference signal, but DM-RS (De-Modulation-Reference Signal) is also included in the discussion scope in SL technology. Therefore, the present disclosure considers transmitting reference signals (such as SL CSI-RS or PSCCH (Physical Sidelink Control Channel) / PSSCH (Physical Sidelink Shared Channel) DM-RS together with the unicast link establishment message for initial beam pairing. According to the beam maintenance procedure of the Uu interface, beam scanning can be achieved by sending non-independent SL CSI-RS, and DCR (Direction Communication Request, used to establish a direct communication request for a unicast link) is transmitted in PSSCH. However, traditional SL CSI-RS resources are configured by PC5-RRC and can only be used after the unicast link of SL is established. Therefore, there is an urgent need for a new method for configuring and reporting reference signals and resources, such as (pre-)configured resources for initial beam pairing. In addition, there are also problems with the dynamic selection of transmission resources using independent SL CSI-RS. That is, in the absence of (pre-)configured resources, the RX (Receive) terminal may not know when and where to receive the signal. The reference signal needs to be redesigned to avoid the above problem.

[0092] For PSCCH / PSSCH DM-RS, DM-RS is designed for data demodulation, and the use of DM-RS for beam scanning and beam reporting is not defined in Uu. To achieve data demodulation, DM-RS requires higher measurement accuracy than CSI-RS and consumes more resources. The existing DM-RS design is not suitable for beam scanning.

[0093] To summarize, the problem with CSI-RS is that it requires independent and periodic transmission, or the ability to stably trigger aperiodic CSI-RS so that the RX terminal can receive signals without pre-configuration. The problem with DM-RS is that it has high resource requirements and the existing format is not suitable for beam scanning.

[0094] Disadvantages of existing solutions:

[0095] 1. Traditional SL CSI-RS resources are configured by PC5-RRC and can only be used after the SL unicast link is established. This cannot meet the performance requirements of simultaneous beam scanning and SL unicast link establishment (during the case);

[0096] 2. Existing reference signals cannot meet the following requirements: independent and periodic transmission or stable triggered aperiodic transmission, so that RX terminals can receive signals without pre-configuration;

[0097] 3. The existing DM-RS design is not suitable for beam scanning.

[0098] The present disclosure aims to design a new SL CSI-RS and SL DM-RS reference signal indication method to meet the performance requirements of simultaneous beam scanning and SL unicast link establishment (during case).

[0099] At least one embodiment of the present disclosure provides a reference signal indication method, device, communication device or storage medium, wherein the transmitting end carries the indication information of the channel state information reference signal CSI-RS in the direct link control information SCI, and the indication information is used to indicate the time-frequency resources occupied by the CSI-RS, and then sends the CSI-RS for beam scanning on the time-frequency resources indicated by the indication information of the CSI-RS, so that the receiving end can know the receiving time-frequency resource position of the CSI-RS after decoding the SCI, and thus use the received CSI-RS to perform the beam scanning process. It can be seen that the CSI-RS used for beam scanning does not need to be used after the unicast link of the direct link SL is established, and is suitable for scenarios where the unicast link establishment of the SL and beam scanning are performed simultaneously.

[0100] Figure 1 This is a flow chart of a reference signal indication method provided by an embodiment of the present disclosure, which is applied to a transmitting end. Figure 1 As shown, the reference signal indication method may include but is not limited to step 101 and step 102:

[0101] In step 101, the transmitting end sends direct link control information SCI, wherein the SCI carries indication information of a channel state information reference signal CSI-RS, and the indication information is used to indicate the time-frequency resources occupied by the CSI-RS.

[0102] In this embodiment, considering that if a non-periodic CSI-RS is used for beam scanning, one problem is that for the receiving end (such as the RX terminal), it is impossible to know in which resource set the CSI-RS should be received. To solve this problem, in this embodiment, the transmitting end uses direct link control information (Sidelink Control Information, SCI) to indicate the non-periodic CSI-RS (i.e., CSI-RS resource set), and the SCI carries the indication information of the Channel State Information-Reference Signal (CSI-RS), which is used to indicate the time-frequency resources occupied by the CSI-RS. This allows the receiving end to know which time-frequency resource position in which resource set the Channel State Information Reference Signal CSI-RS is received by parsing the indication information carried in the direct link control information SCI without pre-configuration.

[0103] Aperiodic CSI-RS

[0104] For aperiodic CSI-RS, the direct link control information (SCI) can be a two-level SCI, which includes a first-order SCI and a second-order SCI. The existing first-order SCI may not have enough redundant bits to carry the indication information of the channel state information reference signal (CSI-RS), while the second-order SCI may have redundant bits. Therefore, there are two ways to carry the indication information of the CSI-RS in the two-level SCI:

[0105] Method 1: Extend the domain in the first-order SCI, and carry the indication information of the CSI-RS in the extended domain.

[0106] Method 2: Carrying CSI-RS indication information in the second-order SCI redundancy domain.

[0107] For example, Figure 2 A schematic diagram of an indication method of a non-periodic CSI-RS provided in an embodiment of the present disclosure, Figure 2 In the figure, 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols are shown, numbered 0 to 13, transmitted in a time slot. Symbol 0 is used for Automatic Gain Control (AGC). The height of each symbol represents the frequency domain range occupied by the symbol (i.e., the occupied frequency domain resources). The physical direct link control channel PSCCH occupies part of the frequency domain resources of symbols 1 to 3. When the PSCCH transmits the first-order SCI, Figure 2The time-frequency resources occupied by the first-order SCI are only for reference and do not represent the actual time-frequency resources. The second-order SCI occupies part of the time-frequency resources of symbol 4 and symbol 5. Figure 2 The time-frequency resources occupied by the second-order SCI are for reference only and do not represent the actual time-frequency resources. The time-frequency resources occupied by the second-order SCI are indicated in the first-order SCI. The indication information of the CSI-RS is carried in the extended domain of the first-order SCI, or the indication information of the CSI-RS is carried in the redundant domain of the second-order SCI, wherein the indication information of the CSI-RS indicates that the CSI-RS occupies part of the time-frequency resources of symbol 6. In addition, in each CSI-RS resource set, Quasi Co-Location (QCL) or beam is configured as part of the non-periodic CSI-RS triggering, and the QCL type can include QCL type A and QCL type D.

[0108] In some embodiments, for non-periodic CSI-RS, the direct link control information SCI is a single-stage dedicated SCI (denoted as SCI format 1-C). Therefore, the single-stage dedicated SCI carries beam scanning related information and does not carry other information. That is, the single-stage dedicated SCI specifically carries beam scanning related information and is only used to transmit beam scanning related information. Figure 2 In comparison, each OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by a CSI-RS, and the CSI-RS is used for beam scanning.

[0109] For example, Figure 3 A schematic diagram of an indication method of a non-periodic CSI-RS provided in an embodiment of the present disclosure, Figure 3 In the figure, 14 OFDM symbols are shown for one time slot transmission, and Figure 2 The difference is that Figure 2 The symbols occupied by PSSCH are all occupied by CSI-RS. The single-stage dedicated SCI occupies part of the frequency domain resources from symbols 1 to 3. Figure 3 The time-frequency resources occupied by the single-level dedicated SCI are for reference only and do not represent the actual time-frequency resources.

[0110] In step 102, the transmitting end transmits a CSI-RS on the time-frequency resources occupied by the CSI-RS, wherein the CSI-RS or SCI carries beam scanning related information.

[0111] In this embodiment, if the two-level SCI carries the indication information of CSI-RS, the transmitting end sends CSI-RS after sending the second-level SCI. Figure 2 In the example, the transmitter sends CSI-RS at symbol 6 to ensure that CSI-RS is sent after the second-order SCI.

[0112] After receiving the first-order SCI and the second-order SCI, the receiving end (e.g., the RX terminal) decodes the first-order SCI and the second-order SCI to obtain the indication information of the CSI-RS (the indication information may be in the first-order SCI or the second-order SCI), and then determines the receiving time-frequency position of the CSI-RS based on the indication information of the CSI-RS, thereby receiving the CSI-RS at the receiving time-frequency position, decoding the received CSI-RS, and performing preset processes such as reference signal receiving power (RSRP) measurement.

[0113] In some embodiments, a time window (time offset) exists between the time a receiver receives direct link control information (SCI) and the time it transmits aperiodic CSI-RS. Therefore, in this embodiment, the SCI also carries the time window, which is used by the receiver to select different methods for triggering CSI-RS transmission. The value of the time window is indicated by the SCI and can be any value between 1 and 32 time slots.

[0114] For example, if the time offset is greater than or equal to the beam switching delay (beamSwitchTiming), it indicates that the receiving end has sufficient time to determine the feedback beam and feedback information. Then, the receiving end triggers the transmission of the aperiodic CSI-RS according to the QCL / beam of the received SLCSI-RS according to the trigger state configuration.

[0115] For another example, if the time offset is less than the beam switching delay, indicating that the receiving end cannot determine the feedback beam and feedback information in real time based on the received SCI and SL CSI-RS, the receiving end will trigger the non-periodic CSI-RS based on the default QCL / beam, for example, only considering the beam reciprocity to determine the feedback beam.

[0116] It should be noted that for the receiving end, if multiple different beams need to be measured, the non-periodic CSI-RS used for beam measurement must be cross-triggered. This is because the receiving end may not be able to simultaneously receive and decode the SCI of multiple time-frequency resources, and due to the limitations of directional antennas, the receiving end is unable to simultaneously send different beams to carry non-periodic CSI-RS.

[0117] In scenarios with multiple transmitters, the receiver may receive beam scanning reference signals from multiple transmitters simultaneously. The receiver's feedback timing is typically transmitted by the transmitter in the SCI or SL CSI-RS. If the feedback timings of multiple transmitters overlap, the receiver cannot provide feedback simultaneously. Therefore, the system requires that the transmitter's aperiodic CSI-RS reference signal transmission timing and triggering feedback timing be interleaved.

[0118] It should be noted that, considering that in the existing SL signal design, PSCCH is only transmitted in the first four symbols, it cannot meet the transmission and triggering of different beams in one time slot. If the PSCCH is modified, it will lead to major standard changes and cannot meet the forward compatibility requirements. Therefore, in this embodiment, the non-periodic CSI-RS design does not support the transmission of multiple beams in one time slot.

[0119] The above embodiments are described by taking the aperiodic CSI-RS as an example, and the following description is given by taking the periodic CSI-RS as an example.

[0120] Periodic CSI-RS

[0121] If the CSI-RS is periodic, the transmitter stops sending SCI after the first transmission of the direct link control information (SCI). The main advantage of periodic CSI-RS is that after the first SCI is sent to indicate the SL CSI-RS resource set, no further SCI indication is required until the beam scan is completed, thereby reducing SCI resource usage.

[0122] During the transmission of periodic CSI-RS, the transmitter triggers the periodic CSI-RS only when the SCI is sent for the first time, and there is no need to send SCI again. Similarly, the Quasi Co-Location (QCL) reference signal between different antenna ports can be used to assist in configuring parameters or to rely on beam reciprocity to determine some parameters. After receiving and decoding the SCI, the receiver can understand the time-frequency resource location of all subsequent CSI-RS until the beam scan ends or a new SCI is received again. Among them, some parameters include, but are not limited to, at least one of the following:

[0123] Various QCL types include transmission parameters such as Doppler shift, Doppler spread, average delay, delay spread, and spatial RX parameters. They also include information such as the transmitter identifier and beam identifier, as well as the optimal feedback timing for the receiver. It should be noted that these parameters can be included in beam scanning information.

[0124] Compared to aperiodic CSI-RS, periodic CSI-RS does not require triggering time. When different transmitters trigger CSI-RS simultaneously, the receiver can provide CSI-RS feedback within any periodic feedback window. There is a maximum feedback time, after which beam scanning is considered invalid.

[0125] In some embodiments, for periodic CSI-RS, the transmitter transmits multiple directional beams in one time slot, and each directional beam occupies three OFDM symbols in one time slot; wherein, the three OFDM symbols are occupied by two consecutive demodulation reference signals DM-RS and one PSSCH, or by one DM-RS and two consecutive PSSCHs; wherein, the DM-RS carries SCI, and the PSSCH carries CSI-RS.

[0126] The transmitter transmits multiple directional beams within a time slot, requiring the automatic gain control (AGC) problem to be addressed. This AGC problem occurs when power jumps between consecutive symbols may exceed the linear measurement range of the receiver hardware, resulting in signal reception failure. There are two ways to address this AGC problem:

[0127] Method 1: The first of two consecutive DM-RS symbols or the first of two consecutive CSI-RS symbols is used for automatic gain control. For example, two consecutive identical CSI-RS symbols can ensure that the receiver adjusts the measurement interval after measuring the power of the first symbol, thereby normally receiving the second symbol.

[0128] Method 2: Each OFDM symbol within a time slot is transmitted using a separate beam, and the maximum transmit power of each OFDM symbol is less than or equal to a preset maximum transmit power threshold. In other words, the maximum transmit power of each symbol is limited. For example, the maximum transmit power of each symbol on a beam is limited to ensure that the power does not exceed a certain range.

[0129] For example, Figure 4 A schematic diagram of a periodic CSI-RS indication method provided in an embodiment of the present disclosure is shown in FIG. Figure 4 As shown, two DM-RS symbols and one PSSCH symbol form a group and are carried by a beam. The SCI information is carried by the DM-RS symbol, and the two DM-RS symbols are repeated. The first DM-RS symbol (e.g., symbol 1) serves as the AGC symbol for automatic gain control. The periodic CSI-RS is carried by the PSSCH for beam scanning, while the design of other symbols remains unchanged. Three beams in different directions can be transmitted within a time slot.

[0130] After the receiving end receives the transmit beam from the transmitting end (the beam may only contain three OFDM symbols, but still occupies the time resource of a time slot), the receiving end decodes the SCI to obtain the periodic SL CSI-RS resource set, thereby obtaining the QCL reference signal auxiliary configuration parameters. The receiving end will also follow Figure 4 The CSI-RS resource of the beam is fed back in the format. In the subsequent resource transmission, there is no need to carry the SCI resource until the beam scanning is completed or the beam switching occurs.

[0131] It can be seen that in Figure 4 In DM-RS, when the transmitter transmits multiple beams within a time slot, the periodic CSI-RS transmission signal consists of only three OFDM symbols and does not include the PSCCH. Therefore, triggering relies primarily on the SCI carried in the DM-RS. This SCI information includes the CSI-RS time-frequency resource location and period. The receiver decodes the SCI to obtain all CSI-RS time-frequency resources. The transmitter can transmit multiple beams within a time slot, improving beam scanning efficiency.

[0132] DM-RS format design in SL

[0133] If the beam scanning related information is carried in the DM-RS, the direct link control information SCI also carries indication information of the beam scanning related information, which is used to indicate the OFDM symbols occupied by the DM-RS carrying the beam scanning related information.

[0134] Because DM-RS is transmitted in fixed symbols within a time slot, it can be considered either a periodic CSI-RS or an aperiodic CSI-RS, depending on the configuration in the direct link control information (SCI). The transmitter can use an SCI to trigger an aperiodic DM-RS, or it can trigger a periodic DM-RS only during the first (or periodic) transmission. Aperiodic DM-RS is aperiodic for the receiver, meaning that the DM-RS carrying beam scanning-related information (Msg) is an aperiodic DM-RS.

[0135] Aperiodic DM-RS

[0136] When an aperiodic DM-RS is used as an aperiodic beam scanning reference signal, the direct link control information (SCI) may be a two-level SCI, comprising a first-order SCI and a second-order SCI. The two-level SCI may carry the indication information related to beam scanning in the two-level SCI in the following two ways:

[0137] Method 1: Extend the field in the first-order SCI, and carry indication information related to beam scanning in the extended field.

[0138] Method 2: The beam scanning related information is carried in the second-order SCI redundant field.

[0139] For example, Figure 5 A schematic diagram of an indication method of a non-periodic DM-RS provided in an embodiment of the present disclosure. Figure 5 In the , the physical direct link control channel PSCCH occupies part of the frequency domain resources of symbols 1 to 3, and the first-order SCI is transmitted in the PSCCH. The second-order SCI occupies part of the time-frequency resources of symbols 4 and 5. The first-order SCI will indicate the time-frequency resources occupied by the second-order SCI. The indication information of the beam scanning related information (Msg) is carried in the extended domain of the first-order SCI, or the indication information of the Msg is carried in the redundant domain of the second-order SCI, wherein the indication information of the Msg indicates that the Msg occupies part of the time-frequency resources of symbol 7, and the Msg is carried by the DM-RS transmitted in symbol 7. Figure 5 In the DM-RS, the transmitter sends the DM-RS carrying the Msg in symbol 7, ensuring that the DM-RS carrying the Msg is sent after the second-order SCI. It should be noted that in each DM-RS resource set that carries beam scanning related information (Mg), there are Quasi Co-Location (QCL) or beam configuration parameters.

[0140] In some embodiments, for non-periodic DM-RS, the direct link control information SCI may be a single-stage dedicated SCI. Therefore, the single-stage dedicated SCI carries beam scanning related information (Msg) and does not carry other information. That is, the single-stage dedicated SCI specifically carries beam scanning related information (Msg), and the single-stage dedicated SCI is only used to transmit beam scanning related information. Figure 5 In the transmission time slot of the single-stage dedicated SCI, each OFDM symbol occupied by the physical direct link shared channel PSSCH is occupied by a DM-RS, the DM-RS is used for beam scanning, and symbols 10 to 12 are also occupied by the DM-RS.

[0141] Periodic DM-RS

[0142] The DM-RS carrying beam scanning related information (Mg) can be transmitted periodically. During the periodic DM-RS transmission process, the transmitter stops sending the direct link control information SCI after the first transmission. That is, the transmitter does not need to send SCI again after sending SCI to trigger the periodic DM-RS for the first time. Similarly, the Quasi Co-Location (QCL) reference signal between different antenna ports can be used to assist in configuring parameters or to rely on beam reciprocity to determine some parameters (this belongs to the existing technology and will not be repeated here). After receiving and decoding the SCI, the receiving end can understand the time-frequency resource location of all subsequent DM-RS until the beam scanning ends or a new SCI is received again.

[0143] In some embodiments, if the DM-RS carrying beam scanning information is a periodic DM-RS, the transmitter transmits multiple directional beams in a time slot, with each directional beam occupying two OFDM symbols in a time slot. Two consecutive DM-RSs occupy two OFDM symbols, and the DM-RSs carry the SCI and bear the CSI-RS.

[0144] For example, Figure 6 A schematic diagram of a periodic DM-RS indication method provided in an embodiment of the present disclosure. Figure 6 In , when the transmitter transmits multiple directional beams in one time slot, each directional beam requires two DM-RS symbols that are consecutive in the time domain, and the first DM-RS symbol is used for automatic gain control (AGC). Figure 6 In , one time slot can carry 5 groups of DM-RS resources, which are allocated to 5 different beams. Figure 6 In the example, if a time slot does not carry the physical direct link feedback channel (PSFCH), the symbols occupied by the two protection time slots GP and the two symbols occupied by PSFCH in the time slot are occupied by DM-RS, that is, 7 different beams can be transmitted in one time slot.

[0145] Compared to periodic CSI-RS (e.g. Figure 4 shown), Figure 6 The periodic DM-RS shown in the figure only occupies 2 symbols per beam, which increases the beam scanning efficiency.

[0146] In summary, the reference signal used for beam scanning can be transmitted independently and periodically, or can be stably triggered non-periodically, so that the receiving end can receive the reference signal without pre-configuration.

[0147] It should be noted that for the aforementioned method embodiments, for simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art will understand that the embodiments of the present disclosure are not limited by the order of the actions described, because according to the embodiments of the present disclosure, certain steps can be performed in other orders or simultaneously. In addition, those skilled in the art will understand that the embodiments described in the specification are all optional embodiments.

[0148] Figure 7 A schematic diagram of a reference signal indication device provided in an embodiment of the present disclosure, wherein the reference signal indication device is applied to a transmitting end, such as Figure 7 As shown, the reference signal indicating device includes but is not limited to: a first unit 71 and a second unit 72, which are specifically described as follows:

[0149] The first unit 71 is configured to send direct link control information SCI, where the SCI carries indication information of a channel state information reference signal CSI-RS, and the indication information is used to indicate the time-frequency resources occupied by the CSI-RS;

[0150] The second unit 72 is configured to send a CSI-RS on time-frequency resources, where the CSI-RS or SCI carries beam scanning related information.

[0151] In some embodiments, the SCI is a two-stage SCI, the two-stage SCI including a first-order SCI and a second-order SCI;

[0152] The two-level SCI carries CSI-RS indication information, including:

[0153] In the first-order SCI, a domain is extended, and the indication information of the CSI-RS is carried in the extended domain;

[0154] Alternatively, the CSI-RS indication information is carried in the second-order SCI redundancy field.

[0155] In some embodiments, the SCI is a single-stage dedicated SCI;

[0156] The beam scanning related information is carried in the single-stage dedicated SCI.

[0157] In some embodiments, each orthogonal frequency division multiplexing OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by a CSI-RS.

[0158] In some embodiments, the SCI also carries a time window, which is used by the receiving end to select different methods to trigger the transmission of the CSI-RS.

[0159] In some embodiments, the CSI-RS is an aperiodic CSI-RS or a periodic CSI-RS;

[0160] If the CSI-RS is a periodic CSI-RS, the first unit 71 stops sending the SCI after sending the SCI for the first time.

[0161] In some embodiments, if the CSI-RS is a periodic CSI-RS, the second unit 72 transmits multiple directional beams in one time slot, and each directional beam occupies three OFDM symbols in one time slot;

[0162] Among them, three OFDM symbols are occupied by two consecutive demodulation reference signals DM-RS and one PSSCH, or by one DM-RS and two consecutive PSSCHs;

[0163] Among them, DM-RS carries SCI, and PSSCH carries CSI-RS.

[0164] In some embodiments, the first DM-RS of two consecutive DM-RSs or the first CSI-RS of two consecutive CSI-RSs is used for automatic gain control;

[0165] Alternatively, the second unit 72 transmits each OFDM symbol in a time slot using a separate beam, and the maximum transmit power of each OFDM symbol is less than or equal to a preset maximum transmit power threshold.

[0166] In some embodiments, if the beam scanning related information is carried in the DM-RS, the SCI also carries indication information of the beam scanning related information, and the indication information is used to indicate the OFDM symbol occupied by the DM-RS carrying the beam scanning related information.

[0167] In some embodiments, the SCI is a two-stage SCI, the two-stage SCI including a first-order SCI and a second-order SCI;

[0168] The two-level SCI carries the following information:

[0169] An extended field is provided in the first-order SCI, and indication information of beam scanning related information is carried in the extended field;

[0170] Alternatively, the indication information of the beam scanning related information is carried in the second-order SCI redundancy field.

[0171] In some embodiments, the SCI is a single-stage dedicated SCI;

[0172] Carrying beam scanning related information in a single-stage dedicated SCI;

[0173] Each OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by a DM-RS.

[0174] In some embodiments, if the DM-RS carrying the beam scanning related information is a periodic DM-RS, the first unit 71 stops sending the SCI after sending the SCI for the first time.

[0175] In some embodiments, if the DM-RS carrying the beam scanning related information is a periodic DM-RS, the second unit 72 transmits multiple directional beams in one time slot, and each directional beam occupies two OFDM symbols of one time slot;

[0176] Two OFDM symbols are occupied by two consecutive DM-RSs; the DM-RSs carry the SCI and bear the CSI-RS.

[0177] In some embodiments, if a time slot does not carry a physical direct link feedback channel PSFCH, the symbols occupied by two guard time slots GP and two symbols occupied by PSFCH in the time slot are occupied by DM-RS.

[0178] Figure 7 For details of the various embodiments of the reference signal indicating device shown, please refer to Figure 1 To avoid repetition, the various embodiments of the reference signal indication method are not described again.

[0179] The present disclosure also provides a processor-readable storage medium storing a program for causing a processor to execute the steps of each embodiment of the reference signal indication method. The processor-readable storage medium can be any available medium or data storage device accessible by the processor, including but not limited to magnetic storage (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor storage (e.g., ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD), etc.).

[0180] Figure 8 A schematic diagram of a communication device provided in an embodiment of the present disclosure is shown in FIG. Figure 8 As shown, the communication device provided by the embodiment of the present disclosure includes a memory 81, a transceiver 82, and a processor 83:

[0181] The memory 81 is used to store computer programs; the transceiver 82 is used to send and receive data under the control of the processor 83; the processor 83 is used to read the computer program in the memory 81 and execute:

[0182] Sending direct link control information SCI, where the SCI carries indication information of a channel state information reference signal CSI-RS, and the indication information is used to indicate the time-frequency resources occupied by the CSI-RS;

[0183] The CSI-RS is sent on the time-frequency resources, wherein the CSI-RS or SCI carries beam scanning related information.

[0184] In some embodiments, the SCI is a two-stage SCI, the two-stage SCI including a first-order SCI and a second-order SCI;

[0185] The two-level SCI carries CSI-RS indication information, including:

[0186] In the first-order SCI, a domain is extended, and the indication information of the CSI-RS is carried in the extended domain;

[0187] Alternatively, the CSI-RS indication information is carried in the second-order SCI redundancy field.

[0188] In some embodiments, the SCI is a single-stage dedicated SCI;

[0189] The beam scanning related information is carried in the single-stage dedicated SCI.

[0190] In some embodiments, each orthogonal frequency division multiplexing OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by a CSI-RS.

[0191] In some embodiments, the SCI also carries a time window, which is used by the receiving end to select different methods to trigger the transmission of the CSI-RS.

[0192] In some embodiments, the CSI-RS is an aperiodic CSI-RS or a periodic CSI-RS;

[0193] If the CSI-RS is a periodic CSI-RS, the SCI is stopped from being sent after the SCI is sent for the first time.

[0194] In some embodiments, if the CSI-RS is a periodic CSI-RS, multiple directional beams are transmitted in one time slot, and each directional beam occupies three OFDM symbols in one time slot;

[0195] Among them, three OFDM symbols are occupied by two consecutive demodulation reference signals DM-RS and one PSSCH, or by one DM-RS and two consecutive PSSCHs;

[0196] Among them, DM-RS carries SCI, and PSSCH carries CSI-RS.

[0197] In some embodiments, the first DM-RS of two consecutive DM-RSs or the first CSI-RS of two consecutive CSI-RSs is used for automatic gain control;

[0198] Alternatively, each OFDM symbol in a time slot is transmitted separately by a beam, and the maximum transmit power of each OFDM symbol is less than or equal to a preset maximum transmit power threshold.

[0199] In some embodiments, the processor 83 is further configured to:

[0200] If the beam scanning related information is carried in the DM-RS, the SCI also carries indication information of the beam scanning related information, and the indication information is used to indicate the OFDM symbol occupied by the DM-RS carrying the beam scanning related information.

[0201] In some embodiments, the SCI is a two-stage SCI, the two-stage SCI including a first-order SCI and a second-order SCI;

[0202] The two-level SCI carries the following information:

[0203] An extended field is provided in the first-order SCI, and indication information of beam scanning related information is carried in the extended field;

[0204] Alternatively, the indication information of the beam scanning related information is carried in the second-order SCI redundancy field.

[0205] In some embodiments, the SCI is a single-stage dedicated SCI;

[0206] Carrying beam scanning related information in a single-stage dedicated SCI;

[0207] Each OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by a DM-RS.

[0208] In some embodiments, if the DM-RS carrying the beam scanning related information is a periodic DM-RS, after the SCI is sent for the first time, the SCI is stopped from being sent.

[0209] In some embodiments, if the DM-RS carrying beam scanning related information is a periodic DM-RS, multiple directional beams are transmitted in one time slot, and each directional beam occupies two OFDM symbols of one time slot;

[0210] Two OFDM symbols are occupied by two consecutive DM-RSs; the DM-RSs carry the SCI and bear the CSI-RS.

[0211] In some embodiments, if a time slot does not carry a physical direct link feedback channel PSFCH, the symbols occupied by two guard time slots GP and two symbols occupied by PSFCH in the time slot are occupied by DM-RS.

[0212] Figure 8 In the embodiment, the transceiver 82 is used to receive and send data under the control of the processor 83. The bus architecture can include any number of interconnected buses and bridges, specifically various circuits of one or more processors represented by the processor 83 and the memory represented by the memory 81. The bus architecture can also link together various other circuits such as peripheral devices, voltage regulators and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 82 can be a plurality of components, that is, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, which includes a wireless channel, a wired channel, an optical cable and other transmission media. The processor 83 is responsible for managing the bus architecture and general processing, and the memory 81 can store data used by the processor 83 when performing operations.

[0213] Figure 8 In the embodiment, the processor 83 can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits in the processor 83 or software instructions. The processor 83 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 general-purpose processor can be a microprocessor or any conventional processor.

[0214] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0215] Those skilled in the art will appreciate that although some embodiments described herein include certain features and not others included in other embodiments, the combination of features from different embodiments is intended to be within the scope of this disclosure and to form different embodiments.

[0216] Those skilled in the art will understand that the description of each embodiment has its own focus, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0217] Although the embodiments of the present disclosure have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present disclosure, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A reference signal indication method, applied to a transmitting end, comprising: The transmitting end sends direct link control information SCI, wherein the SCI carries indication information of a channel state information reference signal CSI-RS, and the indication information is used to indicate the time-frequency resources occupied by the CSI-RS; The transmitting end transmits the CSI-RS on the time-frequency resource, wherein the CSI-RS or the SCI carries beam scanning related information.

2. The method according to claim 1, wherein The SCI is a two-level SCI, and the two-level SCI includes a first-level SCI and a second-level SCI; The CSI-RS indication information is carried in the two-level SCI, including: Extending a domain in the first-order SCI, and carrying indication information of the CSI-RS in the extended domain; Alternatively, the indication information of the CSI-RS is carried in the second-order SCI redundancy field.

3. The method according to claim 1, wherein The SCI is a single-stage dedicated SCI; The beam scanning related information is carried in the single-stage dedicated SCI.

4. The method according to claim 3, wherein: Each orthogonal frequency division multiplexing OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by the CSI-RS.

5. The method according to claim 1, wherein The SCI also carries a time window, which is used by the receiving end to select different ways to trigger the sending of the CSI-RS.

6. The method according to claim 1, wherein The CSI-RS is an aperiodic CSI-RS or a periodic CSI-RS; If the CSI-RS is a periodic CSI-RS, the transmitting end stops sending the SCI after sending the SCI for the first time.

7. The method according to claim 6, wherein: If the CSI-RS is a periodic CSI-RS, the transmitting end transmits multiple directional beams in one time slot, and each directional beam occupies three OFDM symbols in one time slot; The three OFDM symbols are occupied by two consecutive demodulation reference signals DM-RS and one PSSCH, or by one DM-RS and two consecutive PSSCHs; The DM-RS carries the SCI, and the PSSCH carries the CSI-RS.

8. The method according to claim 7, wherein: The first DM-RS among two consecutive DM-RSs or the first CSI-RS among two consecutive CSI-RSs is used for automatic gain control; Alternatively, the transmitting end transmits each OFDM symbol in a time slot separately by a beam, and the maximum transmission power of each OFDM symbol is less than or equal to a preset maximum transmission power threshold.

9. The method according to claim 1, wherein The method further comprises: If the beam scanning related information is carried in the DM-RS, the SCI also carries indication information of the beam scanning related information, and the indication information is used to indicate the OFDM symbol occupied by the DM-RS carrying the beam scanning related information.

10. The method according to claim 9, wherein: The SCI is a two-level SCI, and the two-level SCI includes a first-level SCI and a second-level SCI; The indication information carrying the beam scanning related information in the two-level SCI includes: Extending a field in the first-order SCI, and carrying indication information of the beam scanning related information in the extended field; Alternatively, the indication information of the beam scanning related information is carried in the field of the second-order SCI redundancy.

11. The method according to claim 9, wherein The SCI is a single-stage dedicated SCI; Carrying the beam scanning related information in the single-stage dedicated SCI; Each OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by a DM-RS.

12. The method according to claim 9, wherein If the DM-RS carrying the beam scanning related information is a periodic DM-RS, the transmitting end stops sending the SCI after sending the SCI for the first time.

13. The method according to claim 12, wherein: If the DM-RS carrying the beam scanning related information is a periodic DM-RS, the transmitting end transmits multiple directional beams in one time slot, and each directional beam occupies two OFDM symbols in one time slot; The two OFDM symbols are occupied by two consecutive DM-RSs; the DM-RSs carry the SCI and bear the CSI-RS.

14. The method according to claim 13, wherein: If a time slot does not carry the physical direct link feedback channel PSFCH, the symbols occupied by two guard time slots GP and two symbols occupied by PSFCH in the time slot are occupied by DM-RS.

15. A reference signal indication device, applied to a transmitting end, comprising: The first unit is configured to send direct link control information SCI, wherein the SCI carries indication information of a channel state information reference signal CSI-RS, and the indication information is used to indicate the time-frequency resources occupied by the CSI-RS; The second unit is configured to send the CSI-RS on the time-frequency resources, wherein the CSI-RS or the SCI carries beam scanning related information.

16. A communication device, wherein: Including memory, transceiver, processor; The memory is used to store a computer program; the transceiver is used to send and receive data under the control of the processor; and the processor is used to read the computer program in the memory and execute: Sending direct link control information SCI, wherein the SCI carries indication information of a channel state information reference signal CSI-RS, and the indication information is used to indicate the time-frequency resources occupied by the CSI-RS; The CSI-RS is sent on the time-frequency resource, wherein the CSI-RS or the SCI carries beam scanning related information.

17. The communication device according to claim 16, wherein: The SCI is a two-level SCI, and the two-level SCI includes a first-level SCI and a second-level SCI; The CSI-RS indication information is carried in the two-level SCI, including: Extending a domain in the first-order SCI, and carrying indication information of the CSI-RS in the extended domain; Alternatively, the indication information of the CSI-RS is carried in the second-order SCI redundancy field.

18. The communication device according to claim 16, wherein: The SCI is a single-stage dedicated SCI; The beam scanning related information is carried in the single-stage dedicated SCI.

19. The communication device according to claim 18, wherein: Each orthogonal frequency division multiplexing OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by the CSI-RS.

20. The communication device according to claim 16, wherein The SCI also carries a time window, which is used by the receiving end to select different ways to trigger the sending of the CSI-RS.

21. The communication device according to claim 16, wherein The CSI-RS is an aperiodic CSI-RS or a periodic CSI-RS; If the CSI-RS is a periodic CSI-RS, the SCI is stopped from being sent after the SCI is sent for the first time.

22. The communication device according to claim 21, wherein If the CSI-RS is a periodic CSI-RS, multiple directional beams are transmitted in one time slot, and each directional beam occupies three OFDM symbols in one time slot; The three OFDM symbols are occupied by two consecutive demodulation reference signals DM-RS and one PSSCH, or by one DM-RS and two consecutive PSSCHs; The DM-RS carries the SCI, and the PSSCH carries the CSI-RS.

23. The communication device according to claim 22, wherein: The first DM-RS among two consecutive DM-RSs or the first CSI-RS among two consecutive CSI-RSs is used for automatic gain control; Alternatively, each OFDM symbol in a time slot is transmitted separately by a beam, and the maximum transmit power of each OFDM symbol is less than or equal to a preset maximum transmit power threshold.

24. The communication device according to claim 16, wherein The processor is further configured to: If the beam scanning related information is carried in the DM-RS, the SCI also carries indication information of the beam scanning related information, and the indication information is used to indicate the OFDM symbol occupied by the DM-RS carrying the beam scanning related information.

25. The communication device according to claim 24, wherein The SCI is a two-level SCI, and the two-level SCI includes a first-level SCI and a second-level SCI; The indication information carrying the beam scanning related information in the two-level SCI includes: Extending a field in the first-order SCI, and carrying indication information of the beam scanning related information in the extended field; Alternatively, the indication information of the beam scanning related information is carried in the field of the second-order SCI redundancy.

26. The communication device according to claim 24, wherein The SCI is a single-stage dedicated SCI; Carrying the beam scanning related information in the single-stage dedicated SCI; Each OFDM symbol occupied by the physical direct link shared channel PSSCH in the transmission time slot of the single-stage dedicated SCI is occupied by a DM-RS.

27. The communication device according to claim 24, wherein If the DM-RS carrying the beam scanning related information is a periodic DM-RS, after sending the SCI for the first time, the SCI is stopped from being sent.

28. The communication device according to claim 27, wherein If the DM-RS carrying the beam scanning related information is a periodic DM-RS, multiple directional beams are transmitted in one time slot, and each directional beam occupies two OFDM symbols in one time slot; The two OFDM symbols are occupied by two consecutive DM-RSs; the DM-RSs carry the SCI and bear the CSI-RS.

29. The communication device according to claim 28, wherein If a time slot does not carry the physical direct link feedback channel PSFCH, the symbols occupied by two guard time slots GP and two symbols occupied by PSFCH in the time slot are occupied by DM-RS.

30. A processor-readable storage medium, wherein: The processor-readable storage medium stores a program, and the program is used to enable the processor to execute the reference signal indication method according to any one of claims 1 to 14.

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