Downlink beam management method and apparatus, communication device, and storage medium

Abstract

The present application relates to the technical field of communications, and discloses a downlink beam management method and apparatus, a communication device, and a storage medium. The downlink beam management method in embodiments of the present application comprises: a terminal receives N first signals sent by a network side device, the first signal being used for determining a target beam for target downlink transmission, and N being a positive integer, wherein the first signal comprises at least one of the following: a first SSB; and a first downlink signal.

Description

Downlink beam management method, device, communication equipment and storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202311428999.5 filed in China on October 30, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of communication technology, and specifically relates to a downlink beam management method, apparatus, communication equipment and storage medium. Background Art

[0004] In the New Radio (NR) system, downlink beam management can be performed through the Synchronization Signal Block (SSB) and the Channel State Information-Reference Signal (CSI-RS). In the NR Radio Resource Control (RRC) connection state, the use of CSI-RS can provide better downlink beam management than SSB. However, in the NR idle or inactive state, how to implement downlink beam management is an urgent problem to be solved.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a downlink beam management method, apparatus, communication equipment and storage medium, which can solve the problem of implementing downlink beam management in a non-RRC connection state.

[0007] In a first aspect, a downlink beam management method is provided, which includes: a terminal receives N first signals sent by a network side device, and the first signal is used to determine a target beam for a target downlink transmission, where N is a positive integer; wherein the first signal includes at least one of the following: a first SSB; a first downlink signal.

[0008] In the second aspect, a downlink beam management method is provided, which includes: a network side device sends N first signals to a terminal, the first signal being used to determine a target beam for a target downlink transmission, where N is a positive integer; wherein the first signal includes at least one of the following: a first SSB; a first downlink signal.

[0009] In a third aspect, a downlink beam management device is provided, comprising: a receiving module. The receiving module is configured to receive N first signals sent by a network-side device, the first signals being used to determine a target beam for a target downlink transmission, where N is a positive integer; wherein the first signals include at least one of the following: a first SSB; or a first downlink signal.

[0010] In a fourth aspect, a downlink beam management device is provided, comprising: a transmitting module configured to transmit N first signals to a terminal, the first signals being used to determine a target beam for a target downlink transmission, where N is a positive integer; wherein the first signals include at least one of the following: a first SSB; or a first downlink signal.

[0011] In a fifth aspect, a terminal is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0012] In the sixth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the communication interface is used to receive N first signals sent by a network side device, the first signal being used to determine a target beam for a target downlink transmission, where N is a positive integer; wherein the first signal includes at least one of the following: a first SSB; a first downlink signal.

[0013] In the seventh aspect, a network side device is provided, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the first aspect are implemented.

[0014] In the eighth aspect, a network side device is provided, including a processor and a communication interface, wherein the communication interface is used to send N first signals to the terminal, and the first signal is used to determine the target beam of the target downlink transmission, where N is a positive integer; wherein the first signal includes at least one of the following: a first SSB; a first downlink signal.

[0015] In the ninth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

[0016] In the tenth aspect, a wireless communication system is provided, comprising: a terminal and a network side device, wherein the terminal can be used to execute the steps of the method described in the first aspect, and the network side device can be used to execute the steps of the method described in the second aspect.

[0017] In the eleventh aspect, a chip is provided, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the method as described in the first aspect, or to implement the method as described in the second aspect.

[0018] In the twelfth aspect, a computer program / program product is provided, which is stored in a storage medium and is executed by at least one processor to implement the steps of the downlink beam management method as described in the first aspect, or to implement the steps of the downlink beam management method as described in the second aspect.

[0019] In an embodiment of the present application, a terminal may receive N first signals sent by a network-side device to determine a target beam for a target downlink transmission, where the first signal includes at least one of the following: a first SSB and a first downlink signal. In this solution, the terminal may receive at least one of the first SSB and the first downlink signal sent by the network-side device to determine the beam for the downlink transmission. By introducing a downlink beam management signal, downlink beam management can be performed even in a non-RRC connected state, thereby ensuring the performance of downlink transmission during the random access process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of the architecture of a wireless communication system provided in an embodiment of the present application;

[0021] FIG2 is a schematic diagram of an example of SSB mapping to RO provided by the related art;

[0022] FIG3 is a schematic structural diagram of a MAC RAR subPDU provided by the related art;

[0023] FIG4 is a flowchart of a downlink beam management method according to an embodiment of the present application;

[0024] FIG5 is a second flowchart of a downlink beam management method provided in an embodiment of the present application;

[0025] FIG6 is a third flowchart of a downlink beam management method provided in an embodiment of the present application;

[0026] FIG7 is a structural diagram of a downlink beam management device according to an embodiment of the present application;

[0027] FIG8 is a second structural diagram of a downlink beam management device provided in an embodiment of the present application;

[0028] FIG9 is a third structural diagram of a downlink beam management device provided in an embodiment of the present application;

[0029] FIG10 is a fourth structural diagram of a downlink beam management device provided in an embodiment of the present application;

[0030] FIG11 is a schematic diagram of the hardware structure of a communication device provided in an embodiment of the present application;

[0031] FIG12 is a schematic diagram of the hardware structure of a terminal provided in an embodiment of the present application;

[0032] FIG13 is a schematic diagram of the hardware structure of a network-side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described 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 are within the scope of protection of this application.

[0034] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects, for example, the first object can be one or more. In addition, "or" in this application represents at least one of the connected objects. For example, "A or B" covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0035] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, the operation to be performed, or the requested result, etc. in the instruction sent; an indirect indication can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the operation to be performed or the requested result, etc. based on the judgment result.

[0036] The terms "at least one" and "at least one of" in this application refer to any one, any two, or a combination of more than two of the objects included. For example, at least one of a, b, and c can be represented by: "a", "b", "c", "a and b", "a and c", "b and c", and "a, b, and c", where a, b, and c can be single or multiple. Similarly, "at least two" means two or more, and its meaning is similar to "at least one".

[0037] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the technology described can be used for the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) systems. th Generation, 6G) communication system.

[0038] FIG1 is a block diagram of a wireless communication system applicable to an embodiment of the present application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR), a virtual reality (VR) device, a robot, a wearable device (Wearable Device), an aircraft (Flight Vehicle), a vehicle-mounted device (VUE), a ship-mounted device, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), a game console, a personal computer (PC), an ATM, or a self-service machine, or other terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be called a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (WLAN) access point (AS) or a wireless fidelity (WiFi) node, etc.Among them, the base station can be referred to as Node B (NB), Evolved Node B (eNB), the next generation Node B (gNB), New Radio Node B (NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home evolved Node B (home evolved Node B), Transmission Reception Point (TRP) or other appropriate terms in the relevant field. As long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0039] The following explains some concepts and / or terms involved in the downlink beam management method, device, communication equipment and storage medium provided in the embodiments of the present application.

[0040] 1. Random access process

[0041] The random access process can be a contention-based or non-contention-based random access process. The random access process can be divided into a 4-step random access process (also known as a Type-1 random access process) and a 2-step random access process (also known as a Type-2 random access process).

[0042] In NR Rel-15, the contention-based 4-step random access process: the terminal first sends Msg1, i.e., the random access preamble, to the network; after the network detects the preamble, it sends Msg2, i.e., the Random Access Reception (RAR) message, which contains the preamble number detected by the network, i.e., the Random Access Channel Preamble ID (RAPID), the physical uplink shared channel (PUSCH) resources allocated to the terminal to send Msg3 (uplink authorization information), the temporary cell-radio network temporary identifier (TC-RNTI), the timing advance (TI) and the time delay. After receiving Msg2, if the terminal confirms that at least one of the preamble numbers carried in Msg2 is consistent with the preamble number it sent, it will send Msg3 containing contention resolution information based on the uplink resources indicated in the RAR. If the network does not receive Msg3 PUSCH, it can schedule the retransmission of Msg3 PUSCH in the TC-RNTI scrambled Physical Downlink Control Channel (PDCCH). After receiving Msg3, the network will send Msg4 containing contention resolution information. After receiving Msg4, the terminal confirms that the resolution information is consistent with the one it sent in Msg3, thus completing the four-step random access.

[0043] In the contention-based random access process, different terminals randomly select preambles for transmission. This means that different terminals may select the same preamble to transmit at the same random access opportunity. This situation can be understood as a terminal preamble conflict. At this time, different terminals will receive the same RAR and transmit Msg3 PUSCH based on the scheduling information of the UL grant in the RAR. However, the network can only decode the PUSCH (including contention resolution information) sent by one terminal on one Msg3 PUSCH scheduling resource. The network will include the contention resolution information received in Msg3 in Msg4. If the contention resolution information received in Msg4 matches the contention resolution information sent by the terminal in Msg3 PUSCH, the terminal considers the contention resolution successful. If they do not match, the contention resolution is considered unsuccessful. If the contention resolution is unsuccessful, the terminal reselects the RACH transmission resource, transmits the Physical Random Access Channel (PRACH), and makes the next random access attempt.

[0044] NR Rel-16 introduced the 2-step random access procedure (2-step RACH). The first step is for the terminal to send MsgA to the network. After receiving MsgA, the network sends MsgB to the terminal. If the terminal does not receive MsgB within a certain period of time, it increments the counter that counts the number of MsgA transmissions and resends MsgA. If the counter reaches a certain threshold, the terminal switches from the 2-step random access procedure to the 4-step random access procedure.

[0045] MsgA consists of the MsgA preamble and the MsgA PUSCH. The preamble is sent on the random access channel opportunity (RACH Occasion, RO) used for 2-step RACH, and the PUSCH is sent on the MsgA PUSCH resources associated with the sent MsgA preamble and RO. The MsgA PUSCH resources are a set of PUSCH resources configured for each PRACH slot, including time-frequency resources and demodulation reference signal (DMRS) resources.

[0046] 2. Random access resource selection

[0047] In NR, a cell can configure multiple frequency division multiplexing (FDM) physical random access channel (PRACH) transmission occasions (also known as PRACH occasions, or ROs) at a single PRACH transmission time location. The number of ROs that can be FDMed at a given moment can be: {1, 2, 4, 8}. As shown in Figure 2 (a), at a given moment, there are eight RO resources distributed across different frequency domain resources.

[0048] Preamble can only be transmitted on the time domain resources (i.e., RO resources) configured by the high-level parameter PRACHConfigurationIndex, and can only be transmitted on the frequency domain resources n configured by the high-level parameter prach-FDM RA ∈{0,1,...,M-1}, where M is the high-level parameter prach-FDM. At the time of initial access, the frequency domain resource n of PRACH RA The frequency domain resources of PRACH are numbered in ascending order starting from the lowest RO resource in the initial active uplink bandwidth part. Otherwise, the frequency domain resources of PRACH are numbered in ascending order. RA The RO resources are numbered in ascending order, starting from the RO resource with the lowest frequency within the active uplink bandwidth part. As shown in FIG2(a), the RO resources are numbered from RO#0 to RO#7 in ascending order of frequency.

[0049] In NR, there is an association between the RO and the synchronization signal (SS) / physical broadcast channel (PBCH) block (SSB) actually transmitted. One SSB may be associated with multiple ROs, or multiple SSBs may be associated with one RO (in this case, different SSBs correspond to different preamble codes). Generally, the base station can use different beams to transmit different SSBs, and the corresponding terminal sends the preamble on the RO associated with the SSB. In this way, the terminal selects the RO or RO+preamble combination associated with the SSB with good RSRP strength based on the RSRP strength of the received SSB, and sends the preamble. In this way, the network can determine the SSB selected by the terminal based on the RO or RO+preamble combination of the received preamble. The network then sends Msg2 on the downlink beam corresponding to the SSB to ensure the reception quality of the downlink signal.

[0050] Taking Figure 2 (a) as an example, the number of FDM ROs at a time is 8, and the number of SSBs actually transmitted is 4, namely SSB#0, SSB#1, SSB#2, and SSB#3. Each SSB is associated with two ROs. If the terminal determines to send the preamble on the RO corresponding to SSB#0, it can select an RO between RO#0 and RO#1 to send the PRACH.

[0051] Taking (b) in Figure 2 as an example, the number of ROs of FDM at a time is 2, and the number of SSBs actually transmitted is 8, namely SSB#0, SSB#1, ..., SSB#7, and every 2 SSBs are associated with 1 RO. When multiple SSBs share one RO, the preamble sets associated with the multiple SSBs are different (the same preamble cannot belong to the preamble set 0 associated with different SSBs at the same time). Taking RO#0 as an example, it has 60 preambles associated with SSBs, of which preambles with indexes 0 to 29 are associated with SSB#0, and preambles with indexes 30 to 59 are associated with SSB#1.

[0052] Before sending PRACH, the terminal first performs resource selection. First, based on the RSRP of the received SSB, it selects the SSB with RSRP higher than the threshold; if there are multiple SSBs with RSRP higher than the threshold, the terminal can select any SSB with RSRP higher than the threshold; when there is no SSB with RSRP higher than the threshold, the terminal selects an SSB based on the implementation.

[0053] Based on the network configuration, the terminal obtains the correspondence between the SSB and the RO. After selecting the SSB, the RO corresponding to the selected SSB is used as the RO for sending PRACH / Preamble. If the selected SSB is associated with multiple ROs, the terminal can select one of the ROs for PRACH / Preamble transmission.

[0054] For example: in the example shown in (a) of Figure 2, assuming that the terminal selects SSB#1, the terminal can select one from RO#2 and RO#3 to send PRACH / Preamble; in the example shown in (b) of Figure 2, if the terminal selects SSB#1, the terminal can select the available RO closest to the current time among the ROs (RO#0 or #4) associated with SSB#1 to send PRACH / Preamble.

[0055] In the selected RO, the terminal selects a preamble from the preamble set associated with the selected SSB for PRACH transmission. As shown in Figure 2(b), an RO is associated with two SSBs. In this case, the available preamble set associated with each SSB in the RO is divided into two subsets, one for each SSB. The terminal selects a preamble sequence from the preamble subset corresponding to the selected SSB for PRACH transmission.

[0056] 3. RAR

[0057] The RAR in NR is carried by the Medium Access Control (MAC) sub-protocol data unit (subPDU). There are three types of MAC RAR subPDUs:

[0058] The first subPDU is used for backoff indication and consists of a MAC subheader. The specific structure is shown in Figure 3 (a). "E" is the extension field, indicating whether this subPDU is the last subPDU in the MAC PDU; a value of 0 indicates it is the last; "T" is set to 0; "R" is a reserved bit; and "BI" indicates the cell's overhead condition. It should be noted that if this subPDU is transmitted, it must appear at the very beginning of the RAR MAC PDU.

[0059] The second subPDU is used to request System Information (SI). It contains only a subheader that carries the RAPID. The specific structure is shown in Figure 3(b). "E" is the extension field, which indicates whether this subPDU is the last subPDU in the MAC PDU. If it is 0, it means it is the last one; "T" is set to 1; and "RAPID" is used to carry the RAPID.

[0060] The third subPDU indicates RAPID with MAC RAR and consists of a MAC subheader carrying RAPID and a MAC RAR. The specific structure is shown in Figure 3 (c). In the MAC RAR, "R" is a reserved bit; "TA command" indicates the timing advance; "UL Grant" indicates the resource scheduling information for the first PUSCH (i.e., Msg3) of the RAR; and "TC-RNTI" carries the TC-RNTI.

[0061] The 27 bits of "UL Grant" contain 6 fields:

[0062] Frequency hopping flag (1 bit): used to indicate whether PUSCH is enabled for frequency hopping;

[0063] PUSCH frequency domain resource allocation (14 bits): used to indicate the frequency domain scheduling position of PUSCH and the offset of frequency hopping (offset, if frequency hopping is enabled);

[0064] PUSCH time domain resource allocation (4 bits): used to indicate the time domain scheduling position of PUSCH;

[0065] Modulation and Coding Scheme (MCS) (4 bits): used to indicate the MCS level, where the selection of the MCS table depends on whether transform precoding is enabled;

[0066] PUSCH Transmit Power Control (TPC) command (3 bits): used to indicate the power step size parameter {-6, -4, -2, 0, 2, 4, 6, 8} dB;

[0067] Channel State Information (CSI) request (1 bit): reserved bit.

[0068] 4. Downlink beam management

[0069] NR supports downlink beam management (also known as beam training) using SSBs or CSI-RS. During the initial access phase, the terminal can only perform downlink beam measurement using SSBs. After determining an SSB, the terminal sends a preamble on the associated RO. When receiving Msg2 and Msg4, or MsgB, the terminal uses the receive beam corresponding to the SSB associated with the RO that sent the preamble.

[0070] In the RRC connected state, the network side can configure SSB or CSI-RS for downlink beam measurement, and the terminal reports one or more corresponding RSRP values. In the subsequent transmission of PDCCH and Physical Downlink Shared Channel (PDSCH), the network can use the Transmission Configuration Indicator (TCI) to inform the terminal of the downlink beam of the network transmission PDCCH / PDSCH, that is, to inform the terminal to use the corresponding receive beam for reception.

[0071] Among them, downlink beam management can be divided into three processes: P1, P2 and P3:

[0072] P1 process: This process is primarily used for beam management during the initial access phase. Since the terminal has no prior information about beams, it exhaustively enumerates all receive beams under all SSBs to select an appropriate transmit / receive beam pair. During P1, for beam management efficiency and cell coverage, the widths of the SSB beams and the terminal's receive beams are typically relatively coarse. Ultimately, after P1, a coarse transmit / receive beam pair is determined.

[0073] P2 process: This process is to further adjust the network-side transmit beam based on P1, and further downlink beam management can be achieved through CSI-RS. At this time, the terminal's receive beam remains unchanged, and the network side sends CSI-RS through different downlink beams. The range of the CSI-RS transmit beam is subdivided based on the P1 process, thereby determining a finer downlink transmit beam to improve the beamforming gain. Among them, in order to inform the terminal that this is a further transmit beam adjustment on the network side, the network side will configure the CSI-RS repetition parameter to "off" to instruct the terminal not to change its receive beam during this process. After measuring multiple CSI-RS, the terminal reports one or more RSRP or Signal to Interference plus Noise Ratio (SINR) values ​​and the corresponding CSI-RS Resource Indicator (CRI) to the network side. After the P2 process, the network side adjusts the transmit beam to a finer beam for subsequent downlink transmission.

[0074] P3 process: This process is to adjust the receiving beam of the terminal. Based on the P1 process, the terminal further subdivides its receiving beam. At this time, the network side fixes its transmit beam (for example, the fine beam after the P2 process), and the terminal uses different fine beams to receive the same downlink beam, thereby selecting a suitable fine beam. In order to inform the terminal that it is now time to further adjust the receiving beam, the network side will configure the repetition parameter of CSI-RS to "on" to indicate that the terminal can change its receiving beam to measure the same downlink beam during this process. After the terminal uses different receiving beams for measurement, it does not need to report any parameters to the network side, and it can adjust the receiving beam by itself. After the P3 process, the terminal's receiving beam is adjusted to a finer beam for subsequent downlink reception.

[0075] Below, in combination with the accompanying drawings, the downlink beam management method, device, communication equipment and storage medium provided in the embodiments of the present application are described in detail through some embodiments and their application scenarios.

[0076] In the RRC connection state of NR, downlink beam management can be performed through SSB and CSI-RS, especially CSI-RS, which can provide more flexible and excellent downlink beam management effects than SSB. However, in non-RRC connection states such as NR idle state or inactive state, there is no corresponding solution for downlink beam management of the terminal. Therefore, for the non-RRC connection state scenarios of future communication systems (such as 6G systems), this application can provide relevant solutions for downlink beam management.

[0077] An embodiment of the present application provides a downlink beam management method, in which a terminal can receive N first signals sent by a network-side device to determine a target beam for a target downlink transmission, where the first signal includes at least one of the following: a first SSB and a first downlink signal. In this solution, the terminal can receive at least one of the first SSB and the first downlink signal sent by the network-side device to determine the downlink transmission beam. By introducing a downlink beam management signal, downlink beam management can be performed even in a non-RRC connected state, thereby ensuring the performance of downlink transmission during random access.

[0078] The embodiment of the present application provides a downlink beam management method, and Figure 4 shows a flow chart of the downlink beam management method provided by the embodiment of the present application. As shown in Figure 4, the downlink beam management method provided by the embodiment of the present application may include the following steps 201 and 202.

[0079] Step 201: A network-side device sends N first signals to a terminal.

[0080] Step 202: The terminal receives N first signals sent by the network-side device.

[0081] In an embodiment of the present application, the above-mentioned first signal is used to determine the target beam of the target downlink transmission, and N is a positive integer; wherein, the first signal includes at least one of the following: a first SSB; a first downlink signal.

[0082] It should be noted that the SSB described in the embodiment of the present application may also be a module including at least one of the following: synchronization signal, broadcast signal, PBCH, other system message downlink broadcast channel. The beam described in the embodiment of the present application can also be understood as a quasi-co-system (for example, a quasi-co-location relationship or a quasi-co-location reference), or a quasi-co-location of spatial reception parameters, or a spatial relationship, or a spatial transmission filter, or a spatial filter, or a spatial domain filter, etc.

[0083] It should be noted that the above-mentioned first downlink signal can be understood as a downlink signal used for beam management. Optionally, in an embodiment of the present application, the above-mentioned first downlink signal can be a downlink signal for obtaining channel state information (such as CSI-RS), or can be other downlink signals used for downlink beam management.

[0084] Optionally, in an embodiment of the present application, the network side device may use different downlink beams (for example, N beams) to send N first signals.

[0085] Optionally, in this embodiment of the present application, the N first signals are associated with at least one of the following:

[0086] a second SSB, the second SSB being different from the first SSB;

[0087] RO;

[0088] Random access preamble;

[0089] The second signal is an uplink signal.

[0090] Optionally, in an embodiment of the present application, at least one of the time-frequency resources, period, and whether PBCH is included in the first SSB and the second SSB may be different.

[0091] Optionally, in an embodiment of the present application, the first SSB does not include PBCH, and the second SSB includes PBCH. Alternatively, both the first SSB and the second SSB include PBCH.

[0092] Optionally, in an embodiment of the present application, the terminal may decode the Master Information Block (MIB) on the second SSB and not decode the MIB on the first SSB, thereby preferentially determining the location of the second SSB to quickly obtain the MIB message.

[0093] Optionally, in an embodiment of the present application, at least one of the RO and the preamble is associated with the second SSB, for example, the index of the second SSB.

[0094] Optionally, in an embodiment of the present application, the first SSB and the second SSB use different beams, the second SSB uses a wide beam, and the first SSB uses a thin beam. In addition, the second SSB can also be the beam reference source of the first SSB, and the beam reference source can also be understood as a Quasi Co-Location (QCL)-Type D reference source.

[0095] Optionally, in the embodiment of the present application, the N first signals are associated with the second SSB, including at least one of the following:

[0096] The N first signals are associated with one second SSB (for example, may be an index of the associated second SSB);

[0097] The beam reference source of the N first signals is a second SSB.

[0098] For example, taking the first signal as the first SSB as an example: during the initial access process, the terminal first measures multiple second SSBs and determines a suitable second SSB (for example, a second SSB indexed as SSB#n). After determining the second SSB, the terminal can determine N first SSBs through the association relationship between the second SSB and the N first SSBs, where the association relationship includes a beam reference relationship or a QCL reference relationship.

[0099] Optionally, in an embodiment of the present application, the N first signals may be associated with the same second SSB or different second SSBs. When associated with the same second SSB, the N first signals are configured for each SSB; when associated with different second SSBs, the N first signals are configured for each cell.

[0100] In an embodiment of the present application, the beam information can be implicitly indicated through the association relationship between the first signal and at least one of the RO and the preamble code, so that the network side can obtain the information of the downlink target beam.

[0101] Optionally, in the embodiment of the present application, the N first signals are associated with at least one of the RO and the preamble, including at least one of the following:

[0102] The N first signals correspond to N preamble codes or a group of N preamble codes;

[0103] N first signals correspond to N ROs or groups of N ROs;

[0104] The N first signals correspond to X preamble codes or groups of preamble codes, and Y ROs or groups of ROs, where X and Y are both positive integers.

[0105] Optionally, in an embodiment of the present application, the above-mentioned RO is associated with a second SSB (e.g., a second SSB index).

[0106] Optionally, in an embodiment of the present application, each first signal index in the above-mentioned N first signals corresponds to a preamble code or a group of preamble codes. The network side device can determine the first signal index based on the received preamble code, thereby implicitly obtaining information about the corresponding downlink target beam.

[0107] Optionally, in an embodiment of the present application, each first signal index in the above-mentioned N first signals corresponds to an RO or a group of ROs. The network side device can determine the first signal index based on the RO, thereby implicitly obtaining the corresponding downlink target beam information.

[0108] Optionally, in an embodiment of the present application, each first signal index in the above-mentioned N first signals corresponds to a preamble code and an RO, or each first signal index corresponds to a preamble code and a group of RO, or each first signal index corresponds to a preamble code group and an RO, or each first signal index corresponds to a preamble code group and a RO. The network side device can determine the first signal index based on the RO and the preamble code, thereby implicitly obtaining the corresponding downlink target beam information.

[0109] For example, N first signals are N CSI-RS resources, and N CSI-RSs are associated with the second SSB#n. After detecting the N CSI-RSs, the terminal finds that the beam corresponding to the second CSI-RS resource (CSI-RS#2) is the best. At this time, the terminal sends the corresponding Preamble#k on the RO corresponding to SSB#n. The Preamble#k corresponds to CSI-RS#2. The network-side device can infer that the optimal beam corresponds to CSI-RS#2 based on the Preamble#k detected on the RO. The optimal beam is the downlink target beam.

[0110] For another example, N first signals are N CSI-RS resources, and N CSI-RSs are associated with the second SSB#n. After detecting the N CSI-RSs, the terminal finds that the beam corresponding to the second CSI-RS resource (CSI-RS#2) is the best. At this time, the terminal sends the corresponding preamble on RO#k corresponding to SSB#n. RO#k corresponds to CSI-RS#2. The network-side device can infer that the optimal beam corresponds to CSI-RS#2 based on the preamble detected on RO#k. The optimal beam is the downlink target beam.

[0111] In some cases, such as when uplink and downlink beams are mutually different, the N first signals can be associated with the uplink signal to optimize beam management. The terminal can use the association between the first signal and the second signal to inform the network device of the downlink target beam information.

[0112] Optionally, in the embodiment of the present application, the second signal may be an uplink signal for acquiring signal status information, such as an uplink sounding reference signal (SRS).

[0113] Optionally, in the embodiment of the present application, the N first signals are associated with the second signal, including any of the following:

[0114] An index association between the N first signals and the M second signals, where M is a positive integer;

[0115] The first set to which the N first signals belong is associated with the second set to which the M second signals belong. The first set or the second set includes at least one of the following: a resource set, a resource subset, a resource group, or a resource list.

[0116] It should be noted that, when M=N, the N first signals correspond one-to-one to the M second signals.

[0117] In an embodiment of the present application, when a second signal exists, the second signal may also be associated with the SSB, thereby determining an uplink receiving beam when the network side receives the second signal.

[0118] Optionally, in an embodiment of the present application, the above-mentioned M second signals are associated with the second SSB, where M is a positive integer; or, the above-mentioned M second signals are associated with at least one of the preamble code and RO.

[0119] For example, for the case where M second signals are associated with the second SSB. The network-side device receives the second signal on the beam corresponding to SSB#n. Take the first signal as CSI-RS and the second signal as SRS as an example. Assume that M=N SRS resources are associated with the second SSB#n, and N CSI-RS resources are also associated with the second SSB#n. When the terminal further performs beam measurement of N CSI-RSs under the beam of the second SSB#n, it finds that CSI-RS#m is the optimal beam. Since there is no CSI report at this time, the terminal can only send the SRS corresponding to CSI-RS#m. The network side receives the SRS on the beam corresponding to SSB#n, thereby obtaining the signal of the downlink target beam, that is, the optimal CSI-RS beam.

[0120] Optionally, in an embodiment of the present application, the above-mentioned M second signals are associated with one or more preamble codes; or, the above-mentioned M second signals are associated with one or more ROs; or, the above-mentioned M second signals are associated with one or more preamble codes and one or more ROs; or, one second signal is associated with one or more preamble codes; or, one second signal is associated with one or more ROs; or, one second signal is associated with one or more preamble codes and one or more ROs.

[0121] For example, taking the second signal as SRS, assuming that M SRSs are associated with one RO, and the RO is associated with SSB#n, the association relationship between SRS and RO enables the network side device to perform uplink reception of SRS through the SSB corresponding to the RO or the beam corresponding to the CSI-RS.

[0122] Optionally, in the embodiment of the present application, the target downlink transmission includes at least one of the following:

[0123] Transmission of the downlink channel of Msg2;

[0124] Transmission of the downlink channel of MsgB;

[0125] Transmission of the downlink channel of Msg4;

[0126] Any other downlink channel transmission in idle or inactive state.

[0127] Optionally, in an embodiment of the present application, the downlink channel may include at least one of the following: a downlink control channel and a downlink data channel.

[0128] Optionally, in an embodiment of the present application, in combination with Figure 4, as shown in Figure 5, after the above-mentioned step 202, the downlink beam management method provided in the embodiment of the present application also includes the following steps 301 and 302.

[0129] Step 301: The terminal indicates one or more target beams to the network side device through the first information or the second information.

[0130] Step 302: The network-side device determines one or more target beams, where the one or more target beams are indicated by the terminal through the first information or the second information.

[0131] In this embodiment of the present application, the second information is associated with the first signal. The first information includes at least one of the following: Medium Access Control-Control Element (MAC CE) signaling, Msg3, and MsgA PUSCH; the second information includes at least one of the following: RO, a random access preamble, and a second signal, where the second signal is an uplink signal.

[0132] It should be noted that the information of the target beam finally determined is known between the network side equipment and the terminal through implicit (such as the various association relationships mentioned above) or explicit indication or reporting.

[0133] The above-mentioned second information can be understood as an implicit indication method, that is, after the network side device receives the second information, it can determine the target beam of the target downlink transmission based on the second information, and the terminal will also default to agree that the network side will perform subsequent target downlink transmission based on the target beam determined by the second information.

[0134] In the embodiment of the present application, after the network side device determines the target beam, the beam of the subsequent channel transmission of Msg2, Msg4 or MsgB needs to be indicated by the network side device or determined by the default agreed rule. Among them, it can be divided into two parts: PDCCH and PDSCH.

[0135] Optionally, in an embodiment of the present application, for the first PDCCH, the beam transmitting the first PDCCH is the target beam indicated by the second information; wherein, the first PDCCH is the PDCCH in Msg2 or MsgB.

[0136] It should be noted that it can also be understood that: the beam reference of the first PDCCH is the first signal corresponding to the target beam. In this case, the terminal uses the receiving beam corresponding to the target beam to receive the first PDCCH.

[0137] Optionally, in an embodiment of the present application, for the first PDSCH, the beam transmitting the first PDSCH is the target beam indicated by the second information, or the beam transmitting the first PDSCH is the first beam indicated in the downlink control information (DCI) for scheduling the first PDSCH; wherein, the first PDSCH is the PDSCH in Msg2 or MsgB.

[0138] It should be noted that it can also be understood that: the beam reference of the first PDSCH is the first signal corresponding to the target beam. In this case, the terminal uses the receiving beam corresponding to the target beam to receive the first PDSCH.

[0139] Optionally, in this embodiment of the present application, the DCI includes a field for indicating the first beam; wherein the field satisfies at least one of the following:

[0140] The domain indicates an index of the first signal, where the first signal corresponds to the first beam;

[0141] There is an association between the domain and the preamble index of random access.

[0142] Optionally, in an embodiment of the present application, the above-mentioned field may indicate one or more first signal indexes, and the multiple first signal indexes are for different terminals.

[0143] In the embodiment of the present application, after demodulating the DCI, the terminal can determine the beam used by the network side device to transmit the first PDSCH, thereby adjusting its receiving beam for receiving the first PDSCH.

[0144] Optionally, in an embodiment of the present application, the beam for transmitting the first PDSCH is the target beam indicated by the second information or the first beam indicated in the DCI, and is determined by third information; wherein the third information includes at least one of the following:

[0145] a scheduling interval between the DCI scheduling the first PDSCH and the first PDSCH;

[0146] the number of the first signal;

[0147] The format type of the random access preamble.

[0148] For example, when the scheduling interval between the DCI and the first PDSCH is less than a certain threshold, the default agreement is to use the target beam indicated by the second information; when the number of first signals is 1 or the first signal does not exist, the target beam indicated by the second information (which can be SSB or CSI-RS) is used; if there is a certain correlation between the format type of the preamble code and the beam indication, the decision can also be made based on different preamble code format types.

[0149] Optionally, in an embodiment of the present application, for the second PDCCH, the beam transmitting the second PDCCH is the target beam indicated by the second information, or the beam transmitting the second PDCCH is the second beam indicated by the RAR message; wherein the second PDCCH is the PDCCH in Msg4.

[0150] It should be noted that it can also be understood that: the beam reference of the second PDCCH is the first signal corresponding to the target beam. In this case, the terminal uses the receiving beam corresponding to the target beam to receive the second PDCCH.

[0151] Optionally, in an embodiment of the present application, a beam indication-related field may be added to the RAR message to indicate the beam for transmitting the second PDCCH (second beam), and may also indicate the beam for transmitting the Msg4 PDSCH.

[0152] Optionally, in an embodiment of the present application, for the second PDSCH, the beam transmitting the second PDSCH is the target beam indicated by the second information, or the beam transmitting the second PDSCH is the third beam indicated by the DCI scheduling the second PDSCH, or the beam transmitting the second PDSCH is the same as the beam transmitting the PDSCH of Msg2; wherein the second PDSCH is the PDSCH in Msg4.

[0153] It should be noted that it can also be understood that: the beam reference of the second PDSCH is the first signal corresponding to the target beam. In this case, the terminal uses the receiving beam corresponding to the target beam to receive the second PDSCH.

[0154] Optionally, in an embodiment of the present application, for other downlink channels, the beam transmitting other downlink channels is the target beam indicated by the second information; or, the beam transmitting other downlink channels is the fourth beam indicated by the RAR message, DCI or MAC CE signaling; wherein, the other downlink channels are downlink channels other than the downlink channels of Msg2, MsgB and Msg4.

[0155] It should be noted that it can also be understood that: the beam reference of other downlink channels is the first signal corresponding to the target beam. In this case, the terminal uses the receiving beam corresponding to the target beam to receive other downlink channels.

[0156] Optionally, in an embodiment of the present application, the above-mentioned other downlink channels may include at least one of the following: a phase reference signal (Tracking Reference Signal, TRS), a positioning reference signal (Positioning Reference Signal, PRS), a broadcast channel, a paging channel, etc.

[0157] Optionally, in an embodiment of the present application, when retransmission, reselection, or repeated transmission occurs in the above-mentioned target downlink transmission, the terminal and the network-side device agree by default to determine the beam of the target downlink transmission by a first method, and the first method includes any one of the following:

[0158] Using downlink beams other than the target beam used for the previous target downlink transmission;

[0159] According to the order of the multiple target beams determined by the first method, the next beam after the target beam used for the previous target downlink transmission is adopted;

[0160] Continue to use the target beam used for the previous target downlink transmission.

[0161] Optionally, in an embodiment of the present application, in combination with Figure 4 , as shown in Figure 6 , before the above-mentioned step 201 , the downlink beam management method provided in the embodiment of the present application also includes the following steps 401 and 402 .

[0162] Step 401: The network-side device sends a first message to the terminal.

[0163] Step 402: The terminal receives a first message sent by the network-side device.

[0164] In the embodiment of the present application, the first message is used to configure or indicate at least one of the configuration information of the first signal and the configuration information of the second signal. The first message is any one of the following: MIB, SI, RRC release message, RAR message, DCI, MAC CE signaling.

[0165] Optionally, in this embodiment of the present application, the configuration information of the first signal includes at least one of the following:

[0166] An association relationship between the first signal and fourth information, the fourth information including at least one of the following: a second SSB, a preamble, and an RO;

[0167] transmission time-frequency resources of the first signal;

[0168] the number of the first signal;

[0169] a sequence of first signals;

[0170] port information of the first signal;

[0171] a period of the first signal;

[0172] The correlation relationship between the first signal and the second signal.

[0173] Optionally, in this embodiment of the present application, the configuration information of the second signal includes at least one of the following:

[0174] transmission time-frequency resources of the second signal;

[0175] the number of second signals;

[0176] a sequence of a second signal;

[0177] port information of the second signal;

[0178] a period of the second signal;

[0179] an association relationship between the second signal and the first signal;

[0180] The association relationship between the second signal and the fourth information, where the fourth information includes at least one of the following: a second SSB, a preamble code, and an RO.

[0181] In an embodiment of the present application, the terminal obtains in advance at least one of the configuration information of the first signal and the configuration information of the second signal, which can facilitate the correct reception of the first signal and the correct interpretation of the association relationship between the first signal and the other signals, thereby determining the target beam of the target downlink transmission and realizing downlink beam management.

[0182] Optionally, in an embodiment of the present application, the fifth information of the above-mentioned N first signals is determined by the terminal through the second SSB; wherein, the fifth information includes at least one of the following: transmission time and frequency resources, transmission period, index, and port information.

[0183] In an embodiment of the present application, after the terminal obtains the N first signals, it can measure the N first signals and determine a suitable first signal. In addition, a default agreed rule may exist between the transmission time-frequency resources of the N first signals and the transmission time-frequency resources of the second SSB. When the terminal detects the second SSB, it can find the transmission time-frequency resources of the N first signals according to the default agreed rule.

[0184] An embodiment of the present application provides a downlink beam management method, in which a terminal can receive N first signals sent by a network-side device to determine a target beam for a target downlink transmission, where the first signal includes at least one of the following: a first SSB and a first downlink signal. In this solution, the terminal can receive at least one of the first SSB and the first downlink signal sent by the network-side device to determine the beam for the downlink transmission. By introducing a downlink beam management signal, downlink beam management can be performed even in a non-RRC connected state, thereby ensuring the performance of downlink transmission in a random access process (e.g., a contention-based random access process in an idle / inactive state).

[0185] Each of the above-mentioned method embodiments, or various possible implementation methods in each method embodiment, can be executed separately, or any two or more of them can be executed in combination with each other. The specific implementation can be determined according to actual usage requirements, and the embodiments of this application do not limit this.

[0186] The downlink beam management method provided in the embodiment of the present application may be executed by a downlink beam management device. In the embodiment of the present application, the downlink beam management device provided in the embodiment of the present application is described by taking the downlink beam management device executing the downlink beam management method as an example.

[0187] FIG7 shows a possible structural diagram of a downlink beam management device involved in an embodiment of the present application. As shown in FIG7 , the downlink beam management device 40 may include: a receiving module 41 .

[0188] Among them, the receiving module 41 is used to receive N first signals sent by the network side device, and the first signal is used to determine the target beam of the target downlink transmission, where N is a positive integer; wherein the first signal includes at least one of the following: the first SSB; the first downlink signal.

[0189] An embodiment of the present application provides a downlink beam management device, which can receive at least one of the first SSB and the first downlink signal sent by the network side device to determine the beam of the downlink transmission. By introducing the downlink beam management signal, downlink beam management can be performed in a non-RRC connection state, thereby ensuring the performance of the downlink transmission during the random access process.

[0190] In a possible implementation, the N first signals are associated with at least one of the following:

[0191] a second SSB, the second SSB being different from the first SSB;

[0192] RO;

[0193] Random access preamble;

[0194] The second signal is an uplink signal.

[0195] In one possible implementation, the N first signals are associated with the second SSB, including at least one of the following:

[0196] N first signals are associated with one second SSB;

[0197] The beam reference source of the N first signals is a second SSB.

[0198] In a possible implementation, the N first signals are associated with at least one of the RO and the preamble, including at least one of the following:

[0199] The N first signals correspond to N preamble codes or a group of N preamble codes;

[0200] N first signals correspond to N ROs or groups of N ROs;

[0201] The N first signals correspond to X preamble codes or groups of preamble codes, and Y ROs or groups of ROs, where X and Y are both positive integers.

[0202] In one possible implementation, the N first signals are associated with the second signal, including any one of the following:

[0203] An index association between the N first signals and the M second signals, where M is a positive integer;

[0204] The first set to which the N first signals belong is associated with the second set to which the M second signals belong. The first set or the second set includes at least one of the following: a resource set, a resource subset, a resource group, or a resource list.

[0205] In one possible implementation, the M second signals are associated with a second SSB, where M is a positive integer;

[0206] Alternatively, the M second signals are associated with at least one of a preamble and an RO.

[0207] In one possible implementation, the target downlink transmission includes at least one of the following:

[0208] Transmission of the downlink channel of Msg2;

[0209] Transmission of the downlink channel of MsgB;

[0210] Transmission of the downlink channel of Msg4;

[0211] Any other downlink channel transmission in idle or inactive state.

[0212] In one possible implementation, as shown in FIG8 in combination with FIG7 , the downlink beam management device 40 involved in the embodiment of the present application further includes: a sending module 42. The sending module 42 is configured to, after the above-mentioned receiving module 41 receives N first signals sent by the network-side device, indicate one or more target beams to the network-side device through first information or second information, where the second information is associated with the first signal; wherein the first information includes at least one of the following: MAC CE signaling, Msg3, MsgA PUSCH; and the second information includes at least one of the following: RO, random access preamble, and second signal, where the second signal is an uplink signal.

[0213] In a possible implementation manner, for the first PDCCH, a beam transmitting the first PDCCH is a target beam indicated by the second information;

[0214] The first PDCCH is the PDCCH in Msg2 or MsgB.

[0215] In a possible implementation manner, for the first PDSCH, the beam transmitting the first PDSCH is the target beam indicated by the second information, or the beam transmitting the first PDSCH is the first beam indicated in the DCI scheduling the first PDSCH;

[0216] The first PDSCH is the PDSCH in Msg2 or MsgB.

[0217] In a possible implementation, the DCI includes a field for indicating the first beam;

[0218] The above domains satisfy at least one of the following:

[0219] The domain indicates an index of the first signal, where the first signal corresponds to the first beam;

[0220] There is an association between the domain and the preamble index of random access.

[0221] In a possible implementation, the beam for transmitting the first PDSCH is the target beam indicated by the second information or the first beam indicated in the DCI, and is determined by the third information;

[0222] The third information includes at least one of the following:

[0223] a scheduling interval between the DCI scheduling the first PDSCH and the first PDSCH;

[0224] the number of the first signal;

[0225] The format type of the random access preamble.

[0226] In a possible implementation, for the second PDCCH, the beam transmitting the second PDCCH is the target beam indicated by the second information, or the beam transmitting the second PDCCH is the second beam indicated by the RAR message;

[0227] Among them, the second PDCCH is the PDCCH in Msg4.

[0228] In a possible implementation, for the second PDSCH, the beam transmitting the second PDSCH is the target beam indicated by the second information, or the beam transmitting the second PDSCH is the third beam indicated by the DCI scheduling the second PDSCH, or the beam transmitting the second PDSCH is the same as the beam transmitting the PDSCH of Msg2;

[0229] Among them, the second PDSCH is the PDSCH in Msg4.

[0230] In a possible implementation, for other downlink channels, the beam transmitting the other downlink channels is the target beam indicated by the second information; or, the beam transmitting the other downlink channels is a fourth beam indicated by an RAR message, DCI, or MAC CE signaling;

[0231] Among them, other downlink channels are downlink channels except the downlink channels of Msg2, MsgB and Msg4.

[0232] In one possible implementation, when retransmission, reselection, or repeated transmission occurs in the target downlink transmission, the terminal and the network-side device agree by default to determine the beam of the target downlink transmission by a first method, where the first method includes any one of the following:

[0233] Using downlink beams other than the target beam used for the previous target downlink transmission;

[0234] According to the order of the multiple target beams determined by the first method, the next beam after the target beam used for the previous target downlink transmission is adopted;

[0235] Continue to use the target beam used for the previous target downlink transmission.

[0236] In a possible implementation, the receiving module 41 is further configured to receive a first message sent by a network-side device, where the first message is used to configure or indicate at least one of the configuration information of the first signal and the configuration information of the second signal;

[0237] The first message is any one of the following: MIB, SI, RRC release message, RAR message, DCI, MAC CE signaling.

[0238] In one possible implementation, the configuration information of the first signal includes at least one of the following:

[0239] An association relationship between the first signal and fourth information, the fourth information including at least one of the following: a second SSB, a preamble, and an RO;

[0240] transmission time-frequency resources of the first signal;

[0241] the number of the first signal;

[0242] a sequence of first signals;

[0243] port information of the first signal;

[0244] a period of the first signal;

[0245] The correlation relationship between the first signal and the second signal.

[0246] In one possible implementation, the configuration information of the second signal includes at least one of the following:

[0247] transmission time-frequency resources of the second signal;

[0248] the number of second signals;

[0249] a sequence of a second signal;

[0250] port information of the second signal;

[0251] a period of the second signal;

[0252] an association relationship between the second signal and the first signal;

[0253] The association relationship between the second signal and the fourth information, where the fourth information includes at least one of the following: a second SSB, a preamble code, and an RO.

[0254] In a possible implementation, the fifth information of the N first signals is determined by the terminal through the second SSB;

[0255] The fifth information includes at least one of the following: transmission time-frequency resources, transmission period, index, and port information.

[0256] The downlink beam management device in the embodiments of the present application can be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or chip. The electronic device can be a terminal or other device other than a terminal. For example, the terminal can include but is not limited to the types of terminal 11 listed above, and other devices can be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiments of the present application.

[0257] The downlink beam management device provided in the embodiment of the present application can implement the various processes implemented in the above-mentioned downlink beam management method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0258] FIG9 shows a possible structural diagram of a downlink beam management device involved in an embodiment of the present application. As shown in FIG9 , the downlink beam management device 50 may include: a sending module 51 .

[0259] Among them, the sending module 51 is used to send N first signals to the terminal, and the first signal is used to determine the target beam of the target downlink transmission, where N is a positive integer; wherein the first signal includes at least one of the following: the first SSB; the first downlink signal.

[0260] An embodiment of the present application provides a downlink beam management device, which can send at least one of a first SSB and a first downlink signal to a terminal to determine the beam of downlink transmission. By introducing a downlink beam management signal, downlink beam management can be performed in a non-RRC connection state, thereby ensuring the performance of downlink transmission during random access.

[0261] In a possible implementation, the N first signals are associated with at least one of the following:

[0262] a second SSB, the second SSB being different from the first SSB;

[0263] RO;

[0264] Random access preamble;

[0265] The second signal is an uplink signal.

[0266] In one possible implementation, the N first signals are associated with the second SSB, including at least one of the following:

[0267] N first signals are associated with one second SSB;

[0268] The beam reference source of the N first signals is a second SSB.

[0269] In a possible implementation, the N first signals are associated with at least one of the RO and the preamble, including at least one of the following:

[0270] The N first signals correspond to N preamble codes or a group of N preamble codes;

[0271] N first signals correspond to N ROs or groups of N ROs;

[0272] The N first signals correspond to X preamble codes or groups of preamble codes, and Y ROs or groups of ROs, where X and Y are both positive integers.

[0273] In one possible implementation, the N first signals are associated with the second signal, including any one of the following:

[0274] An index association between the N first signals and the M second signals, where M is a positive integer;

[0275] The first set to which the N first signals belong is associated with the second set to which the M second signals belong. The first set or the second set includes at least one of the following: a resource set, a resource subset, a resource group, or a resource list.

[0276] In one possible implementation, the M second signals are associated with a second SSB, where M is a positive integer;

[0277] Alternatively, the M second signals are associated with at least one of a preamble and an RO.

[0278] In one possible implementation, the target downlink transmission includes at least one of the following:

[0279] Transmission of the downlink channel of Msg2;

[0280] Transmission of the downlink channel of MsgB;

[0281] Transmission of the downlink channel of Msg4;

[0282] Any other downlink channel transmission in idle or inactive state.

[0283] In one possible implementation, as shown in FIG10 in combination with FIG9 , the downlink beam management device 50 provided in an embodiment of the present application further includes: a determination module 52. The determination module 52 is configured to determine one or more target beams after the sending module 51 sends N first signals to the terminal, where the one or more target beams are indicated by the terminal through first information or second information, where the second information is associated with the first signal;

[0284] The first information includes at least one of the following: MAC CE signaling, Msg3, MsgA PUSCH; the second information includes at least one of the following: RO, a preamble code of random access, and a second signal, where the second signal is an uplink signal.

[0285] In a possible implementation, for the first PDCCH, the network-side device determines, through the second information, a target beam as a beam for transmitting the first PDCCH;

[0286] The first PDCCH is the PDCCH in Msg2 or MsgB.

[0287] In a possible implementation, for the first PDSCH, the network side device determines, through the second information, a target beam as the beam for transmitting the first PDSCH, or the network side device indicates, through the DCI for scheduling the first PDSCH, the first beam as the beam for transmitting the first PDSCH;

[0288] The first PDSCH is the PDSCH in Msg2 or MsgB.

[0289] In a possible implementation, the DCI includes a field for indicating the first beam;

[0290] The above domains satisfy at least one of the following:

[0291] The domain indicates the index of the first signal, where the first signal corresponds to the first beam;

[0292] There is an association between the domain and the preamble index of random access.

[0293] In a possible implementation, the beam for transmitting the first PDSCH is a target beam determined by the second information or a first beam indicated in the DCI, and is determined by third information;

[0294] The third information includes at least one of the following:

[0295] a scheduling interval between the DCI scheduling the first PDSCH and the first PDSCH;

[0296] the number of the first signal;

[0297] The format type of the random access preamble.

[0298] In a possible implementation, for the second PDCCH, the network side device determines, through the second information, the target beam as the beam for transmitting the second PDCCH, or the network side device indicates, through an RAR message, the second beam as the beam for transmitting the second PDCCH;

[0299] Among them, the second PDCCH is the PDCCH in Msg4.

[0300] In a possible implementation, for the second PDSCH, the network side device determines the target beam as the beam for transmitting the second PDSCH through the second information, or the network side device indicates the third beam as the beam for transmitting the second PDSCH through the DCI that schedules the second PDSCH, or the beam for transmitting the second PDSCH by the network side device is the same as the beam for transmitting the PDSCH for Msg2;

[0301] Among them, the second PDSCH is the PDSCH in Msg4.

[0302] In one possible implementation, for other downlink channels, the network side device determines, through the second information, a target beam as a beam for transmitting the other downlink channels; or, the network side device indicates, through an RAR message, DCI, or MAC CE signaling, a beam for transmitting the other downlink channels;

[0303] Among them, other downlink channels are downlink channels except the downlink channels of Msg2, MsgB and Msg4.

[0304] In one possible implementation, when retransmission, reselection, or repeated transmission occurs in the target downlink transmission, the network side device and the terminal agree by default to determine the beam of the target downlink transmission by a first method, where the first method includes any one of the following:

[0305] Using downlink beams other than the target beam used for the previous target downlink transmission;

[0306] According to the order of the multiple target beams determined by the first method, the next beam after the target beam used for the previous target downlink transmission is adopted;

[0307] Continue to use the target beam used for the previous target downlink transmission.

[0308] In a possible implementation, the sending module 51 is further configured to send a first message to the terminal, where the first message is used to configure or indicate at least one of the configuration information of the first signal and the configuration information of the second signal;

[0309] The first message is any one of the following: MIB, SI, RRC release message, RAR message, DCI, MAC CE signaling.

[0310] In one possible implementation, the configuration information of the first signal includes at least one of the following:

[0311] An association relationship between the first signal and fourth information, the fourth information including at least one of the following: a second SSB, a preamble, and an RO;

[0312] transmission time-frequency resources of the first signal;

[0313] the number of the first signal;

[0314] a sequence of first signals;

[0315] port information of the first signal;

[0316] a period of the first signal;

[0317] The correlation relationship between the first signal and the second signal.

[0318] In one possible implementation, the configuration information of the second signal includes at least one of the following:

[0319] transmission time-frequency resources of the second signal;

[0320] the number of second signals;

[0321] a sequence of a second signal;

[0322] port information of the second signal;

[0323] a period of the second signal;

[0324] an association relationship between the second signal and the first signal;

[0325] The association relationship between the second signal and the fourth information, where the fourth information includes at least one of the following: a second SSB, a preamble code, and an RO.

[0326] The downlink beam management device provided in the embodiment of the present application can implement the various processes implemented in the above-mentioned downlink beam management method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0327] As shown in Figure 11, an embodiment of the present application further provides a communication device 5000, including a processor 5001 and a memory 5002, wherein the memory 5002 stores a program or instruction that can be run on the processor 5001. For example, when the communication device 5000 is the above-mentioned terminal, the program or instruction, when executed by the processor 5001, implements the various steps of the above-mentioned terminal-side method embodiment, and can achieve the same technical effect. To avoid repetition, it is not repeated here. When the communication device 5000 is the above-mentioned network-side device, the program or instruction, when executed by the processor 5001, implements the various steps of the above-mentioned network-side device-side method embodiment, and can achieve the same technical effect. To avoid repetition, it is not repeated here.

[0328] The present application also provides a terminal comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps in the above-described method embodiment. This terminal embodiment corresponds to the above-described terminal-side method embodiment, and each implementation process and implementation method of the above-described method embodiment can be applied to this terminal embodiment and achieve the same technical effect. Specifically, Figure 12 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application.

[0329] The terminal 7000 includes but is not limited to: a radio frequency unit 7001, a network module 7002, an audio output unit 7003, an input unit 7004, a sensor 7005, a display unit 7006, a user input unit 7007, an interface unit 7008, a memory 7009 and at least some of the components of the processor 7010.

[0330] Those skilled in the art will appreciate that the terminal 7000 may also include a power supply (such as a battery) to power various components. The power supply may be logically connected to the processor 7010 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The terminal structure shown in FIG12 does not limit the terminal. The terminal may include more or fewer components than shown, or may combine certain components, or have different component arrangements, which will not be described in detail here.

[0331] It should be understood that in an embodiment of the present application, the input unit 7004 may include a graphics processing unit (GPU) 70041 and a microphone 70042, and the graphics processor 70041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 7006 may include a display panel 70061, and the display panel 70061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 7007 includes a touch panel 70071 and at least one of other input devices 70072. The touch panel 70071 is also called a touch screen. The touch panel 70071 may include two parts: a touch detection device and a touch controller. Other input devices 70072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and an operating stick, which will not be repeated here.

[0332] In the embodiment of the present application, after receiving downlink data from a network-side device, the RF unit 7001 may transmit the data to the processor 7010 for processing. Furthermore, the RF unit 7001 may send uplink data to the network-side device. Typically, the RF unit 7001 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0333] The memory 7009 can be used to store software programs or instructions and various data. The memory 7009 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, applications or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 7009 may include a volatile memory or a non-volatile memory. 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), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM), and a direct memory bus random access memory (DRRAM). The memory 7009 in the embodiment of the present application includes, but is not limited to, these and any other suitable types of memory.

[0334] The processor 7010 may include one or more processing units. Optionally, the processor 7010 integrates an application processor and a modem processor. The application processor primarily handles operations related to the operating system, user interface, and application programs, while the modem processor primarily processes wireless communication signals, such as a baseband processor. It is understood that the modem processor may not be integrated into the processor 7010.

[0335] The terminal provided in the embodiment of the present application can implement the various processes implemented in the above method embodiment and achieve the same technical effect. The implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the above downlink beam management method embodiment. To avoid repetition, it will not be repeated here.

[0336] The present application also provides a network-side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps of the above-described method embodiment. This network-side device embodiment corresponds to the above-described network-side device method embodiment, and each implementation process and implementation method of the above-described method embodiment are applicable to this network-side device embodiment and can achieve the same technical effects.

[0337] Specifically, embodiments of the present application also provide a network-side device. As shown in Figure 13, the network-side device 600 includes an antenna 61, a radio frequency device 62, a baseband device 63, a processor 64, and a memory 65. Antenna 61 is connected to radio frequency device 62. In the uplink direction, radio frequency device 62 receives information via antenna 61 and sends the received information to baseband device 63 for processing. In the downlink direction, baseband device 63 processes the information to be transmitted and sends it to radio frequency device 62. Radio frequency device 62 processes the received information and then sends it through antenna 61.

[0338] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 63 , which includes a baseband processor.

[0339] The baseband device 63 may include, for example, at least one baseband board, on which multiple chips are arranged, as shown in Figure 13, one of the chips is, for example, a baseband processor, which is connected to the memory 65 through a bus interface to call the program in the memory 65 and execute the network device operations shown in the above method embodiment.

[0340] The network side device may further include a network interface 66, which is, for example, a Common Public Radio Interface (CPRI).

[0341] Specifically, the network side device 600 of an embodiment of the present invention also includes: instructions or programs stored in the memory 65 and executable on the processor 64. The processor 64 calls the instructions or programs in the memory 65 to execute the methods executed by the modules shown in the above-mentioned downlink beam management device and achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0342] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned downlink beam management method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0343] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0344] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned downlink beam management method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0345] 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.

[0346] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the above-mentioned downlink beam management method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0347] An embodiment of the present application also provides a communication system, including: a terminal and a network side device, wherein the terminal can be used to execute the steps of the downlink beam management method as described above, and the network side device can be used to execute the steps of the downlink beam management method as described above.

[0348] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0349] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for enabling a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0350] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A downlink beam management method, comprising: The terminal receives N first signals sent by the network side device, where the first signals are used to determine a target beam for target downlink transmission, where N is a positive integer; Wherein, the first signal includes at least one of the following: A first synchronization signal block SSB; The first downlink signal.

2. The method according to claim 1, wherein: The N first signals are associated with at least one of the following: a second SSB, the second SSB being different from the first SSB; Random access channel opportunity RO; Random access preamble; The second signal is an uplink signal.

3. The method according to claim 2, wherein: The N first signals are associated with the second SSB, including at least one of the following: The N first signals are associated with one second SSB; The beam reference source of the N first signals is one of the second SSBs.

4. The method according to claim 2 or 3, wherein: The N first signals are associated with at least one of the RO and the preamble, and include at least one of the following: The N first signals correspond to the N preamble codes or a group of the N preamble codes; The N first signals correspond to N ROs or groups of N ROs; The N first signals correspond to X preamble codes or groups of the preamble codes, and Y ROs or groups of the ROs, where X and Y are both positive integers.

5. The method according to any one of claims 2 to 4, wherein: The N first signals are associated with the second signal, including any one of the following: An index association between the N first signals and the M second signals, where M is a positive integer; The first set to which the N first signals belong is associated with the second set to which the M second signals belong, and the first set or the second set includes at least one of the following: a resource set, a resource subset, a resource group, and a resource list.

6. The method according to claim 5, wherein: M second signals are associated with the second SSB, where M is a positive integer; Alternatively, the M second signals are associated with at least one of the preamble and the RO.

7. The method according to any one of claims 1 to 6, wherein: The target downlink transmission includes at least one of the following: Transmission of the downlink channel of Msg2; Transmission of the downlink channel of MsgB; Transmission of the downlink channel of Msg4; Transmission on any other downlink channel in idle or inactive state.

8. The method according to any one of claims 1 to 7, wherein: After the terminal receives N first signals sent by the network side device, the method further includes: The terminal indicates one or more target beams to the network side device through first information or second information, where the second information is associated with the first signal; Among them, the first information includes at least one of the following: media access control-control unit MAC CE signaling, Msg3, MsgA physical uplink shared channel PUSCH; the second information includes at least one of the following: RO, random access preamble, second signal, and the second signal is an uplink signal.

9. The method according to claim 8, wherein: For a first physical downlink control channel PDCCH, a beam for transmitting the first PDCCH is the target beam indicated by the second information; The first PDCCH is a PDCCH in Msg2 or MsgB.

10. The method according to claim 8, wherein: For a first physical downlink shared channel PDSCH, a beam for transmitting the first PDSCH is the target beam indicated by the second information, or a beam for transmitting the first PDSCH is a first beam indicated in downlink control information DCI for scheduling the first PDSCH; The first PDSCH is a PDSCH in Msg2 or MsgB.

11. The method according to claim 10, wherein: The DCI includes a field for indicating the first beam; The domain satisfies at least one of the following: The domain indicates an index of the first signal, the first signal corresponding to the first beam; The domain is associated with the preamble index of random access.

12. The method according to claim 10 or 11, wherein: The beam for transmitting the first PDSCH is the target beam indicated by the second information or the first beam indicated in the DCI, and is determined by third information; The third information includes at least one of the following: a scheduling interval between the DCI for scheduling the first PDSCH and the first PDSCH; the number of the first signals; The format type of the random access preamble.

13. The method according to claim 8, wherein: For the second PDCCH, the beam for transmitting the second PDCCH is the target beam indicated by the second information, or the beam for transmitting the second PDCCH is the second beam indicated by a random access response RAR message; The second PDCCH is the PDCCH in Msg4.

14. The method according to claim 8, wherein: For the second PDSCH, the beam for transmitting the second PDSCH is the target beam indicated by the second information, or the beam for transmitting the second PDSCH is the third beam indicated by the DCI for scheduling the second PDSCH, or the beam for transmitting the second PDSCH is the same as the beam for transmitting the PDSCH of Msg2; Among them, the second PDSCH is the PDSCH in Msg4.

15. The method according to claim 8, wherein: For other downlink channels, the beam for transmitting the other downlink channels is the target beam indicated by the second information; or, the beam for transmitting the other downlink channels is a fourth beam indicated by a RAR message, a DCI or a MAC CE signaling; The other downlink channels are downlink channels other than the downlink channels of Msg2, MsgB and Msg4.

16. The method according to any one of claims 8 to 15, wherein: In the case where retransmission, reselection or repeated transmission occurs in the target downlink transmission, the terminal and the network side device agree by default to determine the beam of the target downlink transmission by a first method, and the first method includes any one of the following: Using other downlink beams other than the target beam used for the target downlink transmission described above; According to the order of the multiple target beams determined by the first method, the next beam of the target beam used for the previous target downlink transmission is adopted; Continue to use the target beam used for the target downlink transmission described above.

17. The method according to any one of claims 2 to 16, wherein: The method further comprises: The terminal receives a first message sent by the network side device, where the first message is used to configure or indicate at least one of configuration information of the first signal and configuration information of the second signal; The first message is any one of the following: master information block MIB, system information SI, radio resource control RRC release message, RAR message, DCI, MAC CE signaling.

18. The method according to claim 17, wherein: The configuration information of the first signal includes at least one of the following: The association relationship between the first signal and fourth information, the fourth information comprising at least one of the following: the second SSB, the preamble, and the RO; transmission time-frequency resources of the first signal; the number of the first signals; a sequence of the first signal; port information of the first signal; a period of the first signal; The association relationship between the first signal and the second signal.

19. The method according to claim 17 or 18, wherein: The configuration information of the second signal includes at least one of the following: transmission time-frequency resources of the second signal; the number of the second signals; a sequence of the second signal; port information of the second signal; a period of the second signal; an association relationship between the second signal and the first signal; The association relationship between the second signal and fourth information, the fourth information includes at least one of the following: the second SSB, the preamble code, and the RO.

20. The method according to any one of claims 2 to 19, wherein: The fifth information of the N first signals is determined by the terminal through the second SSB; The fifth information includes at least one of the following: transmission time and frequency resources, transmission period, index, and port information.

21. A downlink beam management method, comprising: The network side device sends N first signals to the terminal, where the first signals are used to determine a target beam for target downlink transmission, where N is a positive integer; Wherein, the first signal includes at least one of the following: First SSB; The first downlink signal.

22. The method according to claim 21, wherein: The N first signals are associated with at least one of the following: a second SSB, the second SSB being different from the first SSB; RO; Random access preamble; The second signal is an uplink signal.

23. The method according to claim 22, wherein: The N first signals are associated with the second SSB, including at least one of the following: The N first signals are associated with one second SSB; The beam reference source of the N first signals is one of the second SSBs.

24. The method according to claim 22 or 23, wherein: The N first signals are associated with at least one of the RO and the preamble, and include at least one of the following: The N first signals correspond to the N preamble codes or a group of the N preamble codes; The N first signals correspond to N ROs or groups of N ROs; The N first signals correspond to X preamble codes or groups of the preamble codes, and Y ROs or groups of the ROs, where X and Y are both positive integers.

25. The method according to any one of claims 22 to 24, wherein: The N first signals are associated with the second signal, including any one of the following: An index association between the N first signals and the M second signals, where M is a positive integer; The first set to which the N first signals belong is associated with the second set to which the M second signals belong, and the first set or the second set includes at least one of the following: a resource set, a resource subset, a resource group, and a resource list.

26. The method according to claim 25, wherein: M second signals are associated with the second SSB, where M is a positive integer; Alternatively, the M second signals are associated with at least one of the preamble and the RO.

27. The method according to any one of claims 21 to 26, wherein: The target downlink transmission includes at least one of the following: Transmission of the downlink channel of Msg2; Transmission of the downlink channel of MsgB; Transmission of the downlink channel of Msg4; Transmission on any other downlink channel in idle or inactive state.

28. The method according to any one of claims 21 to 27, wherein: After the network side device sends N first signals to the terminal, the method further includes: The network-side device determines one or more target beams, where the one or more target beams are indicated by the terminal through first information or second information, where the second information is associated with the first signal; The first information includes at least one of the following: MAC CE signaling, Msg3, MsgA PUSCH; the second information includes at least one of the following: RO, a random access preamble, a second signal, and the second signal is an uplink signal.

29. The method according to claim 28, wherein: For the first PDCCH, the network side device determines, through the second information, the target beam as the beam for transmitting the first PDCCH; The first PDCCH is a PDCCH in Msg2 or MsgB.

30. The method of claim 28, wherein: For the first PDSCH, the network side device determines, through the second information, the target beam as the beam for transmitting the first PDSCH, or, the network side device indicates, through the DCI for scheduling the first PDSCH, the first beam as the beam for transmitting the first PDSCH; The first PDSCH is a PDSCH in Msg2 or MsgB.

31. The method according to claim 30, wherein: The DCI includes a field for indicating the first beam; The domain satisfies at least one of the following: The domain indicates an index of the first signal, the first signal corresponding to the first beam; The domain is associated with the preamble index of random access.

32. The method according to claim 30 or 31, wherein: The beam for transmitting the first PDSCH is the target beam determined by the second information or the first beam indicated in the DCI, and is determined by third information; The third information includes at least one of the following: a scheduling interval between the DCI for scheduling the first PDSCH and the first PDSCH; the number of the first signals; The format type of the random access preamble.

33. The method of claim 28, wherein: For the second PDCCH, the network side device determines, through the second information, the target beam as the beam for transmitting the second PDCCH, or, the network side device indicates, through a RAR message, the second beam as the beam for transmitting the second PDCCH; The second PDCCH is the PDCCH in Msg4.

34. The method of claim 28, wherein: For the second PDSCH, the network side device determines the target beam as the beam for transmitting the second PDSCH through the second information, or the network side device indicates the third beam as the beam for transmitting the second PDSCH through the DCI for scheduling the second PDSCH, or the beam for transmitting the second PDSCH by the network side device is the same as the beam for transmitting the PDSCH for Msg2; Among them, the second PDSCH is the PDSCH in Msg4.

35. The method of claim 28, wherein: For other downlink channels, the network side device determines the target beam as the beam for transmitting the other downlink channels through the second information; or, the network side device indicates the beam for transmitting the other downlink channels through a RAR message, a DCI or a MAC CE signaling; The other downlink channels are downlink channels other than the downlink channels of Msg2, MsgB and Msg4.

36. A method according to any one of claims 28 to 35, wherein: In the case where retransmission, reselection or repeated transmission occurs in the target downlink transmission, the network side device and the terminal agree by default to determine the beam of the target downlink transmission by a first method, and the first method includes any one of the following: Using other downlink beams other than the target beam used for the target downlink transmission described above; According to the order of the multiple target beams determined by the first method, the next beam of the target beam used for the previous target downlink transmission is adopted; Continue to use the target beam used for the target downlink transmission described above.

37. The method according to any one of claims 22 to 36, wherein: The method further comprises: The network side device sends a first message to the terminal, where the first message is used to configure or indicate at least one of the configuration information of the first signal and the configuration information of the second signal; The first message is any one of the following: MIB, SI, RRC release message, RAR message, DCI, MAC CE signaling.

38. The method of claim 37, wherein: The configuration information of the first signal includes at least one of the following: The association relationship between the first signal and fourth information, the fourth information comprising at least one of the following: the second SSB, the preamble, and the RO; transmission time-frequency resources of the first signal; the number of the first signals; a sequence of the first signal; port information of the first signal; a period of the first signal; The association relationship between the first signal and the second signal.

39. The method according to claim 37 or 38, wherein: The configuration information of the second signal includes at least one of the following: transmission time-frequency resources of the second signal; the number of the second signals; a sequence of the second signal; port information of the second signal; a period of the second signal; an association relationship between the second signal and the first signal; The association relationship between the second signal and fourth information, the fourth information includes at least one of the following: the second SSB, the preamble code, and the RO.

40. A downlink beam management device, comprising: Receiver module; The receiving module is used to receive N first signals sent by the network side device, where the first signals are used to determine a target beam for target downlink transmission, where N is a positive integer; Wherein, the first signal includes at least one of the following: First SSB; The first downlink signal.

41. A downlink beam management device, comprising: Send module; The sending module is used to send N first signals to the terminal, where the first signals are used to determine a target beam for target downlink transmission, and N is a positive integer; Wherein, the first signal includes at least one of the following: First SSB; The first downlink signal.

42. A terminal comprises a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the steps of the downlink beam management method as described in any one of claims 1 to 20 are implemented.

43. A network side device, comprising a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the downlink beam management method as described in any one of claims 21 to 39 are implemented.

44. A readable storage medium storing a program or instruction, wherein the program or instruction, when executed by a processor, implements the downlink beam management method as described in any one of claims 1 to 20, or implements the steps of the downlink beam management method as described in any one of claims 21 to 39.

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