Downlink tci state determination method and apparatus, terminal and network-side device

Abstract

The application discloses a downlink TCI state determination method and device, a terminal and a network side equipment, and belongs to the technical field of communication. The downlink TCI state determination method comprises the following steps: a terminal acquires common beam information indicated by a network side equipment, wherein the common beam information comprises N first transmission configuration indication (TCI) states, the first TCI state is a joint TCI state or an independent downlink (DL) TCI state, and N is an integer greater than or equal to 1; and the terminal determines a target TCI state of a target downlink channel according to target information.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to a downlink TCI state determination method, apparatus, terminal, and network-side equipment. Background Technology

[0002] In multi-transmission reception point (mTRP) scenarios, the beam information for various channels is based on a scheme prior to the unified Transmission Configuration Indicator (TCI) framework in 3GPP Release 17 (R17). This means that network-side equipment needs to use the corresponding beam indication scheme for each channel to indicate its TCI state, so that the terminal can use the TCI state indicated by the network-side equipment to determine which beam to use for transmission. This increases the complexity of the beam indication process for each channel. Summary of the Invention

[0003] This application provides a downlink TCI state determination method, apparatus, terminal, and network-side device. By indicating a shared TCI state for different downlink channels, the beam indication process for each downlink channel can be simplified.

[0004] Firstly, a downlink TCI state determination method is provided for application in a terminal. This method includes:

[0005] The terminal obtains common beam information indicated by the network-side device. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DL TCI state, and N is an integer greater than or equal to 1.

[0006] The terminal determines the target TCI state of the target downlink channel based on the target information, wherein the target information includes at least one of the following:

[0007] The number of the first TCI states;

[0008] The order or position of the first TCI states;

[0009] The correspondence between the first TCI state and the first identification information;

[0010] The type of the target downlink channel;

[0011] The transmission mode of the target downlink channel;

[0012] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0013] The number of the first identification information corresponding to the target downlink channel;

[0014] The value of the first identifier information corresponding to the target downlink channel;

[0015] The first identification information includes at least one of the following:

[0016] Control resource set CORESET identification information;

[0017] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0018] The identification information of the CORESET where the interrelated SSs are located;

[0019] The transmission timing information or transmission time information of the interconnected SS;

[0020] CORESET pool identification CORESETPoolIndex;

[0021] Send the TRP identifier ID information of the receiving point;

[0022] Channel group identification information;

[0023] CORESET group identification information;

[0024] Physical uplink control channel (PUCCH) resource group identification information.

[0025] Secondly, a downlink TCI status determination device is provided for use in a terminal, the device comprising:

[0026] The first acquisition module is used to acquire common beam information indicated by the network-side device. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DLTCI state, and N is an integer greater than or equal to 1.

[0027] The first determining module is used to determine the target TCI state of the target downlink channel based on target information, wherein the target information includes at least one of the following:

[0028] The number of the first TCI states;

[0029] The order or position of the first TCI states;

[0030] The correspondence between the first TCI state and the first identification information;

[0031] The type of the target downlink channel;

[0032] The transmission mode of the target downlink channel;

[0033] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0034] The number of the first identification information corresponding to the target downlink channel;

[0035] The value of the first identifier information corresponding to the target downlink channel;

[0036] The first identification information includes at least one of the following:

[0037] Control resource set CORESET identification information;

[0038] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0039] The identification information of the CORESET where the interrelated SSs are located;

[0040] The transmission timing information or transmission time information of the interconnected SS;

[0041] CORESET pool identification CORESETPoolIndex;

[0042] Send the TRP identifier ID information of the receiving point;

[0043] Channel group identification information;

[0044] CORESET group identification information;

[0045] Physical uplink control channel (PUCCH) resource group identification information.

[0046] Thirdly, a downlink TCI state determination method is provided, applied to network-side devices, the method comprising:

[0047] The first acquisition module is used to acquire common beam information indicated by the network-side device. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DLTCI state, and N is an integer greater than or equal to 1.

[0048] The first determining module is used to determine the target TCI state of the target downlink channel based on target information, wherein the target information includes at least one of the following:

[0049] The number of the first TCI states;

[0050] The order or position of the first TCI states;

[0051] The correspondence between the first TCI state and the first identification information;

[0052] The type of the target downlink channel;

[0053] The transmission mode of the target downlink channel;

[0054] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0055] The number of the first identification information corresponding to the target downlink channel;

[0056] The value of the first identifier information corresponding to the target downlink channel;

[0057] The first identification information includes at least one of the following:

[0058] Control resource set CORESET identification information;

[0059] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0060] The identification information of the CORESET where the interrelated SSs are located;

[0061] The transmission timing information or transmission time information of the interconnected SS;

[0062] CORESET pool identification CORESETPoolIndex;

[0063] Send the TRP identifier ID information of the receiving point;

[0064] Channel group identification information;

[0065] CORESET group identification information;

[0066] Physical uplink control channel (PUCCH) resource group identification information.

[0067] Fourthly, a downlink TCI state determination device is provided, applied to network-side equipment, the device comprising:

[0068] The indication module is used to indicate common beam information to the terminal. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DL TCI state, and N is an integer greater than or equal to 1.

[0069] The second determining module is used to determine the target TCI state of the target downlink channel based on the target information, wherein the target information includes at least one of the following:

[0070] The number of the first TCI states;

[0071] The order or position of the first TCI states;

[0072] The correspondence between the first TCI state and the first identification information;

[0073] The type of the target downlink channel;

[0074] The transmission mode of the target downlink channel;

[0075] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0076] The number of the first identification information corresponding to the target downlink channel;

[0077] The value of the first identifier information corresponding to the target downlink channel;

[0078] The first identification information includes at least one of the following:

[0079] Control resource set CORESET identification information;

[0080] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0081] The identification information of the CORESET where the interrelated SSs are located;

[0082] The transmission timing information or transmission time information of the interconnected SS;

[0083] CORESET pool identification CORESETPoolIndex;

[0084] Send the TRP identifier ID information of the receiving point;

[0085] Channel group identification information;

[0086] CORESET group identification information;

[0087] Physical uplink control channel (PUCCH) resource group identification information.

[0088] Fifthly, a terminal is provided, the terminal including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first aspect.

[0089] Sixthly, a terminal is provided, including a processor and a communication interface, wherein the communication interface is used to acquire common beam information indicated by a network-side device, the common beam information including N first transmission configuration indication (TCI) states, the first TCI states being either joint TCI states or independent downlink DL TCI states, and N being an integer greater than or equal to 1; the processor is used to determine the target TCI state of a target downlink channel based on target information, the target information including at least one of the following:

[0090] The number of the first TCI states;

[0091] The order or position of the first TCI states;

[0092] The correspondence between the first TCI state and the first identification information;

[0093] The type of the target downlink channel;

[0094] The transmission mode of the target downlink channel;

[0095] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0096] The number of the first identification information corresponding to the target downlink channel;

[0097] The value of the first identifier information corresponding to the target downlink channel;

[0098] The first identification information includes at least one of the following:

[0099] Control resource set CORESET identification information;

[0100] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0101] The identification information of the CORESET where the interrelated SSs are located;

[0102] The transmission timing information or transmission time information of the interconnected SS;

[0103] CORESET pool identification CORESETPoolIndex;

[0104] Send the TRP identifier ID information of the receiving point;

[0105] Channel group identification information;

[0106] CORESET group identification information;

[0107] Physical uplink control channel (PUCCH) resource group identification information.

[0108] In a seventh aspect, a network-side device is provided, the network-side device including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the third aspect.

[0109] Eighthly, a network-side device is provided, including a processor and a communication interface, wherein the communication interface is used to indicate common beam information to a terminal, the common beam information including N first transmission configuration indication (TCI) states, the first TCI states being either joint TCI states or independent downlink DL TCI states, and N being an integer greater than or equal to 1; the processor is used to determine the target TCI state of a target downlink channel based on target information, the target information including at least one of the following:

[0110] The number of the first TCI states;

[0111] The order or position of the first TCI states;

[0112] The correspondence between the first TCI state and the first identification information;

[0113] The type of the target downlink channel;

[0114] The transmission mode of the target downlink channel;

[0115] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0116] The number of the first identification information corresponding to the target downlink channel;

[0117] The value of the first identifier information corresponding to the target downlink channel;

[0118] The first identification information includes at least one of the following:

[0119] Control resource set CORESET identification information;

[0120] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0121] The identification information of the CORESET where the interrelated SSs are located;

[0122] The transmission timing information or transmission time information of the interconnected SS;

[0123] CORESET pool identification CORESETPoolIndex;

[0124] Send the TRP identifier ID information of the receiving point;

[0125] Channel group identification information;

[0126] CORESET group identification information;

[0127] Physical uplink control channel (PUCCH) resource group identification information.

[0128] A ninth aspect provides a wireless communication system, comprising: a terminal and a network-side device, wherein the terminal is configured to perform the steps of the downlink TCI state determination method as described in the first aspect, and the network-side device is configured to perform the steps of the downlink TCI state determination method as described in the third aspect.

[0129] In a tenth aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect, or implement the steps of the method described in the third aspect.

[0130] Eleventhly, a chip is provided, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being 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 third aspect.

[0131] In a 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 TCI state determination method as described in the first aspect, or to implement the steps of the downlink TCI state determination method as described in the third aspect.

[0132] In this embodiment, the terminal obtains common beam information that can be shared or used by various channels, as indicated by the network-side device. Even in a multi-transmitter-receiver (TRP) scenario, the terminal can determine the target TCI status of various downlink channels based on the target information, without having to indicate the target TCI status of each channel according to the TCI status indication process corresponding to each channel. This embodiment can use a unified TCI status indication framework in a multi-TRP scenario, thereby simplifying the complexity of the TCI status indication or beam indication process for each downlink channel. Attached Figure Description

[0133] Figure 1 This is a schematic diagram of the structure of a wireless communication system that can be applied to the embodiments of this application;

[0134] Figure 2 This is a flowchart of a downlink TCI status determination method provided in an embodiment of this application;

[0135] Figure 3 This is a flowchart of another downlink TCI status determination method provided in an embodiment of this application;

[0136] Figure 4 This is a schematic diagram of the structure of a downlink TCI status determination device provided in an embodiment of this application;

[0137] Figure 5 This is a schematic diagram of another downlink TCI status determination device provided in an embodiment of this application;

[0138] Figure 6 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0139] Figure 7 This is a schematic diagram of the hardware structure of a terminal provided in an embodiment of this application;

[0140] Figure 8 This is a schematic diagram of the structure of a network-side device provided in an embodiment of this application. Detailed Implementation

[0141] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0142] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0143] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, 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), and other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and NR terminology is used in most of the following description; however, these technologies can also be applied to applications beyond NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0144] Figure 1This diagram illustrates a block diagram of a wireless communication system applicable to embodiments of this application. The wireless communication system includes a terminal 11 and a network-side device 12. Terminal 11 can be a mobile phone, tablet computer, laptop computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, vehicle-mounted device (VUE), pedestrian terminal (PUE), smart home (home devices with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), game console, personal computer (PC), ATM, or self-service machine, etc. Wearable devices include: smartwatches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. It should be noted that the specific type of terminal 11 is not limited in this embodiment. Network-side equipment 12 may include access network equipment or core network equipment. Access network equipment 12 may also be referred to as radio access network equipment, radio access network (RAN), radio access network function, or radio access network unit. Access network equipment 12 may include base stations, WLAN access points, or WiFi nodes, etc. Base stations may be referred to as Node B, evolved Node B (eNB), access point, base transceiver station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), home B node, home evolved B node, Transmitting Receiving Point (TRP), or any other suitable term in the field, as long as the same technical effect is achieved. The base station is not limited to specific technical terms. It should be noted that in this application embodiment, only a base station in an NR system is used as an example for description, and the specific type of base station is not limited.

[0145] The following description, in conjunction with the accompanying drawings, details the downlink TCI state determination method, downlink TCI state determination device, terminal, and network-side equipment provided in this application through some embodiments and application scenarios.

[0146] In wireless communication, after beam measurement and beam reporting, network-side equipment can perform beam indication on downlink and uplink channels or reference signals to establish beam links between network-side equipment and user equipment (UE, hereinafter referred to as terminal) and realize the transmission of channels or reference signals.

[0147] It should be noted that the beam information in the embodiments of this application may include at least one of the following: beam identification information, spatial relation information, spatial domain transmission filter information, spatial domain reception filter information, spatial filter information, transmission configuration indication status (TCI status) information, quasi-colocation (QCL) information, and QCL parameters. Downlink beam information can typically be represented using TCI status information or QCL information. Uplink beam information can typically be represented using TCI status information or spatial relation information.

[0148] In related technologies, each channel or reference signal has its own beam indication mechanism:

[0149] 1) For beam indication of the Physical Downlink Control Channel (PDCCH): The network-side equipment uses Radio Resource Control (RRC) signaling to configure K TCI states for each Control Resource Set (CORESET). When K > 1, the Medium Access Control (MAC) Control Element (CE) indicates or activates one TCI state. When K = 1, no additional MAC CE signaling is required. When the UE is listening to the PDCCH, it uses the same QCL (i.e., the same TCI state) for all Search Spaces (SS) within the CORESET. The reference signals (e.g., Channel State Information Reference Signal (CSI-RS) resources, semi-persistent CSI-RS resources, Synchronization Signal Blocks (SSBs)) in this TCI state share the same spatial QCL as the demodulation reference signal (DMRS) port of the UE-specific PDCCH. Based on this TCI state, the UE can determine which receive beam to use to receive the PDCCH.

[0150] 2) For beam indication of the Physical Downlink Shared Channel (PDSCH): The network-side equipment configures M TCI states via RRC signaling, then activates the corresponding TCI states for up to 8 codepoints using MAC CE signaling. The TCI states are then notified via the 3-bit TCI field of the Downlink Control Information (DCI). The reference signal in this TCI state is QCL with the DMRS port of the PDSCH to be scheduled. The UE can determine which receive beam to use to receive the PDSCH based on this TCI state.

[0151] 3) CSI-RS Beam Indication: When the CSI-RS type is periodic CSI-RS, the network-side device configures the QCL information for the CSI-RS resource via RRC signaling. When the CSI-RS type is semi-persistent CSI-RS, the network-side device indicates its QCL information when activating a CSI-RS resource from the RRC-configured CSI-RS resource set via MACCE signaling. When the CSI-RS type is aperiodic CSI-RS, the network-side device configures the QCL for the CSI-RS resource via RRC signaling and uses DCI to trigger the CSI-RS.

[0152] 4) Beam indication for the Physical Uplink Control Channel (PUCCH): Network-side equipment uses RRC signaling to configure spatial relation information for each PUCCH resource via the parameter "PUCCH-SpatialRelationInfo". When multiple spatial relation information items are configured for a PUCCH resource, MAC CE is used to indicate or activate one of the spatial relation information items. When only one spatial relation information item is configured for a PUCCH resource, no additional MAC CE signaling is required.

[0153] 5) Beam indication for Physical Uplink Shared Channel (PUSCH): The spatial relation information of PUSCH is determined by each SRI codepoint in the Sounding Reference Signal (SRS) resource indicator (SRI) field of the DCI when the PDCCH schedules the PUSCH. This SRI is used to indicate the spatial relation information of the PUSCH.

[0154] 6) For SRS beam indication: When the SRS type is periodic SRS, the network-side device configures spatial relation information for the SRS resource via RRC signaling. When the SRS type is semi-persistent SRS, the network-side device activates the spatial relation information via MAC CE signaling. When the SRS type is aperiodic SRS, the network-side device configures spatial relation information for the SRS resource via RRC signaling, and can update it via MAC CE signaling.

[0155] As can be seen from the above, in related technologies, based on different types of channel or reference signal resources, it is necessary to indicate the target TCI state of the channel or reference signal resource through the beam indication process corresponding to that channel or reference signal resource. It can be seen that the beam indication process is relatively complex.

[0156] To simplify the beam indication process, a new TCI framework, known as the unified TCI framework, was introduced in Release 17 of the 3rd Generation Partnership Project (3GPP) for 5G NR. This framework allows network-side devices to use the same beam indicated by MAC CE and / or DCI for transmission on multiple channels; this beam can also be called a common beam. The beam indication process of this unified TCI framework is as follows:

[0157] Network-side devices configure a TCI state pool via RRC signaling and activate one or more TCI states within that pool using MAC CE signaling. When MAC CE activates a TCI state corresponding to a single codepoint, the activated TCI state is directly applied to the target signal. When MAC CE activates TCI states corresponding to multiple codepoints, the network-side device then uses the TCI field in the DCI to indicate a codepoint, and the TCI state corresponding to that codepoint is applied to the target signal.

[0158] Within the unified TCI framework, TCI can include two modes: joint TCI state and separate TCI state. These modes are configured by the RRC signaling of the network-side equipment. For joint TCI state, each codepoint corresponds to one TCI state; for separate TCI state, each codepoint can correspond to one downlink (DL) TCI state and one uplink (UL) TCI state, or one DL TCI state, or one UL TCI state.

[0159] For the source RS of the TCI state, there are two cases:

[0160] 1) DL: CSI-RS for beam management, CSI-RS for tracking;

[0161] 2) UL: SSB, CSI-RS for beam management, CSI-RS for tracking, SRS for beam management.

[0162] For the target signal in the TCI state, there are two cases:

[0163] 1) DL: UE-dedicated reception on PDSCH, UE-dedicated reception on all or subset of CORESETs, aperiodic CSI-RS resources for CSI, aperiodic CSI-RS resources for Beam Management (BM), DMRS(s) associated with non-UE-dedicated reception on CORESET(s) and the associated PDSCH(associated with the serving cell PCI).

[0164] 2) UL: PUSCH based on dynamic grant / configured grant, all of dedicated PUCCH resources, aperiodic SRS resources or resource sets for BM, SRS for antenna switching, SRS for codebook, and SRS for non-codebook.

[0165] In implementation, when network-side devices use DCI for beam indication, both DCI format 1_1 / 1_2 with DL allocation and DCI format 1_1 / 1_2 without DL allocation are supported.

[0166] The beam application time for the TCI state indicated by the Beam Indication DCI is defined as follows: the first slot to apply the indicated TCI is at least Y symbols after the last symbol of the acknowledgment of the joint or separate DL / UL beam indication.

[0167] The path loss (PLRS) in the power control parameters is configured by the network-side equipment within or associated with the TCI state. Other power control parameters (such as P0, alpha, and close loop index configurations) are configured by the network-side equipment and associated with the TCI state. For PUCCH, PUSCH, and SRS, there are their own parameter settings associated with the TCI state, or they are included in the configuration information of each channel.

[0168] For Carrier Aggregation (CA) scenarios, the network indicates common QCL information and / or common UL TX spatial filter(s) across a set of configured component carriers (CCs).

[0169] It should be noted that although the unified TCI framework was proposed in 3GPP R17, it is only applicable to single-TRP (sTRP) scenarios and not to multi-TRP (mTRP) transmissions introduced in 3GPP R16. In other words, there is currently no solution for applying the unified TCI framework to the downlink channel in mTRP scenarios. This application, however, proposes a solution that allows the application of the unified TCI framework to the downlink channel in mTRP scenarios.

[0170] Please see Figure 2The downlink TCI status determination method provided in this application embodiment can be executed by a terminal, which can be, for example, a terminal... Figure 1 The various terminals listed in the document, including 11 or other types of terminals, are not specifically limited here. For example... Figure 2 As shown, the downlink TCI status determination method may include the following steps:

[0171] Step 201: The terminal obtains the common beam information indicated by the network-side device. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DL TCI state, and N is an integer greater than or equal to 1.

[0172] In implementation, the aforementioned first TCI state can be understood as an active TCI state that can be shared by each downlink channel, reference signal resource, or reference signal resource set in the mTRP scenario. For example, the network-side device configures the TCI state pool through RRC signaling and activates the TCI state corresponding to one or at least two codepoints using MAC CE signaling. When the number of codepoints corresponding to the activated TCI state is greater than one, the network-side device then uses the TCI field in DCI to indicate at least some of the activated TCI states as the first TCI state.

[0173] In a multi-TRP scenario, a network-side device can be understood as having at least two TRPs, and these different TRPs can include the same and / or different beams. During transmission, the network-side device can communicate with the terminal via one or more of these at least two TRPs.

[0174] In practice, the number of the first TCI states can usually be two. Of course, it may also be one or more than two. For ease of explanation, the following embodiments typically use two first TCI states as a typical example for illustration, which does not constitute a specific limitation.

[0175] Step 202: The terminal determines the target TCI state of the target downlink channel based on the target information.

[0176] The target information includes at least one of the following:

[0177] The number of the first TCI states;

[0178] The order or position of the first TCI states;

[0179] The correspondence between the first TCI state and the first identification information;

[0180] The type of the target downlink channel (e.g., PDSCH, PDCCH, DL RS resources, etc.);

[0181] The transmission mode of the target downlink channel;

[0182] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0183] The number of the first identification information corresponding to the target downlink channel;

[0184] The value of the first identifier information corresponding to the target downlink channel;

[0185] The first identification information includes at least one of the following:

[0186] Control resource set CORESET identification information;

[0187] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0188] The identification information of the CORESET where the interrelated SSs are located;

[0189] The transmission timing information or transmission time information of the interconnected SS;

[0190] CORESET pool identification CORESETPoolIndex;

[0191] Send the TRP identifier ID information of the receiving point;

[0192] Channel group identification information;

[0193] CORESET group identification information;

[0194] Physical Uplink Control Channel (PUCCH) resource group identification information.

[0195] In implementation, the number of first TCI states can be one or at least two. For example, in a scenario where the network-side device has N TRPs, the network-side device can indicate N first TCI states. Furthermore, the first TCI state can be a combined TCI state or an independent DL TCI state; no specific limitation is made here.

[0196] In addition, the types of the aforementioned target downlink channels may include: Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), DL RS resources, PDCCH on the first CORESET, channels scheduled or triggered by PDCCH on the first CORESET, and channels associated with the first CORESET.

[0197] The first CORESET includes at least one of the following: CORESET#0, CORESET associated only with the Common Search Space (CSS), CORESET associated only with the UE-specific Search Space (USS), and CORESET associated with both USS and CSS.

[0198] The PDCCH includes at least one of the following:

[0199] All PDCCHs, PDCCHs on the terminal-specific control resource set CORESET, PDCCHs on the CORESET associated only with USS, PDCCHs on the CORESET associated only with CSS, PDCCHs on the CORESET associated with both USS and the common search space CSS, and PDCCHs on all other CORESETs except CORESET#0;

[0200] And / or,

[0201] The PDSCH includes at least one of the following:

[0202] The PDSCH scheduled by the PDCCH, the PDSCH associated with the PDCCH, and the PDSCH dedicated to the terminal.

[0203] Furthermore, the transmission modes of the aforementioned target downlink channel may include: repetition transmission mode, multi-beam simultaneous transmission (e.g., Single Frequency Network (SFN) transmission, Frequency Division Multiplex (FDM) transmission / Space Division Multiplex (SDM) transmission, etc.), preset transmission mode (i.e., single-beam transmission mode without repetition), or a transmission mode that dynamically switches between the preset transmission mode, the repetition transmission mode, and the multi-beam simultaneous transmission mode.

[0204] It should be noted that, for ease of explanation, the mode of simultaneous transmission of multiple beams is referred to as SFN transmission mode in the following embodiments, which does not constitute a specific limitation.

[0205] In practice, depending on the type and / or transmission mode of the target downlink channel, the number and type of TCI states required by the target downlink channel may change. Thus, there may be situations where the number of first TCI states indicated by the network-side device is greater than, less than or equal to the number of TCI states required by the target downlink channel.

[0206] Option 1: In determining the target TCI state of the target downlink channel based on the number of the first TCI states, the decision on whether to update the TCI state of the target downlink channel and which TCI states to update can be made based on whether the number of the first TCI states is greater than or equal to the number of TCI states required by the target downlink channel. For example, when the number of the first TCI states is greater than or equal to K, where K is the number of TCI states required by the target downlink channel, at least K first TCI states can be used to determine the beam information of the target downlink channel (i.e., update all TCI states of the target downlink channel); when the number of the first TCI states is less than K, the target downlink channel can use its original TCI states (i.e., do not update the TCI state of the target downlink channel), or the target downlink channel can use some of its original TCI states and the first TCI states (i.e., update some TCI states of the target downlink channel). Of course, when the number of the first TCI states is less than K, it can also be determined that the target downlink channel stops transmitting, or the transmission mode of the target downlink channel is switched to a transmission mode that matches the number of the first TCI states (e.g., assuming the number of the first TCI states is equal to 1, and the transmission mode of the target downlink channel is: a mode of repeated transmission using 2 TCI states, or a mode of simultaneous transmission of multiple beams in FDM, SDM, or SFN, then the terminal can determine that the configuration of the repeated transmission mode or the mode of simultaneous transmission of multiple beams is invalid, thereby changing the transmission mode of the target downlink channel to a single beam transmission mode that only uses 1 TCI state).

[0207] Option 2: In the process of determining the target TCI state of the target downlink channel according to the arrangement order or position of the first TCI state, the first TCI state arranged in a preset position (such as the first position, the second position, etc.) can be determined as the target TCI state of the target downlink channel. For example, when the number of the first TCI states is at least 2, and the target downlink channel needs to use 2 TCI states, the first TCI state arranged in the first and second positions can be determined as the target TCI state of the target downlink channel.

[0208] In implementation, when a network-side device activates or indicates a first TCI state, the device indicates the TCI state by activating or indicating a TCI code point. This TCI code point can correspond to one or more sequentially arranged TCI states. Thus, when a TCI code point corresponds to multiple TCI states, each TCI state has its own arrangement order or position.

[0209] Option 3: In determining the target TCI state of the target downlink channel based on the correspondence between the first TCI state and the first identification information, the first TCI state corresponding to the preset first identification information can be determined as the target TCI state of the target downlink channel. For example, the first TCI state corresponding to a preset value (which can be the smallest value) CORESETPoolIndex can be determined as the target TCI state of the target downlink channel.

[0210] Option 4: In determining the target TCI state of the target downlink channel based on its type, for different types of target downlink channels, the target TCI state can be determined according to the TCI state associated with that channel type. For example, the target TCI state of the PDSCH or DL ​​RS resource can be determined based on the TCI state of the PDCCH that schedules or triggers the PDSCH or DL ​​RS resource. Alternatively, given that repeatedly transmitted PDCCHs can have interrelated search spaces (SS), the TCI state corresponding to the identification information of the interrelated SSs, the identification information of the CORESET where the interrelated SSs are located, or the transmission timing information or transmission time information of the interrelated SSs can be determined as the target TCI state of the repeatedly transmitted PDCCH.

[0211] Option 5: In the process of determining the target TCI state of the target downlink channel according to the transmission mode of the target downlink channel, the number of TCI states required for the target downlink channel can be determined according to the transmission mode of the target downlink channel, thereby determining the number of target TCI states.

[0212] Optionally, before the terminal determines the target TCI state of the target downlink channel based on the target information, the method further includes:

[0213] The terminal receives third indication information from the network-side device and determines the transmission mode of the target downlink channel based on the third indication information. The transmission mode includes: a preset transmission mode, a repeated transmission mode, a multi-beam simultaneous transmission mode, or a transmission mode that dynamically switches between the preset transmission mode, the repeated transmission mode, and the multi-beam simultaneous transmission mode. The preset transmission mode is a single-beam transmission without repeated transmission.

[0214] In this embodiment, the network-side device can indicate the transmission mode of the target downlink channel. Further, the third indication information can be used to indicate the transmission mode of the target downlink channel, or the third indication information can be used to indicate the number of target TCI states. The third indication information indicating the number of target TCI states can be understood as indirectly indicating the transmission mode of the target downlink channel. For example, the network-side device can use indication signaling for each PDCCH resource or PDCCH resource group to indicate various transmission modes, such as single TCI state transmission, multi-TCI state transmission, or dynamic switching of the number of TCI states. This indication signaling can be: explicitly indicating various transmission modes through RRC, MAC CE, or DCI signaling, or indirectly indicating various transmission modes through the number of TCI states indicated by RRC, MAC CE, or DCI signaling. For example: if the RRC is configured with a repetition count greater than 1, it is a multi-TCI state transmission; if the MAC CE activates a codepoint corresponding to multiple TCI states, it is a multi-TCI state transmission; if the DCI indicates one or more TCI states, it enables dynamic switching between single-TCI state transmission and multi-TCI state transmission.

[0215] Optionally, if the terminal uses single-beam transmission, and the number of the first TCI states is one, then the terminal determines the transmission mode of the target downlink channel as single-beam transmission (i.e., the target downlink channel directly uses the one first TCI state for single-beam transmission); or,

[0216] When the terminal uses single-beam transmission, if the number of the first TCI states is at least two, then the terminal determines the transmission mode of the target downlink channel as single-beam transmission (i.e., the target downlink channel uses one of the at least two first TCI states for single-beam transmission), repeated transmission mode, or multi-beam simultaneous transmission mode (i.e., the target downlink channel uses at least two or all of the at least two first TCI states for repeated transmission or multi-beam simultaneous transmission); or,

[0217] When the terminal adopts a repetitive transmission mode or a multi-beam simultaneous transmission mode, if the number of the first TCI states is one, the terminal determines the transmission mode of the target downlink channel as either single-beam transmission (i.e., the target downlink channel directly uses the one first TCI state for non-repetitive single-beam transmission) or the repetitive transmission mode (i.e., the target downlink channel directly uses the one first TCI state for continued repetitive transmission, or the target downlink channel uses at least two existing TCI states for repetitive transmission, or the target downlink channel uses some existing TCI states and the one first TCI state for repetitive transmission) or the multi-beam simultaneous transmission mode (i.e., the target downlink channel uses at least two existing TCI states for multi-beam simultaneous transmission, or the target downlink channel uses some existing TCI states and the one first TCI state for multi-beam simultaneous transmission); or,

[0218] When the terminal adopts a repetitive transmission mode or a multi-beam simultaneous transmission mode, if the number of the first TCI states is at least two, the terminal determines that the transmission mode of the target downlink channel is the repetitive transmission mode or the multi-beam simultaneous transmission mode (that is, the target downlink channel uses at least two or all of the at least two first TCI states for repetitive transmission or multi-beam simultaneous transmission).

[0219] Option 6: In determining the target TCI state of the target downlink channel based on the time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel, it is possible to distinguish whether the time-domain behavior of the target downlink channel is periodic or aperiodic, or to distinguish whether the time-domain behavior of the information it carries is periodic or aperiodic. Thus, different target TCI states can be adopted for periodic downlink channels and aperiodic downlink channels, or different target TCI states can be adopted for downlink channels carrying periodic information and downlink channels carrying aperiodic information.

[0220] Optionally, if the target downlink channel has a periodic time-domain behavior or the carried information has a periodic time-domain behavior, the target TCI state includes at least one of the following:

[0221] Other TCI states in the TCI state pool besides the first TCI state, or the original TCI state of the target downlink channel;

[0222] The first TCI state corresponding to the first identifier information associated with the target downlink channel;

[0223] The first TCI state indicated by the first indication information from the network-side device;

[0224] First preset TCI state;

[0225] The first preset TCI state includes at least one of the following:

[0226] The first TCI states arranged in preset positions among all the first TCI states;

[0227] The first TCI state corresponding to the preset first identifier information.

[0228] The aforementioned first indication information may be RRC signaling sent by the network-side device. For example, the first indication information may be located in RRC signaling carrying the configuration information of the target downlink channel, or the first indication information may be included in the configuration information of the target downlink channel. Of course, the first indication information may also be carried in any form of signaling such as newly added RRC signaling, MAC CE, or DCI signaling, without specific limitations here.

[0229] It should be noted that when the target downlink channel is a PDSCH or DL ​​RS resource, and the PDSCH or DL ​​RS is aperiodic, the target TCI state can be the TCI state of the PDCCH that schedules the PDSCH or DL ​​RS resource.

[0230] Option 7: In the process of determining the target TCI state of the target downlink channel based on the number of the first identification information corresponding to the target downlink channel, the transmission mode of the target downlink channel can be determined based on the number of the first identification information corresponding to the target downlink channel. For example, for a PDCCH configured in SFN transmission mode, it can simultaneously correspond to two channel groups, CORESET groups, CORESETPoolIndex, or TRP IDs, etc. In this case, the two TCI states indicated by the network-side device and corresponding to two first identification information can be applied to the SFN PDCCH.

[0231] Option 8: In the process of determining the target TCI state of the target downlink channel based on the value of the first identification information corresponding to the target downlink channel, the TCI state corresponding to the value of the first identification information can be determined according to the correspondence between the first identification information and the TCI state.

[0232] In implementation, options one through eight can be combined with each other. That is, the terminal can determine the target TCI state based on one or at least two of options one through eight. For example, if the first TCI state indicated by the network-side device can meet the requirements of the target downlink channel for the number of TCI states, channel type, and associated first identification information, the terminal can select K TCI states from the first TCI states indicated by the network-side device as the target TCI states, where K is the number of TCI states required by the target downlink channel.

[0233] As an optional implementation, when the number of the first TCI states is greater than K, where K is the number of TCI states required by the target downlink channel, the terminal determines the target TCI state of the target downlink channel based on the target information, including:

[0234] The terminal determines the K first TCI states arranged in preset positions as the target TCI states of the target downlink channel; or...

[0235] The terminal determines the target TCI state of the target downlink channel based on the instruction of the second instruction information from the network-side device, wherein the second instruction information is used to indicate K first TCI states.

[0236] The K first TCI states arranged in preset positions can be understood as follows: after at least two first TCI states indicated by the network-side device are arranged in a preset order, the preset position of each first TCI state is determined according to the arrangement position of each first TCI state, or each first TCI state is identified by its respective preset position.

[0237] In this way, the terminal can determine the preset position according to the default rules. For example, the TCI state of the preset position can be determined as the first TCI state in the sequence. Of course, in practice, the network-side device can also indicate the preset position to the terminal. After determining the preset position, the first TCI state corresponding to the preset position can be determined.

[0238] In practice, the preset order or position of the above TCI states can be determined according to the order or position of multiple TCI states corresponding to the TCI codepoint when the MAC CE activates the TCI state, or when the DCI indicates the TCI state. No specific limitation is made here.

[0239] Furthermore, the terminal determines the target TCI state of the target downlink channel based on the second indication information from the network-side device. This can be understood as the terminal receiving the second indication information from the network-side device to enable the network-side device to indicate to the terminal which TCI state(s) its target downlink channel specifically uses.

[0240] It should be noted that when the target TCI state includes at least two first TCI states, the aforementioned second indication information can not only indicate which two first TCI states are present, but also which first TCI state each of the two TCI states of the target downlink channel corresponds to. For example: assuming there are two first TCI states, and the target downlink channel adopts a repetition transmission mode, if the second indication information is 00, the first of the two first TCI states can be selected for the repetition transmission of the target downlink channel; if the second indication information is 01, the second of the two first TCI states can be selected for the repetition transmission of the target downlink channel; if the second indication information is 10, the first of the two first TCI states is selected as the first TCI state used for the repetition transmission of the target downlink channel, and the second of the two first TCI states is selected as the second TCI state used for the repetition transmission of the target downlink channel; if the second indication information is 11, the second of the two first TCI states is selected as the first TCI state used for the repetition transmission of the target downlink channel, and the first of the two first TCI states is selected as the second TCI state used for the repetition transmission of the target downlink channel.

[0241] In this embodiment, compared to the embodiment in which the terminal determines that the K first TCI states arranged in a preset position are the target TCI states of the target downlink channel, the network-side device can flexibly configure which one or more TCI states the terminal's target downlink channel specifically uses.

[0242] Optionally, the second indication information is carried in a first signaling field, which is a signaling field in the Media Access Control (MAC) Controller (CE) signaling or DCI signaling.

[0243] In one implementation, the first signaling field may be a signaling field in MAC CE signaling used to activate the first TCI state or spatial relation information.

[0244] In another implementation, the first signaling field may also be a signaling field in DCI signaling used to indicate the first TCI state.

[0245] In implementation, the first signaling domain can be applied to DCI format 1_1 or DCI format 1_2.

[0246] In this implementation, the second indication information can be carried using the signaling fields newly added in the existing MAC CE signaling or DCI signaling, which can reduce signaling overhead.

[0247] It should be noted that, in implementation, the first signaling domain can be configured to exist or be effective only when the second indication information is required. In other non-essential situations, the first signaling domain may not be configured, or it may be configured but ineffective. For example, the first signaling domain may become effective or exist when preset conditions are met, and these preset conditions include at least one of the following:

[0248] The network-side device is configured with the first signaling domain;

[0249] The network-side device indicates at least two first TCI states via DCI signaling;

[0250] Among the TCI code points activated by the network-side device through the Media Access Control (MAC) control unit (CE), at least one code point corresponds to at least two TCI states.

[0251] In this embodiment, the decision to configure the first signaling domain or whether the configuration of the first signaling domain is effective can be determined by judging preset conditions. In this way, the terminal will only detect the second indication information carried in the first signaling domain when the first signaling domain is configured and effective, which can reduce the terminal's computing power and resource consumption.

[0252] Of course, in practice, there may be situations where the first TCI state indicated by the network-side device cannot meet the requirements of the target downlink channel for the number, type, and associated first identification information of TCI states. In this case, the terminal determines the target TCI state of the target downlink channel based on the target information, which may include at least one of the following: the terminal may determine that the target downlink channel adopts the original TCI state (i.e., does not update the TCI state of the target downlink channel), or only updates one or a part of the original TCI states of the target downlink channel to the first TCI state, or stops transmitting the target downlink channel according to the original configuration information of the target downlink channel (e.g., repeated transmission or SFN transmission), etc.

[0253] As an optional implementation, if the target downlink channel has M TCI states, and the number of the first TCI states is at least M, then the target TCI state is at least M of the first TCI states, where M is an integer greater than or equal to 2; or,

[0254] If the target downlink channel has M TCI states, and N is less than M, then the target TCI state is the original M TCI states of the target downlink channel; or, the target TCI state is the original (MN) TCI states of the target downlink channel and the N first TCI states; or, the target TCI state is the N first TCI states; or...

[0255] If the target downlink channel has one TCI state, and the number of the first TCI states is at least one, then the target TCI state is at least one first TCI state.

[0256] Wherein, in the case that the target downlink channel has M TCI states, if N is less than M, then the target TCI state is the original M TCI states of the target downlink channel, and the TCI state of the target downlink channel may not be updated.

[0257] In the case where the target downlink channel has M TCI states, if N is less than M, the target TCI state is the original (MN) TCI states of the target downlink channel and the N first TCI states. It can be that only N TCI states of the original M TCI states of the target downlink channel are updated, while the remaining (MN) TCI states are not updated.

[0258] In the case where the target downlink channel has M TCI states, if N is less than M, the target TCI state is the N first TCI states. This can be because when the target downlink channel is transmitted using two downlink TCI states (e.g., repetition transmission or SFN transmission), if the number of first TCI states is 1, it can be determined that the repetition configuration or SFN configuration has failed. Thus, one first TCI state can be used to continue the repetition transmission of the target downlink channel, or one first TCI state can be used to transmit the target downlink channel, or the transmission of the target downlink channel can be stopped.

[0259] As an optional implementation, if the number of the first TCI states is greater than 1, and if the target downlink channel type is PDCCH and the transmission mode is repetitive transmission mode, then the target TCI state includes at least one of the following:

[0260] The first TCI state corresponding to the first SS, which is the same as the first identification information of the first SS, wherein the first SS is at least one of the two mutually associated SSs in which the target downlink channel is located; or,

[0261] All of the first TCI states, wherein each first TCI state is applied to the target downlink channel transmitted on the interrelated SS according to the correspondence between the first TCI state and the first identification information.

[0262] In this embodiment, the target downlink channel adopts a repetition mode, which can be: CORESET#0, CORESET associated only with CSS, CORESET associated only with USS, CORESET associated with both USS and CSS, PDCCH on such CORESET and other channels repetitions scheduled by it.

[0263] In practice, when the target downlink channel is PDCCH, if the PDCCH repetition occurs, the network-side device can configure the two SS sets containing the PDCCH to be associated with each other.

[0264] In practice, multi-TRP transmission can be divided into two cases based on control signaling: single DCI scheduling (sDCI) and multi-DCI scheduling (mDCI).

[0265] Multi-DCI (mDCI) scheduling: Each TRP sends its own PDCCH, and each PDCCH schedules its own PDSCH. In this case, multiple CORESETs configured for the UE are associated with different RRC parameters, CORESETPoolIndex, to correspond to different TRPs. The PDSCHs scheduled by two TRPs can completely overlap, partially overlap, or not overlap, but the PUSCHs scheduled by two TRPs cannot overlap.

[0266] Single DCI (sDCI) scheduling: A PDCCH is scheduled by one TRP, and multiple CORESETs configured for the UE cannot be associated with different CORESETPoolIndexes. In this case, MAC CE activates a maximum of 8 codepoints, at least one of which corresponds to two TCI states. When a codepoint indicated by a TCI field in a DCI corresponds to two TCI states and indicates that one TCI state contains "QCL-TypeD", it means that the scheduled PDSCH comes from two TRPs. This PDSCH includes various transmission schemes, such as: data from different layers of the PDSCH corresponding to two TCI states (Scheme 1a, Space Division Multiplexing (SDM)); or data on different frequency domain subcarriers corresponding to two TCI states (Schemes 2a / 2b, Frequency Division Multiplexing (FDM)); or each time domain repetition comes from different TRPs (Schemes 3 / 4, Time Division Multiplexing (TDM)). The specific transmission scheme of the PDSCH is determined by other means, such as through higher-layer parameter configuration or by indicating the number of DMRS code domain multiplexing (CDM) groups through DCI, which will not be elaborated here.

[0267] It is worth mentioning that, among the relevant technologies, 3GPP R17 supports the PDCCH repetition transmission scheme in the mTRP scenario, and this scheme can only be applied in sDCI scheduling.

[0268] Specifically, in the beam indication scheme for PDCCH repetition transmission in the mTRP scenario, the network-side device explicitly configures the two search space sets (SS sets) where the PDCCH resides to be associated with each other via RRC signaling. These associated SS sets can be associated with the same CORESET or different CORESETs. Furthermore, there is no restriction on whether the TCI states of the CORESETs associated with the two associated SS sets are the same.

[0269] Furthermore, the beam indication scheme for PDCCH repetition transmission in the above mTRP scenario also has the following limitations:

[0270] The UE does not expect the third monitored SS set to be associated with either of the two aforementioned associated SS sets;

[0271] Two related SS sets have the same period, offset, duration, number of monitoring occurrences, AL, etc.

[0272] The nth monitoring occasion of one SS set is associated with the nth monitoring occasion of another SS set, and the two PDCCH candidates have the same candidate index.

[0273] Inter-slot PDCCH repetition is not supported.

[0274] The above SS set can only be USS and Type 3 CSS;

[0275] The SS set configured by the RRC parameter "recoverySearchSpaceId" is not associated with other SS sets.

[0276] In this embodiment of the application, the PDCCH repetition transmission scheme in the mTRP scenario can be applied to sDCI scheduling and mDCI scheduling.

[0277] Optionally, in multi-DCI mode, the CORESETs of the at least two interconnected SSs are located in different CORESETPoolIndexes; in single-DCI mode, the at least two interconnected SSs correspond to different first identification information.

[0278] Option 1: When using mDCI mode in an mTRP scenario (e.g., with two CORESETPoolIndex configured), configure the SSs in the CORESET corresponding to different CORESETPoolIndexes as associated. Multiple TCI states indicated by the network-side device correspond to their respective CORESETPoolIndexes (e.g., according to a preset order or position of the TCI states). In this way, when the PDCCH is transmitted on the associated SSs, it uses the TCI state corresponding to the same CORESETPoolIndex as that SS.

[0279] Option 2: In the sDCI mode of the mTRP scenario, the aforementioned first identification information can be the identifier of a channel group or a CORESET group. That is, the network-side device groups the signals or CORESETs and configures the SSs from different CORESETs to be mutually associated. Furthermore, the first TCI state indicated by the network-side device also corresponds one-to-one with the group identifier (e.g., according to a preset order or position of the TCI states, corresponding to their respective group identifiers). This allows the PDCCH transmission information (e.g., beam information) to be determined using the TCI state corresponding to the same group identifier as the SS when it is transmitted on mutually associated SSs.

[0280] In other words, before the terminal determines the target TCI state of the target downlink channel based on the first TCI state, the method further includes:

[0281] The terminal receives first configuration information from the network-side device;

[0282] The first configuration information is used to configure the SS in CORESET corresponding to different first identification information to be mutually associated.

[0283] In implementation, based on the first configuration information, the terminal can determine that the target downlink channel is a PDCCH that is repeatedly transmitted, and determine the target TCI state according to the first identification information corresponding to the mutually associated SSs. That is, the first TCI state with the same first identification as the mutually associated SS is applied to the target downlink channel transmitted on the mutually associated SS.

[0284] Option 3: The target TCI state includes all of the first TCI states. Each first TCI state is applied to the target downlink channel transmitted on interconnected SSs according to the correspondence between the first TCI states and the first identification information. This can be: at least two first TCI states indicated by the network are applied to the PDCCH transmitted on interconnected SSs according to a preset correspondence. The preset correspondence can be: the order or position of the first TCI states corresponds to the ID of the interconnected SSs; or the order or position of the first TCI states corresponds to the ID of the CORESET where the interconnected SSs are located; or the order or position of the first TCI states corresponds to the monitoring occasion / transmission time order of the interconnected SSs, etc., without specific limitations.

[0285] In this embodiment, a unifiedTCI state is provided that can be applied to sDCI scheduling and mDCI scheduling in mTRP scenarios.

[0286] As an optional implementation, when the number of the first TCI states is equal to 1, if the type of the target downlink channel is PDCCH and the transmission mode is repetitive transmission mode, then the terminal determines the target TCI state of the target downlink channel based on the target information, including at least one of the following:

[0287] The terminal determines that the retransmission configuration of the target downlink channel has failed;

[0288] The terminal determines one of at least two mutually associated SSs containing the target downlink channel to transmit the target downlink channel;

[0289] The terminal determines one of at least two CORESETs corresponding to at least two mutually associated SSs containing the target downlink channel to transmit the target downlink channel;

[0290] The terminal determines to perform repeated PDCCH transmission based on the first TCI state;

[0291] The terminal determines that the target TCI state includes at least two existing TCI states of the target downlink channel;

[0292] The terminal determines to update the second preset TCI state of the original at least two TCI states of the target downlink channel to the first TCI state; wherein the second preset TCI state corresponds to the same first identification information as the first TCI state; or the second preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the second preset TCI state is associated with the first TCI state.

[0293] In this embodiment, assuming the target downlink channel is a PDCCH in repetition transmission mode, and this repetition PDCCH originally used two TCI states, when the network indicates a first TCI state, the following approach can be adopted:

[0294] 1) The PDCCH repetition configuration is invalid, that is, repetition=1 or no longer sending the PDCCH;

[0295] 2) Transmit the PDCCH using one of the two associated SSs containing the PDCCH, or transmit the PDCCH using one of the two associated CORESETs containing the PDCCH. Here, the preset SS or preset CORESET refers to: the minimum or maximum SS ID or CORESET ID, or an SS or CORESET corresponding to a TCI state indicated by the network (e.g., a TCI state corresponds to a channel group / CORESET group / TRP ID / CORESETPoolIndex, and the preset SS or preset CORESET belongs to that channel group / CORESET group / TRP ID / CORESETPoolIndex).

[0296] 3) Continue performing PDCCH repetition using one TCI state indicated by the network;

[0297] 4) The PDCCH that performs repetition does not update the TCI state, that is, it still uses the original two TCI states;

[0298] 5) The second preset TCI state of the original two TCI states of the PDCCH for repetition is updated to a first TCI state indicated by the network-side device; wherein the second preset TCI state and the first TCI state indicated by the network-side device correspond to the same channel group / CORESET group / TRP ID / CORESETPoolIndex, or the second preset TCI state is one of the original two TCI states of the PDCCH for repetition (e.g., the first one), or the second preset TCI state and the first TCI state indicated by the network-side device have a corresponding relationship.

[0299] This embodiment solves the problem of how to determine the beam information or transmission information of a PDCCH using the repeat transmission mode when the number of first TCI states indicated by the network-side device is less than the number of TCI states configured in the PDCCH using the repeat transmission mode.

[0300] In related technologies, 3GPP R17 also supports PDCCH SFN and PDSCH SFN transmission schemes. The process of these PDCCH SFN and PDSCH SFN transmission schemes is as follows:

[0301] Network-side devices configure the SFN transmission scheme for PDCCH or PDSCH via RRC signaling. PDCCH can only be listened to on USS or Type 3 CSS.

[0302] Network-side devices can activate two TCI states via the MAC CE command, enabling PDCCH to use two beams for SFN transmission.

[0303] The SFN transmission scheme includes scheme 1 (UE advanced receiver) and pre-compensation. Specifically, SFN PDCCH (scheme 1) can schedule sTRP PDSCH (UE capability); SFN PDCCH (scheme 1, pre-compensation) can schedule SFN PDSCH (scheme 1 or pre-compensation, the two modes are scheduled one-to-one); sTRP PDCCH (only associated with USS or CSS type 3) can schedule sTRP PDSCH (legacy) or SFN PDSCH (scheme 1 + pre-compensation); and sTRP PDCCH associated with CSS or CSS + USS can schedule sTRP PDSCH. However, SFN PDCCH cannot schedule the PDSCH transmission scheme in 3GPP R16.

[0304] As an optional implementation, if the number of the first TCI states is greater than 1, and if the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, then the target TCI states include at least one of the following:

[0305] At least two first TCI states of the CORESET where the target downlink channel is located;

[0306] At least two first TCI states corresponding to at least two of the first identifier information;

[0307] At least two TCI states of the target downlink channel determined according to the order or position of the first TCI states;

[0308] All of the first TCI states;

[0309] The first TCI state corresponding to the first PDCCH, wherein the first PDCCH includes: a PDCCH that schedules the target downlink channel, or a PDCCH that schedules the target downlink channel and whose transmission mode is multi-beam simultaneous transmission mode, or any PDCCH, or any PDCCH whose transmission mode is multi-beam simultaneous transmission mode.

[0310] In implementation, the transmission mode of the aforementioned target downlink channel is a multi-beam simultaneous transmission mode, which may include at least one of the following: PDCCH SFN, PDSCH SFN, PDCCH on the first CORESET and other channel SFNs scheduled thereon, wherein the first CORESET includes at least one of the following: CORESET#0, or a CORESET associated only with CSS, or a CORESET associated with both USS and CSS.

[0311] I. For a PDCCH SFN, assuming the network-side device indicates two first TCI states, the target TCI state of the SFN PDCCH can be determined according to at least one of the following schemes:

[0312] Option 1: For a PDCCH configured in SFN transmission mode, the two TCI states of its CORESET are the two first TCI states indicated by the network-side device.

[0313] Option 2: A PDCCH configured in SFN transmission mode can simultaneously correspond to two channel groups / CORESET groups / TRPID / CORESETPoolIndex. In this case, the two first TCI states indicated by the network-side device corresponding to the two channel groups / CORESET groups / TRPID / CORESETPoolIndex can be applied to the SFN PDCCH.

[0314] Option 3: The two first TCI states indicated by the network-side device are used as the two TCI states of the SFN PDCCH according to a preset correspondence. The preset correspondence can be that the two first TCI states indicated by the network-side device have a corresponding order or position with the two TCI states of the SFN PDCCH.

[0315] Optionally, if the target TCI state includes at least two first TCI states, the method further includes:

[0316] The terminal determines the QCL parameters of the target downlink channel based on the target parameters, wherein the target parameters include all QCL parameters of the fourth preset TCI state among the at least two first TCI states, and the average delay parameter and delay spread parameter among the Class A QCL parameters of the other TCI states among the at least two first TCI states besides the fourth preset TCI state.

[0317] In this embodiment, when the PDCCH using SFN transmission mode uses two first TCI states indicated by the network-side device, the QCL parameters of type QCL-Type A associated with one of the first TCI states (i.e., other TCI states besides the fourth preset TCI state) do not need to be all referenced; instead, only the average delay and delayspread parameters are referenced. This avoids QCL parameter conflicts and improves the reliability of the QCL parameters of the PDCCH using SFN transmission mode.

[0318] The QCL sources corresponding to the two first TCI states can be two tracking reference signals (TRS) or CSI-RS.

[0319] II. For PDSCH SFN, assuming the network-side device indicates two first TCI states, the target TCI state of the SFN PDSCH can be determined according to at least one of the following schemes:

[0320] Option 1: For a PDSCH configured in SFN transmission mode, its two TCI states are the two first TCI states indicated by the network-side device.

[0321] Option 2: A PDSCH configured in SFN transmission mode can simultaneously correspond to two channel groups / CORESET groups / TRPID / CORESETPoolIndex, applying the two first TCI states indicated by the network-side device corresponding to the two channel groups / CORESET groups / TRP ID / CORESETPoolIndex to the SFN PDSCH.

[0322] Option 3: The two first TCI states indicated by the network-side device are used as the two TCI states of the SFN PDSCH according to a preset correspondence. The preset correspondence can be that the two first TCI states indicated by the network-side device have a corresponding order or position with the two TCI states of the SFNPDCCH.

[0323] Option 4: Always use the TCI state of the first PDCCH. The first PDCCH can be: the PDCCH that schedules the PDSCH, or the PDCCH that schedules the PDSCH and is also an SFN transmission, or any PDCCH, or any PDCCH that is also an SFN transmission.

[0324] In practice, if the PDCCH is an SFN transmission, the SFN PDCCH can indicate two TCI states for the SFNPDSCH.

[0325] It is worth noting that PDSCH using SFN transmission mode employs two first TCI states indicated by the network-side equipment. In one of these first TCI states, the QCL parameters of type QCL-Type A associated with the first TCI state may not be referenced in their entirety; instead, only the average delay and delay spread parameters may be referenced. The QCL sources corresponding to the two first TCI states can be two TRS or CSI-RS.

[0326] 3. When the PDCCH on the first CORESET and other channels scheduled by it adopt the SFN transmission mode, assuming that the network-side equipment indicates two first TCI states, the target TCI states of the PDCCH on the first CORESET and other channels scheduled by it can be determined in the same way as the target TCI states of the SFN PDCCH, which will not be elaborated here.

[0327] Furthermore, the PDCCH on the first CORESET and other channels it schedules may also be repetitioned. In this case, the target TCI state of the PDCCH on the first CORESET and other channels it schedules can be determined in the same way as the target TCI state of the PDCCH used to determine repetition, which will not be elaborated here.

[0328] In practice, the aforementioned first CORESET only performs repetition and SFN in intra-cell scenarios. In addition, the PDCCH on the aforementioned first CORESET and its other scheduled channels may also be in a transmission mode that does not allow repetition and SFN. In this case, the PDCCH on the first CORESET and its other scheduled channels always use only the preset TCI state from the two first TCI states indicated by the network-side equipment.

[0329] The preset TCI state can be at least one of the following:

[0330] The network-side device uses the codepoint indicated by the TCI field on the DCI to determine the first TCI state located at a preset position, such as the first TCI state arranged at the beginning.

[0331] Assuming that the network-side device indicates N joint TCI states / separate DL TCI states through the TCI field on the DCI, then the first TCI state corresponding to the preset channel group / CORESET group / TRP ID (CORESETPoolIndex) among the N joint TCI states / separate DL TCI states can be used.

[0332] The first TCI state corresponding to the channel group / CORESET group / TRP ID (CORESETPoolIndex) where the PDCCH is located in the N joint TCI states / separate DL TCI states.

[0333] It should be noted that the above-mentioned preset TCI state schemes can only be applied to intra-cell scenarios, and the network-side device can use the same TCI state as the UE-dedicated channel when configuring the PDCCH on the first CORESET and its other scheduled channels.

[0334] For inter-cell scenarios, the preset TCI state can also be the first TCI state associated with the Physical Cell Identifier (PCI) of the serving cell among the two first TCI states indicated by the network-side device. Furthermore, it can be further restricted that the PDCCH on the first CORESET and its scheduled other channels cannot perform repetition and SFN only in inter-cell scenarios.

[0335] As an optional implementation, when the number of the first TCI states is equal to 1, if the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, then the terminal determines the target TCI state of the target downlink channel based on the target information, including at least one of the following:

[0336] The terminal determines that the configuration for simultaneous multi-beam transmission of the target downlink channel has failed.

[0337] The terminal determines that the target downlink channel is transmitted based on the first TCI state.

[0338] The terminal determines that the target downlink channel is transmitted based on the first TCI state.

[0339] The terminal determines that the target TCI state includes at least two existing TCI states of the target downlink channel;

[0340] The terminal determines to update the third preset TCI state of the original at least two TCI states of the target downlink channel to the first TCI state; wherein the third preset TCI state corresponds to the same first identification information as the first TCI state; or the third preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the third preset TCI state is associated with the first TCI state.

[0341] This implementation is similar to the implementation described above regarding how to determine beam information or transmission information using a repeating transmission mode for a PDCCH when the first TCI state is a combined TCI state or an independent DL TCI state. The difference is that in this implementation, an SFN transmission mode cannot be used with a single TCI state; instead, the PDCCH is transmitted using a single first TCI state indicated by the network-side device in a conventional single-beam transmission mode. Other implementations are similar to implementations 4) and 5) above regarding how to determine beam information or transmission information using a repeating transmission mode for a PDCCH when the first TCI state is a combined TCI state or an independent DL TCI state, and will not be described again here.

[0342] As an optional implementation, when the target downlink channel type is PDCCH and the transmission mode is a preset transmission mode, the target TCI state includes a fifth preset TCI state, wherein the fifth preset TCI state includes at least one of the following:

[0343] All of the first TCI states arranged in a preset position;

[0344] The first TCI state corresponding to the preset first identifier information;

[0345] The first TCI state corresponding to the first identification information associated with the target downlink channel;

[0346] The network-side device indicates the first TCI state from all the first TCI states.

[0347] In implementation, the preset transmission mode specifically refers to a non-repetitive single-beam transmission mode. That is, the PDCCH using the preset transmission mode can be a conventional single-beam PDCCH transmission without repetition and without SFN, which can be transmitted by only one TRP.

[0348] Option 1: The first TCI states arranged in the preset positions among all the first TCI states mentioned above can be at least one first TCI state arranged in any position such as the first, second, or last position. The preset position can be determined by one or more of the following methods: protocol agreement, default to the first position, network-side device update, etc., and is not specifically limited here.

[0349] Option 2: The first identifier information mentioned above can be a preset channel group, a preset CORESET group preset TRP ID (CORESETPoolIndex), such as the first channel group, the first CORESET group, or the first TRP ID. In implementation, the first identifier information can be determined by one or more of the following methods: protocol agreement, default to the first, network-side device update, etc., without specific limitations.

[0350] Option 3: The first TCI state corresponding to the first identification information associated with the target downlink channel can be assumed to be N joint TCI states / separate DL TCI states. Then the target TCI state can be the TCI state corresponding to the channel group / CORESET group / TRP ID (CORESETPoolIndex) where the target downlink channel is located among these N joint TCI states / separate DL TCI states.

[0351] Option 4: The first TCI state indicated by the network-side device from all the first TCI states can be understood as follows: in addition to indicating at least two first TCI states, the network-side device further indicates one or at least two of the at least two first TCI states. For example, the network-side device further indicates the target TCI state among the at least two first TCI states through the aforementioned second indication information. The meaning and function of the second indication information can be referred to the explanation of the second indication information in the previous embodiments, and will not be repeated here.

[0352] In this implementation, the first TCI state in the unified TCI framework, which can be shared by multiple channels or reference signal resources, can be applied to the PDCCH using a preset transmission mode.

[0353] As an optional implementation, if the number of the first TCI states is greater than 1, and the target downlink channel type is PDSCH or DL ​​RS resource, then the target TCI state includes at least one of the following:

[0354] All of the first TCI states;

[0355] The network-side device indicates at least one first TCI state from all the first TCI states;

[0356] Sixth preset TCI state;

[0357] The sixth preset TCI state includes at least one of the following:

[0358] At least one of the first TCI state corresponding to the first code point or the first TCI state corresponding to the first code point, wherein the first code point is the code point indicated by the TCI field in the DCI indicating the first TCI state.

[0359] The first TCI state corresponding to the preset first identifier information;

[0360] The first TCI state is the same as the TCI state of the PDCCH where the DCI of the target downlink channel is located;

[0361] The first TCI state corresponding to the first identifier information associated with the PDCCH where the DCI of the target downlink channel is located;

[0362] The first TCI state corresponding to the first identifier information associated with the target downlink channel;

[0363] The first TCI state is determined based on the second code point indicated by the network-side device and is dedicated to the target downlink channel. The second code point is the code point indicated by the TCI field in the DCI that schedules the target downlink channel, and the first TCI state corresponding to the second code point is a subset or the entire set of the first TCI states corresponding to the first code point.

[0364] The same first TCI state as the PDCCH used for repeated transmission or simultaneous multi-beam transmission, or at least one of the first TCI states used for repeated transmission or simultaneous multi-beam transmission of the PDCCH, wherein the PDCCH used for repeated transmission or simultaneous multi-beam transmission is the PDCCH in which the DCI of the first TCI state is located, or the PDCCH that schedules the target downlink channel.

[0365] Option 1: The target TCI state mentioned above includes all of the first TCI states. It can be that, when the network-side device indicates N joint TCI states / separate DL TCI states, the N joint TCI states / separate DL TCI states indicated by the network-side device are always used to determine the beam information of the PDSCH or DL ​​RS resources.

[0366] Option 2: The network-side device indicating at least one first TCI state from all the first TCI states can be understood as: in addition to indicating at least two first TCI states, the network-side device further indicates one or at least two of the at least two first TCI states. For example, the network-side device further indicates the target TCI state among the at least two first TCI states through the aforementioned second indication information. The meaning and function of the second indication information can be referred to the explanation of the second indication information in the previous embodiments, and will not be repeated here.

[0367] Option 3: Use the sixth preset TCI state, which may include at least one of the following:

[0368] Used to indicate the TCI state (e.g., first TCI state) located at a preset position in the first TCI state corresponding to the first code point indicated by the TCI field on the DCI;

[0369] The first TCI state is the same as the TCI state of the PDCCH where the DCI of the target downlink channel is located;

[0370] The TCI state corresponding to the channel group / CORESET group / TRP ID (CORESETPoolIndex) of the PDCCH where the DCI of the target downlink channel is located.

[0371] Use the first TCI state corresponding to the channel group / TRP ID (CORESETPoolIndex) to which the target downlink channel belongs;

[0372] In the DCI used to schedule the target downlink channel, the TCI state corresponding to the codepoint indicated by the TCI filing is one of N TCI states. Furthermore, this TCI state is only used for PDSCH. For example, assuming the first codepoint is codepoint1, the second codepoint is codepoint2, and the codepoint1 indicated by the network-side device corresponds to {TCI state 1, TCI state 2}, when scheduling PDSCH, the network-side device uses the DCI to indicate codepoint2 (corresponding to either TCI state 1 or TCI state 2). However, the TCI state corresponding to this codepoint2 is not used for other channels; other channels still use codepoint1.

[0373] Each first TCI state can correspond to its own first identifier information, such as: channel group, CORESET group, or TRP ID, etc. The aforementioned preset first identifier information can be the first channel group / first CORESET group / first TRP ID, etc., or it can also be the second channel group / second CORESET group / second TRP ID, etc., other preset order or position of first identifier information. In this case, the first TCI state corresponding to the preset order or position of first identifier information can be determined as the target TCI state.

[0374] If the DCI indicating the first TCI state or the PDCCH containing the DCI scheduling the target downlink channel is in repetition transmission mode, the target downlink channel can use the same TCI state as the PDCCH (furthermore, it can use the same beam information determination scheme as the PDCCH), or use at least one default TCI state among the TCI states used for PDCCH repetition transmission.

[0375] Through the above implementation method, the unifiedTCI framework indicated by the network-side device for mTRP scenarios can be applied to target downlink channels such as PDSCH or DL ​​RS resources.

[0376] It is worth noting that in implementation, there are cases where the network-side device only indicates one first TCI state, for example, the network-side device indicates one joint TCI state or one separate DL TCI state as the first TCI state. In this case, the beam information determination schemes for various downlink channels are as follows:

[0377] As an optional implementation, when the number of the first TCI states is equal to 1, if the type of the target downlink channel is PDSCH or DL ​​RS resource, the terminal determines the target TCI state of the target downlink channel based on the target information, including at least one of the following:

[0378] When the target downlink channel corresponds to the same first identification information as the first TCI state, the terminal determines that the target TCI state includes the first TCI state;

[0379] When the first identification information corresponds to a different target downlink channel and the first TCI state, the terminal determines that the target TCI state includes the original TCI state of the target downlink channel or determines that the target downlink channel stops transmitting;

[0380] The terminal determines the target TCI state, including the TCI state of scheduling or triggering the PDCCH of the target downlink channel;

[0381] When the target downlink channel has at least two existing TCI states, the terminal determines the target TCI state as: one of the at least two existing TCI states of the target downlink channel, or the first TCI state; or, the terminal determines to update the seventh preset TCI state among the at least two existing TCI states of the target downlink channel to the first TCI state; wherein the seventh preset TCI state corresponds to the same first identification information as the first TCI state; or the seventh preset TCI state is one of the at least two existing TCI states of the target downlink channel located at a preset position; or the seventh preset TCI state is associated with the first TCI state.

[0382] Option 1: In the case where the target downlink channel corresponds to the same first identifier information as the first TCI state, the terminal determines that the target TCI state includes the first TCI state. This can be understood as follows: the first TCI state indicated by the network-side device is only used for its associated channel group / CORESET group / TRP ID / CORESETPoolIndex, and the channels and RS resources corresponding to the channel group / CORESET group / TRP ID / CORESETPoolIndex not associated with the first TCI state are not updated with TCI state or are stopped from transmission.

[0383] In implementation, whether to perform a TCI status update can be determined based on whether the channel group / CORESET group / TRP ID / CORESETPoolIndex corresponding to the PDSCH or DL ​​RS resources is associated with a first TCI status indicated by the network-side device. Specifically, if an association with a first TCI status is established, the original TCI status of the target downlink channel can be updated to a first TCI status indicated by the network-side device, i.e., a TCI status update is performed. Conversely, if no association with a first TCI status is established, the original TCI status of the target downlink channel can be used to determine beam information or other downlink channel information, i.e., no TCI status update is performed.

[0384] Option 2: In the case where the target downlink channel corresponds to a different first identifier information than the first TCI state, the terminal determines that the target TCI state includes the original TCI state of the target downlink channel or determines that the target downlink channel stops transmission. That is, PDSCH or DL ​​RS resources corresponding to channel groups / CORESET groups / TRP IDs not associated with the first TCI state are not updated with TCI state, or transmission is stopped.

[0385] Option 3: The terminal determines the target TCI state by using the TCI state of the PDCCH that schedules or triggers the target downlink channel. This can be done by using the TCI state of the PDCCH that schedules the PDSCH, or by using the TCI state of the PDCCH that schedules the DL RS for non-periodic DL RS resources. For periodic DL RS resources or DL ​​RS resources carrying periodic information, other methods can be used to determine the target TCI state.

[0386] Option 4: In the case where the target downlink channel has at least two existing TCI states, the terminal determines the target TCI state as either one of the existing at least two TCI states of the target downlink channel, or the first TCI state. Alternatively, the terminal determines to update the seventh preset TCI state from the existing at least two TCI states of the target downlink channel to the first TCI state. This can be achieved by: if the PDSCH or DL ​​RS resource originally used two TCI states for transmission, then directly applying the first TCI state indicated by the network-side device, i.e., updating to single-beam transmission mode; or updating the seventh preset TCI state from the existing two TCI states of the PDSCH or DL ​​RS resource to the first TCI state indicated by the network-side device. Alternatively, no TCI state update may be performed. The seventh preset TCI state can correspond to the same channel group / CORESET group / TRP ID / CORESETPoolIndex as one of the first TCI states indicated by the network-side device, or the seventh preset TCI state can be one of the two TCI states originally used by the PDSCH or DL ​​RS resources (such as the first one), or the seventh preset TCI state can be associated with one of the first TCI states indicated by the network-side device in advance.

[0387] This implementation solves the problem of how to determine the beam information or transmission information of PDSCH and DL RS resources based on the first TCI state indicated by the network-side device, which is available for sharing among various channels in the mTRP scenario.

[0388] As an optional implementation, the transmission mode of the target downlink channel is a repetitive transmission mode, or the type of the target downlink channel is a PDSCH or DL ​​RS resource and the target DCI scheduling the target downlink channel simultaneously schedules at least two PDSCH or at least two DL RS resources.

[0389] After the terminal obtains the common beam information indicated by the network-side device, the method further includes:

[0390] The terminal sends a first feedback message to the network-side device at a first moment, the first feedback message being used to indicate that the terminal has correctly received the common beam information;

[0391] The terminal determines whether the target downlink channel is repeatedly transmitted in a time slot after the second time or whether the PDSCH or DL ​​RS resources scheduled by the target DCI in a time slot after the second time are transmitted using the common beam information, wherein the time difference between the second time and the first time is a first preset duration, and the second time is later than the first time.

[0392] The second moment can be the time when the public beam information takes effect. In other words, the first preset duration can be a pre-set duration or a duration configured by the network-side device. Specifically, it can include the duration between the moment the first feedback information is sent from the terminal to the network-side device and the moment when the network-side device and the terminal begin applying the public beam information. Thus, after the terminal sends the first feedback information, an interval of the first preset duration is sufficient to assume that the public beam information is effective. Correspondingly, after receiving the first feedback information from the terminal, the network-side device can confirm that the terminal has correctly received the public beam information based on the first feedback information, and after receiving the first feedback information, an interval of the first preset duration is sufficient to assume that the public beam information is effective.

[0393] In implementation, if the channel or reference signal corresponding to the common beam information is a repeatedly transmitted channel or signal, or is one of multiple PDSCHs or DL ​​RS resources scheduled by a DCI, such as multi-slot PDSCHs or multiple PDSCHs scheduled by a single DCI, the repeated transmission of the channel or signal transmitted in the time slot after a first preset duration from the transmission time of the first feedback information, or some of the PDSCHs in at least two PDSCHs scheduled by a DCI, can use the common beam information. That is, all the above-mentioned channels are transmitted across multiple slots, and a slot in these multiple slots happens to be the effective time of the common beam information. Therefore, in the slots where the above-mentioned channels are transmitted after this effective time, the above-mentioned channels use the newly indicated common beam information from the network for transmission. For example: Suppose that the transmission mode of the target downlink channel is the repeated transmission mode, and its four repeated transmissions correspond to time slots 1, 2, 3 and 4 respectively, and the effective time of the common beam information is time slot 3. Then the target downlink channel can use the common beam information (i.e. the first TCI state) in time slots 3 and 4, while using the original beam information of the target downlink channel (i.e. the original TCI state) in time slots 1 and 2.

[0394] It should be noted that the aforementioned first feedback information may specifically refer to an acknowledgment (ACK) message indicating receipt of the public beam information. If the terminal sends a negative acknowledgment (NACK) message indicating receipt of the public beam information, the terminal and the network-side device can determine that the public beam information is not effective.

[0395] In implementation, if the transmission mode of the target downlink channel is a repetitive transmission mode, the multiple repetitive transmissions of the target downlink channel may span multiple time slots; or, if at least two PDSCHs are scheduled by a DCI, the at least two PDSCHs may be transmitted in different time slots. Thus, the effective time of the common beam information may fall within the multiple time slots spanned by the target downlink channel. In this embodiment, after the common beam information becomes effective, it can be used immediately to transmit part of the repetitive transmissions of the target downlink channel or part of the PDSCHs scheduled by a DCI.

[0396] In this application embodiment, a unified TCI framework scheme applicable to mTRP scenarios is proposed, enabling the R17 unified TCI framework to be applied to mTRP scenarios. Furthermore, a beam determination scheme for repetition, SFN, PDCCH in conventional single-beam transmission mode, and other downlink channels and DL RS resources or resource sets is proposed when the network-side device indicates one or more joint / separate TCI states. This scheme determines the beam information of downlink channels, DL RS resources, or DL ​​RS resource sets in various transmission modes based on the unified TCI state (i.e., the first TCI state) indicated by the network-side device, thereby ensuring consistent understanding of the beams used between the network-side device and the terminal.

[0397] Please see Figure 3 Another downlink TCI state determination method provided in this application embodiment is similar to... Figure 2 The biggest difference in the method embodiments shown is that, as Figure 2 The execution subject of the method embodiment shown is a terminal, while as Figure 3 The execution subject of the method embodiment shown is a network-side device, and the various steps performed by the network-side device are as follows: Figure 2 In the method embodiments shown, the steps executed by the terminal are the same or corresponding, therefore, as Figure 3 The explanations and descriptions of the various methods and embodiments shown can be found in the following references: Figure 2 The corresponding explanations in the method embodiments shown will not be repeated here.

[0398] like Figure 3 As shown, the downlink TCI status determination method applicable to network-side devices may include the following steps:

[0399] Step 301: The network-side device indicates common beam information to the terminal. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DL TCI state, and N is an integer greater than or equal to 1.

[0400] Step 302: The network-side device determines the target TCI state of the target downlink channel based on the target information. The target information includes at least one of the following:

[0401] The number of the first TCI states;

[0402] The order or position of the first TCI states;

[0403] The correspondence between the first TCI state and the first identification information;

[0404] The type of the target downlink channel;

[0405] The transmission mode of the target downlink channel;

[0406] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0407] The number of the first identification information corresponding to the target downlink channel;

[0408] The value of the first identifier information corresponding to the target downlink channel;

[0409] The first identification information includes at least one of the following:

[0410] Control resource set CORESET identification information;

[0411] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0412] The identification information of the CORESET where the interrelated SSs are located;

[0413] The transmission timing information or transmission time information of the interconnected SS;

[0414] CORESET pool identification CORESETPoolIndex;

[0415] Send the TRP identifier ID information of the receiving point;

[0416] Channel group identification information;

[0417] CORESET group identification information;

[0418] Physical uplink control channel (PUCCH) resource group identification information.

[0419] Optionally, when the target information includes the number of the first TCI states, the network-side device determines the target TCI state of the target downlink channel based on the target information, including:

[0420] When the terminal uses single-beam transmission, if the number of the first TCI states is one, then the network-side device determines that the transmission mode of the target downlink channel is single-beam transmission; or,

[0421] When the terminal uses single-beam transmission, if the number of the first TCI states is at least two, the network-side device determines the transmission mode of the target downlink channel as single-beam transmission, repeated transmission mode, or multi-beam simultaneous transmission mode; or,

[0422] When the terminal uses a repetitive transmission mode or a multi-beam simultaneous transmission mode, if the number of the first TCI states is one, the network-side device determines that the transmission mode of the target downlink channel is single-beam transmission, the repetitive transmission mode, or the multi-beam simultaneous transmission mode; or,

[0423] When the terminal adopts a repetitive transmission mode or a multi-beam simultaneous transmission mode, if the number of the first TCI states is at least two, the network-side device determines that the transmission mode of the target downlink channel is the repetitive transmission mode or the multi-beam simultaneous transmission mode.

[0424] Optionally, if the target downlink channel has a periodic time-domain behavior or the carried information has a periodic time-domain behavior, the target TCI state includes at least one of the following:

[0425] Other TCI states in the TCI state pool besides the first TCI state, or the original TCI state of the target downlink channel;

[0426] The first TCI state corresponding to the first identifier information associated with the target downlink channel;

[0427] The first TCI state indicated by the first indication information from the network-side device;

[0428] First preset TCI state;

[0429] The first preset TCI state includes at least one of the following:

[0430] The first TCI states arranged in preset positions among all the first TCI states;

[0431] The first TCI state corresponding to the preset first identifier information.

[0432] Optionally, when the number of the first TCI states is greater than K, where K is the number of TCI states required for the target downlink channel, the network-side device determines the target TCI states of the target downlink channel based on the target information, including:

[0433] The network-side device determines K first TCI states arranged in preset positions as the target TCI states of the target downlink channel; or...

[0434] The network-side device determines K first TCI states from all first TCI states as the target TCI states and sends second indication information to the terminal, wherein the second indication information is used to indicate the K first TCI states.

[0435] Optionally, the second indication information is carried in a first signaling field, which is a signaling field in the Media Access Control (MAC) Controller (CE) signaling or DCI signaling.

[0436] Optionally, the first signaling field is used for DCI format 1_1 or DCI format 1_2.

[0437] Optionally, the first signaling domain becomes active or exists when a preset condition is met, and the preset condition includes at least one of the following:

[0438] The network-side device is configured with the first signaling domain;

[0439] The network-side device indicates at least two first TCI states via DCI signaling;

[0440] Among the TCI code points activated by the network-side device through MAC CE, at least one code point corresponds to at least two TCI states.

[0441] Optionally, if the target downlink channel has M TCI states, and the number of the first TCI states is at least M, then the target TCI state is at least M of the first TCI states, where M is an integer greater than or equal to 2; or,

[0442] If the target downlink channel has M TCI states, and N is less than M, then the target TCI state is the original M TCI states of the target downlink channel; or, the target TCI state is the original (MN) TCI states of the target downlink channel and the N first TCI states; or, the target TCI state is the N first TCI states; or...

[0443] If the target downlink channel has one TCI state, and the number of the first TCI states is at least one, then the target TCI state is at least one first TCI state.

[0444] Optionally, the type of the target downlink channel includes at least one of the following: physical downlink control channel (PDCCH), physical downlink shared channel (PDSCH), DL reference signal (RS) resource and PDCCH on the first CORESET, channel scheduled or triggered by PDCCH on the first CORESET, and channel associated with the first CORESET.

[0445] The first CORESET includes at least one of the following: CORESET#0, CORESET that only associates with the public search space CSS, CORESET that only associates with the terminal-specific search space USS, and CORESET that associates with both USS and CSS.

[0446] Optionally, the PDCCH includes at least one of the following:

[0447] All PDCCHs, PDCCHs on the terminal-specific control resource set CORESET, PDCCHs on the CORESET associated only with USS, PDCCHs on the CORESET associated only with CSS, PDCCHs on the CORESET associated with both USS and CSS, and PDCCHs on all other CORESETs except CORESET#0;

[0448] And / or,

[0449] The PDSCH includes at least one of the following:

[0450] The PDSCH scheduled by the PDCCH, the PDSCH associated with the PDCCH, and the PDSCH dedicated to the terminal.

[0451] Optionally, the transmission mode includes: a preset transmission mode, a repeated transmission mode, a multi-beam simultaneous transmission mode, or a transmission mode that dynamically switches between the preset transmission mode, the repeated transmission mode, and the multi-beam simultaneous transmission mode, wherein the preset transmission mode is a single-beam transmission without repeated transmission.

[0452] The network-side device determines the target TCI state of the target downlink channel based on the target information, including:

[0453] The network-side device determines the target TCI state of the target downlink channel from the first TCI state based on the transmission mode of the target downlink channel;

[0454] The downlink TCI state determination method also includes:

[0455] The network-side device sends a third indication information to the terminal, wherein the third indication information is used to indicate the transmission mode of the target downlink channel.

[0456] Optionally, if the number of the first TCI states is greater than 1, and if the target downlink channel type is PDCCH and the transmission mode is repetitive transmission mode, then the target TCI states include at least one of the following:

[0457] The first TCI state of the first identification information that corresponds to the first SS, wherein the first SS is at least two mutually associated SSs in which the target downlink channel is located;

[0458] All of the first TCI states, wherein each of the first TCI states is applied to the target downlink channel transmitted on the interrelated SS according to the correspondence between the first TCI states and the first identification information;

[0459] or,

[0460] When the number of the first TCI states is equal to 1, if the type of the target downlink channel is PDCCH and the transmission mode is repetitive transmission mode, then the network-side device determines the target TCI state of the target downlink channel based on the target information, including at least one of the following:

[0461] The network-side device determines that the retransmission configuration of the target downlink channel has failed;

[0462] The network-side device determines one of at least two mutually associated SSs containing the target downlink channel to transmit the target downlink channel;

[0463] The network-side device determines one of at least two CORESETs corresponding to at least two mutually associated SSs containing the target downlink channel to transmit the target downlink channel;

[0464] The network-side device determines to perform repeated PDCCH transmission based on the first TCI state;

[0465] The network-side device determines that the target TCI state includes at least two existing TCI states of the target downlink channel.

[0466] The network-side device determines to update the second preset TCI state of the original at least two TCI states of the target downlink channel to the first TCI state; wherein the second preset TCI state corresponds to the same first identification information as the first TCI state; or the second preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the second preset TCI state is associated with the first TCI state.

[0467] Optionally, in multi-DCI mode, the CORESETs of the at least two interconnected SSs are located in different CORESETPoolIndexes; in single-DCI mode, the at least two interconnected SSs correspond to different first identification information.

[0468] Optionally, before the network-side device determines the target TCI state of the target downlink channel based on the target information, the downlink TCI state determination method further includes:

[0469] The network-side device sends first configuration information to the terminal;

[0470] The first configuration information is used to configure the SS in CORESET corresponding to different first identification information to be mutually associated.

[0471] Optionally, if the number of the first TCI states is greater than 1, and if the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, then the target TCI states include at least one of the following:

[0472] At least two first TCI states of the CORESET where the target downlink channel is located;

[0473] At least two first TCI states corresponding to at least two of the first identifier information;

[0474] At least two TCI states of the target downlink channel determined according to the order or position of the first TCI states;

[0475] All of the first TCI states;

[0476] The first TCI state corresponding to the first PDCCH, the first PDCCH includes: a PDCCH that schedules the target downlink channel, or a PDCCH that schedules the target downlink channel and whose transmission mode is multi-beam simultaneous transmission mode, or any PDCCH, or any PDCCH whose transmission mode is multi-beam simultaneous transmission mode.

[0477] or,

[0478] When the number of the first TCI states is equal to 1, if the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, the network-side device determines the target TCI state of the terminal target downlink channel based on the target information, including at least one of the following:

[0479] The network-side device determines that the configuration for simultaneous multi-beam transmission of the target downlink channel has failed.

[0480] The network-side device determines that the target downlink channel is transmitted based on the first TCI state.

[0481] The network-side device determines that the target TCI state includes at least two existing TCI states of the target downlink channel.

[0482] The network-side device determines to update the third preset TCI state of the original at least two TCI states of the target downlink channel to the first TCI state; wherein the third preset TCI state corresponds to the same first identification information as the first TCI state; or the third preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the third preset TCI state is associated with the first TCI state.

[0483] Optionally, if the target TCI state includes at least two first TCI states, the downlink TCI state determination method further includes:

[0484] The network-side device determines the QCL parameters of the target downlink channel based on the target parameters, wherein the target parameters include all QCL parameters of the fourth preset TCI state among the at least two first TCI states, and the average delay parameter and delay spread parameter among the Class A QCL parameters of the other TCI states among the at least two first TCI states besides the fourth preset TCI state.

[0485] Optionally, when the target downlink channel type is PDCCH and the transmission mode is a preset transmission mode, the target TCI state includes a fifth preset TCI state, wherein the fifth preset TCI state includes at least one of the following:

[0486] All of the first TCI states arranged in a preset position;

[0487] The first TCI state corresponding to the preset first identifier information;

[0488] The first TCI state corresponding to the first identification information associated with the target downlink channel;

[0489] The network-side device indicates the first TCI state from all the first TCI states.

[0490] Optionally, if the number of the first TCI states is greater than 1, and the target downlink channel type is PDSCH or DL ​​RS resource, then the target TCI state includes at least one of the following:

[0491] All of the first TCI states;

[0492] The network-side device indicates at least one first TCI state from all the first TCI states;

[0493] Sixth preset TCI state;

[0494] The sixth preset TCI state includes at least one of the following:

[0495] At least one of the first TCI state corresponding to the first code point or the first TCI state corresponding to the first code point, wherein the first code point is the code point indicated by the TCI field in the DCI indicating the first TCI state.

[0496] The first TCI state corresponding to the preset first identifier information;

[0497] The first TCI state is the same as the TCI state of the PDCCH where the DCI of the target downlink channel is located;

[0498] The first TCI state corresponding to the first identifier information associated with the PDCCH where the DCI of the target downlink channel is located;

[0499] The first TCI state corresponding to the first identifier information associated with the target downlink channel;

[0500] The first TCI state is determined based on the second code point indicated by the network-side device and is dedicated to the target downlink channel. The second code point is the code point indicated by the TCI field in the DCI that schedules the target downlink channel, and the first TCI state corresponding to the second code point is a subset or the entire set of the first TCI states corresponding to the first code point.

[0501] The same first TCI state as the PDCCH used for repeated transmission or multi-beam simultaneous transmission, or at least one of the first TCI states used for repeated transmission or multi-beam simultaneous transmission of PDCCH, wherein the PDCCH used for repeated transmission or multi-beam simultaneous transmission is the PDCCH in which the DCI indicating the first TCI state is located, or the PDCCH that schedules the target downlink channel.

[0502] or,

[0503] When the number of the first TCI states is equal to 1, if the type of the target downlink channel is PDSCH or DL ​​RS resource, the network-side device determines the target TCI state of the target downlink channel based on the target information, including at least one of the following:

[0504] When the target downlink channel corresponds to the same first identification information as the first TCI state, the network-side device determines that the target TCI state includes the first TCI state;

[0505] When the first identification information corresponding to the target downlink channel is different from the first TCI state, the network-side device determines that the target TCI state includes the original TCI state of the target downlink channel or determines that the target downlink channel stops transmitting;

[0506] The network-side device determines the target TCI state, including the TCI state of the PDCCH that schedules or triggers the target downlink channel;

[0507] When the target downlink channel has at least two existing TCI states, the network-side device determines the target TCI state as either one of the existing at least two TCI states of the target downlink channel, or the first TCI state; or, the terminal determines to update the seventh preset TCI state among the existing at least two TCI states of the target downlink channel to the first TCI state; wherein the seventh preset TCI state corresponds to the same first identification information as the first TCI state; or the seventh preset TCI state is one of the existing at least two TCI states of the target downlink channel located at a preset position; or the seventh preset TCI state is associated with the first TCI state.

[0508] Optionally, the transmission mode of the target downlink channel is a repetitive transmission mode, or the type of the target downlink channel is a PDSCH or DL ​​RS resource and the target DCI scheduling the target downlink channel simultaneously schedules at least two PDSCH or at least two DL RS resources.

[0509] After the terminal obtains the common beam information indicated by the network-side device, the method further includes:

[0510] The network-side device receives first feedback information from the terminal, the first feedback information being used to indicate that the terminal has correctly received the common beam information;

[0511] The network-side device configures the public beam information to take effect based on the first feedback information;

[0512] The network-side device determines whether the target downlink channel is repeatedly transmitted in a time slot after the second time or whether the PDSCH or DL ​​RS resources scheduled by the target DCI in a time slot after the second time are transmitted using the common beam information, wherein the second time is the effective time of the common beam information.

[0513] In this application embodiment, a unified TCI framework scheme applicable to mTRP scenarios is proposed, enabling the R17 unified TCI framework to be applied to mTRP scenarios. Furthermore, it proposes a beam determination scheme for repetition, SFN, PDCCH in conventional single-beam transmission mode, and other downlink channels and DL RS resources or resource sets when the network-side device indicates one or more joint / separate TCI states. This scheme determines the beam information of downlink channels, DL RS resources, or DL ​​RS resource sets in various transmission modes based on the unified TCI state (i.e., the first TCI state) indicated by the network-side device, thereby ensuring consistent understanding of the beams used between the network-side device and the terminal.

[0514] The downlink TCI status determination method provided in this application can be executed by a downlink TCI status determination device. This application uses the example of a downlink TCI status determination device executing the downlink TCI status determination method to illustrate the downlink TCI status determination device provided in this application.

[0515] In one implementation, if the downlink TCI state determination device is applied to the terminal, then as follows: Figure 4 As shown, the downlink TCI status determination device 400 may include the following modules:

[0516] The first acquisition module 401 is used to acquire common beam information indicated by the network-side device. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DLTCI state, and N is an integer greater than or equal to 1.

[0517] The first determining module 402 is used to determine the target TCI state of the target downlink channel based on target information. The target information includes at least one of the following:

[0518] The number of the first TCI states;

[0519] The order or position of the first TCI states;

[0520] The correspondence between the first TCI state and the first identification information;

[0521] The type of the target downlink channel;

[0522] The transmission mode of the target downlink channel;

[0523] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0524] The number of the first identification information corresponding to the target downlink channel;

[0525] The value of the first identifier information corresponding to the target downlink channel;

[0526] The first identification information includes at least one of the following:

[0527] Control resource set CORESET identification information;

[0528] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0529] The identification information of the CORESET where the interrelated SSs are located;

[0530] The transmission timing information or transmission time information of the interconnected SS;

[0531] CORESET pool identification CORESETPoolIndex;

[0532] Send the TRP identifier ID information of the receiving point;

[0533] Channel group identification information;

[0534] CORESET group identification information;

[0535] Physical uplink control channel (PUCCH) resource group identification information.

[0536] Optionally, when the target information includes the number of the first TCI states, the first determining module 402 is specifically used for:

[0537] When the terminal uses single-beam transmission, if the number of the first TCI states is one, then the transmission mode of the target downlink channel is determined to be single-beam transmission; or,

[0538] When the terminal uses single-beam transmission, if the number of the first TCI states is at least two, then the transmission mode of the target downlink channel is determined to be single-beam transmission, repeated transmission mode, or multi-beam simultaneous transmission mode; or,

[0539] When the terminal uses a repetitive transmission mode or a multi-beam simultaneous transmission mode, if the number of the first TCI states is one, then the transmission mode of the target downlink channel is determined to be either single-beam transmission, the repetitive transmission mode, or the multi-beam simultaneous transmission mode; or,

[0540] If the terminal uses a repeat transmission mode or a multi-beam simultaneous transmission mode, and the number of the first TCI states is at least two, then the transmission mode of the target downlink channel is determined to be the repeat transmission mode or the multi-beam simultaneous transmission mode.

[0541] Optionally, if the target downlink channel has periodic time-domain behavior or the information it carries has periodic time-domain behavior, the target TCI state includes at least one of the following:

[0542] Other TCI states in the TCI state pool besides the first TCI state, or the original TCI state of the target downlink channel;

[0543] The first TCI state corresponding to the first identifier information associated with the target downlink channel;

[0544] The first TCI state indicated by the first indication information from the network-side device;

[0545] First preset TCI state;

[0546] The first preset TCI state includes at least one of the following:

[0547] The first TCI states arranged in preset positions among all the first TCI states;

[0548] The first TCI state corresponding to the preset first identifier information.

[0549] Optionally, if the number of the first TCI states is greater than K, where K is the number of TCI states required for the target downlink channel, the first determining module 402 is specifically used to perform:

[0550] The K first TCI states arranged in preset positions are determined as the target TCI states of the target downlink channel; or...

[0551] The target TCI state of the target downlink channel is determined based on the indication from the second indication information from the network-side device, wherein the second indication information is used to indicate K first TCI states.

[0552] Optionally, the second indication information is carried in a first signaling field, which is a signaling field in the Media Access Control (MAC) Controller (CE) signaling or DCI signaling.

[0553] Optionally, the first signaling field is used for DCI format 1_1 or DCI format 1_2.

[0554] Optionally, the first signaling domain becomes active or exists when preset conditions are met, and the preset conditions include at least one of the following:

[0555] The network-side device is configured with the first signaling domain;

[0556] The network-side device indicates at least two first TCI states via DCI signaling;

[0557] Among the TCI code points activated by the network-side device through the Media Access Control (MAC) control unit (CE), at least one code point corresponds to at least two TCI states.

[0558] Optionally, the first TCI state includes N joint TCI states or N independent downlink DL TCI states, where N is an integer greater than 1.

[0559] Optionally, if the target downlink channel has M TCI states, and the number of the first TCI states is at least M, then the target TCI state is at least M of the first TCI states, where M is an integer greater than or equal to 2; or,

[0560] If the target downlink channel has M TCI states, and N is less than M, then the target TCI state is the original M TCI states of the target downlink channel; or, the target TCI state is the original (MN) TCI states of the target downlink channel and the N first TCI states; or, the target TCI state is the N first TCI states; or...

[0561] If the target downlink channel has one TCI state, and the number of the first TCI states is at least one, then the target TCI state is at least one first TCI state.

[0562] Optionally, the type of the target downlink channel includes at least one of the following: Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), DL Reference Signal (RS) resource, PDCCH on the first CORESET, a channel scheduled or triggered by the PDCCH on the first CORESET, and a channel associated with the first CORESET.

[0563] The first CORESET includes at least one of the following: CORESET#0, CORESET that only associates with the public search space CSS, CORESET that only associates with the terminal-specific search space USS, and CORESET that associates with both USS and CSS.

[0564] Optionally, the PDCCH includes at least one of the following:

[0565] All PDCCHs, PDCCHs on the terminal-specific control resource set CORESET, PDCCHs on the CORESET associated only with USS, PDCCHs on the CORESET associated only with CSS, PDCCHs on the CORESET associated with both USS and CSS, and PDCCHs on all other CORESETs except CORESET#0;

[0566] And / or,

[0567] The PDSCH includes at least one of the following:

[0568] The PDSCH scheduled by the PDCCH, the PDSCH associated with the PDCCH, and the PDSCH dedicated to the terminal.

[0569] Optionally, the downlink TCI status determination device 400 also includes:

[0570] The first receiving module is used to receive third indication information from the network-side device;

[0571] The third determining module is used to determine the transmission mode of the target downlink channel according to the third indication information. The transmission mode includes: a preset transmission mode, a repeated transmission mode, a multi-beam simultaneous transmission mode, or a transmission mode that dynamically switches between the preset transmission mode, the repeated transmission mode, and the multi-beam simultaneous transmission mode. The preset transmission mode is a single-beam transmission without repeated transmission.

[0572] Optionally, if the number of the first TCI states is greater than 1, and if the target downlink channel type is PDCCH and the transmission mode is repetitive transmission mode, then the target TCI state includes at least one of the following:

[0573] The first TCI state of the first identification information that corresponds to the first SS, wherein the first SS is at least two mutually associated SSs in which the target downlink channel is located;

[0574] All of the first TCI states, wherein each of the first TCI states is applied to the target downlink channel transmitted on the interrelated SS according to the correspondence between the first TCI states and the first identification information;

[0575] or,

[0576] When the number of the first TCI states is equal to 1, if the type of the target downlink channel is PDCCH and the transmission mode is repetitive transmission mode, then the first determining module 402 is specifically used to perform at least one of the following:

[0577] The retransmission configuration of the target downlink channel is determined to be invalid;

[0578] The target downlink channel is located in one of at least two mutually associated SSs to transmit the target downlink channel;

[0579] The target downlink channel is transmitted by determining one of at least two CORESETs corresponding to at least two mutually associated SSs.

[0580] Determine whether to perform PDCCH retransmission based on the first TCI state;

[0581] The target TCI state is determined by including at least two existing TCI states of the target downlink channel;

[0582] The second preset TCI state in the original at least two TCI states of the target downlink channel is updated to the first TCI state; wherein the second preset TCI state corresponds to the same first identification information as the first TCI state; or the second preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the second preset TCI state is associated with the first TCI state.

[0583] Optionally, in the multi-DCI mode, the CORESETs of the at least two interconnected SSs are located in different CORESETPoolIndexes;

[0584] In single DCI mode, the at least two interconnected SS correspond to different first identification information.

[0585] Optionally, the downlink TCI status determination device 400 also includes:

[0586] The second receiving module is used to receive first configuration information from the network-side device;

[0587] The first configuration information is used to configure the SS in CORESET corresponding to different first identification information to be mutually associated.

[0588] Optionally, if the number of the first TCI states is greater than 1, and if the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, then the target TCI states include at least one of the following:

[0589] At least two first TCI states of the CORESET where the target downlink channel is located;

[0590] At least two first TCI states corresponding to at least two of the first identifier information;

[0591] At least two TCI states of the target downlink channel determined according to the order or position of the first TCI states;

[0592] All of the first TCI states;

[0593] The first TCI state corresponding to the first PDCCH, the first PDCCH includes: a PDCCH that schedules the target downlink channel, or a PDCCH that schedules the target downlink channel and whose transmission mode is multi-beam simultaneous transmission mode, or any PDCCH, or any PDCCH whose transmission mode is multi-beam simultaneous transmission mode.

[0594] or,

[0595] When the number of the first TCI states is equal to 1, if the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, then the first determining module 402 is specifically used to perform at least one of the following:

[0596] The configuration of simultaneous multi-beam transmission of the target downlink channel is determined to be invalid;

[0597] The target downlink channel is determined based on the first TCI state transmission;

[0598] The target TCI state is determined by including at least two existing TCI states of the target downlink channel;

[0599] The third preset TCI state among the original at least two TCI states of the target downlink channel is determined to be updated to the first TCI state; wherein the third preset TCI state corresponds to the same first identification information as the first TCI state; or the third preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the third preset TCI state is associated with the first TCI state.

[0600] Optionally, if the target TCI state includes at least two first TCI states, the downlink TCI state determination device 400 further includes:

[0601] The fourth determining module is used to determine the QCL parameters of the target downlink channel based on the target parameters, wherein the target parameters include all QCL parameters of the fourth preset TCI state among the at least two first TCI states, and the average delay parameter and delay spread parameter among the Class A QCL parameters of the other TCI states among the at least two first TCI states besides the fourth preset TCI state.

[0602] Optionally, when the target downlink channel type is PDCCH and the transmission mode is a preset transmission mode, the target TCI state includes a fifth preset TCI state, wherein the fifth preset TCI state includes at least one of the following:

[0603] All of the first TCI states arranged in a preset position;

[0604] The first TCI state corresponding to the preset first identifier information;

[0605] The first TCI state corresponding to the first identification information associated with the target downlink channel;

[0606] The network-side device indicates the first TCI state from all the first TCI states.

[0607] Optionally, if the number of the first TCI states is greater than 1, and if the target downlink channel type is PDSCH or DL ​​RS resource, then the target TCI state includes at least one of the following:

[0608] All of the first TCI states;

[0609] The network-side device indicates at least one first TCI state from all the first TCI states; or,

[0610] Sixth preset TCI state;

[0611] The sixth preset TCI state includes at least one of the following:

[0612] At least one of the first TCI state corresponding to the first code point or the first TCI state corresponding to the first code point, wherein the first code point is the code point indicated by the TCI field in the DCI indicating the first TCI state.

[0613] The first TCI state corresponding to the preset first identifier information;

[0614] The first TCI state is the same as the TCI state of the PDCCH where the DCI of the target downlink channel is located;

[0615] The first TCI state corresponding to the first identifier information associated with the PDCCH where the DCI of the target downlink channel is located;

[0616] The first TCI state corresponding to the first identifier information associated with the target downlink channel;

[0617] The first TCI state is determined based on the second code point indicated by the network-side device and is dedicated to the target downlink channel. The second code point is the code point indicated by the TCI field in the DCI that schedules the target downlink channel, and the first TCI state corresponding to the second code point is a subset or the entire set of the first TCI states corresponding to the first code point.

[0618] The same first TCI state as the PDCCH used for repeated transmission or multi-beam simultaneous transmission, or at least one of the first TCI states used for repeated transmission or multi-beam simultaneous transmission of PDCCH, wherein the PDCCH used for repeated transmission or multi-beam simultaneous transmission is the PDCCH in which the DCI indicating the first TCI state is located, or the PDCCH that schedules the target downlink channel.

[0619] or,

[0620] When the number of the first TCI states is equal to 1, if the type of the target downlink channel is PDSCH or DL ​​RS resource, then the first determining module 402 is specifically used to perform at least one of the following:

[0621] If the target downlink channel corresponds to the same first identification information as the first TCI state, it is determined that the target TCI state includes the first TCI state;

[0622] If the first identification information corresponds to a different target downlink channel and the first TCI state, it is determined that the target TCI state includes the original TCI state of the target downlink channel or that the target downlink channel stops transmitting;

[0623] Determining the target TCI state includes the TCI state of the PDCCH that schedules or triggers the target downlink channel;

[0624] When the target downlink channel has at least two existing TCI states, the target TCI state is determined to be: one of the at least two existing TCI states of the target downlink channel, or the first TCI state; or, the terminal determines to update the seventh preset TCI state among the at least two existing TCI states of the target downlink channel to the first TCI state; wherein, the seventh preset TCI state corresponds to the same first identification information as the first TCI state; or the seventh preset TCI state is one of the at least two existing TCI states of the target downlink channel located at a preset position; or the seventh preset TCI state is associated with the first TCI state.

[0625] Optionally, the transmission mode of the target downlink channel is a repetitive transmission mode, or the type of the target downlink channel is a PDSCH or DL ​​RS resource and the target DCI scheduling the target downlink channel simultaneously schedules at least two PDSCH or at least two DL RS resources.

[0626] The downlink TCI status determination device 400 also includes:

[0627] The third sending module is used to send first feedback information to the network-side device at a first moment, and the first feedback information is used to indicate that the terminal has correctly received the public beam information.

[0628] The sixth determining module is used to determine whether the target downlink channel is retransmitted in a time slot after the second time or whether the PDSCH or DL ​​RS resources scheduled by the target DCI in a time slot after the second time are transmitted using the common beam information, wherein the time difference between the second time and the first time is a first preset duration, and the second time is later than the first time.

[0629] The downlink TCI status determination device 400 in this embodiment 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 a chip. The electronic device can be a terminal or other devices besides a terminal. For example, the terminal can include, but is not limited to, the type of terminal 11 listed above; other devices can be servers, network attached storage (NAS), etc., and this embodiment does not specifically limit the type.

[0630] The downlink TCI status determination device 400 provided in this application embodiment can perform the following: Figure 2 In the method embodiment shown, the terminal performs each step and achieves the same beneficial effect. To avoid repetition, these steps will not be described again here.

[0631] In another implementation, if the downlink TCI state determination device is applied to network-side equipment, then as follows: Figure 5 As shown, the downlink TCI status determination device 500 may include the following modules:

[0632] The indication module 501 is used to indicate common beam information to the terminal. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DL TCI state, and N is an integer greater than or equal to 1.

[0633] The second determining module 502 is used to determine the target TCI state of the target downlink channel based on the target information. The target information includes at least one of the following:

[0634] The number of the first TCI states;

[0635] The order or position of the first TCI states;

[0636] The correspondence between the first TCI state and the first identification information;

[0637] The type of the target downlink channel;

[0638] The transmission mode of the target downlink channel;

[0639] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0640] The number of the first identification information corresponding to the target downlink channel;

[0641] The value of the first identifier information corresponding to the target downlink channel;

[0642] The first identification information includes at least one of the following:

[0643] Control resource set CORESET identification information;

[0644] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0645] The identification information of the CORESET where the interrelated SSs are located;

[0646] The transmission timing information or transmission time information of the interconnected SS;

[0647] CORESET pool identification CORESETPoolIndex;

[0648] Send the TRP identifier ID information of the receiving point;

[0649] Channel group identification information;

[0650] CORESET group identification information;

[0651] Physical uplink control channel (PUCCH) resource group identification information.

[0652] Optionally, when the target information includes the number of the first TCI states, the second determining module 502 is specifically used for:

[0653] When the terminal uses single-beam transmission, if the number of the first TCI states is one, then the transmission mode of the target downlink channel is determined to be single-beam transmission; or,

[0654] When the terminal uses single-beam transmission, if the number of the first TCI states is at least two, then the transmission mode of the target downlink channel is determined to be single-beam transmission, repeated transmission mode, or multi-beam simultaneous transmission mode; or,

[0655] When the terminal uses a repetitive transmission mode or a multi-beam simultaneous transmission mode, if the number of the first TCI states is one, then the transmission mode of the target downlink channel is determined to be either single-beam transmission, the repetitive transmission mode, or the multi-beam simultaneous transmission mode; or,

[0656] If the terminal uses a repeat transmission mode or a multi-beam simultaneous transmission mode, and the number of the first TCI states is at least two, then the transmission mode of the target downlink channel is determined to be the repeat transmission mode or the multi-beam simultaneous transmission mode.

[0657] Optionally, if the target downlink channel has periodic time-domain behavior or the information it carries has periodic time-domain behavior, the target TCI state includes at least one of the following:

[0658] Other TCI states in the TCI state pool besides the first TCI state, or the original TCI state of the target downlink channel;

[0659] The first TCI state corresponding to the first identifier information associated with the target downlink channel;

[0660] The first TCI state indicated by the first indication information from the network-side device;

[0661] First preset TCI state;

[0662] The first preset TCI state includes at least one of the following:

[0663] The first TCI states arranged in preset positions among all the first TCI states;

[0664] The first TCI state corresponding to the preset first identifier information.

[0665] Optionally, if the number of the first TCI states is greater than K, where K is the number of TCI states required for the target downlink channel, the second determining module 502 includes:

[0666] The first determining unit is configured to determine K first TCI states arranged at preset positions as the target TCI states of the target downlink channel; or...

[0667] The second determining unit and the sending unit are configured to determine K first TCI states as the target TCI states from all the first TCI states; the sending unit is configured to send second indication information to the terminal, wherein the second indication information is used to indicate the K first TCI states.

[0668] Optionally, the second indication information is carried in a first signaling field, which is a signaling field in the Media Access Control (MAC) Controller (CE) signaling or DCI signaling.

[0669] Optionally, the first signaling field is used for DCI format 1_1 or DCI format 1_2.

[0670] Optionally, the first signaling domain becomes active or exists when preset conditions are met, and the preset conditions include at least one of the following:

[0671] The network-side device is configured with the first signaling domain;

[0672] The network-side device indicates at least two first TCI states via DCI signaling;

[0673] Among the TCI code points activated by the network-side device through MAC CE, at least one code point corresponds to at least two TCI states.

[0674] Optionally, if the target downlink channel has M TCI states, and the number of the first TCI states is at least M, then the target TCI state is at least M of the first TCI states, where M is an integer greater than or equal to 2; or,

[0675] If the target downlink channel has M TCI states, and N is less than M, then the target TCI state is the original M TCI states of the target downlink channel; or, the target TCI state is the original (MN) TCI states of the target downlink channel and the N first TCI states; or, the target TCI state is the N first TCI states; or...

[0676] If the target downlink channel has one TCI state, and the number of the first TCI states is at least one, then the target TCI state is at least one first TCI state.

[0677] Optionally, the type of the target downlink channel includes at least one of the following: Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), DL Reference Signal (RS) resource and PDCCH on the first CORESET, a channel scheduled or triggered by PDCCH on the first CORESET, and a channel associated with the first CORESET.

[0678] The first CORESET includes at least one of the following: CORESET#0, CORESET that only associates with the public search space CSS, CORESET that only associates with the terminal-specific search space USS, and CORESET that associates with both USS and CSS.

[0679] Optionally, the PDCCH includes at least one of the following:

[0680] The PDCCH includes at least one of the following:

[0681] All PDCCHs, PDCCHs on the terminal-specific control resource set CORESET, PDCCHs on the CORESET associated only with USS, PDCCHs on the CORESET associated only with CSS, PDCCHs on the CORESET associated with both USS and CSS, and PDCCHs on all other CORESETs except CORESET#0;

[0682] And / or,

[0683] The PDSCH includes at least one of the following:

[0684] The PDSCH scheduled by the PDCCH, the PDSCH associated with the PDCCH, and the PDSCH dedicated to the terminal.

[0685] Optionally, the transmission mode includes: a preset transmission mode, a repeated transmission mode, a multi-beam simultaneous transmission mode, or a transmission mode that dynamically switches between the preset transmission mode, the repeated transmission mode, and the multi-beam simultaneous transmission mode, wherein the preset transmission mode is a single-beam transmission without repeated transmission.

[0686] The second determining module 502 is specifically used for:

[0687] The target TCI state of the target downlink channel is determined from the first TCI state based on the transmission mode of the target downlink channel;

[0688] The downlink TCI status determination device 500 further includes:

[0689] The first sending module is used to send third indication information to the terminal, wherein the third indication information is used to indicate the transmission mode of the target downlink channel.

[0690] Optionally, if the number of the first TCI states is greater than 1, and if the target downlink channel type is PDCCH and the transmission mode is repetitive transmission mode, then the target TCI state includes at least one of the following:

[0691] The first TCI state of the first identification information that corresponds to the first SS, wherein the first SS is at least two mutually associated SSs in which the target downlink channel is located;

[0692] All of the first TCI states, wherein each of the first TCI states is applied to the target downlink channel transmitted on the interrelated SS according to the correspondence between the first TCI states and the first identification information;

[0693] or,

[0694] When the number of the first TCI states is equal to 1, if the type of the target downlink channel is PDCCH and the transmission mode is repetitive transmission mode, then the second determining module 502 is specifically used to perform at least one of the following:

[0695] The retransmission configuration of the target downlink channel is determined to be invalid;

[0696] The target downlink channel is located in one of at least two mutually associated SSs to transmit the target downlink channel;

[0697] The target downlink channel is transmitted by determining one of at least two CORESETs corresponding to at least two mutually associated SSs.

[0698] Determine whether to perform PDCCH retransmission based on the first TCI state;

[0699] The target TCI state is determined by including at least two existing TCI states of the target downlink channel;

[0700] The second preset TCI state in the original at least two TCI states of the target downlink channel is updated to the first TCI state; wherein the second preset TCI state corresponds to the same first identification information as the first TCI state; or the second preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the second preset TCI state is associated with the first TCI state.

[0701] Optionally, in the multi-DCI mode, the CORESETs of the at least two interconnected SSs are located in different CORESETPoolIndexes;

[0702] In single DCI mode, the at least two interconnected SS correspond to different first identification information.

[0703] Optionally, the downlink TCI status determination device 500 also includes:

[0704] The second sending module is used to send the first configuration information to the terminal;

[0705] The first configuration information is used to configure the SS in CORESET corresponding to different first identification information to be mutually associated.

[0706] Optionally, if the number of the first TCI states is greater than 1, and if the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, then the target TCI states include at least one of the following:

[0707] At least two first TCI states of the CORESET where the target downlink channel is located;

[0708] At least two first TCI states corresponding to at least two of the first identifier information;

[0709] At least two TCI states of the target downlink channel determined according to the order or position of the first TCI states;

[0710] All of the first TCI states;

[0711] The first TCI state corresponding to the first PDCCH, the first PDCCH includes: a PDCCH that schedules the target downlink channel, or a PDCCH that schedules the target downlink channel and whose transmission mode is multi-beam simultaneous transmission mode, or any PDCCH, or any PDCCH whose transmission mode is multi-beam simultaneous transmission mode.

[0712] or,

[0713] When the number of the first TCI states is equal to 1, if the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, then the second determining module 502 is specifically used to perform at least one of the following:

[0714] The configuration of simultaneous multi-beam transmission of the target downlink channel is determined to be invalid;

[0715] The target downlink channel is determined based on the first TCI state transmission;

[0716] The target TCI state is determined by including at least two existing TCI states of the target downlink channel;

[0717] The third preset TCI state among the original at least two TCI states of the target downlink channel is determined to be updated to the first TCI state; wherein the third preset TCI state corresponds to the same first identification information as the first TCI state; or the third preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the third preset TCI state is associated with the first TCI state.

[0718] Optionally, if the target TCI state includes at least two first TCI states, the downlink TCI state determination device 500 further includes:

[0719] The fifth determining module is used to determine the QCL parameters of the target downlink channel based on the target parameters, wherein the target parameters include all QCL parameters of the fourth preset TCI state among the at least two first TCI states, and the average delay parameter and delay spread parameter among the Class A QCL parameters of the other TCI states among the at least two first TCI states besides the fourth preset TCI state.

[0720] Optionally, when the target downlink channel type is PDCCH and the transmission mode is a preset transmission mode, the target TCI state includes a fifth preset TCI state, wherein the fifth preset TCI state includes at least one of the following:

[0721] All of the first TCI states arranged in a preset position;

[0722] The first TCI state corresponding to the preset first identifier information;

[0723] The first TCI state corresponding to the first identification information associated with the target downlink channel;

[0724] The network-side device indicates the first TCI state from all the first TCI states.

[0725] Optionally, if the number of the first TCI states is greater than 1, and if the target downlink channel type is PDSCH or DL ​​RS resource, then the target TCI state includes at least one of the following:

[0726] All of the first TCI states;

[0727] The network-side device indicates at least one first TCI state from all the first TCI states;

[0728] Sixth preset TCI state;

[0729] The sixth preset TCI state includes at least one of the following:

[0730] At least one of the first TCI state corresponding to the first code point or the first TCI state corresponding to the first code point, wherein the first code point is the code point indicated by the TCI field in the DCI indicating the first TCI state.

[0731] The first TCI state corresponding to the preset first identifier information;

[0732] The first TCI state is the same as the TCI state of the PDCCH where the DCI of the target downlink channel is located;

[0733] The first TCI state corresponding to the first identifier information associated with the PDCCH where the DCI of the target downlink channel is located;

[0734] The first TCI state corresponding to the first identifier information associated with the target downlink channel;

[0735] The first TCI state is determined based on the second code point indicated by the network-side device and is dedicated to the target downlink channel. The second code point is the code point indicated by the TCI field in the DCI that schedules the target downlink channel, and the first TCI state corresponding to the second code point is a subset or the entire set of the first TCI states corresponding to the first code point.

[0736] The same first TCI state as the PDCCH used for repeated transmission or multi-beam simultaneous transmission, or at least one of the first TCI states used for repeated transmission or multi-beam simultaneous transmission of PDCCH, wherein the PDCCH used for repeated transmission or multi-beam simultaneous transmission is the PDCCH in which the DCI indicating the first TCI state is located, or the PDCCH that schedules the target downlink channel.

[0737] or,

[0738] If the number of the first TCI states is equal to 1, and the type of the target downlink channel is PDSCH or DL ​​RS resource, then the second determining module 502 is specifically used to perform at least one of the following:

[0739] If the target downlink channel corresponds to the same first identification information as the first TCI state, it is determined that the target TCI state includes the first TCI state;

[0740] If the first identification information corresponds to a different target downlink channel and the first TCI state, it is determined that the target TCI state includes the original TCI state of the target downlink channel or that the target downlink channel stops transmitting;

[0741] Determining the target TCI state includes the TCI state of the PDCCH that schedules or triggers the target downlink channel;

[0742] When the target downlink channel has at least two existing TCI states, the target TCI state is determined to be: one of the at least two existing TCI states of the target downlink channel, or the first TCI state; or, the terminal determines to update the seventh preset TCI state among the at least two existing TCI states of the target downlink channel to the first TCI state; wherein, the seventh preset TCI state corresponds to the same first identification information as the first TCI state; or the seventh preset TCI state is one of the at least two existing TCI states of the target downlink channel located at a preset position; or the seventh preset TCI state is associated with the first TCI state.

[0743] Optionally, the transmission mode of the target downlink channel is a repetitive transmission mode, or the type of the target downlink channel is a PDSCH or DL ​​RS resource and the target DCI scheduling the target downlink channel simultaneously schedules at least two PDSCH or at least two DL RS resources.

[0744] Downlink TCI status determination device 500 also includes:

[0745] The third receiving module is used to receive first feedback information from the terminal, the first feedback information being used to indicate that the terminal has correctly received the common beam information;

[0746] The configuration module is used to configure the public beam information to take effect based on the first feedback information;

[0747] The seventh determining module is used to determine whether the target downlink channel will be retransmitted in a time slot after the second time or whether the PDSCH or DL ​​RS resources scheduled by the target DCI in a time slot after the second time will be transmitted using the common beam information, wherein the second time is the effective time of the common beam information.

[0748] The downlink TCI status determination device 500 in this embodiment 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 a chip. This electronic device can be a network-side device or other devices besides network-side devices. For example, network-side devices can include, but are not limited to, the types of network-side devices 12 listed above. Other devices can be servers, network-attached storage (NAS), etc., and this embodiment does not impose specific limitations.

[0749] The downlink TCI status determination device 500 provided in this application embodiment can perform the following: Figure 3 In the method embodiment shown, the terminal performs each step and achieves the same beneficial effect. To avoid repetition, these steps will not be described again here.

[0750] Optional, such as Figure 6 As shown, this application embodiment also provides a communication device 600, including a processor 601 and a memory 602. The memory 602 stores programs or instructions that can run on the processor 601. For example, when the communication device 600 is a terminal, the program or instructions executed by the processor 601 implement... Figure 2 or Figure 3 The steps of the downlink TCI state determination method embodiment shown can achieve the same technical effect. When the communication device 600 is a terminal, the program or instruction executed by the processor 601 implements the following... Figure 2 The various steps of the method embodiment shown; when the communication device 600 is a network-side device, the program or instruction executed by the processor 601 implements as follows: Figure 3 The steps of the method embodiment shown are the same and can achieve the same technical effect. To avoid repetition, they will not be described again here.

[0751] This application embodiment also provides a terminal, including a processor and a communication interface. The communication interface is used to acquire common beam information indicated by a network-side device. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI states are either joint TCI states or independent downlink DL TCI states, and N is an integer greater than or equal to 1. The processor is used to determine the target TCI state of a target downlink channel based on target information, where the target information includes at least one of the following:

[0752] The number of the first TCI states;

[0753] The order or position of the first TCI states;

[0754] The correspondence between the first TCI state and the first identification information;

[0755] The type of the target downlink channel;

[0756] The transmission mode of the target downlink channel;

[0757] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0758] The number of the first identification information corresponding to the target downlink channel;

[0759] The value of the first identifier information corresponding to the target downlink channel;

[0760] The first identification information includes at least one of the following:

[0761] Control resource set CORESET identification information;

[0762] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0763] The identification information of the CORESET where the interrelated SSs are located;

[0764] The transmission timing information or transmission time information of the interconnected SS;

[0765] CORESET pool identification CORESETPoolIndex;

[0766] Send the TRP identifier ID information of the receiving point;

[0767] Channel group identification information;

[0768] CORESET group identification information;

[0769] Physical uplink control channel (PUCCH) resource group identification information.

[0770] This terminal embodiment corresponds to the aforementioned terminal-side method embodiment. All implementation processes and methods of the aforementioned method embodiments can be applied to this terminal embodiment and achieve the same technical effect. Specifically, Figure 7 A schematic diagram of the hardware structure of a terminal to implement an embodiment of this application.

[0771] The terminal 700 includes, but is not limited to, at least some of the following components: radio frequency unit 701, network module 702, audio output unit 703, input unit 704, sensor 705, display unit 706, user input unit 707, interface unit 708, memory 709, and processor 710.

[0772] Those skilled in the art will understand that the terminal 700 may also include a power supply (such as a battery) for supplying power to various components. The power supply may be logically connected to the processor 710 through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 7 The terminal structure shown does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0773] It should be understood that, in this embodiment, the input unit 704 may include a graphics processing unit (GPU) 7041 and a microphone 7042. The GPU 7041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 706 may include a display panel 7061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 707 includes at least one of a touch panel 7071 and other input devices 7072. The touch panel 7071 is also called a touch screen. The touch panel 7071 may include a touch detection device and a touch controller. Other input devices 7072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0774] In this embodiment, after receiving downlink data from the network-side device, the radio frequency unit 701 can transmit it to the processor 710 for processing; in addition, the radio frequency unit 701 can send uplink data to the network-side device. Typically, the radio frequency unit 701 includes, but is not limited to, an antenna, amplifier, transceiver, coupler, low-noise amplifier, duplexer, etc.

[0775] The memory 709 can be used to store software programs or instructions, as well as various data. The memory 709 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 709 may include volatile memory or non-volatile memory, or both. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 709 in the embodiments of this application includes, but is not limited to, these and any other suitable types of memory.

[0776] Processor 710 may include one or more processing units; optionally, processor 710 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 710.

[0777] The radio frequency unit 701 is used to acquire common beam information indicated by the network-side device. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DL TCI state, and N is an integer greater than or equal to 1.

[0778] Processor 710 is configured to determine the target TCI state of the target downlink channel based on target information. The target information includes at least one of the following:

[0779] The number of the first TCI states;

[0780] The order or position of the first TCI states;

[0781] The correspondence between the first TCI state and the first identification information;

[0782] The type of the target downlink channel;

[0783] The transmission mode of the target downlink channel;

[0784] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0785] The number of the first identification information corresponding to the target downlink channel;

[0786] The value of the first identifier information corresponding to the target downlink channel;

[0787] The first identification information includes at least one of the following:

[0788] Control resource set CORESET identification information;

[0789] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0790] The identification information of the CORESET where the interrelated SSs are located;

[0791] The transmission timing information or transmission time information of the interconnected SS;

[0792] CORESET pool identification CORESETPoolIndex;

[0793] Send the TRP identifier ID information of the receiving point;

[0794] Channel group identification information;

[0795] CORESET group identification information;

[0796] Physical uplink control channel (PUCCH) resource group identification information.

[0797] Optionally, when the target information includes the number of the first TCI states, the step of determining the target TCI state of the target downlink channel based on the target information, performed by the processor 710, includes:

[0798] When the terminal uses single-beam transmission, if the number of the first TCI states is one, then the transmission mode of the target downlink channel is determined to be single-beam transmission; or,

[0799] When the terminal uses single-beam transmission, if the number of the first TCI states is at least two, then the transmission mode of the target downlink channel is determined to be single-beam transmission, repeated transmission mode, or multi-beam simultaneous transmission mode; or,

[0800] When the terminal uses a repetitive transmission mode or a multi-beam simultaneous transmission mode, if the number of the first TCI states is one, then the transmission mode of the target downlink channel is determined to be either single-beam transmission, the repetitive transmission mode, or the multi-beam simultaneous transmission mode; or,

[0801] If the terminal uses a repeat transmission mode or a multi-beam simultaneous transmission mode, and the number of the first TCI states is at least two, then the transmission mode of the target downlink channel is determined to be the repeat transmission mode or the multi-beam simultaneous transmission mode.

[0802] Optionally, if the target downlink channel has a periodic time-domain behavior or the carried information has a periodic time-domain behavior, the target TCI state includes at least one of the following:

[0803] Other TCI states in the TCI state pool besides the first TCI state, or the original TCI state of the target downlink channel;

[0804] The first TCI state corresponding to the first identifier information associated with the target downlink channel;

[0805] The first TCI state indicated by the first indication information from the network-side device;

[0806] First preset TCI state;

[0807] The first preset TCI state includes at least one of the following:

[0808] The first TCI states arranged in preset positions among all the first TCI states;

[0809] The first TCI state corresponding to the preset first identifier information.

[0810] Optionally, when the number of the first TCI states is greater than K, where K is the number of TCI states required by the target downlink channel, the step of determining the target TCI state of the target downlink channel based on the target information executed by the processor 710 includes:

[0811] The K first TCI states arranged in preset positions are determined as the target TCI states of the target downlink channel; or...

[0812] The target TCI state of the target downlink channel is determined based on the indication from the second indication information from the network-side device, wherein the second indication information is used to indicate K first TCI states.

[0813] Optionally, the second indication information is carried in a first signaling field, which is a signaling field in the Media Access Control (MAC) Controller (CE) signaling or DCI signaling.

[0814] Optionally, the first signaling field is used for DCI format 1_1 or DCI format 1_2.

[0815] Optionally, the first signaling domain becomes active or exists when a preset condition is met, and the preset condition includes at least one of the following:

[0816] The network-side device is configured with the first signaling domain;

[0817] The network-side device indicates at least two first TCI states via DCI signaling;

[0818] Among the TCI code points activated by the network-side device through the Media Access Control (MAC) control unit (CE), at least one code point corresponds to at least two TCI states.

[0819] Optionally, the first TCI state includes N joint TCI states or N independent downlink DL TCI states, where N is an integer greater than 1.

[0820] Optionally, if the target downlink channel has M TCI states, and the number of the first TCI states is at least M, then the target TCI state is at least M of the first TCI states, where M is an integer greater than or equal to 2; or,

[0821] If the target downlink channel has M TCI states, and N is less than M, then the target TCI state is the original M TCI states of the target downlink channel; or, the target TCI state is the original (MN) TCI states of the target downlink channel and the N first TCI states; or, the target TCI state is the N first TCI states; or...

[0822] If the target downlink channel has one TCI state, and the number of the first TCI states is at least one, then the target TCI state is at least one first TCI state.

[0823] Optionally, the type of the target downlink channel includes at least one of the following: Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), DL Reference Signal (RS) resource, PDCCH on the first CORESET, a channel scheduled or triggered by the PDCCH on the first CORESET, and a channel associated with the first CORESET.

[0824] The first CORESET includes at least one of the following: CORESET#0, CORESET that only associates with the public search space CSS, CORESET that only associates with the terminal-specific search space USS, and CORESET that associates with both USS and CSS.

[0825] Optionally, the PDCCH includes at least one of the following:

[0826] All PDCCHs, PDCCHs on the terminal-specific control resource set CORESET, PDCCHs on the CORESET associated only with USS, PDCCHs on the CORESET associated only with CSS, PDCCHs on the CORESET associated with both USS and CSS, and PDCCHs on all other CORESETs except CORESET#0;

[0827] And / or,

[0828] The PDSCH includes at least one of the following:

[0829] The PDSCH scheduled by the PDCCH, the PDSCH associated with the PDCCH, and the PDSCH dedicated to the terminal.

[0830] Optionally, before the processor 710 performs the task of determining the target TCI state of the target downlink channel based on the target information:

[0831] The radio frequency unit 701 is also used to receive third indication information from the network side device;

[0832] The processor 710 is further configured to determine the transmission mode of the target downlink channel according to the third indication information, the transmission mode including: a preset transmission mode, a repeated transmission mode, a multi-beam simultaneous transmission mode, or a transmission mode that dynamically switches between the preset transmission mode, the repeated transmission mode, and the multi-beam simultaneous transmission mode, wherein the preset transmission mode is a non-repeated single-beam transmission.

[0833] Optionally, if the number of the first TCI states is greater than 1, and if the target downlink channel type is PDCCH and the transmission mode is repetitive transmission mode, then the target TCI states include at least one of the following:

[0834] The first TCI state of the first identification information that corresponds to the first SS, wherein the first SS is at least two mutually associated SSs in which the target downlink channel is located;

[0835] All of the first TCI states, wherein each of the first TCI states is applied to the target downlink channel transmitted on the interrelated SS according to the correspondence between the first TCI states and the first identification information;

[0836] or,

[0837] When the number of the first TCI states is equal to 1, if the type of the target downlink channel is PDCCH and the transmission mode is repetitive transmission mode, then the process 710 performing the step of determining the target TCI state of the target downlink channel based on the target information includes at least one of the following:

[0838] The retransmission configuration of the target downlink channel is determined to be invalid;

[0839] The target downlink channel is located in one of at least two mutually associated SSs to transmit the target downlink channel;

[0840] The target downlink channel is transmitted by determining one of at least two CORESETs corresponding to at least two mutually associated SSs.

[0841] Determine whether to perform PDCCH retransmission based on the first TCI state;

[0842] The target TCI state is determined by including at least two existing TCI states of the target downlink channel;

[0843] The second preset TCI state in the original at least two TCI states of the target downlink channel is updated to the first TCI state; wherein the second preset TCI state corresponds to the same first identification information as the first TCI state; or the second preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the second preset TCI state is associated with the first TCI state.

[0844] Optionally, in the multi-DCI mode, the CORESETs of the at least two interconnected SSs are located in different CORESETPoolIndexes;

[0845] In single DCI mode, the at least two interconnected SS correspond to different first identification information.

[0846] Optionally, before the processor 710 performs the step of determining the target TCI state of the target downlink channel based on the target information;

[0847] The radio frequency unit 701 is also used to receive first configuration information from the network-side device;

[0848] The first configuration information is used to configure the SS in CORESET corresponding to different first identification information to be mutually associated.

[0849] Optionally, if the number of the first TCI states is greater than 1, and if the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, then the target TCI states include at least one of the following:

[0850] At least two first TCI states of the CORESET where the target downlink channel is located;

[0851] At least two first TCI states corresponding to at least two of the first identifier information;

[0852] At least two TCI states of the target downlink channel determined according to the order or position of the first TCI states;

[0853] All of the first TCI states;

[0854] The first TCI state corresponding to the first PDCCH, the first PDCCH includes: a PDCCH that schedules the target downlink channel, or a PDCCH that schedules the target downlink channel and whose transmission mode is multi-beam simultaneous transmission mode, or any PDCCH, or any PDCCH whose transmission mode is multi-beam simultaneous transmission mode.

[0855] or,

[0856] When the number of the first TCI states is equal to 1, if the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, then the process of determining the target TCI state of the target downlink channel based on the target information executed by the processor 710 includes at least one of the following:

[0857] The configuration of simultaneous multi-beam transmission of the target downlink channel is determined to be invalid;

[0858] The target downlink channel is determined based on the first TCI state transmission;

[0859] The target TCI state is determined by including at least two existing TCI states of the target downlink channel;

[0860] The third preset TCI state among the original at least two TCI states of the target downlink channel is determined to be updated to the first TCI state; wherein the third preset TCI state corresponds to the same first identification information as the first TCI state; or the third preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the third preset TCI state is associated with the first TCI state.

[0861] Optionally, this applies when the target TCI state includes at least two first TCI states;

[0862] The processor 710 is further configured to determine the QCL parameters of the target downlink channel based on the target parameters, wherein the target parameters include all QCL parameters of the fourth preset TCI state among the at least two first TCI states, and the average delay parameter and delay spread parameter among the Class A QCL parameters of the other TCI states among the at least two first TCI states besides the fourth preset TCI state.

[0863] Optionally, when the target downlink channel type is PDCCH and the transmission mode is a preset transmission mode, the target TCI state includes a fifth preset TCI state, wherein the fifth preset TCI state includes at least one of the following:

[0864] All of the first TCI states arranged in a preset position;

[0865] The first TCI state corresponding to the preset first identifier information;

[0866] The first TCI state corresponding to the first identification information associated with the target downlink channel;

[0867] The network-side device indicates the first TCI state from all the first TCI states.

[0868] Optionally, if the number of the first TCI states is greater than 1, and the target downlink channel type is PDSCH or DL ​​RS resource, then the target TCI state includes at least one of the following:

[0869] All of the first TCI states;

[0870] The network-side device indicates at least one first TCI state from all the first TCI states;

[0871] Sixth preset TCI state;

[0872] The sixth preset TCI state includes at least one of the following:

[0873] At least one of the first TCI state corresponding to the first code point or the first TCI state corresponding to the first code point, wherein the first code point is the code point indicated by the TCI field in the DCI indicating the first TCI state.

[0874] The first TCI state corresponding to the preset first identifier information;

[0875] The first TCI state is the same as the TCI state of the PDCCH where the DCI of the target downlink channel is located;

[0876] The first TCI state corresponding to the first identifier information associated with the PDCCH where the DCI of the target downlink channel is located;

[0877] The first TCI state corresponding to the first identifier information associated with the target downlink channel;

[0878] The first TCI state is determined based on the second code point indicated by the network-side device and is dedicated to the target downlink channel. The second code point is the code point indicated by the TCI field in the DCI that schedules the target downlink channel, and the first TCI state corresponding to the second code point is a subset or the entire set of the first TCI states corresponding to the first code point.

[0879] The same first TCI state as the PDCCH used for repeated transmission or multi-beam simultaneous transmission, or at least one of the first TCI states used for repeated transmission or multi-beam simultaneous transmission of PDCCH, wherein the PDCCH used for repeated transmission or multi-beam simultaneous transmission is the PDCCH in which the DCI indicating the first TCI state is located, or the PDCCH that schedules the target downlink channel.

[0880] or,

[0881] When the number of the first TCI states is equal to 1, if the type of the target downlink channel is PDSCH or DL ​​RS resource, the process 710 performing the step of determining the target TCI state of the target downlink channel based on the target information includes at least one of the following:

[0882] If the target downlink channel corresponds to the same first identification information as the first TCI state, it is determined that the target TCI state includes the first TCI state;

[0883] If the first identification information corresponds to a different target downlink channel and the first TCI state, it is determined that the target TCI state includes the original TCI state of the target downlink channel or that the target downlink channel stops transmitting;

[0884] Determining the target TCI state includes the TCI state of the PDCCH that schedules or triggers the target downlink channel;

[0885] When the target downlink channel has at least two existing TCI states, the target TCI state is determined to be: one of the at least two existing TCI states of the target downlink channel, or the first TCI state; or, the terminal determines to update the seventh preset TCI state among the at least two existing TCI states of the target downlink channel to the first TCI state; wherein, the seventh preset TCI state corresponds to the same first identification information as the first TCI state; or the seventh preset TCI state is one of the at least two existing TCI states of the target downlink channel located at a preset position; or the seventh preset TCI state is associated with the first TCI state.

[0886] Optionally, the transmission mode of the target downlink channel is a repetitive transmission mode, or the type of the target downlink channel is a PDSCH or DL ​​RS resource and the target DCI scheduling the target downlink channel simultaneously schedules at least two PDSCH or at least two DL RS resources.

[0887] After performing the acquisition of the common beam information indicated by the network-side device, the radio frequency unit 701 is also used to send first feedback information to the network-side device at a first moment. The first feedback information is used to indicate that the terminal has correctly received the common beam information.

[0888] The processor 710 is further configured to determine whether the target downlink channel is retransmitted in a time slot after the second time or whether the PDSCH or DL ​​RS resources scheduled by the target DCI in a time slot after the second time are transmitted using the common beam information, wherein the time difference between the second time and the first time is a first preset duration, and the second time is later than the first time.

[0889] The terminal 700 provided in this embodiment can achieve the following: Figure 4 The various processes executed by the downlink TCI status determination device 400 shown are all capable of achieving the same beneficial effects, and will not be described again here to avoid repetition.

[0890] This application embodiment also provides a network-side device, including a processor and a communication interface. The communication interface is used to indicate common beam information to a terminal. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI states are either joint TCI states or independent downlink DL TCI states, and N is an integer greater than or equal to 1. The processor is used to determine the target TCI state of a target downlink channel based on target information, where the target information includes at least one of the following:

[0891] The number of the first TCI states;

[0892] The order or position of the first TCI states;

[0893] The correspondence between the first TCI state and the first identification information;

[0894] The type of the target downlink channel;

[0895] The transmission mode of the target downlink channel;

[0896] The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel;

[0897] The number of the first identification information corresponding to the target downlink channel;

[0898] The value of the first identifier information corresponding to the target downlink channel;

[0899] The first identification information includes at least one of the following:

[0900] Control resource set CORESET identification information;

[0901] Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH;

[0902] The identification information of the CORESET where the interrelated SSs are located;

[0903] The transmission timing information or transmission time information of the interconnected SS;

[0904] CORESET pool identification CORESETPoolIndex;

[0905] Send the TRP identifier ID information of the receiving point;

[0906] Channel group identification information;

[0907] CORESET group identification information;

[0908] Physical uplink control channel (PUCCH) resource group identification information.

[0909] This network-side device embodiment corresponds to the above-described network-side device method embodiment. All implementation processes and methods of the above-described method embodiment can be applied to this network-side device embodiment and can achieve the same technical effect.

[0910] Specifically, embodiments of this application also provide a network-side device. For example... Figure 8 As shown, the network-side device 800 includes: an antenna 801, a radio frequency (RF) device 802, a baseband device 803, a processor 804, and a memory 805. The antenna 801 is connected to the RF device 802. In the uplink direction, the RF device 802 receives information through the antenna 801 and transmits the received information to the baseband device 803 for processing. In the downlink direction, the baseband device 803 processes the information to be transmitted and sends it to the RF device 802. The RF device 802 processes the received information and transmits it through the antenna 801.

[0911] The method executed by the network-side device in the above embodiments can be implemented in the baseband device 803, which includes a baseband processor.

[0912] The baseband device 803 may, for example, include at least one baseband board on which multiple chips are disposed, such as... Figure 8 As shown, one of the chips is, for example, a baseband processor, which is connected to the memory 805 via a bus interface to call the program in the memory 805 and execute the network device operation shown in the above method embodiment.

[0913] The network-side device may also include a network interface 806, such as a common public radio interface (CPRI).

[0914] Specifically, the network-side device 800 of this embodiment further includes: instructions or programs stored in a memory 805 and executable on a processor 804, wherein the processor 804 calls the instructions or programs in the memory 805 to execute... Figure 5 The methods executed by each module shown achieve the same technical effect, and to avoid repetition, they will not be described in detail here.

[0915] This application embodiment also provides a readable storage medium storing a program or instructions that, when executed by a processor, implement... Figure 2 or Figure 3 The various processes of the downlink TCI state determination method embodiment shown are all able to achieve the same technical effect, and will not be described again here to avoid repetition.

[0916] The processor is the processor in the terminal described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0917] This application embodiment also provides a chip, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being used to run programs or instructions to implement, as described above. Figure 2 or Figure 3 The various processes of the downlink TCI state determination method embodiment shown are all able to achieve the same technical effect, and will not be described again here to avoid repetition.

[0918] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0919] This application embodiment also provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the following: Figure 2 or Figure 3 The various processes of the downlink TCI state determination method embodiment shown are all able to achieve the same technical effect, and will not be described again here to avoid repetition.

[0920] This application also provides a wireless communication system, including: a terminal and a network-side device, wherein the terminal can be used to perform, for example... Figure 2 The steps of the downlink TCI state determination method shown are described, and the network-side device can be used to perform, as follows: Figure 3 The steps of the downlink TCI state determination method are shown.

[0921] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0922] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0923] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A method for determining the downlink TCI state, characterized in that, include: The terminal obtains the common beam information of the terminal indicated by the network-side device. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DL TCI state, and N is an integer greater than or equal to 1. The terminal determines the target TCI state of the target downlink channel based on the target information, wherein the target information includes at least one of the following: The number of the first TCI states; The order or position of the first TCI states; The correspondence between the first TCI state and the first identification information; The type of the target downlink channel; The transmission mode of the target downlink channel; The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel; The number of the first identification information corresponding to the target downlink channel; The value of the first identifier information corresponding to the target downlink channel; The first identification information includes at least one of the following: Control resource set CORESET identification information; Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH; The identification information of the CORESET where the interrelated SSs are located; The transmission timing information or transmission time information of the interconnected SS; CORESET pool identification CORESETPoolIndex; Send the TRP identifier ID information of the receiving point; Channel group identification information; CORESET group identification information; Physical Uplink Control Channel (PUCCH) resource group identification information; The terminal determines the target TCI state of the target downlink channel based on the target information, including at least one of the following: If the number N of the first TCI states is greater than the number K of the TCI states required by the target downlink channel, the terminal determines the K first TCI states arranged in a preset position as the target TCI states of the target downlink channel; or, the terminal determines the target TCI states of the target downlink channel according to the indication of the second indication information from the network-side device, wherein the second indication information is used to indicate the TCI states, and the TCI states indicated by the second indication information include K first TCI states out of the N first TCI states; When the target downlink channel has M TCI states and the number N of the first TCI states is at least M, the terminal determines that the target TCI state is at least M of the first TCI states, where M is an integer greater than or equal to 2. If the target downlink channel has M TCI states and the number N of the first TCI states is less than M, the terminal determines that the target TCI state is the original M TCI states of the target downlink channel, or the target TCI state is the original (MN) TCI states of the target downlink channel and the N first TCI states; or the target TCI state is the N first TCI states. When the number of the first TCI states is equal to 1, the type of the target downlink channel is PDSCH or DL ​​RS resource, and the target downlink channel corresponds to the same first identification information as the first TCI state, the terminal determines that the target TCI state includes the first TCI state. When the number of the first TCI states is equal to 1, the type of the target downlink channel is PDSCH or DL ​​RS resource, and the target downlink channel corresponds to different first identification information than the first TCI state, the terminal determines that the target TCI state includes the original TCI state of the target downlink channel or determines that the target downlink channel stops transmitting.

2. The method according to claim 1, characterized in that, When the target information includes the number of the first TCI states, the terminal determines the target TCI state of the target downlink channel based on the target information, further including: When the terminal uses single-beam transmission, if the number of the first TCI states is one, then the terminal determines that the transmission mode of the target downlink channel is single-beam transmission; or, When the terminal uses single-beam transmission, if the number of the first TCI states is at least two, then the terminal determines the transmission mode of the target downlink channel as single-beam transmission, repeated transmission mode, or multi-beam simultaneous transmission mode; or, When the terminal uses a repetitive transmission mode or a multi-beam simultaneous transmission mode, if the number of the first TCI states is one, then the terminal determines that the transmission mode of the target downlink channel is single-beam transmission, the repetitive transmission mode, or the multi-beam simultaneous transmission mode; or, When the terminal adopts a repetitive transmission mode or a multi-beam simultaneous transmission mode, if the number of the first TCI states is at least two, the terminal determines that the transmission mode of the target downlink channel is the repetitive transmission mode or the multi-beam simultaneous transmission mode.

3. The method according to claim 1, characterized in that, When the target downlink channel has periodic time-domain behavior or the information it carries has periodic time-domain behavior, the target TCI state includes at least one of the following: Other TCI states in the TCI state pool besides the first TCI state, or the original TCI state of the target downlink channel; The first TCI state corresponding to the first identifier information associated with the target downlink channel; The first TCI state indicated by the first indication information from the network-side device; First preset TCI state; The first preset TCI state includes at least one of the following: The first TCI states arranged in preset positions among all the first TCI states; The first TCI state corresponding to the preset first identifier information.

4. The method according to claim 1, characterized in that, The second indication information is carried in the first signaling field, which is the signaling field in the Media Access Control (MAC) Control Unit (CE) signaling or DCI signaling.

5. The method according to claim 4, characterized in that, The first signaling field is used for DCI format 1_1 or DCI format 1_2.

6. The method according to claim 4, characterized in that, The first signaling domain becomes active or exists when preset conditions are met, and the preset conditions include at least one of the following: The network-side device is configured with the first signaling domain; The network-side device indicates at least two first TCI states via DCI signaling; Among the TCI code points activated by the network-side device through the Media Access Control (MAC) control unit (CE), at least one code point corresponds to at least two TCI states.

7. The method according to any one of claims 1 to 6, characterized in that: If the target downlink channel has one TCI state, and the number of the first TCI states is at least one, then the target TCI state is at least one first TCI state.

8. The method according to any one of claims 1 to 6, characterized in that, The type of the target downlink channel includes at least one of the following: Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), DL Reference Signal (RS) resource, PDCCH on the first CORESET, channel scheduled or triggered by PDCCH on the first CORESET, and channel associated with the first CORESET. The first CORESET includes at least one of the following: CORESET#0, CORESET that only associates with the public search space CSS, CORESET that only associates with the terminal-specific search space USS, and CORESET that associates with both USS and CSS.

9. The method according to claim 8, characterized in that: The PDCCH includes at least one of the following: All PDCCHs, PDCCHs on the terminal-specific control resource set CORESET, PDCCHs on the CORESET associated only with USS, PDCCHs on the CORESET associated only with CSS, PDCCHs on the CORESET associated with both USS and CSS, and PDCCHs on all other CORESETs except CORESET#0; And / or, The PDSCH includes at least one of the following: The PDSCH scheduled by the PDCCH, the PDSCH associated with the PDCCH, and the PDSCH dedicated to the terminal.

10. The method according to any one of claims 1 to 6, characterized in that, Before the terminal determines the target TCI state of the target downlink channel based on the target information, the method further includes: The terminal receives third indication information from the network-side device and determines the transmission mode of the target downlink channel based on the third indication information. The transmission mode includes: a preset transmission mode, a repeated transmission mode, a multi-beam simultaneous transmission mode, or a transmission mode that dynamically switches between the preset transmission mode, the repeated transmission mode, and the multi-beam simultaneous transmission mode. The preset transmission mode is a single-beam transmission without repeated transmission.

11. The method according to claim 1, characterized in that, If the number of the first TCI states is greater than 1, and the target downlink channel type is PDCCH and the transmission mode is repetitive transmission mode, then the target TCI states include at least one of the following: The first TCI state of the first identification information that corresponds to the first SS, wherein the first SS is at least two mutually associated SSs in which the target downlink channel is located; All of the first TCI states, wherein each of the first TCI states is applied to the target downlink channel transmitted on the interrelated SS according to the correspondence between the first TCI states and the first identification information; or, When the number of the first TCI states is equal to 1, if the type of the target downlink channel is PDCCH and the transmission mode is repetitive transmission mode, then the terminal determines the target TCI state of the target downlink channel based on the target information, and further includes at least one of the following: The terminal determines that the retransmission configuration of the target downlink channel has failed; The terminal determines one of at least two mutually associated SSs containing the target downlink channel to transmit the target downlink channel; The terminal determines one of at least two CORESETs corresponding to at least two mutually associated SSs containing the target downlink channel to transmit the target downlink channel; The terminal determines to perform repeated PDCCH transmission based on the first TCI state; The terminal determines that the target TCI state includes at least two existing TCI states of the target downlink channel; The terminal determines to update the second preset TCI state of the original at least two TCI states of the target downlink channel to the first TCI state; wherein the second preset TCI state corresponds to the same first identification information as the first TCI state; or the second preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the second preset TCI state is associated with the first TCI state.

12. The method according to claim 11, characterized in that, In the multi-DCI mode, the CORESETs containing the at least two interconnected SSs are located in different CORESETPoolIndexes; In single DCI mode, the at least two interconnected SS correspond to different first identification information.

13. The method according to claim 12, characterized in that, Before the terminal determines the target TCI state of the target downlink channel based on the target information, the method further includes: The terminal receives first configuration information from the network-side device; The first configuration information is used to configure the SS in CORESET corresponding to different first identification information to be mutually associated.

14. The method according to claim 1, characterized in that, If the number of the first TCI states is greater than 1, and the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, then the target TCI states include at least one of the following: At least two first TCI states of the CORESET where the target downlink channel is located; At least two first TCI states corresponding to at least two of the first identifier information; At least two TCI states of the target downlink channel determined according to the order or position of the first TCI states; All of the first TCI states; The first TCI state corresponding to the first PDCCH, the first PDCCH includes: a PDCCH that schedules the target downlink channel, or a PDCCH that schedules the target downlink channel and whose transmission mode is multi-beam simultaneous transmission mode, or any PDCCH, or any PDCCH whose transmission mode is multi-beam simultaneous transmission mode. or, When the number of the first TCI states is equal to 1, if the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, then the terminal determines the target TCI state of the target downlink channel based on the target information, and further includes at least one of the following: The terminal determines that the configuration for simultaneous multi-beam transmission of the target downlink channel has failed. The terminal determines that the target downlink channel is transmitted based on the first TCI state. The terminal determines that the target TCI state includes at least two existing TCI states of the target downlink channel; The terminal determines to update the third preset TCI state of the original at least two TCI states of the target downlink channel to the first TCI state; wherein the third preset TCI state corresponds to the same first identification information as the first TCI state; or the third preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the third preset TCI state is associated with the first TCI state.

15. The method according to claim 14, characterized in that, When the target TCI state includes at least two first TCI states, the method further includes: The terminal determines the QCL parameters of the target downlink channel based on the target parameters, wherein the target parameters include all QCL parameters of the fourth preset TCI state among the at least two first TCI states, and the average delay parameter and delay spread parameter among the Class A QCL parameters of the other TCI states among the at least two first TCI states besides the fourth preset TCI state.

16. The method according to claim 1, characterized in that, When the target downlink channel is of type PDCCH and the transmission mode is a preset transmission mode, the target TCI state includes a fifth preset TCI state, wherein the fifth preset TCI state includes at least one of the following: All of the first TCI states arranged in a preset position; The first TCI state corresponding to the preset first identifier information; The first TCI state corresponding to the first identification information associated with the target downlink channel; The network-side device indicates the first TCI state from all the first TCI states.

17. The method according to claim 1, characterized in that, If the number of the first TCI states is greater than 1, and the target downlink channel type is PDSCH or DL ​​RS resource, then the target TCI state includes at least one of the following: All of the first TCI states; The network-side device indicates at least one first TCI state from all the first TCI states; Sixth preset TCI state; The sixth preset TCI state includes at least one of the following: At least one of the first TCI state corresponding to the first code point or the first TCI state corresponding to the first code point, wherein the first code point is the code point indicated by the TCI field in the DCI indicating the first TCI state. The first TCI state corresponding to the preset first identifier information; The first TCI state is the same as the TCI state of the PDCCH where the DCI of the target downlink channel is located; The first TCI state corresponding to the first identifier information associated with the PDCCH where the DCI of the target downlink channel is located; The first TCI state corresponding to the first identifier information associated with the target downlink channel; The first TCI state is determined based on the second code point indicated by the network-side device and is dedicated to the target downlink channel. The second code point is the code point indicated by the TCI field in the DCI that schedules the target downlink channel, and the first TCI state corresponding to the second code point is a subset or the entire set of the first TCI states corresponding to the first code point. The same first TCI state as the PDCCH used for repeated transmission or multi-beam simultaneous transmission, or at least one of the first TCI states used for repeated transmission or multi-beam simultaneous transmission of PDCCH, wherein the PDCCH used for repeated transmission or multi-beam simultaneous transmission is the PDCCH in which the DCI indicating the first TCI state is located, or the PDCCH that schedules the target downlink channel. The terminal determines the target TCI state, including the TCI state of scheduling or triggering the PDCCH of the target downlink channel; When the target downlink channel has at least two existing TCI states, the terminal determines the target TCI state as: one of the at least two existing TCI states of the target downlink channel, or the first TCI state; or, the terminal determines to update the seventh preset TCI state among the at least two existing TCI states of the target downlink channel to the first TCI state; wherein the seventh preset TCI state corresponds to the same first identification information as the first TCI state; or the seventh preset TCI state is one of the at least two existing TCI states of the target downlink channel located at a preset position; or the seventh preset TCI state is associated with the first TCI state.

18. The method according to claim 1, characterized in that, The transmission mode of the target downlink channel is a repetitive transmission mode, or the type of the target downlink channel is a PDSCH or DL ​​RS resource and the target DCI scheduling the target downlink channel simultaneously schedules at least two PDSCH or at least two DL RS resources. After the terminal obtains the common beam information indicated by the network-side device, the method further includes: The terminal sends a first feedback message to the network-side device at a first moment, the first feedback message being used to indicate that the terminal has correctly received the common beam information; The terminal determines whether the target downlink channel is repeatedly transmitted in a time slot after the second time or whether the PDSCH or DL ​​RS resources scheduled by the target DCI in a time slot after the second time are transmitted using the common beam information, wherein the time difference between the second time and the first time is a first preset duration, and the second time is later than the first time.

19. A downlink TCI state determination device, characterized in that, Applied to a terminal, the device includes: The first acquisition module is used to acquire the common beam information of the terminal indicated by the network-side device. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DL TCI state, and N is an integer greater than or equal to 1. The first determining module is used to determine the target TCI state of the target downlink channel based on target information, wherein the target information includes at least one of the following: The number of the first TCI states; The order or position of the first TCI states; The correspondence between the first TCI state and the first identification information; The type of the target downlink channel; The transmission mode of the target downlink channel; The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel; The number of the first identification information corresponding to the target downlink channel; The value of the first identifier information corresponding to the target downlink channel; The first identification information includes at least one of the following: Control resource set CORESET identification information; Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH; The identification information of the CORESET where the interrelated SSs are located; The transmission timing information or transmission time information of the interconnected SS; CORESET pool identification CORESETPoolIndex; Send the TRP identifier ID information of the receiving point; Channel group identification information; CORESET group identification information; Physical Uplink Control Channel (PUCCH) resource group identification information; The first determining module is specifically used for: If the number N of the first TCI states is greater than the number K of the TCI states required by the target downlink channel, the K first TCI states arranged in a preset position are determined as the target TCI states of the target downlink channel; or, the terminal determines the target TCI states of the target downlink channel according to the indication of the second indication information from the network-side device, wherein the second indication information is used to indicate the TCI states, and the TCI states indicated by the second indication information include K of the N first TCI states; If the target downlink channel has M TCI states and the number N of the first TCI states is at least M, then the target TCI state is determined to be at least M of the first TCI states, where M is an integer greater than or equal to 2. If the target downlink channel has M TCI states and the number N of the first TCI states is less than M, the target TCI state is determined to be the original M TCI states of the target downlink channel, or the target TCI state is the original (MN) TCI states of the target downlink channel and the N first TCI states; or the target TCI state is the N first TCI states. If the number of the first TCI states is equal to 1, the type of the target downlink channel is PDSCH or DL ​​RS resource, and the target downlink channel corresponds to the same first identification information as the first TCI state, then the target TCI state is determined to include the first TCI state. If the number of the first TCI states is equal to 1, the type of the target downlink channel is PDSCH or DL ​​RS resource, and the target downlink channel corresponds to different first identification information than the first TCI states, then it is determined that the target TCI state includes the original TCI state of the target downlink channel or that the target downlink channel stops transmitting.

20. A method for determining the downlink TCI state, characterized in that, include: The network-side device indicates the common beam information of the terminal to the terminal. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DL TCI state, and N is an integer greater than or equal to 1. The network-side device determines the target TCI state of the target downlink channel based on the target information, wherein the target information includes at least one of the following: The number of the first TCI states; The order or position of the first TCI states; The correspondence between the first TCI state and the first identification information; The type of the target downlink channel; The transmission mode of the target downlink channel; The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel; The number of the first identification information corresponding to the target downlink channel; The value of the first identifier information corresponding to the target downlink channel; The first identification information includes at least one of the following: Control resource set CORESET identification information; Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH; The identification information of the CORESET where the interrelated SSs are located; The transmission timing information or transmission time information of the interconnected SS; CORESET pool identification CORESETPoolIndex; Send the TRP identifier ID information of the receiving point; Channel group identification information; CORESET group identification information; Physical Uplink Control Channel (PUCCH) resource group identification information; The network-side device determines the target TCI state of the target downlink channel based on the target information, including at least one of the following: If the number N of the first TCI states is greater than the number K of the TCI states required by the target downlink channel, the network-side device determines K first TCI states arranged in a preset position as the target TCI states of the target downlink channel; or, the network-side device determines K first TCI states from all the first TCI states as the target TCI states and sends second indication information to the terminal, wherein the second indication information is used to indicate the TCI states, and the TCI states indicated by the second indication information include K first TCI states out of the N first TCI states; When the target downlink channel has M TCI states, and the number N of the first TCI states is at least M, the network-side device determines that the target TCI state is at least M of the first TCI states, where M is an integer greater than or equal to 2. When the target downlink channel has M TCI states, and the number N of the first TCI states is less than M, the network-side device determines that the target TCI state is the original M TCI states of the target downlink channel, or the target TCI state is the original (MN) TCI states of the target downlink channel and the N first TCI states; or the target TCI state is the N first TCI states. If the number of the first TCI states is equal to 1, and the type of the target downlink channel is PDSCH or DL ​​RS resource, and the target downlink channel corresponds to the same first identification information as the first TCI state, the network-side device determines that the target TCI state includes the first TCI state. When the number of the first TCI states is equal to 1, the type of the target downlink channel is PDSCH or DL ​​RS resource, and the target downlink channel corresponds to different first identification information than the first TCI state, the network-side device determines that the target TCI state includes the original TCI state of the target downlink channel or determines that the target downlink channel stops transmitting.

21. The method according to claim 20, characterized in that, When the target information includes the number of the first TCI states, the network-side device determines the target TCI state of the target downlink channel based on the target information, further including: When the terminal uses single-beam transmission, if the number of the first TCI states is one, then the network-side device determines that the transmission mode of the target downlink channel is single-beam transmission; or, When the terminal uses single-beam transmission, if the number of the first TCI states is at least two, the network-side device determines the transmission mode of the target downlink channel as single-beam transmission, repeated transmission mode, or multi-beam simultaneous transmission mode; or, When the terminal uses a repetitive transmission mode or a multi-beam simultaneous transmission mode, if the number of the first TCI states is one, the network-side device determines that the transmission mode of the target downlink channel is single-beam transmission, the repetitive transmission mode, or the multi-beam simultaneous transmission mode; or, When the terminal adopts a repetitive transmission mode or a multi-beam simultaneous transmission mode, if the number of the first TCI states is at least two, the network-side device determines that the transmission mode of the target downlink channel is the repetitive transmission mode or the multi-beam simultaneous transmission mode.

22. The method according to claim 20, characterized in that, When the target downlink channel has periodic time-domain behavior or the information it carries has periodic time-domain behavior, the target TCI state includes at least one of the following: Other TCI states in the TCI state pool besides the first TCI state, or the original TCI state of the target downlink channel; The first TCI state corresponding to the first identifier information associated with the target downlink channel; The first TCI state indicated by the first indication information from the network-side device; First preset TCI state; The first preset TCI state includes at least one of the following: The first TCI states arranged in preset positions among all the first TCI states; The first TCI state corresponding to the preset first identifier information.

23. The method according to claim 20, characterized in that, The second indication information is carried in the first signaling field, which is the signaling field in the Media Access Control (MAC) Control Unit (CE) signaling or DCI signaling.

24. The method according to claim 23, characterized in that, The first signaling field is used for DCI format 1_1 or DCI format 1_2.

25. The method according to claim 24, characterized in that, The first signaling domain becomes active or exists when preset conditions are met, and the preset conditions include at least one of the following: The network-side device is configured with the first signaling domain; The network-side device indicates at least two first TCI states via DCI signaling; Among the TCI code points activated by the network-side device through MAC CE, at least one code point corresponds to at least two TCI states.

26. The method according to any one of claims 20 to 25, characterized in that: If the target downlink channel has one TCI state, and the number of the first TCI states is at least one, then the target TCI state is at least one first TCI state.

27. The method according to any one of claims 20 to 25, characterized in that, The type of the target downlink channel includes at least one of the following: Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), DL Reference Signal (RS) resource and PDCCH on the first CORESET, a channel scheduled or triggered by PDCCH on the first CORESET, and a channel associated with the first CORESET. The first CORESET includes at least one of the following: CORESET#0, CORESET that only associates with the public search space CSS, CORESET that only associates with the terminal-specific search space USS, and CORESET that associates with both USS and CSS.

28. The method according to claim 27, characterized in that: The PDCCH includes at least one of the following: All PDCCHs, PDCCHs on the terminal-specific control resource set CORESET, PDCCHs on the CORESET associated only with USS, PDCCHs on the CORESET associated only with CSS, PDCCHs on the CORESET associated with both USS and CSS, and PDCCHs on all other CORESETs except CORESET#0; And / or, The PDSCH includes at least one of the following: The PDSCH scheduled by the PDCCH, the PDSCH associated with the PDCCH, and the PDSCH dedicated to the terminal.

29. The method according to any one of claims 20 to 25, characterized in that, The transmission modes include: a preset transmission mode, a repeated transmission mode, a multi-beam simultaneous transmission mode, or a transmission mode that dynamically switches between the preset transmission mode, the repeated transmission mode, and the multi-beam simultaneous transmission mode, wherein the preset transmission mode is a single-beam transmission without repeated transmission. The network-side device determines the target TCI state of the target downlink channel based on the target information, including: The network-side device determines the target TCI state of the target downlink channel from the first TCI state based on the transmission mode of the target downlink channel; The method further includes: The network-side device sends a third indication information to the terminal, wherein the third indication information is used to indicate the transmission mode of the target downlink channel.

30. The method according to claim 20, characterized in that, If the number of the first TCI states is greater than 1, and the target downlink channel type is PDCCH and the transmission mode is repetitive transmission mode, then the target TCI states include at least one of the following: The first TCI state of the first identification information that corresponds to the first SS, wherein the first SS is at least two mutually associated SSs in which the target downlink channel is located; All of the first TCI states, wherein each of the first TCI states is applied to the target downlink channel transmitted on the interrelated SS according to the correspondence between the first TCI states and the first identification information; or, When the number of the first TCI states is equal to 1, if the type of the target downlink channel is PDCCH and the transmission mode is repetitive transmission mode, then the network-side device determines the target TCI state of the target downlink channel based on the target information, and further includes at least one of the following: The network-side device determines that the retransmission configuration of the target downlink channel has failed; The network-side device determines one of at least two mutually associated SSs containing the target downlink channel to transmit the target downlink channel; The network-side device determines one of at least two CORESETs corresponding to at least two mutually associated SSs containing the target downlink channel to transmit the target downlink channel; The network-side device determines to perform repeated PDCCH transmission based on the first TCI state; The network-side device determines that the target TCI state includes at least two existing TCI states of the target downlink channel. The network-side device determines to update the second preset TCI state of the original at least two TCI states of the target downlink channel to the first TCI state; wherein the second preset TCI state corresponds to the same first identification information as the first TCI state; or the second preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the second preset TCI state is associated with the first TCI state.

31. The method according to claim 30, characterized in that, In the multi-DCI mode, the CORESETs containing the at least two interconnected SSs are located in different CORESETPoolIndexes; In single DCI mode, the at least two interconnected SS correspond to different first identification information.

32. The method according to claim 31, characterized in that, Before the network-side device determines the target TCI state of the target downlink channel based on the target information, the method further includes: The network-side device sends first configuration information to the terminal; The first configuration information is used to configure the SS in CORESET corresponding to different first identification information to be mutually associated.

33. The method according to claim 20, characterized in that, If the number of the first TCI states is greater than 1, and the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, then the target TCI states include at least one of the following: At least two first TCI states of the CORESET where the target downlink channel is located; At least two first TCI states corresponding to at least two of the first identifier information; At least two TCI states of the target downlink channel determined according to the order or position of the first TCI states; All of the first TCI states; The first TCI state corresponding to the first PDCCH, the first PDCCH includes: a PDCCH that schedules the target downlink channel, or a PDCCH that schedules the target downlink channel and whose transmission mode is multi-beam simultaneous transmission mode, or any PDCCH, or any PDCCH whose transmission mode is multi-beam simultaneous transmission mode. or, When the number of the first TCI states is equal to 1, if the transmission mode of the target downlink channel is a multi-beam simultaneous transmission mode, the network-side device determines the target TCI state of the target downlink channel based on the target information, including at least one of the following: The network-side device determines that the configuration for simultaneous multi-beam transmission of the target downlink channel has failed. The network-side device determines that the target downlink channel is transmitted based on the first TCI state. The network-side device determines that the target TCI state includes at least two existing TCI states of the target downlink channel. The network-side device determines to update the third preset TCI state of the original at least two TCI states of the target downlink channel to the first TCI state; wherein the third preset TCI state corresponds to the same first identification information as the first TCI state; or the third preset TCI state is one of the original at least two TCI states of the target downlink channel located at a preset position; or the third preset TCI state is associated with the first TCI state.

34. The method according to claim 33, characterized in that, When the target TCI state includes at least two first TCI states, the method further includes: The network-side device determines the QCL parameters of the target downlink channel based on the target parameters, wherein the target parameters include all QCL parameters of the fourth preset TCI state among the at least two first TCI states, and the average delay parameter and delay spread parameter among the Class A QCL parameters of the other TCI states among the at least two first TCI states besides the fourth preset TCI state.

35. The method according to claim 20, characterized in that, When the target downlink channel is of type PDCCH and the transmission mode is a preset transmission mode, the target TCI state includes a fifth preset TCI state, wherein the fifth preset TCI state includes at least one of the following: All of the first TCI states arranged in a preset position; The first TCI state corresponding to the preset first identifier information; The first TCI state corresponding to the first identification information associated with the target downlink channel; The network-side device indicates the first TCI state from all the first TCI states.

36. The method according to claim 20, characterized in that, If the number of the first TCI states is greater than 1, and the target downlink channel type is PDSCH or DL ​​RS resource, then the target TCI state includes at least one of the following: All of the first TCI states; The network-side device indicates at least one first TCI state from all the first TCI states; Sixth preset TCI state; The sixth preset TCI state includes at least one of the following: At least one of the first TCI state corresponding to the first code point or the first TCI state corresponding to the first code point, wherein the first code point is the code point indicated by the TCI field in the DCI indicating the first TCI state. The first TCI state corresponding to the preset first identifier information; The first TCI state is the same as the TCI state of the PDCCH where the DCI of the target downlink channel is located; The first TCI state corresponding to the first identifier information associated with the PDCCH where the DCI of the target downlink channel is located; The first TCI state corresponding to the first identifier information associated with the target downlink channel; The first TCI state is determined based on the second code point indicated by the network-side device and is dedicated to the target downlink channel. The second code point is the code point indicated by the TCI field in the DCI that schedules the target downlink channel, and the first TCI state corresponding to the second code point is a subset or the entire set of the first TCI states corresponding to the first code point. The same first TCI state as the PDCCH used for repeated transmission or multi-beam simultaneous transmission, or at least one of the first TCI states used for repeated transmission or multi-beam simultaneous transmission of PDCCH, wherein the PDCCH used for repeated transmission or multi-beam simultaneous transmission is the PDCCH in which the DCI indicating the first TCI state is located, or the PDCCH that schedules the target downlink channel. The network-side device determines the target TCI state, including the TCI state of the PDCCH that schedules or triggers the target downlink channel; When the target downlink channel has at least two existing TCI states, the network-side device determines the target TCI state as either one of the existing at least two TCI states of the target downlink channel, or the first TCI state; or, the terminal determines to update the seventh preset TCI state among the existing at least two TCI states of the target downlink channel to the first TCI state; wherein the seventh preset TCI state corresponds to the same first identification information as the first TCI state; or the seventh preset TCI state is one of the existing at least two TCI states of the target downlink channel located at a preset position; or the seventh preset TCI state is associated with the first TCI state.

37. The method according to claim 20, characterized in that, The transmission mode of the target downlink channel is a repetitive transmission mode, or the type of the target downlink channel is a PDSCH or DL ​​RS resource and the target DCI scheduling the target downlink channel simultaneously schedules at least two PDSCH or at least two DL RS resources. After the terminal obtains the common beam information indicated by the network-side device, the method further includes: The network-side device receives first feedback information from the terminal, the first feedback information being used to indicate that the terminal has correctly received the common beam information; The network-side device configures the public beam information to take effect based on the first feedback information; The network-side device determines whether the target downlink channel is repeatedly transmitted in a time slot after the second time or whether the PDSCH or DL ​​RS resources scheduled by the target DCI in a time slot after the second time are transmitted using the common beam information, wherein the second time is the effective time of the common beam information.

38. A downlink TCI state determination device, characterized in that, Applied to network-side devices, the device includes: The indication module is used to indicate the common beam information of the terminal to the terminal. The common beam information includes N first transmission configuration indication (TCI) states, where the first TCI state is either a joint TCI state or an independent downlink DL TCI state, and N is an integer greater than or equal to 1. The second determining module is used to determine the target TCI state of the target downlink channel based on the target information, wherein the target information includes at least one of the following: The number of the first TCI states; The order or position of the first TCI states; The correspondence between the first TCI state and the first identification information; The type of the target downlink channel; The transmission mode of the target downlink channel; The time-domain behavior of the target downlink channel or the time-domain behavior of the information carried by the target downlink channel; The number of the first identification information corresponding to the target downlink channel; The value of the first identifier information corresponding to the target downlink channel; The first identification information includes at least one of the following: Control resource set CORESET identification information; Identification information of interrelated search spaces (SS), which are used for repeated transmission of PDCCH; The identification information of the CORESET where the interrelated SSs are located; The transmission timing information or transmission time information of the interconnected SS; CORESET pool identification CORESETPoolIndex; Send the TRP identifier ID information of the receiving point; Channel group identification information; CORESET group identification information; Physical Uplink Control Channel (PUCCH) resource group identification information; The second determining module is specifically used for: If the number N of the first TCI states is greater than the number K of the TCI states required by the target downlink channel, K first TCI states arranged in a preset position are determined as the target TCI states of the target downlink channel; or, K first TCI states are determined as the target TCI states from all the first TCI states, and second indication information is sent to the terminal, wherein the second indication information is used to indicate the TCI states, and the TCI states indicated by the second indication information include K first TCI states from the N first TCI states; If the target downlink channel has M TCI states, and the number N of the first TCI states is at least M, then the target TCI state is determined to be at least M of the first TCI states, where M is an integer greater than or equal to 2. If the target downlink channel has M TCI states, and the number N of the first TCI states is less than M, the target TCI state is determined to be the original M TCI states of the target downlink channel, or the target TCI state is the original (MN) TCI states of the target downlink channel and the N first TCI states; or the target TCI state is the N first TCI states. If the number of the first TCI states is equal to 1, and the type of the target downlink channel is PDSCH or DL ​​RS resource, and the target downlink channel corresponds to the same first identification information as the first TCI state, then the target TCI state is determined to include the first TCI state. If the number of the first TCI states is equal to 1, the type of the target downlink channel is PDSCH or DL ​​RS resource, and the target downlink channel corresponds to different first identification information than the first TCI states, then it is determined that the target TCI state includes the original TCI state of the target downlink channel or that the target downlink channel stops transmitting.

39. A terminal, characterized in that, It includes a processor and a memory, the memory storing a program or instructions that can run on the processor, the program or instructions being executed by the processor to implement the steps of the downlink TCI state determination method as described in any one of claims 1 to 18.

40. A network-side device, characterized in that, It includes a processor and a memory, the memory storing a program or instructions that can run on the processor, the program or instructions being executed by the processor to implement the steps of the downlink TCI state determination method as described in any one of claims 20 to 37.

41. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the downlink TCI state determination method as described in any one of claims 1 to 18, or implement the steps of the downlink TCI state determination method as described in any one of claims 20 to 37.

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