Method and Device for Transmitting Physical Downlink Control Channel

Abstract

An embodiment of the present application provides a method and device for transmitting a physical downlink control channel, which is applied to the field of communication technologies. The embodiment of the present application includes: a second device transmits a PDCCH on a first CORESET; correspondingly, a first device receives the PDCCH on the first CORESET, and the DMRS of the PDCCH corresponds to N active TCI-States. In this solution, the enhancement of the PDCCH is achieved by adopting a multi-TRP transmission mode to transmit the PDCCH, so as to improve the performance of the first device in receiving the PDCCH.

Description

[0001] This application is a divisional application of the invention patent application with the application date of March 24, 2021, application number 202180092874.2, and invention title "Method and Device for Transmitting Physical Downlink Control Channel". Technical Field

[0002] This application relates to the field of communication technologies, and in particular, to a method and device for transmitting a physical downlink control channel. Background Art

[0003] The 5th generation (5G) mobile communication is also known as new radio (NR) mobile communication. Compared with the long term evolution (LTE) system, the NR system supports a larger transmission bandwidth, more transceiver antenna arrays, a higher transmission rate, and a more flexible and finer-grained scheduling mechanism.

[0004] A common transmission mode in the 5G mobile communication system is multi-transmission and reception point (TRP) transmission. Multi-TRP transmission means that multiple TRPs communicate with the same terminal device simultaneously on the same carrier. Multi-TRP transmission is usually used for the transmission of the physical downlink shared channel (PDSCH). Based on multi-TRP transmission, multiple TRPs send downlink control information (DCI) to the same terminal device, thereby implementing the PDSCH multi-TRP enhancement scheme.

[0005] To improve the performance of a terminal device in receiving the physical downlink control channel (PDCCH), it is now considered to use the multi-TRP transmission mode to transmit the PDCCH. Therefore, how to implement the enhancement of the PDCCH by using the multi-TRP transmission mode is an urgent problem to be solved. Summary of the Invention

[0006] Embodiments of this application provide a method and device for transmitting a physical downlink control channel, and achieve the purpose of improving the performance of a terminal device in receiving the PDCCH by using the multi-TRP transmission mode to transmit the PDCCH.

[0007] In a first aspect, embodiments of this application provide a method for transmitting a physical downlink control channel, including:

[0008] The first device receives a Physical Downlink Control Channel (PDCCH) on a first Control Resource Set (CORESET), and the Demodulation Reference Signal (DMRS) of the PDCCH corresponds to N active Transmission Configuration Indication (TCI) - States, where N ≥ 2 and N is an integer.

[0009] In a second aspect, an embodiment of the present application provides a method for transmitting a Physical Downlink Control Channel, including:

[0010] A second device transmits a Physical Downlink Control Channel (PDCCH) to a second device on a first Control Resource Set (CORESET), and the Demodulation Reference Signal (DMRS) of the PDCCH corresponds to N active Transmission Configuration Indication (TCI) - States, where N ≥ 2 and N is an integer.

[0011] In a third aspect, an embodiment of the present application provides a first device, including: a memory storing executable program code; a transceiver and a processor coupled to the memory; the processor and the transceiver are used to execute the method described in the first aspect of the embodiments of the present application.

[0012] In a fourth aspect, an embodiment of the present application provides a second device, including: a memory storing executable program code; a transceiver and a processor coupled to the memory; the processor and the transceiver are used to execute the method described in the second aspect of the embodiments of the present application.

[0013] In a fifth aspect, an embodiment of the present application provides a computer - readable storage medium, including instructions, which when running on an electronic device, cause the electronic device to execute the method described in the first aspect or the second aspect above.

[0014] In a sixth aspect, an embodiment of the present application provides a computer program product containing instructions, which when running on an electronic device, cause the electronic device to execute the method described in the first aspect or the second aspect of the present application.

[0015] In a seventh aspect, an embodiment of the present application provides a chip, which is coupled to a memory in an electronic device, such that when the chip runs, it calls program instructions stored in the memory to execute the method described in the first aspect or the second aspect above.

[0016] In the method and device for transmitting a Physical Downlink Control Channel provided by the embodiments of the present application, the second device transmits a PDCCH on the first CORESET; correspondingly, the first device receives the PDCCH on the first CORESET, and the DMRS of the PDCCH corresponds to N active TCI - States. In this solution, by adopting a multi - TRP transmission mode to transmit the PDCCH, the enhancement of the PDCCH is realized, and the purpose of improving the performance of the first device in receiving the PDCCH is achieved. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the network architecture of the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0018] Figure 2A It is a schematic diagram of multi-TRP transmission in the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0019] Figure 2B It is a schematic diagram of multi-beam transmission in the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0020] Figure 3 It is a flowchart of the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0021] Figure 4 It is another flowchart of the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0022] Figure 5 It is yet another flowchart of the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0023] Figure 6 It is a flowchart of the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0024] Figure 7 It is yet another flowchart of the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0025] Figure 8 It is a schematic diagram of the first MAC CE signaling in the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0026] Figure 9 It is another schematic diagram of the first MAC CE signaling in the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0027] Figure 10 It is yet another schematic diagram of the first MAC CE signaling in the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0028] Figure 11 It is yet another schematic diagram of the first MAC CE signaling in the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0029] Figure 12 It is yet another flowchart of the method for transmitting the physical downlink control channel provided by an embodiment of the present application;

[0030] Figure 13 It is a schematic diagram of the structure of a first device provided by an embodiment of the present application;

[0031] Figure 14 It is a schematic structural diagram of another first device provided by an embodiment of the present application;

[0032] Figure 15 It is a schematic structural diagram of a second device provided by an embodiment of the present application;

[0033] Figure 16 It is a schematic structural diagram of another second device provided by an embodiment of the present application. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0035] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly, using words such as "exemplary" or "for example" aims to present related concepts in a specific manner.

[0036] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The symbol " / " in this article represents that the associated objects are in an "or" relationship, for example, A / B represents A or B.

[0037] Currently, the design goals of 5G mobile communication systems include large-bandwidth communication in high-frequency bands, and high-frequency bands are, for example, bands above 60 GHz. When the operating frequency becomes higher, the path loss parameter of the transmission path increases, thus affecting the coverage ability of high-frequency systems. To effectively ensure the coverage of high-frequency band NR systems, an effective solution is the multiple-input multiple-output (Massive MIMO) scheme based on a large-scale antenna array. This scheme uses multiple beam (multiple beam) technology to improve the coverage ability. Among them, the beam is also called a hybrid beam, or less strictly called an analog beam, etc.

[0038] Generally speaking, in traditional 2G, 3G, and 4G communication systems, a cell uses a relatively wide beam to cover the entire cell, and a cell is also called a sector, etc. Therefore, terminal devices within the cell coverage area all have the opportunity to obtain transmission resources allocated by the system. Among them, terminal devices are also called user equipment (UE), etc.

[0039] In a 5G communication system, the entire cell is covered by multi-beams, that is, each cell covers a relatively small area, and the effect of multiple beams covering the entire cell is achieved through time sweeping. Terminal devices identify the beams through the signals carried on the beams.

[0040] For example, different synchronization signal blocks (Synchronization Signal / PBCH Block, SSB) are transmitted on different beams. Terminal devices distinguish different beams through different SSBs. SSB can also be expressed as SS Block, SS / PBCH block.

[0041] Another example is that different channel state information reference signals (Channel state information reference signal, CSI-RS) are transmitted on different beams. Terminal devices identify different beams through different CSI-RSs or CSI-RS resources.

[0042] Based on the above, it can be known that: in the actual implementation of the system, the beam actually corresponds to the visible signal. Therefore, the discussion of the signal implicitly includes the discussion of the beam.

[0043] In a multi-beam system, both PDCCH and PDSCH can be transmitted through different downlink transmission beams. For systems below 6G, since terminal devices do not have analog beams, terminal devices use omnidirectional antennas (or nearly omnidirectional antennas) to receive signals transmitted by different downlink beams on the network side. For millimeter-wave systems, there may be analog beams on the terminal device side. Therefore, terminal devices can use downlink receiving beams to receive corresponding signals. At this time, corresponding beam indication information is required to assist terminal devices in determining relevant information about the transmission beams on the network side, or terminal devices use the corresponding beam indication information to determine relevant information about the receiving beams.

[0044] In the NR protocol, the beam indication information does not directly indicate the beam itself, but is indicated through the Quasi co-location (QCL) assumption between signals. For a terminal device, the terminal device receives the corresponding signals / channels based on the QCL assumption. Among them, the QCL assumption is indicated by the Transmission Configuration Indicator (TCI-State). The network side configures and / or indicates the TCI-state through relevant signaling. The relevant signaling is, for example, Radio Resource Control (RRC) signaling, Media Access Control Control Element (MAC CE), or Downlink Control Information (DCI), etc.

[0045] In version 16 (R16) of NR, it is proposed to use multi-TRP transmission to enhance the PDSCH. Multi-TRP transmission means that on the same carrier, multiple TRPs communicate with a certain terminal device at the same time. Since in the NR system, for multi-TRP transmission, or multiple panels or multiple beams transmitting to a terminal at the same time, the same scheme can be adopted, so in the description, they are often not distinguished (for example, collectively referred to as multi-TRP transmission, or written as multiple TRP / panel / beam transmissions). The enhancement of PDSCH using multi-TRP transmission includes the following two schemes:

[0046] The first one: the single-PDCCH based scheme.

[0047] In this scheme, the terminal device only detects one PDCCH. Based on this detection, a DCI is obtained, and this DCI is used to indicate the relevant information of the data transmitted simultaneously on multiple TRPs. In this scheme, from the protocol perspective, the terminal device cannot see that it is multi-TRP transmission, but only sees that one transmission corresponds to multiple TCI-States. That is to say, the first scheme implicitly indicates multi-TRP transmission through multiple TCI-States. The second one: the multiple-PDCCH based scheme.

[0048] In this solution, the terminal device receives different PDCCHs from multiple TRPs. Then, the terminal device detects these PDCCHs to obtain the DCI carried by each PDCCH. Each DCI is used to indicate the relevant indication information of a data transmission. The terminal device cannot see from the protocol layer that it is multiple TRPs transmitting. It can only see that the control resource set (CORESET) corresponding to the DCI scheduling the data may be associated with different CORESET resource pool numbers, that is, different DCIs correspond to different control resource set pool indices (coresetPoolIndex). That is to say, the second solution implicitly indicates multi-TRP transmission through multiple different coresetPoolIndices.

[0049] In the above first and second solutions, since the PDCCH is the PDCCH sent by the network side to the terminal device in the NR system, the PDCCH is also called NR-PDCCH.

[0050] Compared with the second solution, in the above first solution, the terminal device only needs to detect one PDCCH, and the control channel detection complexity is relatively low. However, this solution requires that different TRPs can quickly exchange information.

[0051] In the above second solution, the terminal device needs to simultaneously detect multiple PDCCHs on the same carrier, and the complexity is relatively high, but the flexibility and robustness will be improved.

[0052] Possible application scenarios of the above second solution are, for example, the following S1-1-S1-4:

[0053] S1-1. Multiple TRPs belong to the same cell, and the connection (backhaul) between each TRP is ideal. That is to say, each TRP can quickly exchange information.

[0054] S1-2. Multiple TRPs belong to the same cell, and the connection (backhaul) between each TRP is non-ideal. That is to say, each TRP cannot quickly exchange information and can only perform relatively slow data interaction.

[0055] S1-3. Multiple TRPs belong to different cells, and the connection (backhaul) between each TRP is ideal.

[0056] S1-4. Multiple TRPs belong to different cells, and the connection (backhaul) between each TRP is non-ideal.

[0057] In addition, since multi-beam transmission, multi-antenna panel transmission, and multi-TRP transmission are similar. Therefore, multi-beam can be used to replace multi-TRP in S1-1 - S1-4 above, resulting in four application scenarios of multi-beam. Similarly, replacing multi-TRP in S1-1 - S1-4 above with a multi-antenna panel results in four application scenarios of multi-antenna panel.

[0058] The first solution above is only applicable to the scenario of ideal backhaul, that is, scenarios S1-1 and S1-3 above.

[0059] Currently, in the NR system, the transmission scheme of the physical downlink channel is as follows:

[0060] The network side indicates the transmission of PDCCH by configuring a control resource set (CORESET) and a search space. Among them, the search space is also called a search space set, etc. The control resource set includes multiple physical resource blocks in the frequency domain and 1 - 3 OFDM symbols in the time domain. The time domain resources occupied by the CORESET are semi-statically configured by a high-layer parameter. The search space is a set of PDCCH candidates (PDCCH candidate) at one or more aggregation levels. The aggregation level of the actually transmitted PDCCH by the base station is determined by the base station. Since there is no relevant signaling to inform the UE, the UE needs to blindly detect the PDCCH at different aggregation levels. Among them, the PDCCH to be blindly detected is called a candidate PDCCH. The UE will decode the candidate PDCCH within the search space. If the CRC check passes, it is considered that the content of the decoded PDCCH is valid for the UE, and subsequent operations are performed using the information obtained by decoding.

[0061] In NR, within each downlink BWP of each serving cell, the network side can configure up to 10 search space sets for a user. The time domain configuration information is configured in the search space set to indicate the time domain position for the user to detect the PDCCH. At the same time, the network side configures a CORESET ID associated with each search space set. Through the CORESET ID, the user can obtain the physical resources of the search space set in the frequency domain. Each search space set has a uniquely associated CORESET ID. Different search space sets can be associated with the same CORESET ID. The UE determines the time-frequency domain position of the PDCCH candidate based on the time domain given by the search space set, the frequency domain of the associated CORESET ID, and other parameters in the search space set.

[0062] When the network configures a CORESET, one or more tci states are configured for each CORESET. The tci state is used to indicate the relevant parameters required for the user to perform demodulation detection on the PDCCH candidates in the Search Space associated with the CORESET. When the network configures multiple tci states for a certain CORESET, the network will activate one tci state for the CORESET through MAC CE signaling to assist the terminal device in demodulating this PDCCH.

[0063] In addition, the network also configures a higherlayer index (i.e., CORESET pool index, and the corresponding name in RRC is coresetPoolIndex) for each CORESET to indicate whether it is the same CORESET pool. The value range of this value is 0 and 1. In implementation, one CORESET pool can correspond to one TRP. For example, for CORESETs configured with the same higherlayer index, users consider that this is data from the same TRP. From the protocol, one can only see whether different CORESET pool indexes are associated, and cannot see the physical entity of the TRP.

[0064] According to the above, in R15 and R16 versions, multi-TRP transmission is adopted to achieve the enhancement of PDSCH. And the above solution of adopting multi-TRP transmission to achieve PDSCH enhancement is for the case on the same carrier. For example, in the second solution above, the terminal device detects multiple PDCCHs on the same carrier to obtain multiple DCIs. Among them, the number of DCIs is usually 2. Each DCI can schedule the corresponding PDSCH, and multiple PDSCHs are also on the same carrier.

[0065] However, in version 17 (R17), it is proposed to adopt multi-TRP transmission to achieve the enhancement of the Physical Downlink Control Channel (PDCCH). However, the industry has not proposed a suitable solution. Therefore, how to achieve the enhancement of PDCCH by adopting multi-TRP transmission mode is an urgent problem to be solved.

[0066] Based on this, the embodiments of the present application provide a method, a communication device and equipment for transmitting the Physical Downlink Control Channel, and by adopting multi-TRP transmission mode to transmit PDCCH, the purpose of improving the performance of the terminal device receiving PDCCH is achieved.

[0067] The method for transmitting a physical downlink control channel provided by the embodiments of this application can be used in various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced long term evolution (LTE-A) system, New Radio (NR) system, evolved system of the NR system, LTE-based access to unlicensed spectrum (LTE-U) system, NR-based access to unlicensed spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), 5th-Generation (5G) system, future evolved system or various communication convergence systems, etc. It can include various application scenarios, such as machine to machine (M2M), device to device (D2D), Vehicle to Everything (V2X), sidelink communication and other communication systems.

[0068] Optionally, the communication system in the embodiments of this application can be applied to a Carrier Aggregation (CA) scenario, can also be applied to a Dual Connectivity (DC) scenario, and can also be applied to a Standalone (SA) networking scenario.

[0069] The embodiments of the present application describe various embodiments in combination with a first device and a second device. Herein, the first device may also be referred to as a terminal device, a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile device, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device, etc.

[0070] The first device may be a station (STAION, ST) in a WLAN, and may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device with wireless communication function, a computing device, or other processing devices connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a next-generation communication system such as an NR network, or a terminal device in a future evolved Public Land Mobile Network (PLMN) network, etc.

[0071] In the embodiments of the present application, the first device may be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it may also be deployed on water (such as a ship, etc.); it may also be deployed in the air (such as an airplane, a balloon, a satellite, etc.).

[0072] In the embodiments of the present application, the first device may be a mobile phone, a tablet (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city, or a wireless terminal device in smart home, etc.

[0073] By way of example and not limitation, in the embodiments of the present application, the first device may also be a wearable device. A wearable device, also known as a wearable intelligent device, is a general term for devices developed by applying wearable technologies to the intelligent design of daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that can be directly worn on the body or integrated into the user's clothes or accessories. A wearable device is not just a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable intelligent devices include those with complete functions and large sizes that can realize complete or partial functions without relying on a smart phone, such as smart watches or smart glasses, etc., and those that only focus on a certain type of application function and need to cooperate with other devices such as smart phones, such as various smart bracelets and smart jewelry for physical sign monitoring.

[0074] In the embodiments of the present application, the second device may be a device for communicating with a mobile device. The second device may be an access point (AP) in a WLAN, a base transceiver station (BTS) in GSM or CDMA, a NodeB (NB) in WCDMA, an evolved Node B (eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and a network device (gNB) in an NR network or a network device in a future evolved PLMN network or a network device in an NTN network, etc. In scenarios such as V2X communication or D2D communication, the second device may also be a terminal device.

[0075] By way of example and not limitation, in the embodiments of the present application, the second device may have mobility characteristics. For example, the network device may be a mobile device. Optionally, the second device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. Optionally, the second device may also be a base station located on land, water, etc.

[0076] In an embodiment of the present application, the second device can provide services to a cell, and the first device communicates with the second device through the transmission resources used by the cell (for example, frequency domain resources, or in other words, spectrum resources). The cell can be a cell corresponding to the second device (such as a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. Here, small cells can include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage range and low transmission power, and are suitable for providing high-rate data transmission services.

[0077] Figure 1 is a schematic diagram of the network architecture of the method for transmitting a physical downlink control channel provided in an embodiment of the present application. Please refer to Figure 1 , the terminal device 11 and the network device 15 form a multi-TRP transmission system. In this scenario, the network device 15 is, for example, a base station, a transmission and reception point, etc. The terminal device 14, the terminal device 12, and the terminal device 13 form a multi-TRP transmission system. In this scenario, the terminal device 14 and the terminal device 12 can be regarded as the second device, and the terminal device 13 can be regarded as the first device, which is applicable to scenarios such as D2D and V2X.

[0078] Since in the NR system, the same scheme can be adopted for multi-TRP transmission, multi-antenna panel transmission, and multi-beam transmission. Therefore, although Figure 1 in the architecture shown, only multi-TRP transmission is schematically shown. However, it can be understood that the embodiments of the present application are equally applicable to multi-antenna panel transmission and multi-beam transmission. Among them, multi-antenna panel transmission can also be referred to as multi-panels transmission.

[0079] Figure 2A is a schematic diagram of multi-TRP transmission in the method for transmitting a physical downlink control channel provided in an embodiment of the present application. Please refer to Figure 2A , TRP21 and TRP22 simultaneously transmit PDCCH to the first device.

[0080] Figure 2B is a schematic diagram of multi-beam transmission in the method for transmitting a physical downlink control channel provided in an embodiment of the present application. Please refer to Figure 2B , two beams of the gNB simultaneously transmit PDCCH to the first device.

[0081] Next, based on the above Figure 1 , Figure 2A and Figure 2B , the method for transmitting a physical downlink control channel provided by the present application will be described in detail. Specifically, please refer toFigure 3 。 Figure 3 This is a flowchart for transmitting a physical downlink control channel provided by an embodiment of the present application. This embodiment is described from the perspective of the interaction between a second device and a first device. This embodiment includes:

[0082] 301. The first device receives a physical downlink control channel (PDCCH) from the second device on a first control resource set (CORESET). The demodulation reference signal (DMRS) of the PDCCH corresponds to N active transmission configuration indicator states (TCI-States), where N≥2 and is an integer.

[0083] Exemplarily, the second device is, for example, a network device or a terminal device. When the second device is a terminal device, the above-mentioned PDCCH is control channel information transmitted between terminal devices.

[0084] The first CORESET includes multiple physical resource blocks in the frequency domain and includes one or more orthogonal frequency division multiplexing (OFDM) symbols in the time domain. The first CORESET is, for example, configured by the network for the first device; or, in scenarios such as D2D, the first CORESET is configured by the network or the second device for the first device. When the second device configures the first CORESET for the first device, it configures N active TCI-States for the first CORESET, or it can also pre-configure the first CORESET for the first device and then configure N active TCI-States for the first CORESET.

[0085] Optionally, in an embodiment of the present application, there are, for example, multiple second devices.

[0086] Please refer to Figure 2A , in multi-TRP transmission, there are multiple second devices, for example, 2 or more. Multiple second devices send PDCCH on the first CORESET; correspondingly, the first device receives PDCCH on the first CORESET.

[0087] Please refer to Figure 2B , in multi-beam transmission, the second device is, for example, a beam, and 2 or more beams send PDCCH on the first CORESET. Correspondingly, the first device receives PDCCH from the second device on the first CORESET.

[0088] In addition, in multi-panel transmission, the second device is, for example, a panel, and two or more panels send PDCCH on the first CORESET. Correspondingly, the first device receives the PDCCH from the second device on the first CORESET.

[0089] 302. The first device receives the PDCCH according to the N active TCI-States.

[0090] After receiving the PDCCH, the first device receives the PDSCH and sends the PUSCH according to the DCI carried by the PDCCH.

[0091] For the scenario of communication between a terminal device and a network device, the first device above is, for example, a terminal device, and the second device is, for example, a network device. For D2D, V2X, and sidelink communication, both the first device and the second device above are terminal devices.

[0092] In the method for transmitting a physical downlink control channel provided by the embodiments of the present application, the second device sends the PDCCH on the first CORESET; correspondingly, the first device receives the PDCCH on the first CORESET, and the DMRS of the PDCCH is for N active TCI-States. In this solution, the enhancement of the PDCCH is achieved by adopting a multi-TRP transmission mode to transmit the PDCCH, so as to improve the performance of the first device in receiving the PDCCH.

[0093] Optionally, in the above embodiment, the PDCCH corresponds to a first search space, and the first search space is a specific search space USS of the first device.

[0094] Exemplarily, the first search space is a specific search space (UE specific searchspace, USS) of the first device. The search space type of the first search space is configured as ue-Specific.

[0095] Adopting this solution, the multi-TRP transmission is configured for the PDCCH transmission of the first device's specific search space, and single-TRP transmission or multi-TRP transmission can be independently allocated for each first device, improving the flexibility of the entire communication system.

[0096] Optionally, in the above embodiment, the TCI-State includes the following information: the status identifier ID of the TCI-State, which is used to identify the status of the TCI-State; the first quasi co-location QCL.

[0097] Exemplarily, when the first device performs signal reception, in order to improve the reception performance, the characteristics of the transmission environment corresponding to the data transmission can be utilized to improve the reception algorithm. For example, the first device utilizes the statistical characteristics of the channel to optimize the design and parameters of the channel estimator. In the NR system, these characteristics corresponding to the data transmission are represented by QCL information (QCL-Info).

[0098] During the downlink transmission, if the downlink transmission comes from different TRPs (beam or panel), the characteristics of the transmission environment corresponding to the data transmission may also change. Therefore, in the NR system, when the second device transmits PDCCH or PDSCH, it will indicate the corresponding QCL information to the first device through the TCI-State.

[0099] Among the above N active TCI-States, each TCI-State includes the following configurations:

[0100] TCI state identity (Identity document, ID), used to identify a TCI state;

[0101] The first QCL information.

[0102] Optionally, among the above N active TCI-States, each TCI-State may further include the second QCL information.

[0103] Optionally, if the first device is in the high frequency band, the TCI-State in the N active TCI-States includes the first QCL information and the second QCL information, and the first QCL information is used for; if the first device is in the low frequency band, the TCI-State in the N active TCI-States only includes the first QCL. For example, in the high frequency band, the QCL type of the first QCL information is QCL-TypeA, and the QCL type of the second QCL information is QCL-TypeD. In the low frequency band, the QCL type of the first QCL is QCL-TypeA.

[0104] Each QCL information further includes the following information:

[0105] QCL type configuration, which can be one of QCL type (type) A, QCL typeB, QCL typeC or QCL typeD.

[0106] QCL reference signal configuration, including the cell ID where the reference signal is located, the Bandwidth Part (BWP) ID, and the identity of the reference signal. Among them, the identity of the reference signal is, for example, the CSI-RS resource ID or the SSB index.

[0107] If an active TCI-State contains both the first QCL information and the second QCL information, then the QCL type of at least one of the first QCL information and the second QCL information must be typeA, typeB, or typeC. The QCL type of the other QCL information must be typeD.

[0108] Among them, the definitions of different QCL types are as follows:

[0109] QCL-typeA: Doppler shift, Doppler spread, average delay, delay spread;

[0110] QCL-typeB: Doppler shift, Doppler spread;

[0111] QCL-typeC: Doppler shift, average delay;

[0112] QCL-typeD: Spatial Rx parameter.

[0113] QCL-typeD is used to indicate the beam, and QCL-TypeA, QCL-TypeB, QCL-TypeC are used to indicate channel statistics, etc.

[0114] In this description, QCL-TypeA, QCL-TypeB, QCL-TypeC, and QCL-TypeD are often abbreviated as typeA, typeB, typeC, and typeD respectively.

[0115] In the NR system, the network side can indicate the corresponding TCI-State for the downlink signal or downlink channel.

[0116] If the network side configures the QCL reference signal of the target downlink channel or target downlink signal as the Synchronization Signal Block (SSB) through the TCI-State, and the QCL type is QCL-typeA, QCL-typeB, or QCL-typeC; or, the network side configures the QCL reference signal of the target downlink channel or target downlink signal as the CSI-RS resource through the TCI-State, and the QCL type is QCL-typeA, QCL-typeB, or QCL-typeC. At this time, the first device assumes that the large-scale parameters of all target downlink signals are the same as those of the SSB or CSI-RS resource. Among them, the large-scale parameters are determined by the QCL type.

[0117] If the network side configures the QCL reference signal of the target downlink channel or downlink signal as the SSB or CSI-RS resource through the TCI state, and the QCL type is typeD, the first device uses the same receiving beam (i.e., Spatial Rx parameter) as that for receiving the SSB or CSI-RS resource to receive the target downlink signal. Generally, the target downlink channel (or downlink signal) and its SSB or CSI-RS resource are transmitted by the same TRP or the same panel or the same beam on the network side. If the transmission TRP or transmission panel or transmission beam of two downlink signals or downlink channels is different, different TCI states are usually configured.

[0118] For the downlink control channel, the TCI state of the corresponding CORESET can be indicated by means of RRC signaling or a combination of RRC signaling and MAC signaling.

[0119] In the embodiments of the present application, the TCI-State is used to indicate the information related to the uplink or downlink transmission configuration. Although the above is introduced by taking the downlink as an example. However, the embodiments of the present application are not limited. In other feasible implementation manners, the TCI-State described in the embodiments of the present application can indicate the information related to the uplink and downlink transmission configurations simultaneously, or the TCI-State indicates the information related to the uplink transmission configuration.

[0120] Optionally, in the above embodiments, the PDCCH is transmitted from different beams among multiple beams, and different beams among the multiple beams correspond to different TCI-States among the N active TCI-States; or, the PDCCH is transmitted from different transmit-receive points among multiple transmit-receive points, and different transmit-receive points among the multiple transmit-receive points correspond to different TCI-States among the N TCI-States.

[0121] Exemplarily, the method for transmitting the PDCCH provided in the embodiments of the present application can be applied to multi-TRP transmission, multi-beam transmission or multi-panel transmission. Therefore, the above PDCCH is transmitted from different TRPs, different beams or different panels. When the above PDCCH is transmitted from different TRPs, different TRPs among the multiple TRPs correspond to different active TCI-States among the N active TCI-States. When the above PDCCH is transmitted from different beams, different beams among the multiple beams correspond to different active TCI-States among the N active TCI-States. When the above PDCCH is transmitted from different panels, different panels among the multiple panels correspond to different active TCI-States among the N active TCI-States.

[0122] Optionally, in the above embodiments, the N active TCI-States include a first TCI-State and a second TCI-State, and the types of quasi-co-location in the first TCI-State and the second TCI-State are the same.

[0123] For example, the types of QCL information in the first TCI-State and the second TCI-State are both TypeA; for another example, the types of QCL information in the first TCI-State and the second TCI-State include TypeA and TypeD; for yet another example, the types of QCL information in the first TCI-State and the second TCI-State both include TypeD.

[0124] Adopting this solution, by using the same QCL type, the first device can use similar processing algorithms to receive signals from different second devices, thereby reducing the implementation complexity of the first device.

[0125] Optionally, in the above embodiments, the first CORESET includes a plurality of physical resource blocks in the frequency domain and includes 1-3 orthogonal frequency division multiplexing (OFDM) symbols in the time domain, and the first CORESET is associated with at least one search space.

[0126] Exemplarily, the second device configures the first CORESEST to indicate the transmission of the PDCCH. The first CORESEST includes a plurality of physical resource blocks in the frequency domain and includes 1-3 OFDM symbols in the time domain. The time domain resources occupied by the first CORESEST are semi-statically configured by a higher layer parameter. The first CORESET is associated with at least one search space, and the search space is a set of PDCCH candidates (PDCCH candidate) at one or more aggregation levels. The aggregation level of the PDCCH actually sent by the second device is variable over time. Since there is no relevant signaling to inform the first device, the first device needs to blindly detect the PDCCH at different aggregation levels. Among them, the PDCCH to be blindly detected is called a candidate PDCCH. The first device will decode the candidate PDCCH within the search space. If the cyclic redundancy check (CRC) passes, it is considered that the content of the decoded PDCCH is valid for the first device, and the information obtained by decoding is used for subsequent operations.

[0127] Optionally, in the above embodiments, the control resource set pool index (coresetPoolIndex) corresponding to the first CORESET is not configured. That is to say, in the relevant protocol, the coresetPoolIndex field is not configured. For example, coresetPoolIndex-r16 is not configured. For specific details, refer to the description of the relevant protocol in the third configuration information below. The control resource set pool index is an RRC parameter corresponding to the first CORESET. The advantage of not configuring this RRC parameter is to avoid the mixed use of multiple solutions, effectively reduce the complexity of signaling configuration, and the implementation complexity of the first device and the second device.

[0128] Optionally, in the above embodiments, the downlink control information (DCI) corresponding to the first CORESET, that is, the indication field of the TCI carried by the PDCCH, is at least 1 bit. For example, the indication field of the TCI is 3 bits. In this solution, the TCI state of the scheduled data transmission is indicated by the indication field of the TCI, avoiding complex default QCL assumption rules, and effectively reducing the complexity of the protocol and the implementation complexity of the first device.

[0129] Optionally, the DCI carried by the above PDCCH is used to schedule the PDSCH or PUSCH.

[0130] Optionally, in the above embodiments, when the DCI carried by the PDCCH is used to schedule the PUSCH, the indication field of the TCI also indicates the spatial domain transmission filter corresponding to the uplink transmission. In this way, by using the indication field of the TCI to indicate the uplink transmission beam, the unification of uplink and downlink beam indication can be achieved, thereby reducing the signaling overhead and the implementation complexity of the first device.

[0131] Optionally, in the above embodiments, the DCI carried by the PDCCH can also schedule the SRS or CSI feedback, etc.

[0132] Optionally, in the above embodiments, the transmission configuration indication information tci-PresentInDCI corresponding to the first CORESET is in an enabled state. That is, tci-PresentInDCI is an RRC parameter corresponding to the first CORESET, and this parameter is in an enabled state.

[0133] Optionally, in the above embodiments, the transmission configuration indication information tci-PresentInDCI-1-2 corresponding to the first CORESET is in an enabled state. That is, tci-PresentInDCI-1-2 is an RRC parameter corresponding to the first CORESET, and this parameter is in the (enable) state.

[0134] Optionally, in the above embodiments, the bandwidth part (BWP) of the first device is configured with P CORESERs, where P is an integer, the maximum value of P is 3, or the maximum value of P is 5, and the P CORESETs include the first CORESET.

[0135] Exemplarily, the number of CORESETs configured by the second device for the first device on a bandwidth part (BWP) ranges from 1 to 5. When the maximum value of P is 5, for multi-TRP transmission, by increasing the number of CORESETs, the degree of freedom for system optimization is provided, thereby improving the overall performance, but the implementation complexity of the first device and the second device is relatively high.

[0136] When the maximum value of P is 3, the requirements of R15 are continued to be followed, avoiding the mixed use of the PDCCH scheme based on multi-TRP transmission and the PDSCH scheme based on multi-TRP transmission when the first device receives the PDCCH, and reducing the implementation complexity of the protocol and the product.

[0137] In the above embodiments, the second device can directly configure N active TCI-States for the first CORESET through the first configuration information. Exemplarily, reference can be made to Figure 4 (Some steps can be omitted).

[0138] Figure 4 It is another flowchart for transmitting the physical downlink control channel provided by the embodiments of the present application. This embodiment includes:

[0139] 401. The first device receives the first configuration information from the second device.

[0140] Exemplarily, the second device sends the first configuration information to the first device; correspondingly, the first device receives the first configuration information. The first configuration information is carried in the RRC signaling, or the first configuration information is the RRC signaling.

[0141] When the second device is a device in scenarios such as D2D and V2X, the second device can generate the first configuration information, or the second device obtains the first configuration information from the network.

[0142] 402. The first device configures the N active TCI-States for the first CORESET according to the first configuration information.

[0143] After the first device receives the first configuration information indicating N active TCI-States, it establishes an association relationship between the first CORESET and the N active TCI-States. In one way, the first configuration information simultaneously indicates the time-frequency domain related information of the first CORESET and the N active TCI-States. After receiving the first configuration information, the first device determines the time domain resources and frequency domain resources corresponding to the first CORESET, and at the same time, determines the N active TCI-States corresponding to the first CORESET.

[0144] In another way, the second device pre-configures the first CORESET for the first device, and then configures N active TCI-States for the first CORESET through the first configuration information.

[0145] 403. The first device receives the PDCCH from the second device on the first CORESET.

[0146] For details, please refer to the description of step 301 above, which will not be elaborated here.

[0147] Adopting this solution, the second device directly configures N active TCI-States for the first device through the first configuration information, without the need to use additional signaling to activate the TCI-State, thereby reducing the signaling overhead.

[0148] Please refer to Figure 4 the embodiment. The premise of this embodiment is that before the first device receives the first configuration information from the second device, it also receives the fourth configuration information from the second device. That is to say, the above Figure 4 also includes:

[0149] 400. The first device receives the fourth configuration information from the second device.

[0150] The fourth configuration information is used to indicate that the DMRS of the PDCCH corresponds to 2 active TCI-States.

[0151] In the above embodiment, the second device can configure M TCI-States for the first CORESET through the second configuration information. Wherein, M≥N, or M>N. Exemplarily, please refer to Figure 5 .

[0152] Figure 5 is another flowchart for transmitting the physical downlink control channel provided by the embodiments of the present application. This embodiment includes:

[0153] 501. The first device receives the second configuration information from the second device.

[0154] Exemplarily, the second device sends second configuration information to the first device; correspondingly, the first device receives the second configuration information. The second configuration information is carried in the RRC signaling, or the first configuration information is the RRC signaling.

[0155] 502. The first device configures M TCI-States for the first CORESET according to the second configuration information, where M≥N and M is an integer.

[0156] After the first device configures M TCI-States, it determines the above-mentioned N active TCI-States from the M TCI-States.

[0157] 503. The first device receives PDCCH from the second device on the first CORESET.

[0158] For details, refer to the description of step 301 above, which will not be elaborated here.

[0159] Adopting this solution, the second device directly configures M TCI-States for the first device, and then the second device indicates N active TCI-States among the M TCI-States through other signaling, or the first device determines the above-mentioned N TCI-States from the M TCI-States according to the location, etc., with high flexibility.

[0160] Optionally, in the above Figure 5 embodiment, after the first device receives the second configuration information from the second device, it also receives a first Medium Access Control Control Element (MAC Control Element, MACCE) signaling from the second device, and the first MAC CE signaling is used to indicate the N active TCI-States among the M TCI-States. The first MAC CE carries activation TCI-State indication information for indicating the N active TCI-States. The activation TCI-State indication information can be the identifier (ID) of each TCI-State in the N active TCI-States, or a sequence, and the sequence is used to represent which TCI-States among the M TCI-States are the activation TCI-States corresponding to the low CORESET.

[0161] The above first MAC CE is at least divided into the following two cases: (taking N = 2 as an example) In one case, the first MACCE includes one or more of the following information:

[0162] A. Serving cell indication information, which is used to indicate the serving cell corresponding to the first MAC CE signaling. For example, it is 5 bits. If the serving cell belongs to a cell set and the cell set supports simultaneous update of TCI-State, the first MAC CE signaling is applicable to all cells in the cell set.

[0163] B. CORESET indication information, which is used to indicate the CORESET corresponding to the first MAC CE signaling. Optionally, the CORESET indication information is, for example, 4 bits.

[0164] C. First indication information, which is used to indicate one activated TCI-State among the N activated TCI-States. Optionally, the first indication information is, for example, 7 bits.

[0165] D. Second indication information, which is used to indicate another activated TCI-State among the N activated TCI-States. Optionally, the second indication information is, for example, 7 bits.

[0166] Optionally, the first indication information is further used to indicate whether the second indication information is included in the first MAC CE signaling. In this way, the first device can determine whether there is the second indication information according to the content of the first indication information.

[0167] In the above embodiment, taking N = 2 as an example, the activated TCI-State indication information includes the first indication information and the second indication information, and the 2 activated TCI-States are indicated by the first indication information and the second indication information. In addition, the N activated TCI-States can also be implemented by a bitmap in the first MAC CE signaling. For example, when the value of 1 bit in the bitmap is 1, it indicates the activation of the corresponding TCI-State. Assuming M = 5 and N = 2, and the 3rd and 4th TCI-States are the activated TCI-States corresponding to the first CORESET, the first MAC CE carries the sequence "00110". The first device can determine the N activated TCI-States from the M TCI-States according to the sequence "00110". This method can be used not only in this embodiment but also similarly in other various embodiments in this article, and will not be elaborated further hereinafter.

[0168] The above Figure 5In an embodiment, if the second device sends fourth configuration information to the first device before sending the first MAC CE to the first device, the first MAC CE signaling includes second indication information; if the second device does not send fourth configuration information to the first device before sending the first MAC CE to the first device, the first MAC CE does not include the second indication information. That is to say, if the second device sends fourth configuration information to the first device, the first MAC CE signaling indicates 2 active TCI-States for the first CORESET; if the second device does not send fourth configuration information to the first device, the first MAC CE signaling indicates 1 active TCI-State for the first CORESET.

[0169] In another case, the first MAC CE includes one or more of the following information:

[0170] A. Serving cell indication information, which is used to indicate the serving cell corresponding to the first MAC CE signaling. For example, it is 5 bits. If the serving cell belongs to a cell set and the cell set supports simultaneous update of TCI-State, the first MAC CE signaling is applicable to all cells in the cell set.

[0171] B. CORESET indication information, which is used to indicate the first CORESET corresponding to the first MAC CE signaling. Optionally, the first CORESET indication information is, for example, 4 bits.

[0172] C. First indication information, which is used to indicate one of the N active TCI-States. Optionally, the first indication information is, for example, 7 bits.

[0173] D. Second indication information, which is used to indicate another one of the N active TCI-States. Optionally, the second indication information is, for example, 7 bits.

[0174] E. Flag, and the Flag is used to indicate whether the second indication information is included in the first MAC CE signaling.

[0175] Optionally, in the above embodiment, the first MAC CE signaling is further used to indicate the active TCI-State of the second CORESET, and the first MAC CE signaling further includes one or more of the following information:

[0176] F. CORESET quantity, which is used to indicate the quantity of the second CORESET and the first CORESET. That is to say, the first MAC CE signaling indicates the active TCI-States of multiple CORESETS.

[0177] G. CORESET indication information for indicating the at least one second CORESET. For example, the CORESET indication information includes the identifiers of each CORESET in one or more second CORESETs. Each CORESET ID is, for example, 4 bits. When the number of second CORESETs is relatively small, the number of bits occupied is relatively small. Again, the CORESET indication information is represented by a bitmap to indicate one or more second CORESETs. When the number of second CORESETs is relatively large, the number of bits occupied for indicating the CORESET by using the bitmap is relatively small.

[0178] Optionally, the bitmap is, for example, 16 bits. In this solution, since the size of the bitmap is fixed, the protocol design and product implementation are simple.

[0179] Optionally, when the number of CORESETs configured in the serving cell is less than or equal to 8, the bitmap is 8 bits. When the number of CORESETs configured in the serving cell is greater than 8, the bitmap is 16 bits. Among them, the configured CORESETs include CORESET 0, and CORESET 0 is the CORESET with the identifier 0. The configured CORESETs include the above-mentioned first CORESET and second CORESET. In this way, the first device can determine the size of the bitmap according to the number of configured CORESETs, and can reduce the signaling overhead of the first MAC CE.

[0180] Optionally, when the number of CORESETs configured in the serving cell is less than or equal to 8, the bitmap is 8 bits. When the number of second CORESETs configured in the serving cell is greater than 8, the bitmap is 16 bits. Among them, the configured CORESETs do not include CORESET 0. In this way, the first device can determine the number of second CORESETs according to the number of configured CORESETs, and can reduce the signaling overhead of the first MAC CE.

[0181] H. The third indication information of each second CORESET for indicating an active TCIState of the second CORESET, for example, 7 bits;

[0182] I. The fourth indication information of each second CORESET for indicating another active TCI State of the second CORESET, for example, 7 bits.

[0183] J. The fifth indication information for indicating whether the fourth indication information exists in the first MAC CE.

[0184] Optionally, in the above embodiments, the second device may configure K TCI-State groups for the first CORESET through the third configuration information.

[0185] Exemplarily, before receiving the PDCCH from the second device on the first CORESET, the first device further receives the third configuration information from the second device, and then configures K TCI-State groups for the first CORESET according to the third configuration information. Each of one or more TCI-State groups in the K TCI-State groups corresponds to the N active TCI-States, where K≥1 and is an integer.

[0186] Exemplarily, the second device sends the third configuration information to the first device; correspondingly, the first device receives the third configuration information. The third configuration information is carried in the RRC signaling, or the third configuration information is the RRC signaling. After receiving the third configuration information, the first device configures K TCI-State groups for the first CORESET. In the K TCI-State groups, each of one or more TCI-State groups corresponds to N active TCI-States. In this solution, configuring the TCI-State groups through the RRC signaling can reduce the MAC CE signaling overhead.

[0187] When the first device receives the third configuration information, the first device can determine the N active TCI-States through at least two methods.

[0188] In one method, in the above embodiments, the third configuration information indicates an N TCI-State list, and the TCI-States at the corresponding positions of the N TCI-State lists form the TCI-State group.

[0189] For example, the third configuration information indicates 2 TCI-State lists, and the 2 TCI-State lists respectively indicate X1 TCI-States and X2 TCI-States, where X2<X1. Then, the first X2 TCI-States in the first TCI-State list and the first X2 TCI-States in the second TCI-State list correspond one by one to form a group.

[0190] Examples of the third configuration information are as follows: Starting from the existing RRC parameters, corresponding modifications are made, and a new field such as TCI-StatePDCCH-ToAddlist2 is added. The name of the new field can be other names, and the embodiments of the present application do not limit this. The relevant protocols are as follows:

[0191]

[0192] In another way, in the above embodiments, the first device further receives a second MAC CE signaling from the second device, where the second MAC CE signaling is used to indicate a first TCI-State group among the K TCI-State groups, and the first TCI-State group corresponds to the N active TCI-States.

[0193] In this way, the second device indicates, by using the second MAC CE signaling, 1 TCI-State group corresponding to the first CORESET, that is, the first TCI-State group. The TCI-State group corresponds to the above-mentioned N active TCI-States. Optionally, the second MAC CE signaling may further indicate 1 active TCI-State corresponding to the first CORESET. After receiving the second MAC CE signaling, the first device determines the position of the 1 active TCI-State in the first TCI-State list, and then determines the second active TCI-State list from the second TCI-State list according to this position.

[0194] Optionally, in the above embodiments, when the PDCCH is used to schedule the PDSCH, if the scheduling interval is greater than a first threshold and the PDSCH does not carry TCI indication information, the first device receives the PDSCH according to the N active TCI-States.

[0195] Exemplarily, assume N = 2. If the scheduling offset is greater than the first threshold and the PDSCH does not carry TCI indication information, the first device receives the PDSCH according to the 2 active TCI states corresponding to the first CORESET. In this solution, since it is necessary to cache data according to two QCL assumptions, the complexity is relatively high, but the receiving performance of the first device can be improved. Among them, the first threshold is determined by the first device according to the reported capability information; or, the first threshold is network-configured; or, the first threshold is a predetermined value.

[0196] Optionally, in the above embodiments, when the PDCCH is used to schedule the PDSCH, if the scheduling interval is greater than the first threshold and the PDSCH does not carry TCI indication information, the first device receives the PDSCH according to the first TCI-State among the N active TCI-States. In this solution, since the first device only needs to cache data according to 1 QCL assumption, the implementation complexity of the first device can be reduced.

[0197] Optionally, the first device determines a first TCI-State according to the identifiers of the TCI-States in the N active TCI-States. For example, the first TCI-State is the TCI-State with the largest TCI-State ID among the N active TCI-States; alternatively, the first TCI-State is the TCI-State with the smallest TCI-State ID among the N active TCI-States.

[0198] Optionally, the first device may also determine the first TCI-State according to the positions of the TCI-States in the N active TCI-States in the first MAC CE signaling. For example, the first TCI-State is the TCI-State with a relatively forward position among the N active TCI-States.

[0199] Optionally, the first device may also determine the first TCI-State according to the positions of the TCI-States in the N active TCI-States in the first configuration information. For example, the first TCI-State is the TCI-State with a relatively forward position among the N active TCI-States.

[0200] Optionally, in the above embodiments, when the PDCCH is used to schedule the PDSCH, the scheduling offset is greater than or greater than or equal to a first threshold.

[0201] Optionally, in the above embodiments, when the PDCCH is used to schedule the PDSCH, if the scheduling interval is less than the first threshold, and the first device needs to determine the QCL assumption related to PDSCH reception according to the first CORESET, the first device receives the PDSCH according to the N active TCI-States. In this solution, since it is necessary to cache data according to two QCL assumptions, the complexity is relatively high, but the reception performance of the first device can be improved.

[0202] Optionally, in the above embodiments, when the PDCCH is used to schedule the PDSCH, if the scheduling interval is less than the first threshold and the first device needs to determine the QCL assumption related to PDSCH reception according to the first CORESET, the first device schedules the PDSCH according to the first TCI-State among the N active TCI-States. In this solution, since the first device only needs to cache data according to one QCL assumption, the implementation complexity of the first device can be reduced.

[0203] Optionally, the first device determines the first TCI-State according to the identifiers of the TCI-States in the N active TCI-States. For example, the first TCI-State is the TCI-State with the largest TCI-State ID among the N active TCI-States; or, the first TCI-State is the TCI-State with the smallest TCI-State ID among the N active TCI-States.

[0204] Optionally, the first device may also determine the first TCI-State according to the positions of the TCI-States in the N active TCI-States in the first MAC CE signaling. For example, the first TCI-State is the TCI-State with a relatively forward position among the N active TCI-States.

[0205] Optionally, the first device may also determine the first TCI-State according to the positions of the TCI-States in the N active TCI-States in the first configuration information. For example, the first TCI-State is the TCI-State with a relatively forward position among the N active TCI-States.

[0206] In the above embodiments, the first device receives the fourth configuration information from the second device, and the fourth configuration information is used to indicate that the DMRS of at least some of the PDCCHs received by the first device corresponds to N active TCI-States. For example, the DMRS of some PDCCHs corresponds to N active TCI-States, the DMRS of some PDCCHs corresponds to one active TCI-State; or, the DMRS of all PDCCHs corresponds to N active TCI-States. In this solution, the transmission mode of the PDCCH is configured through explicit signaling, avoiding the first device implicitly determining the transmission mode of the PDCCH through complex rules, which can reduce the difficulty of protocol design and the implementation complexity of both the network side and the terminal side.

[0207] Optionally, in the above embodiments, the fourth configuration information and the first configuration information are carried in the same signaling, or the fourth configuration information and the first configuration information are the same signaling, so as to achieve the purpose of saving signaling overhead.

[0208] Optionally, in the above embodiments, the fourth configuration information and the second configuration information are carried in the same signaling, or the fourth configuration information and the second configuration information are the same signaling, so as to achieve the purpose of saving signaling overhead.

[0209] Optionally, in the above embodiments, the fourth configuration information and the third configuration information are carried in the same signaling, or the fourth configuration information and the third configuration information are the same signaling, so as to achieve the purpose of saving signaling overhead.

[0210] Optionally, before the second device sends a PDCCH on the first CORESET, it sends the fourth configuration information to the first device. Correspondingly, before the first device receives the PDCCH from the second device on the first CORESET, it receives the fourth configuration information from the second device.

[0211] Optionally, in the above embodiments, the first device also sends capability information to the second device, and the capability information is used to indicate that the first device supports receiving a PDCCH corresponding to N active TCI-States. That is to say, the capability information is used to indicate the reception of the following PDCCH by the first device: the DMRS of a PDCCH corresponds to N active TCI-States; or, the first CORESET corresponding to the PDCCH corresponds to N active TCI-States.

[0212] Adopting this solution, each first device independently reports its own capability information to the second device, and configures the transmission mode of the PDCCH through explicit signaling, avoiding the first device implicitly determining the transmission mode of the PDCCH through complex rules, which can reduce the difficulty of protocol design and the implementation complexity of both the network side and the terminal side.

[0213] Optionally, in the above embodiments, the capability information is carried in the UE capability signaling of the first device.

[0214] Optionally, in the above embodiments, the capability information is carried in a radio resource control (RRC) signaling or a media access control control element (MAC CE) signaling.

[0215] Optionally, in the above embodiments, when the first device sends the capability information to the second device, it sends the capability information to the second device according to the frequency band (per band).

[0216] Exemplarily, the first device reports the corresponding capability information according to the frequency band, that is, the first device independently reports the corresponding capability information on different frequency bands, and the capability information corresponding to each frequency band (per band) can be different. For example, when the first device reports the above capability information on a certain or certain frequency bands, it means that the first device supports receiving a PDCCH corresponding to N active TCI-States on these frequency bands; again, for example, when the first device does not report the above capability information on a certain or certain frequency bands, it means that the first device does not support receiving a PDCCH corresponding to N active TCI-States on these frequency bands.

[0217] In this solution, the first device independently reports its capability information on different frequency bands, giving the first device greater freedom.

[0218] Optionally, in the above embodiment, when the first device sends the capability information to the second device, the first device sends the capability information to the second device according to a band combination (per band combination).

[0219] Exemplarily, the first device reports the corresponding capability information according to a band combination (band combination), that is, the first device independently reports the corresponding capability information for different band combinations, and the capability information corresponding to different band combinations can be different. For example, if the first device does not support receiving the PDCCH corresponding to N active TCI-States under a certain Carrier Aggregation (CA), the first device does not report the above capability information for this CA. Another example is that if the first device supports receiving the PDCCH corresponding to N active TCI-States under a certain CA, the first device reports the above capability information for this CA.

[0220] Optionally, in the above embodiment, when the first device sends the capability information to the second device, the first device sends the capability information to the second device according to the frequency bands in the band combination (per band per band combination).

[0221] Exemplarily, the first device reports the corresponding capability information according to the frequency bands in the band combination (band combination), that is, the first device independently reports the corresponding capability information for different frequency bands in different band combinations, and the capability information corresponding to different band combinations can be different. For example, a band combination includes frequency bands 1 - 3. The first device reports the above capability information for frequency bands 1 and 2 in this band combination, indicating that the first device supports receiving the PDCCH corresponding to N active TCI-States on frequency bands 1 and 2, and does not support receiving the PDCCH corresponding to N active TCI-States on frequency band 3.

[0222] Next, taking N = 2 as an example, the above method for transmitting the physical downlink control channel will be described in detail.

[0223] Figure 6 This is a flowchart of transmitting the physical downlink control channel provided by an embodiment of the present application. In this embodiment, the second device configures 2 active TCI-States for the first CORESET through the first configuration information. This embodiment includes:

[0224] 601. The first device sends capability information to the second device.

[0225] Exemplarily, after the first device accesses the network and enters the RRC connection state (RRC connect mode), it sends capability information to the second device through terminal capability signaling such as RRC signaling. This capability information indicates that the first device is capable of receiving a PDCCH, and the DMRS of this PDCCH corresponds to 2 active TCI-States. Alternatively, the first CORESET of this PDCCH corresponds to 2 active TCI-States. That is to say, the first device can obtain the corresponding QCLassumption (quasi-co-location assumption) according to the two active TCI-States to receive the DMRS and PDCCH of the PDCCH.

[0226] Optionally, the first device can report the above-mentioned capability information independently for each frequency band, that is, the first device supports this feature on some frequency bands and does not support this feature on some frequency bands.

[0227] Optionally, the first device can report the above-mentioned capability information for different frequency band combinations, that is, for some frequency band combinations, the first device supports this feature, and for some frequency band combinations, the first device does not support this feature.

[0228] Optionally, the first device can also report the above-mentioned capability information for different frequency bands in a frequency band combination. That is, for a frequency band combination, the first device supports this feature on one or some of the frequency bands in this frequency band combination, and does not support this feature on other frequency bands in this frequency band combination.

[0229] The above Figure 6 also includes:

[0230] 602. The first device receives fourth configuration information from the second device.

[0231] Exemplarily, step 602 can be executed before or after step 601. The fourth configuration information is used to indicate that the DMRS of a PDCCH corresponds to 2 active TCI-States. Alternatively, the fourth configuration information is used to indicate that the CORESET corresponding to a PDCCH corresponds to 2 active TCI-States. That is to say, the fourth configuration information is used to tell the first device to enter a new PDCCH transmission scheme.

[0232] 603. The second device sends first configuration information to the first device.

[0233] After the first device receives the fourth configuration information, if the second device sends the first configuration information to the first device, the first device receives the first configuration information and configures the first CORESET and other CORESETs according to the first configuration information. Among them, the first CORESET corresponds to 2 active TCI-States.

[0234] When the first device receives the PDCCH from the second device on the first CORESET, the 2 TCI-States of the first CORESET are both active. That is to say, if a PDCCH is transmitted in the first CORESET, the first terminal device receives the PDCCH according to the QCL assumptions corresponding to the 2 active TCI-States.

[0235] Optionally, the two active TCI-States are configured with the same QCL type. For example, both of the two active TCI-States are configured with QCL-TypeA, or both are configured with QCL-TypeA and QCL-TypeD, or both are configured with QCL-TypeD.

[0236] Optionally, the above PDCCH corresponds to a UE-specific search space.

[0237] Optionally, the second device sends the PDCCH to the first device from 2 TRPs on the same time-domain resource and frequency-domain resource. The above two active TCI-states respectively correspond to the transmissions on the 2 TRPs.

[0238] Optionally, the RRC parameter coresetPoolIndex corresponding to the above first CORESET is not configured.

[0239] Optionally, the number of bits in the tci indication field in the above PDCCH is greater than 0, such as 3 bits.

[0240] Optionally, the RRC parameter tci-PresentInDCI corresponding to the first CORESET is configured as enabled.

[0241] Optionally, the RRC parameter tci-PresentInDCI-1-2 corresponding to the first CORESET is configured as enabled.

[0242] Figure 7 It is another flowchart for transmitting the physical downlink control channel provided by the embodiments of the present application. In this embodiment, the second device configures M TCI-States for the first CORESET through the second configuration information. Among them, M≥N; or, M>N. This embodiment includes:

[0243] 701. The first device sends capability information to the second device.

[0244] Specifically, refer to the description of step 601 above. Figure 6 It will not be elaborated here.

[0245] 702. The first device receives second configuration information from the second device.

[0246] After receiving the second configuration information, the second device determines 2 active TCI-States from M TCI-States. For example, randomly select 2 active TCI-States.

[0247] For another example, after step 702, the second device sends a first MAC CE to the first device, and this first MAC CE signaling is used to indicate 2 active TCI-States corresponding to the first CORESET.

[0248] An example of the first MAC CE signaling can be found in Figure 8 and Figure 9 .

[0249] Figure 8 is a schematic diagram of the first MAC CE signaling in the method for transmitting the physical downlink control channel provided by the embodiments of the present application. Please refer to Figure 8 , the first MAC CE signaling carries serving cell indication information, a CORESET indication information, a first indication information, a second indication information, and a reserved bit (Reserve, R). Among them, the serving cell indication information is, for example, the Serving Cell ID in the figure, for example, 5 bits; the CORESET indication information is, for example, the CORESET ID, for example, 4 bits, and these 4 bits include 3 bits in the first row (Oct1) and 1 bit in the second row (Oct2). The first indication information is, for example, the TCI State ID in the second row (Oct2), and the second indication information is, for example, the TCI State ID in the third row (Oct3). The first indication information and the second indication information are each 7 bits. Each piece of information carried by the first MAC CE signaling is located in a different position in the first MAC CE signaling, and these positions can be interchanged. For example, the TCI State ID and R in the third row (Otc3) can be interchanged.

[0250] Optionally, the first device determines whether there is a second indication information in the third row according to the fourth configuration information. If the second device sends the fourth configuration information to the first device, there is the second indication information in the third row of the first MAC CE signaling; if the second device does not send the fourth configuration information to the first device, there is no second indication information in the third row of the first MAC CE signaling. With this solution, the first device determines the size of the first MAC CE according to the fourth configuration information, knows the format of the first MAC CE signaling in advance, and thus reduces the implementation complexity of the first device.

[0251] In addition, the first device can also determine whether there is a second indication information according to the first indication information in the second row (Oct2). For example, if Figure 8 the TCI-State ID indicated by the first indication information in the second row (Oct2) in Figure 8 is greater than or equal to 64, the second indication information in the third row of the first MAC CE signaling exists. If

[0252] Figure 9 the TCI sTate ID indicated by the first indication information in the second row (Oct2) in Figure 9 is less than 64, the second indication information in the third row of the first MAC CE signaling does not exist. When the first device determines that the second indication information in the third row of the first MAC CE signaling exists, a difference is obtained by subtracting 64 from the value corresponding to the TCI-State ID indicated by the first indication information in the second row (Oct2), and the TCI-State indicated by the second indication information is determined according to the difference. With this solution, the first device can determine whether there is a second indication information according to the first MAC CE signaling, without the second device sending the fourth configuration information to the first device, saving signaling overhead.

[0252] Figure 9 is another schematic diagram of the first MAC CE signaling in the method for transmitting a physical downlink control channel provided by the embodiments of the present application. Please refer to Figure 9, the first MAC CE signaling carries serving cell indication information, a CORESET indication information, a first indication information, a second indication information, and a Flag. Among them, the serving cell indication information is, for example, the Serving CellID in the figure, and the CORESET indication information is, for example, the CORESET ID, for example, 5 bits; the CORESET indication information is, for example, the CORESETID, for example, 4 bits, and these 4 bits include 3 bits in the first row (Oct1) and 1 bit in the second row (Oct2). The first indication information is, for example, the TCI State ID in the second row (Oct2), and the second indication information is, for example, the TCI State ID in the third row (Oct3). The first indication information and the second indication information are each 7 bits. Each piece of information carried by the first MAC CE signaling is located at different positions in the first MAC CE signaling, and these positions can be interchanged. For example, the serving cell indication information and the CORESET indication information in the first row (Otc1) can be interchanged.

[0253] The first device determines whether there is a second indication information according to the Flag in the third row (Oct3). For example, when the Flag is 1, it means that there is a second indication information in the third row of the first MAC CE signaling; when the Flag is 0, it means that there is no second indication information in the third row of the first MAC CE signaling. Another example is that when the Flag is 1, it means that there is no second indication information in the third row of the first MAC CE signaling; when the Flag is 0, it means that there is a second indication information in the third row of the first MAC CE signaling.

[0254] Adopting this solution, the Flag is used to indicate whether there is a second indication information in the third row of the first MAC CE signaling, so that the format of the first MAC CE can also support the traditional case of only activating one TCI-State.

[0255] Optionally, in the above embodiment, the first MAC CE signaling is further used to indicate the activated TCI-State of the second CORESET. At this time, an example of the first MAC CE is Figure 10 and Figure 11 as shown.

[0256] Figure 10 is another schematic diagram of the first MAC CE signaling in the method for transmitting a physical downlink control channel provided by the embodiments of the present application. Please refer to Figure 10, the first MAC CE signaling carries serving cell indication information, the number of CORESETs, and one or more CORESET indication information, and the indication information of the activated TCI-State of each CORESET in the one or more CORESETs. Each piece of information carried by the first MAC CE signaling is located at different positions in the first MAC CE signaling, and these positions can be interchanged. For example, the Service Cell ID and the number of CORESETs in the first row (Otc1) can be interchanged.

[0257] Among them, the serving cell indication information is, for example, the Service Cell ID in the figure, which is used to indicate the serving cell corresponding to the first MAC CE signaling. For example, it is 5 bits. If the serving cell belongs to a cell set and the cell set supports simultaneous update of the TCI-State, the first MAC CE signaling is applicable to all cells in the cell set.

[0258] The number of CORESETs, such as the number of CORESETs (F) in the figure, indicates how many activated TCI-States of CORESETs are indicated by the first MAC CE signaling. Figure 10 In, the number of CORESETs is, for example, Z, and Z is an even number.

[0259] One or more CORESET indication information, such as the CORESET ID in the figure, is used to indicate which CORESET or which CORESETs the first MAC CE signaling is for. Each CORESET ID indicated by the CORESET indication information is, for example, 4 bits. Figure 10 Taking Z as an even number as an example, a total of Z pieces of CORESET ID information are indicated. Among them, CORESET ID1 (B) represents the first CORESET, and CORESET ID2 (G)-CORESET IDZ (G) represent the second CORESET.

[0260] For each CORESET, taking CORESETID1 as an example, the activated TCI-State of CORESET ID1 is TCI-StateID1,1 and TCI-State ID1,2. Each activated TCI-State ID of CORESETID1 is, for example, 7 bits.

[0261] Figure 10In it, R represents reserved bits. The C1-Cz flags indicate whether there is a second active TCI-State for each CORESET among CORESET ID 1-CORESET ID Z. Taking CORESET ID 2 as an example, if C2 is 1, it means there is a second active TCI-State for CORESET ID 2. If C2 is 0, it means there is no second active TCI-State for CORESET ID 2. Adopting this scheme can save bits and reduce the first MAC CE signaling overhead.

[0262] In addition, if C2 is 0, it can also indicate that the bits corresponding to TCI-State ID1,2 are not applicable, thus avoiding the change of the size of the first MAC CE signaling caused by the existence or non-existence of some fields, and reducing the product implementation complexity.

[0263] Figure 11 It is another schematic diagram of the first MAC CE signaling in the method for transmitting a physical downlink control channel provided by an embodiment of the present application. Please refer to Figure 11 , the first MAC CE signaling carries serving cell indication information, one or more CORESET indication information, and indication information of the active TCI-State of each CORESET among the one or more CORESETs. Each piece of information carried by the first MAC CE signaling is located at different positions in the first MAC CE signaling, and these positions can be interchanged. For example, the Service Cell ID and the reserved bit 1 (reserve1, R1) in the first row (Otc1) can be interchanged.

[0264] Among them, the serving cell indication information is, for example, the Service Cell ID in the figure, which is used to indicate the serving cell corresponding to the first MAC CE signaling. For example, it is 5 bits. If the serving cell belongs to a cell set and the cell set supports simultaneous update of the TCI-State, the first MAC CE signaling is applicable to all cells in the cell set.

[0265] One or more CORESET indication information is used to indicate which CORESET or which CORESETs the first MAC CE signaling is for. In Figure 10 , it is indicated by a 16-bit bitmap, and this 16-bit bitmap is shown as X1-X16 in the second and third rows in the figure. Assuming that among the 16 bits, X1, X3, and X12 are 1 and the rest are 0, it means that the first MAC CE signaling indicates the active TCI-States of 3 CORESETs.

[0266] In addition, the bitmap can also be 8 bits or the like. When the value of a certain bit is 1, it indicates that the first MAC CE will activate the TCI-State of the CORESET corresponding to this bit. Optionally, the bits in the bitmap correspond to the corresponding CORESET ID according to their positions.

[0267] For each CORESET, taking CORESET ID1 as an example, the activated TCI-States of CORESET ID1 are TCI-StateID1,1 and TCI-State ID1,2. Each activated TCI-State ID of CORESETID1 is, for example, 7 bits.

[0268] Figure 11 In, R1 and R both represent reserved bit positions. R1 is, for example, 3 bits, and one R is 1 bit. Figure 11 In, R1 and / or R can also be used for other purposes (the reserved bits in other embodiments can also be used for other purposes, which will not be elaborated one by one). C1-Cz indicate whether there is a second activated TCI-State for each CORESET among CORESET ID 1-CORESET ID Z. Taking CORESET ID 2 as an example, if C2 is 1, it indicates that there is a second activated TCI-State for CORESET ID 2. If C2 is 0, it indicates that there is no second activated TCI-State for CORESET ID 2. Adopting this solution can save bits and reduce the signaling overhead of the first MAC CE.

[0269] In addition, if C2 is 0, it can also indicate that the bit corresponding to TCI-State ID1,2 is not applicable, thereby avoiding the change in the size of the first MAC CE signaling caused by the presence or absence of some fields, and reducing the product implementation complexity.

[0270] Optionally, after the above step 701, the first device also receives fourth configuration information from the second device.

[0271] Optionally, the two activated TCI-States are configured with the same QCL type. For example, both of the two activated TCI-States are configured with QCL-TypeA, or both are configured with QCL-TypeA and QCL-TypeD, or both are configured with QCL-TypeD.

[0272] Optionally, the above PDCCH corresponds to a UE-specific search space.

[0273] Optionally, the second device sends a PDCCH to the first device from two TRPs on the same time-domain resources and frequency-domain resources. The above two activated TCI-states respectively correspond to the transmissions on the two TRPs.

[0274] Optionally, the RRC parameter coresetPoolIndex corresponding to the above first CORESET is not configured.

[0275] Optionally, the number of bits in the tci indication field in the above PDCCH is greater than 0, for example, 3 bits.

[0276] Optionally, the RRC parameter tci-PresentInDCI corresponding to the first CORESET is configured as enabled.

[0277] Optionally, the RRC parameter tci-PresentInDCI-1-2 corresponding to the first CORESET is configured as enabled.

[0278] Figure 12 It is another flowchart for transmitting a physical downlink control channel provided by an embodiment of the present application. In this embodiment, the second device configures K TCI-State groups for the first CORESET through the third configuration information, where K≥1 and is an integer. This embodiment includes:

[0279] 1201. The first device sends capability information to the second device.

[0280] For details, reference can be made to the description of step 1001 above. Figure 10 Details are not described here again.

[0281] 1202. The first device receives the third configuration information from the second device.

[0282] The third configuration information indicates N TCI-State lists. The TCI-States at the corresponding positions of the N TCI-State lists form the TCI-State group.

[0283] After receiving the third configuration information, the first device determines a TCI-State group. This TCI-State group corresponds to two activated TCI-States.

[0284] For example, the third configuration information indicates two TCI-State lists, where the two TCI-State lists respectively indicate X1 TCI-States and X2 TCI-States, and X2 < X1. Then, the first X2 TCI-States in the first TCI-State list and the first X2 TCI-States in the second TCI-State list correspond one by one to form a group. An example of the third configuration information is as follows: Starting from the existing RRC parameters, corresponding modifications are made, and a new field such as tci-StatesPDCCH-ToAddlList2 is added. The name of the new field can be other names, and the embodiments of the present application do not limit this.

[0285] Again, the first device also receives a second MAC CE signaling from the second device, and the second MAC CE signaling is used to indicate a first TCI-State group among the K TCI-State groups, and the first TCI-State group corresponds to the N active TCI-States. That is to say, the second device indicates, through the second MAC CE signaling, one TCI-State group corresponding to the first CORESET, that is, the first TCI-State group. The TCI-State group corresponds to the above-mentioned N active TCI-States. Optionally, the second MAC CE signaling may also indicate one active TCI-State corresponding to the first CORESET. After receiving the second MAC CE signaling, the first device determines the position of the one active TCI-State in the first TCI-State list, and then determines the second active TCI-State list from the second TCI-State list according to this position.

[0286] Optionally, in the above embodiment, when the first device receives a PDCCH from the second device on the first CORESET, it receives the PDCCH according to the QCL assumptions corresponding to the two active TCI-States indicated by the first MAC CE signaling.

[0287] Optionally, the two active TCI-States are configured with the same QCL type. For example, both of the two active TCI-States are configured with QCL-TypeA, or both are configured with QCL-TypeA and QCL-TypeD, or both are configured with QCL-TypeD.

[0288] Optionally, the above-mentioned PDCCH corresponds to a UE-specific search space.

[0289] Optionally, the second device sends a PDCCH to the first device from two TRPs on the same time-domain resources and frequency-domain resources. The above two active TCI-states respectively correspond to the transmissions on the two TRPs.

[0290] Optionally, the RRC parameter coresetPoolIndex corresponding to the above first CORESET is not configured.

[0291] Optionally, the number of bits in the tci indication field in the above PDCCH is greater than 0, for example, 3 bits.

[0292] Optionally, the RRC parameter tci-PresentInDCI corresponding to the first CORESET is configured to be enabled.

[0293] Optionally, the RRC parameter tci-PresentInDCI-1-2 corresponding to the first CORESET is configured to be enabled.

[0294] Figure 13 It is a schematic structural diagram of a first device provided by an embodiment of the present application. Please refer to Figure 13 , the first device 1300 provided by the embodiment of the present application includes:

[0295] A memory 1301 storing executable program code;

[0296] A processor 1302 and a transceiver 1303 coupled to the memory;

[0297] The transceiver is used to receive a physical downlink control channel PDCCH on a first control resource set CORESET. The demodulation reference signal DMRS of the PDCCH corresponds to N active transmission configuration indication states TCI-State, where N≥2 and is an integer.

[0298] Optionally, the PDCCH corresponds to a first search space, and the first search space is a specific search space USS of the first device.

[0299] Optionally, the TCI-State includes the following information:

[0300] The status identifier ID of the TCI-State, which is used to identify the status of the TCI-State;

[0301] First quasi co-location QCL information.

[0302] Optionally, the TCI-State further includes: second quasi co-location QCL information.

[0303] Optionally, the PDCCH is transmitted from different beams among a plurality of beams, and the different beams among the plurality of beams correspond to different TCI-States among the N active TCI-States;

[0304] Alternatively,

[0305] the PDCCH is transmitted from different transmit-receive points among a plurality of transmit-receive points, and the different transmit-receive points among the plurality of transmit-receive points correspond to different TCI-States among the N TCI-States.

[0306] Optionally, the N active TCI-States include a first TCI-State and a second TCI-State, and the types of quasi-co-location in the first TCI-State and the second TCI-State are the same.

[0307] Optionally, the first CORESET includes a plurality of physical resource blocks in the frequency domain and includes 1 to 3 orthogonal frequency division multiplexing (OFDM) symbols in the time domain, and the first CORESET is associated with at least one search space.

[0308] Optionally, the control resource set pool index coresetPoolIndex corresponding to the first CORESET is not configured.

[0309] Optionally, the indication field for transmitting the transmission configuration indication (TCI) in the downlink control information (DCI) corresponding to the first CORESET is at least 1 bit.

[0310] Optionally, the transmission configuration indication information tci-PresentInDCI corresponding to the first CORESET is in the enabled state.

[0311] Optionally, the transmission configuration indication information tci-PresentInDCI-1-2 corresponding to the first CORESET is in the enabled state.

[0312] Optionally, the bandwidth part (BWP) of the first device is configured with P CORESETs, where 1 ≤ P ≤ 5 and P is an integer, and the P CORESETs include the first CORESET.

[0313] Optionally, the maximum value of P is 5; alternatively, the maximum value of P is 3.

[0314] Optionally, before receiving the PDCCH on the first CORESET, the transceiver 1303 is further configured to receive first configuration information from the second device;

[0315] The processor 1302 is further configured to configure the N active TCI-States for the first CORESET according to the first configuration information.

[0316] Optionally, before receiving the PDCCH on the first CORESET, the transceiver 1303 is further configured to receive second configuration information from the second device;

[0317] The processor 1302 is further configured to configure M TCI-States for the first CORESET according to the second configuration information, where M≥N and M is an integer.

[0318] Optionally, after receiving the second configuration information from the second device, the transceiver 1303 is further configured to receive first Media Access Control Control Element (MAC CE) signaling from the second device, where the first MAC CE signaling is used to indicate the N active TCI-States among the M TCI-States.

[0319] Optionally, the first MAC CE signaling includes one or more of the following information:

[0320] Service cell indication information, which is used to indicate the service cell corresponding to the first MAC CE signaling;

[0321] CORESET indication information, which is used to indicate the CORESET corresponding to the first MAC CE signaling;

[0322] First indication information, which is used to indicate one of the N active TCI-States;

[0323] Second indication information, which is used to indicate another one of the N active TCI-States.

[0324] Optionally, the first indication information is further used to indicate whether the second indication information is included in the first MAC CE signaling.

[0325] Optionally, the first MAC CE signaling includes one or more of the following information:

[0326] Service cell indication information, which is used to indicate the service cell corresponding to the first MAC CE signaling;

[0327] CORESET indication information, which is used to indicate the CORESET corresponding to the first MAC CE signaling;

[0328] First indication information, which is used to indicate one of the N active TCI-States;

[0329] A second indication information for indicating another active TCI-State among the N active TCI-States;

[0330] A flag, where the flag is used to indicate whether the second indication information is included in the first MAC CE signaling.

[0331] Optionally, the first MAC CE signaling is further used to indicate the active TCI-State of a second CORESET, and the first MAC CE signaling further includes one or more of the following information:

[0332] The number of CORESETs, which is used to indicate the number of the second CORESET and the first CORESET;

[0333] CORESET indication information, which is used to indicate the at least one second CORESET;

[0334] The third indication information and the fourth indication information of each second CORESET are respectively used to indicate two different active TCI States of the second CORESET;

[0335] A fifth indication information, which is used to indicate whether the fourth indication information exists in the first MAC CE.

[0336] Optionally, the CORESET indication information includes the identifiers of the CORESETs in one or more second CORESETs.

[0337] Optionally, the CORESET indication information is represented by a bitmap.

[0338] Optionally, the bitmap is 16 bits.

[0339] Optionally, when the number of CORESETs configured for the serving cell is less than or equal to 8, the bitmap is 8 bits, and when the number of CORESETs configured for the serving cell is greater than 8, the bitmap is 16 bits.

[0340] Optionally, before receiving the PDCCH on the first CORESET, the transceiver 1303 is further used to receive third configuration information from the second device;

[0341] The processor 1302 is further used to configure K TCI-State groups for the first CORESET according to the third configuration information, and each TCI-State group in one or more of the K TCI-State groups corresponds to the N active TCI-States, where K≥1 and is an integer.

[0342] Optionally, the third configuration information indicates N TCI-State lists, and the TCI-States at corresponding positions in the N TCI-State lists form the TCI-State group.

[0343] Optionally, the transceiver 1303 is further configured to receive a second MAC CE signaling from the second device, where the second MAC CE signaling is used to indicate a first TCI-State group among the K TCI-State groups, and the first TCI-State group corresponds to the N active TCI-States.

[0344] Optionally, when the PDCCH schedules the PDSCH, if the scheduling interval is greater than a first threshold and the PDSCH does not carry TCI indication information, the first device receives the PDSCH according to the N active TCI-States.

[0345] Optionally, when the PDCCH is used to schedule the PDSCH, if the scheduling interval is greater than a first threshold and the PDSCH does not carry received TCI indication information, the first device receives the PDSCH according to the first TCI-State among the N active TCI-States.

[0346] Optionally, the processor 1302 is further configured to determine the first TCI-State according to the identifiers or positions of the TCI-States in the N active TCI-States, where the position is the position of the N active TCI-States in the first MAC CE signaling; or the position is the position of the N active TCI-States in the first configuration information.

[0347] Optionally, when the PDCCH schedules the PDSCH, the scheduling interval is greater than a first threshold, or the scheduling interval is greater than or equal to a first threshold.

[0348] Optionally, when the PDCCH is used to schedule the PDSCH, if the scheduling interval is less than a first threshold and the first device needs to determine the QCL assumption related to PDSCH reception according to the first CORESET, the first device receives the PDSCH according to the N active TCI-States.

[0349] Optionally, when the PDCCH schedules the PDSCH, if the scheduling interval is less than a first threshold and the first device needs to determine the QCL assumption related to PDSCH reception according to the first CORESET, the first device schedules the PDSCH according to the first TCI-State among the N active TCI-States.

[0350] Optionally, the processor 1302 is further configured to determine the first TCI-State according to the identifiers or positions of the TCI-States in the N active TCI-States, where the position is the position of the N active TCI-States in the first MAC CE signaling; or, the position is the position of the N active TCI-States in the first configuration information.

[0351] Optionally, the transceiver 1303 is further configured to receive fourth configuration information from the second device, where the fourth configuration information is used to indicate that the DMRS of at least part of the PDCCH received by the first device corresponds to N active TCI-States.

[0352] Optionally, the fourth configuration information and the first configuration information are carried in the same signaling, or the fourth configuration information and the first configuration information are the same signaling.

[0353] Optionally, the fourth configuration information and the second configuration information are carried in the same signaling, or the fourth configuration information and the second configuration information are the same signaling.

[0354] Optionally, the fourth configuration information and the third configuration information are carried in the same signaling, or the fourth configuration information and the third configuration information are the same signaling.

[0355] Optionally, the transceiver 1303 is further configured to send capability information to the second device, where the capability information is used to indicate that the first device supports receiving PDCCH corresponding to N active TCI-States.

[0356] Optionally, the capability information is carried in the capability signaling of the first device.

[0357] Optionally, the capability information is carried in radio resource control (RRC) signaling or media access control control element (MAC CE) signaling.

[0358] Optionally, the transceiver 1303 is configured to send the capability information to the second device according to a frequency band.

[0359] Optionally, the transceiver 1303 is configured to send the capability information to the second device according to a frequency band combination.

[0360] Optionally, the transceiver 1303 is configured to send the capability information to the second device according to the frequency bands in the frequency band combination.

[0361] Figure 14 This is a schematic structural diagram of another first device provided by an embodiment of the present application. Please refer toFigure 14 , the first device 1400 provided in the embodiment of the present application includes:

[0362] A transceiver module 1401, configured to receive a physical downlink control channel PDCCH on a first control resource set CORESET, where the demodulation reference signal DMRS of the PDCCH corresponds to N active transmission configuration indication states TCI-State, and N≥2 and is an integer.

[0363] For the working principle of the first device 1400, please refer to the embodiments of the method executed by the first device above, which will not be elaborated here.

[0364] Figure 15 is a schematic structural diagram of a second device provided in an embodiment of the present application. Please refer to Figure 15 , the second device 1500 provided in the embodiment of the present application includes:

[0365] A memory 1501 storing executable program code;

[0366] A processor 1502 and a transceiver 1503 coupled to the memory 1501;

[0367] The transceiver 1503 is configured to send a physical downlink control channel PDCCH to the second device on a first control resource set CORESET, where the demodulation reference signal DMRS of the PDCCH corresponds to N active transmission configuration indication states TCI-State, and N≥2 and is an integer.

[0368] Optionally, the PDCCH corresponds to a first search space, and the first search space is a specific search space USS of the first device.

[0369] Optionally, the TCI-State includes the following information:

[0370] A status identifier ID of the TCI-State, used to identify the status of the TCI-State;

[0371] First quasi co-location QCL information.

[0372] Optionally, the TCI-State further includes: second quasi co-location QCL information.

[0373] Optionally, the PDCCH is transmitted from different beams among multiple beams, and different beams among the multiple beams correspond to different TCI-States among the N active TCI-States;

[0374] Or,

[0375] The PDCCH is transmitted from different transmission and reception points among a plurality of transmission and reception points, and different transmission and reception points among the plurality of transmission and reception points correspond to different TCI-States among the N TCI-States.

[0376] Optionally, the N active TCI-States include a first TCI-State and a second TCI-State, and the types of quasi-co-location in the first TCI-State and the second TCI-State are the same.

[0377] Optionally, the first CORESET includes a plurality of physical resource blocks in the frequency domain and includes 1 to 3 orthogonal frequency division multiplexing (OFDM) symbols in the time domain, and the first CORESET is associated with at least one search space.

[0378] Optionally, the control resource set pool index coresetPoolIndex corresponding to the first CORESET is not configured.

[0379] Optionally, the indication field for transmitting the transmission configuration indication (TCI) in the downlink control information (DCI) corresponding to the first CORESET is at least 1 bit.

[0380] Optionally, the transmission configuration indication information tci-PresentInDCI corresponding to the first CORESET is in the enabled state.

[0381] Optionally, the transmission configuration indication information tci-PresentInDCI-1-2 corresponding to the first CORESET is in the enabled state.

[0382] Optionally, the bandwidth part (BWP) of the first device is configured with P CORESETs, 1 ≤ P ≤ 5 and P is an integer, and the P CORESETs include the first CORESET.

[0383] Optionally, the maximum value of P is 5; or, the maximum value of P is 3.

[0384] Optionally, before transmitting the PDCCH on the first CORESET, the transceiver 1503 is further configured to send first configuration information to the first device, and the first configuration information is used to configure the N active TCI-States for the first CORESET.

[0385] Optionally, before transmitting the PDCCH on the first CORESET, the transceiver 1503 is further configured to send second configuration information to the first device; the second configuration information is used to configure M TCI-States for the first CORESET, where M ≥ N and M is an integer.

[0386] Optionally, after the transceiver 1503 sends the second configuration information to the first device, it is further configured to send a first Media Access Control Control Element (MAC CE) signaling to the first device, where the first MAC CE signaling is used to indicate the N active TCI-States among the M TCI-States.

[0387] Optionally, the first MAC CE signaling includes one or more of the following information:

[0388] Service cell indication information, which is used to indicate the service cell corresponding to the first MAC CE signaling;

[0389] CORESET indication information, which is used to indicate the CORESET corresponding to the first MAC CE signaling;

[0390] First indication information, which is used to indicate one active TCI-State among the N active TCI-States;

[0391] Second indication information, which is used to indicate another active TCI-State among the N active TCI-States.

[0392] Optionally, the first indication information is further used to indicate whether the second indication information is included in the first MAC CE signaling.

[0393] Optionally, the first MAC CE signaling includes one or more of the following information:

[0394] Service cell indication information, which is used to indicate the service cell corresponding to the first MAC CE signaling;

[0395] CORESET indication information, which is used to indicate the CORESET corresponding to the first MAC CE signaling;

[0396] First indication information, which is used to indicate one active TCI-State among the N active TCI-States;

[0397] Second indication information, which is used to indicate another active TCI-State among the N active TCI-States;

[0398] Flag, where the Flag is used to indicate whether the second indication information is included in the first MAC CE signaling.

[0399] Optionally, the first MAC CE signaling is further used to indicate the active TCI-State of a second CORESET, and the first MAC CE signaling further includes one or more of the following information:

[0400] The number of CORESETs, used to indicate the number of the second CORESET and the first CORESET;

[0401] CORESET indication information, used to indicate the at least one second CORESET;

[0402] The third indication information and the fourth indication information of each second CORESET are respectively used to indicate two different activated TCI States of the second CORESET;

[0403] The fifth indication information, used to indicate whether the fourth indication information exists in the first MAC CE.

[0404] Optionally, the CORESET indication information includes the identifiers of each CORESET in one or more second CORESETs.

[0405] Optionally, the CORESET indication information is represented by a bitmap.

[0406] Optionally, the bitmap is 16 bits.

[0407] Optionally, when the number of CORESETs configured for the serving cell is less than or equal to 8, the bitmap is 8 bits, and when the number of CORESETs configured for the serving cell is greater than 8, the bitmap is 16 bits.

[0408] Optionally, before the transceiver 1503 sends a PDCCH on the first CORESET, it is further used to send third configuration information to the first device, and the third configuration information is used to configure K TCI-State groups for the first CORESET, and each TCI-State group in one or more of the K TCI-State groups corresponds to the N activated TCI-States, where K≥1 and is an integer.

[0409] Optionally, the third configuration information indicates N TCI-State lists, and the TCI-States at the corresponding positions of the N TCI-State lists form the TCI-State groups.

[0410] Optionally, the transceiver 1503 is further used to send second MAC CE signaling to the second device, and the second MAC CE signaling is used to indicate the first TCI-State group among the K TCI-State groups, and the first TCI-State group corresponds to the N activated TCI-States.

[0411] Optionally, the transceiver 1503 is further configured to send fourth configuration information to the first device, where the fourth configuration information is used to indicate that at least part of the DMRS of the PDCCH received by the first device corresponds to N active TCI-States.

[0412] Optionally, the fourth configuration information and the first configuration information are carried in the same signaling, or the fourth configuration information and the first configuration information are the same signaling.

[0413] Optionally, the fourth configuration information and the second configuration information are carried in the same signaling, or the fourth configuration information and the second configuration information are the same signaling.

[0414] Optionally, the fourth configuration information and the third configuration information are carried in the same signaling, or the fourth configuration information and the third configuration information are the same signaling.

[0415] Optionally, the transceiver 1503 is further configured to receive capability information from the first device, where the capability information is used to indicate that the first device supports receiving a PDCCH corresponding to N active TCI-States.

[0416] Optionally, the capability information is carried in the capability signaling of the first device.

[0417] Optionally, the capability information is carried in a radio resource control (RRC) signaling or a media access control control element (MAC CE) signaling.

[0418] Optionally, the transceiver 1503 is configured to receive the capability information sent by the first device according to a frequency band.

[0419] Optionally, the transceiver 1503 is configured to receive the capability information sent by the first device according to a frequency band combination.

[0420] Optionally, the transceiver 1503 is configured to receive the capability information sent by the first device according to a frequency band in the frequency band combination.

[0421] Figure 16 It is a schematic structural diagram of another second device provided by an embodiment of the present application. Please refer to Figure 16 , the second device 1600 provided by the embodiment of the present application includes:

[0422] A transceiver module 1601, configured to send a physical downlink control channel (PDCCH) to a second device on a first control resource set (CORESET), where the demodulation reference signal (DMRS) of the PDCCH corresponds to N active transmission configuration indication states (TCI-States), and N≥2 and is an integer.

[0423] For the working principle of the second device 1600, please refer to the embodiments of the method executed by the first device above, which will not be elaborated here.

[0424] An embodiment of the present application also provides a computer-readable storage medium, including: computer instructions, which when running on the first device, cause the first device to execute the method applied to the first device as described above.

[0425] An embodiment of the present application also provides a computer-readable storage medium, including: computer instructions, which when running on the second device, cause the second device to execute the method applied to the second device as described above.

[0426] An embodiment of the present application also provides a computer program product, including: computer instructions, which when the computer program product runs on the first device, cause the first device to execute the method applied to the first device as described above.

[0427] An embodiment of the present application also provides a computer program product, including: computer instructions, which when the computer program product runs on the second device, cause the second device to execute the method applied to the second device as described above.

[0428] An embodiment of the present application also provides a chip, the chip is coupled to the memory in the first device, so that when the chip runs, it calls the program instructions stored in the memory, causing the first device to execute the method applied to the first device as described above.

[0429] An embodiment of the present application also provides a chip, the chip is coupled to the memory in the second device, so that when the chip runs, it calls the program instructions stored in the memory, causing the second device to execute each process applied to the second device as described above.

[0430] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)), etc.

[0431] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims, and drawings of the present application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order other than that illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or devices.

Claims

1. A method for transmitting a physical downlink control channel, characterized in that, comprising: The terminal device receives second configuration information from the network device; The terminal device configures M transmission configuration indication states (TCI-States) for a first control resource set (CORESET) according to the second configuration information; The terminal device receives a first media access control control element (MAC CE) signaling from the network device, the first MAC CE signaling is used to indicate N activated TCI-States among the M TCI-States, the N activated TCI-States are used to receive a physical downlink control channel (PDCCH), each of the N activated TCI-States includes a state identifier (ID) of the TCI-State, first quasi co-location (QCL) information and second QCL information, the state ID is used to identify the state of the TCI-State, M≥N and is an integer, N≥2 and is an integer; The terminal device receives the PDCCH from the network device on the first CORESET, and the demodulation reference signal (DMRS) of the PDCCH corresponds to the N activated TCI-States; The terminal device determines a first TCI-State from the N activated TCI-States according to the positions of the TCI-States in the N activated TCI-States, and the first TCI-State is the TCI-State with a relatively forward position among the N activated TCI-States; When the PDCCH is used to schedule a physical downlink shared channel (PDSCH), if the scheduling interval is greater than a first threshold and the PDSCH does not carry TCI indication information, the terminal device receives the PDSCH according to the first TCI-State; When the PDCCH is used to schedule the PDSCH, if the scheduling interval is less than the first threshold and the terminal device needs to determine the QCL assumption related to PDSCH reception according to the first CORESET, the terminal device receives the PDSCH according to the first TCI-State.

2. The method according to claim 1, characterized in that, The PDCCH corresponds to a first search space, and the first search space is a specific search space (USS) of the terminal device.

3. The method according to claim 1, characterized in that, The first CORESET includes a plurality of physical resource blocks in the frequency domain and includes 1-3 orthogonal frequency division multiplexing (OFDM) symbols in the time domain, and the first CORESET is associated with at least one search space.

4. The method according to claim 1, characterized in that, The control resource set pool index (coresetPoolIndex) corresponding to the first CORESET is not configured.

5. The method according to claim 1, characterized in that, The transmission configuration indication information (tci-PresentInDCI) corresponding to the first CORESET is in an enabled (enable) state.

6. The method according to claim 1, wherein, the transmission configuration indication information tci-PresentInDCI-1-2 corresponding to the first CORESET is in an enabled state.

7. The method according to claim 1, wherein, the bandwidth part BWP of the terminal device is configured with P CORESERs, 1 ≤ P ≤ 5 and P is an integer, and the P CORESETs include the first CORESET.

8. The method according to claim 1, wherein, the first MAC CE signaling includes one or more of the following information: serving cell indication information for indicating the serving cell corresponding to the first MAC CE signaling; CORESET indication information for indicating the CORESET corresponding to the first MAC CE signaling; first indication information for indicating one active TCI-State among the N active TCI-States; second indication information for indicating another active TCI-State among the N active TCI-States.

9. The method according to claim 1, wherein, further comprising: the terminal device receives fourth configuration information from the network device, and the fourth configuration information is used to indicate that the DMRS of at least part of the PDCCH received by the terminal device corresponds to N active TCI-States.

10. The method according to any one of claims 1-9, wherein, further comprising: the terminal device sends capability information to the network device, and the capability information is used to indicate that the terminal device supports receiving PDCCH corresponding to N active TCI-States.

11. The method according to claim 10, wherein, the terminal device sending the capability information to the network device includes: the terminal device sends the capability information to the network device according to the frequency band in the frequency band combination.

12. A method for transmitting a physical downlink control channel, wherein, comprising: the network device sends second configuration information to the terminal device, and the second configuration information is used to configure M transmission configuration indication states TCI-States for a first control resource set CORESET; the network device sends first media access control control element MAC CE signaling to the terminal device, and the first MAC CE signaling is used to indicate N active TCI-States among the M TCI-States, and the N active TCI-States are used to receive a physical downlink control channel PDCCH, and each TCI-State among the N active TCI-States includes a state identifier ID of the TCI-State, first quasi co-location QCL information, and second QCL information, the state ID is used to identify the state of the TCI-State, M ≥ N and M is an integer, N ≥ 2 and N is an integer; The network device sends the PDCCH to the terminal device on the first CORESET, and the demodulation reference signal DMRS of the PDCCH corresponds to the N active TCI-States; when the PDCCH is used to schedule the physical downlink shared channel PDSCH, if the scheduling interval is greater than a first threshold and the PDSCH does not carry TCI indication information, the first TCI-State among the N active TCI-States is used to receive the PDSCH; when the PDCCH is used to schedule the PDSCH, if the scheduling interval is less than the first threshold and the terminal device needs to determine the QCL assumption related to PDSCH reception according to the first CORESET, the first TCI-State among the N active TCI-States is used to receive the PDSCH; wherein, the first TCI-State is determined from the N active TCI-States according to the positions of the TCI-States in the N active TCI-States, and the first TCI-State is the TCI-State with a relatively forward position among the N active TCI-States.

13. The method according to claim 12, characterized in that, the PDCCH corresponds to a first search space, and the first search space is a specific search space USS of the terminal device.

14. The method according to claim 12, characterized in that, the first CORESET includes a plurality of physical resource blocks in the frequency domain and includes 1-3 orthogonal frequency division multiplexing OFDM symbols in the time domain, and the first CORESET is associated with at least one search space.

15. The method according to claim 12, characterized in that, the control resource set pool index coresetPoolIndex corresponding to the first CORESET is not configured.

16. The method according to claim 12, characterized in that, the transmission configuration indication information tci-PresentInDCI corresponding to the first CORESET is in an enabled state.

17. The method according to claim 12, characterized in that, the transmission configuration indication information tci-PresentInDCI-1-2 corresponding to the first CORESET is in an enabled state.

18. The method according to claim 12, characterized in that, the bandwidth part BWP of the terminal device is configured with P CORESERs, 1 ≤ P ≤ 5 and P is an integer, and the P CORESETs include the first CORESET.

19. The method according to claim 12, characterized in that, the first MAC CE signaling includes one or more of the following information: serving cell indication information for indicating the serving cell corresponding to the first MAC CE signaling; CORESET indication information for indicating the CORESET corresponding to the first MAC CE signaling; The first indication information, which is used to indicate one active TCI-State among the N active TCI-States; The second indication information, which is used to indicate another active TCI-State among the N active TCI-States.

20. The method according to claim 12, wherein, it further includes: The network device sends fourth configuration information to the terminal device, and the fourth configuration information is used to indicate that the demodulation reference signals (DMRS) of at least part of the physical downlink control channels (PDCCH) received by the terminal device correspond to N active TCI-States.

21. The method according to any one of claims 12 - 20, wherein, it further includes: The network device receives capability information from the terminal device, and the capability information is used to indicate that the terminal device supports receiving PDCCH corresponding to N active TCI-States.

22. The method according to claim 21, wherein, the network device receiving the capability information from the terminal device includes: The network device receives the capability information sent by the terminal device according to the frequency band in the frequency band combination.

23. A terminal device, wherein, it includes: A memory storing executable program code; A processor and a transceiver coupled to the memory; The transceiver is configured to receive second configuration information from a network device; The processor is configured to configure M transmission configuration indication states (TCI-States) for a first control resource set (CORESET) according to the second configuration information; The transceiver is further configured to receive a first media access control control element (MAC CE) signaling from the network device, and the first MAC CE signaling is used to indicate N active TCI-States among the M TCI-States. The N active TCI-States are used to receive a physical downlink control channel (PDCCH). Each of the N active TCI-States includes a status identifier (ID) of the TCI-State, first quasi - co - located (QCL) information, and second QCL information. The status ID is used to identify the status of the TCI-State. M≥N and is an integer, and N≥2 and is an integer; The transceiver is further configured to receive the PDCCH from the network device on the first CORESET, and the demodulation reference signal (DMRS) of the PDCCH corresponds to the N active TCI-States; The processor is further configured to determine a first TCI-State from the N active TCI-States according to the positions of the TCI-States in the N active TCI-States, and the first TCI-State is the TCI-State with a relatively forward position among the N active TCI-States; The transceiver is further configured to, when the PDCCH is used to schedule a Physical Downlink Shared Channel (PDSCH), if the scheduling interval is greater than a first threshold and the PDSCH does not carry TCI indication information, receive the PDSCH according to the first TCI-State; The transceiver is further configured to, when the PDCCH is used to schedule the PDSCH, if the scheduling interval is less than the first threshold and the terminal device needs to determine QCL assumptions related to PDSCH reception according to the first CORESET, receive the PDSCH according to the first TCI-State.

24. A network device characterized in that it includes: a transceiver module, configured to send second configuration information to a terminal device, where the second configuration information is used to configure M Transmission Configuration Indication States (TCI-States) for a first Control Resource Set (CORESET); The transceiver module is further configured to send a first Medium Access Control Control Element (MAC CE) signaling to the terminal device, where the first MAC CE signaling is used to indicate N active TCI-States among the M TCI-States, and the N active TCI-States are used to receive a Physical Downlink Control Channel (PDCCH). Each of the N active TCI-States includes a status identifier (ID) of the TCI-State, first Quasi-Co-Location (QCL) information, and second QCL information, where M≥N and is an integer, and N≥2 and is an integer; The transceiver module is further configured to send the PDCCH to the terminal device on the first CORESET, where the Demodulation Reference Signal (DMRS) of the PDCCH corresponds to the N active TCI-States; when the PDCCH is used to schedule a Physical Downlink Shared Channel (PDSCH), if the scheduling interval is greater than a first threshold and the PDSCH does not carry TCI indication information, the first TCI-State among the N active TCI-States is used to receive the PDSCH; when the PDCCH is used to schedule the PDSCH, if the scheduling interval is less than the first threshold and the terminal device needs to determine QCL assumptions related to PDSCH reception according to the first CORESET, the first TCI-State among the N active TCI-States is used to receive the PDSCH; where the first TCI-State is determined from the N active TCI-States according to the positions of the TCI-States in the N active TCI-States, and the first TCI-State is the TCI-State with a relatively forward position among the N active TCI-States.

25. A computer-readable storage medium characterized in that it includes: instructions that, when running on an electronic device, cause the electronic device to execute the method according to any one of claims 1 to 11, or the method according to any one of claims 12 to 22.

26. A computer program product Characterized in that, When the computer program product runs on an electronic device, the electronic device is caused to execute the method according to any one of claims 1 to 11, or the method according to any one of claims 12 to 22.

27. A chip, Characterized in that, The chip is coupled to a memory in an electronic device, such that when the chip runs, it calls program instructions stored in the memory to execute the method according to any one of claims 1 to 11, or the method according to any one of claims 12 to 22.

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